竹浆硫酸盐法蒸煮预浸段硅溶出及抑制规律研究

Research on Leaching and Restraining of Silicon in Pre-impregnation Stage of Bamboo Sulfate Cooking

关键词:  竹浆  碱回收  留硅剂  溶出率

Key Words:bamboo pulp  alkali recovery  silicon-restrainer agent  leaching rate

摘要:高硅含量的竹材制浆给碱回收系统造成不利影响，且对白泥的回收利用带来很大的困难。结合贵州赤天化纸业有限公司汽-液两相双塔连续蒸煮器生产硫酸盐竹浆的生产工艺，对硫酸盐法蒸煮中预浸段硅的溶出规律及添加留硅剂对硅溶出的抑制效果进行了研究。研究发现，相同保温时间下，保温温度低于140℃时，硅的溶出速率较快且稳定，超过140℃，硅的溶出速率变慢，保温温度为100℃时，留硅剂对硅溶出的抑制效果最好；相同保温温度下，保温时间少于60 min时，硅的溶出量随时间的延长逐渐增加，60 min时，硅的溶出量达到最大，继续延长时间，硅的溶出量趋于稳定，保温时间在90~120 min时，留硅剂对硅溶出的抑制效果最好。

Abstract:In kraft pulping, high silicon content of bamboo caused negative effects on the alkali recovery system and the recycling of lime mud. The leaching pattern of silicon and the prohibiting silicon from dissolving effect of the silicon restrainer in pre-impregnating stage were investigated based on the process of steam-liquid two phase two-tower continuous cooking using in Chitianhua Paper. The result showed that the leaching rate of silicon was rapid and stable under 140℃, while it was slow when the temperature was over 140℃. The silicon restrainer effect of prohibiting silicon from dissolving was the best when the temperature was 100℃. The dissolved silicon amount increased to the maximum in 60 min, and then became stable. The restraining effect of the restrainer was the best in 90~120 min.