Abstract
Abstract There is a competitive reaction of zinc and silica in the alkali leaching process of zinc oxide ore, leading to low zinc leaching rate. To increase leaching rate of zinc, the effect of sodium silicate on the solubility of zinc oxide of the Na 2 O–ZnO–SiO 2 –H 2 O equilibrium system is studied by adding Na 2 SiO 3 and ZnO to NaOH solution. Results show that zinc oxide equilibrium concentration increases with temperature from 25 to 75 °C at the same molar ratio of Na 2 O to SiO 2 . The equilibrium concentration of zinc oxide initially increases and then declines with the increasing concentration of Na 2 O. This leads to the maximum ZnO concentration, which increases with temperature but decreases with the increasing dosage of sodium silicate. The precipitate of disodium zinc silicate (Na 2 (ZnSiO 4 )) generates due to the reaction of silicate SiO 3 2 − and Zn(OH) 4 2 − in the solution of Na 2 O–ZnO–H 2 O equilibrium system. High zinc leaching rate can be obtained when the Na 2 O concentration is lower than the values indicated by the “peak” points at higher molar ratios of Na 2 O to SiO 2 and temperatures.
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