The study on the effect of flotation purification on the performance of α-hemihydrate gypsum prepared from phosphogypsum.

As can be seen from Table 3 , the productivity, whiteness, and purity of PG concentrate showed an increasing trend with the increase of grinding time.

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When the amount of dodecylamine reached 150 g/t, the continued increase of dosage led to the PG concentrate rate, whiteness and purity had a decreasing trend, which can be inferred that the increase of collector dosage led to the increase of CaSO 4 ·2H 2 O up-floating in PG, which is easy to entrain more impurities in the up-floating process.

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