铝盐改性膨润土的脱附研究

Study on the Desorption of Aluminum Salts Modified Bentonite

利用中性法、酸法、碱法等对除硅使用后的铝盐改性膨润土(Si-Al MB)进行脱附,达到二次利用的目的,使铝盐改性膨润土在生产应用中得以循环使用。对比不同的脱附方法的脱附效果,其中中性法几乎没有脱附作用,但可以洗去除硅使用后的铝盐改性膨润土的颜色;酸法脱附效果有限,碱性法脱附效果最优,得到最佳的脱附工艺为:将2 g除硅使用后的铝盐改性膨润土(Si-Al MB)加入到150 m L浓度为2 mol·L-1 Na OH中,温度80℃,搅拌转速为1000 r·min-1的条件下反应20 min,反应后脱附量能够达到112.11 mg·g-1,此时脱附率可达76.79%。

The methods of neutral, acid, alkaline process to desorb silicon from aluminum salt modified bentonite after applied desorption were used for achieving the purpose of secondary use in orderand to make the modified bentonite recycled in the production. Comparing the effect of different desorption methods, neutral method has little effect, but can remove the color of Si- ALMB, and the effect of acid treatment is limited, and the effect of alkaline method is optimal. The best desorption process was 2 g Si-ALMB added to 150 mL concentration of 2 mol·L-1 NaOH solution with temperature 80℃, 1000 rpm stirring speed and 20 rain stirred and heated treatment. After treatment, desorption quantity can reach 112.11 mg·g-1, At this time the rate of desorption is 76.79%.