CN-122010164-A - Method for dechlorination in zinc sulfate solution

Abstract

The invention discloses a method for dechlorination in a zinc sulfate solution, which comprises the steps of pretreatment and main reaction, and specifically comprises the steps of adjusting the pH value of the zinc sulfate solution to be treated to 1.5-3.5 to obtain a material a, adding a precipitant into the material a, and stirring and reacting to obtain the dechlorinated zinc sulfate solution, wherein the precipitant is trialkyl bismuth, trialkyl antimony, trialkyl lead or trialkyl vanadium. The invention improves the efficiency and stability of chlorine removal by regulating and controlling the reaction conditions such as pH value, temperature, precipitant type and the like, and finally realizes an environment-friendly and economically feasible treatment scheme.

Inventors

• HE XIAOCAI
• LIU JINYUE
• XU YUAN
• REN JIUYANG
• LI YINA
• Pei Jiangyong
• HE QIUGU
• SHI HUIXIAN
• LIN SHENGNAN
• FANG DE
• YUAN YE
• REN TING

Assignees

• 昆明冶金研究院有限公司

Dates

Publication Date

20260512

Application Date

20260224

Claims (6)

1. 1. The method for dechlorinating the zinc sulfate solution is characterized by comprising the following steps of pretreatment and main reaction: A. Pre-treating, namely regulating the pH value of the zinc sulfate solution to be treated to be 1.5-3.5 to obtain a material a; B. Adding a precipitant into the material a for stirring reaction to obtain a dechlorinated zinc sulfate solution; The precipitant is trialkyl bismuth, trialkyl stibium, trialkyl lead or trialkyl vanadium.
2. 2. The method for dechlorination in a zinc sulfate solution according to claim 1, wherein the chloride ion content in the zinc sulfate solution to be treated in the step a is 0.5-6 g/L.
3. 3. The method for dechlorination in zinc sulfate solution according to claim 1, wherein the adding amount of the precipitant in the step B is 4.5-5.5 g/L.
4. 4. The method for dechlorination in zinc sulfate solution according to claim 1, wherein the stirring speed of the stirring reaction in the step B is 100-200 r/min.
5. 5. The method for dechlorination in a zinc sulfate solution according to claim 1, wherein the temperature of the stirring reaction in the step B is 50-70 ℃.
6. 6. The method for dechlorination in a zinc sulfate solution according to claim 1, wherein the stirring reaction time in the step B is 1-3 hours.

Description

Method for dechlorination in zinc sulfate solution Technical Field The invention belongs to the technical field of metallurgy, and particularly relates to a method for dechlorinating zinc sulfate solution. Background Zinc sulfate is an important raw material for electrolytic zinc, and a certain amount of impurity element chlorine is often accompanied in the solution. If the zinc is directly processed to enter the next zinc preparation process, the product quality can be seriously affected. Although the existing chlorine removal methods are various, the existing chlorine removal methods often face the problems of low efficiency, high cost, complex operation and the like in practical application. Therefore, it is necessary to develop a method capable of solving the above technical problems. Disclosure of Invention The invention aims to provide a method for dechlorinating zinc sulfate solution. The aim of the invention is achieved in that the method for dechlorination in zinc sulfate solution comprises pretreatment and main reaction steps, and specifically comprises the following steps: A. Pre-treating, namely regulating the pH value of the zinc sulfate solution to be treated to be 1.5-3.5 to obtain a material a; B. Adding a precipitant into the material a for stirring reaction to obtain a dechlorinated zinc sulfate solution; The precipitant is trialkyl bismuth, trialkyl stibium, trialkyl lead or trialkyl vanadium. The technical principle is as follows: The first step is pretreatment, in which carbon-metal bonds in alkyl metal compounds are broken under acidic conditions to release metal ions and alkanes. R3M + 3H+ → M3+ + 3RH↑ And the second step is that the main reaction, the released high-valence metal ions (M 3+) are hydrolyzed and combined with chloride ions to generate the oxychloride precipitate. M3+ + H2O + Cl− → MOCI↓ + 2H+ The method for dechlorination in the zinc sulfate solution comprises the steps of adjusting the pH value of the chlorine-containing zinc sulfate solution to be 1.5-3.5, stirring, adding a precipitant, controlling the mass ratio of chlorine in the solution to the precipitant to be 1:1-100, heating the mixed solution to 50-80 ℃, reacting for 0.5-2 hours, carrying out solid-liquid separation, filtering to remove oxychloride precipitate, and thus completing the removal of chlorine in the zinc sulfate solution. The precipitant is trialkyl bismuth, trialkyl antimony, trialkyl lead, trialkyl vanadium, etc. The invention improves the efficiency and stability of chlorine removal by regulating and controlling the reaction conditions such as pH value, temperature, precipitant type and the like, and finally realizes an environment-friendly and economically feasible treatment scheme. Detailed Description The invention is further illustrated, but is not limited in any way, by the following examples, and any alterations or substitutions based on the teachings of the invention are within the scope of the invention. The method for dechlorinating the zinc sulfate solution comprises the steps of pretreatment and main reaction, and specifically comprises the following steps: A. Pre-treating, namely regulating the pH value of the zinc sulfate solution to be treated to be 1.5-3.5 to obtain a material a; B. Adding a precipitant into the material a for stirring reaction to obtain a dechlorinated zinc sulfate solution; The precipitant is trialkyl bismuth, trialkyl stibium, trialkyl lead or trialkyl vanadium. And (C) the chloride ion content in the zinc sulfate solution to be treated in the step A is 0.5-6 g/L. And B, adding the precipitant in the step 4.5-5.5 g/L. And B, stirring the reaction in the step of stirring at a stirring speed of 100-200 r/min. And B, stirring and reacting at the temperature of 50-70 ℃. And B, stirring and reacting for 1-3 hours. The invention is further illustrated by the following examples: Comparative example 1 Chinese patent CN103572051A discloses a dechlorination method of zinc sulfate solution, wherein the zinc sulfate solution contains 100-150 g/L of zinc and 0.5-5.0 g/L of chlorine, sulfuric acid is added to obtain an acidic solution with the sulfuric acid concentration of 20-75 g/L, and the acidic solution is subjected to selective electrodialysis in a four-diaphragm electrolytic cell under the conditions of normal temperature and current density of 50-200A/m 2 to obtain a low-chlorine solution with the chlorine content of 0.1-0.3 g/L. Example 1 200ML of zinc sulfate solution with the chlorine content of 0.58g/L is measured, the pH value is regulated to 2.0, 5.0g of trialkyl bismuth is added by stirring, the temperature is raised to 55-65 ℃, the reaction is carried out for 2 hours, after the reaction is finished, solid-liquid separation is carried out, filter residues are bismuth oxychloride precipitates, and the chlorine content in filtrate is 0.131mg/L. Example 2 200ML of zinc sulfate solution with the chlorine content of 0.51g/L is measured, the pH value is regulated t