Method for directly preparing copper sulfate and cathode copper from copper ore concentrate

Abstract

The invention relates to a method for directly preparing bluestone and cathode copper from copper concentrate. The method orderly comprises the following technological steps: sulphating roasting, water immersion, filtration, acid dipping, filtration washing, extraction, back extraction, electrodeposition and the circular utilization of local working procedures; and when products of bluestone and electrolytic copper with high purity are obtained, side products such as sulphuric acid, iron oxide red and waste residues are simultaneously generated. The method of the invention has the characteristics of low production cost, strong material adaptability, high working efficiency, low investment, simple operation, high utilization rate of copper, diversified products and easy industrialized production, etc., so that the method is suitable to exploit and apply low-grade copper ores.

Description

1. Technical field [0001] The invention relates to a method for directly producing copper sulfate and cathode copper from copper concentrate, which is suitable for mining low-grade copper ore. 2. Background technology [0002] There are three main ways to produce copper products using copper concentrate as raw material: [0003] The first method is pyrometallurgy to produce cathode copper and by-product copper sulfate, generally including roasting, smelting, blowing, refining and other processes, suitable for the application of copper concentrate with a grade of 20-30%, and this method has a large one-time investment , long process flow, high technical requirements, high energy consumption and waste gas pollution in the pyrolysis process, and with the large-scale mining of copper mines, there are fewer and fewer rich ores, which can meet the requirements of high-grade pyrometallurgy. There are fewer and fewer ore sources, which hinders the development of pyrometallurgy. ...

AI Technical Summary

Problems solved by technology

[0003] The first method is pyrometallurgy to produce cathode copper and by-product copper sulfate, generally including roasting, smelting, blowing, refining and other processes, suitable for the application of copper concentrate with a grade of 20-30%, and this method has a large one-time investment , long process flow, high technical requirements, high energy consumption and waste gas pollution in the pyrolysis process, and with the large-scale mining of copper mines, there are fewer and fewer rich ores, which can meet the requirements of high-grade pyrometallurgy. The source of ore is less and less, which hinders the development of pyrometallurgy

[0004] The second method is hydrometallurgy to produce cathode copper, mainly including copper concentrate sulfate roasting-atmospheric acid leaching-clean liquid-electrowinning process, roasting-ammonia leaching-extraction-electrowinning process, catalytic pre-oxidation leaching-extraction -Electrowinning processes, etc. are generally suitable for lower-grade copper concentrates, and these processes have a low recovery rate of copper, generally about 90%, and the highest is 94%. The productivity and metal recovery rate are low, resulting in relatively high production costs. high

Among them, scientific researchers have done a lot of experimental research work, and have continuously improved the copper leaching process and purification process, but there are still some problems: 1. Whether it is pre-roasting leaching method or direct leaching method, dilute sulfuric acid is basically used Leaching, the acidity and impurity content of the leaching solution are high, and it is difficult to obtain qualified products by direct crystallization. If the neutralization process is used to purify and remove impurities such as iron, the cost is high, the lost copper is difficult to wash and recover, and the process is complicated.

2. Due to the high concentration of copper in the leaching solution, the washing process of the leaching slag is longer, and the copper in this part of the washing water is returned to the leaching process, which greatly reduces the copper concentration in the leaching solution, which makes the equipment for evaporating and crystallizing copper sulfate a large investment and high energy consumption. High labor intensity and high operating costs

3. Due to the long-term circulation of the copper sulfate mother liquor prepared by concentrated crystallization, the accumulation of impurities is serious. In order to solve this problem, electrowinning copper removal is used to produce black copper or iron powder replacement method is used to produce sponge copper. Since these products are semi-finished products, resulting in product additional Problems such as low value and slow capital turnover also restrict the development of enterprises

[0006] In short, comparing the different processes of producing copper products from copper concentrates, the scope of application of the first two processes has limitations: pyrometallurgy is not suitable for small-scale production and low-grade copper concentrates; hydrometallurgy produces cathode copper, and the recovery rate of copper Low, not suitable for higher grade copper concentrate

Although the last type of bile copper method is suitable for higher-grade copper concentrates, there are many problems such as high equipment investment and labor intensity, high operating costs, and low added value of products.

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