Electrolytic manganese residue harmless treatment and resource utilization method

A technology of harmless treatment and electrolytic manganese slag, applied in the direction of improving process efficiency, etc., can solve the problems of low ammonia nitrogen leaching rate, inability to effectively remove heavy metals and electrolytic manganese slag, and complicated process, so as to reduce the content of heavy metals and ammonia nitrogen, The effect of shortening the leaching time and increasing the leaching rate

Active Publication Date: 2019-04-02
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the above problems in the prior art that cannot effectively remove heavy metals, manganese, and ammonia nitrogen in the electrolytic manganese slag, the leaching rate is low, and the process is complicated, the purpose of the present invention is to provide a method for harmless treatment and resource utilization of electrolytic manganese slag

Method used

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  • Electrolytic manganese residue harmless treatment and resource utilization method

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Comparison scheme
Effect test

Embodiment 1

[0024] (1) Accurately weigh 1kg of material I of electrolytic manganese slag just discharged from the filter press workshop with metering equipment, put it into the stirring reaction device, add 5kg of water and corresponding additives (0.09kg Concentrated sulfuric acid, 0.03 kg of hydrogen peroxide) fully mixed to prepare material II;

[0025] (2) Add cathode and anode plates to the reaction device equipped with the material II obtained in step (1), apply a DC electric field, and the current density is 35 mA / cm 2 , carry out the leaching reaction at 40°C for 2 h, and obtain the material III after the leaching reaction;

[0026] (3) Pour the material III obtained in step (2) into the solid-liquid separation device, and obtain the leaching residue I and material IV after separation. The residue I is mainly the leaching residue of electrolytic manganese slag, which can be used in high value-added building material additives and other fields ;

[0027] (4) Add calcium carbonate...

Embodiment 2

[0032] (1) Accurately weigh 1 kg of material Ⅰ of electrolytic manganese slag just discharged from the filter press workshop with a metering device, put it into the stirring reaction device, and add 5 kg of water and corresponding additives by weight to the reaction device using the metering system ( 0.20 kg of concentrated sulfuric acid and 0.12 kg of pyrite) are fully mixed and configured into material II;

[0033] (2) Add cathode and anode plates to the reaction device equipped with the material II obtained in step (1), apply a DC electric field, and the current density is 35 mA / cm 2 , carry out the leaching reaction at 60°C for 2 h, and obtain the material III after the leaching reaction;

[0034] (3) Pour the material III obtained in step (2) into a solid-liquid separation device, and obtain leaching residue I and material IV after separation;

[0035] (4) Add calcium carbonate and calcium oxide additives (0.02 kg calcium carbonate, 0.01 kg calcium oxide) to the material...

Embodiment 3

[0040] (1) Accurately weigh 1 kg of material Ⅰ of electrolytic manganese slag just discharged from the filter press workshop with a metering device, put it into the stirring reaction device, and add 5 kg of water and corresponding additives by weight to the reaction device using the metering system ( 0.09 kg of concentrated sulfuric acid and 0.04 kg of ferrous sulfate) are fully mixed and configured into material II;

[0041] (2) Add cathode and anode plates to the reaction device equipped with the material II obtained in step (1), apply a DC electric field, and the current density is 25 mA / cm 2 , carry out the leaching reaction at 25°C for 1 hour, and obtain the material III after the leaching reaction;

[0042] (3) Pour the material III obtained in step (2) into a solid-liquid separation device, and obtain leaching residue I and material IV after separation;

[0043] (4) Add calcium carbonate and calcium oxide additives (0.023 kg calcium carbonate, 0.013 kg calcium oxide) t...

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Abstract

The invention discloses an electrolytic manganese residue harmless treatment and resource utilization method. The electrolytic manganese residue harmless treatment and resource utilization method comprises the steps that firstly, a calcium oxide additive and a calcium carbonate additive are added into leaching liquid, and impurities such as iron, magnesium and calcium in the leaching liquid are effectively removed; secondly, the pH value of the leaching liquid is regulated through sodium hydroxide, sodium carbonate is added to react, and thus a manganese carbonate product is obtained; and finally, by adding calcium oxide, high-concentration ammonia nitrogen in filtrate is removed in an air stripping mode, escaping gas is absorbed through clear water, and the filtrate is reused. According to the electrolytic manganese residue harmless treatment and resource utilization method, the contents of heavy metal and the ammonia nitrogen in electrolytic manganese residues are effectively decreased, the manganese and ammonia nitrogen leaching time is shortened, and the leaching rates of manganese and the ammonia nitrogen in the electrolytic manganese residues are increased; and manganese in the leaching liquid is mainly recycled as manganese carbonate, a product can be directly used as electrolytic manganese residue raw materials, and in addition, the leaching liquid after a stripping reaction can be recycled.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of solid waste and resource recycling, and specifically relates to a process for removing heavy metals in electrolytic manganese slag and recovering and utilizing useful elements in leachate. Background technique [0002] Electrolytic manganese slag is the acid waste residue produced after manganese carbonate ore undergoes acid leaching, neutralization, and pressure filtration processes in the production process of electrolytic manganese metal. Electrolytic manganese slag is often acidic or weakly acidic due to its high water content, and its chemical composition is complex. Among them, heavy metal ions such as Si, Ca, Fe, Al, Mg, Cr, soluble manganese compounds, and ionic ammonia nitrogen (NH 4 + ) as the main pollutant. Due to historical and technical reasons, most of the electrolytic manganese slag is directly stockpiled at present. The long-term stockpiled electrolytic manganese s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B47/00
CPCC22B7/007C22B47/00Y02P10/20
Inventor 陈梦君舒建成田洋王小权王建义
Owner SOUTHWEAT UNIV OF SCI & TECH
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