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Soil curing agent based on desulfurized fly ash activity and preparation method and application thereof

A technology of soil stabilizer and desulfurization ash, which is applied in soil protection, infrastructure engineering, construction, etc. It can solve the problems of large differences in calcium oxide and sulfur trioxide content, increase the difficulty of desulfurization ash, and consume large amounts of energy. The effect of reducing the risk of volume instability, avoiding the risk of volume instability, and low price

Inactive Publication Date: 2014-09-17
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If desulfurization ash is used directly, there is a risk of volume instability and it is difficult to use directly
At the same time, due to the inconsistent desulfurization technology and level in different regions, the content of calcium oxide and sulfur trioxide in desulfurization ash varies greatly, which further increases the difficulty of direct use of desulfurization ash
Calcining desulfurized ash into desulfurized gypsum consumes a lot of energy. Under the background of increasing environmental protection requirements, it is difficult for a desulfurized gypsum production line to obtain approval

Method used

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  • Soil curing agent based on desulfurized fly ash activity and preparation method and application thereof
  • Soil curing agent based on desulfurized fly ash activity and preparation method and application thereof

Examples

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preparation example Construction

[0029] The method for preparing soil solidifying agent provided by the invention, the steps are:

[0030] (1) Carry out chemical analysis or fluorescence analysis on desulfurization ash to obtain its main characteristic components, focus on testing the content of sulfur trioxide in desulfurization ash, and convert it into calcium sulfate content; test the content of alumina in slag powder; according to the molecular weight of ettringite Classical structure 3CaO·Al 2 o 3 · 3CaSO 4 32H 2 O, control the calcium sulfate in the desulfurization ash and the alumina in the slag powder, the molar ratio of the two should not exceed 3:1; eliminate the potential volume instability in the desulfurization ash from the source. In order to promote the formation of ettringite as soon as possible, the content of alumina can be increased appropriately. Due to the different desulfurization technologies in various places, there are certain differences in the composition ratio of desulfurizatio...

Embodiment 1

[0036] (1) Weigh 5-10mm and 10-15mm of the second-grade crushed stones, the mass percentage of crushed stones is 85%, and this product accounts for 15%. The desulfurization ash used is from Nanjing, and the result of fluorescence analysis shows that the content of sulfur trioxide is 18.9% (mass ratio). The slag micropowder is S95 grade, in which the alumina content is 12.15% (mass ratio), sulfur trioxide is converted into calcium sulfate, and its proportion is about 27.45% (mass ratio), calculated according to the molecular structure of ettringite, the desulfurization The theoretical mass ratio of ash to slag fine powder should not exceed 1.8:1, and the actual use ratio is 1:1. Add a certain amount of sodium hydroxide and calcium stearate, that is, desulfurization ash: mineral powder: sodium hydroxide: calcium stearate = 1:1:0.13:0.08 (mass ratio).

[0037] (2) Take by weighing graded crushed stone (accounting for 85%) and this product (accounting for 15%), respectively selec...

Embodiment 2

[0042] (1) In order to study the water stability of this product, desulfurization ash and slag powder were mixed according to the ratio (mass ratio) of 3:1, 1:1 and 1:3 respectively, and then the product with different ratios Add it into the soil at the dosage of 5%, 15%, 20% and 25%, and shape the sample according to the optimum moisture content of the plain soil. The appearance of the sample is the same as that of the sample in Example 1, which is a cylinder with a diameter and a height of 100 mm. Sodium hydroxide and calcium stearate were not spiked in this test.

[0043] (2) After standard curing for 7 days, dry it, then seal it with wax around it, stick a glass block on its upper end, place the sample in water, and use a dial gauge to test its volume change in water. The experimental process refers to the GB / T50082-2009 standard.

[0044] (3) Since the sides are sealed with wax, water mainly enters through the upper and lower end faces, and the volume changes of 1d, 3d,...

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Abstract

The invention discloses a soil curing agent based on desulfurized fly ash activity and a preparation method and application of the soil curing agent. The preparation method comprises the steps of performing chemical analysis or fluorescence analysis to obtain components of desulfurized fly ash and superfine slag powder characteristic substances, focusing on testing the content of sulfur trioxide in the desulfurized fly ash, and converting the content into the content of calcium sulfate; testing the content of aluminum oxide in the superfine slag powder; controlling calcium sulfate in the desulfurized fly ash and aluminum oxide in the superfine slag powder according to the classic structure 3CaO.Al2O3.3CaSO4.32H2O, of the ettringite molecule, wherein the mole ratio of calcium sulfate to aluminum oxide is no greater than 3:1; uniformly mixing the desulfurized fly ash and the superfine slag powder according to a pre-estimated ratio, and adding alkali excitant sodium hydroxide and zinc stearate, thereby preparing the novel soil curing agent. The activity of desulfurized fly ash is utilized, and meanwhile, the problem that the volume of the desulfurized fly ash is not stable is solved. The curing effect of the soil curing agent is better than that of a coal ash-lime stable roadbed material and is equivalent to that of a cement stable roadbed material, and the price is only 1 / 3 to 1 / 2 of that of the cement stable roadbed material.

Description

technical field [0001] The invention relates to a new type of soil solidifying agent, which utilizes the latent activity of the new solid waste of the power plant - desulfurization ash, and forms a certain gelling performance under the action of slag micropowder, which is used for roadbed materials (plain soil, graded crushed stone) curing process. It belongs to the cross-technical field of civil engineering materials and traffic engineering. Background technique [0002] In the process of power plant tail gas discharge, calcium oxide powder is used to absorb sulfur in the tail gas to form desulfurization ash. It is a new type of solid industrial waste. Its calcium oxide content and sulfur trioxide content are much higher than ordinary fly ash materials. Generally, it is calcined and turned into desulfurized gypsum for use. If the desulfurization ash is used directly, there is a risk of volume instability and it is difficult to use it directly. At the same time, due to ...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B7/32E02D3/12
Inventor 陈春潘钢华
Owner SOUTHEAST UNIV
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