METHOD OF EXTRACTING METALS FROM POLYMETALLIC RAW MATERIAL WITH REGENERATION OF BASIC (NH) AND ACIDIC (HCl) REACTANTS Russian patent published in 2018 - IPC C01C1/02 C01C1/16 C01B7/05 

FIELD: chemistry.

SUBSTANCE: to implement the method, the extraction of metals from the polymetallic raw materials is carried out by leaching with hydrochloric acid solution, the deposition of metals from hydrochloric acid solutions is carried out by ammonia, and salt NH₄Cl_sol is crystallized from the solution. The separate production of gaseous basic (NH₃) and acidic (HCl) reactants is carried out by the reaction of salts (NH₄)₂SO₄ and NH₄Cl according to the scheme: Step 1 - (NH₄)₂SO_4sol.=NH₄HSO_4liq.+NH_3gas (1); Stage 2 - NH₄HSO_4liq.+NH₄Cl_sol.=(NH₄₎₂SO_4sol.+HCl_gas (2). The process is carried out cyclically with regeneration of salt (NH₄)₂SO₄ by reaction 2 and NH₄Cl - in process cycles using the said gaseous reactants.

EFFECT: method provides an efficient and economical technology with a high degree of metal recovery with simultaneous regeneration of the reactants used.

2 dwg, 2 ex