Method for treating white mud produced by papermaking and use of the white mud treated by the method in removal of CO2 in tail flue gas from coal-fired boiler

Abstract

The invention discloses a method for treating white mud produced by papermaking. The method is characterized in that through multistage washing filtration and solar energy drying of white mud produced by papermaking, impurity ions such as Na, K and Cl producing adverse effects on white mud carbonation are removed and the white mud produced by papermaking and treated by the method can be used as a CO2 absorbent. A research result shows that through multistage washing filtration and solar energy drying, the CO2 cyclic-trapping performance of the white mud treated by the method is greatly improved. The method provided by the invention realizes a process route combining recycling application of white mud produced by papermaking, and removal of CO2 discharged by a coal-fired boiler. The method provided by the invention has simple and convenient processes, a small investment, a low cost and good industrial application prospects.

Description

technical field [0001] The invention relates to a treatment process of papermaking white mud, and the removal of CO in the tail flue gas of a coal-fired boiler by the treated papermaking white mud. 2 The application belongs to the field of environmental pollutant prevention and clean combustion technology. Background technique [0002] Combustion of fossil fuels such as coal, oil, and natural gas emits a large amount of CO 2 , causing a serious greenhouse effect and posing a great threat to the human living environment. How to control CO 2 Emissions have become the focus and difficulty of research by scholars from all over the world. my country uses coal as the main primary energy source to control the CO of coal-fired power stations 2 Emissions have reached a critical point. [0003] CO 2 Separation and storage technologies are considered to be the main ways to reduce carbon emissions in the short term. Researchers have proposed a variety of CO 2 Separation and capt...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned prior art, the present invention provides a treatment process for paper-making lime mud, which carries out multi-stage water washing filtration and solar drying treatment to paper-making white mud, which can effectively remove Na, K and Cl in the white mud, etc. Set CO 2 Elements that have adverse effects, thereby improving the problem of low carbonation conversion rate during the cyclic calcination / carbonation process of paper-making lime mud, and enhancing the anti-sintering performance of the absorbent during high-temperature calcination. Therefore, the treated paper-making lime mud can be Used to remove CO from the tail gas of coal-fired boilers 2

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