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Method for selectively removing lead from electrolytic manganese anode mud

A technology of anode slime and electrolytic manganese, which is applied in the field of selective lead removal from electrolytic manganese anode slime, can solve the problems of changing manganese valence state, achieve the effects of reducing the discharge of three wastes, high economic efficiency, and improving the effect of lead removal

Inactive Publication Date: 2020-11-27
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for selectively removing lead from electrolytic manganese anode slime, aiming to solve the problem that the existing method for removing lead from electrolytic manganese anode slime will change the valence state of manganese

Method used

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  • Method for selectively removing lead from electrolytic manganese anode mud

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Embodiment 1

[0028] Mix 300g of electrolytic manganese anode slime with lead content of 9.8wt.%, 180g of sodium acetate and 300g of water, and ball mill at 70°C at 300rpm for 2 hours, then add 600g of water to dilute the slurry to obtain a hot ball mill slurry. After separation, deleaded anode slime and lead leaching solution are obtained. The lead content in the deleaded anode slime is 0.34wt.%. Take 400mL lead leaching solution, add 7.8mL sodium sulfide solution with a concentration of 250g / L to it, stir and react at 60°C for 3 hours, filter the lead sulfide precipitate to obtain the lead sinking mother liquor. The lead sinking mother liquor is evaporated and concentrated to obtain a concentrated solution with a sodium acetate concentration of 1.53 mol / L. Place the concentrated solution in an environment of 12°C to insulate part of the sodium sulfate to crystallize, and obtain a desulfurized sodium acetate solution after solid-liquid separation.

Embodiment 2

[0030] Mix 300g of electrolytic manganese anode slime with a lead content of 6.3wt.%, 200g of sodium acetate and 150g of water, and ball mill for 1 hour at 50°C with a rotation speed of 350rpm, then add 450g of water to dilute the slurry to obtain a hot ball mill slurry. After separation, deleaded anode slime and lead leaching solution are obtained. The lead content in the deleaded anode slime is 0.23wt.%. Take 300mL lead leaching solution, add 7.5mL sodium sulfide solution with a concentration of 200g / L to it, stir and react at 90°C for 1 hour, filter the lead sulfide precipitate to obtain the lead sinking mother liquor. The lead sinking mother liquor is evaporated and concentrated to obtain a concentrated solution with a sodium acetate concentration of 1.79 mol / L. Place the concentrated solution in an environment of 12°C to insulate part of the sodium sulfate to crystallize, and obtain a desulfurized sodium acetate solution after solid-liquid separation.

Embodiment 3

[0032] Mix 400g of electrolytic manganese anode slime containing 5.6wt.% lead with 270g of sodium acetate and 250g of water, ball mill at 90°C and 350rpm for 1.5 hours, add 400g of water to dilute the slurry to obtain hot ball mill slurry, and pass solid-liquid After separation, deleaded anode slime and lead leaching solution are obtained. The lead content in the deleaded anode slime is 0.11wt.%. Take 300mL lead leaching solution, add 7.0mL sodium sulfide solution with a concentration of 250g / L to it, stir and react at 70°C for 2 hours, filter the lead sulfide precipitate to obtain the lead sinking mother liquor. The lead sinking mother liquor is evaporated and concentrated to obtain a concentrated solution with a sodium acetate concentration of 1.87 mol / L. Place the concentrated solution in an environment of 15°C to insulate part of the sodium sulfate to crystallize, and obtain a desulfurized sodium acetate solution after solid-liquid separation.

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Abstract

The invention discloses a method for selectively removing lead from electrolytic manganese anode mud. The method comprises the following steps of: (1) mixing the electrolytic manganese anode mud witha sodium acetate solution, and performing lead leaching operation through a hot ball mill to obtain hot ball mill thick slurry; (2) washing and diluting the hot ball mill thick slurry obtained in thestep (1) with water, and performing solid-liquid separation on the hot ball mill thin slurry to obtain lead-removed anode mud and a lead leaching solution; (3) adding sodium sulfide into the lead leaching solution obtained in the step (2), performing vulcanization lead precipitation operation, and performing solid-liquid separation on a product obtained after vulcanization lead precipitation to obtain lead sulfide precipitate and a lead precipitation mother solution; (4) evaporating and concentrating the lead precipitation mother solution obtained in the step (3); and (5) crystallizing a concentrated solution obtained in the step (4) at a temperature not higher than 15 DEG C, and separating out sodium sulfate crystals to obtain a desulfurized sodium acetate solution. According to the method, the lead removal effect can be remarkably improved, the valence state of manganese ions is not changed in the leaching process, and the emission of three wastes can be reduced.

Description

technical field [0001] The invention relates to the technical field of waste residue recovery, in particular to a method for selectively removing lead from electrolytic manganese anode slime. Background technique [0002] Electrolytic manganese anode slime is the waste residue produced in the anode area during the electrolytic production of manganese metal. Due to the use of lead-based insoluble anodes, the anode slime contains about 5wt.% lead, making it a hazardous waste. Lead mainly exists in the form of lead sulfate in electrolytic manganese anode slime. Although lead sulfate can be dissolved and leached by acetate in the form of coordination compounds, due to the low crystallinity of manganese oxides in the anode slime, various valence states, and hydrated colloidal oxides, the sulfuric acid wrapped in it Lead is difficult to leach. Literature [Guo Song, Zhou Fei, Bi Yafan. Experimental research on the removal of lead from electrolytic manganese anode slime [J]. Hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C25C1/18C01G45/02
CPCC22B7/006C22B13/045C25C1/18C01G45/02Y02P10/20
Inventor 庞振升曹才放员壮壮赵宝平钟晓聪李玉虎杨亮
Owner JIANGXI UNIV OF SCI & TECH