高纯二氧化硅副产氟化氢铵新工艺的研究  

New process for joint production of high-purity silica and ammonium hydrogen fluoride

作　　者：刘烨[1] 安涛[1] 徐欢[1] 李国庭[1] 

机构地区：[1]河北科技大学化学与制药工程学院,河北石家庄050080

出　　处：《现代化工》2014年第2期65-67,共3页Modern Chemical Industry

摘　　要：以磷肥生产过程中排放的含氟废气经吸收获得的氟硅酸为原料,开发了一条高纯二氧化硅副产氟化氢铵新工艺。通过实验得出最佳的工艺条件:n(氟硅酸)∶n(氨水)=1∶3,氨水滴加速度为6 mL/min,反应温度为40℃,陈化时间为0.5 h。由此得到的二氧化硅的纯度达到了99%,且氟化氢铵符合优等品行业标准。A new process to jointly produce high-purity silica and ammonium hydrogen fluoride is introduced by using fluosilicic acid which absorbs the fluoride waste gas from the process of phosphate fertilizer production.The optimum process conditions are：1 ∶ 3 molar ratio of fluosilicic acid and ammonia water,6 mL/L of dropping speed for ammonia water,40℃ of reaction temperature,0.5 hour of aging time.The purity of silica reaches 99％ and ammonium hydrogen fluoride meets industrial standard content of superior product,reaching 98％.

关 键 词：高纯二氧化硅 氟化氢铵 氟硅酸 氨水 新工艺 

分 类 号：TQ127.2[化学工程—无机化工]