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Technique for leaching molybdenum from nickel-molybdenum ores by pulp electrolysis

A technology of slurry electrolysis and nickel-molybdenum ore, which is applied in the field of molybdenum hydrometallurgy, can solve the problems of explosion and small feasibility, and achieve the effects of low energy consumption, simple process and cost saving of chemicals

Active Publication Date: 2014-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wu Xian (CN101353803) discloses a method for leaching molybdenum and rhenium from molybdenum concentrate by pulp electrolysis. The electrolysis method proposed by Wu Xian produces chlorine gas at the anode and hydrogen gas at the cathode. Explosion will occur during the electrolysis process, so the feasibility is very small
However, the slurry electrolysis method has not yet been applied to nickel-molybdenum ore.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Use 1 ton of nickel-molybdenum ore containing Mo5.42%, Ni3.01%, Si11.02%, Ca7.91%, P2.19% as raw material;

[0029] Grind the raw materials until the particles with a fineness of -0.074mm account for 83% of the total mass of the raw ore, and add the nickel-molybdenum ore to the water at a liquid-solid mass ratio of 5:1 to obtain a mixed solution, and then add Water glass (dispersant), sodium hydroxide, obtain the alkaline nickel-molybdenum ore slurry that pH value is 9.5; Described water glass adds the ratio of 3-4mg per liter of mixed solution;

[0030] Mole ratio Cl - : Mo=2:1 Add sodium chloride to the alkaline nickel-molybdenum ore slurry, then pass into air for electrolysis, in order to ensure that the cathode will not produce hydrogen and explode, the air that passes into needs to be excessive; in the present embodiment, every ton of nickel The molybdenum ore is fed with 250L of air per hour, and the cell voltage is controlled at 7.2V and the current density is 3...

example 2

[0032] Using 1 ton of nickel-molybdenum ore containing Mo3.47%, Ni4.13%, Si10.52%, Ca8.25%, P1.25% as raw material,

[0033] After the raw material is ground until the particles with a fineness of -0.074mm account for 76% of the total mass of the raw ore, the nickel-molybdenum ore is added to the water at a liquid-solid mass ratio of 3:1 to obtain a mixed solution, and then added to the mixed solution Water glass (dispersant), sodium hydroxide, obtain the alkaline nickel-molybdenum ore slurry that pH value is 10.4; Described water glass adds the ratio of 3-4mg per liter of mixed liquor;

[0034] Mole ratio Cl - : Mo=2.5:1 adds sodium chloride in the alkaline nickel-molybdenum ore slurry, then feeds air and carries out electrolysis, for guaranteeing that the cathode will not produce hydrogen and explode, the air that feeds needs to be excessive; In the present embodiment, every ton of nickel The molybdenum ore is fed with 300L of air per hour, and the cell voltage is controlle...

example 3

[0036] Use 1 ton of nickel-molybdenum ore containing Mo0.18%, Ni4.00%, Si13.52%, Ca1.92%, P0.85% as raw material;

[0037] After the raw material is ground until the particles with a fineness of -0.074mm account for 78% of the total mass of the raw ore, the nickel-molybdenum ore is added to the water at a liquid-solid mass ratio of 4:1 to obtain a mixed solution, and then added to the mixed solution Water glass (dispersant), potassium hydroxide, obtain the alkaline nickel-molybdenum ore slurry that pH value is 11.3; Described water glass adds the ratio of 3-4mg per liter of mixed solution;

[0038] Mole ratio Cl - : Mo=3:1 adds sodium chloride in the alkaline nickel-molybdenum ore slurry, then feeds air and carries out electrolysis, for guaranteeing that the cathode will not produce hydrogen and explode, the air that feeds needs to be excessive; In the present embodiment, every ton of nickel The molybdenum ore is fed with 350L air per hour, and the cell voltage is controlled ...

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Abstract

The invention relates to a technique for leaching molybdenum from nickel-molybdenum ores by a wet process, belonging to the technical field of wet-process smelting of molybdenum. The technique comprises the following steps: by using nickel-molybdenum ore pulp as the raw material, adding water-soluble chlorine salt into the pulp in a Cl<->:Mo mole ratio of (2-3):1, stirring, and carrying out electrolysis under the condition of introducing oxygen-containing gas, wherein the bath voltage in the electrolysis process is 5-7.5V, the current density is 20-50 A / dm<2>, and the electrolysis temperature is 40-60 DEG C. By using the pulp electrolysis technique to leach the molybdenum, the molybdenum leaching rate is greater than or equal to 95%, and the electrolysis current efficiency is greater than or equal to 90%; and the technique can effectively and comprehensively recover molybdenum in the nickel-molybdenum ores and enhance the molybdenum resource utilization ratio. The technique has the advantages of low reaction temperature, high reaction speed, low energy consumption, high economy, environmental protection, high safety and high molybdenum leaching rate, and is convenient for implementing industrial application.

Description

technical field [0001] The invention relates to a process for wet leaching molybdenum from nickel-molybdenum ore, and belongs to the technical field of molybdenum hydrometallurgy. Background technique [0002] Molybdenum is an important strategic metal in my country, widely used in metallurgy, spraying, electronics and other industries. Nickel-molybdenum deposits are sedimentary black shale deposits, mainly distributed in Zunyi, Guizhou, Zhangjiajie, Hunan, Duchang, Hubei, Qujing, Yunnan, and Fuyang, Zhejiang. Nickel-molybdenum ore is a polymetallic composite ore, in which the molybdenum content is about 0.35% to 8.17%, mainly in the form of carpenter molybdenum ore. [0003] The industrial smelting of molybdenum-nickel ore is mainly to continue the smelting method of molybdenite, adopting the pyro-wet combined process, that is, the raw ore is oxidized and roasted first, and then the treated ore is leached and separated. will generate a lot of SO 2 Flue gas, due to the em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B34/34C25B1/34
CPCY02P10/20
Inventor 孙伟王丽刘润清胡岳华刘佳鹏
Owner CENT SOUTH UNIV
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