Traditional germanium recovery process for zinc hydrometallurgy

When the valence of (1)Ge increases, the valence of O decreases, and the reaction produces water. The ion reaction is Ge2++H2O2+2H+=Ge4++2H2O.

So the answer is: Ge2++H2O2+2h+= Ge4++2h2o;

(2) Because GeCl _ 4 can be hydrolyzed in aqueous solution, adding concentrated hydrochloric acid can inhibit the hydrolysis of GeCl _ 4, and the distillation experiment also needs thermometer and condenser tube.

So the answer is: inhibit the hydrolysis of GeCl4; Thermometer; Condensing tube;

(3)GeCl4 is hydrolyzed to produce GeO2? NH2O can also produce HCl, and the hydrolysis reaction is GeCl4+(2+n)H2O=GeO2? NH2O+4HC 1, as shown in figure 1. Because the hydrolysis reaction is exothermic, the best reaction temperature can be controlled by using iced brine.

So, the answer is: GeCl4+(2+n)H2O=GeO2? nH2O+4hc 1； Hydrolysis is an exothermic reaction; c；

(4) The greater the 4)pH value, the greater the dissolution rate, so GeO2 can react with alkali, which is similar to alumina, and there are two kinds. When the pH is greater than 8, the dissolution rate of GeO2 increases, and GeO2+2OH-=GeO32-+H2O appears.

So, the answer is: Germanium dioxide is amphoteric; GeO2+2OH-=GeO32-+H2O。