常压石灰法处理烧结法赤泥脱碱及其机理研究

Abstract

Abstract: Dealkalization of sintering process red mud was made by lime（CaO） as de-alkali agent.Reaction temperature，reaction time，addition dosage of de-alkali agent，and liquid-solid ratio on the alkali removal effects，such as dissolution rates of potassium and sodium in the red mud were studied and dealkalization mechanism of lime process was analyzed.Results showed that the rise of temperature，the elongation of reaction time，the augment of lime dosage，and the increase of liquid-solid ratio were all able to improve the dealkalization effect of red mud，especially，the reaction time and lime dosage.Dealkalization mechanism of sintering process red mud by adding CaO was that two Na⁺ were replaced by one Ca²⁺ in the part of sodalite（Na₈Al₆Si₆O₂₄CO₃）to produce a more insoluble calcium nepheline［Na₆CaAl₆Si₆（CO₃）O₂₄·2H₂O］.

Key words: lime process, red mud, dealkalization

CLC Number:

X705

YANG Jiu-Jun, LI Jian-Wei, XIAO Yu-Ling, LUO Zhong-Tao, HAN Yu-Fang. Research on dealkalization of sintering process red mud by lime process at normal atmosphere and mechanism thereof[J]. INORGANICCHEMICALSINDUSTRY, 2012, 44(6): 40-.

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Inorganic Acid-Base-Salt Committee of CIESC

Research on dealkalization of sintering process red mud by lime process at normal atmosphere and mechanism thereof

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