Method for pressurizing and strengthening leaching of copper smelting dust

Abstract

Provided is a method for pressurizing and strengthening leaching of copper smelting dust. After being subjected to screening, the copper smelting dust is leached at a time in a sulfuric acid system, so that oxide and sulfate in soot are dissolved to enter a primary leaching agent, therefore metal sulfide and the like are left in primary leaching residues, zinc and copper are recycled from the primary leaching agent, the primary leaching residues are then added into zinc hydroxide to be subjected to pressurized oxidation, the metal sulfide is oxidized and enters pressurized oxidation slurry, the pressurized oxidation slurry is refilled with sulfuric acid to subjected to secondary leaching, a sulfuric acid secondary leaching agent returns to a sulfuric acid primary leaching process, and lead is recycled by sulfuric acid secondary leaching residues. According to the method for pressurizing and strengthening leaching of the copper smelting dust, the leaching rate of copper and zinc in the copper smelting dust is improved by adopting a zinc hydroxide pressurized oxidation mode, the leaching rate of each of the copper and the zinc reaches 92% or over, current metal phase complexity can be effectively handled, and particularly the copper smelting dust with the high sulfide content can be handled.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of non-ferrous metallurgy, in particular to a hydrometallurgical method for strengthening leaching of valuable metals from copper soot by means of pressurized oxidation. Background technique [0002] At present, most of the copper metal in the world is produced from the pyrometallurgical process, which produces a large amount of soot. Because soot contains metals such as copper, lead, zinc, bismuth, and indium, as well as toxic elements such as arsenic and cadmium, it is considered an important secondary resource. The amount of soot produced by the copper metallurgical industry has been increasing in recent years as copper production has increased and high-grade copper mines have been depleted. In addition, environmental regulations have become more stringent. Therefore, soot disposal has become a key issue in the copper metallurgical industry. [0003] If the soot is directly return...

AI Technical Summary

Problems solved by technology

Although there are many methods for the treatment of copper soot, most of them focus on the treatment of converter soot from copper smelting, and many other studies focus on the recovery process of certain metals as a whole

However, little research has been done on the treatment of soot produced in Osmelt or bottom-blown furnaces during copper smelting

This kind of soot has a complex metal phase composition and contains a relatively high proportion of copper or zinc sulfides, so it is difficult to effectively extract copper and zinc in soot by using existing methods

Images