2017-10-25 · (silicasand) Reverse flotation Type and concentration of collec-tors, type of acid, pH, conditioning time, solid-in-pulp concentration, par-ticlesizeandtemperature upto90 [10] 1.5 (silicasand) HFandHCl Concentrations of the leaching agents, time, leaching temperature, and with/withoutH 2O 2 98.5 [11] 0.29% (silicasand) Biological ba-sintreatment