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Method for removing fluorine and chlorine in zinc smelting electrolyte

A zinc electrolyte and electrolyte technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as complex composition, large amount of sedimentation residue, and large amount of residue

Active Publication Date: 2021-07-13
湖南中金岭南康盟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex composition of the zinc sulfate solution, the amount of precipitant used in the chemical precipitation method is often large and the cost is high
For example, Danxia Smelter currently mainly adopts the method of adding lanthanum chloride and bismuth oxide to the zinc electrolyte to remove fluorine and chlorine, but the cost of defluorination is as high as 100-120 yuan / kg-F, and the cost of dechlorination is as high as 160-100 yuan. 180 yuan / kg-Cl
If lime (or calcium chloride) is used instead of lanthanum chloride to remove fluoride, not only calcium fluoride precipitation but also a large amount of calcium sulfate precipitation will be produced during the precipitation process, resulting in excessive slag
Therefore, the high operating cost and the large amount of precipitated slag are the biggest problems faced in the promotion of fluorine and chlorine treatment technology in zinc electrolyte.

Method used

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  • Method for removing fluorine and chlorine in zinc smelting electrolyte
  • Method for removing fluorine and chlorine in zinc smelting electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The composition of the zinc electrolyte is as follows:

[0067] Zinc ion concentration is 80g / L, fluoride ion concentration is 1000mg / L, chloride ion concentration is 2500mg / L; pH value is 7.0.

[0068] For processing see figure 1 , figure 1 It is a schematic flow diagram of removing fluorine and chlorine from the zinc smelting electrolyte in an embodiment of the present invention, specifically including:

[0069] S1. Take 100L of zinc electrolyte, 500L of pure water, and 1.75kg of sodium sulfate and add them to the regulating water tank, and control the ratio of the moles of sodium ions in the regulating water tank to the total moles of fluorine and chloride ions to be 1:1. Adjust the mixed liquid in the water tank to enter the nanofiltration system for nanofiltration separation.

[0070] The operating conditions of nanofiltration separation are: pressure 6.0MPa, temperature 12°C, membrane surface flow velocity 0.041m / s, pH 5.3.

[0071] After separation by nanofil...

Embodiment 2

[0083] The composition of the zinc electrolyte is as follows:

[0084] Zinc ion concentration is 80g / L, fluoride ion concentration is 1000mg / L, chloride ion concentration is 2500mg / L; pH value is 7.0.

[0085] The process is as follows:

[0086] S1. Take 100L of zinc electrolyte, 200L of pure water, and 1.75kg of sodium sulfate and add them to the regulating water tank, and control the ratio of the moles of sodium ions in the regulating water tank to the total moles of fluorine and chloride ions to be 1:1. Adjust the mixed liquid in the water tank to enter the nanofiltration system for nanofiltration separation.

[0087] The operating conditions of nanofiltration separation are: pressure 4.2MPa, temperature 16°C, membrane surface flow velocity 0.035m / s, pH 4.8.

[0088] After separation by nanofiltration, 90L nanofiltration concentrated water (zinc concentration is 1.37mol / L) and 210L fluorine-containing chlorine solution (sulfate radical concentration is 200mg / L) are obtained...

Embodiment 3

[0100] The composition of the zinc electrolyte is as follows:

[0101] Zinc ion concentration is 160g / L, fluoride ion concentration is 1000mg / L, chloride ion concentration is 2500mg / L; pH value is 7.0.

[0102] The process is as follows:

[0103] S1. Take 100L of zinc electrolyte, 500L of pure water, and 2.62kg of sodium sulfate and add them to the regulating water tank, and control the ratio of the moles of sodium ions in the regulating water tank to the total moles of fluorine and chloride ions to be 1.5:1. Adjust the mixed liquid in the water tank to enter the nanofiltration system for nanofiltration separation.

[0104] The operating conditions of nanofiltration separation are: pressure 7.5MPa, temperature 22°C, membrane surface flow velocity 0.045m / s, pH 5.1.

[0105] After separation by nanofiltration, 110L of nanofiltration concentrated water (with a zinc concentration of 2.24mol / L) and 490L of fluorine-containing chlorine solution (with a sulfate radical concentratio...

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Abstract

The invention provides a method for removing fluorine and chlorine in a zinc smelting electrolyte. The removal method provided by the invention comprises the following steps: mixing the zinc electrolyte with sodium sulfate and water, and carrying out nanofiltration separation to obtain ZnSO4-containing nanofiltration concentrated water and a fluorine-containing chlorine solution. Through the treatment process, fluorine chloride ions in the zinc electrolyte are effectively removed, fluorine-containing wastewater is not generated, and compared with an existing chemical precipitation method, the formed intermediate solution can be subjected to precipitation treatment by adopting low-price calcium salt, so that the treatment cost is obviously reduced. The consumption of a treating agent or additives (sodium sulfate and CaCl2) used in the treatment process is greatly reduced, the treatment cost is also reduced, and meanwhile, the amount of formed sediment slag is also obviously reduced.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202010020309.2 and the title of the invention "A Method for Removing Fluorine and Chlorine in Electrolyte for Zinc Smelting" submitted to the China Patent Office on January 09, 2020, the entire content of which has been passed References are incorporated in this application. technical field [0002] The invention relates to the technical field of heavy metal smelting wastewater treatment, in particular to a method for removing fluorine and chlorine in zinc smelting electrolyte. Background technique [0003] In zinc electrowinning, the concentration of fluorine and chlorine in the electrolyte (zinc sulfate solution) is too high, which will cause great harm to production and product quality. Specifically, fluoride ions will destroy the aluminum oxide film on the surface of the cathode aluminum plate, making the deposited zinc and the fresh surface of the aluminum plate for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/12C02F101/14
CPCC02F1/441C02F1/5245C02F2101/14C02F2101/12Y02P10/20
Inventor 杨有才周康根余承红彭佳乐姜科潘希贤高峰周惠吴班周胜前
Owner 湖南中金岭南康盟环保科技有限公司
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