Process for efficiently treating copper smelting smoke dust

Abstract

The invention relates to a process for efficiently treating copper smelting smoke dust. The process comprises the steps that copper smelting smoke dust is added with 5-50% of coke powder or / and powdered coal and 10-40% of sulfuric acid and fed into a microwave oven, microwave heating roasting is carried out in a negative pressure state, arsenic trioxide is formed from arsenic in the copper smelting smoke dust and volatilized in the form of smoke, smoke is collected and settled, and an arsenic trioxide product is obtained; roasting slag is directly leached through acidic wastewater, zinc, copper and residual arsenic in the roasting slag are leached in a leaching solution, and tin, lead and other materials enter the leaching slag; and an extractant is added into the leaching solution to extract copper, after a crude copper product is produced through electrodeposition, calcium hydroxide is added into raffinate in the oxygen introducing environment to adjust the pH value to be 7-8, arsenic is precipitated, ferric sulfate is added for deeply removing arsenic, a zinc sulfate solution is obtained, and the zinc sulfate solution is concentrated and evaporated to obtain a zinc sulfate product. Arsenic, zinc, copper, tin and lead in smoke dust are separated in steps, the recovery rate of valuable metals is high, the process flow is short, and the operation is simple, convenient, safe andenvironmentally friendly.

Description

technical field [0001] The invention relates to the technical field of processing methods for harmful fumes generated in copper smelting production. Background technique [0002] Copper smelting dust is the product of copper smelting electric dust collector treatment flue gas, which mainly contains tin, copper, lead, zinc, indium and other valuable metals, and also contains 10-20% arsenic, which is a dangerous smelting intermediate material. The main feature of this material is that there are many types of valuable metals, the content is low, and it needs comprehensive treatment. At the same time, it also contains a part of arsenic, which must be disposed of safely and should be used as effectively as possible. Efficient and selective arsenic removal and retention of valuable metals are the key to the development and utilization of this material. [0003] At present, the treatment methods of copper smelting dust mainly include wet leaching process, blast furnace smelting, s...

AI Technical Summary

Problems solved by technology

This process can comprehensively recover the valuable metal copper, but after the arsenic is leached, it is produced in the form of calcium arsenate and iron arsenate, and another arsenic-containing solid waste is formed. It is difficult to dispose of objects, and there are potential safety hazards

[0005] (2) Blast furnace smelting process: due to the low lead content in copper smelting dust, the material cannot be directly processed by blast furnace smelting process, but can only be processed by ore blending, so that silver, lead and other materials enter the metal crude lead, copper, bismuth Valuable metals such as indium and indium enter the matte, and arsenic enters the flue gas treatment system, forming an open circuit with the formation of arsenic filter cake, which also faces the problems of large processing volume and high processing cost.

This process mainly has the problems of low recovery rate of valuable metals and low quality of arsenic trioxide.

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