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Thesis Advisor夏光祥
Degree Grantor中国科学院研究生院
Abstract本文着重研究了在90 ~ 110 ℃、500 ~ 1500 kPa、400 ~ 1000min~(-1)、0 ~ 0.267M HNO_3、0.16 ~ 0.51M H~+及0 ~ 0.05g/l木质素磺酸钠的条件下,砷黄铁矿在HNO_3-H_2 SO_4-O_2水溶液体系中催化氧化酸浸的动力学规律,考察了反应过程中产物的分布及表面活性剂木磺酸钠、搅拌转速、氧分压、硝酸浓度、初始酸度、温度、粒度和Fe~(3+)、Cu~(2+)等因素对氧化浸取速率的影响。研究表明体系的主要产物为Fe~(3+)、As(III)、As(V)和S~o。硝酸浓度、初始酸度和粒度是控制体系反应速率的最重要的因素。元素S~o的形成并不影响氧化反应的继续进行。实验结果可用收缩未反应芯模型来表达,即1-(1-α)~(1/3) = kt。测得的体系表观活化能值为23.6kJ/mol。初步推断砷黄铁矿的表面氧化反应为体系速率控制步骤。
Other AbstractThe kinetics of the catalytic oxidation acid leaching of arsenopyrite was studied in the temperature range of 90 ℃ to 110 ℃ and the oxygen pressure range of 500 to 1500kPa in the HNO_3-H_2 SO_4 -O_2 aqueous system. The stirring speed, nitric acid concentration, acid concentration and lignosufonate concentration were varied between 400 to 1000 min~(-1), 0 to 0.267M, 0.16 to 0.51 M and 0 to 0.05g/l respectively. In addition to the effect of reaction time on the extraction of arsenopyrite and on the distribution of products, the effects of stirring spped, nitric acid concentration, oxygen pressure, acid concentration, temperature, average radius of particles, the addition of Fe~(3+) or Cu~(2+), as well as the presence of lignosufonate on the reaction rate have also been investigated. The experiment showed that the principal reaction products were Fe~(3+), As (III), As(V) and S~o. The elemental sulphur produced does not interfere with the progress of the reaction process. The oxidation rate is greatly dependent on nitric acid concentration, average radius of samples and acid concentration. It was found that a shrinking core model with chemical reaction controlling, expressed as 1-(1-α)~(1-3) = kt, could be adopted to describe the kinetics results. The apparent activation energy was tested to be 23.6 kJ/mol. It was suggested that the oxidation reaction on the surface of arsenopyrite should be the rate determining step.
Document Type学位论文
Recommended Citation
GB/T 7714
魏晓娜. 砷黄铁矿在催化氧化酸浸体系中反应的初步研究[D]. 中国科学院研究生院,1991.
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砷黄铁矿在催化氧化酸浸体系中反应的初步研(2343KB) 限制开放CC BY-NC-SAApplication Full Text
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