| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: invention relates to a method for treatment of low-grade oxidized zinc ores and concentrates with zinc, manganese, iron, lead, silver, calcium and silicon dioxide recovery. The method comprises crushing, fine crushing, lixiviating, settling-down of the above components from solutions, wherein the lixiviating shall be performed in stages: during the first and the second stage - lixiviation by sulphuric acid solution over the reducing substance, the oxidation-reduction potential å (ORP): at the first stage å=380-420 mV, at the second stage å=420-460 mV. At the third stage lixiviation is performed by an ammonium carbonate solution with the composition (g/dm3): 60-110 NH3 general 30-65 C02 general while at the fourth stage it is performed by nitric acid NHO3. At the fifth stage sulphating roasting with H2SO4 term with further water leaching is performed, the sixth stage being lixiviation with ammonium fluoride aqueous solution of acid NH4HF2. The obtained soutions shall be puriied and used for zinc, manganese, iron, lead, silver, calcium, silicon dioxide and sodium sulfate, ammonium nitrate recovery. EFFECT: enhanced zinc recovery and rational utilization of the stock. ^ 16 cl, 1 dwg, 3 ex |
