中浸渣铁的浸出过程动力学

The Leaching Process Kinetics of Iron in Neutral Leached Residue

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 ro- tating speed, reaction temperature, the initial concentration of H2SO4 , the particle size of mineral, as well as the effect of Fe^3＋ ionic concen- tration 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 Fe3＋ ionic concentration separately is 1. 09446 and -0. 07317. The macrokinet- ics equation of hot acid leaching of neutral leached residue is ： 1 - （ 1 - α ） ,/3 = 0. 4442 [ H ＋ ] ^1.09 [ Fe^3＋]^0.07 d0^-1 exp （ - 45657/ RT） t.