Method for removing iron in zinc sulfate solution

A technology of zinc sulfate solution and organic complexing agent, applied in the direction of zinc sulfate, etc., can solve the problems of increasing iron ion residue, high iron removal cost, and reduced iron removal efficiency, so as to achieve improved removal rate, high iron removal efficiency, cost reduction effect

Inactive Publication Date: 2019-01-04
衡阳市大宇锌业有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0003] At present, the methods for iron removal mainly include potassium ferrocyanide, potassium ferricyanide precipitation method and organic complex precipitation method, but the blue precipitate generated by potassium ferrocyanide, potassium ferricyanide and ferric ion precipitation is used. The particles are very fine and difficult to filter, which reduces the efficiency of iron removal, and increases the iron ion residue in the original zinc sulfate solution, making the removal rate of iron ion low; The organic complexing agent in the compound cannot be recycled and reused, which makes the cost of iron removal higher

Method used

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  • Method for removing iron in zinc sulfate solution
  • Method for removing iron in zinc sulfate solution
  • Method for removing iron in zinc sulfate solution

Examples

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Embodiment 1

[0022] A method for removing iron in a zinc sulfate solution, the steps are: take 100mL of zinc sulfate solution, at room temperature, add a mass concentration of 30% organic Complexing agent 2mL, stirred, reacted at 30°C for 3min, filtered to obtain organic complex precipitate and iron-free zinc sulfate solution; then add 60g / L of Oxalic acid solution, back-extract the iron in the organic complex precipitate, shake for 12 minutes under the condition of shaking speed of 130rpm, let stand for 8 minutes after the shaking is completed, and separate the liquid, that is, the organic complexing agent and the iron oxalate complex, the organic complex The mixture can be recycled and used for complexing and precipitating iron in the zinc sulfate solution.

[0023] Preparation of organic complexing agent with a mass concentration of 30%: Take 30g of sodium thiocarbamate or tetrasodium iminodisuccinate in a 100mL beaker, add 70mL of water, and slightly heat to dissolve it in water.

Embodiment 2

[0025] A method for removing iron in a zinc sulfate solution, the steps are: take 150mL of zinc sulfate solution, at room temperature, add a mass concentration of 20% organic Complexing agent 3.75mL, stirred, reacted at 35°C for 3min, filtered to obtain organic complex precipitate and iron-free zinc sulfate solution; then add 55g / L oxalic acid solution, back extract the iron in the organic complex precipitate, shake for 14min under the condition of shaking speed of 120rpm, let stand for 6min after the shaking is completed, and separate the liquid to obtain the organic complexing agent and iron oxalate complex, organic The complexing agent can be recycled for complexing and precipitating iron in the zinc sulfate solution.

[0026] Preparation of organic complexing agent with a mass concentration of 20%: Take 20g of sodium formate or tetrasodium iminodisuccinate in a 100mL beaker, add 70mL of water, and slightly heat to dissolve it in water.

Embodiment 3

[0028] A method for removing iron in a zinc sulfate solution, the steps are: take 200mL of zinc sulfate solution, at normal temperature, add a mass concentration of 25% organic Complexing agent 3mL, stirred, reacted at 40°C for 4min, filtered to obtain organic complex precipitate and iron-free zinc sulfate solution; then add 50g / L of Oxalic acid solution, extract the iron in the organic complex precipitate, shake for 10 minutes under the condition of shaking speed of 120rpm, let it stand for 5 minutes after the shaking is completed, and separate the liquid, that is, the organic complexing agent and the iron oxalate complex, the organic complex The mixture can be recycled and used for complexing and precipitating iron in the zinc sulfate solution.

[0029] Preparation of organic complexing agent with a mass concentration of 25%: Take 25g of sodium formex or tetrasodium iminodisuccinate in a 100mL beaker, add 70mL of water, and slightly heat to dissolve it in water.

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Abstract

The invention discloses a method for removing iron in a zinc sulphate solution. The method comprises the steps: adding an organic complexing agent to the zinc sulphate solution and carrying out iron removal, stirring and filtering to obtain an iron-free zinc sulphate solution and an organic complex precipitate; adding a back-extractant to the organic complex precipitate and back extracting the organic complex precipitate to separate the organic complexing agent from the iron; and recycling the back-extracted organic complexing agent for iron removal. The method disclosed by the invention has the advantages that the iron in the zinc sulfate solution can be effectively removed; the iron removing efficiency is high and the process is simple; the iron removing rate is up to 90%; and the iron removing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for removing iron in a zinc sulfate solution. Background technique [0002] Industrial zinc sulfate is widely used in industry, medicine and agriculture and other fields. With the increasing demand for low-iron zinc sulfate, the research on iron removal of industrial zinc sulfate has been paid more and more attention by the zinc sulfate industry. [0003] At present, the methods for iron removal mainly include potassium ferrocyanide, potassium ferricyanide precipitation method and organic complex precipitation method, but the blue precipitate generated by potassium ferrocyanide, potassium ferricyanide and ferric ion precipitation is used. The particles are very fine and difficult to filter, which reduces the efficiency of iron removal, and increases the iron ion residue in the original zinc sulfate solution, making the removal rate of iron ion low; The orga...

Claims

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Application Information

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IPC IPC(8): C01G9/06
CPCC01G9/06
Inventor 颜昌军
Owner 衡阳市大宇锌业有限公司
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