Removal of hematite from Bitlis-Hurmuz kyanite for producing concentrates suitable for the refractory industry

摘要

The aim of this study is the removal of hematite from Bitlis-Hurmuz kyanite to produce kyanite concentrates of suitable specification for use in the refractory industry. For this purpose, two groups of flotation experiments were carried out. In the first group of experiments, flotation of hematite was performed at pH values between 2 and 9. The effect of the type and the amount of the collector was investigated during the flotation of hematite at pH values of 4 and 7. In the second group of experiments, kyanite flotation was performed in the presence of petroleum sulphonate + alkyl succinamate and oleic acid at a pH of 4. This resulted in a concentrate containing >55 percent Al_2O_3 with a recovery of > 65 percent. The Fe_2O_3 content of the kyanite sample was reduced from an initial value of 2.3 percent to a final value of 0.9 percent.