A hydrometallurgical method for separating and extracting mn, fe, pb and ag from silver manganese ore
A hydrometallurgy, silver-manganese ore technology, applied in the field of hydrometallurgy, can solve the problems of complex environmental treatment, low recovery rate, large investment, etc., and achieve the effect of easy environmental treatment and low cost
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Embodiment 1
[0025] Use silver-manganese concentrate containing 190g / t of silver, 0.012g / t of gold, 20.4% of iron, 20% of manganese, and 1.37% of lead under the conditions of HCl concentration of 20% by mass fraction, liquid-solid ratio of 4, and 80°C , leached for 2 hours, and the final pH value was NH 4 HCO 3 Control PH value=5±0.5, use ammonium chloride concentration to reach 150g / L and Cl - NH with a concentration of 150g / L 4 The mixed solution of Cl and HCl, the liquid-solid ratio is 4, under the condition of 80 ℃, the neutral leaching with pH=4~5 (one-time leaching) is carried out, and the leaching liquid contains Mn59~78.4g / L, Fe42~53g / L respectively, Ag7~18mg / L, Pb0.3~0.4g / L. The leaching residue contains Ag190-220g / t and Pb2.3-3%. Mn2.5~4%, Fe3.2~4.5%, primary leaching rate (slag calculation) Mn87.5%, Fe84.3%.
Embodiment 2
[0027] With the primary chlorination leaching residue of embodiment 1 in CaCl 2Under the conditions of 300g / L, HCl mass fraction 10%, 85-90°C, and liquid-solid ratio of 5, the primary leaching of Pb and Ag was carried out for 3 hours, and the leachate contained Ag158mg / L, Pb5.8g / L, and the slag contained Ag28. 5g / t. Pb0.47%, slag-based primary leaching rate Ag85.3%, Pb79.6%.
Embodiment 3
[0029] The ammonium chloride leaching solution that contains Mn, Fe of example 1 output is at current density 200A / m 2 , tank pressure 2.0V, tank temperature 50°C. The anode plate is graphite, and the cathode plate is aluminum plate. Under the conditions of pH 3 and 5, the electrolysis is carried out for 24 hours, and the iron powder containing Fe mass fraction is 82%, Mn2.4%, Mn, The separation rate of Fe reaches 97%, the cathode current efficiency is 81.2%, the solution after electrolysis contains Mn80.5g / L, Fe7g / L, and the evaporation concentration reaches above Mn130g / L to crystallize MnCl containing Mn26.7%, Fe4.2% 2 .4H 2 O (theoretical mass fraction is 32%).
[0030] Containing Ag158mg / L of example 2, the chlorinated leachate of Pb5.48g / L replaces sponge silver powder and aluminum plate replacement sponge lead with lead plate, after Pb replaces Ag, liquid contains Ag7mg / L, replacement rate 95.6%, aluminum plate replaces Pb back liquid Containing Pb0.45g / L, the replace...
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