中浸渣铁的浸出过程动力学
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摘要
研究中浸渣铁在热酸浸出中的浸出过程动力学,考察了搅拌转速、反应温度、初始H_2SO_4浓度、矿物粒度和Fe~(3+)离子浓度对铁浸出速率的影响。结果表明:该浸出反应的动力学方程符合收缩核模型。依据反应温度、矿物粒度等多个影响因素研究发现中浸渣热酸浸出过程受化学反应控制。浸出反应的表观活化能为45.657×10~3J/mol,浸出剂硫酸与Fe~(3+)离子浓度对反应的表观反应级数分别为1.09446和-0.07317。中浸渣热酸浸出的宏观动力学方程为:1-(1-α)~(1/3)=0.4442[H~+]~(1.09)[Fe~(3+)]~(-0.07)d_0~(-1)exp(-45657/RT)t。
The leaching process kinetics of iron in neutral leached residue in hot acid leaching is researched to investigate the rotating speed,reaction temperature,the initial concentration of H_2SO_4,the particle size of mineral,as well as the effect of Fe~(3+) ionic concentration on iron leaching rate. The results show: the kinetic equation of this leaching reaction is conforming to the contracting core model. The hot acid leaching process of neutral leached residue is controlled by chemical reaction according to the reaction temperature,mineral particle size and the other influencing factors. The apparent activation energy of leaching reaction is 45. 657 × 10~3 J/mol,The apparent reaction order of the reaction between the leaching agent sulfuric acid and Fe~(3+) ionic concentration separately is 1. 09446 and -0. 07317. The macrokinetics equation of hot acid leaching of neutral leached residue is: 1-( 1-α)~(1/3)= 0. 4442 [H~+]~(1. 09)[Fe~(3+)]~(-0. 07) d_0~(-1) exp(-45657/RT) t.
The leaching process kinetics of iron in neutral leached residue in hot acid leaching is researched to investigate the rotating speed,reaction temperature,the initial concentration of H_2SO_4,the particle size of mineral,as well as the effect of Fe~(3+) ionic concentration on iron leaching rate. The results show: the kinetic equation of this leaching reaction is conforming to the contracting core model. The hot acid leaching process of neutral leached residue is controlled by chemical reaction according to the reaction temperature,mineral particle size and the other influencing factors. The apparent activation energy of leaching reaction is 45. 657 × 10~3 J/mol,The apparent reaction order of the reaction between the leaching agent sulfuric acid and Fe~(3+) ionic concentration separately is 1. 09446 and -0. 07317. The macrokinetics equation of hot acid leaching of neutral leached residue is: 1-( 1-α)~(1/3)= 0. 4442 [H~+]~(1. 09)[Fe~(3+)]~(-0. 07) d_0~(-1) exp(-45657/RT) t.
引文
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[3]Graydon J W,Kirk D W.The mechanism of ferrite formation from iron sulfides during zinc roasting[J].Metallurgical Transaction B,1988,19(5):777-785.
[4]解立群,施哲,胡汉,等.铁酸锌还原焙烧试验研究[J].矿冶,2011(3):76-78.
[5]朱北平,邓志敢,张帆,等.热酸浸出富铟锌浸渣提取锌铟的研究[J].矿冶,2016,25(3):45-49.
[6]Elgersma F,Kamst GF,Witkamp G.J,et al.Acidic dissolution of zinc ferrite[J].Hydrometallurgy,1992,29(1):173-189.
[7]戴兴征,杨美彦,曾鹏,等.高铁锌精矿焙砂强化浸出过程中铁的行为走向研究[J].矿冶工程,2012,32(2):96-99.
[8]夏志华,唐谟堂,李仕庆,等.锌焙砂中浸渣高温高酸浸出动力学研究[J].矿冶工程,2005,25(2):53-57.
[9]李仕庆.高铁铟锌精矿无铁渣湿法炼锌提铟及铁源高值化利用工艺与原理研究[D].长沙:中南大学,2006.
[10]刁微之,和晓才,杨大锦,等.从中浸渣中氧压酸浸锌、铁的试验研究[J].湿法冶金,2013,32(2):89-92.
[11]巨佳,王吉坤,张向阳,等.锌焙砂中浸渣氧压酸浸新工艺探讨[J].有色金属,2011,63(2):159-162.
[12]张纯,闵小波,张建强,等.锌冶炼中浸渣锌还原浸出机制与动力学[J].中国有色金属学报,2016,26(1):197-203.
[13]华一新.冶金过程动力学[M].北京:冶金工业出版社,2004.
[14]姜艳,孙丽达,李自静,等.高炉烟尘中锌的浸出动力学研究[J].无机盐工业,2015,47(1):53-55.
[15]莫鼎成.冶金动力学[M].长沙:中南工业大学出版社,1987.