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采用间歇法(batch method)模拟研究水洗和酸洗高岭石在苹果酸溶液中的长期溶解效应及其相对溶解能力。结果表明,水洗和酸水高岭石反应液中Al、Si离子浓度均随苹果酸浓度的增加而升高,且酸洗高岭石中Al、Si离子更易释放;当苹果酸浓度为20 mmol·L-1时,反应936 h后,水洗高岭石Al、Si的释放量为0.51 mmol·L-1和0.57 mmol·L-1,分别是酸洗高岭石Al、Si释放量的86.44%和83.82%。高岭石反应前期表现为Si的优先释放,而在反应后期,高浓度苹果酸(≥20 mmol·L-1)反应液中高岭石Al、Si趋于同步释放。高岭石的溶解速率随苹果酸浓度的增加而提高,且酸洗高岭石的溶解速率大于水洗高岭石;在本研究浓度范围内,溶解速率未表现出对苹果酸浓度的饱和性,而显示了随其浓度增加的趋势。苹果酸能显著促进高岭石Al和Si的释放,且酸洗高岭石较水洗高岭石更易溶解。
A batch method was used to simulate the long-term dissolution and relative solubilization of washed and pickled kaolinite in malate. The results showed that the concentrations of Al and Si in the washed and sour kaolinite reaction solution increased with the increase of malic acid concentration, and the content of Al and Si ions in pickled kaolinite was more easily released. When the concentration of malic acid was 20 mmol · L-1, the release of kaolinite Al and Si was 0.51 mmol·L-1 and 0.57 mmol·L-1 respectively after 936 h of reaction, which were respectively 86.44 % And 83.82%. In the early stage of reaction, kaolinite Al and Si tended to release simultaneously in the reaction solution of high concentration of malic acid (≥20 mmol·L-1). The dissolution rate of kaolinite increased with the increase of malic acid concentration, and the dissolution rate of pickled kaolinite was higher than that of washed kaolinite. In the concentration range of this study, the dissolution rate did not show the saturation of malic acid concentration, It shows a tendency to increase with its concentration. Malic acid can significantly promote the release of kaolinite Al and Si, and pickled kaolinite Kaolinite washed more easily dissolved.