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

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

The School of Earth Science and Resources, Chang’an University, Xi’an 710064, China
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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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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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