Coal gangue roasting, deironing and whitening method and whitened coal gangue material prepared through coal gangue roasting, deironing and whitening method

A technology of coal gangue and roasting, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problem of high energy consumption

Active Publication Date: 2022-03-18
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the coal gangue resource recovery method disclosed above, the calcination of coal gangue is carried out at a high temperature above 900°C, that is, at a time close to or even e

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0029] In the present invention, the preparation method of described coal gangue powder preferably comprises the following steps:

[0030] 1) crushing the coal gangue raw ore to obtain coal gangue particles;

[0031] 2) Grinding the coal gangue particles obtained in the step 1) to obtain coal gangue powder.

[0032] In the present invention, the coal gangue raw ore is preferably crushed to obtain coal gangue particles.

[0033] In the present invention, the coal gangue raw ore is preferably high-iron, low-titanium coal gangue; TiO in the coal gangue raw ore 2 The content of is preferably less than 0.5wt.%. The invention adopts coal gangue with low content of titanium element, which can reduce the influence of titanium element in the follow-up process.

[0034] In the present invention, the crushing is preferably crushed by a jaw crusher. The present invention has no special limitation on the specific model of the jaw crusher, and commercially available products well known ...

Embodiment 1

[0062] A coal gangue roasting method for removing iron and whitening, comprising the following steps:

[0063] (1) Roasting and decarburizing coal gangue powder to obtain decarburized coal gangue; the particle diameter of the coal gangue powder≤0.045mm; TiO in the coal gangue powder 2 %; the temperature of the roasting decarburization is 550°C, the holding time of the roasting decarburization is 60min, and the atmosphere of the roasting decarburization is an air atmosphere; the heating rate of the roasting decarburization temperature is 10°C / min;

[0064] (2) the decarbonized coal gangue that described step (1) obtains and (NH 4 ) 2 SO 4 After mixing, heat up to the low-temperature roasting temperature for low-temperature roasting to obtain roasted coal gangue and roasting tail gas; the decarburized coal gangue and (NH 4 ) 2 SO 4 The mass ratio of the low-temperature roasting is 1:0.75; the temperature of the low-temperature roasting is 450° C., the holding time of the l...

Embodiment 2

[0070] The temperature of roasting and decarburization in the step (1) is 650° C., the holding time of roasting and decarburization is 90 min, and other conditions are the same as in Example 1.

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Abstract

The invention provides a coal gangue roasting, deironing and whitening method, and belongs to the technical field of comprehensive utilization of coal gangue solid waste resources. The coal gangue powder is roasted and decarbonized in advance, so that carbon in the coal gangue is converted into carbon dioxide, and meanwhile, kaolinite minerals in the coal gangue are converted into metakaolinite; in the low-temperature roasting process, ammonium salt is decomposed and reacts with metal iron oxide in the decarburized coal gangue to generate soluble iron salt, then colored iron metal can be removed after rinsing, iron removal under the low-temperature condition is achieved, and the whiteness is improved; color development impurities (carbon and iron impurities) in the coal gangue are removed through two times of roasting, the roasting temperature is low, and the energy consumption in the coal gangue treatment process is greatly reduced. The result of the embodiment shows that the whiteness of the whitened coal gangue prepared by the method provided by the invention reaches 75-85%, and the content of Fe2O3 in the coal gangue is less than or equal to 0.75 wt.%.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of coal gangue solid waste resources, in particular to a method for roasting coal gangue to remove iron and whiten it and the whitened coal gangue material prepared therefrom. Background technique [0002] After years of rapid development of the coal industry, the stockpile of coal gangue has increased significantly, and it is still growing rapidly at an annual rate of about 200 million tons. The massive stockpiling of coal gangue has brought about a series of problems, such as a large amount of land occupation, harmful substances polluting the soil, atmosphere, groundwater and other environmental problems, potential surface subsidence, causing landslides, debris flows and other ecological environmental problems. However, in addition to its harmfulness, the existence of various minerals and valuable elements in coal gangue shows its resourceful side. For coal gangue, a bulk soli...

Claims

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Application Information

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IPC IPC(8): B09B3/40B09B3/35B09B3/10
Inventor 孙志明李春全吴家铭
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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