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含钒石煤是我国一种新型钒矿资源,从石煤中提取精钒(V_2O_5>98％)的生产关键是钠盐氧化焙烧,本文着重于石煤中钒的价态研究,探讨钒的氧化和转化规律。崇阳石煤中钒分配率:V(Ⅲ)占98.77％V(Ⅳ)占1.23％。阐述了焙烧过程中钒的氧化状态,经历了还原区、氧化还原区,氧化区和平衡区等不同分布状况。在提钒过程中氯化钠起加速钒的氧化和生成可溶钒的双重作用。在此基础上结合矿物晶体结构的分析,确定了钠化焙烧的转化条件:775℃,焙烧15min,矿:盐=100∶10;η焙达81.2％。
The vanadium-containing stone coal is a new type of vanadium ore resource in our country. The key to the production of refined vanadium (V 2 O 5> 98%) from stone coal is sodium salt roasting. This article focuses on the valence state of vanadium in stone coal, Oxidation and transformation rules. Vanadium in Chongyang coal distribution rate: V (Ⅲ) accounted for 98.77% V (Ⅳ) accounted for 1.23%. The oxidation state of vanadium during roasting process is expatiated, which has undergone different distributions such as reduction zone, redox zone, oxidation zone and balance zone. During the vanadium extraction process, sodium chloride plays a dual role in accelerating the oxidation of vanadium and forming soluble vanadium. Based on the analysis of the crystalline structure of the mineral, the conversion conditions of sodium calcination were determined: 775 ℃, calcination 15min, ore: salt = 100:10; η baking 81.2%.