Method for leaching molybdenum and rhenium from molybdenum concentrate by mineral slurry electrolysis method

A technology of pulp electrolysis and molybdenum concentrate, which is applied in the field of leaching molybdenum and rhenium, can solve the problems of rhenium dispersion, difficult recovery, low recovery rate, etc., and achieve the effect of high leaching rate, mild reaction conditions and simple process

Inactive Publication Date: 2009-01-28
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a simple process, no pollution, high molybdenum and rhenium leaching rate, which can effectively A method for leaching molybdenum and rhenium from molybdenum concentrate by using slurry electrolysis to improve the utilization rate of molybdenum resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Will contain Mo 52.06%, Re18.69×10 -6 , Cu 0.3% and Pb 0.15% molybdenum concentrate 5g is placed in the electrolytic cell, add water to keep the mass ratio of liquid and solid at 15:1, add 200g.L -1 Sodium chloride is used as the electrolyte, and a mechanical stirring device is used to stir and adjust the pulp to keep the pulp in a suspended state. Add an appropriate amount of dextrin 1mL with a mass percentage concentration of 0.1% in the electrolytic tank to avoid the phenomenon of foaming of the pulp. Then add sodium carbonate to control the PH of the pulp to 9.5. After the slurry is adjusted, the titanium plate coated with ruthenium, iridium and titanium is used as the anode, and the pure titanium plate is used as the cathode. The direct current is connected to electrolyze the pulp, and the electrolysis is performed while stirring. The pole spacing is 8mm and the cell voltage is 4.7V. , electrolysis current 3A, anode current density 1200A / M 2 , Electrolysis time 4....

Embodiment 2

[0018] Will contain Mo47.23%, Re 32.05×10 -5 , Cu1.5%, Pb2.15% molybdenum concentrate 5g is placed in the electrolytic cell, add water to keep the liquid and solid mass ratio at 20:1, add 250g.L -1 Sodium chloride is used as the electrolyte, and a mechanical stirring device is used to stir and adjust the pulp to keep the pulp in a suspended state. Add an appropriate amount of dextrin 1mL with a mass percentage concentration of 0.1% in the electrolytic tank to avoid the phenomenon of foaming of the pulp. Then add sodium carbonate to control the PH of the pulp to 9.0. After the slurry is adjusted, the titanium plate coated with ruthenium, iridium and titanium is used as the anode, and the pure titanium plate is used as the cathode. The direct current is connected to the pulp for electrolysis, and the electrolysis is performed while stirring. The pole spacing is 9mm and the cell voltage is 5.5. V, electrolysis current 3.5A, anode current density 1400A / M 2 , Electrolysis time 5.0...

Embodiment 3

[0020] Will contain Mo 52.06%, Re 18.69×10 -6 , Cu 0.3%, Pb 0.15% molybdenum concentrate 5g is placed in the electrolytic cell, add water to keep the mass ratio of liquid and solid at 10:1, add 50g.L -1 Sodium chloride is used as the electrolyte, and a mechanical stirring device is used to stir and adjust the pulp to keep the pulp in a suspended state. Add an appropriate amount of dextrin 1mL with a mass percentage concentration of 0.1% in the electrolytic tank to avoid the phenomenon of foaming of the pulp. Then add sodium carbonate to control the PH of the pulp to 8.5. After the slurry is adjusted, the titanium plate coated with ruthenium, iridium and titanium is used as the anode, and the pure titanium plate is used as the cathode. The direct current is connected to electrolyze the pulp, and the electrolysis is carried out while stirring. The pole spacing is 8.5mm and the cell voltage 3.7V, electrolysis current 2.5A, anode current density 2500A / M 2 , Electrolysis time 8h. ...

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Abstract

The invention discloses a slurry electrolysis method applied to leach molybdenum and rhenium from molybdenum ore concentrate. The method comprises the following steps: molybdenum ore concentrate containing rhenium is put into an electrolysis bath, wherein, water is added in the electrolysis bath to keep the mass rate of liquid to solid in the range of 10-20: 1, and a mechanical stirring device is used for stirring the slurry obtained so as to cause the slurry to be in suspension status; sodium chloride is added into the electrolysis bath as an electrolyte, appropriate quantity of dextrin with the mass percentage concentration of 0.1 percent is added and sodium carbonate is added to control pH value of the slurry in electrolysis process at 8 to 10; after slurry mixing, a titanium plate of ruthenium-iridium-titanium coating is used as an anode, a pure titanium plate is used as a cathode, direct current is provided to carry out slurry electrolysis, simultaneously stirring is carried out, and the molybdenum and the rhenium are leached from the molybdenum ore concentrate after electrolysis. The method has the advantages of moderate reaction conditions, simple technology, high leaching rate of the molybdenum and the rhenium, and no pollution, wherein, the leaching rate of the molybdenum is not less than 99 percent, the leaching rate of the rhenium is not less than 95 percent, and the electrolysis current efficiency is not less than 92 percent, thereby being capable of effectively recycling the rhenium from the molybdenum ore concentrate and improving the utilization rate of molybdenum resource.

Description

technical field [0001] The invention relates to a method for extracting and separating valuable metals, in particular to a method for leaching molybdenum and rhenium from molybdenum concentrates by means of pulp electrolysis. Background technique [0002] At present, the method of processing rhenium-containing molybdenum concentrate is to oxidize and roast the molybdenum concentrate in a multi-hearth furnace, a rotary kiln or a reverberatory furnace. The molybdenum disulfide in the molybdenum concentrate is oxidized to molybdenum trioxide, and the Rhenium in molybdenum ore is oxidized to rhenium dioxide (ReO 2 ) or rhenium heptoxide (ReO 7 ) and other rhenium oxides. During oxidative roasting, rhenium in molybdenite may enter molybdenum due to the occurrence state, such as the different degree of close relationship between the content and the existence of molybdenite, the different particle size composition of molybdenum concentrate, and the type of ore deposit. In the fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C22B3/04C22B34/34C22B61/00
CPCY02P10/20
Inventor 吴贤李来平张健
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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