摘要
针对磷肥生产过程中产生的低质量分数氟硅酸不便利用或只能生产低价氟硅酸钠的问题,本文进行了采用氢氧化钾碱解副产的氟硅酸制备高价值化工产品氟化钾副产白炭黑的工艺研究,探讨了反应温度、氢氧化钾质量分数、反应终点pH值等因素对磷肥副产氟硅酸制备氟化钾的纯度和收率的影响,确定了适宜的工艺条件:反应温度为75℃、氢氧化钾质量分数为50%、反应终点pH值为9.0。在此条件下,制得的氟化钾产品纯度为98.43%,收率为78.15%;将白炭黑一次洗涤液返回系统循环使用,氟化钾产品纯度可维持在98%以上,而收率大于90%,能达到工业无水氟化钾产品的质量要求。
To address the problem that the low-concentration fluosilicic acid generated in the production of phosphate fertilizer is inconvenient to be used or can only produce low-grade sodium fluosilicate, the process for production of by-product silica of po- tassium fluoride of high-value chemical products from by-product fluosilieic acid of alkali-hydrolyzable potassium hydroxide was studied and the effects of reaction temperature, concentration of potassium hydroxide, pH value at the end of reaction and other factors on purity and yield of by-product fluosilicic acid of phosphate fertilizer were explored. The optimum process conditions were defined to be 75 ℃at reaction temperature, concentration of KOH 50% and pH value of reaction at the end of reaction 9.0. Under such conditions, the produced potassium fluoride was 98.43%in purity and was 78.15% in yield. The primary washing liquid of silica was returned to the system for recycling and the purity of potassium fluoride could remain above 98% and the yield was greater than 90% to meet the requirements of industrial anhydrous potassium fluoride products in quality.
作者
周丹
魏新宇
龚翰章
ZHOU Dan WEI. Xin-yu GONG Han-zhang(Wuhuan Enginering Co. ,Ltd. ,Wuhan Hubei 430000, China Wuhan Institute of Technology, Chemical and Pharmaceutical College, Wuhan Hubei 430073, China)
出处
《化工矿物与加工》
北大核心
2017年第8期28-31,共4页
Industrial Minerals & Processing
关键词
氟硅酸
氟化钾
工艺研究
fluosilicic acid
potassium fluoride
process research
