Disposal And Utilization Of Waste Kiln Dust From Cement Industry With List Of References

Author : Jiajun Wang
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Download or read book Manufacturing Kcl from Cement Kiln Bypass Ash written by Jiajun Wang and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cement kiln carrying out co-processing is typically equipped with a bypass system, to solve the problem of chlorine enrichment and circulation in the kiln. However, in such a setup, the proper disposal of bypass ash is technically difficult. In this study, the fact that chlorine and potassium are enriched in kiln dust (and bypass dust) was confirmed by tracking and analyzing the composition and phase of the fuel, raw materials, and kiln dust in a cement kiln system. Additionally, we elucidated the formation mechanism of the chlor-alkali compound, KCl, in the kiln. Furthermore, with bypass ash as a raw material, the dissolution of K+ and Cl+ ions and the removal of harmful metal ions, such as Pb2+in bypass ash, were realized by water washing and cement kiln tail flue gas treatment. The extraction rate of Cl element was 76.62 %. Based on the fact that the solubilities of different salts vary with temperature, we developed a suitable three-effect evaporation process. A KCl salt, with purity of up to 90 %, was successfully extracted from the washing solution of bypass ash, using the heat provided by the waste heat power generation system of the cement kiln. Except for KCl, all other materials could be reintroduced to the cement kiln system, without secondary pollution. In summary, in this study, we effectively solved the problem of chlorine enrichment in the co-disposal process through the bypass, while avoiding the adverse impact of Cl resulting from the waste on cement production and ensuring the quality of cement products and effective waste disposal. In addition, the entire system realized the highly innovative engineering practice of turning waste into treasure (producing high-purity sylvite products from kiln ash). The hot steam of the salt extraction process was also provided by the waste heat power generation system, which reduced the manufacturing energy consumption and had apparent environmental and economic effects. This study provides a reference for cleaner production and carbon reduction technologies and can serve as a framework for future resource utilization in the cement industry.