苛化工段电石渣部分替代石灰的生产实践及工艺改进

Production Practice and Technical Improvement of Using Carbide Slag Instead of Lime for Causticization

关键词:  电石渣  苛化  碱回收  替代石灰

Key Words:carbide slag  causticization  alkali recovery  instead of lime

摘要:以电石渣替代石灰进行绿液苛化，并进行生产中试，对中试过程中遇到的电石渣配比不稳定、消化乳液温度下降、过量石灰增加、白泥不易脱水等问题提出了具体的解决办法。在电石渣替代率20%（以有效CaO计）的情况下，对现有生产系统无影响。

Abstract:The use of carbide slag as a substitute for lime in the green liquor causticization process was studied and subsequently carried out in a pilot production trial. Specific solutions were proposed for the problems， such as the unstable proportion of carbide slag， the decrease in the temperature of digested emulsion， the increase in excess lime， and the difficulty in dewatering of white mud that were encountered during the pilot process. With a carbide slag substitution rate of 20% （calculated as effective CaO）， the existing production system was not affected.