Method for efficiently separating copper arsenic in arsenic matte

Abstract

The invention belongs to the field of chemical engineering, and discloses a method for efficiently separating copper arsenic in arsenic matte. The method includes the steps: (1) crushing the arsenic matte, grinding the crushed arsenic matte, and screening the grinded arsenic matte to obtain arsenic matte powder; (2) oxygen pressure leaching: performing oxygen pressure leaching on the arsenic mattepowder by the aid of sulfuric acid solution and Cu2<+> ions, and performing liquid solid separation after leaching is completed to obtain copper-containing leaching solution and lead-silver-containing leaching slag; (3) depositing the copper arsenic in the leaching solution, and performing alkaline leaching on copper arsenic slag to obtain alkaline leaching copper slag and high-arsenic-containing alkaline leaching solution; (4) fine lime arsenic depositing: adding fine lime into the alkaline leaching solution acquired in the step (3) to deposit the arsenic to obtain calcium arsenate. The method is simple in process and free from pollution, a works can not directly contact with harm of generated arsenide hydrogen in the production process, environments cannot be polluted, and precious metals such as copper, lead and silver in lead matte can be effectively recycled.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to wet treatment of arsenic matte, in particular to a method for efficiently separating copper and arsenic from arsenic matte. Background technique [0002] In the process of lead fire smelting, lead matte is often produced in the process of processing lead dross, and the output rate of matte is 0.5-2% of that of crude lead. Usually, we call lead matte with relatively high arsenic content It is called arsenic matte, and the arsenic content of arsenic matte is generally between 5% and 15%, and the copper content is also relatively high. Arsenic matte is an intermediate product with high value. It contains high content of copper, lead, gold, silver and other precious metals, but it also contains arsenic as an impurity element that is difficult to handle. How to remove arsenic from arsenic matte has become an industry difficulty. [0003] At present, there are many studies on the treatm...

AI Technical Summary

Problems solved by technology

The main process of pyroprocessing is to blow smelting matte copper to obtain blister copper, and then further refining to obtain refined copper. However, the pyroprocessing process has serious problems such as large environmental pollution, long process flow, high operating cost and low metal recovery rate.

In order to make up for these deficiencies, researchers turned their attention to the wet treatment process. At present, there are two schemes for wet treatment, acid leaching and alkali leaching. For example, the 2011 Chinese Invention Patent Publication No. CN201110191860. 3 -(NH 4 ) 2 SO 4 Oxygen pressure leaching of arsenic matte in a weak alkaline composite system at a temperature of 110-200 ° C, copper and NH 3 Coordination chemical reaction occurs to enter the solution to separate copper; but more is the method of using sulfuric acid acid leaching arsenic matte, such as the 2014 Chinese Invention Patent Publication No. CN201410595856.8, CN201410519503.X and the 2015 Chinese Invention Patent Publication No. CN201510252217.6 all use sulfuric acid solution to leaching arsenic matte copper, but the specific operations and conditions are different, and the content of each element in the leachate is also very different, which also directly affects the purification of the leachate and the copper electrowinning section For the treatment of copper sulfate leaching solution with high impurity content, there is currently a technology to electrolyze copper by using swirl electrolysis. This technology has relatively low requirements for arsenic content and other impurity elements in the solution, and can adapt to a wide range of copper sulfate electrolysis. Liquid is a well-developed technology at present, but for most copper electrowinning enterprises, most of them still use the traditional copper sulfate electrolysis process and equipment, and it takes several thousand dollars to build a set of swirl electrolysis equipment. 10,000, it is difficult for many small and medium-sized enterprises to afford this cost at once, and the old equipment and processes in the enterprise can be used temporarily so they will not be eliminated at once, which requires that the impurities in the copper sulfate leaching solution should be as small as possible to meet our requirements. Old copper electrowinning production line

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