Blast furnace flue gas desulfurization building gypsum and preparation method thereof

A technology for desulfurized building gypsum and desulfurized gypsum, which is applied in the field of blast furnace flue gas desulfurized building gypsum and its preparation, can solve the problems of low strength and high water absorption of gypsum blocks, achieve high strength, reduce water absorption, and increase strength

Inactive Publication Date: 2019-01-25
PANZHIHUA UNIV
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the gypsum blocks prepare...
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Method used

In the present invention, take blast furnace flue gas desulfurization gypsum as main raw material, add ordinary portland cement and can improve the flexural strength of building gypsum; Add Xigeda soil and can improve compressive strength; The effect of lime is to reduce water absorption Rate. In order to make the prepared blast furnace flue gas building gypsum blocks have better compressive strength, flexural strength and lower water absorption, it is necessary to control the blast furnace flue gas desulfurization gypsum in blast furnace flue gas : Xigeda...
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Abstract

The invention belongs to the technical field of building gypsum preparation, and particularly relates to blast furnace flue gas desulfurization building gypsum and a preparation method thereof. The technical problems that a gypsum building block prepared from existing flue gas desulfurization building gypsum is low in strength and high in water absorption rate are solved. The invention provides the flue gas desulfurization building gypsum. The flue gas desulfurization building gypsum is prepared from blast furnace flue gas desulfurization gypsum, common silicate cement, xigeda soil and lime inthe weight ratio of 1:(0.1-0.15):0.2:0.2. The invention further provides a preparation method of a building block. The preparation method includes the steps that the raw materials are ground into powder, water is added, the materials are mixed and stirred, the mixture is poured into a mold and naturally maintained after mold forming, and the flue gas desulfurization building gypsum is obtained. The strength of the building block prepared from the blast furnace flue gas desulfurization building gypsum is improved, and the water absorption rate is reduced. According to the blast furnace flue gas desulfurization building gypsum, fly ash is replaced with the xigeda soil, and the cost is greatly reduced.

Technology Topic

GypsumAbsorption rate +5

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  • Blast furnace flue gas desulfurization building gypsum and preparation method thereof

Examples

  • Experimental program(5)

Example Embodiment

[0025] The present invention also provides a method for preparing blast furnace flue gas desulfurization building gypsum, which includes the following steps: grinding blast furnace flue gas desulfurization gypsum, ordinary Portland cement, Xigeda soil, and lime into powders in a weight ratio of 1:0.1-0.15: 0.2:0.2 is mixed.
[0026] The present invention also provides a method for preparing a blast furnace flue gas desulfurization building gypsum block, which includes the following steps: adding water to the blast furnace flue gas desulfurization building gypsum, mixing and stirring, pour into a mold to form a mold, and then natural curing is obtained; the blast furnace smoke The weight ratio of each raw material to water in the gas desulfurization building gypsum is: blast furnace flue gas desulfurization gypsum: ordinary Portland cement: Xigeda soil: lime: water=1:0.1~0.15:0.2:0.2:0.5~0.75.
[0027] Wherein, in the above-mentioned preparation method of blast furnace flue gas desulfurization building gypsum block, the mixing time is controlled within 1 min. Adding a small amount of water to the blast furnace flue gas desulfurization gypsum will quickly condense. If the mixing time is too long, the molding will be affected. The mixing time should be controlled within 1 min. Stir evenly within 1 min, and it will be fluid.
[0028] Wherein, in the preparation method of the above-mentioned blast furnace flue gas desulfurization building gypsum block, the natural curing is to avoid direct sunlight and rain at room temperature.
[0029] The invention also provides a blast furnace flue gas desulfurization building gypsum block, which is prepared by using the above-mentioned preparation method of the blast furnace flue gas desulfurization building gypsum block.
[0030] Wherein, in the above-mentioned blast furnace flue gas desulfurization construction gypsum block, the flexural strength of the blast furnace flue gas desulfurization construction gypsum block after 28 days of natural curing is 4.0-7.7 MPa; the compressive strength is 25-37 MPa; the water absorption rate is 15 ~25%; Flexural strength softening coefficient is 0.37~0.64; Compressive strength softening coefficient is 0.33~0.47. The strength of the gypsum block prepared by the blast furnace flue gas desulfurization building gypsum has a certain degree of improvement, while reducing the water absorption rate.

Example Embodiment

[0034] Example 1
[0035] The blast furnace flue gas desulfurization building gypsum in this embodiment includes the following raw materials: 2000 g of blast furnace flue gas desulfurization gypsum, 300 g of ordinary Portland cement, 400 g of Xigeda soil, and 400 g of lime.
[0036] The preparation method of blast furnace flue gas desulfurization construction gypsum in this embodiment: mix the above-mentioned raw materials uniformly to obtain it.
[0037] The preparation method of the blast furnace flue gas desulfurization building gypsum block in this example: blast furnace flue gas desulfurization gypsum 2000g, ordinary Portland cement 300g, sigeda soil 400g, lime 400g and water 1360g were mixed and stirred for 30s, poured into the mold for 5 minutes After forming a mold and natural curing, a blast furnace flue gas desulfurization building gypsum block is obtained. The obtained blast furnace flue gas desulfurization building gypsum blocks were subjected to natural curing for 28 days and dried in an oven according to (GB/T 9776-2008 "Building Gypsum"), the compressive strength was 27.60MPa; the flexural strength was 7.53MPa The water absorption rate is 15.11%; the flexural strength softening coefficient is 0.64; the compressive strength softening coefficient is 0.42.

Example Embodiment

[0038] Example 2
[0039] The blast furnace flue gas desulfurization building gypsum in this embodiment includes the following raw materials: 2000 g of blast furnace flue gas desulfurization gypsum, 210 g of ordinary Portland cement, 400 g of Xigeda soil, and 400 g of lime.
[0040] The preparation method of blast furnace flue gas desulfurization construction gypsum in this embodiment: mix the above-mentioned raw materials uniformly to obtain it.
[0041] The preparation method of the blast furnace flue gas desulfurization building gypsum block in this example: blast furnace flue gas desulfurization gypsum 2000g, ordinary Portland cement 210g, sigeda soil 400g, lime 400g and water 1500g were mixed and stirred for 45s, poured into the mold for 5 minutes After forming a mold and natural curing, a blast furnace flue gas desulfurization building gypsum block is obtained. The obtained blast furnace flue gas desulfurization building gypsum blocks were subjected to natural curing for 28 days and dried in an oven according to (GB/T9776-2008 "Building Gypsum"), the compressive strength was 30.92MPa; the flexural strength was 5.57MPa; The water absorption rate is 15.44%; the flexural strength softening coefficient is 0.45; the compressive strength softening coefficient is 0.47.

PUM

PropertyMeasurementUnit
Flexural strength4.0 ~ 7.7mPa
Compressive strength25.0 ~ 37.0mPa
Compressive strength27.6mPa

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • high strength
  • low water absorption
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