Showing papers on "Mineral processing published in 2014"

The geochemistry of acid mine drainage

Abstract: Mining and mineral processing generates large volumes of waste, including waste rock, mill tailings, and mineral refinery wastes. The oxidation of sulfide minerals in the materials can result in the release of acidic water containing high concentrations of dissolved metals. Recent studies have determined the mechanisms of abiotic sulfide-mineral oxidation. Within mine wastes, the oxidation of sulfide minerals is catalyzed by microorganisms. Molecular tools have been developed and applied to determine the activity and role of these organisms in sulfide-mineral-bearing systems. Novel tools have been developed for assessing the toxicity of mine-waste effluent. Dissolved constituents released by sulfide oxidation may be attenuated through the precipitation of secondary minerals, including metal sulfate, oxyhydroxide, and basic sulfate minerals. Geochemical models have been developed to provide improved predictions of the magnitude and duration of environmental concerns. Novel techniques have been developed to prevent and remediate environmental problems associated with these materials.

Geometallurgy : A tool for better resource efficiency

Abstract: Higher environmental and socio-economic demands in the exploitation of the future mineral resources require comprehensive knowledge on ore bodies even in the early stages of the mining process. Geo ...

Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose

Abstract: The invention discloses a mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose The process comprises the following steps that first ore grinding and staged treatment is carried out firstly, settled sand is retuned to be ground again, second ore grinding and staged treatment is carried out on overflow, the settled sand is returned to a system to be ground again, the overflow enters a weak magnetic-strong magnetic system, low intensity magnetic separation treatment is carried out firstly, strong magnetic separation is carried out on tailings after the low intensity magnetic separation many times after concentration and residue separation, rough concentrates obtained through the strong magnetic separation are combined with rough concentrates after the low intensity magnetic separation, three-stage ore grinding and staged treatment is carried out, the settled sand is returned to be ground again, selective flocculation desliming operating is carried out on the overflow many times, the low intensity magnetic separation is carried out on the deslimed settled sand to obtain weak magnetic concentrates, weak magnetic tailings are concentrated and enter in reverse flotation operating to obtain reverse flotation concentrates, and reverse flotation foam enters the weak magnetic-strong magnetic system for direct strong magnetic separation treatment The process has the advantages of being easy, convenient and stable to operate, high in iron ore concentrate recovery rate and grade, low in cost, small in the number of adopted agents and the like

Production method for preferably selecting lepidolite from tantalum and niobium ores

Abstract: The invention relates to the technical field of mineral processing, in particular to a production method for preferably selecting lepidolite from tantalum and niobium ores. The technological process comprises crushing, ore grinding, desliming and floation, the flotation concentrate is filtered by a high-frequency vibrating screen to obtain lepidolite concentrate and secondary lepidolite concentrate, the flotation tailings are re-elected to obtain tantalum and niobium concentrate, and the re-elected tailings are magnetically separated to obtain feldspar concentrate. The comprehensive recovery rate of lepidolite in the tantalum and niobium ores is greater than 70%, so that the economic efficiency of tantalum and niobium ores is greatly improved. The production method provided by the invention is particularly suitable for preferably selecting the lepidolite from the low-grade tantalum and niobium ores.

Neutrons for Mineral Processing – Thermo Diffractometry to Investigate Mineral Selective Magnetizing Flash Roasting

Abstract: Mineral selective magnetizing flash roasting in oxidizing atmosphere was tested successfully for the improved low intensity magnetic separation of siderite from ankerite and other gangue minerals within ore. The magnetization process was simulated with particle bed tests permeated with artificial combustion gas. The phase transition and the gas composition were measured simultaneously during temperature and time-dependent neutron diffraction experiments. The physical background of the rapid phase transition and the nature of the SO2 absorption are discussed. Apart from the scientific background, the effects on the process technique are outlined.

Mineral processing technology by utilizing grade difference of potassium feldspar

Abstract: The invention relates to a mineral processing technology by utilizing the grade difference of potassium feldspar. The mineral processing technology comprises the following steps that (1), potassium feldspar raw ore is mined and sorted in a separated mode according to the three classes of low-grade potassium feldspar ore, medium-grade potassium feldspar ore and high-grade potassium feldspar ore; (2), the mineral processing processes of crushing, washing, grinding for grading, desliming, and magnetic separation for deep iron removal are carried out on the low-grade potassium feldspar ore; (3), the mineral processing processes of crushing, washing, grinding for grading, desliming, flotation for mica removal and iron removal, flotation for separating feldspar from quartz, and magnetic separation for deep iron removal are carried out on the medium-grade potassium feldspar ore; (4), the mineral processing processes of crushing, washing, grinding for grading, desliming, magnetic separation for deep iron removal, wet superfine grinding and screening are carried out on the high-grade potassium feldspar ore. The different mineral processing technical schemes are adopted for the potassium feldspar ore of different grades, and the purposes of being free of environmental pollution, simplifying the production processes and efficiently developing and utilizing resources are achieved.

Mineral processing technology for low grade hematite ore

Abstract: The invention relates to a mineral processing technology for low grade hematite ore. The technologies of grading, ore grinding and magnetic separation are additionally set before floatation, ferromagnetic fine fraction magnetic ore concentrate can be recycled in advance in a magnetic separation mode, monomer separation is further carried out at the upper part of a coarse fraction sieve in flux-weakening ore concentrate and ferromagnetic ore concentrate through additional technologies of sieving and regrinding, the ore is returned, recycled and reselected, and tail escaping is realized in advance; by adopting the two modes, the flotation pulp handling capacity and floatation reagent consumption can be greatly reduced, the production cost is reduced, the ore concentrate quality is stabilized, and the proportion of flotation tailings in comprehensive tailings is reduced, so that the grade of comprehensive tailings is reduced to 10%-11% from 11%-14%.

Justification and development of innovative technologies for integrated processing of complex ore and mine waste

Abstract: The article presents the theoretical and experimental research findings aimed to create a basis for the development of innovative integrated processing technologies for complex ore and mine waste. It is found that introduction of nonmechanical energy treatment by an accelerated electron beam in the ore dressing circuits increases rebellious mineral processing data. The features of a flotation unit process are analyzed from the viewpoint of improvement of collecting and selecting abilities of a reagent and relationship between these abilities and molecular structure of the reagent. The authors define flotation activity of reagents and offer a flotation contact formation criterion. It is proved to be effective and promising to use magnesium- and manganese-bearing minerals for sorption purification of mine effluents in order to reduce metal loss in the wastewater discharge and to minimize damage of natural water bodies.

Beneficiation method for high-tin-content multi-metal sulfide ores

Abstract: The invention relates to a beneficiation method for high-tin-content multi-metal sulfide ores, and belongs to the technical field of ore processing engineering. The high-tin-content multi-metal sulfide ores are subjected to rod milling ore discharging and hydraulic cyclone grading to obtain overflow and setting sand, the overflow enters copper lead for mixed flotation, the setting sand is subjected to high-frequency vibration fine sieving and is graded again, and undersize products after the hydraulic cyclone overflowing and the high-frequency vibration fine sieving grading are merged into ore milling products containing 60 percent of particles with the granularity being smaller than 0.074mm, and the ore milling products enter flotation operation; the ore grinding products are subjected to flotation, magnetic separation and reselection in steps, and then, lead concentrates, copper concentrates, zinc concentrates, pyrrhotites, low-arsenic-content sulfur concentrate, high-grade tin concentrates, tin concentrates and rich-tin middlings are respectively produced. The beneficiation method provided by the invention has the advantages that the tin ores can be recovered to the maximum degree, meanwhile, the recovery of all valuable metal sulfide ores can be considered, the valuable minerals in the ores are recovered to the maximum degree, and the integral recovery and utilization rate of ore resources is improved.

Beneficiation of low grade graphite ore of eastern india by two-stage grinding and flotation

Abstract: A low grade graphite run-of-mine (r.o.m) ore from eastern India was studied for its amenability to beneficiation by flotation technique. The petrography studies indicate that the ore primarily consists of quartz and graphite with minor quantity of mica. It analyzed 89.89% ash and 8.59% fixed carbon. The ore was crushed in stages followed by primary coarse wet grinding to 212 μm (d80). Rougher flotation was carried out in Denver flotation cell to eliminate gangue as much as possible in the form of primary tailings with minimal loss of carbon. Diesel & pine oil were used as collector and frother respectively. Regrinding of rougher concentrate to150 μm (d80) was resorted to further liberate the graphite values and was followed by multi-stage cleaning. This two-stage grinding approach involving a primary coarse grinding and regrinding of rougher float followed by its multi-stage cleaning was found to yield required grade of concentrate for applications such as refractories, batteries and high temperature lubricants. This approach is supposed to retain the flake size of coarse, free and liberated graphite, if available, during primary coarse grinding and rougher flotation stage with minimal grinding energy costs as against the usual practice of single stage grinding in the case of many ores. A final concentrate of 8.97% weight recovery with 5.80% ash and 92.13% fixed carbon could be achieved.

Dressing and smelting method for high-silt content copper oxide ores

Abstract: The invention relates to a dressing and smelting method for high-silt content copper oxide ores, and belongs to the technical field of mineral processing. The method comprises the following steps of crushing and washing the high-silt content copper oxide ores to obtain silt-free coarse-grain ore pulp and silt-free fine-grain ore pulp, and grinding and floating coarse grains to obtain copper concentrates with copper grade of 12-22wt% and tailings by using the prior art; concentrating the fine-grain ore pulp, returning overflow water for washing operation, adding acids to leach base flow after the base flow is concentrated to 30-60wt%, washing filter residues after filtration (solid-liquid separation), and performing extraction and electro-deposition on cleaning fluid obtained by washing and leachate obtained by filtration to prepare electrolytic copper. The method has the characteristics of high recovery rate, low production cost, high adaptability, less environmental pollution and the like.

Flotation separation inhibitor and separation method of galena, pyrite and sphalerite

Abstract: The invention discloses a flotation separation inhibitor and separation method of galena, pyrite and sphalerite, and belongs to the technical field of mineral processing. The method includes adopting raw ores of sulfide lead-zinc mine as raw material, and adding SDSN (dimethyl dithiocarbamate : 2-(methylthio)ethylamine = 1-3:1)to serve as inhibitor of the pyrite and the sphalerite so as to perform lead and zinc sulphur flotation separation after the raw ores are grinded. Compared with an existing lead and zinc sulphur separation technology, the composite inhibitor SDSN has the advantages that selectivities of the pyrite and the sphalerite are high, inhibiting capability is high, usage is fewer, and adding is facilitated. The the pyrite and the sphalerite can be inhibited well, efficient separation of the galena and the zinc sulphur is implemented, the problems that according to the traditional lime or cyanide method, the recovery rate of associated gold, silver and other precious metals in the lead-zinc sulfide mine is low and ecological environment is seriously damaged are overcome, and an efficient and environment-friendly flotation separation method is provided for complex sulfide lead-zinc mine separation.

Mineral processing process for preparing qualified iron concentrate by adopting oolitic iron mine as raw material

Abstract: The present invention discloses a mineral processing process for preparing qualified iron concentrate by adopting oolitic iron mine as a raw material. The mineral processing process comprises: carrying out a magnetization baking treatment on a raw material oolitic iron mine, wherein the oolitic iron mine comprises at least one material selected from oolitic hematite, oolitic limonite and oolitic siderite, and the magnetization baking treatment is mainly provided for converting iron-containing minerals in the oolitic iron mine into the bake ore adopting Fe3O4 as the main component through baking at a medium temperature; carrying out an ore grinding magnetic separation treatment on the obtained bake ore to obtain high phosphorus iron concentrate; and carrying out flotation phosphorous reduction or acid leaching phosphorous reduction on the high phosphorus iron concentrate to obtain the qualified iron concentrate. The mineral processing process has characteristics of reasonable process, complete resource utilization, high product recovery rate, low process cost, good magnetization baking effect, high treatment capacity, and broad application prospect.

Spodumene ore processing method

Abstract: The invention relates to a spodumene ore processing method and belongs to the field of ore production. The spodumene ore processing method aims at solving the technical problem of providing an ore processing method for spodumene ore. The spodumene ore processing method is formed by steps of ore grinding, roughing for two times, scavenging and selecting for two times and finally the spodumene concentrate is obtained. The spodumene ore processing method has the advantages of being simple in technological process, good in used medicament selectivity, strong in collecting capability and low in medicament amount, greatly reducing processing costs and enabling obtained spodumene concentrate level to be more than 6 % and the recovery rate to be more than 85 %.

Mineral processing technology for comprehensively recycling various mineral resources from rare-earth tailings

Abstract: The invention provides a mineral processing technology for comprehensively recycling various mineral resources from rare-earth tailings. The mineral processing technology includes comprehensively recycling rear-earth ore concentrate, iron core concentrate, sulfur concentrate, niobium concentrate and scandium concentrate in the tailings of multi-metal mutualistic ore-deposit processing rare earth containing rare earth, iron, sulfur, niobium, fluorite and scandium, preferably, recycling rare-earth ore concentration; adopting bulk floatation to group and separate buoyant minerals, iron, niobium and silicate minerals; adopting a sulfur and iron processing-reprocessing-secondary sulfur and iron processing technology to realize sand setting of the bulk floatation, wherein early tailing discarding is realized in the reprocessing, floatation and separation of ferroniobium is finally realized, and iron, sulfur and niobium ore concentrates are obtained; gaining fluorite ore concentrate by fine grinding and floatation of mixed foam; gaining the scandium concentrate by strong-magnetic separation of niobium tailings. The mineral processing technology is capable of comprehensively recycling the resources in the tailings to the great extent, comprehensive utilization rate of mines is increased, tailings emission load is reduced, and the mineral processing technology has good economic and social benefits.

A new method to quantify mineral textures for geometallurgy

Abstract: A geometallurgical model was developed in three steps using the Malmberget iron ore deposit, northern Sweden as a case study. It is based on a mineralogical-particle approach which means that the mineral information is in the focus. Firstly, the geological model describes quantitatively the variation within the ore body in modal composition and mineral textures. Traditional geological textural descriptions are qualitative and too vague and therefore a method that describes and distinguishes quantitatively different mineral textures and creates different types called textural archetypes was developed. The second part of the geometallurgical model is a sub-model which forecasts how ore will break and which kind of particles will be generated. A simple algorithm was developed to estimate the liberation distribution for the progenies of each textural archetype. The model enables numerical prediction of the liberation spectrum with varying modal mineralogy. The third step includes a process model describing quantitatively how different particles behave in each unit process stage. As a whole the geometallurgical model takes the spatial information of the geological model in terms of modal composition and textural type. The particle breakage model forecasts the liberation distribution of the corresponding feed to the concentration process and the process model returns the metallurgical response in terms of product quality (grade) and effectively (recovery).

Test Methods for Characterising Ore Comminution Behavior in Geometallurgy

Abstract: Comminution test methods used within mineral processing have mainly been developed for selecting the most appropriate comminution technology for a given ore, designing a grinding circuit as well as sizing the equipment needed. Existing test methods usually require comparatively large sample amounts and are time-consuming to conduct. This makes comprehensive testing of ore comminution behavior – as required in the geometallurgical context – quite expensive. Currently the main interest in the conduct of comminution test lies in the determination of particle size reduction and related energy consumption by grindability test methods, which provide the necessary information about mill throughput. In this procedure mineral liberation is regarded as a fixed parameter due to missing this information in ore characterization as well as a lack of suitable comminution models. However, ignoring the connection between particle size and mineral liberation prevents the scheduling and controlling of the production process from being optimal. For these reasons new comminution tests need to be developed or alternatively the existing test methods need to be suited to geometallurgical testing where the aim is to map the variation of processing properties of an entire ore body. The objective of this research work is on the one hand to develop small-scale comminution test methods that allow linking comminution behavior and liberation characteristics to mineralogical parameters, and on the other hand establish a modeling framework including mineral liberation information. Within the first stage of the study the comminution of drill cores from Malmberget’s magnetite ore, classified by modal mineralogy and texture information, have been investigated. It was found that there is a direct correlation between the mechanical strength of the rock, as received from unconfined compressive or point load tests, and the crusher reduction ratio as a measure for crushability. However, a negative correlation was found between crushability and grindability for the same samples. The grindability showed inverse correlation with both magnetite grade and the magnetite’s mineral grain size. The preliminary conclusion is that modal mineralogy and micro-texture (grain size) can be used to quantitatively describe the ore comminution behavior although the applied fracture mechanism of the mill cannot be excluded. With crushed ore samples from Malmberget also grindability tests and mineral liberation analyses were conducted using laboratory tumbling mills of different size. Starting from the dimensions of the Bond ball mill a modified test method was developed where small size samples of approximately 220 g were pre-crushed and ground in a down-scaled one-stage grindability test. Down-scaling was done by keeping similar impact effects between the mills. Mill speed and grinding time were used for adjusting the number of fracture events in order to receive similar particle size distributions and specific grinding energy when decreasing mill size by the factor 1.63. A detailed description of the novel geometallurgical comminution test (GCT) is given. With respect to ore crushability and autogenous and semiautogenous grinding (AG/SAG) also drop weight tests were conducted. For a more accurate and precise measurement of the energy transferred to the sample a novel instrumented drop weight was used. Initial tests with fractions of drill cores and pre-crushed ore particles showed that the simple energy calculation based on potential energy needs to be corrected. For the future work these tests will be extended to other ore types in order to investigate the effects of mineralogy and to include mineral liberation in comminution models suitable for geometallurgy.

Method for cleaning bypass gases of the cement or mineral industry, and system of the cement or mineral industry

Abstract: A method for cleaning bypass gases of the cement or mineral industry includes cooling down a removed bypass gas from a cement or mineral processing plant to a temperature of between 500° C. and 150° C., and coarsely dedusting the bypass gas, the dust burden being reduced by 30 to 95%. After the dedusting step, the gaseous constituents contained in the partly dedusted bypass gas are reduced in a reducing step. The partly dedusted bypass gas is further finely dedusted. The gaseous constituents reducing step includes at least a catalytic reduction of one or more of nitrogen oxides, hydrocarbons, and carbon monoxide.

Inhibiting agent capable of selectively inhibiting calcium-containing gangue minerals in scheelite ores

Abstract: The invention discloses an inhibiting agent capable of selectively inhibiting calcium-containing gangue minerals in scheelite ores, and belongs to the technical field of mineral processing engineering. The inhibiting agent is formed by reacting the mixture of metal salt 80 percent-90 percent and polycarboxylate compounds 10 percent-20 percent. As metal ions have a selective activation effect on the calcium active points of the calcium-containing minerals, the selective inhibition effect on the calcium-containing gangue minerals by the polycarboxylate compounds is enhanced, and the effect of the inhibiting agent is improved. The inhibiting agent can be used in ore slurry at normal temperature, the usage amount of the inhibiting agent ranges from 200 g/t to 300 g/t, and the inhibiting agent is suitable for recovering scheelite from ores by selectively inhibiting the calcium-containing gangue minerals such as fluorspar and calcite when scheelite gangue minerals are mainly the calcium-containing minerals (the fluorspar and the calcite).

Mineral and Elemental Composition Features of "Loose" Oolitic Ores in Bakchar Iron Ore Cluster (Tomsk Oblast)

Abstract: Geo-technological investigation considerations of iron ore deposits within the Bakchar ore cluster are being carried out. The mineral and elemental composition of "loose" ores have been studied, embracing such important aspects as the distribution pattern of valuable and harmful impurities, the determination of element concentrators (such as vanadium, phosphate and sulphur) in basic minerals and the analysis of ore composition varaiation in volume ore cluster. Based on investigation results the mineral and elemental composition characteristic features of "loose" ores were defined. Although hydrogoethite was the basic identified ore mineral, such minerals as goethite, lepidocrocite, leptochlorite, siderite and hisingerite were also found. The deportment of calcium phosphate (anapaite) and phosphates of rare-earth elements (monazite, killarite), which are associated with the harmful impurity- phosphorous, are described. It has been defined that the ore constituent composition contains such persistent impurities as vanadium and manganese, the content of which is 0.35% and 0.03%, respectively. The "loose" ores are continuous in mineral composition, both in area and cross-section throughout the Bakchar ore cluster. Based on the sample element composition analysis the most perspective areas for further mineral processing could be: western with the fraction of 1....0.2mm. and eastern- fraction of 1...0.1mm.

Alkaline leaching silicon removal method of manganese ore

Abstract: The invention belongs to the technical field of ore processing and relates to an alkaline leaching silicon removal method of manganese ore. The method comprises the following steps: (1) uniformly mixing the manganese ore with a NaOH solution to obtain uniform ore pulp, wherein the NaOH content of the NaOH solution is less than the SiO2 content of the manganese ore; (2) performing alkaline leaching silicon removal reaction on the uniform ore pulp prepared in the step (1) at 140-220 DEG C for 3-5 hours under high pressure; (3) filtering the ore pulp after the reaction in the step (2), and collecting filter liquor and filter residues; (4) uniformly mixing the filter residues in the step (3) with the NaOH solution, and performing alkaline leaching; and (5) filtering the ore pulp obtained after the reaction in the step (4), wherein filter residues are manganese concentrate. According to the method, components in the ore can be comprehensively and effectively utilized; compared with a conventional chemical alkaline leaching silicon removal method, the alkaline leaching silicon removal method has the advantages that the alkali consumption can be reduced and a high-added-value product can be prepared; compared with a conventional physical concentration method, the alkaline leaching silicon removal method has the advantages that due to removal of physical concentration links, no tailings are generated and the manganese recovery rate theoretically can reach 100%.

Mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite

Abstract: The invention relates to a mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite. The mineral processing technology is characterized by comprising the steps: raw material preparation, agglomeration, drying treatment, reduction roasting, water quenching of roasted materials, screening wet preconcentration, stage grinding and magnetic separation. With the adoption of the mineral processing technology for reducing, roasting, iron extraction and impurity removal of limonite, the metallization ratio is 90-95 percent, the recovery ratio of iron reaches 90-95 percent, and tailings with the grade of 5-10 percent is final tailings.

Up-scaling of froth flotation equipment

Abstract: The up-scaling of flotation equipment has been investigated based on comparisons between laboratory, pilot and industrial scale flotation tests and a characterization study of large-scale industrial flotation cells in Boliden’s Aitik copper mine in Northern Sweden. The use of high volume flotation cells has nowadays become more and more common to deal with the production of high capacity, low-grade open pit mines, which are typically copper or gold mines. Implementation of large flotation cells in the mineral beneficiation process holds several financial benefits, but gives no guarantee of an equal or improved metallurgical performance. From a historical point of view, flotation plants have been designed based on the results of laboratory tests, multiplied with a time up-scaling factor at which recovery was expected to be above a certain value on the industrial scale. Due to the uniqueness of each ore, such an experience-based factor has often resulted into under- or overestimations of the total required cell volume. One of the main differences between lab and industrial flotation in this research is found the be the behaviour of fine particles (-45 ?m), which are shown to have slower flotation kinetics and poor recovery on the industrial scale in comparison to the lab scale, but are also accompanied by a relatively high degree of gangue mineral entrainment in lab tests. A characterization of the industrial flotation equipment was done to acquire more information on the sub-processes that take place within the cells. Sampling on different depths in 160 m3 rougher and scavenger cells revealed a well-mixed regime in the lower cell half, decreasing homogeneity above a depth of 2,5 m under the froth, and an accumulation zone of fine-grained copper-rich minerals directly under the pulp-froth interface. The effectiveness of the low-turbulent zone in the top half of the industrial flotation cell is questioned, while the general trend in flotation cell design of increasing volume even shows an increasing height-to-diameter ratio, which could eventually lead to a larger fraction of the cell volume being low turbulent. To obtain more insight in the functioning of these flotation cell sub-zones, the use of a bubble load measurement is proposed to determine the recovery of both valuable and gangue minerals as a profile of cell height. Furthermore test work in a laboratory pilot scale cell with adjustable height is discussed, in which the volume fractions of the mixing zone, quiescent zone and froth zone can be varied. Combination of these two investigations is expected to allow better understanding of how an industrial flotation cell functions.

Mineral dressing process for low-grade marble magnetic iron ore

Abstract: The invention discloses a mineral dressing process for low-grade marble magnetic iron ore. The mineral dressing process comprises the following steps: (1) multistage crushing, to be specific, marble magnetic iron ore containing 10% of TFe is crushed for a first stage, and then screened; ore grains of which the grain size is more than 5 cm are magnetically and dryly thrown to remove waste rocks, and then crushed for a second stage; ore grains of which the grain size is more than 3 cm are washed to remove mineral powder; the ore grain crushed for the second stage and the ore grains washed are magnetically and dryly thrown to remove waste rocks, and then crushed for a third stage via a roll crusher so as to obtain ore of which the grain size is less than or equal to 2 cm; (2) grinding and classifying, to be specific, enabling the percentage of mineral powder of which the fineness is 150 mesh to reach 90%; (3) multistage washing, to be specific, washing the classified mineral powder twice so as to remove calcite powder from iron ore concentrate; (4) dewatering and filtration, to be specific, magnetically dewatering the washed mineral powder, and enabling the magnetically dewatered mineral powder to pass through a filtering machine so as to obtain powdered iron. The TFe of the iron ore concentrate obtained by adopting the process is larger than or equal to 62%, the ore dressing recovery percentage is larger than or equal to 87%, and the yield is increased by 50%.

Research on mineral processing for high silica low grade hematite ore in Xinjiang

Abstract: In order to develop and utilise cheap iron ores with low quality for cost reduction, a hematite ore from Xinjiang province was investigated to determine the iron increase and silicon reduction using ore dressing process experiments. Results showed that iron concentrate with 61%Fe and iron recovery of 66% were achieved through the process flowsheet of grinding, high intensity magnetic separation, regrinding of coarse concentrate, clean concentration by high intensity magnetic separation, roughing reverse floatation and cleaning reverse floatation of the high intensity concentrate, with the tailings from this latter stage fed back into the roughing reverse floatation stage.