31results about How to "Achieving selective leaching" patented technology

The invention discloses a method for comprehensively recovering copper and indium from lead matte. The method comprises the following steps: A, crushing lead matte block materials and then ball-milling to obtain lead matte powder; B, leaching the lead matte powder obtained by ball-milling in an autoclave by using sulfuric acid and continuously introducing oxygen in the leaching process; C, after leaching, carrying out solid-liquid separation to obtain leaching residues and leachates containing copper ions and indium ions; D, selectively extracting the copper ions in the leachates by using ZJ988, obtaining copper sulfate enrichment liquid by using a sulfuric acid-copper sulfate solution to perform reverse extraction on loaded organic phase, taking the copper sulfate enrichment liquid as an electrolyte of electro-deposit copper and obtaining cathode copper through a copper sulfate electro-deposition process; E, selectively extracting the indium ions by using P204, then obtaining indium chloride enrichment liquid by using a hydrochloric acid solution to perform reverse extraction on the loaded organic phase and replacing the indium chloride enrichment liquid by using a zinc plate or an aluminum plate to obtain sponge indium. The method has the benefits that the complete separation of the copper from the indium in the lead matte is realized, recovery rate of the valuable metal is high, and the environmental friendliness is realized.

The invention discloses a method for extracting cobalt and copper from cobalt-copper-iron alloy, and relates to a method for preparing electrical copper and high-purity cobalt salt from high-silicon cobalt-copper-iron alloy serving as a raw material. The method is characterized by comprising the following steps of: (1) levigating the alloy; (2) performing acid leaching on the levigated alloy under the conditions of heating, pressurizing and introducing oxygen; (3) filtering leached ore pulp, and washing leached residue; and (4) recovering copper from leachate by adopting an extraction-electrodeposition process, removing impurities from copper raffinate, and extracting the cobalt and nickel. The method has the advantages that: the pressure leaching is low in temperature, the consumption of a reagent is low, the selectivity is high, the leaching rate of valuable metals is high, most iron is inhibited in the residue, the leached ore pulp has high filter performance, the harmful impurity of silicon is totally solidified in the iron residue, and the method is an environment-friendly process which is easy to implement.

The invention discloses a two-stage selective heterogenite leaching method which is characterized by including the steps: (1) grinding: crushing and finely grinding heterogenite to enable 80% or more reaches the granularity of 200 meshes; (2) leaching copper at the primary stage: mixing 80% or more of the heterogenite with the granularity of 200 meshes and water to prepare 33% of ore pulp, adding sulfuric acid into the ore pulp, leaching for 0.5h-2.5h at the normal temperature, and performing solid-liquid separation after reaction is finished to obtain leaching liquid and copper leaching residues; (3) leaching cobalt at the secondary stage: mixing the copper leaching residues leached at the primary stage and sulfuric acid aqueous solution to prepare 20% of ore pulp, adding 1-2 times of iron powder into the ore pulp according to theoretical quantity, performing reaction at the temperature ranging from the normal temperature to 85 DEG C, mixing for 0.5h-3h, and performing solid-liquid separation after leaching is finished to obtain cobalt-rich leaching liquid and leaching residues. The addition of the sulfuric acid is equal to 10%-25% of the heterogenite by mass fraction, and the concentration of the sulfuric acid aqueous solution is 10g/L-30g/L.

The invention discloses a method for preparing nickel sulfate by ordinary-pressure decomposed high ice nickel. The method for preparing the nickel sulfate by the ordinary-pressure decomposed high icenickel comprises the following steps that (1) the high ice nickel is crushed and added into a 4-10 mol/L concentrated sulfuric acid solution, solid-liquid separation is carried out after reaction to obtain filter residues and filter liquor, and the obtained filter liquor is refilled to the concentration of sulfuric acid of 4-10 mol/L to return to ordinary-pressure decomposition of the high ice nickel; and (2) filtration washing is carried out after size mixing and stirring are carried out on the filter residue to obtain the filter liquor containing nickel, iron and cobalt and the cooper-bearing filter residue, the cooper-bearing filter residue is used for smelting cooper, and the filter liquor containing the nickel, the iron and the cobalt is returned to perform size mixing on the filter residue obtained in the step (1); and when the Ni<2+> concentration in the filter liquor containing the nickel, the iron and the cobalt is greater than or equal to 90g/L, evaporative crystallization iscarried out after neutralization deironing and extraction cobalt removal are carried out to obtain a nickel sulfate crystal. According to the method for preparing the nickel sulfate by the ordinary-pressure decomposed high ice nickel, selective leaching of the nickel and the cobalt in the high ice nickel can be realized under the ordinary pressure condition, the cooper exists in leaching residuein a sulfide form of the cooper, and the nickel and cooper separation in the high ice nickel is realized.

The invention relates to a treatment method of high-palladium high-tin high-copper regenerated tin anode slime. The method comprises the following steps of (1) pre-leaching; (2) pressurized oxidationleaching; (3) precipitating silver; (4) separating gold; (5) separating silver; and (6) smelting in a tin-lead antimony-fire method. According to the treatment method, the copper and nickel in the high-palladium high-tin high-copper tin anode slime are effectively and selectively leached into the copper removal liquid, so that a cathode copper and nickel sulfate product can be obtained, the loss of silver in the pressurized oxidation leaching working sequence is effectively reduced through the silver precipitation operation, gold, silver and platinum and palladium are separated can be realizedthrough 'gold separation-silver separation' process, and tin and lead-antimony alloy products can be obtained by smelting through the tin-lead antimony-fire method. According to the treatment method,automatic control is easy to realize, effective separation and recovery of copper-nickel, tin-lead and antimony and noble metals can be realized, the whole process can realize closed-loop circulationof the smelting system, without emission of three wastes, and has the characteristics of good environmental effect, good economical efficiency and the like.

The invention provides a method for recovering molybdenum from a waste nickel-molybdenum catalyst. The method comprises the following steps: (1) hydrogen peroxide and the waste nickel-molybdenum catalyst are mixed, and one-step reaction is carried out to obtain a leachate; and (2) ammonia water is added into the leachate obtained in the step (1) for a second-step reaction, then ammonia water is added for a third-step reaction, and molybdenum-containing filtrate is obtained after filtration. The method provided by the invention has the advantages of low temperature, no need of using a pressurized reactor, simple operation and low equipment investment. The produced ammonium molybdate solution can be recovered using conventional methods.

The invention provides a method and device for selectively leaching scandium from laterite nickel ore smelting slag. The method comprises the steps of mixing the laterite nickel ore smelting slag andan aqueous solution of a first ore phase refactoring agent to obtain refactoring mineral acid, wherein the first ore phase refactoring agent includes acid; carrying out intermediate-temperature roasting on the refactoring mineral acid to obtain an intermediate-temperature roasted product, wherein the temperature of the intermediate-temperature roasting process ranges from 500 DEG C to 800 DEG C; and washing the intermediate-temperature roasted product to obtain leaching liquid with scandium. With the treatment method, the pyrogenic decomposition process of the scandium element can be restrained through the ore phase refactoring process, and then the purpose of selectively leaching the scandium element from the laterite nickel ore smelting slag can be achieved.