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Method for extracting iron and titanium from coal gangue through magnetic separation

A technology of coal gangue and magnetic separation, applied in chemical instruments and methods, magnetic separation, titanium dioxide, etc., can solve problems such as high energy consumption and complicated production process, and achieve high energy consumption, complex production process, and obvious economic value Effect

Pending Publication Date: 2022-03-25
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for extracting iron and titanium from coal gangue by using magnetic separation, which is used to overcome the defects of complex production process and high energy consumption in the prior art

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  • Method for extracting iron and titanium from coal gangue through magnetic separation
  • Method for extracting iron and titanium from coal gangue through magnetic separation

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Embodiment 1

[0045] The present embodiment provides a method for extracting iron and titanium from coal gangue by magnetic separation, comprising the following steps:

[0046] Coal gangue is pretreated first to obtain iron oxide coarse ore containing titanium oxide.

[0047] Then crush and grind the coarse iron oxide ore to a particle size of about 1mm, then mix the crushed and ground iron oxide coarse ore with carbon powder at a ratio of 0.12:1 and mix evenly, and calcinate in a trolley furnace at a temperature of 1300°C. The time is 120 minutes, and minerals containing metallic iron are obtained.

[0048] Then grind the iron-containing minerals to 100μm, and use a magnetic separator to magnetically separate the ground minerals under the condition of a magnetic field strength of 200kA / m to extract iron powder.

[0049] Burn the remaining solid at 600°C until the quality does not change, and titanium oxide can be obtained. Titanium oxide is washed with hydrochloric acid to improve the gr...

Embodiment 2

[0052] The present embodiment provides a method for extracting iron and titanium from coal gangue by magnetic separation, comprising the following steps:

[0053] Coal gangue is pretreated first to obtain iron oxide coarse ore containing titanium oxide.

[0054] Then crush and grind the coarse iron oxide ore to a particle size of about 2 μm, then mix the crushed and ground iron oxide coarse ore with carbon powder at a ratio of 0.11:1, and then calcinate in a trolley furnace at a temperature of 1100°C. The time is 150 minutes, and minerals containing metallic iron are obtained.

[0055] Then grind the minerals containing metallic iron to 75μm, and use a magnetic separator to magnetically separate the ground minerals under the condition of a magnetic field strength of 240kA / m to extract iron powder.

[0056] Burn the remaining solid at 550°C until the quality does not change, and titanium oxide can be obtained. Titanium oxide is washed with hydrochloric acid to improve the gra...

Embodiment 3

[0059] The present embodiment provides a method for extracting iron and titanium from coal gangue by magnetic separation, comprising the following steps:

[0060] Coal gangue is pretreated first to obtain iron oxide coarse ore containing titanium oxide.

[0061] Then crush and grind the coarse iron oxide ore to a particle size of about 2mm, then mix the crushed and ground coarse iron oxide ore with carbon powder at a ratio of 0.13:1, and then calcinate in a trolley furnace at a temperature of 1300°C. The time is 90 minutes, and minerals containing metallic iron are obtained.

[0062] Then grind the iron-containing minerals to 150μm, and use a magnetic separator to magnetically separate the ground minerals under the condition of a magnetic field strength of 120kA / m to extract iron powder.

[0063] Burn the remaining solid at 650°C until the quality does not change, and titanium oxide can be obtained. Titanium oxide is washed with hydrochloric acid to improve the grade of tita...

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Abstract

The invention discloses a method for extracting iron and titanium from coal gangue by magnetic separation, which comprises the following steps: firstly, pretreating the coal gangue to obtain iron oxide crude ore containing titanium oxide so as to remove original aluminum and silicon in the coal gangue; crushing and grinding the iron oxide coarse ore containing titanium oxide until the particle size is less than or equal to 2mm so as to increase the surface area of an iron oxide solid, uniformly mixing the crushed and ground iron oxide coarse ore with carbon, and performing high-temperature calcination to obtain a mineral containing metallic iron; grinding the mineral containing the metal iron to disperse the iron powder and the titanium oxide, and performing magnetic separation on the ground mineral containing the metal iron by using a magnetic separator to separate the iron powder; and finally, burning the residual solid to remove redundant carbon powder to obtain titanium oxide. Iron and titanium oxide separated by the method provided by the invention are high in purity, both iron and titanium play an important role in production, and the method has obvious economic value.

Description

technical field [0001] The invention relates to the technical field of extracting iron and titanium from coal gangue, in particular to a method for extracting iron and titanium from coal gangue by using magnetic separation. Background technique [0002] Coal gangue is currently one of the largest industrial and mining solid wastes in China. It mainly comes from the coal mining process. It is a solid waste generated during coal production and processing, and is a symbiotic resource of coal. Coal gangue contains a large amount of iron elements, and efficient and quick extraction of iron metals can realize efficient utilization of resources. [0003] At present, the existing iron and titanium extraction methods are generally electric furnace reduction method and roasting and grinding method, which have the disadvantages of complex production process and high energy consumption. Contents of the invention [0004] The invention provides a method for extracting iron and titaniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G23/08B03C1/12C21B13/00C22B34/12
CPCC01G23/047C01G23/08C22B34/1213C22B34/1204C22B34/1209C21B13/006B03C1/12C01P2006/80
Inventor 李科杜红伟石星昊
Owner INNER MONGOLIA UNIV OF SCI & TECH