用NaCl对含镓钒渣进行氯化焙烧提取镓时气相氧分压的影响
INFLUENCE OF pO2 ON EXTRACTING Ga FROM V-CONTAINING SLAG BY SODA CHLORINATION ROASTING
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摘要: 通过V-Ga-Cl-O系优势区图、气相平衡组成计算和实验室实验研究,对用NaCl与含镓钒渣混合焙烧提取镓时,气相氧分压产生的影响进行了分析讨论。1123K下V-Ga-Cl-O体系的优势区图表明,在焙烧时应控制维持一定的气相氧分压,以使钒渣中FeV2O4氧化并与NaCl作用生成水溶性钒酸钠,同时释放出氯气氯比钒渣中的Ga2O3。在对钒渣用NaCl进行焙烧实验时发现,当气相pO2低于0.005MPa时,Ga2O3的氯化率随pO2的增加而提高;当pO2超过0.005MPa时,Ga2O3的氯比率则随pO2的增加而减少。实验中Ga2O3的氯化率最高为31%左右。Abstract: Gallium is a rare scattered metal of important uses.The V-containing slag produced by Panzhihua Steel Co.contains Ga203.In this paper,the influence of the pO2 on extracting Ga from the V-containing slag is discussed based on thermodynamic analysis and experimental results.The predominance diagram of the V-Ga-Cl-O system at 850℃ indicates that,during roasting,a relatively high O2 partial pressure should be maintained to oxidize FeV2O4 which then reacts with NaCl and liberates Cl2 to chloridize Ga2O3 in the slag.It was found from the roasting experiment that the chlorination ratio of Ga2O3 increases with pO2 when pO2 is lower than 0.005 MPa but decreases with pO2 when pO2 is higher than 0.005MPa.The maximum chlorination ratio of Ga2O3 during roasting was about 31%.
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Key words:
- V-containing slag /
- Gallium /
- chlorination roasting /
- O2 partial pressure predominance diagram /
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