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REWAS 2019 pp 89-95 | Cite as

Effect of CO Partial Pressure on Extraction of Alumina from Coal Fly Ash During Carbothermal Reduction Process

  • Yang Xue
  • Wenzhou YuEmail author
  • Zhixiong You
  • Xuewei Lv
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Comprehensive utilization of coal fly ash is a promising industry with great environmental protection and resource recycling. Alumina extraction from coal fly ash usually produces a large amount of silicon-containing waste, which would have adverse effects on the environment. In order to reduce the production of silicon-containing slag, a new process of carbothermal reduction is proposed. Owing to the generation of CO in solid phase reaction, it is necessary to study the effect of CO partial pressure on the reaction. By changing argon gas flow rates, the effect of CO partial pressure on carbothermal reduction process is analyzed. Moreover, the experiments in vacuum furnace have been studied. The results show that the mullite phase in coal fly ash can be more easily decomposed with low CO partial pressure at the same reduction temperature. This paper provides a new sight for the industrial application of alumina extraction from coal fly ash.

Keywords

Coal fly ash Carbothermal reduction Alumina Ferrosilicon alloys CO partial pressure 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Yang Xue
    • 1
    • 2
  • Wenzhou Yu
    • 1
    • 2
    Email author
  • Zhixiong You
    • 1
    • 2
  • Xuewei Lv
    • 1
    • 2
  1. 1.College of Materials Science and EngineeringChongqing UniversityChongqingPeople’s Republic of China
  2. 2.Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced MaterialsChongqing UniversityChongqingPeople’s Republic of China

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