Method for treating arsenic pollution of copper smelt industry

Abstract

The invention provides a method for controling arsenic pollution in the copper metallurgy industry, is characterized in that arsenic acid filtering case is added as vulcanized agent in sulphuric acid extract of copper metallurgy smoke to precipitate copper, copper slag and the solution containing copper are obtain by separation; the solution containing copper is contracted to 60-100 g / l of arsenical concentration and then cooled to the room temperature, heptahydrate zinc sulphate and crystal mother liquor are obtained after separation; sulfur dioxide is added to crystal mother liquor, thereby arsenic is dissolved out in the form of arsenic trioxide, arsenic trioxide and the solution after precipitating arsenic are obtained after separation, the solution after precipitating arsenic is back to smoke extract. The separature of the main component such as copper, arsenic, zinc and cadmium is performed in sulphuric acid extract of copper metallurgy smoke and arsenic acid filtering case with an objective for controling arsenic pollution economically and effectively, while provided with an advantage for further recycling valent metal synthetically.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy and environmental protection, in particular to a method for controlling arsenic pollution in copper smelting industry. Background technique [0002] The pollution control of arsenic in the copper smelting industry has long been valued by people. The smelting smoke and sulfuric acid produced in the copper smelting process contain copper, arsenic, zinc, cadmium, lead, bismuth and other metals, among which the arsenic content accounts for more than 50% of the total arsenic content in the whole copper smelting process. With the development of copper smelting technology The continuous progress of the smelting process, the continuous improvement of the removal capacity of the smelting process, and the increasingly tight supply of copper raw materials, so the content of arsenic and other volatile metals in copper smelting fume and sulfuric acid will show an increasing trend. [0003] In the prio...

AI Technical Summary

Problems solved by technology

[0005] For the treatment of sulfuric acid polluted acid, the "neutralization-iron salt oxidation method" is more economical, and the wastewater can be discharged up to the standard, but the neutralization slag produced has secondary pollution due to the possible redissolution of arsenic, and requires a large amount of land for storage resources, if the pollution of heavy metals contained in them is considered together, the potential threat to the environment will be even greater; the "sulfurization method" can achieve significant environmental and social benefits, but there are problems with high processing costs and outlets for arsenic filter cakes

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