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Minerals 2017, 7(10), 196; https://doi.org/10.3390/min7100196

Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism

1,2
,
2,3
,
2,3
,
1
and
2,3,*
1
The School of Earth Science and Resources, Chang’an University, Xi’an 710064, China
2
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
3
Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 9 October 2017 / Accepted: 11 October 2017 / Published: 17 October 2017
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Abstract

Sericite is a typical silicate impurity in microcrystalline graphite ores, and its removal is important in the preparation of high-purity graphite preparations. Alkali-acid leaching is an effective method used to purify graphite and remove silicate minerals. In this study, the dissolution behavior and mechanism of sericite in alkali-acid leaching were investigated. The dissolution of sericite was mainly affected by alkali leaching temperature, sodium hydroxide concentration, and alkali leaching time. According to the XRD, FTIR, and SEM-EDS analyses, the dissolution mechanism of sericite is a three-stage process: (1) sericite is dissolved in the form of soluble silicate and aluminate; (2) the dissolved silicate and aluminate then react with each other to form aluminosilicate; and (3) finally the aluminosilicate mainly composed of hydroxycancrinite and sodalite is almost completely dissolved in the hydrochloric acid solution. View Full-Text
Keywords: sericite; alkali leaching; acid leaching; aluminosilicate; sodalite; hydroxycancrinite sericite; alkali leaching; acid leaching; aluminosilicate; sodalite; hydroxycancrinite
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Wang, H.; Feng, Q.; Tang, X.; Zuo, K.; Liu, K. Insights into Alkali-Acid Leaching of Sericite: Dissolution Behavior and Mechanism. Minerals 2017, 7, 196.

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