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The effect of leaching temperature on kaolinite and meta-kaolin dissolution and zeolite re-precipitation
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-07-15 , DOI: 10.1016/j.mineng.2021.107071
Hong Peng 1 , Tiangui Qi 2 , John Vogrin 1 , Qianmei Huang 1 , Weixi Wu 1 , James Vaughan 1
Affiliation  

The effect of temperature on leaching-precipitation kinetics of both meta-kaolin and kaolinite was investigated. The dissolution of kaolin is the overall rate limiting step and only sodalite appeared as the final zeolite product for all tested temperatures within the reaction time. However, for meta-kaolin, an amorphous zeolite precursor, zeolite LTA and sodalite appeared as zeolite products at different temperatures within the specified time. In addition, the precipitation and dissolution rate of amorphous zeolite precursors appear to be the rate limiting step for meta-kaolin feed. For early stage dissolution of meta-kaolin, identification of XRD-amorphous phases between meta-kaolin and amorphous zeolite precursor was confirmed by SEM-EDS elemental analysis.



中文翻译:

浸出温度对高岭石和偏高岭土溶解及沸石再沉淀的影响

研究了温度对偏高岭土和高岭石浸出-沉淀动力学的影响。高岭土的溶解是整个限速步骤,在反应时间内所有测试温度下,只有方钠石作为最终沸石产品出现。然而,对于偏高岭土,无定形沸石前体、沸石 LTA 和方钠石在指定时间内在不同温度下作为沸石产物出现。此外,无定形沸石前体的沉淀和溶解速率似乎是偏高岭土进料的限速步骤。对于偏高岭土的早期溶解,通过 SEM-EDS 元素分析证实了偏高岭土和无定形沸石前驱体之间的 XRD 非晶相的鉴定。

更新日期:2021-07-15
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