CAJ | 학술논문

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.
채용간헐법(batch method)모의연구수세화산세고령석재평과산용액중적장기용해효응급기상대용해능력.결과표명,수세화산수고령석반응액중Al、Si리자농도균수평과산농도적증가이승고,차산세고령석중Al、Si리자경역석방;당평과산농도위20 mmol·L-1시,반응936 h후,수세고령석Al、Si적석방량위0.51 mmol·L-1화0.57 mmol·L-1,분별시산세고령석Al、Si석방량적86.44%화83.82%.고령석반응전기표현위Si적우선석방,이재반응후기,고농도평과산(≥20 mmol·L-1)반응액중고령석Al、Si추우동보석방.고령석적용해속솔수평과산농도적증가이제고,차산세고령석적용해속솔대우수세고령석;재본연구농도범위내,용해속솔미표현출대평과산농도적포화성,이현시료수기농도증가적추세.평과산능현저촉진고령석Al화Si적석방,차산세고령석교수세고령석경역용해.
Experiment was conducted to investigate the long-time dissolution effects of water-eluviated and acid-eluviated kaolinite with batch method in malic acid solution. The results showed that malic acid significantly enhanced Al and Si release from kaolinite, and release of Al and Si from kaolinite increased with the increase of concentration of malic acid. Acid-eluviated kaolinite was more easily dissolved than that of water-eluviated kaoli-nite. When the concentration of malic acid was 20 mmol·L-1, after reaction for 936 hours, the release amount of Al and Si from water-eluviated kaolinite was 0.51 mmol·L-1 and 0.57 mmol·L-1, which were 86.44%and 83.82%of the release amount of Al and Si from acid-eluviated kaolinite. The preferential Si-release of kaolinite was ob-served initially, but at reaction anaphase, when the concentration of malic acid were less than 20 mmol/L, Al and Si showed stoichiometric release. Dissolution rate of kaolinite increased with the increase of concentration of malic acids, and dissolution rate of acid-eluviated kaolinite was higher than that of water-eluviated kaolinite;the dissolution rate didn’t show the character of saturation, and the dissolution rate indiated the increasing character of linearity;malic acid significantly enhanced Al and Si release from kaolinite, and the acid-eluviated kaolinite was more easily dissolved than water-eluviated kaolinite in the malic acids reactive solution.