Showing papers in "Mineral Processing and Extractive Metallurgy in 2021"
TL;DR: Aqueous alkaline glycine solutions present technical advantages over acidic solutions for leaching oxidised copper minerals hosted in carbonate mineral matrix phases as discussed by the authors, and the leaching an...
Abstract: Aqueous alkaline glycine solutions present technical advantages over acidic solutions for leaching oxidised copper minerals hosted in carbonate mineral matrix phases. In this study, the leaching an...
10 citations
TL;DR: In this paper, five Indian coals were subjected to solvent extraction under ambient pressure conditions using N-methylpyrrolidone (NPMR) for Indian coal washing.
Abstract: Indian coals have difficult to formidable washability characteristics. Presently, five Indian coals were subjected to solvent extraction under ambient pressure conditions using N-methylpyrrolidone ...
8 citations
TL;DR: In this paper, a four stage fluidis... has been developed and designed to mitigate the emission of CO2 to mitigate global warming and climate change, and a four-stage fluidis...
Abstract: The increase of carbon dioxide (CO2) concentration in the atmosphere leads to global warming and climate change. To mitigate the emission of CO2, we have developed and designed a four stage fluidis...
7 citations
TL;DR: The reaction kinetics of hydrogen reduction of iron ore concentrate particles was studied in this article, where the reaction progress at tempera-gravimetric analysis was used to study reaction progress.
Abstract: The reaction kinetics of hydrogen reduction of iron ore concentrate particles was studied in the present research work. Thermogravimetric analysis was used to study the reaction progress at tempera...
6 citations
TL;DR: In this article, the organic extractant 2-ethylhexyl phosphonic acid mono-2-ethylhexylester (PC88A) diluted in kerosene from three different aqueous media (sulfuric, nitri...
Abstract: Solvent extraction of lanthanum(III) using the organic extractant 2-ethylhexyl phosphonic acid mono-2-ethylhexylester (PC88A) diluted in kerosene from three different aqueous media (sulfuric, nitri...
5 citations
TL;DR: In this article, the extraction of manganese from a low-grade MANG oxide ore was investigated in the presence of pretreated straw as reductant in a sulfuric acid medium.
Abstract: The extraction of manganese from a low-grade manganese oxide ore was investigated in the presence of pretreated straw as reductant in sulfuric acid medium. It was found that concentrated sulfuric a...
5 citations
TL;DR: In this paper, a series of complex physical, microstructure and phase changes has been shown to occur during reduction roasting involving: (i) the dehydration of serpentine, (ii) the formation of a high-silica amorphous phase, (iii) formation of Ni-Fe nanoparticles, and (iv) the nucleation, growth and recrystallisation of the forsterite (olivine) phase.
Abstract: Fundamental studies have been undertaken to determine the microstructural and phase transformations occurring during the reduction roasting of saprolite ores. Laboratory studies have been undertaken to simulate the conditions occurring during the reduction roast step of the Caron Process. Selected serpentine samples have been treated at temperatures between 500°C and 800°C in H/N gas mixtures, and leaching tests on the reduced samples have been undertaken. Phase and microstructural changes have been characterised using X-ray Powder Diffraction (XRD), Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) techniques. A series of complex physical, microstructure and phase changes has been shown to occur during reduction roasting involving: (i) the dehydration of serpentine, (ii) the formation of a high-silica amorphous phase, (iii) the formation of Ni-Fe nanoparticles, and (iv) the nucleation, growth and recrystallisation of the forsterite (olivine) phase. The principal mechanism of removal of nickel from the reduced ore has been shown to occur through the selective leaching of the Ni-Fe alloy nano-particles from the surfaces in the product oxide.
5 citations
TL;DR: In this paper, two different samples were collected from the Beneficiation Plant (BP) for detailed studies. Sample I and Sample II are the feeds to the spiral concentrator from an existing beneficiation circuit.
Abstract: Two different samples were collected from the Beneficiation Plant (BP) for detailed studies. Sample I and Sample II are the feeds to the spiral concentrator from an existing beneficiation circuit o...
4 citations
TL;DR: In this paper, a factorial design has been implemented to develop regression equations for leaching of Y and Eu from the phosphor coating of spent fluorescent lamps (FLs).
Abstract: Factorial design has been implemented to develop regression equations for leaching of Y and Eu from phosphor coating of spent fluorescent lamps (FLs). On the basis of leaching extent, H2SO4 was the...
4 citations
TL;DR: In this article, the feed of mineral processing plants usually consist of different minerals from various geological zones, which show different behavior in separation processes, and samples from different geological zones are collected.
Abstract: The feed of mineral processing plants, usually consist of different minerals from various geological zones, which show different behavior in separation processes. In this research, samples from sup ...
3 citations
TL;DR: In this article, the authors classify mining simulation models based on the level that feed stream to the plant and unit models are described, and the levels of modelling in this context are: bulk, mineral or...
Abstract: Mineral processing simulation models can be classified based on the level that feed stream to the plant and unit models are described. The levels of modelling in this context are: bulk, mineral or ...
TL;DR: In this paper, the authors investigated the kinetics of reduction of Banded Haematite Jasper ore with commercial coal in the temperature range 1273-1473 K.
Abstract: The kinetics of reduction of Banded Haematite Jasper ore with commercial coal was investigated in the temperature range 1273–1473 K. At 1273 and 1373 K, the degree of reduction was low. It increase...
TL;DR: The optimisation of the calcination process in industrial lime kilns is of particular importance because it affects the final quality of the lime, coal consumption, and pollutant emissions as discussed by the authors.
Abstract: The optimisation of the calcination process in industrial lime kilns is of particular importance because it affects the final quality of the lime, coal consumption, and pollutant emissions. This wo...
TL;DR: Two main parameters of cooling conditions and anti-solvent (ethanol) were significant in the size and shape of the copper sulfate crystals, the feedstock solution of which was produced with the hig
Abstract: Two main parameters of cooling conditions and anti-solvent (ethanol) were significant in the size and shape of the copper sulfate crystals, the feedstock solution of which was produced with the hig
TL;DR: In this paper, the authors present an experimental approach to measure and model the residence time distribution of vertical roller mill in cement clinker grinding circuit, where the dispersion model, tank-in-series mo...
Abstract: This paper presents an experimental approach to measure and model the residence time distribution of vertical roller mill in cement clinker grinding circuit. The dispersion model, tank-in-series mo...
TL;DR: In this article, a commercially applied process for producing mechanically strong pellets for smelting operation in submerged arc furnace is described, where the oxidation behavior of chromite ores is investigated.
Abstract: Oxidation treatment of chromite ores is a commercially applied process for producing mechanically strong pellets for smelting operation in submerged arc furnace. The oxidation behaviour of chromite...
TL;DR: In this article, experimental measurements have been undertaken of the gas-matte-spinel and gas-slagmatte spinel equilibria in the Cu-Fe-O-S-Si system at 1200°C and pSO2 of 0.1 and 0.6 bar.
Abstract: Experimental measurements have been undertaken of the gas-matte-spinel and gas-slag-matte-spinel equilibria in the Cu–Fe–O–S–Si system at 1200°C and pSO2 of 0.1 and 0.6 bar. The technique involved ...
TL;DR: In this article, a method for separating scandium from a multi-metal solution using hollow fibre supported liquid membrane (HFSLM) is described. But this method is not suitable for the extraction of scandum oxide.
Abstract: A method for separation of scandium and preparation of scandium oxide using hollow fibre supported liquid membrane (HFSLM) was described. Scandium was separated from a multi metal solution bearing ...
TL;DR: The Chuquicamata copper refinery has an annual production of 480,000 Tons of copper cathode (A grade) The electrochemical process has a duration of 10 days with 300 A/m2 current density In this g
Abstract: The Chuquicamata Copper refinery has an annual production of 480,000 Tons of copper cathode (A grade) The electrochemical process has a duration of 10 days with 300 A/m2 current density In this g
TL;DR: In this article, the improvement of properties of bitumen by blending it with low-density polyethylene (LDPE) and polypropylene (PP) at a different proportion was studied.
Abstract: Proper disposal of plastics and its derivatives is one of the biggest challenges all over the globe. Due to the improper management of plastic product environment is being polluted. Plastic waste generation and plastic waste-based pollution in Bangladesh is leaping at a high pace. Among numerous ways of disposal of waste plastics, one can be using it in flexible pavement construction. According to the Bangladesh Waste Database 2014, Dhaka city alone produces 25.44% (5,925.51 tons/ day) of waste, of which 8.45% is plastic. In the construction of bituminous pavement, plastics, as well as construction debris, are being used in the form of aggregate and filler materials popularly. This study focusses on the improvement of properties of bitumen by blending it with LDPE (Low-density polyethylene) and PP (Polypropylene) at a different proportion. Three cases were considered in the study for plastic waste addition, Case-01:- only LDPE; Case-02:- LDPE: PP=3:1; Case-03:- LDPE: PP=1:1. For each case, 3%, 6%, 9%, 12%, and 15% of plastic waste was mixed with bitumen. It was found that the penetration value and ductility decrease with the increasing proportion of plastic waste in bitumen, whereas the softening point increases for every case. Loss on heating, flash & fire point also been improved with the plastic addition. The performance of Case- 03 (LDPE: PP=1:1) is better than others. Minimum penetration value, 11 and maximum softening point, 90°C, is found for this case, which indicates a 90% improvement compared to virgin bitumen. Due to the addition of plastic waste, the ductility always gets affected. But overall, a significant improvement in the properties of bitumen is noticeable.
TL;DR: In this article, the thermodynamic aspects of the reduction roasting of saprolite ores in the Caron Process were investigated and the reduction experiments were conducted in controlled oxyge...
Abstract: Studies have been undertaken to investigate the thermodynamic aspects of the reduction roasting of saprolite ores in the Caron Process. Reduction experiments have been conducted in controlled oxyge...
TL;DR: In this article, the authors proposed approaches for optimisation of size distribution of ball mill product are to minimize the product 80% passing size or reach the desired product size while minimising the amount of −37μm passing size.
Abstract: Proposed approaches for optimisation of size distribution of ball mill product are to minimise the product 80% passing size or to reach the desired product size while minimising the amount of −37 μ...
TL;DR: The characteristics of iron ore fines were considered to have tremendous effects on their subsequent sintering performances, but it is difficult to judge their performance only based on their characteristics.
Abstract: The characteristics of iron ore fines were considered to have tremendous effects on their subsequent sintering performances, but it is difficult to judge their sintering performances only based on ...
TL;DR: In this paper, the mechanism and kinetics of reactions occurring during the reduction roasting of saprolite ores with 1 wt% elemental sulphur addition were investigated, and the effect of sulphur on Ni recovery was found to be due to the formation of a leachable nickel sulphide phase and suppression of sintering and recrystallisation of the olivine phase formed at high reduction temperatures.
Abstract: Laboratory studies have been undertaken to determine the mechanisms and kinetics of reactions occurring during the reduction roasting of saprolite ores with 1 wt% elemental sulphur addition. The reduction was undertaken using a 15%H/85%N gas mixture at temperatures between 400 and 800°C; nickel was recovered by subsequent leaching in an ammoniacial aqueous solution. The effect of sulphur on dehydroxylation, reduction and sintering was investigated. Improvements in nickel recoveries were obtained when 1 wt% S was added to the nickel-bearing serpentine ore prior to the reduction roasting. Characterisation of the reduced and leached ore samples indicated that this improved Ni recovery with S addition is due to the formation of a leachable nickel sulphide phase, and the suppression of sintering and recrystallisation of the olivine phase formed at high reduction temperatures.
TL;DR: The polythermal crystallization method has been used to extract sodium and potassium carbonate salts as valuable by-products as discussed by the authors, and the salt production was carried out using an alkaline carbonate solutio...
Abstract: The polythermal crystallization method has been used to extract sodium and potassium carbonate salts as valuable by-products. The salt production was carried out using an alkaline carbonate solutio...
TL;DR: In this article, the impact of mining exploration on sustainable development of a community in Guinea, West Africa was examined, where 300 questionnaires were distributed to community inhabitants, which enhanced the compilation of first-hand information.
Abstract: Mining exploration has left many communities in deplorable conditions, ranging from low levels of livelihood sustenance to poor health facilities and poor road networks. This study examined the impact of mining exploration on sustainable development of a community in Guinea, West Africa. The paper reviews literature published on mining and exploration and its impact on community environments.’ However, this study employed descriptive quantitative and correlational methods, which facilitated the gathering, classification and presentation of data that led to analysis, description and conclusion of the study. In this study, 300 questionnaires were distributed to community inhabitants, which enhanced the compilation of first-hand information. Data was analysed using descriptive statistics. The results disclosed numerous problems, ranging from health to education and poor road networks. It was revealed that, exploration activities have damaged lands utilised for agricultural purposes, and deposits of toxic substances have damaged soil nutrients, which caused degradation of the land tenure system. Such problems have left lands to be unproductive. Because of the foregoing problems discovered as negative impact, it is fitting for government and mining corporations to pay considerable attention to Sangaredi community and address such problems. This study identified issues bothering Sangaredi and other communities where mining explorations are conducted. It descriptively explained issues of exploration and established the negative impact mining activities have caused in the community. However, such impact adversely affects the community at large. In addition, academics and mining consultants will use this information as a source for further investigation on the subject matter.
TL;DR: Channel iron deposits (CID), comprising pisolitic or goethitic ores, remain a prominent iron ore resource in Western Australia as mentioned in this paper, and previous research work on CID pointed out their complexity in genesis
Abstract: Channel iron deposits (CID), comprising pisolitic or goethitic ores, remain a prominent iron ore resource in Western Australia Previous research work on CID pointed out their complexity in genesis
TL;DR: Copper reduction to metallic copper from dilute acid solutions containing Cu+2 was studied by means of sawdust from Radiata Pine as a reducing agent in this article, where the influence of the temperature, copper concentrat...
Abstract: Copper reduction to metallic copper from dilute acid solutions containing Cu+2 was studied by means of sawdust from Radiata Pine as a reducing agent. Influence of the temperature, copper concentrat...