含钒钢渣碳酸化浸取提钒动力学研究

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (1): 98.

含钒钢渣碳酸化浸取提钒动力学研究

柯家骏¹, 李道文¹, 李希明¹, 岳良东¹, 冯光熙², 黄祥玉², 何晋秋², 李国良², 葛书华³

1. 中国科学院化工冶金研究所;
2. 成都科技大学化学系;
3. 地质部矿产综合利用研究所

收稿日期:1980-08-20 出版日期:1982-01-25 发布日期:1982-01-25

STUDIES ON THE KINETICS OF CARBONATION LEACHING OF VANADIUM-CONTAINING STEEL SLAG

Ke Jiajun¹, Li Daowen¹, Li Ximing¹, Yue Liangdong¹, Feng Guangxi², Huang Xiangyu², He Jingqiu², Li Guoliang², Ge Suhua³

1. Institute of Chemical Metallurgy, Academia Sinica, Beijing;
2. Department of Chemistry, Chengdu University of Science and Technology;
3. Institute of Comprehensive Utilization of Minerals, Ministry of Geology

Received:1980-08-20 Online:1982-01-25 Published:1982-01-25

摘要/Abstract

摘要： 用高钙含钒钢渣经钠盐焙烧后的焙砂样品以及焦钒酸钙合成样品,在15—75℃范围内进行了碳酸化浸取动力学研究。碳酸化浸取提钒,主要是把钢渣中的碳酸钙溶解,使钒呈钒酸钠形式进入溶液,钙转变成碳酸钙沉淀。研究表明,在碱性溶液中通入CO₂气体,随着pH值的下降,首先生成Na₂CO₃,随后生成NaHCO₃。此碳酸化浸取的液-固反应过程,用颗粒表面溶解反应的收缩核心模型进行描述,在反应初期阶段是Na₂CO₃的溶浸作用,然后则主要是NaHCO₃的溶浸作用,后者的反应速度比前者快。用焦钒酸钙合成样品进行研究,证实了所推论的反应机理。在所试验的温度范围内,碳酸化浸取焦钒酸钙合成样品的反应表观活化能为25.3千焦/摩尔。

Abstract: The kinetics of carbonation leaching of soda-calcined steel slag containing vanadium and rich-calcium as well as a synthetic Ca₂V₂O₇ was studied. The carbonation leaching was done at the temperature range of 15-75℃. The process of carbonation leaching of vanadium from the steel slag is essentially to dissolve calcium vanadate present in the calcined steel slag into the solution in the form of sodium vanadate, and to change calcium into CaCO₃ precipitate. This study has shown that when COpasses through the alkaline leaching solution, Na₂CO₃ is first formed and NaHCO₃ consequently, with the decrease of pH. The process of the solid-liquid reaction may be described by a shrinking core model of dissolution of the particle surface. In the initial reaction period the solution leaching of Na₂CO₃ dominates, but later on that of NaHCO₃ prevailes. The rate of the latter was much faster than that of the former, that is, the rate constant of the leaching reaction k₂>k₁. For the solution leaching of NaHCO₃, the equation of the leaching kinetics was obtained,1-(1-a)^1/3=kτ[C_NaHCO₃]^0.46 in which a is the fraction of dissolution of vanadium, k is the rate constant of reaction, min^-1, τ is the reaction time, min, Cis the concentration of NaHCO₃, mol. On th bases of the results of these epxeriments, the mechanism of carbonation leaching of vanadium-containing steel slag has been discussed. This mechanism has also been verified with synthetic Ca₂V₂O₇ sample and an apparent activation energy 25.9 KJ/mol was obtained over the experimental temperature range.

TrendMD:

柯家骏, 李道文, 李希明, 岳良东, 冯光熙, 黄祥玉, 何晋秋, 李国良, 葛书华. 含钒钢渣碳酸化浸取提钒动力学研究. 高等学校化学学报, 1982, 3(1): 98.

Ke Jiajun, Li Daowen, Li Ximing, Yue Liangdong, Feng Guangxi, Huang Xiangyu, He Jingqiu, Li Guoliang, Ge Suhua. STUDIES ON THE KINETICS OF CARBONATION LEACHING OF VANADIUM-CONTAINING STEEL SLAG. Chem. J. Chinese Universities, 1982, 3(1): 98.