Valuable metal separation method of complex copper-lead-zinc-silver mixed concentrate

Abstract

The invention relates to a valuable metal separation method for complex copper, lead, zinc and silver mixed concentrates and belongs to the technical field of metal separation and recovery. The method disclosed by the invention comprises four steps, namely carrying out thermal activation, carrying out oxidizing leaching, separating copper, lead, silver and zinc, and replacing copper and settling zinc. The method disclosed by the invention is wide in practicability and is applicable to the separation of a variety of polymetallic mixed concentrates; due to the realization of the method disclosed by the invention, polymetallic ores need mixed separation only and do not need sorting, so that mine enterprises have no need of sorting equipment, sorting sites and the like, the investment is reduced by about 30%, the production cost is reduced by 20%, the waste of mineral resources is lowered, the ore dressing recovery percentage is increased by over 25%, the cycle is shortened by 1 / 3, workers are reduced by 1 / 3, and the power consumption is lowered by 1 / 3. Meanwhile, compared with the present processes at home and abroad, the method has the advantages of small investment, short production cycle, high valuable metal recovery rate and easiness in popularization and application.

Description

technical field [0001] The invention belongs to the technical field of metal separation and recovery, and in particular relates to a new method for separating valuable metals from complex copper-lead-zinc-silver mixed concentrates. Background technique [0002] There are a large number of polymetallic ores of copper, lead, zinc and silver in Sichuan, Xinjiang and other places in my country, the Sanjiang area of ​​Yunnan, the Lanjiang River Basin, and the Mekong River Basin in Myanmar and Laos. There are two kinds of process routes for the comprehensive utilization of such polymetallic complex deposits. The first is separation and smelting, that is, lead concentrate, zinc concentrate and copper concentrate are selected through ore dressing, and then processed separately to extract lead, zinc and copper. The difficulty of this process is beneficiation. Due to the difficulty of sorting, not only the recovery rate of ore dressing is low, but also the mutual content of lead, zinc...

AI Technical Summary

Problems solved by technology

[0021] (2) The process of using chlorine salt as immersion aid, Cl - Although the presence of sulfur can improve the permeability of the sulfur film and facilitate the oxidation and dissolution of minerals, so that the direct pressure acid leaching process can be carried out at a lower temperature, acidity and pressure, but the Cl - The existence of will affect the subsequent electrowinning, and will seriously corrode the metallurgical equipment

[0022] (3) To obtain a better leaching rate, especially to increase the leaching rate of copper, ultra-fine grinding is required, resulting in increased grinding energy consumption

[0023] (4) During the reaction process, the elemental sulfur generated by the system will cover the surface of the mineral particles, hindering the migration of the solvent to the surface and the diffusion of the product from the surface to the main solution, affecting the progress of the reaction

[0026] The use of bioleaching technology has a good cost advantage, but for the long working cycle, low leaching rate, and the biological community is greatly affected by environmental factors, further research needs to be further strengthened and effectively resolved.

At present, there is no report on the separation process of complex copper, lead, zinc and silver concentrates

[0027] To sum up: ①Using chlorination leaching, the existence of chloride ions will not only affect the connection of subsequent processes, but also easily corrode equipment and pollute the environment; In addition, the presence of ammonia also puts forward higher requirements on both the working environment and the natural environment; ③The use of roasting and acid leaching has a long process flow and low concentration of SO produced in the roasting process. 2 Weaknesses that gas is difficult to recover; ④The use of bioleaching has disadvantages such as long working cycle, low leaching rate, and the biological community is greatly affected by environmental factors.

⑤The direct pressurized acid leaching process requires higher temperature, pressure, and sulfuric acid concentration, and the required sulfur will cover the surface of the mineral particles, which will affect the progress of the reaction.

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