Method for extracting copper for copper containing sulfurized ore

Abstract

The method for extracting copper from copper-bearing sulfide mineral is characterized by leaching copper-bearing mineral under the condition of introduction of oxygen and in the presence of sulfuric acid and chlorine ion, the liquid-solid ratio of leaching-out liquor is 1-8:1, primary concentration of sulfuric acid is 5-70 g / L, leaching total pressure is 200-1000 kPa, partial pressure of oxygen is 100-800 kPa, temp. is 100-130 deg.C and time is 1-4 hr. The leaching temp. and pressure of said method are low, its selectivity is good, the pyrite can not be oxidated, and the harmful impurity, for example arsenic, can be solidifed in arsenic-ion slag, so that it is a process friendly to environment.

Description

(1) Technical field [0001] A method for extracting copper from copper-containing sulfide minerals, relating to a method for extracting copper from copper-containing sulfide minerals or concentrates by pressure leaching, especially suitable for extracting copper-containing sulfide minerals or refractory copper-containing minerals, Such as the process of extracting copper from chalcopyrite, arsenic-containing copper sulfide ore, and copper-zinc mixed sulfide ore. (2) Background technology [0002] So far, pyrometallurgy still occupies a dominant position in the copper industry, especially for copper concentrates with chalcopyrite as the main mineral, ore dressing and pyrometallurgy are still the only industrialized technical routes. Although in recent years, the world's copper smelting technology has made great progress, flash smelting and various molten pool smelting technologies have basically replaced the traditional blast furnace, reverberatory furnace and electric furnace...

AI Technical Summary

Problems solved by technology

However, the following major problems still exist in pyrometallurgy: 1) In order to reduce the investment cost and operating cost of unit product, the scale of copper smelting plants is very large now, and it is necessary to transport the concentrate from other ore-producing places, even from abroad, so it is necessary to Pay the freight of the concentrate, and also bring the metal loss caused by the concentrate during the long-distance transportation; 2) The flue gas SO produced by the pyrometallurgy plant 2 and soot must be processed at a lot of cost, and often cause environmental pollution problems; 3) SO produced by most pyrometallurgical plants 2 Flue gas is used to produce sulfuric acid, and now the global problem of excess sulfuric acid has become increasingly serious; 4) Pyrochemical copper smelting has clear requirements on the grade and impurity content of copper concentrate, and copper with low grade or unqualified impurities cannot be treated alone Concentrate

However, recent studies have shown that these dispersants will decompose quickly and do not work at a leaching temperature of 150°C.

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