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A kind of treatment method of electrolytic manganese slag

An electrolytic manganese slag and treatment method technology, applied in the field of metallurgy, can solve the problems of incomplete compound leaching, no anti-seepage, sealing, high manganese loss, etc., so as to reduce the consumption of clean water, reduce the consumption of chemicals, and improve the recovery rate Effect

Active Publication Date: 2021-07-06
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extensive press filtration process, backward equipment and low degree of mechanical automation of the existing electrolytic manganese production, about 30%-35% of the electrolyte solution remains in the manganese slag, of which the concentration of manganese sulfate (calculated as Mn) is 30g / L-36g / L, resulting in higher manganese loss
In addition, the combined leaching is not complete, and about 1.5%-2.0% of the manganese carbonate in the manganese slag has not been converted into manganese sulfate in one acid leaching
In the leaching and filtration process alone, about 3%-4% of the manganese ore (accounting for 18%-25% of the total manganese content) is not utilized, which is a serious waste of resources
At present, foreign electrolytic manganese enterprises have relatively strict requirements on the treatment of electrolytic manganese waste residue, and generally use tail ponds for disposal, while most of the electrolytic manganese enterprises in my country adopt the method of damming and stockpiling, without any measures such as anti-seepage, sealing and leachate treatment , not only occupies a large amount of land, but also the harmful substances in the manganese waste residue will penetrate into the soil, surface water and groundwater, causing great harm to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A treatment method for electrolytic manganese slag, comprising the following steps:

[0021] (1) Slurry: wash electrolytic manganese slag with electrolytic manganese anolyte at a pressure of 1.2MPa, make it preliminary slurry, and obtain slurry, discharge the slurry into the stirring tank, and stir for 140min at a temperature of 50°C , to obtain manganese slag slurry, the mass ratio of the electrolytic manganese anolyte to the electrolytic manganese slag is 0.95:1, and the Mn in the electrolytic manganese anolyte 2+ The content of ammonium sulfate is 10g / L, the content of ammonium sulfate is 90g / L, and the acidity is 34g / L;

[0022] (2) Press filtration: use a filter press to filter the manganese slag slurry, the filter pressure is 0.18MPa, keep for 8min, in order to obtain the filter cake and filtrate, send the filtrate into the filtrate pool; the filter press is a diaphragm filter press, equipment The model is MZ680;

[0023] (3) Washing with clean water: wash the f...

Embodiment 2

[0027] A treatment method for electrolytic manganese slag, comprising the following steps:

[0028] (1) Slurry: wash electrolytic manganese slag with electrolytic manganese anolyte at a pressure of 1.5 MPa to make it preliminary slurry, and obtain slurry, discharge the slurry into the stirring tank, and stir for 160min at a temperature of 55°C , to obtain manganese slag slurry, the mass ratio of the electrolytic manganese anolyte to the electrolytic manganese slag is 1.05:1, and the Mn in the electrolytic manganese anolyte 2+ The content of ammonium sulfate is 14g / L, the content of ammonium sulfate is 110g / L, and the acidity is 38g / L;

[0029] (2) Press filter: filter the manganese slag slurry with a filter press, the filter pressure is 0.22MPa, and keep it for 12 minutes. In order to obtain the filter cake and filtrate, send the filtrate into the filtrate pool; the filter press is a diaphragm filter press, and the equipment The model is MZ680;

[0030] (3) Washing with clea...

Embodiment 3

[0034] A treatment method for electrolytic manganese slag, comprising the following steps:

[0035] (1) Slurry: wash electrolytic manganese slag with electrolytic manganese anolyte at a pressure of 1.3MPa to make it preliminary slurry and obtain slurry, discharge the slurry into the stirring tank, and stir for 150min at a temperature of 52°C , to obtain manganese slag slurry, the mass ratio of the electrolytic manganese anolyte to the electrolytic manganese slag is 1.02:1, and the Mn in the electrolytic manganese anolyte 2+ The content of ammonium sulfate is 12g / L, the content of ammonium sulfate is 100g / L, and the acidity is 36g / L;

[0036] (2) Press filtration: use a filter press to filter the manganese slag slurry, the filtration pressure is 0.20MPa, and keep it for 10 minutes. In order to obtain the filter cake and filtrate, send the filtrate into the filtrate pool; the filter press is a diaphragm filter press, and the equipment The model is MZ680;

[0037](3) Washing wi...

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PUM

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Abstract

The method for treating electrolytic manganese slag in the present invention uses electrolytic manganese anolyte to flush the electrolytic manganese slag into slurry at high pressure, and the high-acid and low-manganese characteristics of the electrolytic manganese anolyte cooperates with high-pressure conditions to make the manganese slag filter cake into slurry thoroughly and greatly improve The recovery rate of metal manganese and ammonium sulfate in manganese slag; the filter cake is washed with water on the filter press, which avoids the disadvantages of inconspicuous washing effect and difficult manganese slag melting when manganese slag is compacted and then washed. Recover acid-soluble manganese and ammonium sulfate, while reducing water consumption; wash the filter cake with lye on the filter press, and the lye is poured into the filter press, vertically passing through the filter cake and continuously circulating, so as to realize the solidification of residual manganese in the manganese slag and ammonia nitrogen removal, the solid-to-liquid ratio is large, significantly reducing the consumption of chemicals; the treatment method of the electrolytic manganese slag of the present invention, the recovery rate of water-soluble manganese ≥ 90%, the recovery rate of ammonium sulfate ≥ 90%, the moisture content of manganese slag ≤ 28%, reaching The purpose of harmless treatment of electrolytic manganese slag.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a treatment method for electrolytic manganese slag. Background technique [0002] Electrolytic manganese slag is the filter residue produced during the electrolysis of manganese metal by leaching manganese carbonate ore powder with sulfuric acid. That is, add sulfuric acid solution in the reactor to react with manganese carbonate ore to generate manganese sulfate, and add a small amount of reducing agent when the pH value is close to 4, and the Fe in the solution 2+ Oxidize and hydrolyze the precipitate, then neutralize the excess acid with liquid ammonia; when the pH value is close to 7, add a vulcanizing agent to make the heavy metal ions in the solution form corresponding sulfide precipitates; then filter with a filter press, and the filtrate enters the electrolytic cell Electrolysis, the discharged filter cake is the so-called electrolytic manganese slag. Due to the exte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B47/00C01C1/24
CPCC01C1/24C22B7/006C22B47/00Y02P10/20
Inventor 黎贵亮詹海青詹海华黄海岛张丽云李庆梅李春霞黄炳龙
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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