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Method for circularly removing impurity chlorine in zinc sulfate solution by using cuprous salt

A zinc sulfate and cuprous technology, which is applied in the direction of copper chloride, copper halide, process efficiency improvement, etc., can solve the problem of zinc sulfate solution treatment that is difficult to adapt to a large range of chlorine content, the ion exchange dechlorination method has a small application range, and solvent extraction In order to solve the problems such as difficulty in large-scale operation of the method, it can achieve the effects of easy extraction of sodium chloride, comprehensive utilization and less impurities.

Active Publication Date: 2012-10-17
GREENNOVO ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

The processing cost of the silver chloride precipitation method is too high, the dechlorination efficiency of the copper slag dechlorination method is not high, the application range of the ion exchange dechlorination method is relatively small, and the solvent extraction method is difficult to operate on a large scale. It is difficult to adapt to the treatment of zinc sulfate solution with a large range of chlorine content due to economic conditions and other reasons

Method used

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  • Method for circularly removing impurity chlorine in zinc sulfate solution by using cuprous salt

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Embodiment 1

[0032] The technological process is shown in the accompanying drawing.

[0033] Dechlorination: Take 10000mL of zinc sulfate solution, the composition is (g / L): Zn 2+ 126.4 Cl － 13.78, pH5.3, put it in the reaction tank, turn on the agitator, heat up to 45°C, add 1100.0g of industrial copper sulfate, dissolve completely, adjust the pH to 2.0-2.5 with concentrated sulfuric acid, add 150.0g of zinc powder continuously, react 0.5 h, filter. The obtained filtrate composition (g / L): Zn 2+ 124.4 、Cl － 0.21, pH2.3, dechlorination rate 98.30%.

[0034] Salt leaching: Take the dechlorination residue obtained from the above dechlorination, the composition is (%): Zn3.51, Cu60.79, Cl26.75, the rest is other, put it in the reaction tank, add the - 150g / L industrial salt solution, start the agitator, heat to 70°C, adjust the pH to 2.0-2.5 with sulfuric acid, fully react for 1.5h, and filter to obtain the salt infusion and leaching residue. Leach residue (Cu29.3%, H 2 O 23.5% ), th...

Embodiment 2

[0038] The technological process is shown in the accompanying drawing.

[0039] Dechlorination: Take 10000mL of zinc sulfate solution, the composition is (g / L): Zn 2+ 132.4, Cl － 1.78, pH5.3, put it in the reaction tank, turn on the stirrer, raise the temperature to 45°C, add 1100.0g of industrial copper sulfate, dissolve completely, adjust the pH2.0~2.5 with concentrated sulfuric acid, add 150.0g of metal zinc powder, during the process Keep the pH, react for 0.5h, filter to get the filtrate, the composition is (g / L): Zn 2+ 129.4, Cl － 0.31, pH2.2, dechlorination rate 81.50%.

[0040]Salt leaching: Take the dechlorination residue obtained from the above dechlorination, the composition is (%): Zn2.51, Cu58.89, Cl 25.75, the balance is other, put it in the reaction tank, add the － 150g / L industrial salt solution, start the agitator, heat up to 70°C, adjust the pH to 2.0-2.5 with sulfuric acid, react for 1.5h, filter to obtain leaching residue, the composition is (%): Cu28....

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Abstract

The invention relates to a method for circularly removing impurity chlorine in zinc sulfate solution by using cuprous salt. The method comprises the following steps of: reacting industrial cupric sulfate with electric furnace zinc powder in a chlorine-containing zinc sulfate solution to generate dechlorinating slag, i.e., cuprous chloride Cu2Cl2; leaching the dechlorinating slag by using industrial salt water, separating copper sponge to generate cuprous liquid Na2(CuCl3), and neutralizing by caustic soda liquid NaOH to synthesize original cuprous salt Cu2O.CuOH; and adding the cuprous salt into the chlorine-containing zinc sulfate solution to react so as to generate the dechlorinating slag, and repeatedly and circularly carrying out the steps. The method is characterized in that chlorinein the zinc sulfate solution is removed by using the active cuprous salt, so that the method is easy to operate and high in chlorine removing efficiency; the produced dechlorinating slag is leached by using the industrial salt, so that chlorine is enriched in the high-concentration industrial salt solution, comprehensive utilization is facilitated, and simultaneously, the impurity in the dechlorinating slag is removed, so that the accumulation of the impurity in the process of recycling can be avoided; and the leach liquor of the industrial salt can be neutralized and synthesized by the caustic soda liquid, and the product cuprous salt is high in active ingredients and less in impurity, so that effective removal of chlorine in the zinc sulfate solution is facilitated, and the dechlorinating efficiency of the zinc sulfate solution containing 1.0-20.0g / L of chlorine can reach 80-99%.

Description

technical field [0001] The invention relates to a process method for removing chloride ions in zinc sulfate solution by cuprous salt, in particular to a method for circularly removing impurity chlorine from zinc sulfate solution by cuprous salt. Background technique [0002] Fuming reduction volatilization processes zinc-containing solid waste, such as iron-containing dust and lead smelting slag, and produces zinc-containing fumes, which are usually used as raw materials for zinc hydrometallurgy. Chlorine in the zinc-containing fumes basically all enters the zinc sulfate solution during leaching. Chloride ions in zinc sulfate solution are generally 2.0-20.0g / L, which is difficult to meet the requirements of electrolysis for zinc sulfate solution, and must be removed. [0003] Dechlorination methods in zinc sulfate solution include silver chloride precipitation method, copper slag dechlorination method, ion exchange dechlorination method, and solvent extraction method. The ...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B15/00C01G3/05
CPCY02P10/20
Inventor 张吉和王树楷
Owner GREENNOVO ENVIRONMENTAL TECH CO LTD
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