Investigations on the extraction of molybdenum and vanadium from ammonia leaching residue of spent catalyst
Investigations on the extraction of molybdenum and vanadium from ammonia leaching residue of spent catalyst
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DOI：
10.1016/j.minpro.2005.11.009
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发表时间：
2006-04-01
影响因子：
--
通讯作者：
Lu, YP
中科院分区：
文献类型：
--
作者：
Chen, Y;Feng, QM;Lu, YP
对氨浸渣(主要化学成分：Mo 2.05%、V 0.42%、Al_2O_3 65.6%、SiO_2 10.7%)采用纯碱焙烧，焙烧产物湿法处理的方法进行了钼、钒的提取研究。焙烧过程中，当碳酸钠与废催化剂的摩尔比为0.15，焙烧温度为750℃，焙烧时间为45min，焙烧产物用水(液固比为2)浸取15min，钼的浸出率可达91.3%以上，钒的浸出率可达90.1%以上。浸出液经净化后，用体积分数为20%的三烷基胺(N(235)，中国商业化)和10体积%的仲辛醇(相改进剂)溶解在磺化煤油中，提取浸出液中的钼和钒。反萃剂为10wt.%氨水。在反萃液中加入30g/L硝酸铵，调节pH值为7~8.5，可使99%以上的钒结晶为偏钒酸铵。当pH在1.5~2.5之间(用HNO(3)调节pH)时，98%以上的钼可结晶为多钼酸铵。偏钒酸铵和多钼酸铵在500-550℃焙烧，得到的MoO(3)和V(2)O(5)的纯度分别为99.08%和98.06%。在整个过程中，钼的得率为88.2%，钒的得率为87.1%。所提出的焙烧、浸出、分离工艺为处理废催化剂氨浸渣提供了一种可行的方案，可用于低品位钼矿石的综合利用。(C)2005 Elsevier B.V.保留所有权利。
Extraction of molybdenum and vanadium from ammonia leaching residue (main chemical composition: 2.05% Mo, 0.42% V, 65.6% Al(2)O(3) and 10.7% SiO(2)) of spent catalyst was investigated by roasting the residue with soda carbonate, followed by hydrometallurgical treatment of the roasted products. In the roasting process, over 91.3% of molybdenum and 90.1% of vanadium could be extracted when a charge containing a sodium carbonate to spent catalyst ratio of 0.15 was roasted at 750 degrees C for 45 min and the roasted mass was leached with water (liquid to solid ratio of 2) at 80-90 degrees C for 15 min. After the purification of leach liquor, an extraction solvent consisting of 20 vol.% trialkylamine (N(235), commercialized in China) and 10 vol.% secondary octyl alcohol (phase modifier) dissolved in sulfonated kerosene was used to extract molybdenum and vanadium in leach liquor. 10 wt.% ammonia water was used as stripping agent. Adding 30 g/l NH(4)NO(3) to the stripping solution and adjusting the pH to 7-8.5, over 99% of vanadium can be crystallized as ammonium metavanadate. Over 98% of molybdenum can be crystallized as ammonium polymolybdate when pH is between 1.5 and 2.5 (pH is adjusted by HNO(3)). Ammonium metavanadate and ammonium polymolybdate were calcinated at 500-550 degrees C, the purity Of MoO(3) and V(2)O(5) was 99.08% and 98.06% respectively. In the whole process, 88.2% of molybdenum and 87.1% of vanadium could be achieved. The proposed roasting, leaching and separation steps give a feasible alternative for the processing of ammonia leaching residue of spent catalyst and can be applied in the comprehensive utilization of low grade molybdenum ores. (c) 2005 Elsevier B.V. All rights reserved.