对在NaOH溶液脱除LCD粉末硅铝的过程中产生的碱废液的回收利用开展研究.通过在碱废液中加入二氧化硅粉末在微波中反应,从而提高溶液的模数来制取水玻璃.介绍了LCD粉末脱除硅铝的实验方法、水玻璃模数的快速测定方法,详述了碱废液和二氧化硅在微波中反应的主要影响因素及其实验结果,并通过ICP检测水玻璃中的杂质含量.结果表明:最佳实验条件为稀释倍数为5倍、反应温度100℃、反应时间10 min、二氧化硅添加量4.0g.在此条件下得到模数为1.95,符合工业液体硅酸钠技术指标的水玻璃.该方法将为LCD粉末脱除硅铝处理过程中废碱液的资源化利用提供新思路.%The recycle of alkali waste liquid produced during silicon and aluminum removal of liquid crystal display (LCD) powder in NaOH solution was studied in this paper.Silicon dioxide powder was added into alkali waste liquid for reaction in microwave,to improve modulus of solution and make water glass.The experimental method on silicon and aluminum removal of LCD powder and quick measurement method of modules of water glass were introduced.Then description was given on main influence factors and experimental results of reaction of alkali waste liquid and silicon dioxide in microwave.Besides,impurity content in water glass was detected via ICP.The optimized experimental conditions included 5 times of dilution ratio,100 ℃ of reaction temperature,10 min of reaction time and 4.0 g of additive amount of silicon dioxide.Water glass with modulus of 1.95,meeting the industrial liquid sodium silicate technical index requirement,was gained under this condition.
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