在高溫、高压下酸性溶液中,用空气氧化黄铁矿时生成硫酸及三氧化二鉄。文献上认为反应的机理系先生成硫酸亚鉄,然后氧化为硫酸高铁,硫酸高铁再水解生成三氧化二铁。最近进行的动力学研究表明,反应生成的α-Fe_2O_3,应由黄铁矿直接氧化而来。本工作采用Fe~(55,59)为示踪剂进行反应机理的研究,証明最近研究的結果是正确的,文献上报导的机理与实际情况不符合。
Under high pressure and temperature pyrite is oxidized into sulfuric acid and ferric oxide in the acid solution. According to the reaction mechanism reported in the literature, the pyrite is first converted into ferrous sulfate and then is oxidized into ferric sulfate in the solution. On further reaction the ferric salt is hydrolyzed into hydroxide and then changed into ferric oxide. Kinetic studies carried out recently in our Institute indicate that the reaction product α-Fe_2O_3 is the direct oxidation product of pyrite and a new reaction mechanism was proposed. Radioactive Fe~(55,59) was used in this study as tracer to study the reaction mechanism. Results are in agreement with the mechanism proposed recently and indicate that the one reported in the literature is incorrect.
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