Method for recovering copper, zinc and nickel from heavy metal sludge by using copper smelting waste acid

Abstract

The invention relates to a method for recovering copper zinc nickel from heavy metal sludge by using copper smelting waste acid, which comprises the following steps: 1)leaching; 2)purifying and removing impurity; 3)extracting copper and electrically depositing copper; 4)neutralizing and removing iron; %)extracting zinc, neutralizing and purifying a zinc strip liquor, and electrically depositing zinc; 6)extracting nickel, electrically depositing nickel; and depositing alkali. According to the invention, valuable metals such as copper, zinc and nickel can be recovered step by step from the heavy metal sludge by using the copper smelting waste acid, the comprehensive recovery can reach 97%, the sewage and sludge can reach a discharge standard, and the obtained product can be directly taken as a raw material of the copper material for reuse. According to the method, the localization treatment of the dangerous waste can be realized, and the method and has economic, environmental and social benefits and wide application prospect.

Description

technical field [0001] The invention relates to a method for recovering copper, zinc and nickel metals from heavy metal-containing sludge by using copper smelting waste acid. Background technique [0002] During the copper production process, some metal-containing dust and compounds will enter the circulating water system and finally accumulate in the water treatment sludge. Heavy metals in sludge exist in the form of hydroxides, which can easily enter the soil and water bodies. Improper storage will affect the surrounding environment and cause secondary pollution. At the same time, a large amount of valuable metals such as copper, zinc, and nickel are also lost, causing resource pollution. waste. With the shortage of metal resources and the emphasis on environmental issues, more and more attention has been paid to the recycling of waste. [0003] The copper smelting waste acid produced in the copper smelting process also faces the same problems of metal loss and environme...

AI Technical Summary

Problems solved by technology

This treatment method has the following four problems: (1) Deep decopper and nickel concentration and precipitation need to consume a lot of electricity and heat energy

(2) The obtained black copper and crude nickel sulfate have high impurity content and can only be treated as cheap raw materials, and the metal value is often not well reflected

(3) The concentrated waste acid can only be treated cheaply as a low-priced acid, and a large amount of valuable metals in it cannot be effectively utilized

(4) The handling process will also inevitably have an impact on the environment

[0004] CN103422119A discloses "a method for producing cathode copper from copper-containing sludge", and CN1837381A discloses "an efficient process for extracting fine nickel from waste electrolyte". These methods only carry out metal extraction and refining for a single waste, using The comprehensive utilization of multiple metals recovered step by step from copper smelting waste acid from metal sludge has not been reported

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