煤矸石酸浸渣-硫酸钠碳热法制备水玻璃的实验研究

摘要

In order to easily prepare sodium silicate by dry method using coal gangue and sodium sulfate, 98% sulfuric acid as acid medium, silica-rich acid leaching residue is obtained using microwave heating method to extract acid soluble substances from coal gangue. silicon dioxide of acid leaching slag with Sodium oxide of sodium sulfate are mixed according to the modulus of 1.0 to produce low modulus sodium silicate. Coke mass, the calcining temperature, calcining time, cooling method, melting temperature, dissolving time, liquid-solid ratio on the inlfuence of silica dissolution rate are studied. The results show that, under the optimal process conditions: Coke mass is 17.0% of the sodium sulfate, the calcining temperature of 1100℃, the melting time of 1 h, water quenching for cooling, liquid-solid ratio of 10∶1, dissolution temperature of 80℃, dissolution time of 90 min, dissolution rate of silica reaches 72.56%, modulus of liquid water glass is 1.24.%为了便于利用煤矸石酸浸渣-硫酸钠干法制备水玻璃，用98%硫酸作酸浸介质、微波进行辅助加热直接浸取煤矸石中酸溶物，制备富含硅的酸浸渣。按酸浸渣中二氧化硅与硫酸钠中氧化钠摩尔比1.0配料干法生产低模数水玻璃。研究了焦炭量、煅烧温度、煅烧时间、冷却方式、溶解温度、溶解时间、液固比对二氧化硅溶出率的影响。结果表明，最佳工艺条件为：焦炭量为硫酸钠质量的17.0%，煅烧温度1100℃，熔融时间1 h，冷却方式为水淬骤冷，液固质量比为10∶1，溶解温度80℃，溶解时间90 min，此条件下二氧化硅溶出率为72.56%，液体水玻璃模数为1.24。