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Reinforced dump leaching method of low grade molybdenite

A molybdenite and enhanced reactor technology, applied in the direction of improving process efficiency, can solve problems such as unsatisfactory economic and social benefits.

Inactive Publication Date: 2015-06-24
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] With the continuous mining of molybdenum ore resources, there are fewer and fewer high-grade molybdenum ore resources available, and a large number of low-grade molybdenum ore are stockpiled as lean ore and are treated by the traditional "flotation-oxidation roasting-leaching" process These low-grade molybdenum ores cannot obtain satisfactory economic and social benefits

Method used

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  • Reinforced dump leaching method of low grade molybdenite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The grade of molybdenum in molybdenite is 0.051%.

[0039] Adopt the method described in the present invention to comprise the steps:

[0040] (1) Crushing: Crushing the ore particle size to -0.5mm.

[0041](2) Soda mixing, pelletizing, slaking: Add 0.5% sodium hydroxide (ratio to ore mass), 0.5% oxidant (mass ratio to ore) and 0.1% pelleting agent to the ore obtained in step (1), according to the liquid-solid ratio Stir at 0.20L / kg to make the leaching agent and ore evenly infiltrate and make balls; the wet ore after ball making is packed into a column and matured at 5°C for 1 day.

[0042] (3) Leaching: Use 2g / L sodium hydroxide and 1g / L sodium hypochlorite solution as leaching agents for the wet ore obtained in step (2), and heap leaching for 20 days at a temperature of 5°C.

[0043] (4) Treatment of leachate: the leachate obtained in step (3) is prepared by ion exchange or precipitation to prepare products such as ammonium molybdate or calcium molybdate. The leac...

Embodiment 2

[0046] The grade of molybdenum in molybdenite is 0.5%.

[0047] Adopt the method described in the present invention to comprise the steps:

[0048] (1) Crushing: Crushing the ore to a particle size of 5mm.

[0049] (2) Soda mixing, pelletizing, slaking: add 5% sodium hydroxide (ratio to ore mass), 5% oxidant (mass ratio to ore) and 8% pelleting agent to the ore obtained in step (1), according to the liquid-solid ratio Stir at 0.05L / kg to make the leaching agent and ore uniformly infiltrate and make balls; the wet ore after ball making is packed into a column and matured at 40°C for 10 days.

[0050] (3) Leaching: Use 40g / L sodium hydroxide and 10g / L sodium hypochlorite solution as leaching agents for the wet ore obtained in step (2), and heap leaching for 7 days at a temperature of 40°C.

[0051] (4) Treatment of leachate: the leachate obtained in step (3) is prepared by ion exchange or precipitation to prepare products such as ammonium molybdate or calcium molybdate. The l...

Embodiment 3

[0054] The grade of molybdenum in molybdenite is 0.114%.

[0055] Adopt the method described in the present invention to comprise the steps:

[0056] (1) Crushing: Crushing the ore to a particle size of 3mm.

[0057] (2) Soda mixing, pelletizing, slaking: Add 1.5% sodium hydroxide (ratio to ore mass), 1.5% oxidant (mass ratio to ore) and 2% pelleting agent to the ore obtained in step (1), according to the liquid-solid ratio Stir at 0.20L / kg to make the leaching agent and ore uniformly infiltrate and make balls; the wet ore after ball making is packed into a column and matured at 20°C for 5 days.

[0058] (3) Leaching: Use 20g / L sodium hydroxide and 5g / L sodium hypochlorite solution as leaching agents for the wet ore obtained in step (2), and heap leaching for 10 days at a temperature of 20°C.

[0059] (4) Treatment of leachate: the leachate obtained in step (3) is prepared by ion exchange or precipitation to prepare products such as ammonium molybdate or calcium molybdate. ...

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Abstract

A method is disclosed against the technical problems of long pump leaching period and low molybdenum leaching rate of low grade molybdenite. A granulation pelletizing technology is used to fully expose molybdenum in molybdenite and realize ultrafine particle molybdenite pump leaching, and an alkali mixing slaking reinforcement technology is used to increase the reaction speed and rate of a leaching agent with the target element in order to shorten the leaching period and improve the leaching rate of the target product. The method simplifies the floating-roasting-stirring leaching grinding process of traditional methods, avoids pollution of SO2 to air, optimizes Method for Recovering Molybdenum through Dump Leaching of Low Grade Molybdenite, and realizes further improvement of the resource recovery rate, reduction of the running cost and improvement of the economic exploitation values of the low grade molybdenite through the granulation pelletizing technology and the alkali mixing slaking reinforcement technology.

Description

technical field [0001] The invention belongs to the technical field of molybdenum leaching in low-grade molybdenite, and in particular relates to an enhanced leaching method for improving molybdenum leaching rate in molybdenite and shortening leaching period Background technique [0002] The processing methods of molybdenite include pyrometallurgy and hydrometallurgy. At present, for the treatment of molybdenum concentrate, the combined oxidation roasting-wet treatment process is widely used in industry. [0003] The method of oxidation roasting mainly includes the following three kinds: [0004] (1) Direct oxidation roasting method: The purpose of oxidation roasting of molybdenite concentrate is to separate molybdenum and sulfur in molybdenum dioxide, so that molybdenum disulfide, which is insoluble in ammonia water, can be converted into ammonia-soluble molybdenum disulfide after roasting. Molybdenum oxide. The reaction formula is: [0005] MoS 2 +3O 2 =MoO 2 +2SO ...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B1/243C22B34/34
CPCY02P10/20
Inventor 周根茂曾毅君孟舒胥国龙
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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