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Solidifying and stabilizing method of mercury in desulfurized gypsum by employing chemical bond phosphatic ceramic combined with sulfide

A technology for desulfurizing gypsum and sulfide, applied in the field of environmental engineering, can solve problems such as redissolution, and achieve the effects of fast forming speed, high mechanical properties and acid and alkali corrosion resistance

Inactive Publication Date: 2014-08-27
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solidification and stabilization method of mercury waste adopts the cement solidification method. During the cement hydration process, Hg 2+ The formation of HgO precipitates under high alkaline conditions is wrapped in silicate, which is a simple physical encapsulation effect, and it is easy to cause redissolution in the porous matrix of cement

Method used

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Experimental program
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Effect test

Embodiment Construction

[0017] Specific embodiments of the present invention will be further described below.

[0018] The process and steps of the method for stabilizing mercury in desulfurized gypsum by using chemical bond phosphate ceramics-sulfide combination in this embodiment are as follows:

[0019] (1) Mix 40g of desulfurized gypsum from a coal-fired power plant in Suzhou, Anhui, with 0.2g of sodium sulfide, add a small amount of water and mix for 30 minutes;

[0020] (2) Add 31g KH 2 PO 4 Dissolve in 20mL of water, after KH 2 PO 4 All dissolved, the sample treated in step (1) and 9g calcined dolomite were added to the solution and stirred vigorously for 30 minutes, then poured into the mold, put the mold in a standard curing box for 2 hours, and then demolded;

[0021] (3) Put the demolded module into a standard curing box to cure for 3 weeks, and get a chemically bonded phosphate ceramic material wrapped with mercury sulfide after the reaction;

[0022] (4) The above materials were sub...

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Abstract

The invention relates to a solidifying and stabilizing method of mercury in desulfurized gypsum by employing chemical bond phosphatic ceramic (CPBC) combined with a sulfide and belongs to the technical field of environment engineering. The method comprises following steps of: (1) mixing desulfurized gypsum with a certain amount of sulfide (0.5 wt%) and adding a small quantity of water with mixing to obtain a sample; (2) mixing the sample with MgO, KH2PO4 and water with strong stirring for 30 minutes to obtain a mixture, pouring the mixture into a mould and placing the mould into a standard maintenance box for 2-3 hours and then carrying out a demoulding process to obtain a demoulded block; (3) solidifying the demoulded block in a standard maintenance box for 2-3 hours; and (4) carrying out a reaction to obtain a CPBC material in which mercury is solidified. When the sample is subjected to a TCLP toxicity leaching experiment and a SPLP toxicity leaching experiment for detecting leaching toxicity of mercury in the sample, the mercury is not detected in the sample. The test result shows that the ceramic material can achieve an effect that the mercury is not leached out.

Description

technical field [0001] The invention relates to a method for solidifying and stabilizing mercury in desulfurized gypsum by using chemical bond phosphate ceramic-sulfide combination, which belongs to the technical field of environmental engineering. Background technique [0002] Mercury emitted from coal-fired flue gas is the main source of mercury pollution, and Hg in flue gas 2+ Easily soluble in water, the wet flue gas desulfurization device can absorb Hg in the flue gas through dissolution during the desulfurization process 2+ Capture it into desulfurization gypsum to achieve the purpose of purifying mercury in flue gas at the same time. Therefore, desulfurization gypsum must be stabilized and solidified for mercury before it can be landfilled. The traditional solidification and stabilization method of mercury waste adopts the cement solidification method. During the cement hydration process, Hg 2+ The formation of HgO precipitates under high alkaline conditions is wra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 吴思邈钱光人郝莹李虬梁冠男
Owner SHANGHAI UNIV