摘要
研究稻壳灰中的SiO2 在低浓度碱性条件下的高效溶解性,首先对温度、NaOH浓度、时间、液固比 4 个因素进行单因素实验,然后选取温度、NaOH浓度、时间3 个因素设计组合实验,以SiO2 溶出率为考察指标.结果表明:温度 124℃、NaOH质量分数 8%、时间1.5 h、液固比(mL∶g)10∶1.该条件下,多次实验得到SiO2 的溶出率达98%.此研究对稻壳农业废弃物的回收及资源化化利用提供了技术支持,不仅将其变废为宝,还能保护生态环境.
Abstract
This study investigates the efficient solubility of SiO2 in rice husk ash under low concentration alkaline conditions.Firstly,single factor experiments were conducted on four factors:temperature,NaOH concentration,time,and liquid-solid ratio.Then,a combination experiment was designed using three factors:temperature,NaOH concentration,and time,with SiO2 dissolution rate as the evaluation index.The results showed that the temperature was 124℃,the mass fraction of NaOH was 8%,the time was 1.5 hours,and the liquid-solid ratio was 10:1(mL:g).Under this condition,multiple experiments have shown that the dissolution rate of SiO2 reaches 98%.This study provides technical support for the recycling and resource utilization of rice husk agricultural waste,not only turning it into treasure,but also protecting the ecological environment.
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