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Sodium Sulfide Use Leaching

alkaline sulfide leach of cinnabar ore and electrolytic alkali sulfide leach. in his work he found that ocher and other iron compounds caused trouble in the leaching process by using up sulfide in forming colloidal suspensions of iron sulfide. in ores containing little iron this problem is not important. the recovery of the mercury from the leach solutions i

alkaline sulfide leach of cinnabar ore and electrolytic alkali sulfide leach. in his work he found that ocher and other iron compounds caused trouble in the leaching process by using up sulfide in forming colloidal suspensions of iron sulfide. in ores containing little iron this problem is not important. the recovery of the mercury from the leach solutions is another problem which needs considerable study sodium sulfide na2sas an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. stay upwind. keep unauthorized personnel away. keep out of low areas. /sodium sulfide, anhydrous; sodium sulfide, with less than 30% water of crystallization/ recovery of sulfur and accessory metals from a leaching 4. sodium sulfide was regenerated by reacting the h2s byproduct with the base in the catholyte. 5. lead as pbcl2 was recovered from the anode residue by brine leaching, and the other metals were recovered from the sodium salt solution as metal sulfides. 6. the barren filtrate from the metal sulfide precipitation constituted the recycled electrolyte. us4051220aa feed material comprising essentially about 35% chalcopyrite, 35% tetrahedrite, 10% pyrite, 5% sphalerite, 4% galena, 3% pyrrhotite and minor amounts of other metal sulfide values was leached with a sodium sulfide solution having a sodium sulfide concentration of about 265 grams per liter, resulting in a solution possessing 159 grams of antimony in the form of sodium thioantimonite. cyanide leaching of goldgenerally, the recovery for cyanide leaching of sulfide or refractory ores is no better than 30%, which is not a worthwhile venture. the use of alkalies such as calcium oxide, will prevent the decomposition of cyanide in solution to form hydrogen cyanide gas. method for separation of elemental sulphur and sulphide in addition, it is associated with the use of expensive and toxic reagent-hydrophilization (sodium sulfide) on the operation of disintegration in large quantities (~35 kg/t raw material for cereulide flotation). the difficulty of separation of pyrite and elemental sulfur due to the following facts. effect of pretreatment on leaching primary copper sulfide in several studies have involved pretreatment and subsequent leaching to improve mineral reaction rates. bahamonde et al. [13] studied the effect of pretreating a bornite (66.7%)-chalcopyrite (19.8%) concentrate using sodium chloride and sulfuric acid to improve copper extraction. the tested variables basic theory and optimization of gold containing antimony as sodium sulfide is easily oxidized to polysulfide and thiosulfate which have a gold leaching effect, gold would dissolve in leaching solution when extracting stibium from gold containing antimony concentrate by alkaline sulfide. the alkaline sulfide hydrometallurgical separation, recovery dissolution of elemental sulfur in sodium hydroxide is also used as a lixiviant for alkaline sulfide leaching of arsenic. the combination of sodium hydroxide and elemental sulfur results in the formation of species other than just sulfide (s-2). both in situ leachin-situ leaching (isl), also called in-situ recovery (isr) or solution mining, is a mining process used to recover minerals such as copper and uranium through boreholes drilled into a deposit, in situ. in situ leach works by artificially dissolving minerals occurring naturally in a solid state.

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arsenic removal from high-arsenic dust by naoh-na2s alkaline the optimum conditions were determined as follows: alkali material ratio 0.5, ratio of sodium sulfide to high-arsenic dust 0.2, leaching temperature 90, leaching time 2 h, liquid-to-solid ratio leaching mechanism of tetrahedrite in alkaline sulfide solutionleaching experiments were carried out to investigate the effect of changes in the initial concentration of sodium sulfide in the range of 100 250 g/l at 105 ºc in solutions containing 60 g/l naoh. the amount of solid leached was kept constant at 2.5 g which was taken from +53 µm size fraction. the application and economics of industrial alkaline leaching s 3 , a sulfide-complexed species of sodium thioarsenite in solution is formed. , sodium arsenite is also formed but the oxides generate hydroxide. the reaction is as follows: [4] dissolution of elemental sulfur in sodium hydroxide is also used as a lixiviant for alkaline sulfide leaching of arsenic. how is molybdenum extractedsodium hypochlorite leaching method: mainly used for leaching low-grade ore tailings. in the leaching process, sodium hypochlorite itself will slowly resolved oxygen, some other metal sulfides will be oxidized by sodium hypochlorite hydroxide ion, these metals will precipitate and promote the production of molybdate, molybdenum solution returned to slag. silver extraction process by using sodium sulfide from xrayleaching mercury sulfide - mineral processing metallurgy. the process parallels cyanidation for the recovery of gold and silver in many ways. the mercury sulfide (cinnabar) is dissolved in a sodium sulfide-sodium hydroxide solution and washed from the solids using counter-current decantation. how to leach gold ore with chlorination sciencingfilter the sediment out of the hcl solution using a coffee filter in a funnel or a piece of canvas. the gold is in liquid form in the hcl. add sodium metabisulphate to force the gold to become metallic gold again. the sodium metabisulphate lowers the ph of the solution, turning the gold liquid into gold powder. characterization and flotation of sulfur from chalcopyrite elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in various industrial or agricultural uses. sodium sulfidesodium sulfide. sodium sulfide is the chemical compound with the formula na2s, or more commonly its hydrate na2s·9h2o. both are colorless water-soluble salts that give strongly alkaline solutions. when exposed to moist air, na2s and its hydrates emit hydrogen sulfide, which smells like rotten eggs. sodium sulfide sigma-aldrichna 2 s is widely used as a laboratory reagent in both sulfide and non metallic mineral flotation. general description cubic crystals of sodium sulfide (na 2 s) are extremely hygroscopic in nature and discolor on exposure to air. sodium sulfide, solid (60-62 %, with crystallization waters sodium sulfide may be used in the making of colors and dyes. it can also be used in the manufacture of other chemicals, metals or in mining (ore processing) and in waste water, soil and process sludge treatment. exposure to sodium sulfide can cause severe irritation to the skin, eyes, and respiratory tract.

sodium sulfide use leaching application

challenges with elemental sulfur removal during the leaching dispersing the sulfur by surfactants and converting the sulfur to sulfate or to hydrogen sulfide is proposed. dissolving sulfur during leaching using organic solvents is examined. the role of sodium sulfide leaching and carbon dioxide precipitation to recover elemental sulfur is reviewed. us4051220aa feed material comprising essentially about 35% chalcopyrite, 35% tetrahedrite, 10% pyrite, 5% sphalerite, 4% galena, 3% pyrrhotite and minor amounts of other metal sulfide values was leached with a sodium sulfide solution having a sodium sulfide concentration of about 265 grams per liter, resulting in a solution possessing 159 grams of antimony in the form of sodium thioantimonite. chloride hypochlorite oxidation and leaching of refractory in this research, oxidation of sulfide minerals and leaching of gold from a goldbearing sulfide concentrate using chloridehypochlorite solution was investigated. the effects of calcium hypochlorite concentration, sodium chloride concentration and initial ph of leachant on changes of the slurry ph and eh were examined. sodium sulfide na2sas an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. stay upwind. keep unauthorized personnel away. keep out of low areas. /sodium sulfide, anhydrous; sodium sulfide, with less than 30% water of crystallization/ sulfide precipitation of heavy metalsit differs from others described in sections 5 and 6 of this report in that it uses relatively insoluble iron sulfide, instead of highly soluble sodium sulfite or hydrosulfide, as its source of sulfide ions for precipitation. leaching mercury sulfideleaching mercury sulfide. the process parallels cyanidation for the recovery of gold and silver in many ways. the mercury sulfide (cinnabar) is dissolved in a sodium sulfide-sodium hydroxide solution and washed from the solids using counter-current decantation. the mercury is precipitated from solution using metallic aluminum. sodium sulfidesodium sulfide is the chemical compound with the formula na 2 s, or more commonly its hydrate na 2 s·9h 2 o. both are colorless water-soluble salts that give strongly alkaline solutions. when exposed to moist air, na 2 s and its hydrates emit hydrogen sulfide , which smells like rotten eggs. a fundamental study of the alkaline sulfide leaching of gold dissolution of elemental sulfur in sodium hydroxide can also used as a lixiviant for alkaline sulfide leaching of antimony (anderson and krys, 1993). the combination of sodium hydroxide and elemental sulfur results in the formation of metastable species other than just sulfide (s2). sodium sulfidesodium sulfide is the chemical compound with the formula na2s, or more commonly its hydrate na2s·9h2o. both are colorless water-soluble salts that give strongly alkaline solutions. when exposed to moist air, na2s and its hydrates emit hydrogen sulfide, which smells like rotten eggs. some commercial samples are specified as na2s·xh2o, where a weight percentage of na2s is specified. commonly available grades have around 60% na2s by weight, which means that x is around 3. such technical (pdf) alkaline sulfide gold leaching kineticsthe conditions included a low, medium, and high range for temperature, sodium sulfide concentration, amount of elemental sulfur, and leaching time. dissolution of gold has also been shown to be