Method for preparing secondary coal ash of goods by using high-calcium coal ash

A technology of high-calcium fly ash and secondary fly ash, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of complex process and high cost, achieve high social benefits and solve costs The effect of high and high economic benefit

Inactive Publication Date: 2012-07-18
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of complex process, high cost and no suitable materials in the application of high-calcium fly ash, the present invention proposes a method of using high-

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dry the high-calcium fly ash and grind it in a ball mill for 10 minutes. The indicators are as follows: the sieve residue of 45 μm is 12%, and the specific surface area is 455m 2 / kg, free calcium oxide is 4.2%, 28d activity index is 73.9%, loss on ignition is 3.07, sulfur trioxide content is 0.60%;

[0016] (2) Grind the furnace bottom ash in a ball mill for 30 minutes, and measure its physical properties. The sieve residue at 45 μm is 16.4%, and the specific surface area is 533m 2 / kg, the free calcium oxide is 0.87%, the activity index of 28d is 76.3%, the loss on ignition is 3.10, and the sulfur trioxide content is 0.67%;

[0017] (3) Mix the above-mentioned high-calcium fly ash and furnace bottom ash evenly in a mass ratio of 7:3.

[0018] Calculated: the free calcium oxide content is 3.2%, the 45μm sieve residue is 13.32%, and the specific surface area is 478.4m 2 / kg, loss on ignition is 3.08, sulfur trioxide content is 0.62%;

[0019] The measurement resu...

Embodiment 2

[0023] Grind the baked high-calcium fly ash in a ball mill for 5 minutes, and measure its physical properties. The free calcium oxide is 6.2%, the 45μm sieve is 5%, and the specific surface area is 518m 2 / kg, the activity index of 28d is 70.7%, the loss on ignition is 0.84, and the sulfur trioxide content is 1.93%;

[0024] The furnace bottom ash was ground in a ball mill for 15 minutes, and its physical properties were measured. The free calcium oxide was 0.87%, the 45μm sieve was 32.4%, and the specific surface area was 341m 2 / kg, the activity index of 28d is 72.4%, the loss on ignition is 3.10, and the sulfur trioxide content is 0.67%;

[0025] Composite the ground two kinds of ash according to the ratio of 1:1. According to the above calculation, the content of free calcium oxide is 3.53%, the sieve residue of 45 μm is 18.7%, and the specific surface area is 429.5m 2 / kg, the loss on ignition was 1.97, the content of sulfur trioxide was 1.3%; the Rayleigh clamp expansio...

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Abstract

The invention discloses a method for preparing secondary coal ash of goods by using high-calcium coal ash, which comprises the following steps of: (1) milling the high-calcium coal ash into 45 microns and sieving and remaining 4%-14%, milling the hearth ash into 45 microns and sieving and remaining 15%-33%, wherein the indexes of the high-calcium coal ash and the hearth ash are as follows: 28d activity index is more than 70%, the loss on ignition is not more than 8%, sulfur trioxide is not more than 3% and water content is not more than 1%; and (2) calculating the mixing ratio of the high-calcium coal ash to the hearth ash, causing the sieved residue of the 45-micron mixed ash to be not more than 20%, and according to the calculated mixing ratio, uniformly mixing the high-calcium coal ash with the hearth ash. According to the method provided by the invention, the demand on the fineness of the high-calcium coal ash is reduced, the problem of high cost caused by high power consumption during the process of milling the high-calcium coal ash is solved, the economic benefit is higher, the high-calcium coal ash and the solid wastes, namely, the hearth ash, are fully utilized, the environmental protection is facilitated and the social benefit is higher.

Description

technical field [0001] The invention belongs to the technical field of powder materials, and in particular relates to a method for using high-calcium fly ash to prepare commercial secondary fly ash. Background technique [0002] High-calcium fly ash is a kind of fly ash with high calcium oxide content discharged from thermal power plants when lignite and sub-bituminous coal are used as fuel. It not only contains a certain amount of hydraulic crystal minerals but also has potential activity. Due to its high content of free calcium oxide, high-calcium fly ash may cause poor stability of cement and cracking of concrete, which greatly affects the application of high-calcium fly ash. [0003] The application of high-calcium fly ash is affected by the stability problem, so it is extremely important to alleviate the stability problem of high-calcium fly ash. Generally, the methods to solve the stability problem of high-calcium fly ash include grinding and re-blending, but for high...

Claims

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Application Information

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IPC IPC(8): C04B18/08
CPCY02W30/91
Inventor 沈燕华朱春江张树青
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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