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.

Active Publication Date: 2009-10-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In terms of zinc replacement slag treatment, there are many domestic reports. Generally, direct acid leaching is adopted, and selective leaching is carried out by controlling the acidity. During the leaching process, severe Toxic arsine gas, there is a patent that use...

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Copper-cadmium slag produced in zinc hydrometallurgical purification process, containing 10% copper, 15% cadmium, 20% zinc, 0.1% cobalt, and 6% iron.

[0021] Crush the massive slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen until the gauge pressure is 0.4MPa, stir and heat up to 120°C, and keep warm React for 120min.

[0022] The leaching rates of copper, zinc and cadmium are all over 99.5%, the residual copper content in the slag is less than 0.2%, and the iron content in the leaching solution is less than 0.1g / L. It is possible to directly separate and extract valuable metals without iron removal.

Embodiment 2

[0023] Example 2: The nickel-cobalt slag produced in the hydrometallurgical purification process contains 40% zinc, 0.1% cadmium and cobalt, and 6% iron.

[0024] Crush the slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen to a gauge pressure of 0.4MPa, stir and heat up to 120°C, and keep warm for reaction 120min.

[0025] The leaching rates of zinc, cadmium and cobalt are all over 99.9%, the total content of residual zinc, cadmium and cobalt heavy metals in the slag is less than 0.1%, and the iron content in the leaching solution is less than 0.1g / L. It is possible to directly separate and extract valuable metals without iron removal.

Embodiment 3

[0026] Example 3: Copper-cadmium slag produced in zinc hydrometallurgical purification process, containing 11% copper, 12% cadmium, 26% zinc and 7% iron.

[0027] Crush the massive slag, grind it to -100 mesh, add water to adjust the slurry, put it into a 2L titanium-lined autoclave, add 300g / L sulfuric acid, and seal it; introduce industrial oxygen until the gauge pressure is 0.2MPa, stir and heat up to 130°C, and keep warm React for 150min.

[0028] The leaching rates of copper, zinc and cadmium are all above 99.5%, the residual copper content in the slag is less than 0.1%, and the iron content in the leaching solution is less than 0.1g / L.

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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.

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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Application Information

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IPC IPC(8): C22B3/08
CPCY02P10/20
Inventor 张广积韩宝玲方兆珩杨超禹耕之毛在砂
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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