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Desulfurized ash self-activating and solidifying material

A technology of consolidating materials and desulfurization ash, which is applied in cement production and other directions, can solve the problems of ecological environment damage in power plants and steel mills, and restrict the development of enterprises, and achieve the effects of saving land, saving energy, environmental protection, low cost, and good rigidity

Inactive Publication Date: 2018-09-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For coal-fired thermal power plants and steel mills with a daily output of hundreds of tons of desulfurization ash, if effective and reasonable desulfurization ash treatment methods cannot be adopted, it will not only cause damage to the ecological environment of the power plant steel mill and the surrounding environment, but also cause pollution. The enterprise itself brings huge economic and social burdens, seriously restricting the development of the enterprise

Method used

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  • Desulfurized ash self-activating and solidifying material
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  • Desulfurized ash self-activating and solidifying material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Desulfurization ash self-activation consolidation material strength: Weigh the desulfurization ash and phosphorous slag powder according to the design components in Table 1, carry out the compaction test, and determine the optimum moisture content and maximum dry density of the mixture (see Table 1), The specimens were molded at a controlled degree of compaction and their unconfined compressive strength was determined. The desulfurization ash comes from the sintering plant of the iron and steel enterprise. The unconfined compressive strength test is carried out according to the compaction degree of 95% by changing the content of the desulfurized ash. The specific results of the 7-day, 28-day and 90-day unconfined compressive strength are shown in the table 2 and figure 1 .

[0034] From Table 2 and figure 1 It can be seen from the performance index that when changing the content of desulfurization ash, its strength first increases and then decreases with the increase ...

Embodiment 2

[0036] Water stability of desulfurized ash self-activated consolidation material: On the basis of Example 1, a test piece was molded according to a controlled degree of compaction and a 7-day water stability test was carried out. The desulfurization ash comes from the sintering plant of the iron and steel enterprise, and the unconfined compressive strength test piece is made according to the compaction degree of 95% by changing the content of the desulfurization ash. Experiments were carried out under different water immersion conditions, and the specific results of the 7d unconfined compressive strength measured afterwards are shown in Table 3.

[0037] From the performance indicators in Table 3, it can be seen that within the range of the content of desulfurization ash, the test block did not appear cracking, corrosion and collapse; at the same time, the minimum strength value of 7d water stability can reach 1.49MPa, and the strength can also meet Requirements for filling ma...

Embodiment 3

[0039] Frost resistance of desulfurized ash self-activated consolidation material: On the basis of Examples 1 and 2, a test piece with a size of Φ150mm×150mm was molded according to the controlled compaction degree, and the frost resistance test was carried out. When the specimens were cured to the age of 28 days, five freeze-thaw cycle tests were carried out. Record the mass and height of the specimen after each freeze-thaw, and measure the unconfined compressive strength of the specimen after the freeze-thaw cycle test according to the procedure (see Table 4).

[0040] From the performance indicators in Table 4, it can be seen that after the freeze-thaw cycle test, the unconfined compressive strength of the specimen at 28 days can still reach 1.5MPa and above, but some corner defects appear on the surface of some specimens. It can be seen that the actual application of desulfurization ash self-activation consolidation materials should fully consider the requirements of mater...

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Abstract

The invention relates to a desulfurized ash self-activating and solidifying material which is a self-activating and solidifying material prepared by only taking two kinds of industrial solid waste like desulfurized ash and phosphorus slag powder as raw materials. Potential hydration activity of the phosphorus slag powder and the like is activated through sulfate of the desulfurized ash and own alkalinity to form hydration products like C-S-H, C-S-A-H gel and ettringite, initial strength of the solidifying material is formed, and continuous increase of later strength is ensured; calculated by mass percentage, the desulfurized ash is 88-100%, and the phosphorus slag powder is 0-12%. The material is a cement-free solidifying material. A preparation method of the material includes: stirring the raw materials; transporting the raw materials to a construction site; performing spreading, rolling and moisturizing maintenance to specified age. Industrial solid waste is used, so that land and resources can be saved, cost is lowered, and the material is conducive to environment protection, simple in construction and suitable for filling of civil engineering and building of road bases and subbases having good drainage effect.

Description

technical field [0001] The invention relates to a self-activating consolidation material, in particular to a self-activating consolidation material of a cementless desulfurization ash system. In the whole consolidated material, desulfurization ash and phosphorus slag powder are industrial by-products, which is a kind of consolidation material that utilizes the alkaline component and sulfate component of desulfurization ash to stimulate the potential hydration activity of phosphorus slag powder. In the mixture, the sulfate excitation of the desulfurization ash causes the raw materials to react with each other, forming C-S-H and C-S-A-H gels, and ettringite and other hydration products, which constitute the initial strength of the consolidated body and ensure the continuous growth of the later strength. Background technique [0002] In recent years, China's economy has developed rapidly, and the industry's demand for coal is increasing day by day. Coal combustion usually prod...

Claims

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Application Information

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IPC IPC(8): C04B7/24
CPCC04B7/24Y02P40/10
Inventor 赵青林吴晓欢
Owner WUHAN UNIV OF TECH
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