Pressure acid leaching of high silicon zinc oxide ore

According to the mineral analysis of high silicon zinc oxide ore from Guangxi province, most of zinc exists in matters of zinc silicate and calamine.The ore was treated by oxygen pressure acid leaching.The best technology conditions are obtained by condition experiments, which are particle size 0.104 mm, sulfuric acid 120 g/L, oxygen pressure 1.0 MPa, leaching time 90 min, reacting temperature 120 ℃ and liquid solid ratio of 3:1.It can be concluded that under the best technology conditions, the leaching rate of zinc is 97% and the rate of SiO2 in solid form is above 99.2%, the slurry filtration rate is over 880 L/(m2-h) and the leaching slurry is in good filtration property.