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Desulfurization absorption liquid capable of simultaneously stabilizing bivalent mercury

A technology for absorbing liquid and divalent mercury, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of deterioration of slurry, equipment wear, poor effect, etc., and achieves suppression of reduction, recycling of resources, and efficient desulfurization. effect of effect

Active Publication Date: 2013-04-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, some domestic power plants use calcium carbide slag as the absorbent in the established wet limestone-gypsum flue gas desulfurization process. High pH, ​​but higher pH reduces CaSO 3 Oxidation rate, unable to obtain stable by-products; (2) Ca(OH) 2 Generate CaCl with a large amount of Cl- ions 2 , resulting in difficulty in dehydration; (3) a certain content of SiO 2 cause wear and tear on equipment
However, excess CaSO 3 will be coated in unreacted CaCO 3 On the contrary, it will deteriorate the slurry, reduce the utilization rate of the absorbent, and further affect the quality of desulfurization by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mass ratio of calcium carbide slag (industrial waste discharged during the production of acetylene from calcium carbide) to MgO in the absorption liquid is 20:100, the solid concentration of the slurry is 10%, the volume is 5L, the pH is controlled at 4-10, and the temperature is controlled At around 45°C, bubble SO with a concentration of 200ppm into the slurry 2 And the concentration is 80ug / m 3 The mixed gas of divalent mercury, the gas flow rate is 10L / min. After passing through the absorption liquid for 2 hours, SO in the tail gas 2 The concentration is 15ppm, the total mercury concentration is 5ug / m 3 , The desulfurization efficiency is 92.5%; , The total mercury removal efficiency is 94%.

Embodiment 2

[0030] The mass ratio of calcium carbide slag (industrial waste discharged during the production of acetylene from calcium carbide) to MgO in the absorption liquid is 5:100, the solid concentration of the slurry is 10%, the volume is 5L, the pH is controlled at 4-10, and the temperature is controlled At around 45°C. Bubble SO at a concentration of 200ppm into the slurry 2 And the concentration is 80ug / m 3 The mixed gas flow rate of divalent mercury is 10L / min. After passing through the absorption liquid for 2 hours, SO in the tail gas 2 The concentration is 8ppm, the total mercury concentration is less than 24ug / m 3 , the desulfurization efficiency is 95%; the mercury removal efficiency is 70%.

Embodiment 3

[0032] The mass ratio of calcium carbide slag (industrial waste discharged during the production of acetylene from calcium carbide) to MgO in the absorption liquid is 30:100, the solid concentration of the slurry is 10%, the volume is 5L, the pH is controlled at 4-10, and the temperature is controlled At around 45°C. Bubble SO at a concentration of 200ppm into the slurry 2 And the concentration is 80ug / m 3 The mixed gas of divalent mercury, the gas flow rate is 10L / min. After passing through the absorption liquid, the tail gas concentration SO 2 48ppm, the total mercury concentration is less than 7ug / m 3 , the desulfurization efficiency is 76%; the mercury removal efficiency is 91.25%.

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PUM

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Abstract

The invention discloses a desulfurization absorption liquid capable of simultaneously stabilizing bivalent mercury. The desulfurization absorption liquid is obtained by mixing acetylene sludge and a metal oxide, wherein the mass percent of the acetylene sludge to the metal oxide is (5-40):100, the metal oxide is one or a mixture of more than one of CaO, MgO, ZnO, MnO2, and CuO. The absorption liquid disclosed by the invention not only has an efficient desulfurization effect, but also is capable of effectively inhibiting the reduction of the bivalent mercury in a liquid phase, and because the metal oxide and the main ingredient of the acetylene sludge both belong to metal oxides which are similar in property, the problem caused by direct acetylene sludge desulfurization can be prevented by adding the acetylene sludge and the metal oxide in proper proportion.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a desulfurization absorbing liquid that simultaneously stabilizes divalent mercury. Background technique [0002] Mercury is a highly toxic substance that is bioaccumulative, persistent, and transportable over long distances. Long-term exposure to mercury-polluted environments will cause great harm to human health, and even have irreversible effects on the nervous system during the critical period of infant growth. Additionally, mercury is converted in the natural environment to the more toxic form of methylmercury. Coal-fired power plants and industrial coal-fired boilers are the main sources of anthropogenic mercury emissions, accounting for more than 40% of the total anthropogenic mercury emissions. However, these stationary sources have large emissions, complex compositions, and low concentrations of mercury, which pose great challenges to the removal of mercu...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D53/64
Inventor 吴忠标王青峰刘越王海强翁小乐梅荣军
Owner ZHEJIANG UNIV
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