苹果酸对酸沉降下高岭石的溶解作用

摘要

Experiments was conducted to investigate the long-time dissolution effect of acid-eluviated kaolinite with batch method in malic acids solution. The results showed that malic acids enhanced significantly Al and Si release from kaolinite, compared with deionised water, and Al and Si releasing from kaolinite increased with concentration increase of malic acids. The preferential Si-release of kaolinite was observed initially in the malic acids solution. The rate of kaolinite dissolution obtained in malic acid solution was lower than that in the citric acids, and the dissolution rate behaved the increasing character of linearity with the concentration of malic acids. The dissolution rate could not behave the character of saturation with the concentration of malic acids in the research concentration of malic acids.%采用间歇法(batch method)模拟研究酸沉降下的高岭石在苹果酸溶液中的长期溶解效应.结果表明:苹果酸能明显促进高岭石Al和Si的释放,且Al、Si的释放能力随苹果酸浓度的增加而增强；苹果酸作用下,高岭石表现为Si的优先释放.苹果酸对高岭石的溶解速率低于柠檬酸,且其溶解速率表现出对苹果酸浓度的线性增长,在本研究浓度范围内,并来出现速率饱和浓度.