Oxidative pressure acid leaching method for processing purified waste residue in zinc hydrometallurgy process

A hydrometallurgy and oxygen pressure acid leaching technology is applied in the field of heavy metal smelting waste slag, nickel cobalt slag, copper and cadmium slag produced in the dissolution and recovery of zinc hydrometallurgy, and dissolving heavy metal-containing electronic waste, which can solve the cobalt recovery rate. It can improve the metal recovery rate, reduce pollution, and simplify the treatment process.
CN101550485AActive Publication Date: 2009-10-07INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2009-10-07

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Abstract

The invention relates to an oxidative pressure acid leaching method for processing the purified residue generated in the zinc hydrometallurgy process. The method comprises the following steps: the copper-cadmium residue generated during the copper-cadmium removal and the nickel-cobalt residue generated during the nickel-cobalt removal is replaced, i.e., the residue from the purification of zinc is leached with sulfuric acid in an acid-resistant high pressure autoclave under the condition that the high-pressure oxygen is introduced in. Compared with the commonly-used direct acid solution method, the method has the advantages of high leaching rate, high processing speed, no poisonous and harmful gas and iron removal during the leaching process, and the like, can obviously improve the prior process conditions, reduce the pollution andthe production cost and also provides a new method for processing the other waste residues containing heavy metal.
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Description

technical field

[0001] The invention relates to oxygen pressure acid leaching for dissolving heavy metals in purified slag produced in zinc hydrometallurgy, and is especially suitable for dissolving and recovering copper-cadmium slag and nickel-cobalt slag produced in zinc hydrometallurgy, and can also be used for dissolving heavy metal-containing slag Electronic waste and other heavy metal smelting waste. Background technique

[0002] The zinc hydrometallurgy process is mainly composed of several steps such as mineral roasting to produce calcined sand, sulfuric acid leaching of calcined sand, and electrowinning of leaching solution to produce metal zinc. Since the zinc sulfide ore used is often associated with other metals such as copper, cadmium, and cobalt etc. Therefore, the leaching solution also contains these impurity ions in addition to zinc. In order to ensure the smooth progress of the electrowinning process of metal zinc in the future, it is necessary to remove im...

Claims

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