Method for preparing high-strength artificial marble by exciting and activating low-calorific-value coal ash slag

An artificial marble, low calorific value technology, used in chemical instruments and methods, manufacturing tools, clay preparation devices, etc.

Active Publication Date: 2022-01-21
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the artificial marble prepared by static stirring and static pressure forming, vibration stirring and vibrating pressure forming can strengthen the gelling performance of the material, which is irreproducible under the same raw mat

Method used

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  • Method for preparing high-strength artificial marble by exciting and activating low-calorific-value coal ash slag
  • Method for preparing high-strength artificial marble by exciting and activating low-calorific-value coal ash slag
  • Method for preparing high-strength artificial marble by exciting and activating low-calorific-value coal ash slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Firstly, the low-calorific-value coal fly ash is ball-milled into powder in a ball mill, and the low-calorific-value coal slag is screened through a 100-mesh sieve, and the low-calorific-value coal slag is selected with a particle size between 1-8mm. 15% cement, 30% low calorific value coal fly ash and 55% low calorific value coal slag are respectively weighed according to mass percentage. Transfer the above raw materials to the mixer, add water according to 30% of the weight of the gelled material, apply a 150Hz excitation frequency to the silo through the high-frequency pneumatic vibrator installed on the outer wall of the silo, and the air inlet pressure is 0.3MPa, vibrate and stir 180s. The material after the vibration activation is transferred to the 600mm×300mm rectangular stainless steel mold of the brick press, and the material is continuously vibrated by the high-frequency pneumatic vibrator. The vibration frequency is 43Hz, so that the material reaches a state...

Embodiment 2

[0033] Firstly, the low-calorific-value coal fly ash is ball-milled into powder in a ball mill, and the low-calorific-value coal slag is screened through a 100-mesh sieve, and the low-calorific-value coal slag is selected with a particle size between 1-8mm. 18% cement, 17% low calorific value coal fly ash and 65% low calorific value coal slag are respectively weighed according to mass percentage. Transfer the above raw materials to the mixer, add water according to 35% of the weight of the gelled material, apply a 400Hz excitation frequency to the silo through the high-frequency pneumatic vibrator installed on the outer wall of the silo, and the air inlet pressure is 0.45MPa, vibrate and stir 240s. The material after vibration activation is transferred to the 600mm×300mm rectangular stainless steel mold of the brick press, and the material is continuously vibrated by the high-frequency pneumatic vibrator. The frequency of the vibration is 44Hz, so that the material reaches a s...

Embodiment 3

[0035] Firstly, the low calorific value coal slag is screened to select the low calorific value coal slag with a particle size between 1-8mm. 20% cement and 80% low calorific value coal slag are respectively weighed according to mass percentage. Transfer the above raw materials to the mixer, add water according to 40% of the weight of the gelled material, apply a 400Hz excitation frequency to the silo through the high-frequency pneumatic vibrator installed on the outer wall of the silo, and the air inlet pressure is 0.6MPa, vibrate and stir 300s. The material after vibration activation is transferred to the 600mm×300mm rectangular stainless steel mold of the brick press, and the material is continuously vibrated by the high-frequency pneumatic vibrator. The vibration frequency is 45Hz, so that the material reaches a state of high-speed movement, thereby To make the material disperse more evenly and densely, apply a pressure of 4kN to the material while vibrating, and the vibr...

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Abstract

The invention relates to a method for preparing high-strength artificial marble by exciting and activating low-calorific-value coal ash slag. The raw materials mainly comprise fly ash slag, furnace slag and cement, the fly ash slag and the furnace slag are generated by combustion of low-calorific-value coal through a circulating fluidized bed, the cement and the fly ash slag serve as binding materials, and the furnace slag serves as aggregate. The raw materials in different proportions are intensively stirred by a vibration exciter and are subjected to vibration compression molding by the vibration exciter, and finally the high-strength artificial marble is prepared. The method has the advantages that high-frequency excitation is carried out in the mechanical stirring process, resonance is generated when the excitation frequency is close to the inherent frequency of materials, the materials obtain strong energy and are activated, the activity problem of the low-heating-value coal ash residues is solved, and the raw materials are evenly distributed on the microcosmic scale; in the forming process, the vibration exciter is used for vibration excitation, and an artificial marble green brick with a compact structure can be obtained under extremely small forming pressure; and a comprehensive utilization approach is provided for low-silicon, low-aluminum, high-calcium, high-sulfur and low-activity ash, and a technical support is provided for industrial production.

Description

technical field [0001] The invention relates to the technical field of synthesis of inorganic non-metallic materials, in particular to the field of preparing green building materials from industrial solid waste. Background technique [0002] Low calorific value coal is mainly composed of carbon, silicon, aluminum and a small amount of iron. It is a coal-based by-product produced during the mining, washing and processing of raw coal. Its fixed carbon content is less than 50%; the calorific value is low , below 3500kJ / kg; high combustion ash, above 40%, this type of coal cannot be used for combustion in pulverized coal boilers to generate electricity. According to the data from the National Bureau of Statistics, in 2020, my country's raw coal output will reach 3.902 billion tons, the raw coal washing rate will exceed 70%, and the discharged coal gangue, coal slime and other low calorific value coal resources will exceed 1 billion tons, equivalent to 20% of the raw coal mining ...

Claims

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Application Information

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IPC IPC(8): B28B1/10B28B11/24B28B11/08B28C5/08B28C5/48C04B28/04C04B18/10C04B111/54
CPCB28B1/10B28B11/24B28B11/0845B28C5/08B28C5/48C04B28/04C04B18/10C04B2111/00017C04B2111/545C04B18/08Y02W30/91
Inventor 张梅郭齐红王明涛郭敏张乐胡广超张晓彦
Owner UNIV OF SCI & TECH BEIJING
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