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Preparation method of high-activity spherical calcined coal gangue powder

A technology for calcining coal gangue with high activity, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of lack of synergistic consideration of particle shape control and pozzolanic activity improvement, and achieve a significant low-carbon effect , the effect of high sphericity

Active Publication Date: 2021-12-31
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the utilization of coal gangue as a building material resource needs to further expand new application areas. When used as a mixture or admixture, there is a lack of key technologies that synergistically consider particle shape control and pozzolanic activity enhancement.

Method used

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  • Preparation method of high-activity spherical calcined coal gangue powder
  • Preparation method of high-activity spherical calcined coal gangue powder

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Effect test

Embodiment 1

[0032]A method for producing high-activity spherical calcined coal gangue by combined jet pulverization-radio frequency plasma technology, comprising the following production steps:

[0033] (1) Jet crushing of coal gangue. Put the above-mentioned pre-mixed mixture powder into the jet crushing equipment. The main operating parameters of the jet mill are: compressed air flow rate 4L / min, installed power 20 kW, production capacity 50 kg / h , The discharge particle size is 2~60μm;

[0034] (2) RF plasma high temperature treatment, the RF plasma system consists of the following parts: RF plasma torch, RF plasma power supply, gas supply and powder feeding system, reaction chamber and collection chamber and bracket, vacuum pumping system, electrical control and Measuring systems, chillers. The operating parameters of the radio frequency plasma generation chamber are: power 50 kW, frequency 2.5 MHz, working gas is air, and the flame core temperature of the plasma generator is 900-100...

Embodiment 2

[0037] A method for producing high-activity spherical calcined coal gangue by combined jet pulverization-radio frequency plasma technology, comprising the following production steps:

[0038] (1) Preparation of raw meal: The gangue powder and red mud are weighed according to the mass ratio of 95:5 and mixed in advance.

[0039] (2) Airflow milling treatment: Put the above pre-mixed mixture powder into the airflow milling equipment. The main operating parameters of the airflow mill are: compressed air flow rate 10L / min, installed power 80 kW, production capacity 130kg / h, feed The particle size is not more than 5mm, the output particle size is 2-50μm, and the carrier gas flow is nitrogen.

[0040] (3) RF plasma high temperature treatment, the RF plasma system consists of the following parts: RF plasma torch, RF plasma power supply, gas supply and powder feeding system, reaction chamber and collection chamber and bracket, vacuum pumping system, electrical control and Measuring s...

Embodiment 3

[0043] A method for producing high-activity spherical calcined coal gangue by combined jet pulverization-radio frequency plasma technology, comprising the following production steps:

[0044] (1) Preparation of raw meal: Accurately weigh coal gangue powder, calcium carbide slag, and potassium sulfate according to the mass ratio of 92:7:1 and mix them in advance.

[0045] (2) Airflow milling treatment: Put the above pre-mixed mixture powder into the airflow milling equipment. The main operating parameters of the airflow mill are: compressed air flow rate 10L / min, installed power 100kW, production capacity 150kg / h, feed particle The diameter is not more than 5mm, the discharge particle size is 2~50μm, and the carrier airflow is air.

[0046] (3) RF plasma high temperature treatment, the RF plasma system consists of the following parts: RF plasma torch, RF plasma power supply, gas supply and powder feeding system, reaction chamber and collection chamber and bracket, vacuum pumpin...

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Abstract

The invention discloses a method for producing a high-activity spherical calcined coal gangue powder by jointly adopting an airflow crushing-radio frequency plasma technology. The method comprises the following steps: crushing coal gangue into certain particles through an airflow crushing system to obtain ultrafine powder, and carrying out plasma high-temperature treatment on the ultrafine powder through a radio frequency plasma system to obtain the calcined coal gangue powder with high activity and high sphericity rate. The airflow crushing and calcining of the coal gangue form an integrated process flow, the energy consumption can be obviously reduced, the prepared calcined coal gangue powder has very high pozzolanic activity, the spherical particle morphology is also beneficial to reducing the water demand, and the technical effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for producing high-activity spherical calcined coal gangue powder by combined jet crushing and radio frequency plasma technology. Background technique [0002] Coal gangue is solid waste in the coal mining process, which contains certain organic matter and is hard in texture. According to statistics, its emissions in 2020 are close to 600 million tons. At present, the comprehensive utilization rate of coal gangue is not higher than 30%. Due to geographical reasons, the utilization rate of coal gangue in some areas is not higher than 10%. A large amount of coal gangue needs to occupy land resources and destroy the ecological environment of the mining area. Its spontaneous combustion and rainwater also cause certain pollution to the atmosphere and water environment. The resource utilization of coal gangue is imminent. Judging from the characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/04C04B20/02C04B18/12
CPCC04B20/04C04B20/026C04B18/12Y02W30/91
Inventor 孙化强吴文达
Owner FUZHOU UNIV
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