Coal slime tailings, sintered brick prepared from coal slime tailings and preparation method thereof

A technology for sintering bricks and tailings, which is applied in the direction of manufacturing tools, clay products, ceramic products, etc. It can solve the problems of high deformation of green body stacking, difficult use of coal slime, energy waste, etc., and achieve fast sintering speed and low production cost , the effect of reducing production costs

Pending Publication Date: 2019-08-23
西安煤科动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the lack of high-quality raw materials of sintered bricks and the common defects of sintered bricks, as well as the difficulty of using the coal slime after flotation in the existing technology, polluting the environment, and wasting energy; If the rate is too high, the height of the green body will be deformed and collapsed.

Method used

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  • Coal slime tailings, sintered brick prepared from coal slime tailings and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0082] Example 1: Preparation of standard bricks

[0083] The raw material of the present invention is the tailings separated by a specific separation column, and the percentage of each component in the tailings is: SiO 2 40%, Al 2 o 3 16%, Fe 2 o 3 is 1%, CaO is 1%, and the rest are other elements; the plasticity index is 11; the moisture content is 22-25%, the calorific value is 1.25MJ / Kg, and the particle size is less than 0.045mm, which accounts for 95%. For example:

[0084] Standard bricks are prepared as follows:

[0085] Step 1: Transport the raw material tailings to a coal slime drying equipment for drying to a water content of 12-15%. The coal slime drying equipment is a coal slime drum drying system.

[0086] Step 2: Transport the tailings obtained in step 1 to two continuous first and second stirring systems of SJJ280×36 for stirring and rolling; the stirring speed of the first stirring system is 100-3000r / min, preferably 200 ~220r / min; the stirring speed of ...

example 2

[0091] Example 2: Preparation of porous bricks

[0092] The tailings whose raw materials are separated by a specific separation column, the percentage of each component in the tailings is: SiO 2 45%, Al 2 o 3 20%, Fe 2 o 3 CaO is 2%, CaO is 2%, and the rest are other elements; plasticity is 12; calorific value is 1.6MJ / Kg, the moisture content of the tailings is 22-25%, and the particle size is <0.045mm, accounting for 95% as an example.

[0093] The preparation method of the porous brick is as follows:

[0094] Step 1: Transport the raw material tailings to a coal slime drying equipment for drying to a water content of 12-15%. The coal slime drying equipment is a coal slime drum drying system.

[0095] Step 2: Transport the tailings obtained in step 1 to two continuous first and second stirring systems of SJJ280×36 for stirring and rolling; the stirring speed of the first stirring system is 100-3000r / min, preferably 200 ~220r / min; the stirring speed of the second stirri...

example 3

[0100] Example 3: Preparation method of hollow brick

[0101] The raw material is the tailings separated by a specific sorting column, and the percentage of each component in the tailings is: SiO 2 50%, Al 2 o 3 25%, Fe 2 o 3 is 3%, CaO is 3%, and the rest are other elements; the plasticity is 13; the calorific value is 2.0MJ / Kg, the moisture content of the tailings is 22-25%, and the particle size is <0.045mm, accounting for 95% as an example.

[0102] The preparation method of the hollow brick is as follows:

[0103] Step 1: Transport the raw material tailings to a coal slime drying equipment for drying to a water content of 12-15%. The coal slime drying equipment is a coal slime drum drying system.

[0104] Step 2: Transport the tailings obtained in step 1 to two continuous first and second stirring systems of SJJ280×36 for stirring and rolling; the stirring speed of the first stirring system is 100-3000r / min, preferably 200 ~220r / min; the stirring speed of the second...

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Abstract

The invention belongs to the field of wall material production, and particularly relates to a coal slime tailings, a sintered brick prepared from coal slime tailings and a preparation method thereof.The raw material of the sintered brick is the tailings separated by a separation column; the tailings comprises the following, by mass 40%-55% of SiO2, 16%-30% of Al2O3, 1%-5% of Fe2O3, 1%-5% of CaO,and the balance other elements; and the calorific value of the coal slime tailings is less than or equal to 2.5 MJ/kg. The sintered brick has high compressive strength and light weight, and has the characteristics of frost resistance, sound absorption, corrosion resistance, water permeability and air permeability; the brick has uniform size and no deviation; the brick surface is clean and smooth,and edges and corners are distinct; the color is uniform; and the preparation method has simple process, so that the energy waste is reduced.

Description

technical field [0001] The invention belongs to the field of wall material production, and in particular relates to coal slime tailings, a sintered brick prepared therefrom and a preparation method thereof. Background technique [0002] Coal slime is one of the solid wastes with the largest discharge in my country at present, and the reuse of coal slime resources is an inevitable choice for my country's coal-based energy structure. At present, the annual amount of raw coal selected in my country is about 2.4 billion tons, and the total amount of coal slime produced is 200-300 million tons. [0003] Coal slime is composed of minerals such as kaolin, argillaceous shale, clay, coal, etc. After repeated flotation, soaking, stirring, and pressure filtration, the coal and mud are mutually adsorbed and completely muddy and difficult to use. At present, part of the coal slime is used for power generation in power plants or coal gangue power plants, and part of the coal slime is rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00B03D1/02B03D1/14B28B3/20B28B11/24C04B33/132C04B38/00
CPCB09B3/00B09B5/00B03D1/14B03D1/02C04B33/132C04B38/00B28B3/20B28B11/243Y02P40/60
Inventor 张岩斌
Owner 西安煤科动力科技有限公司
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