二氧化硅杂质对重晶石碳热还原反应的影响及其相变行为分析

doi:10.11896/cldb.201906005

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Abstract Silica is the main impurity in barite. Taking the barite mine from Zhenning, Guizhou province as the research object, the occurrence state of SiO₂ in barite and its impact on barite carbothermal reduction were studied. XRD phase analysis and HSC thermodynamic analysis were carried out to study the phase transformation behavior of SiO₂. The results showed that SiO₂ in barite was mainly associated with barium sulfate in the form of independent mineral quartz, and a small amount of SiO₂ existed in barium sulfate inclusions and cryptocrystalline. SiO₂ in the form of independent minerals played a dominant role in affecting the carbothermal reduction of barite. In the carbothermal reduction process of barite, SiO₂ impurities were dispersed in the system and experienced crystal transition from quartz phase to squamous quartz phase and cristobalite phase, which blocked heat transfer and mass transfer of the system and resulted in a 100 ℃ rise of the optimized carbothermal reaction temperature. Meanwhile, the high activity of SiO₂ in the process of crystal reconstruction made it easy to react with barium salt to form BaSiO₃ and Ba₂SiO₄, which caused the decrease of barium sulfide conversion and the increase of acid-soluble barium conversion.

Key words： barite silicon impurity occurrence state carbothermal reduction phase transformation

Published: 03 April 2019

CLC number:

TQ132.3

Fund:This work was financially supported by Guizhou Science and Technology Support Plan Project ([2017]2892,[2017]2023).

About author:: Yu Zhang received her M.S. degrees in June 2003 from Guizhou University in Material Science. Jianxin Cao is currently a professor and doctoral supervisor in Guizhou University.

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	ZHANG Yu
	NIE Dengpan
	CAO Jianxin

Cite this article:

ZHANG Yu,NIE Dengpan,CAO Jianxin. Impact of Silica Impurities in Barite Ore on the Efficiency of Barite Carbothermal Reduction and Its Phase Transition Behavior[J]. Materials Reports, 2019, 33(6): 936-940.

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http://www.mater-rep.com/EN/10.11896/cldb.201906005 OR http://www.mater-rep.com/EN/Y2019/V33/I6/936

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