摘要
研究了不经脱氟、采用硫酸法制备饲料级磷酸氢钙,考察了搅拌速度、硫酸用量、反应温度、反应时间、中和终点pH、静置时间等对饲料级磷酸氢钙中氟质量分数的影响。结果表明,对于30 g磷矿石,在搅拌速度400 r/min、浓硫酸用量25 mL、反应温度75℃、反应时间3 h、中和终点pH=6、静置时间3 h条件下,所得磷酸氢钙中氟质量分数仅0.08%,达到饲料级磷酸氢钙质量要求。
The preparation of feed-grade calcium hydrogen phosphate by sulfuric acid method without defluorinal was studied.The effects of stirring rate,sulfuric acid dosage,reaction temperature and time,neutralization end-point pH and settling time on fluorine mass fraction in calcium hydrogen phosphate were examined.The results show that for 30 g phosphate ore,under the optimum conditions of stirring rate of 400 r/min,sulfuric acid dosage of 25 mL,reaction temperature of 75℃,reaction time of 3 h,neutralization end-point pH of 6.0 and settling time of 3 h,feed-grade calcium hydrogen phosphate with fluorine mass freaction of 0.08%is obtained.
作者
刘洪波
刘安荣
彭伟
王振杰
LIU Hongbo;LIU Anrong;PENG Wei;WANG Zhenjie(Guizhou Institute of Metallurgy and Chemical Engineering,Guiyang 550016,China)
出处
《湿法冶金》
CAS
北大核心
2020年第5期415-418,共4页
Hydrometallurgy of China
基金
贵州省科技重大专项项目(黔科合重大专项字[2019]3004)
贵州省科技计划项目(黔科合成果[2019]4249号,黔科合成果[2019]4253号)。
关键词
硫酸法
无脱氟
低氟
饲料级
制备
磷酸氢钙
sulfuric acid method
no-defluorination
low fluoride
feed-grade
preparation
calcium hydrogen phosphate
