Harmless treatment method of electrolytic manganese slag

A technology of harmless treatment and electrolysis of manganese slag, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., can solve problems such as surrounding environmental pollution, threats to the health of surrounding residents, a large amount of waste gas, etc., and reach the time required for the process short, realize diversified recycling, and reduce the effect of environmental protection pressure

Active Publication Date: 2020-02-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, electrolytic metal manganese anode slag is mainly used to produce ferromanganese alloy, but a large amount of waste gas and Pb-containing smoke and dust are generated during the treatment process, which causes serious pollution to the surrounding environment and poses a serious threat to the health of surrounding residents.

Method used

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  • Harmless treatment method of electrolytic manganese slag

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] A harmless treatment method of electrolytic manganese slag of the present invention, the process flow chart is as follows figure 1 shown, including the following steps:

[0049] (1) Dry the electrolytic manganese slag taken from the slag factory, crush the dried electrolytic manganese slag with a powder machine or a crusher to less than 100 mesh, and use a rotary kiln to cool the electrolytic manganese slag at a low temperature of 550°C Roasting for 90min to obtain the calcined material and produce NH-containing 3 and SO 2 smoke.

[0050] (2) Slurry the calcined material obtained in step (1) with water according to the liquid-solid ratio of 3: 1mL / g, then place the obtained slurry in a water bath at 40°C, stir and immerse in water, react for 30 minutes, and then press filter A press filter residue and a manganese-containing filtrate are obtained.

[0051] (3) Dry the press filter residue obtained in step (2) to obtain harmless manganese slag, add the oxalic acid sol...

Embodiment 2

[0057] A harmless treatment method of electrolytic manganese slag of the present invention, the process flow chart is as follows figure 1 shown, including the following steps:

[0058] (1) Dry the electrolytic manganese slag taken from the slag factory, crush the dried electrolytic manganese slag with a powder machine to below 100 mesh, and roast the crushed electrolytic manganese slag at 600°C for 60 minutes in a rotary kiln to obtain Roasted material, and produces NH-containing 3 and SO 2 smoke.

[0059] (2) Slurry the calcined material and water obtained in step (1) according to the liquid-solid ratio of 8: 3mL / g, then place the obtained slurry in a water bath at 50°C with stirring and water immersion, react for 30 minutes, and then press filter to obtain Press filter residue and filtrate containing manganese.

[0060] (3) Dry the press filter residue obtained in step (2) to obtain harmless manganese slag, add the oxalic acid solution to the manganese-containing filtrat...

Embodiment 3

[0066] A harmless treatment method of electrolytic manganese slag of the present invention, the process flow chart is as follows figure 1 shown, including the following steps:

[0067] (1) Dry the electrolytic manganese slag taken from the slag factory, crush the dried electrolytic manganese slag with a powder machine to below 100 mesh, and roast the crushed electrolytic manganese slag at 600°C for 60 minutes in a rotary kiln to obtain Roasted material, and produces NH-containing 3 and SO 2 smoke.

[0068] (2) Slurry the calcined material and water obtained in step (1) according to the liquid-solid ratio of 8: 3mL / g, then place the obtained slurry in a water bath at 50°C with stirring and water immersion, react for 30 minutes, and then press filter to obtain Press filter residue and filtrate containing manganese.

[0069] (3) Dry the press filter residue obtained in step (2) to obtain harmless manganese slag, add the oxalic acid solution to the manganese-containing filtrat...

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Abstract

The invention discloses a harmless treatment method of an electrolytic manganese residue. The harmless treatment method comprises the following steps that (1) the electrolytic manganese slag is driedand crushed and then subjected to low-temperature roasting to obtain a calcined material, and flue gas containing NH3 and SO2 is generated; (2) the obtained calcined material is subjected to water immersion and then subjected to solid-liquid separation to obtain a filter residue and manganese-containing filtrate; (3) the filter residue obtained from the separation is dried to obtain a harmless manganese residue, a precipitant is added to the manganese-containing filtrate to precipitate manganese, and after the completion of manganese precipitation, the solid-liquid separation is performed to obtain manganese-precipitated post-liquid and a manganese-containing product. The harmless treatment method of the electrolytic manganese residue is simple in process, mild in process conditions, shortin time required for the flow path and low in cost, and can effectively realize the harmless resource treatment of the electrolytic manganese residue, environmental protection is achieved, and the environmental protection pressure and production cost of related enterprises are reduced.

Description

technical field [0001] The invention relates to the field of recovery and treatment of metallurgical solid waste and low-grade refractory mineral resources, and relates to a harmless treatment method for electrolytic manganese slag. Background technique [0002] Electrolytic manganese slag is a kind of acid leaching filter residue produced after adding sulfuric acid solution to leach rhodochrosite ore powder or pyrolusite ore powder to prepare electrolytic manganese solution. The appearance of the electrolytic manganese slag is a black powder aggregate with a certain viscosity, the water content is generally 25% to 35%, and the pH is 5.0 to 6.5. [0003] China is the world's largest producer, consumer and exporter of electrolytic manganese. Its manufacturers are mainly concentrated in the "manganese triangle" (the junction of Hunan, Guizhou and Chongqing), Guangxi and Ningxia. In 2017, China's annual output of electrolytic manganese exceeded 1.5 million tons. Electrolytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B7/00C22B47/00C22B13/00C22B11/00C22B26/22C07C51/41C07C55/07C01G45/00
CPCC01G45/00C07C51/412C22B1/02C22B7/006C22B11/044C22B13/045C22B26/22C22B47/00C07C55/07Y02P10/20
Inventor 何仕超刘志宏刘智勇夏隆巩李启厚姚伟马欢张涛
Owner CENT SOUTH UNIV
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