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A method for preparing light aggregate by low-temperature self-heating sintering of various types of coal gangue

A technology of coal gangue and self-heating, which is applied in the production of ceramic products, clay products, ceramic materials, etc., can solve the problems of reducing coal gangue landfill and accumulation, endangering the environment, and incapable of energy consumption, etc., to simplify the tail gas treatment process, The effect of reducing production cost and increasing dosage

Active Publication Date: 2022-07-26
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

[0005] In view of the above-mentioned technical defects in the process of using coal gangue to prepare lightweight aggregate in the prior art, and the fact that a large amount of coal gangue is buried or stacked in the open air, there are technologies that endanger the environment and human health, cannot be recycled, and the energy consumption in the process of recycling is too high Problem, the purpose of the present invention is to provide a method for preparing lightweight aggregate by low-temperature self-heating sintering of various types of coal gangue, which is used in combination with various types of coal gangue, without the need for additional use of clay, shale, etc. Under the condition of resource additives, relying on the adjustment of its own components to obtain lightweight aggregates with low density and high mechanical strength, it can absorb a large amount of coal gangue solid waste at the same time, reduce the landfill and accumulation of coal gangue, and reduce the cost of coal gangue. The potential danger caused by a large amount of accumulation, and in the preparation process of lightweight aggregate, at the same time by adjusting the particle size distribution and proportion of raw materials to reduce the firing temperature, can avoid adding flux, this method realizes the coal gangue lightweight bone Low energy consumption, high output, and low cost in the raw material production process, and the use of sintering machine processing has the advantage of large quantities, which is conducive to large-scale promotion and application

Method used

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  • A method for preparing light aggregate by low-temperature self-heating sintering of various types of coal gangue
  • A method for preparing light aggregate by low-temperature self-heating sintering of various types of coal gangue

Examples

Experimental program
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Effect test

Embodiment 1

[0060] (1) Take different types of gangue after crushing, mix CG1, CG2, CG3, CG4 according to the mass ratio of 2:2:4:2, and the content of the mixed material after mixing is: SiO 2 +Al 2 O 3 =69.1%; Fe 2 O 3 +CaO+MgO=18.22%; CaO-SiO 2 -Al 2 O 3 The relative contents of each component in the system are: 17.2%: 55.0%: 27.8%; the carbon content is 5%, the mixture is put into a cylindrical granulator and an appropriate amount of water is added for granulation.

[0061] (2) Spread an appropriate amount of base material on the bottom of the sintering machine trolley, and then continuously transport the granulated mixture to the horizontally moving trolley. The thickness of the cloth is 900mm. The trolley passes through the feeding port to the discharging port in turn Dry, preheat, sinter and cool to obtain qualified lightweight aggregates; the ignition temperature is 1050°C, the ignition time is 2min; the sintering temperature is 1250°C, the sintering time is 4min; the sinter...

Embodiment 2

[0064] (1) Take different types of gangue after crushing, mix CG1, CG2, CG3, CG4 according to 1:5:1:3, and the content of the mixed material after mixing is: SiO 2 +Al 2 O 3 =64.4%; Fe 2 O 3 +CaO+MgO=23.9%; CaO-SiO 2 -Al 2 O 3 The relative contents of each component in the system are: 23.6%: 60.1%: 16.3%; the carbon content is 4%, the mixture is put into a cylindrical granulator and an appropriate amount of water is added for granulation.

[0065] (2) Spread an appropriate amount of base material on the bottom of the sintering machine trolley, and then continuously transport the granulated mixture to the horizontally moving trolley. The thickness of the cloth is 700mm. Dry, preheat, sinter and cool to obtain qualified light aggregates; the ignition temperature is 1100°C, and the ignition is 1min; the sintering temperature is 1190°C, and the high temperature time is 3.2min; the sintering speed is 20mm / min; The discharge temperature is 150℃. The light aggregate discharge...

Embodiment 3

[0068] (1) Take different types of coal gangue after crushing, mix CG1, CG2, CG3, CG4 according to 1:4:2:3, and the content of the mixed material after mixing is: SiO 2 +Al 2 O 3 =64.3%; Fe 2 O 3 +CaO+MgO=23.7%; CaO-SiO 2 -Al 2 O 3 The relative contents of each component in the system are: 23.6%: 57.2%: 19.3%; the carbon content is 3%. Put the mixture into a cylindrical granulator and add an appropriate amount of water for granulation.

[0069] (2) Spread an appropriate amount of base material on the bottom of the sintering machine trolley, and then continuously transport the granulated mixture to the horizontally moving trolley. The thickness of the cloth is 800mm. Dry, preheat, sinter and cool to obtain qualified light aggregates; the ignition temperature is 1000°C, and the ignition is 1min; the temperature of the sintering section is 1100°C, the high temperature time is 2min, and the sintering speed is 17mm / min; the cooling method adopts air cooling, The discharge t...

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Abstract

The invention discloses a method for preparing light aggregate by low-temperature self-heating sintering of various types of coal gangue. , crushing and screening to obtain light aggregates with a density of 500-700. The method is used in combination with various types of coal gangue, and can obtain light aggregates with low density and high mechanical strength by adjusting its own components without using additional sintering additives, and can consume a large amount of coal gangue solid waste simultaneously. In the preparation process of light aggregate, the purpose of reducing the sintering temperature is achieved by adjusting the particle size distribution and ratio of raw materials, and the addition of flux can be avoided. This method realizes low energy consumption in the production process of coal gangue light aggregate. , high output, low cost, and the use of sintering machine processing has the advantage of large quantity, which is conducive to large-scale promotion and application.

Description

technical field [0001] The invention relates to a method for treating coal gangue solid waste, in particular to a method for preparing light aggregate by utilizing a variety of different types of coal gangue to achieve low-temperature self-heating sintering without adding other components. , which belongs to the technical field of solid waste resource utilization. Background technique [0002] With the continuous acceleration of my country's industrialization process, the discharge of industrial waste residues increases year by year, and the amount of industrial solid waste such as coal gangue continues to accumulate. Most of these wastes are landfilled or piled up in the open air, occupying a lot of land resources. Improper disposal will cause serious harm to the environment and human health, and this method misses the opportunity to convert coal gangue into resources as a circular economy thinking practice . In addition, coal gangue contains a large amount of elements su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/02C04B33/13C04B33/132C04B38/06
CPCC04B18/027C04B38/068C04B33/1328C04B33/13C04B2235/656C04B2235/6567C04B2235/95C04B2235/77C04B2235/96Y02P40/60
Inventor 范晓慧甘敏邢金鑫季志云郑浩翔陈许玲孙增青黄晓贤袁礼顺
Owner CENT SOUTH UNIV
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