عنوان مقاله [English]
The particle size distribution plays an important role in the flotation due to the impact on the particle-bubble collision, attachment, and detachment. In the flotation process, fine particles have low collision performance to the bubbles and coarse particles have low attachment performance to the bubbles. Therefore, in the flotation, most of the valuable minerals losing are observed in ultrafine and coarse particles. In order to increase the recovery of coarse particles, a proper amount of chemical reagents must be distributed in the circuit; hence the distribution regimen of chemical reagents in the circuit is very important. In this research, in the zinc flotation circuit of the Bama lead and zinc company, the reagent distribution regimen has been modified in order to improve the recovery of zinc in the coarse particles. Therefore, different reagent distribution regimens were compared using a design experiment (Taguchi L9) in the laboratory scale. The results showed that using 30 g/t of the AERO3477 as collector in the rougher stage, along with 15 g/t of the potassium emyl xanthate (PEX) as collector and 7 g/t MIBC as frother in the scavenger stage, the recovery of fine and coarse particles were increased about 3.2 and 5.4 %, respectively. Also, using this reagent distribution regimen at the Gushfil plant of the Bama company was increased the recovery of fine and coarse particles as 2.5 and 3.9 %, respectively, and the zince grade of the final concentrate was increased about 1.4 %, and finally the plant profits was increased about 500000 USD, yearly.
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