抄録
A low grade pottery stone abundant in quartz and iron sulfide impurities was purified by using The test plant equipped with a decanter type centrifuge and a liquid extractor. Centrifugal classification was performed two times at different accelerations in respective stage. The extractor combined with a slurry pump for dispersing oil drops in The aqueous slurry and an oil-water separation cell was used for extraction of fine sulfides particles from The slurry by kerosene. The solid in the product stream of the centrifugal process was enriched with clay fraction having a particle size of 98% less than 5μm and the Fe_2O_3 content in The clay product mainly composed of sericite was 0.77wt%, even though The mass recovery was 11% by weight. By The additional oil-extraction process, the residual Feo_2O_3 in The clay prodect was decreased to 0.38wt% with Fe rejection of 94%. The achievement of such a high degree of purification is attributed to The characterisitic texture of The eaw ore composed of fine clay mineral particles and ligid quartz with coarse grain size resulting in the easy liberation to free particles and also to The appropriate preparation of raw slerry avoiding the overgrinding of pyrite.
