过硫酸钠氧化浸出石煤中的钒及其动力学研究
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摘要
为了探讨石煤氧化浸出机理,在常压下采用硫酸溶液直接浸出石煤钒矿,通过在酸浸过程中加入氧化剂过硫酸钠,考察了各工艺条件对V浸出率的影响。结果表明:在过硫酸钠用量2%、硫酸用量35%、固液比1∶1、浸出温度95℃、浸出时间11 h的实验条件下,V浸出率达到88.9%。对不同反应温度下V浸出率-时间曲线进行拟合,拟合结果表明该氧化浸出过程符合收缩未反应芯模型,浸出过程受颗粒表面化学反应控制。根据Arrhenius公式,使用曲线拟合法,近似求得该反应表观活化能为66.08 kJ·mol~(-1)。
In order to explore the mechanism of oxidation leaching of stone coal,the vanadium was leached directly from stone coal vanadium ore by sulfuric acid solution at atmospheric pressure.By adding sodium persulfate in the process of acid leaching,the effects of various conditions on vanadium leaching rate were investigated.The results show that V leaching rate reached 88.9% under the experimental conditions of sodium persulfate 2%,sulfuric acid 35%,solid-liquid ratio 1∶1,leaching temperature 95 ℃ and leaching time 11 h.Fitting the V leaching rate-time curves at different reaction temperatures shows that the oxidation leaching process conforms to the shrinking core model and the leaching process is controlled by the chemical reaction on the particle surface.According to Arrhenius equation,the apparent activation energy of the reaction was approximately calculated to be 66.08 kJ·mol~(-1) by using curve fitting method.
In order to explore the mechanism of oxidation leaching of stone coal,the vanadium was leached directly from stone coal vanadium ore by sulfuric acid solution at atmospheric pressure.By adding sodium persulfate in the process of acid leaching,the effects of various conditions on vanadium leaching rate were investigated.The results show that V leaching rate reached 88.9% under the experimental conditions of sodium persulfate 2%,sulfuric acid 35%,solid-liquid ratio 1∶1,leaching temperature 95 ℃ and leaching time 11 h.Fitting the V leaching rate-time curves at different reaction temperatures shows that the oxidation leaching process conforms to the shrinking core model and the leaching process is controlled by the chemical reaction on the particle surface.According to Arrhenius equation,the apparent activation energy of the reaction was approximately calculated to be 66.08 kJ·mol~(-1) by using curve fitting method.
引文
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[2] CHEN Q G.The research progress in extracting technologies of vanadium from stone coal vanadium ore[J].Multipurpose Utilization of Mineral Resources,2009,2:30-33.
[3] 杨大锦,廖元双,刘瑜.石煤钒矿提钒新工艺研究[J].云南冶金,2014,43(1):41-44.
[4] 景槐,牛磊.湖南怀化会同地区含钒石煤提钒与资源综合利用[J].有色金属工程,2012(4):30-34.
[5] 曾英元,华骏,颜文斌.碱法浸出石煤中的钒和硅[J].吉首大学学报(自然科学版),2015,36(6):59-62.
[6] ZHANG Y M,BAO S X,LIU T,et al.The technology of extracting vanadium from stone coal in China:History,currentstatus and future prospects[J].Hydrometallurgy,2011,109(1):116-124.
[7] 陈明辉,胡详昭,孙际茂,等.湖南省寒武系黑色岩系页岩型钒矿概论[J].地质找矿论丛,2012,27(4):410-419.
[8] 陈放,张一敏,黄晶,等.二氧化锰对石煤提钒直接酸浸的影响[J].化工进展,2017,36(3):1 126-1 133.
[9] 杨晓,张一敏,刘涛,等.含氟助浸剂对石煤提钒酸浸动力学的影响[J].化学工程,2013,41(5):59-63.
[10] 华骏,颜文斌,高峰,等.湘西石煤湿法提钒中复合添加剂的研究[J].矿冶工程,2016,36(1):72-75.
[11] 李莹,颜文斌,华骏,等.软锰矿氧化石煤钒矿的湿法浸出研究[J].应用化工,2013,42(7):1 170-1 173.
[12] 梁泰然,谭立新.复合型助浸剂对钒浸出率的影响[J].材料研究与应用,2016,10(4):255-257.
[13] 马荣骏.湿法冶金原理[M].北京:冶金工业出版社,2007.
[14] 李旻廷.含钒黑色页岩加压酸浸过程动力学及机理研究[D].昆明:昆明理工大学,2012.
[15] 宋天佑,程鹏,王杏乔,等.无机化学[M].北京:高等教育出版社,2004:402-405.
[16] 周宇照,冯雅丽,李浩然,等.石煤与软锰矿焙烧样耦合提取钒锰的动力学[J].中国锰业,2014,32(1):20-25.
[17] 李浩然,冯雅丽,罗小兵,等.湿法浸出粘土矿中钒的动力学[J].中南大学学报(自然科学版),2008,39(6):1 181-1 184.
[18] 张国范,闫继武,刘琨,等.石煤脱硅渣中钒的浸出动力学[J].有色金属(冶炼部分),2012(6):1-3.