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Method for recycling zinc, copper and cadmium from zinc hydrometallurgy copper-cadmium residues

A technology for hydrometallurgical smelting of zinc and copper-cadmium slag, applied in the fields of copper, zinc and cadmium recovery, can solve the problems of cumbersome pyrometallurgical recovery process, reduced recovery rate of metal zinc and cadmium, unfavorable copper smelting stability, etc. Value, improve the efficiency of electrolysis, the effect of low production cost

Inactive Publication Date: 2017-10-24
贵州省兴安环保科技有限公司
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Problems solved by technology

[0002] Zinc-copper-cadmium slag from hydrometallurgy is a difficult metallurgical waste residue, its composition is zinc sulfate, excess zinc powder, sponge copper, cadmium wrapped zinc powder, cadmium sulfate, sponge cadmium, sponge copper, Fe 2+ , Fe 3+ , Mn 2+ At present, there are many recovery methods for zinc, cadmium and copper. Among them, the recovery of zinc and cadmium by fire method matches the original zinc hydrometallurgy process and is widely used, but repeated replacement and precipitation are required in the recovery process- Dissolution and replacement-washing and other operations, and the entrainment and dispersion of copper slag also reduces the recovery rate of metal zinc and cadmium. Due to the large difference in properties of copper, zinc and cadmium in the leaching residue, when entering the copper smelting system, the smoke layer will be The content of zinc and cadmium in medium is high, which is not conducive to the stability of copper smelting. Therefore, the entire recovery process of pyrometallurgy is relatively cumbersome, and the recovery rate is not high; hydrometallurgy uses dilute sulfuric acid to leach zinc, and the leaching solution is oxidized again to leach copper, cadmium, and copper. Carry out extraction and separation. When this method is leached with dilute sulfuric acid, a small amount of copper and cadmium are also leached. The leaching solution must be purified before entering the electric zinc system, which will produce new copper cadmium slag. The second step of oxidation leaching, due to the leaching of zinc in the first step Not fully leached, still have zinc, copper, cadmium to enter solution, must carry out copper, cadmium, zinc separation again, so this method zinc, copper, cadmium dispersion is not conducive to separation and recovery, simultaneously has new copper cadmium slag to produce, and The process is long and the cost is high; through long-term research and exploration, the present invention overcomes the disadvantages of the above-mentioned fire method and wet process for copper cadmium slag treatment, and achieves the purpose of short process, low pollution and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Under the conditions of 100g / L sulfuric acid, 5% hydrogen peroxide, liquid / solid=4, and 80°C, the copper-cadmium slag containing 25% zinc, 5% cadmium, and 0.3% copper was leached once to obtain a leach solution containing 82.5g / L zinc, cadmium 15.2g / L, copper 750mg / L, sulfuric acid 52.1g / L, Fe 3+ 1.2g / L, neutralize with milk of lime until the pH value is 4.5 and filter to obtain a neutralized solution containing 80.7g / L zinc, 14.5g / L cadmium, 720mg / L copper, and Fe2 , 25°C, electrolysis of zinc-copper-cadmium alloy under the conditions of electrolyte circulation rate 1.5L / h; electrolysis time 24 hours, current efficiency 81.3%, electrolytic raffinate contains zinc 43.5g / L, cadmium 0.2g / L, copper trace , sulfuric acid 120g / L; the alloy obtained by electrolysis contains 92.5% of zinc, 7.1% of cadmium, 0.25% of copper, 0.15% of lead, iron, arsenic and antimony in total.

Embodiment 2

[0028] Carry out pressure with the copper cadmium slag of example 1 in sulfuric acid 150g / L, liquid / solid=3, 150 DEG C of conditions and be 7.5kg grade high-pressure oxygen leaching, obtain the first grade leach solution containing zinc 95.3g / L, cadmium 16.5g / L, Copper 872mg / L, Fe 3+ 1.5g / L, neutralized with lime to pH 4, and obtained a neutralized solution containing zinc 92.1g / L, cadmium 15.8g / L, copper 850mg / L, Fe<100mg / L, filtered and pressed at a tank pressure of 3.5 V, current density 500A / m2, 35°C, electrolysis of zinc-copper-cadmium alloy under the conditions of electrolyte circulation speed 2L / hour, to obtain zinc-copper-cadmium alloy containing 90.5% zinc, 8.2% cadmium, 0.3% copper, lead, iron, The total of arsenic and antimony is 1%.

Embodiment 3

[0030] Oxidative leaching is carried out according to the conditions of Example 1, and the secondary leaching solution is returned to the primary leaching to obtain a leaching solution containing 102g / L of zinc, 18.2g / L of cadmium, 970mg / L of copper, and 970mg / L of Fe. 3+ 1.8g / L; Lime milk is neutralized and electrolyzed to obtain a zinc-copper-cadmium alloy containing 93.5% zinc, 5.2% cadmium, 0.42% copper, and a total of 0.78% lead, iron, arsenic, and antimony.

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Abstract

The invention belongs to the technical field of hydrometallurgy and particularly relates to a method for recycling zinc, copper and cadmium from zinc hydrometallurgy copper-cadmium residues. According to the method, recycling of the zinc, the copper and the cadmium is completed through the seven steps of oxygen pressure leaching, neutralization iron removal, electrolysis, vacuum distillation, separation, copper-rich residue treatment and electrolysis residual liquor treatment. The whole technological process is short, the amount of waste residues and waste water is small, the environmental pollution is less, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for recovering zinc, copper and cadmium from copper-cadmium slag of zinc hydrometallurgy. Background technique [0002] Zinc-copper-cadmium slag from hydrometallurgy is a difficult metallurgical waste residue, its composition is zinc sulfate, excess zinc powder, sponge copper, cadmium wrapped zinc powder, cadmium sulfate, sponge cadmium, sponge copper, Fe 2+ , Fe 3+ , Mn 2+ At present, there are many recovery methods for zinc, cadmium and copper. Among them, the recovery of zinc and cadmium by fire method matches the original zinc hydrometallurgy process and is widely used, but repeated replacement and precipitation are required in the recovery process- Dissolution and replacement-washing and other operations, and the entrainment and dispersion of copper slag also reduces the recovery rate of metal zinc and cadmium. Due to the large difference in properties of ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B19/20C22B19/04C22B15/00C22B17/00C25C1/24
CPCC22B7/001C22B7/007C22B7/04C22B15/0071C22B15/0089C22B17/02C22B17/04C22B19/04C22B19/22C22B19/26C25C1/24Y02P10/20
Inventor 李世平韦国龙曾光祥卢宇王志斌
Owner 贵州省兴安环保科技有限公司
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