Showing papers on "Sodium sulfide published in 2011"
TL;DR: A copper-catalyzed thiolation annulation reaction of 2-bromo alkynylbenzenes with sodium sulfide with high yields of benzo[b]thiophenes has been developed.
Abstract: A copper-catalyzed thiolation annulation reaction of 2-bromo alkynylbenzenes with sodium sulfide has been developed. In the presence of CuI and TMEDA, a variety of 2-substituted benzo[b]thiophenes were readily prepared in moderate to good yields by the reaction of 2-bromo alkynylbenzenes and Na2S·9H2O.
118 citations
TL;DR: Long term leachability tests under ambient conditions at pH 7 showed the produced precipitate to be essentially insoluble, and the removal/precipitation of selenium with sodium sulfide from initially weakly acidic sulfate solutions containing 300 mg/L of Selenium(IV) at 23 °C was studied.
86 citations
TL;DR: In this paper, the authors used industrial sodium sulfide to investigate the yield, dissolved keratin characteristics, and properties of regenerated products to assess the potential of using SDS as a means of converting waste feathers into a bio-polymer.
Abstract: Feather keratin has been widely studied for use as a bio-based material. In this paper, we dissolve feather keratin using industrial sodium sulfide to investigate the yield, dissolved keratin characteristics, and properties of regenerated products to assess the potential of using sodium sulfide as a means of converting waste feathers into a bio-polymer. Optimal conditions appeared to require short incubation times in order to give maximum strength in the regenerated product. This limits the yield to approximately 55%. Air-dried films and acid-precipitated samples are all readily re-crosslinked, suggesting the re-crosslinking process is robust. Minimizing exposure to the highly alkaline conditions appears favorable to final product strength through minimizing alkaline chain damage. The β-sheet structure of the parent keratin is largely maintained. The regenerated keratin was shown to have potentially attractive physical properties for use as a bio-polymer.
69 citations
TL;DR: In this article, an integrated hydrometallurgical process for the production of zinc and lead concentrates from lean oxidized zinc ores by alkaline leaching, followed by two-step sulfide precipitation of lead and zinc sulfides, is developed.
38 citations
TL;DR: One pot asymmetrical double allylations of sodium sulfide catalyzed by an iridium complex along with a combination of caesium fluoride and water in dichloromethane have been realized and thedouble allylation products with two C-S bond chiral centers were obtained in 67-99% yields.
33 citations
TL;DR: In this paper, the intercalation of semiconductor nanoparticles, such as copper sulfide or cobalt sulfide, into montmorillonite was carried out by solid-solid reactions of Cu(II)- or Co(II) with sodium sulfide at room temperature.
32 citations
Patent•
20 Dec 2011TL;DR: In this article, a pre-processed stream containing an aqueous liquor that contains at least a portion of hemicelluloses and a residual biomass that contains celluloses and lignin is generated.
Abstract: Alcohols useful as fuel compositions are produced from biomass by pretreating the biomass prior to hydrolysis and fermentation. In the pretreatment, the biomass is contacted with an aqueous solution containing a dilute acid with concentration of up to 10 wt % producing a predigested stream containing an aqueous liquor that contains at least a portion of hemicelluloses and a residual biomass that contains celluloses and lignin; separating at least a portion of the aqueous liquor from the residual biomass providing an aqueous liquor stream and a pre-digested biomass stream; then contacting the pre-digested biomass stream with a cooking liquor containing at least one alkali selected from the group consisting of sodium hydroxide, sodium carbonate, sodium sulfide, potassium hydroxide, potassium carbonate, ammonium hydroxide, and mixtures thereof and water. A process that allows for higher recovery of carbohydrates and thereby increased yields is provided.
30 citations
Patent•
06 Jul 2011
TL;DR: In this article, an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid no.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4).
Abstract: The invention relates to an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding the laterite-nickel ore, mixing with sulfuric acid, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid No.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4); (3) precipitating the aluminum in the liquid No.2 by using alkali, filtering, precipitating the nickel in filtrate by using sodium sulfide, filtering, precipitating the magnesium by using the alkali, and treating filter residue to obtain aluminum oxide, nickel hydroxide, nickel sulfide and magnesium oxide respectively; and (4) precipitating the aluminum and the nickel in the liquid No.2 by using the alkali, treating mixed slag containing the aluminum and the nickel by using the alkali to obtain aluminum hydroxide and nickel hydroxide products, and precipitating the magnesium in filtrate subjected to aluminum and nickel precipitation by using ammonia or ammonium saltto obtain a magnesium oxide product. The method is suitable for treating various laterite-nickel ores, three wastes (waste gas, waste water and waste residue) are not generated, and valuable components magnesium, nickel, iron, aluminum and silicon in the laterite-nickel ore are separated and extracted.
21 citations
TL;DR: In this paper, an electrolytic manganese dioxide (EMD) was prepared from manganous cake, which is an oxide material and byproduct obtained during processing of manganized nodules.
21 citations
TL;DR: In this paper, a nano-CdS crystal has been succesfully synthesized by composite molten salt (CMS) method for the first time, using composites as a reaction solvent, sodium sulfide and cadmium nitrate hexahydrate as reactants at temperature of 200°C for 24h in the absence of organic dispersant or capping agents.
Abstract: Nano-CdS crystal has been succesfully synthesized by composite molten salt (CMS) method for the first time, using composite molten salt as a reaction solvent, sodium sulfide and cadmium nitrate hexahydrate as reactants at temperature of 200 °C for 24 h in the absence of organic dispersant or capping agents. X-ray diffraction and field emission scanning electron microscopy (FESEM) images indicated that the as-synthesized product were well crystallized and belonged to nano-scale. Their UV–vis absorption spectrum demonstrated a band gap of 2.49 eV corresponding to the absorption edge of 499 nm. The experimental result of photocatalytic degradation on methyl orange by the nano-CdS showed much better photocatalysis than that by the commercial CdS powder under the irradiation of ultraviolet light source.
20 citations
TL;DR: In this article, a platinized CdS/TiO2 nanotubes hybrid for hydrogen production was evaluated in the aqueous solution containing sodium sulfide and sodium sulfite as hole scavengers under visible light irradiation (λ > 420 nm).
TL;DR: In this paper, a simple procedure for the production of various poly(alkylene sulfide)s and the way reaction parameters influence the properties of the polymers formed has been examined.
TL;DR: In this article, a pilot-scale study of sodium sulfide (Na2S) aqueous solutions for NO2 absorption was conducted to obtain field data for process design and system operations.
Abstract: A pilot-scale study of sodium sulfide (Na2S) aqueous solutions for NO2 absorption was conducted to obtain field data for process design and system operations. Considered parameters include Na2S concentrations in the scrubbing solutions, gas mass flow rate, liquid mass flow rate, liquid/gas ratio (L/G), pH, and gas residence time. The effects of these parameters on NO2 absorption in a packed tower were investigated thoroughly. The height of transfer unit of the system was deducted as a function of the tested parameters that can be used for designing a NOx scrubbing system. The absorption of NO2 is not sensitive to the inlet NO2 concentration. However, as expected, the NO2 absorption increases with the increase of L/G ratio. An L/G greater than 2.5 is essential to a practical NO2 scrubbing application. The pilot test suggested that the scrubbing solution is with Na2S concentration greater than 0.0015 M at pH 9. The solution effectively removed more than 90% of the incoming NO2 in the five-foot height packed bed scrubber. The study also indicates that a gas residence time of 4.5 s is essential to achieve more than 80% NO2 absorption. © 2011 American Institute of Chemical Engineers Environ Prog, 2011.
TL;DR: In this article, a process is proposed to recover copper and cyanide from barren solutions from the Merrill-Crowe cementation process with zinc dust, based on inducing nucleated precipitation of copper and silver in a serpentine reactor, using sodium sulfide as the precipitator, and sulfuric acid for pH control.
Abstract: Cyanidation is the main process for gold and silver recovery from its ores. In this study, a process is proposed to recover copper and cyanide from barren solutions from the Merrill-Crowe cementation process with zinc dust. This technology is based on inducing nucleated precipitation of copper and silver in a serpentine reactor, using sodium sulfide as the precipitator, and sulfuric acid for pH control. Results show that pH value has a significant effect on copper cyanide removal efficiency, and it was determined the optimal pH range to be 2.5 - 3. At this pH value, the copper cyanide removal efficiency achieved was up to 97 and 99%, when copper concentration in the influent was 636 and 900 ppm. respectively. In this process (sulphidization-acidification-thickening-HCN recycling), the cyanide associated with copper cyanide complexes, is released as HCN gas under weakly acidic conditions, allowing it to be recycled back to the cyanidation process as free cyanide. Cyanide recovery was 90%. Finally, this procedure was successfully run at Minera William in Mexico.
TL;DR: In this paper, a one-pot three-component synthesis of lead sulfide nanoparticles was developed on the basis of the exchange reaction between the lead acetate and sodium sulfide in water at the ambient conditions.
Abstract: A convenient and effective one-pot three-component synthesis of the lead sulfide nanoparticles was developed on the basis of the exchange reaction between the lead acetate and sodium sulfide in water at the ambient conditions. A possibility was shown of the direct reaction between the lead Pb2+ and sulfide S2− ions in an aqueous solution, resulting in a solid phase which contained PbS nanoparticles only, avoiding the hydrolysis stage.
Patent•
23 Nov 2011
TL;DR: In this paper, a preparation method of a Cu-Zn-Sn-S thin film, comprising the steps of adopting a successive ionic layer adsorption reaction method, sequentially or alternatively soaking one substrate in a cation precursor solution and an anion precursor solution to prepare a Cu2Sx film and ZnS film laminated precast layer structure, and then performing heat treatment to obtain the Cu Zn-sn-s thin film.
Abstract: The invention discloses a preparation method of a Cu-Zn-Sn-S thin film, comprising the steps of: by adopting a successive ionic layer adsorption reaction method, sequentially or alternatively soaking one substrate in a cation precursor solution and an anion precursor solution to prepare a Cu2SnSx film and ZnS film laminated precast layer structure or a Cu2S film and ZnSnSx film laminated precast layer structure, and then performing heat treatment to obtain the Cu-Zn-Sn-S thin film; the cation precursor solution comprises at least one of copper ions, stannum ions and zinc ions, and the anion precursor solution is selected from at least one of a sodium sulfide solution, a potassium sulfide solution and an ammonium sulfide solution; the substrate is selected from one of glass, PI (polyimide), a stainless steel plate, a molybdenum plate and a titanium plate. The preparation method of Cu-Zn-Sn-S thin film not only solves the problem that the metal components are difficult to control, but also prevents the copper ions from moving to the surface of the film to form a sulfur copper phase. The preparation method is simple and applicable, low in cost and suitable for industrialization production.
TL;DR: In this article, the authors have shown that the introduction of sodium sulfide into the Na2O-P2O5-Na2S system is accompanied by an approximately threefold increase in electrical conductivity, although the concentrations of charge carriers (sodium ions) in the glasses amount to ∼17 and ∼26 mmol/cm3, respectively.
Abstract: The glasses, in which oxygen was partially replaced with sulfur, have been synthesized in the Na2O-P2O5-Na2S system. The chemical and chromatographic analyses of the glasses synthesized have been performed. The temperature-concentration dependences of electrical conductivity of the glasses have been studied over a wide temperature range; the glass transition temperatures and the nature of charge carriers have been determined. The IR spectra and Raman spectra have been recorded at room temperature; the density and microhardness of the glasses and ultrasound velocity have been measured. A comparison of the electrical conductivities of the investigated glasses with those of the earlier studied glasses in the Na2O-P2O5 system has shown their fair coincidence. The introduction of sodium sulfide into the Na2O-P2O5 system is accompanied by an approximately threefold increase in electrical conductivity, although the concentrations of charge carriers (sodium ions) in the glasses amount to ∼17 and ∼26 mmol/cm3, respectively. The rise in electrical conductivity has been assumed to be caused by the increase in the degree of dissociation of polar structural chemical units including sulfide ions and by the higher mobility of sodium ions in the oxygen-free matrix.
TL;DR: In this paper, it was shown that sodium polysulfides can be inserted into zeolite LTA when a mixture of dried zeolites with anhydrous sodium sulfide and sulfur is heated under vacuum.
Patent•
13 Jul 2011
TL;DR: In this article, a process for producing polyphenyl thioether is described, comprising of mixing hydrogenous sodium sulfide, lithium chloride and N-methyl pyrrolidone in the weight ratio of (20-25): (2-6): (70-80), co-boiling the mixture and inert gases at 150-210 DEG C for distilling and dehydrating; separating solvent by refining; respectively adding santochlor, solvent and lithium chloride in anhydrous sodium sulfides, separating after complete reaction to obtain polyphenylene sulfide
Abstract: The invention relates to a process for producing polyphenyl thioether, comprising the following steps of:, mixing hydrogenous sodium sulfide, lithium chloride and N-methyl pyrrolidone in the weight ratio of (20-25): (2-6): (70-80), co-boiling the mixture and inert gases at 150-210 DEG C for distilling and dehydrating; separating solvent by refining; respectively adding santochlor, solvent and lithium chloride in anhydrous sodium sulfide, separating after complete reaction to obtain polyphenylene sulfide; compositely washing the polyphenylene sulfide to obtain pure polyphenylene sulfide; and reclaiming the lithium chloride by filtering, reclaiming the solvent and flashly evaporating dimethylbenzene solution in a two-period mode and cooling and crystallizing The invention has the advantages of low cost, simple process, excellent performance of synthetic resin and high solvent recovering rate
Patent•
14 Sep 2011
TL;DR: In this article, a method for synthesizing low-chloride polyphenylene sulfide resins is presented, comprising of the following steps: taking sodium sulfide and p-dichlorobenzene with the molar ratio of 1:1 as raw materials, N-methyl-2-pyrrolidone as a solvent, and carrying out polycondensation to generate the polyphenylon sulfide resin under the action of alkali metal cosolvent.
Abstract: The invention discloses a method for synthesizing low-chloride polyphenylene sulfide resin, comprising the following steps: taking sodium sulfide and p-dichlorobenzene with the molar ratio of 1:1 as raw materials, N-methyl-2-pyrrolidone as a solvent, and carrying out polycondensation to generate the polyphenylene sulfide resin under the action of alkali metal cosolvent. The synthesizing process mainly comprises the following steps: adding adjuvant lithium aluminum hydride in the dewatering phase of sodium sulfide; adding molecular weight regulator and deionizer in the polycondensation stage; and adopting an extraction process in the resin recovery stage. The product obtained in the invention has low content of halogen element, relative low polydispersion coefficient, very narrow molecularweight distribution, high oxygen index and other excellent performance indexes, can be used as products such as injection moulds, extrusion moulds, fibers, films and the like, can be widely used in the fields such as machinery, chemical industry, electrical and electronic products, military project, aerospace and the like, and is particularly applied to electrical and electronic field with very excellent electrical insulation property.
TL;DR: In this article, a convenient and inexpensive procedure for the synthesis of thieno[2,3-b]quinolines was devised, which can be easily converted to quinoline by using sodium sulfide in ethanol.
Patent•
04 May 2011
TL;DR: In this article, a method for producing battery-level refined nickel sulfate with electrolyte is described, and the product produced is an emerald granular crystal which is a square crystal and the crystal grain diameter is greater than 2 mm and conforms to the HG/T2824-1997 standard.
Abstract: The invention discloses a method for producing battery-level refined nickel sulfate with electrolyte. The method comprises the following steps: (1) concentrating and crystallizing: putting the nickel-containing electrolyte in which the copper is removed (nickel content is greater than or equal to 1 g/L) into a reaction kettle, steam-heating, concentrating and separating to obtain coarse nickel sulfate; (2) oxidizing to remove iron: dissolving the coarse nickel sulfate in water, and adding hydrogen peroxide; (3) vulcanizing to remove copper, lead and zinc: vulcanizing to remove copper, lead and zinc through the reaction of sodium sulfide and sulfuric acid; (4) concentrating to remove calcium and magnesium: removing calcium and magnesium by evaporation and concentration; (5) removing calcium and magnesium with sodium fluoride: under the action of mechanical stirring, adding second-grade sodium fluoride, and controlling the pH value with alkali liquid so that calcium and magnesium become fluoride precipitates to be removed; and (6) concentrating and crystallizing: concentrating the purified solution, and crystallizing to obtain the battery-level refined nickel sulfate. The product produced by the invention is an emerald granular crystal which is a square crystal, and the crystal grain diameter is greater than 2 mm and conforms to the HG/T2824-1997 standard.
Patent•
01 Jun 2011
TL;DR: In this paper, a method for treating waste hydrochloric acid containing lead, zinc and ferrum was proposed, where the pH value of the further filtered filtrate between 0.5 and 4.5 was adjusted.
Abstract: The invention discloses a method for treating waste hydrochloric acid containing lead, zinc and ferrum. The method comprises the following steps of: adjusting the pH value of the waste hydrochloric acid containing lead, zinc and ferrum to make the pH value of the further filtered filtrate between 0.5 and 4.5; adding the filtrate into sodium sulfide solution, fully stirring and reacting; and filtering; the filtrate is the treated hydrochloric acid, and the main component of the treated hydrochloric acid is ferrous chloride; the filter residue is a mixture of lead sulfide, zinc sulfide and ferrous sulfide. By the method, the separation of lead, zinc and ferrum can be realized effectively.
TL;DR: In this paper, a new method of hydrogen production from biomass via a sulfur redox cycle at moderate temperatures has been proposed, which can utilize excess sulfur from hydrocarbon refining processes and waste or geothermal heat.
TL;DR: In this article, the authors evaluated the catalytic wet air oxidation of sulfide present in spent caustic wastes generated during petroleum refining using two supports (silica and clinoptilololite) and two metal oxides (vanadium and copper) to produce different catalysts.
Abstract: This work evaluates the catalytic wet air oxidation of sulfide present in spent caustic wastes generated during petroleum refining. Operating conditions were 70 °C and atmospheric pressure, with and without catalyst. Two supports (silica and clinoptilolite) and two metal oxides (vanadium and copper) were employed to produce different catalysts. The sulfide oxidation without catalyst displays a short induction period and complete oxidation of sulfide at 210 min. The most active catalysts were Cu/silica (CS) and V/clinoptilolite (VC), which improved the sulfide oxidation, achieving complete oxidation in 20 and 26 min, respectively.
Patent•
13 Apr 2011
TL;DR: In this article, a chemical metallurgical technology which prepares gas phase white carbon black, transparent magnesium carbonate, active magnesium oxide and nickel sulfate with whole wet method using serpentine as raw material, and reclaim iron and chromium as concentrate.
Abstract: The invention relates to a chemical metallurgical technology which prepares gas phase white carbon black, transparent magnesium carbonate, active magnesium oxide and nickel sulfate with whole wet method using serpentine as raw material, and reclaim iron and chromium as concentrate. The process comprises using sulfuric acid as leaching agent, using halide as activating agent, decomposing and transgressing silicon in serpentine in the form of gas phase halide, then preparing gas phase white carbon black through ammonium and oxidization, leading manganese, iron, nickel and chromium which are leached to entering into solution in sulfate form, preparing chromium concentrate through one time alkalization deposition and purification, preparation iron concentrate through second time alkalization deposition and purification, preparing nickel sulfate through transforming by third time sulfidization deposition, and preparing active magnesium oxide through transforming by fourth time carbonization deposition, wherein hydrogen sulfide which is discharged through the acidolysis vulcanization nickel precipitation reaction is absorbed as sodium sulfide with caustic soda and flows back nickel precipitation to be reclaimed, and ammonia sulfate, the mother liquor of manganese precipitation by carbonization is compressed and crystallized into by-product industrial ammonia sulfate. The technology has high reclaiming usage rate for valuable elements, avoids the pollution of three wastes, and is suitable to the comprehensive development for serpentine.
Patent•
20 Jul 2011
TL;DR: In this paper, a method of polyarylene sulfide film preparation is described, characterized by comprising the following steps of: adding 5-100 parts of auxiliaries, 20-80 parts of catalyst, 1-100 part of alkali and 200-600 parts of organic solvent to a reaction kettle with a nitrogen inlet/outlet pipe, a water separator, a stirrer and a thermometer; adding 130 parts of 60% sodium sulfide, under nitrogen protection, performing dehydration reaction at the temperature of 160-200 DEG C for 0.5-
Abstract: The invention discloses a preparation method of polyarylene sulfide film, characterized by comprising the following steps of: adding 5-100 parts of auxiliaries, 20-80 parts of catalyst, 1-100 parts of alkali and 200-600 parts of organic solvent to a reaction kettle with a nitrogen inlet/outlet pipe, a water separator, a stirrer and a thermometer; adding 130 parts of 60% sodium sulfide, under nitrogen protection, performing dehydration reaction at the temperature of 160-200 DEG C for 0.5-3 hours; cooling to 80-150 DEG C, adding 147-352 parts of aromatic compound polyhalide, reacting at the temperature of 110-250 DEG C for 1-8 hours; keeping at the temperature of 160-320 DEG C for 1-8 hours; filtering the reactant liquor, separating, washing the polymer, drying, purifying with deionized water and acetone, and drying at the temperature of 120 DEG C and the vacuum degree of 0.09MPa for 24 hours to obtain the high molecular weight polyarylene sulfide film-grade resin; preparing the high molecular weight polyarylene sulfide film-grade resin into polyarylene sulfide resin particles by twin screw extrusion granulation; drying the polyarylene sulfide resin particles at the temperature of 100-120 DEG C for 4-10 hours and extruding to form film of 1-3mm in a casting machine; and laterally stretching the film for 2-10 times and then longitudinally stretching the film for 2-10 times in a two-way film stretching machine to prepare the film with even thickness.
TL;DR: In this article, the properties of cadmium sulfide (CdS) nanoparticles generated in the aqueous phase by adding a specially obtained maleic anhydride/styrene copolymer and polymers with different electrical charges were improved in order to reduce their toxicity.
Abstract: The properties of cadmium sulfide (CdS) nanoparticles generated in the aqueous phase by adding a specially obtained maleic anhydride/styrene copolymer and polymers with different electrical charges—like alginate, chitosan, carrageenan, and polyvinyl pyrrolidone—were improved in order to reduce their toxicity. The cytotoxic effect of CdS semiconductor nanoparticles coated with polymers on cultures of Vero cells was investigated. CdS semiconductor nanoparticles were synthesized and stabilized in aqueous-polymeric system by mixing cadmium nitrate with sodium sulfide into aqueous polymeric solution, with nitrogen gas bubbled throughout the system. The fluorescence properties of nanoparticles depend on the nature of capping polymer. Transmission electronic microscopy gives the information about the size and size distribution of the nanoparticles. The computed size diagrams of CdS nanoparticles have different frequency depending of the used polymer. The nanoparticles coated with polymers presented low toxicity ...
Patent•
18 May 2011
TL;DR: In this article, a treatment process and device of a waste gas containing hydrogen sulfide and carbon dioxide is described. But the treatment process comprises the following steps of: firstly decarbonizing the waste gas through a multilevel barium sulfide solution; then carrying out alkali wash through a sodium hydroxide solution, and then emptying; separating sediments generated after decarbonization to obtain a barium carbonate product; recycling mixed liquor generated after the decarbonisation; and evaporating, crystallizing and separating a solution obtained by alkali washing to obtain
Abstract: The invention discloses treatment process and device of a waste gas containing hydrogen sulfide and carbon dioxide. The treatment process comprises the following steps of: firstly decarbonizing the waste gas through a multilevel barium sulfide solution; then carrying out alkali wash through a sodium hydroxide solution, and then emptying; separating sediments generated after decarbonization to obtain a barium carbonate product; recycling mixed liquor generated after the decarbonization; and evaporating, crystallizing and separating a solution obtained by alkali wash to obtain a sodium sulfide product. The treatment process and device provided by the invention have simple process flow, cannot only directly produce the barium carbonate by utilizing CO2 contained in a mixed gas, but also produce an H2S gas needed by next step reaction through reaction, thereby not only consuming the carbon dioxide gas contained in the mixed gas, but also obtaining a hydrogen sulfide gas with very high purity; and in addition, the crystal sodium sulfide is produced by using the hydrogen sulfide, therefore, no matter the environmental protection and the benefits are optimized.
Patent•
16 Feb 2011
TL;DR: In this paper, a method for purifying molybdenum sulfide in heavy metal waste water containing molybenum, and the like, is described, in particular to the technical field of water treatment, and this method comprises the following steps of: putting waste water consisting of the heavy metal moly bdenum and other heavy metals to be purified in a reaction tank, regulating the waste water to alkalinity and adding sodium sulfide for reacting, filtering, and after the precipitate subsides, draining the supernate, filtering through a filtering device
Abstract: The invention belongs to the technical field of water treatment, in particular to a method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like. The method comprises the following steps of: putting waste water containing the heavy metal molybdenum and other heavy metals to be purified in a reaction tank; regulating the waste water to alkalinity and adding sodium sulfide for reacting; filtering the waste water and putting filtered water in a sealing device; regulating the pH value of the waste water to 1-3 and reacting at normal temperature to guarantee that molybdenum acid radical ions are all converted into molybdenum sulfide to precipitate; absorbing gas generated by using an absorption tower, wherein sodium hydroxide is used as absorption liquid; adding polyacrylamide used as a flocculating agent to an obtained solution and quickly stirring for reacting; standing still; after the precipitate subsides, draining the supernate, filtering through a filtering device, and treating the precipitate for recycling; regulating the pH of the obtained acid solution to neutrality, adding a coagulant compounded by polymeric aluminum and ferrous sulphate and quickly stirring to remove redundant sulfur ions and further improve the quality of yield water; standing still; and after the precipitate subsides, filtering. The invention has the advantages of good treatment effect, simple and convenient treatment equipment, low treatment cost, higher purity of recovered molybdenum sulfide, and the like.