Phosphoric Acid → Zinc Phosphate

Participants

Reaction Steps

Zinc-containing wastes resulting from the production of sodium hydrosulphite in the amount of 1,019 g containing 960 g of zinc oxide and 10 g of metallic zinc are ground in a ball mill by the wet grinding method in the presence of 1,000 g of water, whereafter an additional 2,000 g of water are added thereto along with 143 g of potassium permanganate. Under continuous stirring, the slurry is heated to a temperature of 80° C. and 965 g of phosphoric acid as calculated for 100% H3PO4 are added thereto. The slurry is subjected to filtration after 35 minutes of the heating, the residue is washed and dried to give 2 kg of zinc phosphate (the yield is equal to 97%).

Provenance & Evidence