摘要:
A method for separating arsenic and heavy metals in an acidic washing solution which contains both arsenic and heavy metal, more particularly in a washing solution which is formed in copper smelting and contains sulphuric acid, comprises a separation process section, in which arsenic and at least one primary heavy metal are separated from one another. The separation process section comprises a processing step, in which hydrogen peroxide H2O2 is added to the washing solution, and the separation process section comprises a precipitation stage, in which the washing solution is admixed with a sulphide precipitation reagent, causing the at least one primary heavy metal to precipitate in the form of a metal sulphide. The processing step in this system is carried out before the precipitation stage.
摘要翻译:一种在含有砷和重金属的酸性洗涤液中分离砷和重金属的方法,特别是在以铜冶炼形成并含有硫酸的洗涤液中,特别包括分离工艺段,其中砷和至少 一个主要的重金属彼此分离。 分离方法部分包括其中将过氧化氢H 2 O 2加入到洗涤溶液中的处理步骤,并且分离工艺部分包括沉淀阶段,其中洗涤溶液与硫化物沉淀试剂混合,使得至少一个初级 重金属以金属硫化物的形式沉淀。 该系统的处理步骤在沉淀阶段前进行。
摘要:
Provided is a method of recovering copper and one or more precious metals comprising leaching copper-bearing ore and/or concentrate under atmospheric or slightly pressurized conditions at a temperature below the boiling point of the leach solution in a sulfuric acidic solution in the presence of one or more alkali metal or alkali earth metal halides, whereby the total halide concentration is from 30 to 115 g/L, to dissolve copper and to obtain a leaching liquor comprising copper, sulfur species, and halides in solution. The leaching liquor is then subjected to a solid-liquid separation after which a first aqueous pregnant leach solution and a copper depleted leaching residue are obtained. Copper is purified by solvent extraction from the first aqueous pregnant leach solution to obtain a first copper-containing loaded organic solution and a first aqueous raffinate. The copper containing loaded organic solution is stripped and copper is recovered.
摘要:
The invention relates to a mixing reactor for mixing a liquid and pulverous solid, clarification the solution that is formed and discharging the clarified solution from the mixing reactor, in the lower section of which a fluidized bed is formed. The invention also relates to a method for mixing a liquid and pulverous solid into each other in a fluidized bed, for clarification the solution that is formed and for discharging the clarified solution from the mixing reactor.
摘要:
It is an object to provide a copper-containing tin powder having excellent capabilities in forming fine wiring circuits and filling via holes with ability in bond by melting at a low temperature. In order to achieve the object, it is produced from a copper powder as a starting material by a wet substitution process and it contains remainder of copper un-substituted at 30% by weight or less. The change rate of properties of the copper-containing tin powder, e.g. an average primary particle size or the like is in the range from −20 to +5% with respect to the starting copper powders. The copper-containing tin powder is produced by a wet substitution process in which a copper powder is brought into contact with a plating solution for tin substitution to make copper component constituting the copper powder dissolve with simultaneous substituted deposition of tin.
摘要:
A method for recovering metals from solutions is described. A particular embodiment of the method concerns recovering copper metal. The method comprises first treating a solution containing copper ions with a sufficient amount of an inorganic acid to obtain a solution pH of from about 1.5 to less than about 2.5. A reducing metal, such as iron, is then added to the solution to precipitate metal ions, such as copper ions, as metals. The reducing metal has a mesh size preferably smaller than about 350, and even more preferably at least as small as about 400 mesh. The metal precipitate is recovered from solution.
摘要:
A process for winning copper and zinc from brass mill waste products containing oxidic copper and zinc, iron, nickel, or cobalt. The feed material is leached in sulfuric acid, neutralized to a pH between about 2.5 and 3.0, and treated with zinc metal to precipitate copper. After separation of the copper product, residual copper as well as iron and cobalt are removed in a second, oxygen-free, cementation on zinc metal. The liquor is then raised to about pH 4.0 or greater and flushed with oxygen to precipitate iron. Lastly, the purified electrolyte is subjected to zinc electrowinning wherein acceptably pure zinc cathode is produced and sulfuric acid is regenerated.
摘要:
A process for extracting copper from a copper bearing ore or concentrate which comprises immersing the ore or concentrate in an electrolyte, intimately mixing with the slurry so formed finely dispersed air or other oxygen containing gas and maintaining the pH of the mixture at between 1,5 and 7,0 throughout the process. Iron is solubilized in the process and precipitated as ferric oxide and the copper is taken into solution. The process is conducted at substantially atmospheric pressure and at temperatures of from 50.degree. C to the boiling point of the electrolyte. The electrolyte is acidic and contains chloride ions in a concentration between that sufficient to maintain in solution any cuprous ions present and saturation.
摘要:
A process and apparatus for recovering copper values from acidic solutions containing dissolved copper is disclosed. The process and apparatus comprises reacting in an intake line and feed pump powdered iron in the size range of up to -40 mesh with the solution to displace the copper therefrom as metallic copper, and separating the copper from the solution by settling the metallic copper in the bottom of a vessel known as a polishing tower. Preferably, the solution is clarified by passing it upwardly through a bed of scrap iron, after which the solution is centrifuged to remove particles therefrom.
摘要:
Chalcopyrite is decomposed by treatment with aqueous acid solution and a metallic reductant to form either metallic copper or copper sulfide, ferrous iron and hydrogen sulfide.
摘要:
Precipitating copper metal from copper bearing solutions using scrap iron as a precipitant to form free copper metal precipitate. The scrap iron is retained in an unflooded bed in a container having a rotatable nozzle for spraying the copper bearing solution in a high velocity jet stream which penetrates into the bed to react with the iron to form copper and strips off the copper metal from the scrap iron. In the bottom of the container is a sieve for retaining the scrap iron while withdrawing the copper metal and the expended solution.