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Soil stabilizer prepared from phosphogypsum and desulfurized fly ash and using method thereof

A soil curing agent and desulfurization ash technology, which is applied in the field of building materials, can solve the problems of negative impact on concrete performance, poor volume stability, and unsuitable direct use, etc., achieves excellent economic and environmental benefits, saves engineering maintenance costs, and improves Effects of engineering properties

Inactive Publication Date: 2018-08-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desulfurization ash is a by-product of dry desulfurization in coal-fired power plants. It contains part of desulfurization gypsum (mainly composed of CaSO 4 .2H 2 O and CaSO 4 ), the volume stability is not good, and its use as a concrete admixture has a negative impact on the performance of the concrete. It is not suitable for direct use in concrete, and there is a certain amount of storage
The accumulation of these phosphogypsum and desulfurization ash not only takes up a lot of land, but also easily causes environmental pollution, which has attracted more and more attention from the environmental protection department

Method used

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  • Soil stabilizer prepared from phosphogypsum and desulfurized fly ash and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1, a soil curing agent prepared by using phosphogypsum and desulfurized ash and its use method, consisting of 100 phosphogypsum, 10 desulfurized ash, 63 metakaolin, 1 lithiated bentonite, 18 calcined coal gangue powder, 7 lime, silicon Salt cement clinker 5, steel slag powder 1, diatomite 0.5, water glass 0.2, caustic soda 0.1 by mass ratio. According to the mass ratio of 10% mixed with soil, add water and stir evenly, after compaction, the performance test results are shown in Table 1.

Embodiment 2

[0055] Example 2, a soil curing agent prepared by using phosphogypsum and desulfurized ash and its use method, consisting of 100 phosphogypsum, 40 desulfurized ash, 95 metakaolin, 8 lithiated bentonite, 30 calcined coal gangue powder, 20 lime, silicon Salt cement clinker 20, steel slag powder 7, diatomite 2, water glass 3.5, caustic soda 1.5 mass ratio composition. According to the mass ratio of 7%, mixed with soil, add water and stir evenly, after compaction, performance test results are shown in Table 1.

Embodiment 3

[0056] Example 3, a soil curing agent prepared by using phosphogypsum and desulfurized ash and its use method, consisting of 100 phosphogypsum, 25 desulfurized ash, 80 metakaolin, 6 lithiated bentonite, 20 calcined coal gangue powder, 8 lime, silicon Salt cement clinker 13, steel slag powder 6, diatomite 1.3, water glass 3.0, caustic soda 1.4 by mass ratio. According to the mass ratio of 6%, mixed with soil, add water and stir evenly, after compaction, performance test results are shown in Table 1.

[0057] Table 1 Example performance test results

[0058]

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Abstract

The invention relates to the technical field of construction and building materials, and in particular to a soil stabilizer prepared from phosphogypsum and desulfurized fly ash and a using method thereof. The soil stabilizer is prepared from phosphogypsum, desulfurized fly ash, metakaolin, lithiation bentonite, calcined coal gangue, lime, Portland cement clinker, steel slag powder, kieselguhr, water glass and caustic soda. The soil stabilizer can improve the soil structure and the engineering properties, and therefore the service life of a road is prolonged, the engineering project maintenancecost is saved, economic environment benefits are good, and the soil stabilizer is the current ideal option for road materials. The soil stabilizer is applicable to the fields of road foundation stabilization, slope protection, seepage-proofing in hydraulic engineering, rough roads, environmental protection projects, water and soil retention and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a soil curing agent prepared by using phosphogypsum and desulfurized ash and a use method thereof. Background technique [0002] Phosphogypsum is a by-product of sulfuric acid extraction of phosphate rock to produce phosphoric acid, producing 1 ton of phosphoric acid (with 100% P 2 o 5 total) about 5 tons of by-product phosphogypsum. Due to the increasing demand for phosphate compound fertilizers in my country, the amount of phosphogypsum produced in the production process is also increasing, and the accumulation of these phosphogypsum gradually increases the pressure on the environment. Desulfurization ash is a by-product of dry desulfurization in coal-fired power plants. It contains part of desulfurization gypsum (mainly composed of CaSO 4 .2H 2 O and CaSO 4 ), the volume stability is not good, and its use as a concrete admixture has a negative impact on the per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C09K17/12
CPCC04B28/26C04B2111/00732C04B2111/0075C04B2111/00758C04B2111/00767C04B2201/50C09K17/12C09K2103/00C04B18/0445C04B18/062C04B14/106C04B14/104C04B18/023C04B22/064C04B7/02C04B18/142C04B14/08C04B22/062
Inventor 孙振平张世杰冀言亮李嘉伟田俊涛刘恒
Owner TONGJI UNIV
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