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Hydrometallurgical method for separating and extracting Mn, Fe, Pb and Ag from silver-manganese ore

A technology of hydrometallurgy and silver-manganese ore, which is applied in the hydrometallurgy field of Fe, separation and extraction of Mn, Pb and Ag, can solve the problems of low recovery rate, complicated environmental management, high energy consumption, etc., and achieve low cost and environmental governance easy effect

Inactive Publication Date: 2013-12-25
GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problems of large investment, long flow process and low comprehensive recovery rate in the prior art. The present invention provides a wet method for separating and extracting Mn, Fe, Pb and Ag from silver-manganese ore. The metallurgical method overcomes the shortcomings of pyrometallurgy silver-manganese concentrate, such as large investment, long process flow, silver dispersion, low recovery rate, high energy consumption, and complicated environmental management, and overcomes the leaching of sulfuric acid and sulfate, and the inability to separate Mn and Fe , poor comprehensive recovery and other shortcomings; the present invention has the advantages of low cost, high efficiency and simple environmental management, and is a method for full hydrometallurgy of silver-manganese concentrate

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  • Hydrometallurgical method for separating and extracting Mn, Fe, Pb and Ag from silver-manganese ore

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Experimental program
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Effect test

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 in 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℃, 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 82% Fe and 2.4% Mn, 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%, after aluminum plate replaces Pb, liquid Containing Pb0.45g / L, the replacement rate i...

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Abstract

The invention discloses a hydrometallurgical method for separating and extracting Mn, Fe, Pb and Ag from silver-manganese ore. The method comprises the following steps: leaching silver-manganese concentrate by hydrochloric acid, adjusting the pH value by NH4HCO3 to obtain an ammonium chloride leachate, and leaching residues obtained after the ammonium chloride leaching by a hydrochloric acid solution of calcium chloride to obtain a calcium chloride leachate; electrolyzing the ammonium chloride leachate to prepare iron powder; carrying out a crystallization process of a residual liquid to prepare MnCl2.4H2O, and carrying out thermal decomposition to prepare manganese chloride; and replacing Ag from the calcium chloride leachate by metallic lead to obtain Ag, and replacing by metallic iron or aluminum to obtain Pb. Compared with pyrometallurgy, the method disclosed in the invention has the advantages of saved investment, high recovery rate and substantial economic benefit.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a hydrometallurgical method for separating and extracting Mn, Fe, Pb and Ag from silver-manganese ore. Background technique [0002] Silver-manganese ore is an important deposit in gold-silver deposits, often containing Mn, Fe, Pb, Ag, S, after beneficiation and roasting, the mass fractions of Mn and Fe are generally more than 20%, and the content of Pb is about 1-4%. The content of Ag is more than 100g / t, and the content of Au is less. It is the main raw material for industrial Ag extraction. [0003] The traditional method of extracting silver-manganese ore is to smelt manganese-rich slag in a blast furnace, and obtain ferrosilicon and crude lead at the same time. The content of Ag in manganese-rich slag and ferrosilicon is relatively small, and it mainly remains in crude lead, and then enters the anode slime through electrolysis of lead. Recycle. The traditional pyrometallurgy...

Claims

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Application Information

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IPC IPC(8): C22B3/10C25C1/06C22B3/22C22B3/46C22B11/00C22B13/00C01G45/06
CPCY02P10/20
Inventor 李世平余坦韦国龙王志斌
Owner GUIZHOU HONGDA ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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