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KMID : 0861020030180020027
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Korea Journal of Herbology
2003 Volume.18 No. 2 p.27 ~ p.35
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The Processing Effects of Pyrite after Heating and Quenching in Vinegar
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Abstract
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Objectives : To verify the processing effects of traditional operation include heating and quenching in vinegar, we studied phase changes and variation in concentration of poisionous metals caused by different conditions during processing of pyrite.
Method : Pyrite was processed at temperatures up to 850℃ and through as many as 5 processing cycles. And toxic metal extraction test in water was carried out from the processed pyrites on the assumption that pyrite medicines with the lowest toxic metal content would be most desirable.
Results : Increasing temperature and quenching in vinegar promoted phase change of pyrite to hematite, reduction of toxic metals in pyrite and their concentrations in the extraction solutions. The relationship between variations in extracted elements and the number of processing cycles at the same processing temperature were not clear.
Conclusions : Traditional processing operations is very effective to reduce the toxicity of pyrite medicine, and it should be processed at the highest possible temperature, at least higher than 650℃, in order to diminish highly toxic metals such as As, Pb. Co and Ni.
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