摘要
以液晶屏抛光废液为原料制备冰晶石,首先加入碳酸钠,反应生成氟硅酸钠沉淀,去除废液中的氟硅酸根;再向滤液中加入NaOH和NaAlO2混合溶液,反应生成冰晶石。最佳工艺条件为:碳酸钠加入量为理论加入量的2.2倍,冰晶石制备反应温度为80℃,反应原料中n(HF)∶n(NaAlO2)为5.4、n(Na)∶n(Al)为3.4、NaOH和NaAlO2质量分数为20%。在最佳条件下制得的冰晶石产品中n(Na)∶n(Al)为2.84,达到GB/T 4291—2007《冰晶石》中牌号CH-1的质量标准。采用该工艺可实现液晶屏抛光废液的资源化综合利用。
Cryolite was prepared using waste LCD screen polishing liquor as raw material.First,sodium carbonate was added into the liquor and the generated sodium fluorosilicate precipitate was removed by filtration;Then,NaOH and NaAlO2 mixed solution was added into the filtrate to generate cryolite.The optimum process conditions are as follows： sodium carbonate dosage 2.2 times larger than theoretical value,reaction temperature for cryolite preparation 80 ℃,n（HF）∶n（NaAlO2）=5.4,n（Na）∶n（Al）=3.4,mass fraction of NaOH and NaAlO2 20%.Under these conditions,n（Na）∶n（Al） of the prepared cryolite is 2.84,which can meet the quality standards of GB/T4291-2007 for CH-1.The reutilization of waste LCD screen polishing liquor can be realized with the process.
出处
《化工环保》
CAS
CSCD
北大核心
2013年第2期154-157,共4页
Environmental Protection of Chemical Industry
关键词
液晶屏抛光液
氟硅酸钠
冰晶石
锥冰晶石
综合利用
LCD screen polishing liquor
sodium fluorosilicate
cryolite
chiolite
comprehensive utilization
