关键词: 黏土矿物, 脱泥, 磷灰石, 磁铁矿, 烧绿石, 综合回收

Abstract: The ore is a clay type weathered iron-niobium polymetallic ore in which the mineral composition is complex and the distribution relationship is close. The existence of fine clay affects the recovery of valuable elements Fe,P,Nb seriously. The process of desliming,apatite flotation,magnetic separation and pyrochlore gravity separation was adopted in the test. First of all,desliming was used to reduce the influence of fine mud on mineral separation. Then,the locked cycle test of apatite flotation was carried out for the materials after desliming,iron concentrate was obtained by magnetic separation from apatite flotation tailings. Finally,the pyrochlore was recovered from iron tailings by means of metallurgy. For the raw ore assaying P2O5 of 8. 56% and Fe of 31. 16%,the phosphorus concentrate assaying P2O5 of 30. 78%,Fe of 9. 27% with phosphorus recovery of 45. 95% was obtained;The phosphorus concentrate assaying P2O5 of 39. 79% with recovery of 2. 75% was obtained in the stage of pyrochlore recovery operation,the total recovery of phosphorus was 48. 70%. The iron concentrate assaying Fe of 60. 73%, P 2O5 of 1. 00% with recovery of 45. 35% was obtained;The content of Nb2O5 in niobium slag was 19. 64% with recovery of 20. 98% for raw ore. Compared with the theoretical recovery rate of phosphorus of 49. 37% and iron of 55. 45% in raw ore, phosphorus and iron was effectively recovered.

Key words: clay minerals,desliming,apatite,magnetite,pyroclore,comprehensive utilization