پر عيارسازي كانسنگ فسفات موندون به روش هاي ليچينگ، كلسيناسيون و مغناطيسي

Beneficiation Studies of Moundon Carbonaceous Phosphate Ore by Leaching, Calcination and Magnetic Separation Methods

In this paper, beneficiation studies of Moundon phosphate ore were investigated for reduction of its gangue minerals such as carbonates and iron minerals. According to the mineralogical studies, phosphate mineral content of the ore (collophane) was sedimentary mineral and the predominant constituents of the gangues were calcite and quartz. Experimental designs were performed using Taguchi method for leaching and calcination experiments. To remove the carbonate gangue and to increase the P2Os content, leaching experiments were performed using acetic acid. The effect of different parameters such as leaching time, acetic acid amount and solid/liquid ratio were investigated. In the optimum conditions the residue of the leaching experiment contained 31.19% P20; with 99.9% recovery. Calcinations method was employed to decrease the carbonate gangue and increase the P2Os content. Results showed that under the optimum conditions the calcine contained 25.25% P2Os and the recovery was 99.8%. Also the wet high intensity magnetic separation method was used to reduce the amount of Fe2Oi in the ore. Under the optimum conditions, the amount of Fe203 was decreased from 2.58 to 1.43%.