PROCEDURE FOR PROCESSING WASTE CHEMICAL SOURCES OF CURRENT OF MANGANESE-ZINC SYSTEM FOR COMPLEX UTILISATION Russian patent published in 2011 - IPC C22B47/00 C22B7/00 

FIELD: metallurgy.

SUBSTANCE: procedure consists in separation of coal electrode and zinc cylinder, in flushing and dissolving in sulphuric acid. Also, flushing from ammonia chloride and zinc hydroxide is carried out with 0.2 M solution of sulphuric acid (H₂SO₄). Upon flushing residue of manganese oxide (IV) (MnO₂), oxy-hydroxide of manganese (MnOOH) and coal mass (C) is crumbled in ball mills. Crumbled residue is dissolved in sulphuric solutions of concentration 0.05 mole/l containing 0.05-0.1 mole/l of oxalic acid at ratio of concentrations of ions of manganese and oxalic acid 1:5 at pH=1-2.2 and temperature of solution 80°C. Upon dissolving solution is filtered for removal of coal mass. Residues of zinc ions are removed from solution with isoamyl alcohol of 200 ml volume at presence of 2 M solution of ammonia thiocyanate and 0.5 M HCl, and there is performed neutralisation with 0.5 M solution of caustic soda (NaOH). Further, produced solution is evaporated at temperature 100°C to obtaining mass of crystalline compounds of composition sodium trioxalomanganate (IV) Na₄[Mn(C₂O₄ ^2-)₃] and salt of sodium oxalate (Na₂C₂O₄). Produced mass is baked in atmosphere containing oxygen at temperature 400-500°C with production of MnO₂ as a final product.

EFFECT: raised efficiency and ecological safety of procedure.

4 dwg, 3 tbl, 2 ex