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Cycling separation method for manganous dithionate in desulfurized liquid

A technology of manganese dithionate and separation method, which is applied in the field of purification and separation, can solve problems such as product quality impact, and achieve the effect of reducing process costs

Active Publication Date: 2015-05-27
贵州红星发展大龙锰业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem solved by the present invention is to provide a method for circulating and separating manganese dithionate in desulfurization liquid, which solves the impact on product quality caused by manganese flue gas desulfurization manganese dithionate

Method used

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  • Cycling separation method for manganous dithionate in desulfurized liquid

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Embodiment 1

[0056] (1) Desulfurization

[0057] Commercially available manganese dioxide ore powder with a particle size of 90% less than 147 μm (through a 100 mesh sieve) and a manganese content of 20% by weight is formulated into a material with a solid content of 25% by weight with ammonium sulfate solution. Slurry, the slurry is subjected to three-stage countercurrent gas-liquid reaction with sulfur-containing flue gas, and the gas velocity of sulfur-containing flue gas is controlled to be ≤1.5m / sec, and the gas-liquid ratio is 8L / m 3 , for gas-liquid reaction, to the MnO in the slurry 2 The weight percent content is less than 2%; after the reaction is finished, the slurry is neutralized to pH 6.0 with a small amount of lime, separated by pressure filtration, and the obtained filtrate enters the next step of operation. Wash the residue obtained by pressure filtration and separation, and the washing water is used to prepare manganese dioxide slurry. During the desulfurization process...

Embodiment 2

[0065] (1) Desulfurization

[0066] Commercially available manganese dioxide ore powder with a particle size of 90% less than 147 μm (through a 100 mesh sieve) and a manganese content of 45% by weight is formulated into a material with a solid content of 30% by weight with ammonium sulfate solution. Slurry, the slurry is subjected to three-stage countercurrent gas-liquid reaction with sulfur-containing flue gas, and the gas velocity of sulfur-containing flue gas is controlled to be ≤1.5m / sec, and the gas-liquid ratio is 12L / m 3 , for gas-liquid reaction, to the MnO in the slurry 2 The weight percent content is less than 1.5%; after the reaction is finished, the slurry is neutralized to pH 6.5 with a small amount of lime, separated by pressure filtration, and the obtained filtrate enters the next step of operation. Wash the residue obtained by pressure filtration and separation, and the washing water is used to prepare manganese dioxide slurry. During the desulfurization proc...

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Abstract

The invention provides a cycling separation method for manganous dithionate in desulfurized liquid. The method comprises the following steps: (1) desulfurization: carrying out multi-stage countercurrent gas-liquid reaction between slurry containing manganese dioxide ore and ammonium sulfate with flue gas containing sulphur, and carrying out pressure filtration and separation; (2) sulfuration and acidification: introducing a filtrate obtained in step (1) into a hydrogen sulfide gas for sulfuration reaction, carrying out pressure filtration and separation, and acidifying a filter cake to obtain hydrogen sulfide and manganese sulfate products; (3) aftertreatment cycling working procedure: neutralizing the filtrate obtained in step (2) by sulfuration and acidification to reach pH of 7-7.0, carrying out pressure filtration and separation, returning the filtrate to prepare slurry by desulfurization for recycling, and using filter residue for preparing a building material. The method can separate 99.95%-99.96% of manganous dithionate in a manganese sulfate solution.

Description

technical field [0001] The invention relates to the technical field of purification and separation, in particular to a method for circulating and separating manganese dithionite in sulfur-containing flue gas desulfurization liquid. Background technique [0002] It is difficult for smoke-fired boilers, especially power plant boilers, to meet the new emission standards by using the traditional calcium desulfurization method. Acidic manganese oxide desulfurization can operate stably and control the sulfur dioxide in the flue gas to less than 400 mg / m3. Manganese dithionate will be produced during gas desulfurization, which will have a great negative impact on the electrolysis operation. At present, the most reported treatment method is to decompose manganese dithionate, but the process cost is relatively high. Contents of the invention [0003] The technical problem solved by the present invention is to provide a method for circulating and separating manganese dithionate in ...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/96B01D53/50C01G45/10
Inventor 华东罗建平蒋友良
Owner 贵州红星发展大龙锰业有限责任公司
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