Decomposition method for molybdenite by wet process

A technology of molybdenite and full wet method, which is applied in electrolysis process, electrolysis components, etc., can solve the problems of high production cost, high power consumption, and low current efficiency, and achieve high leaching rate, low energy consumption, and enhanced mass transfer Effect

Inactive Publication Date: 2008-09-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The electro-oxidation method has been mostly used in the treatment of low-grade molybdenum minerals. Its main disadvantages are that the current efficiency is not high and the power consumption is large, which leads to high production costs of this method (Yu Qinghua, Chen Tingzhang. Recovery of molybdenum from molybdenum tailings[J] .Mining and Metallurgy Engineering, 1992, 12(2))

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  • Decomposition method for molybdenite by wet process
  • Decomposition method for molybdenite by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The molybdenite concentrate contains Mo47.40%, the particle size distribution is 10-100 μm, 87% is less than 45 μm, and the volume average particle size is 27.18 μm.

[0022] Add 2 parts of molybdenum concentrate, 0.25 parts of sodium carbonate, 5 parts of NaCl and 20 parts of water into an electrolytic cell without a diaphragm, and the electrolytic anode is a DSA anode (TiO 2 RuO plated on base 2 ), the cathode uses titanium mesh. After stirring and making pulp, energize and electrolytically oxidize at a temperature of 10°C, and control the anode current density to 700A / m during electrolysis 2 , energized and electrolyzed for 360 minutes, and stopped stirring. After washing the electrodes and filtering, the content of Mo in the filtrate was analyzed, and the leaching rate of Mo was 86.5%, the leaching rate of Re was 88.7%, and the electrolytic current efficiency was 72.2%.

[0023] Calculation of electrolysis current efficiency:

[0024]

[0025] Calculation of ...

Embodiment 2

[0028] A diaphragm-free electrolytic cell with an ultrasonic generating device is used (the ultrasonic probe is directly placed in the pulp), and the electrolytic anode is a DSA anode (TiO 2 RuO plated on base 2 ), the cathode adopts low carbon steel cathode (iron cathode).

[0029] 2 parts of molybdenum concentrate (Mo47.40%, the same as Example 1), 0.25 parts of sodium carbonate, 4.5 parts of KCl and 20 parts of water are added to the electrolytic cell, and after electrolytic stirring and slurrying, energized electrolytic oxidation at room temperature, electrolytic Control the anode current density at 750A / m 2 , continuous ultrasonic emission, energized electrolysis for 240 minutes, and stopped stirring. After washing the electrodes and filtering, the Mo content in the filtrate was analyzed, and the leaching rate of Mo was 99.4%, the leaching rate of Re was 100%, and the electrolytic current efficiency was 100.1%.

Embodiment 3

[0031] The test device is the same as in Example 2.

[0032] With 2 parts of molybdenum concentrate (Mo 47.40%, with embodiment 1), 0.25 parts of sodium hydroxide, 2.5 parts of NH 4 Cl and 15 parts of water are added into the electrolytic tank and stirred to make slurry. Control the electrolysis temperature to 45°C and the anode current density to 50A / m 2 , Ultrasonic waves are emitted for 3 minutes every 15 minutes, energized and electrolyzed for 600 minutes, and the stirring is stopped. After washing the electrodes and filtering, the content of Mo in the filtrate was analyzed, and it was found that the leaching rate of Mo was 94.8%, and the electrolytic current efficiency was 96.1%.

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Abstract

The invention discloses a molybdenite whole-wet method decomposition method. The molybdenite, the chloride electrolyte and the water are added into a membraneless electrobath with an ultrasonic generator and are stirred to prepare the ore pulp with the ore pulp mass percentage ranging from 5 to 80 percent and the chloride electrolyte mass percentage ranging from 5 to 50 percent, the mixture is electrolyzed and oxidized under the action of ultrasonic and at a temperature ranging from 0 to 100 DEG C, in the electroanalysis process, the current density of the anode is controlled to be 50 to 1200 A / m<2>, the ultrasonic is emitted continuously or intermittently, the electrolyzed and oxidized molybdenite is converted into the molybdena or molybdate compound. By the ultrasonic field and the electric field coupling action, the method reinforces the wet method decomposition process of the molybdenite, overcomes the retardation of the oxide passive film generated in the oxidization leaching process of the conventional wet method, and improves the current efficiency and the Mo leaching rate of the prior membraneless electrooxidation leaching technique.

Description

technical field [0001] The invention relates to an all-wet decomposition method of molybdenite. Background technique [0002] Molybdenite is widely distributed and the most important molybdenum mineral in industrial applications. At present, my country's molybdenum concentrate production capacity has reached nearly 70,000 tons per year, accounting for about 7% of the world's total. Although the molybdenum deep processing capacity has a certain scale, there are more than 70 scientific research and production plants for molybdenum products, molybdenum alloys, and molybdenum chemicals. , but most of the extraction metallurgy of molybdenum adopts the traditional roasting-ammonia leaching process, which has the disadvantages of serious pollution of the environment by sulfur-containing flue gas, low recovery rate of Mo and associated Re, and poor product quality. [0003] The full wet decomposition process of molybdenite was successfully developed in the late 1960s. Compared with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C25B1/00
Inventor 符剑刚钟宏
Owner CENT SOUTH UNIV
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