Method for treating arsenic in waste smelting acid by using copper slag

Abstract

The invention discloses a method for treating arsenic in waste smelting acid by using copper slag, and belongs to the field of heavy metal pollution treatment and metallurgical solid waste utilization. The method includes firstly subjecting the copper slag to drying, ball milling and magnetic separation to obtain iron-rich copper slag and other impurities; subjecting the iron-rich copper slag to high-temperature pretreatment at 500-800 DEG C; subjecting the high-temperature iron-rich copper slag to water quenching through high-speed water blowing; then drying and grinding the copper slag afterwater quenching; adding H2O2 into waste acid and mixing to perform oxidation pretreatment at 60-80 DEG C; then adding the copper slag into the waste acid after oxidation pretreatment; performing an arsenic removing reaction at atmospheric pressure under stirring; and finally performing solid liquid separation. The method achieves arsenic removal with cheap copper slag, reduces sludge storage volume in the process of waste acid treatment when compared with a traditional arsenic removal process, and achieves an effect of treating waste with a waste material. The method has characteristics of simple process operation, a low production cost and a wide market prospect.

Description

technical field [0001] The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid with copper slag, belonging to the fields of heavy metal pollution control and metallurgical solid waste utilization. Background technique [0002] my country is a major copper producer in the world. The annual discharge of copper slag exceeds 10 million tons. At present, the stock of copper slag in the country exceeds 120 million tons. Copper slag has become a large amount of industrial solid waste generated in the metallurgical industry. There are various valuable metals such as Fe, Cu and Ni in copper slag and a small amount of precious metals such as Au and Ag, among which the main minerals are iron silicate and magnetic iron oxide, and the grade of iron is generally more than 40%, much higher than 29. The average industrial grade of iron ore is 1%, but the iron utilization rate in copper slag is less than 1%. Therefore, effectively realizing the comprehensi...

AI Technical Summary

Problems solved by technology

There are various valuable metals such as Fe, Cu and Ni in copper slag and a small amount of precious metals such as Au and Ag, among which the main minerals are iron silicate and magnetic iron oxide, and the grade of iron is generally more than 40%, much higher than 29. The average industrial grade of 1% iron ore, but the utilization rate of iron in copper slag is less than 1%

[0003] Aiming at the treatment method of polluted acid, the sulfidation precipitation-neutralization precipitation process is widely used at present, which has many shortcomings; in practical application, a large amount of water treatment slag that is difficult to handle and difficult to store is produced; the water treatment slag is piled up in the environment Among them, it is not only easy to release toxic elements to pollute the environment, but also the cost of treatment is high; the hardness of the treated water is high, and it is difficult to recycle and apply; the treatment of dirty acid with copper slag is in line with the national policy of making waste from waste, and has great development prospects

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