Na_2CO_3促进某硅质页岩中低价钒的钠化氧化作用研究
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摘要
在对含钒硅质页岩添加NaCl进行氧化焙烧提钒过程中引入Na_2CO_3可促进钒的氧化和后续浸出。在对促进效果进行考察的基础上,通过对复合添加剂焙烧产物及浸出渣的化学成分、XRD及SEM-EDS等的分析,研究了Na_2CO_3的促进机理。结果表明:①在NaCl+Na_2CO_3(质量比为3∶2)与试验原料质量比为10%,焙烧温度800℃,焙烧时间180 min,焙烧产物在液固比10 mL/g、浸出温度80℃、浸出时间120 min条件下搅拌浸出(600 r/min),钒浸出率达到84.96%。②焙烧过程中,原料中的白云母、伊利石等矿物铝氧八面体晶格被破坏,转变为主要含元素Na、K、Al、Si、O的熔融颗粒并析出钠长石。Na_2CO_3增加焙烧原料碱度,使石英反应活性增强并与熔融颗粒共熔产生多孔颗粒。③加入NaCl和Na_2CO_3后,熔融颗粒及石英共熔产生的微孔结构及焙烧过程中充填于熔融颗粒间的长石形成的气相通道,均使焙烧料内部O2的扩散性增强,与低价钒接触几率增加,加速钒氧化进程,使钒氧化焙烧效果变好。
The addition of Na_2CO_3 in the process of sodium roasting of vanadium-bearing siliceous shale can promote the oxidation and leaching of vanadium. The promotion effect of Na_2CO_3 was investigated based on promotion effect by chemical composition analysis,XRD and SEM-EDS of roasting products and leaching residue from oxidation roasting with composite additive. The results showed that:① When the mass ratio of NaCl+Na_2CO_3(3∶2 of mass ratio)to the raw material was 10%,the roasting temperature was 800 ℃,the roasting time was 180 min,the liquid-solid ratio was 10 mL/g,the leaching temperature was 80 ℃ and the leaching time was 120 min(stirring speed is 600 r/min),the optimal leaching rate of vanadium was84.96%.② During roasting,because of the destruction of Al-O octahedral lattice,the muscovite and illite in the raw materials were transformed into the melt particles containing Na,K,Al,Si and O. The addition of Na_2CO_3 increases the basicity of raw materials,enhances the reactivity of quartz and produces porous particles by co-melting with molten particles. ③With the addition of Na_2CO_3,the micropore structure produced by co-melting of melt particles and quartz and the gas channel formed by feldspar filling in the melt particles during roasting,enhanced the diffusivity of O2,increased the contact probability with lowvalent vanadium in ore,and accelerated the process of vanadium oxidation,and increased the oxidation roasted effect of vanadium.
The addition of Na_2CO_3 in the process of sodium roasting of vanadium-bearing siliceous shale can promote the oxidation and leaching of vanadium. The promotion effect of Na_2CO_3 was investigated based on promotion effect by chemical composition analysis,XRD and SEM-EDS of roasting products and leaching residue from oxidation roasting with composite additive. The results showed that:① When the mass ratio of NaCl+Na_2CO_3(3∶2 of mass ratio)to the raw material was 10%,the roasting temperature was 800 ℃,the roasting time was 180 min,the liquid-solid ratio was 10 mL/g,the leaching temperature was 80 ℃ and the leaching time was 120 min(stirring speed is 600 r/min),the optimal leaching rate of vanadium was84.96%.② During roasting,because of the destruction of Al-O octahedral lattice,the muscovite and illite in the raw materials were transformed into the melt particles containing Na,K,Al,Si and O. The addition of Na_2CO_3 increases the basicity of raw materials,enhances the reactivity of quartz and produces porous particles by co-melting with molten particles. ③With the addition of Na_2CO_3,the micropore structure produced by co-melting of melt particles and quartz and the gas channel formed by feldspar filling in the melt particles during roasting,enhanced the diffusivity of O2,increased the contact probability with lowvalent vanadium in ore,and accelerated the process of vanadium oxidation,and increased the oxidation roasted effect of vanadium.
引文
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[2]Ning Pengge,Lin Xiao,Wang Xiangyan,et al.High-efficient extraction of vanadium and its application in the utilization of the chromi-um-bearing vanadium slag[J].Chemical Engineering Journal,2016,301:132-138.
[3]陈铁军,邱冠周,朱德庆.石煤提钒焙烧过程钒的价态变化及氧化动力学[J].矿冶工程,2008(3):64-67.Chen Tiejun,Qiu Guanzhou,Zhu Deqing.Valence variation and oxidation kinetics of vanadium during vanadium-bearing stone coal roasting[J].Mining and Metallurgical Engineering,2008(3):64-67.
[4]He Dongsheng,Feng Qiming,Zhang Guofan,et al.An environmentally-friendly technology of vanadium extraction from stone coa[lJ].Minerals Engineering,2007(12):1184-1186.
[5]Zhang Yimin,Bao Shenxu,Liu Tao,et al.The technology of extracting vanadium from stone coal in China:History,current status and future prospects[J].Hydrometallurgy,2011(1/2):116-124.
[6]Chen Tiejun,Zhang Yimin,Song Shaoxian.Improved extraction of vanadium from a Chinese vanadium-bearing stone coal using a modified roast-leach process[J].Asia-Pacific Journal of Chemical Engineering,2010(5):778-784.
[7]Shlewit H,Alibrahim M.Extraction of sulfur and vanadium from petroleum coke by means of salt-roasting treatment[J].Fuel,2006(5/6):878-880.
[8]Sadykhov G B.Oxidation of titanium-vanadium slags with the participation of Na2O and its effect on the behavior of vanadium[J].Russian Metallurgy,2008,6:449-458.
[9]Li Xinsheng,Xie Bing,Wang Guangen,et al.Oxidation process of low-grade vanadium slag in presence of Na2CO[3J].Transactions of Nonferrous Metals Society of China,2011(8):1860-1867.
[10]Zhao Yunliang,Zhang Yimin,Song Shaoxian,et al.Behaviors of impurity elements Ca and Fe in vanadium-bearing stone coal during roasting and its control measure[J].International Journal of Mineral Processing,2016,148:100-104.
[11]Cai Zhenlei,Zhang Yimin,Liu Tao,et al.Mechanisms of vanadium recovery from stone coal by novel BaCO3/CaO composite additive roasting and acid leaching technology[J].Minerals,2016(2):26.
[12]付利攀,张一敏,刘涛,等.酸碱性添加剂对硅质硅质含钒页岩焙烧效果的影响[J].金属矿山,2012(1):111-114.Fu Lipan,Zhang Yimin,Liu Tao,et al.Study on the effect of acidand alkaline additives on the roasting for siliceous containing vanadium shale[J].Metal Mine,2012(1):111-114.
[13]Xiao Wending.Mineralogy of stone coal from Shanglin of Guangxi and vanadium extraction with hydrometallurgical process[J].Nonferrous Metals,2007,59:85-90.
[14]张岱,李旻廷.石煤中钒元素在燃烧前后赋存状态变化的研究[J].云南地质,2014(3):401-408Zhang Dai,Li Minting.A study on the variation of V element existence in stone coal before-after combustion[J].Yunnan Geology,2014(3):401-408.
[15]Mirazimi S M J,Abbasalipour Z,Rashchi F.Vanadium removal from LD converter slag using bacteria and fung[iJ].Journal of Environmental Management,2015,153:144-151.
[16]Nazari E,Rashchi F,Saba M,et al.Simultaneous recovery of vanadium and nickel from power plant fly-ash:Optimization of parameters using response surface methodology[J].Waste Management,2014(12):2687-2696.
[17]雷辉,陈建梅,胡盛强,等.复合添加剂对石煤提钒焙烧与浸出工艺研究[J].无机盐工业,2012(1):33-36.Lei Hui,Chen Jianmei,Hu Shengqiang,et al.Study on effect of composite additive on roasting and leaching processes for vanadium extraction from stone coal[J].Inorganic Chemicals Industry,2012(1):33-36.
[18]李刚,朱媛媛,易凌云,等.低品位钾盐助剂焙烧与水浸及结晶制备钾盐[J].过程工程学报,2016(4):684-691.Li Gang,Zhu Yuanyuan,Yi Lingyun,et al.Preparation of potassium salt from low grade potassium ore with additive-assisted roasting,water leaching and crystallization[J].The Chinese Journal of Process Engineering,2016(4):684-691.
[19]徐锦明,马鸿文,郭庆丰,等.霞石正长岩中温烧结反应过程研究[J].吉林大学学报:地球科学版,2010(6):1295-1330.Xu Jinming,Ma Hongwen,Guo Qingfeng,et al.Sintering reaction process in the system of the nepheline syenite:an experimental study[J].Journal of Jilin University:Earth Science Edition,2010(6):1295-1330.