Method for extracting valuable elements from coal gangue

A technology of valuable elements and coal gangue, applied in chemical instruments and methods, silica, inorganic chemistry, etc., to achieve the effect of improving activity

Pending Publication Date: 2022-04-12
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for extracting valuable elements from coal gangue, which is used to overcome the defects of high-temperature activation treatment and high-concentration acid-base treatment in the prior art

Method used

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  • Method for extracting valuable elements from coal gangue

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Effect test

Embodiment 1

[0049] This embodiment provides a method for extracting valuable elements from coal gangue, such as figure 1 shown, including the following steps:

[0050] S1: Crush and grind coal gangue to 74 μm, remove carbon and sulfur, mix it with sodium carbonate at a ratio of 1:1.5, and roast it in a trolley furnace at 830°C for 120 minutes to obtain activated minerals. After activation, most of the silica is converted into sodium silicate.

[0051] S2: Dissolving the activated mineral in water at 85° C., stirring continuously, and suction filtering to obtain sodium silicate solution and slag.

[0052] S3: Introduce carbon dioxide into the sodium silicate solution to precipitate silicic acid, and produce sodium carbonate for recycling;

[0053] After sulfuric acid is added to the slag for dissolution, a sediment and a supernatant are obtained; the sediment is crystalline insoluble silicon dioxide, and the supernatant is a solution rich in iron and aluminum ions.

[0054] S4: Using so...

Embodiment 2

[0060] This embodiment provides a method for extracting valuable elements from coal gangue, such as figure 1 shown, including the following steps:

[0061] S1: Crush and grind coal gangue to 36 μm, remove carbon and sulfur, mix it with sodium carbonate at a ratio of 1:1.2, and roast it in a trolley furnace at 830°C for 70 minutes to obtain activated minerals. After activation, most of the silica is converted into sodium silicate.

[0062] S2: Dissolving the activated mineral in water at 80° C., stirring continuously, and suction filtering to obtain sodium silicate solution and slag.

[0063] S3: Introduce carbon dioxide into the sodium silicate solution to precipitate silicic acid, and produce sodium carbonate for recycling;

[0064] After sulfuric acid is added to the slag for dissolution, a sediment and a supernatant are obtained; the sediment is crystalline insoluble silicon dioxide, and the supernatant is a solution rich in iron and aluminum ions.

[0065] S4: Using sod...

Embodiment 3

[0071] This embodiment provides a method for extracting valuable elements from coal gangue, such as figure 1 shown, including the following steps:

[0072] S1: Crush and grind coal gangue to 15 μm, remove carbon and sulfur, mix it with sodium carbonate at a ratio of 1:1.2, and roast it in a trolley furnace at 830°C for 70 minutes to obtain activated minerals. After activation, most of the silica is converted into sodium silicate.

[0073] S2: Dissolving the activated mineral in water at 90° C., stirring continuously, and suction filtering to obtain sodium silicate solution and slag.

[0074] S3: Introduce carbon dioxide into the sodium silicate solution to precipitate silicic acid, and produce sodium carbonate for recycling;

[0075] After sulfuric acid is added to the slag for dissolution, a sediment and a supernatant are obtained; the sediment is crystalline insoluble silicon dioxide, and the supernatant is a solution rich in iron and aluminum ions.

[0076] S4: Using sod...

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Abstract

The invention discloses a method for extracting valuable elements from coal gangue, which adopts alkali low-temperature roasting thermal activation as a main activation method and overcomes the defects of traditional high-temperature activation and acid leaching. Alkali low-temperature roasting thermal activation has the advantages of low one-time investment, higher product grade, low energy consumption, high reaction rate, no pollution to the environment and the like, part of products can be recycled, and the economical efficiency is greatly improved. Meanwhile, equipment adopted by the method provided by the invention is simple, the reaction is easy to control, and industrial continuous production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of extracting valuable elements, in particular to a method for extracting valuable elements from coal gangue. 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. The comprehensive discharge of coal gangue accounts for 10-20% of the raw coal output. At present, my country has accumulatively stockpiled more than 6 billion tons of coal gangue, and the amount of newly produced coal gangue is increasing at a rate of 100 million tons per year, occupying a large amount of land and causing many environmental problems. [0003] Coal gangue is usually stacked in the open air, and weathering and decomposition will produce a large amount of heavy metals or acidic water, which will seep into groundwater, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01F7/441C01B33/12
Inventor 李科杜红伟石星昊
Owner INNER MONGOLIA UNIV OF SCI & TECH
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