Experimental Study on the Preparation of High Purity Graphite by Alkali-acid Method

LIU Yuhai; LI Haiming

doi:10.13779/j.cnki.issn1001-0076.2018.05.010

2018 Vol. 38, No. 5

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LIU Yuhai, LI Haiming. Experimental Study on the Preparation of High Purity Graphite by Alkali-acid Method[J]. Conservation and Utilization of Mineral Resources, 2018, (5): 73-78. doi: 10.13779/j.cnki.issn1001-0076.2018.05.010

Citation:

LIU Yuhai, LI Haiming. Experimental Study on the Preparation of High Purity Graphite by Alkali-acid Method[J]. Conservation and Utilization of Mineral Resources, 2018, (5): 73-78. doi: 10.13779/j.cnki.issn1001-0076.2018.05.010

Experimental Study on the Preparation of High Purity Graphite by Alkali-acid Method

Bureau of Land and Resources of Luobei County, Luobei 154200 Heilongjiang, China

Received Date: 29 August 2018

Publish Date: 25 October 2018

Abstract

Abstract

Experiments were carried out on a fine flaky graphite flotation concentrate in Heilongjiang Provence by alkali-acid purification method. The optimum technological parameters were investigated. The results showed that under the conditions of NaOH dosage 3.0 g (ratio of alkali to solid 0.6:1), roasting temperature 750℃, roasting time 40 min, leaching water dosage 50 mL, acid leaching HCl concentration 1.0 mol/L, dosage 40 mL and acid leaching time 40 min, the fixed carbon content in graphite was increased from 95.89% to 99.94% by the process of alkali fusion roasting-water leaching-acid leaching. As the reaction proceeds and the phase changes, the impurities are eventually transformed into soluble matters and are washed with pure water. Maintaining a weak alkaline environment during water leaching is beneficial to the dissolution of sodium silicate.
- graphite /
- purification /
- alkali-acid method /
- sodium silicate /
- mechanism

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References

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