Abstract:

Apatite ore is the main source of raw materials for fertilizer production. Annually, the Bac Nhac Son apatite ore beneficiation plant (Lao Cai) produces about 300 thousand tons of concentrate and disposed of about 600-700 thousand tons of tailing ore to the tailing pond. With many years of production, the amount of tailing ore accumulated up to tens of millions of tons with a grade content of about 5 - 10% P2O5. For rational utilization of mineral resources as well as protecting the environment, this article has conducted a study on the recovery of apatite in the tailing pond of the Bac Nhac Son apatite ore beneficiation plant. The research result shows the high efficiency of the tailing process by using the combination of the process of preliminary flotation, re-grinding and closed circuit flotation with two stages of cleaners. The concentrate has a yield of 13.36%, an actual recovery of 37.60% and a grade content of 30.52% P2O5. This type of concentrate product was mixed and met the requirements of fertilizer production with the raw materials.