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Process for improving quality of phosphorus chemical industry waste smoke desulfurization gypsum

A technology for desulfurizing gypsum and waste flue gas, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problem of reducing the generation rate of new gypsum nuclei, increasing the driving force of crystal growth, and detecting errors prone to slurry, etc. problem, to achieve the effect of reducing the water content of gypsum, improving the quality of gypsum, and low water content

Inactive Publication Date: 2013-11-27
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the supersaturation of the slurry, the invention performs a corresponding stirring operation on the slurry, so that the supersaturation of each region of the slurry in the slurry pool is kept within the metastable range of crystallization, reducing the new nucleation rate of gypsum, and increasing the existing There is a driving force for crystal growth of small grains, thereby improving the quality of gypsum, but the method of the invention is relatively complicated to operate, and errors are prone to occur in detecting the supersaturation of the slurry when the flue gas desulfurization system is running

Method used

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  • Process for improving quality of phosphorus chemical industry waste smoke desulfurization gypsum
  • Process for improving quality of phosphorus chemical industry waste smoke desulfurization gypsum
  • Process for improving quality of phosphorus chemical industry waste smoke desulfurization gypsum

Examples

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Embodiment 1

[0027] According to the above process, a phosphoric acid production enterprise, phosphoric acid tail gas 60000m 3 / h, based on orthophosphoric acid, the phosphorus content in the flue gas is 500mg / m 3 , sulfur dioxide concentration at 2500mg / m 3 about. With quicklime as the desulfurizing agent, the mass percent concentration of the desulfurizing absorbent in the slurry is 25%, the mass concentration of sodium dodecylbenzenesulfonate in the additive mixture liquid is 200mg / L in terms of active matter, and the mass concentration of adipic acid is 6g / L, the additive mixed solution is mixed with the overflow liquid in a ratio of 1:3, the mass percent concentration of the desulfurization absorbent in the slurry after mixing is 19%, and the mass concentration of sodium dodecylbenzenesulfonate is 50mg / L L, the mass concentration of adipic acid is 1.5g / L, the pH value of the slurry in the absorption tower is 5.3, and the concentration of sulfur dioxide at the outlet is 120mg / m 3 Ar...

Embodiment 2

[0029] According to the flow process of embodiment 1, a certain enterprise penta-sodium phosphoric acid production boiler, penta-sodium phosphoric acid tail gas 153000m 3 / h, based on orthophosphoric acid, the phosphorus content in the flue gas is 800mg / m 3 , the concentration of sulfur dioxide is 2300mg / m 3 about. Limestone is used as the desulfurizing agent, the mass percent concentration of the desulfurizing absorbent in the slurry is 25%, the concentration of sodium dodecylbenzenesulfonate in the additive mixture liquid is 240mg / L in terms of active matter, and the concentration of adipic acid is 9g / L, the additive mixed solution is mixed with the overflow liquid in a ratio of 1:5, the mass percent concentration of the desulfurization absorbent in the slurry after mixing is 20.7%, and the mass concentration of sodium dodecylbenzenesulfonate is 40mg / L, The mass concentration of adipic acid is 1.5g / L, the pH value of the slurry in the absorption tower is 4.5, and the conc...

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Abstract

The invention discloses a process for improving the quality of phosphorus chemical industry waste smoke desulfurization gypsum, and the process comprises the following steps: mixing a desulphurized absorbent with slag washing water; stirring to form an even slag slurry; carrying out rotational flow separation on the slag slurry; removing bottom flow slag to obtain an overflowing liquid; configuring additive mixed liquor; mixing and stirring the additive mixed liquor and the overflowing liquid to obtain even size; contacting the size with the phosphorus chemical industry smoke; adsorbing sulfur dioxide and phosphorus compound in the phosphorus chemical industry smoke; carrying out airoxidation to form a gypsum liquid; carrying out the rotational flow separation on the gypsum to obtain top flow liquid and bottom flow desulfurization gypsum liquid; reusing the top flow liquid; and dewatering the bottom flow desulfurization gypsum liquid to obtain the desulfurization gypsum. According to the process disclosed by the invention, the problems of small desulfurization gypsum crystalline particle and difficulty in separation in the phosphorus chemical industry waste smoke desulfurization system are solved, gypsum crystal with big particle and low moisture content is obtained, and the filtering performance of the gypsum is improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection desulfurization, in particular to a process for improving the quality of desulfurization gypsum from phosphorus chemical waste flue gas. Background technique [0002] Wet lime / limestone-gypsum desulfurization method is the most commonly used and mature method in flue gas desulfurization treatment. In the process of phosphoric acid and phosphate production, boiler flue gas inevitably contains phosphide, and phosphorus chemical waste flue gas enters the desulfurization system, and phosphorus-containing compounds in the flue gas will also enter the desulfurization slurry. Phosphorus-containing compounds in the desulfurization slurry will not only affect the dissolution of desulfurization absorbent and the oxidation of calcium sulfite, but also affect the crystallization of gypsum, making the gypsum slurry viscous, and the gypsum crystal particle size is fine, and the particle size is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18B01D53/78B01D53/50
Inventor 程常杰刘兴利莫建松吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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