A production process for recovering manganese from waste water containing manganese by using waste gas

A production process and wastewater technology, applied in the direction of improving process efficiency, can solve problems such as waste, pollution, environmental pollution, etc., and achieve the effects of improving resource utilization, reducing emissions, and high yield

Inactive Publication Date: 2011-11-30
湘潭电化集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mn was extracted by washing 2+ Slag-soluble MnSO after liquid-solid separation 4 Still more than 5%, soluble manganese in manganese slag has not been effectively recovered and utilized, still causing pollution and waste
[0005] Secondly, in the production of EMM and EMD, the CO produced in the leaching process 2 Generally, it is directly discharged into the air, which increases the CO in the atmosphere 2 emissions, causing environmental pollution

Method used

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  • A production process for recovering manganese from waste water containing manganese by using waste gas
  • A production process for recovering manganese from waste water containing manganese by using waste gas
  • A production process for recovering manganese from waste water containing manganese by using waste gas

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Effect test

Embodiment 1

[0032] Such as figure 1 Shown, a kind of production technology that utilizes exhaust gas to reclaim manganese from manganese-containing waste water waste residue comprises the following steps:

[0033] a. Collection of CO produced in the electrolytic manganese metal process 2 in a gas cabinet;

[0034] b. Take the manganese slag produced in the electrolytic metal manganese process, add washing liquid to the manganese slag to adjust the pulp and wash the slag (the washing liquid added for the first time is water), the mass percentage of the manganese slag and the washing liquid is 1:3, (the manganese slag is determined here The mass percentage of slag and lotion is just for the convenience of calculating the extraction rate. In the actual process, the percentage of manganese slag and lotion should be selected and set according to the specific conditions of the production line) and stirred for 10 minutes to obtain the leaching solution;

[0035] c. Feed liquid ammonia to ...

Embodiment 2

[0041] A kind of production technology that utilizes waste gas to reclaim manganese from manganese-containing waste water waste residue, comprises the following steps:

[0042] a. Collection of CO produced in the electrolytic manganese dioxide process 2 in a gas cabinet;

[0043] b. Take the manganese slag produced in the electrolytic manganese dioxide process, add lotion to the manganese slag to adjust the pulp and wash the slag (the first added lotion is water), the mass percentage of the manganese slag and the lotion is 1:3, and stir for 10 minutes. filtered to obtain the leaching solution;

[0044] c. Add NaOH solution to adjust the pH of the leach solution to be 7-7.8, and pass into the CO in the gas cabinet described in step a. 2 , while continuously adding 10% NaOH solution evenly to maintain the pH value of the solution, react for 2 hours, and separate the solid and liquid after the precipitation to obtain MnCO 3 precipitation and filtrate;

[0045] d. The above...

Embodiment 3

[0050] Take 1Kg of manganese slag from the electrolytic manganese metal process (EMM process), wash the slag with 3Kg of water, stir thoroughly for 10 minutes, then filter, and measure the MnSO in the filtrate 4 content, calculate the extracted MnSO 4 amount.

[0051] Take 1Kg of manganese slag from the electrolytic manganese dioxide process (EMD process), wash the slag with 3Kg of water, stir thoroughly for 10 minutes, then filter, and measure the MnSO in the filtrate 4 content, calculate the extracted MnSO 4 amount.

[0052] The above-mentioned EMM process and the MnSO in the manganese slag filtrate of the EMD process 4 The content is shown in Table 1.

[0053] Table 1

[0054]

[0055] It can be seen from Table 1 that after filtration, the MnSO in waste residue in EMM process and EMD process 4 The extraction rates were 48.6% and 51.4%, respectively.

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Abstract

The invention discloses a production process for recovering manganese from manganese-containing waste water and slag by using waste gas. Add lotion to the manganese slag produced by the electrolytic manganese or electrolytic manganese dioxide process, and then filter the leaching solution after stirring fully; c. adjust the leaching solution pH to 7-7.8, and pass it into the CO2, while continuously feeding ammonia gas to react and maintain the pH value of the solution. After the reaction, solid-liquid separation is obtained to obtain MnCO3 precipitation and filtrate; d. MnCO3 precipitation is returned to the electrolytic metal manganese or electrolytic manganese dioxide process in the form of slurry, and the filtrate is used as the washing liquid Return to step b for recycling. The invention greatly improves the recovery rate of manganese in the production process of electrolytic manganese metal and electrolytic manganese dioxide, also recovers available ammonium sulfate, improves resource utilization rate, reduces CO2 and manganese emissions, and protects the environment.

Description

technical field [0001] The invention relates to a production process for recovering manganese from waste water containing manganese, in particular to a production process for recovering manganese from waste water containing manganese by using waste gas. Background technique [0002] A large amount of carbon dioxide, manganese-containing wastewater and manganese slag are produced in the production process of electrolytic manganese metal (referred to as "EMM") and electrolytic manganese dioxide (referred to as "EMD"). Carbon dioxide is produced by the reaction of manganese carbonate and sulfuric acid in the leaching process. After the leaching reaction, the liquid-solid separation is generated, and the manganese-containing wastewater is generated by the washing equipment and product rinsing process. [0003] After the leaching process in EMM and EMD production, a high-pressure diaphragm chamber filter press is used for liquid-solid separation, and the manganese slag produced h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/46C22B47/00
CPCY02P10/20
Inventor 王周亮易宾
Owner 湘潭电化集团有限公司
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