响应曲面法优化稻壳灰中二氧化硅的提取工艺

Silica Extraction Process from Rice Husk Ash Using Response Surface Methodology

研究稻壳灰中的SiO_(2)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SiO_(2)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SiO_(2)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。

This study investigates the efficient solubility of SiO_(2in) rice husk ash under low concentration alkaline conditions.Firstly,single factor experiments were conducted on four factors:temperature,Na OH concentration,time,and liquid-solid ratio.Then,a combination experiment was designed using three factors:temperature,Na OH concentration,and time,with SiO_(2dissolution) rate as the evaluation index.The results showed that the temperature was 124 ℃,the mass fraction of Na OH was 8%,the time was 1.5 hours,and the liquid-solid ratio was 10:1(m L:g).Under this condition,multiple experiments have shown that the dissolution rate of Si O_(2)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.