Reduction leaching method for separating manganese and silver in manganese silver concentrate

A manganese-silver concentrate and leaching technology, which is applied in the field of manganese sulfate preparation for electrolysis, can solve problems such as easy overflow of sulfur dioxide, difficulty in obtaining gas, and deterioration of production conditions, and achieve low cost of purification and removal of impurities, low temperature required for reaction, and low reaction temperature. Process controllable effect

Inactive Publication Date: 2014-11-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of using sulfur dioxide as a reducing agent are good reducibility and high leaching rate, but the disadvantages are that the gas is not easy to obtain, transportation is more difficult, and sulfur dioxide is easy to overflow, which will deteriorate production conditions and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A manganese-silver concentrate in China contains 10.3% manganese, 243g / t silver, and the mineral particle size is 200±50 mesh.

[0020] Prepare sodium pyrosulfite aqueous solution; take 10 kilograms of this manganese-silver ore powder, add concentrated sulfuric acid and water, after stirring to form a slurry, add the prepared sodium pyrosulfite solution into the pulp and stir, the amount of sodium pyrosulfite added is 100 kg / t, The added amount of concentrated sulfuric acid is 60kg / t, the liquid-solid ratio is 2:1, the volume ratio of water for preparing sodium metabisulfite solution to the water added to manganese-silver ore powder is 1:1, and the pH value of the pulp is kept at 3.5 to 4. at 35oC for 2 hours; after the reduction reaction is completed, filter and separate solid and liquid to obtain manganese-containing solution and silver-containing slime respectively.

[0021] Utilize equipment ICP (inductively coupled plasma spectrometer) to detect manganese-containin...

Embodiment 2

[0023] Manganese oxide ore is identical with embodiment 1. A manganese-silver concentrate in China contains 10.3% manganese, 243g / t silver, and the mineral particle size is 200±50 mesh.

[0024] Prepare sodium pyrosulfite aqueous solution; take 10 kg of manganese-silver ore powder, add concentrated sulfuric acid and water, stir evenly to form a pulp, then add sodium pyrosulfite solution into the pulp and stir, the amount of sodium pyrosulfite added is 200kg / t, and the amount of concentrated sulfuric acid 105kg / t, the liquid-solid ratio is 3.5:1, the volume ratio of the water for preparing the sodium metabisulfite solution to the water added to the manganese-silver ore powder is 1:2.5, and the pH value of the slurry is kept at 3 to 3.5, the leaching temperature is 15oC, and the time 3.5 hours; after the reduction reaction is completed, filter and separate solid and liquid to obtain manganese-containing solution and silver-containing slime respectively.

[0025] Using the equip...

Embodiment 3

[0027] A manganese-silver concentrate in China contains 20.54% manganese, 354g / t silver, and the mineral particle size is 200±50 mesh.

[0028] Prepare an aqueous solution of sodium pyrosulfite; take 10 kg of the manganese-silver ore powder, add concentrated sulfuric acid and water, stir evenly to form a pulp, then add the sodium pyrosulfite solution into the pulp and stir. The amount of sodium pyrosulfite added is 300 kg / t, and the amount of concentrated sulfuric acid The liquid-solid ratio is 150kg / t, the liquid-solid ratio is 5:1, the volume ratio of the water for preparing the sodium metabisulfite solution to the water added to the manganese-silver ore powder is 1:4, the pH value of the ore pulp is kept at 2 to 2.5, the leaching temperature is 50oC, and the time 5 hours; after the reduction reaction is completed, filter and separate solid and liquid to obtain manganese-containing solution and silver-containing slime respectively.

[0029] Using the equipment ICP (inductive...

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PUM

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Abstract

The invention discloses a reduction leaching method for separating manganese and silver in a manganese silver concentrate, and belongs to the technical field of preparation of manganese sulfate for electrolysis. The reduction leaching method is mainly achieved through the following steps: (1) dissolving a certain amount of sodium metabisulfite into a certain amount of water; and (2) slowly adding the sodium metabisulfite solution into a manganese silver concentrate pulp, stirring and carrying out a reduction reaction in an acidic medium, after completion of the reduction reaction, filtering, carrying out solid-liquid separation, and thus respectively obtaining a manganese-containing solution and a silver-containing ore mud. The subsequent manganese leached solution is subjected to deep purification and impurity removal to prepare a pure manganese sulfate solution, and the sliver-enriched residue is subjected to silver extraction by an ammoniacal thiosulfate method. The selected reducing agent has strong reducibility, the reaction required temperature is low, the output waste residue amount is small, the reaction time is short, the purification and impurity removal cost of the manganese leached solution is low, requirements on equipment are low, and the reaction process is controllable. The clear, environmental-protection and high-efficiency production process is provided for comprehensive utilization of manganese silver ore resources in China.

Description

technical field [0001] The invention belongs to the technical field of manganese sulfate preparation for electrolysis, and in particular relates to a reduction leaching method for separating manganese and silver in manganese and silver concentrate. Background technique [0002] Manganese silver ore is a potentially important resource for China's precious metal industry. Domestic manganese silver ore raw ore generally has a manganese content of 3% to 5%, and a silver content of tens to several kilograms per ton. The total proven silver reserves are nearly 10,000 tons. Manganese-silver ore is recognized as one of the difficult-to-treat complex paragenetic ores. Most of the raw materials used by domestic enterprises are minerals with high silver content (Ag>400g / t). Due to the same quality, the recovery rate of silver is low, only 10% to 50%. At present, my country's manganese carbonate ore resources are facing exhaustion, and the electrolytic manganese industry will gradual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00C22B3/08
CPCY02P10/20
Inventor 韩庆辛仕伟易新王炜鹏
Owner NORTHEASTERN UNIV
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