Flaky calcium hydroxide flue gas desulfurizer with high specific surface area as well as preparation method and application of flaky calcium hydroxide flue gas desulfurizer

Through the method of primary and secondary digestion, calcium hydroxide modified with tertiary amine group-containing alcohol amine and lignin sulfonate were used to prepare a sheet-like high specific surface area calcium hydroxide flue gas desulfurizer, which solved the problems of high cost and environmental pollution in the prior art, and achieved efficient and low-cost flue gas desulfurization effect.

CN119869183APending Publication Date: 2025-04-25SHANDONG LAIGANG ENERGY SAVING ENVIRONMENTAL PROTECTION ENG +1
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Patent Information

Application Number
CN202510111380.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-23
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

In the existing dry flue gas desulfurization technology, the preparation of high specific surface area calcium hydroxide desulfurization agents requires the addition of additives that have negative effects on the environment or are expensive, resulting in high costs and environmental pollution.

Method used

A flake-like high specific surface area calcium hydroxide flue gas desulfurizer was prepared by mixing quicklime with an aqueous alcohol amine solution containing tertiary amine groups for one digestion, and then adding a lignin sulfonate aqueous solution for secondary digestion.

Benefits of technology

This method effectively increases the specific surface area of ​​calcium hydroxide, extends the penetration time of the desulfurizer, significantly enhances the desulfurization efficiency, reduces preparation costs, and reduces environmental pollution.

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Abstract

The invention provides a flaky calcium hydroxide flue gas desulfurizer with high specific surface area, a preparation method thereof and application of the desulfurizer in flue gas desulfurization. The material is prepared by the following method: mixing quick lime with a tertiary amine group-containing alcohol amine aqueous solution, carrying out primary digestion, drying, grinding and roasting after the reaction is finished to obtain a precursor, adding the precursor into a lignosulfonate aqueous solution, carrying out secondary digestion, centrifuging, washing and drying to obtain the modified lignosulfonate. The flaky calcium hydroxide desulfurizer with the high specific surface area is obtained. The calcium hydroxide desulfurizer prepared by the invention has excellent specific surface area, can efficiently desulfurize flue gas, and is generally suitable for dry removal of SO2 with medium and low concentration. Moreover, the preparation method provided by the invention is simple, efficient, economical, feasible and environment-friendly, equipment and instruments required in the preparation process are simple and convenient to operate, high-batch preparation of the desulfurizing agent can be realized, and compared with other flue gas purification modes, the investment and operation cost can be effectively reduced.
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Citation Information

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