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Method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing zinc sulfate solution

A technology of zinc chlorosulfate and solution, applied in the field of separation of zinc, fluorine and chlorine, can solve the problems of poor fluorine removal effect, difficult process control, limited removal efficiency and the like

Inactive Publication Date: 2011-04-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have poor fluoride removal effect and unsatisfactory application effect.
[0003] The literature "Research on Fluorine and Chlorine Removal from Zinc Oxide Fume Leach Solution by Goethite Method" discloses a method for removing fluorine and chlorine from the solution by goethite method, but the removal efficiency of fluorine and chlorine is limited by the concentration of iron ions in the solution. The process is difficult to control
The patent application number is 200710035354.X "A Method for Removing Chlorine in Zinc Sulfate Solution" discloses a method of utilizing copper slag to react with chloride ions in the solution to form cuprous chloride precipitation and remove chlorine, but there are still The source of copper slag and the treatment of copper slag

Method used

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  • Method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing zinc sulfate solution
  • Method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing zinc sulfate solution
  • Method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing zinc sulfate solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The zinc sulfate solution obtained by volatilizing the secondary zinc oxide powder obtained by using the rotary kiln and leaching with sulfuric acid, the chemical composition of the solution is listed in the following table:

[0020]

[0021] Due to the high concentration of Fe(III) and Cd ions in the solution, Fe(III) is easier to be extracted by P204 than zinc, and it is difficult to strip, but Fe(II) is difficult to be extracted by P204. Part of Cd is extracted into the organic phase and is easy to back-extract. Therefore, it is necessary to add zinc powder to reduce the easily extracted Fe(III) to difficultly extracted Fe(II), and replace cadmium with metal cadmium to remove. When the addition of Zn powder is 5g / L, the reaction time is 30min, the temperature is 20°C, the reduction rate of Fe(III) is 97.3%, and the removal rate of cadmium is 98.7%. Calcium oxide was added to adjust the pH of the solution to 4.5, and 6-stage countercurrent extraction was carried o...

Embodiment 2

[0025] The zinc sulfate solution leached by sulfuric acid from blast furnace zinc-containing dust is used, and the chemical composition of the solution is listed in the following table:

[0026]

[0027] The addition of Zn powder is 5g / L, the reaction time is 30min, the temperature is 25°C, the reduction rate of Fe(III) is 98.7%, and the removal rate of cadmium is 99.6%. Add calcium oxide to adjust the pH of the solution to 4.0, carry out 5-stage countercurrent extraction, compare (O / A) 2:1, mixing time 2-3min, clarifying time 5min, organic phase composition 30% P204+70% sulfonated kerosene, extraction The temperature is 25°C. During the extraction process, lye needs to be supplemented to maintain the pH of the raffinate at 2.0-3.5. The zinc extraction rate is 87.4%. The loaded organic phase contains about 17.7g / L of zinc, and fluorine and chlorine are not extracted. Stripping agent uses 180g / L sulfuric acid solution. The stripping mixing time is 2 minutes, the ratio (O / A)...

Embodiment 3

[0031] Adopt Zn-MnO Waste dry cell through the zinc sulfate solution of sulfuric acid leaching, the chemical composition of solution is listed in the following table:

[0032]

[0033]When the added amount of Zn powder is 3g / L, the reaction time is 30min, the temperature is 25°C, the reduction rate of Fe(III) is 98.3%, and the removal rate of cadmium is 99.4%. Calcium oxide was added to adjust the pH of the solution to 5.0, and 4-stage countercurrent extraction was carried out. The ratio (O / A) was 1:1, the mixing time was 2-3 minutes, and the clarification time was 5 minutes. The organic phase composition was 25% P204+80% sulfonated kerosene, and the extraction The temperature is 25°C, lye needs to be added during the extraction process to maintain the pH of the raffinate at 2.0-3.5, the zinc extraction rate is 88.3%, the loaded organic phase contains about 16.3g / L of zinc, and fluorine and chlorine are not extracted. Stripping agent uses 150g / L sulfuric acid solution. The...

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Abstract

The invention relates to a method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing zinc sulfate solution, in particular to a method for separating zinc, fluorine and chlorine from fluorine- and chlorine-containing secondary zinc resource Sulfuric acid leaching solution. In the method, during solution pretreatment, zinc powder and calcium oxide are added into the fluorine- and chlorine-containing zinc sulfate solution; during extraction, di-(2-ethylhexyl)phosphate is adopted as an extracting agent and kerosene is adopted as a diluent to prepare an organic phase with certain concentration, the organic phase is mixed with the pretreated solution for extraction, zinc in a water phase is transferred into the organic phase, fluoride ions and chloride ions are remained in the water phase, and the separation of the zinc, fluorine and chlorine is realized; and during back extraction, sulfuric acid solution serves as a back washing agent, the zinc-containing loaded organic phase is mixed for back extraction, the zinc in the loaded organic phase is transferred into the water phase again, zinc sulfate solution is obtained and the organic phase is subjected to impurity removal and recycled. The zinc, fluorine and chlorine separation efficiency is over 95 percent, and the obtained zinc sulfate solution has high purity and can be combined into a purification flow of the traditional zinc smelting. The method has the advantages that: the cost is low, the method is easy to operate, the efficiency is high, and the continuous production can be realized.

Description

technical field [0001] The invention relates to a method for separating zinc from fluorine and chlorine in a zinc sulfate solution containing fluorine and chlorine, in particular to a method for separating zinc from fluorine and chlorine in a sulfuric acid leaching solution of secondary zinc resources containing fluorine and chlorine. Background technique: [0002] At present, secondary zinc oxide powder (zinc fume), zinc casting dross, blast furnace and electric furnace zinc dust, galvanizing slag, Zn-MnO 2 Secondary resources such as waste dry batteries have become important raw materials for the production of zinc and zinc sulfate. However, such resources contain a large amount of harmful impurities such as fluorine and chlorine. When wet leaching is used, fluorine and chlorine enter the zinc sulfate solution. In the preparation of zinc sulfate solution, excessive fluorine and chlorine impurities are caused, especially in the presence of fluorine ions during zinc electro...

Claims

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Application Information

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IPC IPC(8): C22B3/38C01G9/08C22B19/00
CPCY02P10/20
Inventor 魏昶李存兄邓志敢李兴彬
Owner KUNMING UNIV OF SCI & TECH
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