High-efficiency extraction of Al from coal-series kaolinite and its kinetics by calcination and pressure acid leaching

被引：48
|
作者：
Lin, Min [1 ]
Liu, Yuan-Yuan [1 ]
Lei, Shao-Min [1 ]
Ye, Zhao [1 ]
Pei, Zhen-Yu [1 ]
Li, Bo [2 ]
机构：
[1] Wuhan Univ Technol, Sch Resource & Environm Engn, Wuhan 430070, Hubei, Peoples R China
[2] Yichang Huilong Sci & Technol Co Ltd, Yichang 443004, Peoples R China
来源：
APPLIED CLAY SCIENCE | 2018年 / 161卷
关键词：
Al extraction; Coal-series kaolin; Calcination; Pressure acid leaching; Leaching kinetics; FLY-ASH; POZZOLANIC ACTIVITY; MECHANOCHEMICAL TREATMENT; CALCINED CLAYS; SILICA; DISSOLUTION; MECHANISM; GANGUE; MICROSTRUCTURE; CERAMICS;
D O I：
10.1016/j.clay.2018.04.031
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
High-efficiency extraction of Al from coal-series kaolinite and its kinetics by calcination and pressure acid leaching has been studied in detail. Calcination process promoted a phase transform from crystal kaolinite to amorphous compounds. Subsequently, Al occurred in the compounds was efficiently extracted by pressure acid leaching. At optimal conditions, the extraction rate of Al reaches 98.7%. Pressure leaching process of Al was successfully described by Avrami model, and mainly controlled by chemical reaction when apparent activation energy was 16.29 kJ/mol. The complex extraction process of Al in heated acid leaching (diffusion-reaction diffusion) was transformed into a simple chemical reaction during pressure leaching so as to realize a high efficiency extraction of Al from coal-series kaolinite.
引用
收藏
页码：215 / 224
页数：10
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