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Method for removing fluorine and chlorine from zinc electrolyte

A technology for zinc electrolyte and zinc electrolysis waste liquid, applied in the field of removing fluorine and chlorine, can solve the problems of large loss of zinc, high production cost and high cost of chlorine removal, and achieve the effects of strong adaptability, low cost and high efficiency

Inactive Publication Date: 2019-03-19
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher price of bismuth oxide leads to higher cost of chlorine removal
(4) Ion exchange method, using 717 type anion exchange resin for dechlorination, the loss of zinc is relatively large, and a large amount of chlorine-containing wastewater will be produced
[0008] As mentioned above, although there are many methods for removing fluorine and chlorine in the zinc electrolyte in the zinc hydrometallurgy industry, most of the above-mentioned processes are directly removing fluorine and chlorine from the zinc solution, and there are many difficult problems. Mainly the loss of zinc is large, the solution after removing fluorine and chlorine needs to be purified again, the production efficiency of removing fluorine and chlorine is low, and the production cost is high. Therefore, the present invention adopts the leaching-precipitating zinc method to remove the Fluorine, Chlorine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 2m of zinc electrolysis waste liquid with a zinc content of 52g / L, a fluorine content of 180g / L, and a chlorine content of 720g / L 3, placed in a stirring leaching tank, take 0.8t of flue dust from the zinc boiling roaster, add it to the zinc electrolysis waste liquid, turn on the steam heating, turn on the agitator, the stirring speed is 300rpm, the leaching temperature is controlled at 95°C, and the leaching time is 3h. The endpoint pH was 5.0. Use plate and frame filter press to filter the obtained leach slurry, and the filter residue is returned to the zinc smelting system. A sodium hydroxide solution with a mass concentration of 20 wt% was added to the filtrate to precipitate zinc. The precipitation temperature was 85° C., the precipitation time was 1.2 h, the stirring speed was 260 rpm, and the pH at the precipitation end point was 6.7. The zinc hydroxide precipitate is filtered, and the filtered zinc hydroxide precipitate is returned to the zinc smelting sys...

Embodiment 2

[0036] Take 2.3m of zinc electrolysis waste liquid with a zinc content of 58g / L, a fluorine content of 168g / L, and a chlorine content of 686g / L 3 , put it in a stirring heating tank, take 0.87t of volatile dust from the rotary kiln, add it to the zinc electrolysis waste liquid, turn on the steam heating, turn on the agitator, the stirring speed is 290rpm, control the leaching temperature to 98°C, and the leaching time to 2.5h, The pH of the leaching end point was 5.1. Use plate and frame filter press to filter the obtained leach slurry, and the filter residue is returned to the zinc smelting system. A sodium hydroxide solution with a mass concentration of 25% was added to the filtrate to precipitate zinc. The precipitation temperature was 88° C., the precipitation time was 1.5 h, the stirring speed was 280 rpm, and the pH at the end point of the precipitation was 6.6. The zinc hydroxide precipitate is filtered, and the filtered zinc hydroxide precipitate is returned to the zi...

Embodiment 3

[0039] Take 2.6m of zinc electrolysis waste liquid with a zinc content of 57.5g / L, a fluorine content of 181g / L, and a chlorine content of 702g / L 3 , placed in a stirring heating tank, take 0.91t of multi-hearth furnace roasting dust, add it to the zinc electrolysis waste liquid, turn on the steam heating, turn on the agitator, the stirring speed is 325rpm, the leaching temperature is controlled at 97°C, and the leaching time is 2.8h. The pH of the leaching end point was 5.6. Use plate and frame filter press to filter the obtained leach slurry, and the filter residue is returned to the zinc smelting system. A sodium hydroxide solution with a mass concentration of 30% was added to the filtrate to precipitate zinc. The precipitation temperature was 90° C., the precipitation time was 1.7 h, the stirring speed was 292 rpm, and the pH at the end point of the precipitation was 6.5. The zinc hydroxide precipitate is filtered, and the filtered zinc hydroxide precipitate is returned t...

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Abstract

The invention discloses a method for removing fluorine and chlorine from a zinc electrolyte, and belongs to the technical field of zinc smelting. According to the method, zinc-containing smoke dust generated in a zinc hydrometallurgy process is leached by using a zinc electrolysis waste liquid, sulfuric acid in the zinc electrolysis waste liquid is used as a leaching agent of zinc in the smoke dust, meanwhile steam is adopted for heating, and the zinc electrolysis waste liquid is used for leaching the zinc-containing smoke dust; and the zinc, the fluorine and the chlorine enter a leaching solution, a step-by-step precipitation method is adopted, the zinc in the solution is precipitated and returns to a zinc smelting system, the fluorine and the chlorine are converted into calcium fluorideand cuprous chloride to be precipitated and removed, the fluorine content in the zinc electrolyte can be reduced to 50 mg / L or below through a certain period of treatment, then the chlorine content isreduced to 200 mg / L or below, and the damage of the fluorine and the chlorine to zinc electrolysis is effectively avoided. The method has the characteristics of being low in cost, high in efficiencyand high in adaptability.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting, in particular to a method for removing fluorine and chlorine from a zinc electrolytic solution. Background technique [0002] The zinc concentrate used in zinc hydrometallurgy generally contains 0.001%-1% fluorine and chlorine. During the leaching process, fluorine and chlorine enter the zinc leaching solution, and then enter the zinc electrolyte. The zinc electrolysis after the accumulation of fluorine and chlorine The waste liquid returns to the zinc leaching or the new zinc electrolytic liquid dosing, resulting in the accumulation of fluorine and chlorine in the zinc electrolytic solution, and the concentration continues to increase. [0003] When the concentration of fluorine and chlorine is high to a certain extent, it will have an adverse effect on zinc electrolysis. Fluorine and chlorine exist in zinc leaching solution, purification solution and electrolyte, which will accelerate th...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/22C22B3/08C22B19/20C25C1/16C25C7/06
CPCC22B3/08C22B3/22C22B3/44C22B19/22C22B19/26C25C1/16C25C7/06Y02P10/20
Inventor 罗远辉袁学韬段锦李文良张建东闫国庆
Owner GRIMAT ENG INST CO LTD
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