Abstract
High purity phosphatic chemicals should be produced for the development of phosphorus chemical industry. The effects of pairwise combination of scrubbing, calcination and flotation techniques on chemical composition content of different size fractions of a siliceous-calcareous phosphate ore are investigated. The grades of the different size fractions processed by flotation first and then by calcination are higher than those processed by scrubbing first and then by calcination. The grades of the coarse fractions are all higher than 30%, and it can be up to 35.43% for the 98~200 μm fraction. Moreover, the A.I. contents of the all fractions decrease obviously. Especially, it decreases from 11.12% to 5.14% for the fine < 74 μm fraction, which is lower than that processed by scrubbing first and then by calcination about 5%. The SEM images indicate that the effects of scrubbing and calcination on surface characteristics of ore samples are different.
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