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Method for stably desulphurizing Hg(II) in gypsum

A desulfurization gypsum, stable technology, applied in the field of environmental engineering, can solve problems such as potential safety hazards, and achieve the effect of reducing the concentration

Inactive Publication Date: 2010-03-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the presence of heavy metals such as Hg in desulfurized gypsum will be discharged into the environment during the processing and use of gypsum, posing safety hazards

Method used

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  • Method for stably desulphurizing Hg(II) in gypsum
  • Method for stably desulphurizing Hg(II) in gypsum
  • Method for stably desulphurizing Hg(II) in gypsum

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Embodiment 1

[0020] Add TMT to the desulfurized gypsum slurry at a ratio of 0.6gTMT:1gHg (the actual amount added is 0.6mg / L), and the mercury removal rate of the desulfurized liquid after the reaction is 91.2%. Soak the filtered gypsum in the simulated acid rain of pH=5 for 24 hours, the mercury content in the gypsum before soaking is 68.4ug / g gypsum, after soaking 2+ The dissolution rate is 0.31ug / g gypsum, and the dissolution rate is 0.45%.

Embodiment 2

[0022] Add TMT to the desulfurized gypsum slurry at a ratio of 0.8gTMT:1gHg (the actual amount added is 0.8mg / L), and the mercury removal rate of the desulfurized liquid after the reaction is 94.2%. Soak the filtered gypsum in the simulated acid rain of pH=5 for 24 hours, the mercury content in the gypsum before soaking is 70.7ug / g 2+ The dissolution amount of the compound is 0.16ug / g gypsum, and the dissolution rate is 0.22%.

Embodiment 3

[0024] Add TMT to the desulfurized gypsum slurry at a ratio of 1gTMT:1gHg (the actual amount added is 1.0 mg / L), and the mercury removal rate of the desulfurized liquid after the reaction is 97.0%. Soak the filtered gypsum in the simulated acid rain of pH=5 for 24 hours, the mercury content in the gypsum before soaking is 72.7ug / g 2+ The dissolution amount of the compound is 0.15ug / g gypsum, and the dissolution rate is 0.21%.

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Abstract

The invention relates to a method for stably desulphurizing Hg(II) in gypsum. At present, the desulfurization gypsum generated by the wet limestone-gypsum method desulfurization contains Hg and otherheavy metals which are discharged to the environment in the processing and use processes of gypsum with safety potential. In the method of the invention, the mercury ion stabilizer is added into the desulfurization gypsum slurry generated by the wet limestone-gypsum method desulfurization according to the content of Hg<2+>; a stable mercury ion chelate is formed through the action of mercury ion stabilizer and Hg<2+> in the desulfurization gypsum slurry to ensure that the mercury ions exist in the formed desulfurization gypsum stably. The mercury ion stabilizer is the high molecular heavy metal trapping precipitant DTCR or organic sulfur TMT. The method in the invention can greatly reduce the concentration of Hg<2+> in the desulfurization gypsum, and effectively solve the problem of secondary pollution in the processing and use processes of the gypsum.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a method for stabilizing Hg(II) in desulfurized gypsum, which can effectively suppress Hg 2+ Dissolution. Background technique [0002] With the strengthening of environmental protection awareness, according to the policies and regulations of the "Eleventh Five-Year Plan for Sulfur Dioxide Control in Existing Coal-fired Power Plants" promulgated by the National Development and Reform Commission and the State Environmental Protection Power plants with coal-fired sulfur content greater than 1% must build desulfurization facilities in stages before 2010. At present, the mainstream desulfurization technology in my country is the wet limestone-gypsum method, but a large amount of flue gas desulfurization gypsum will be produced at that time. It is reported that with the launch of wet desulfurization equipment, the introduction of coal-fired thermal power desulfurizat...

Claims

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Application Information

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IPC IPC(8): A62D3/00B01D53/64B01D53/80
Inventor 汤婷媚徐新华沃静静徐江
Owner ZHEJIANG UNIV
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