Valency Study of Vanadium in Stone Coal of Southern China
来源期刊：Rare Metals1990年第2期
论文作者：Xu Guozhen;Ge Nai’e;Chen Jianping;Shen Shaobo Chinese University of Geosciences,Beijing
文章页码：110 - 116
摘 要：<正> Vanadium-bearing stone coal is a new resource of vanadium. V in stone coal mainly exists in three oxidation states: 7.84%V（Ⅲ）, 72.08% Ⅴ（Ⅳ） and 20.08% Ⅴ（Ⅴ）. The change and distribution of valency of Ⅴ during oxidizing roasting shows that organicmatter in the coal determines valency of Ⅴ at low temperature; at about 450℃, Ⅴ（Ⅲ） is completely oxidized to Ⅴ（Ⅳ）; above500℃, temperature is the most important factor for the oxidation of Ⅴ. At 700～1000℃, 92% of Ⅴ in the coal has been oxidizedto Ⅴ（Ⅴ）, at still higher temperature no more oxidation of Ⅴ takes place, an equilibrium being established. The roles of NaCl in therecovery of V2O5 from the coal were discussed. The best conditions for roasting are: the oxidation-chlorination atmosphere,temperature 800℃ for 30 minutes, ore: NaCl=100:10,ηroast reaching 90%.
Xu Guozhen;Ge Nai’e;Chen Jianping;Shen Shaobo Chinese University of Geosciences,Beijing 100083
摘 要：<正> Vanadium-bearing stone coal is a new resource of vanadium. V in stone coal mainly exists in three oxidation states: 7.84%V（Ⅲ）, 72.08% Ⅴ（Ⅳ） and 20.08% Ⅴ（Ⅴ）. The change and distribution of valency of Ⅴ during oxidizing roasting shows that organicmatter in the coal determines valency of Ⅴ at low temperature; at about 450℃, Ⅴ（Ⅲ） is completely oxidized to Ⅴ（Ⅳ）; above500℃, temperature is the most important factor for the oxidation of Ⅴ. At 700～1000℃, 92% of Ⅴ in the coal has been oxidizedto Ⅴ（Ⅴ）, at still higher temperature no more oxidation of Ⅴ takes place, an equilibrium being established. The roles of NaCl in therecovery of V2O5 from the coal were discussed. The best conditions for roasting are: the oxidation-chlorination atmosphere,temperature 800℃ for 30 minutes, ore: NaCl=100:10,ηroast reaching 90%.
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