Copper nickel sulfide ammonium persulfate-sulfuric acid oxidation leaching method for extracting valuable metals

Abstract

The copper-nickel sulfide ammonium persulfate-sulfuric acid oxidation leaching method for extracting valuable metals of the present invention comprises the following steps: sieve the low-grade copper-nickel sulfide raw material to obtain copper-nickel sulfide mineral powder, and take ammonium persulfate and sulfuric acid raw materials in proportion , ammonium persulfate adopts one of two methods (1) after mixing all of it with sulfuric acid, mix it with mineral powder in proportion; (2) mix part of ammonium persulfate with sulfuric acid, and partly make a saturated solution; The constant temperature leaching reaction is carried out under the temperature and system pH. The saturated ammonium persulfate solution is added during the leaching process, and the leaching and filtration are completed to obtain a leaching solution. The extraction rate of valuable metal Ni in the leaching solution is 90.4-97.5%, and the extraction rate of Cu is 93.4-99.9%. The Co extraction rate is 92.7‑99.6%. This method has low leaching temperature, low concentration of sulfuric acid, less dosage, simple process flow, wide application range, ore raw materials are not limited by region, ore position, grade, etc.; the extraction rate of valuable metals is high, and there is no SO 2 emission.

Description

Technical field: [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a method for extracting valuable metals by oxidation leaching of copper nickel sulfide ammonium persulfate-sulfuric acid. Background technique: [0002] Nickel is an important strategic metal, mainly distributed in sulfide nickel ore and oxidized nickel ore resources. Among them, sulfide-type nickel ore is the main resource for nickel production because of its good quality and mature smelting technology. In recent years, with the increasing demand for nickel in the world, the mineable high-grade sulfide-type nickel ore resources are increasingly exhausted, and low-grade copper-nickel sulfide-type nickel ore has become the key development target of the nickel industry. [0003] Low-grade copper-nickel sulfide ore is a thick mixed ore zone between the primary sulfide ore lean body and the upper oxidation zone, accompanied by a large amount of coppe...

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Problems solved by technology

In order to increase the leaching rate of copper, Fan Xingxiang et al. studied the process of leaching chalcopyrite with silver ion catalysis and ammonium persulfate. The mineral powder with a particle size of -74+58 μm was reacted at 95°C for 100 minutes, and the leaching rate of copper could reach 98%. % or more, but the addition of silver ions not only increases the cost, but also causes the decomposition of ammonium persulfate to generate N 2 and SO 2 , increase recycling costs, and pollute the environment

In addition, these studies are all aimed at the study of single mineral phase minerals with extremely fine grain size, while the processing research on low-grade copper-nickel sulfide minerals with complex mineral phase composition and multi-metal coexistence has not been reported, so the oxidation of this type of minerals It is of great significance to study the efficient extraction of valuable metals by leaching

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