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Technology for preparing tribasic copper chloride and tetrabasic zinc chloride by utilization of brass slag and zinc-containing flue ash

A technology of copper chloride and zinc chloride, which is applied in the direction of copper chloride, copper halide, zinc halide, etc., can solve the problems of difficulty in controlling pH, difficulty in controlling the end point, increasing the difficulty and cost of wastewater treatment, and improving the utilization , The effect of reducing processing costs

Active Publication Date: 2016-03-16
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The disadvantage of preparing basic zinc chloride by solid-liquid reaction is that the end point of the reaction is difficult to judge
The preparation of basic zinc chloride by liquid-liquid reaction includes direct reaction with a strong base such as sodium hydroxide and reaction with a weak base such as ammonia water. The use of sodium hydroxide is prone to occur because the alkalinity is too strong and it is difficult to control the pH, and it is usually synthesized The basic zinc chloride particles will be fine and difficult to rinse and filter; if the reaction with ammonia is intermittent, the production efficiency will be low; if it is continuous reaction, the concentration of ammonium ions in the reaction system will continue to accumulate, and a large amount of zinc Ions form complexes with ammonium ions and dissolve in the liquid phase, reducing the yield of basic zinc chloride
[0018] In summary, in the prior art, although there are multiple methods for the treatment of brass slag and zinc-containing flue ash, each has its own shortcomings. The treatment of brass slag usually only recycles the copper therein, and fails to Reasonably recover the zinc component with a relatively high content; for zinc-containing flue ash, the zinc component is also mainly recovered, and the copper component is not recovered reasonably, and the end point is difficult to control
At the same time, if the brass slag and zinc-containing flue ash are treated separately, the components of the wastewater produced by each are complex, which increases the difficulty and cost of subsequent wastewater treatment. The method of recovering copper and zinc components is very meaningful

Method used

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  • Technology for preparing tribasic copper chloride and tetrabasic zinc chloride by utilization of brass slag and zinc-containing flue ash
  • Technology for preparing tribasic copper chloride and tetrabasic zinc chloride by utilization of brass slag and zinc-containing flue ash
  • Technology for preparing tribasic copper chloride and tetrabasic zinc chloride by utilization of brass slag and zinc-containing flue ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] S12. Mix the above filter residue with 505g brass slag containing 28.36% copper and 39.55% zinc, then add 1600mL31% hydrochloric acid, stir for 1 hour under the condition that the circulating cooling water keeps the reaction temperature below 40°C, and slowly add 250mL hydrogen peroxide , keep the reaction temperature below 40°C. Suction filter and rinse the filter residue, and mix the obtained filtrate with washing water, which is about 2500mL copper-zinc mixed acid solution, containing 60.8g / L copper and 80g / L zinc.

[0064] S21. Adjust the pH of the copper-zinc mixed acid solution to 1 with 1840 mL of ammonia etching waste liquid containing 90 g / L of copper, then add an appropriate amount of impurity remover, and react for 20 minutes to remove toxic metals such as lead, arsenic, chromium, and mercury. Obtained 4330 mL of copper and zinc mixed solution after removing impurities, containing 73.33 g / L of copper and 46.18 g / L of zinc;

[0065] S22. React the copper-zinc...

Embodiment 2

[0070] S12. Mix the above filter residue with 776g brass slag containing 29.68% copper and 37.72% zinc, then add 3100mL31% hydrochloric acid, stir for 1.5 hours under the condition that the circulating cooling water keeps the reaction temperature below 40°C, and slowly add 580mL8% Sodium hypochlorite, keep the reaction temperature below 40°C. Suction filter and rinse the filter residue, and mix the obtained filtrate with washing water to form a copper-zinc mixture of about 3600mL, containing 76.75g / L copper and 81g / L zinc.

[0071] S21. Adjust the pH of the copper-zinc mixed solution to 1.5 with 20% ammonia water 2200mL, then add an appropriate amount of impurity remover, and react for 20 minutes to remove toxic metals such as lead, arsenic, chromium, mercury, etc., and obtain a mixed mixture of copper and zinc after impurity removal. Liquid 5800mL, containing copper 47.63g / L, zinc 50.27g / L;

[0072] S22. React the copper-zinc mixture after impurity removal with 1740mL of 5% ...

Embodiment 3

[0077]S12. Mix the above filter residue with 1060g brass slag containing 29.68% copper and 37.72% zinc, then add 5300mL31% hydrochloric acid, stir for 2 hours under the condition that the circulating cooling water keeps the reaction temperature below 40°C, and slowly add 1060mL27. 5% hydrogen peroxide, keep the reaction temperature below 40°C. Suction filter and rinse the filter residue, and mix the obtained filtrate with washing water to form a copper-zinc mixture solution of about 6800mL, containing 53.6g / L copper and 61.2g / L zinc.

[0078] S21. Adjust the pH of the copper-zinc mixture to 2 with 650mL of 50% sodium hydroxide solution, then add an appropriate amount of impurity remover, and react for 20 minutes to remove toxic metals such as lead, arsenic, chromium, mercury, etc., and obtain copper after impurity removal. , Zinc mixture 7400mL, copper 48g / L, zinc 56g / L;

[0079] S22. React the copper-zinc mixed solution after impurity removal with 1850mL of 4% ammonia water,...

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Abstract

The invention relates to a technology for preparing tribasic copper chloride and tetrabasic zinc chloride by utilization of brass slag and zinc-containing flue ash. The technology comprises steps of acid dipping, synthesis of tribasic copper chloride and synthesis of tetrabasic zinc chloride. The technology achieves effective recovery of the copper element and the zinc element in brass slag and zinc-containing flue ash. When the provided technology is compared with technologies wherein brass slag or zinc-containing flue ash can be only processed individually, and only copper or zinc can be recovered, the resource utilization degree is raised greatly. Tribasic copper chloride and tetrabasic zinc chloride prepared through the whole technology meet feed-grade standards. Only one kind of production waste is produced, waste water processing burden is reduced, and circular economy and resource comprehensive utilization principles are met.

Description

technical field [0001] The invention relates to the field of recovery and treatment of solid waste such as metal smelting waste slag and flue ash, in particular to a process for preparing basic copper chloride and basic zinc chloride by using brass slag and zinc-containing flue ashes. Background technique [0002] Pyrometallurgy is one of the processes for producing copper by smelting ore. The slag produced per ton of copper products is about 3 to 5 tons. The amount of slag increases with the increase of copper smelting production. Brass slag generally contains 25-35% by mass of copper, 35-45% by mass of zinc, and a large amount of zinc oxide, which is a high-grade secondary resource. Today, with increasingly strict environmental protection requirements and increasingly scarce mineral resources , the comprehensive recovery and utilization of copper slag has attracted people's attention. The content of zinc in the flue ash zinc-containing waste of the smelter is 30-60% by ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/05C01G9/04
CPCC01G3/05C01G9/04C01P2006/80
Inventor 吴阳东黄智源査正炯王皓王永成
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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