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Method for preparing lightweight aggregate through low-temperature self-heating sintering of multiple types of coal gangues

A technology of coal gangue and self-heating, applied in the production of ceramic products, clay products, ceramic materials, etc., can solve problems such as inability to consume energy, endanger the environment, and reduce landfill and accumulation of coal gangue

Active Publication Date: 2021-09-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing lightweight aggregate through low-temperature self-heating sintering of multiple types of coal gangues
  • Method for preparing lightweight aggregate through low-temperature self-heating sintering of multiple types of coal gangues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Take different types of coal gangue after crushing, mix CG1, CG2, CG3, and 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 content of each component in the system is: 17.2%: 55.0%: 27.8%; the carbon content is 5%, the mixture is put into a cylinder granulator and an appropriate amount of water is added for granulation.

[0061] (2) Sprinkle 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 Drying, preheating, sintering, and cooling to obtain qualified lightweight aggregate; the ignition temperature is 1050°C, and the ignition time is 2min; the sintering temperature is 1250°C, and the sintering time is 4min; the sintering speed is 22mm / ...

Embodiment 2

[0064] (1) Take different types of crushed coal gangue, mix CG1, CG2, CG3, and 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 content of each component in the system is: 23.6%: 60.1%: 16.3%; the carbon content is 4%, the mixture is put into a cylinder granulator and an appropriate amount of water is added for granulation.

[0065] (2) Sprinkle 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. The trolley passes through the Drying preheating, sintering and cooling to obtain qualified lightweight aggregate; the ignition temperature is 1100°C, ignition 1min; sintering temperature is 1190°C, high temperature time is 3.2min; sintering speed is 20mm / min; The discharge temperature is 150°C. The ligh...

Embodiment 3

[0068] (1) Take different types of coal gangue after crushing, mix CG1, CG2, CG3, and 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 content of each component in the system is: 23.6%: 57.2%: 19.3%; the carbon content is 3%. Put the mixture into a cylinder granulator and add appropriate amount of water for granulation.

[0069] (2) Sprinkle 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. The trolley passes through the Drying, preheating, sintering, and cooling to obtain qualified lightweight aggregate; the ignition temperature is 1000°C, ignition 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...

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Abstract

The invention discloses a method for preparing lightweight aggregate through low-temperature self-heating sintering of multiple types of coal gangues. The method comprises the following steps: crushing, proportioning, mixing, granulating, distributing, igniting, sintering, cooling, crushing and screening multiple different types of coal gangues in sequence to obtain the lightweight aggregate with the density grade of 500-700. According to the method, multiple types of coal gangues are matched and combined for use, the lightweight aggregate with small density and high mechanical strength is obtained through self component adjustment under the condition of not additionally using a sintering additive, and a large amount of multiple types of coal gangue solid waste can be consumed at the same time; in the preparation process of the lightweight aggregate, the aim of reducing the sintering temperature is achieved by adjusting the particle size distribution and proportion of the raw materials, so that the addition of a fluxing agent can be avoided; and the method realizes low energy consumption, high yield and low cost in the production process of the coal gangue lightweight aggregate, has the advantage of large quantity by utilizing a sintering machine for treatment, and is beneficial to large-scale popularization and application.

Description

technical field [0001] The present invention relates to a treatment method for coal gangue solid waste, in particular to a method for preparing lightweight aggregate by using multiple different types of gangue in coordination and matching without adding other components to realize low-temperature self-heating sintering , belonging 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 has increased year by year, and the amount of industrial solid waste such as coal gangue has continued to accumulate. Most of these wastes are landfilled or stacked in the open air, occupying a large amount of land resources. If not disposed of properly, it will cause serious harm to the environment and human health, and this method misses the opportunity to transform coal gangue into resources as a practice of circular economy thinking . In...

Claims

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Application Information

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Patent Type & Authority Applications(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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