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％.
出处
《现代化工》
CAS
CSCD
北大核心
2014年第2期65-67,共3页
Modern Chemical Industry
关键词
高纯二氧化硅
氟化氢铵
氟硅酸
氨水
新工艺
high-purity silica
ammonium hydrogen fluoride
fluosilicic acid
ammonia water
new process
