Dihydrate desulfurized water-resistant gypsum heat-insulation mortar, and production method thereof

A technology for thermal insulation mortar and desulfurized gypsum, applied in chemical instruments and methods, sustainable waste treatment, solid waste management, etc., can solve problems such as unstable quality, secondary pollution, high investment, etc., to protect natural gypsum resources and save Effect of land resource and reduction of production cost

Inactive Publication Date: 2011-09-21
SHANGHAI JINMA BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting problems are: high input, low output, and low added value; the second is: secondary pollution, secondary energy consumption; the third is: low product strength, poor water resistance, short operating time, and narrow application range; four. Yes, high cost, unstable quality
[0004] At present, no similar or similar invention patent applications have been found in the search data

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The preparation method of dihydrate desulfurization water-resistant gypsum thermal insulation mortar of the present invention, its steps are:

[0033] 1) Decrease the attached water of dihydrate desulfurization gypsum by less than 15%, and then dry or air-dry;

[0034] 2) Simultaneously mix and stir with active material, excitation material, coagulation accelerator material and superplasticizer in proportion and measure to form composite gelling material.

[0035] 3) Take a certain amount of composite cementitious material, and then mix it with early strength agent, water retention agent, binder, lightweight aggregate, and air-entraining agent in proportion to form thermal insulation mortar.

[0036] 4) According to the amount of water (powder: water) 1:0.72 on site, mix and stir for 5 minutes, let it stand for 3 minutes, and then stir and use.

Embodiment 1

[0038] The raw material ratio of this example is:

[0039] 1. Original dihydrate desulfurization gypsum (dried or air-dried): 67%

[0040] Slag powder (595): 21%

[0041] Cement (42.5): 10.0%

[0042] Calcium oxide (250-350 mesh): 1.0%

[0043] Sodium sulfate: 0.8%

[0044] F10 superplasticizer: 0.29%

[0045] Composite cementitious material is formed.

[0046] 2. Composite cementitious material: 300kg

[0047] Sulphoaluminate cement: 55kg

[0048] Hydroxypropyl methylcellulose: 0.8kg

[0049]Rubber powder 5044N (Wacker): 2.0kg

[0050] Polyvinyl alcohol (2488): 0.21kg

[0051] RN31 air-entraining agent: 0.06kg

[0052] Closed-cell perlite: 170kg

[0053] Test results: water consumption: 1:0.72, flexural strength: 0.5mpa, compressive strength: 0.95mpa, dry density: 465kg / m3, softening coefficient: 0.99, bond strength: 0.58mpa.

[0054] The preparation method of dihydrate desulfurization water-resistant gypsum thermal insulation mortar of the present invention is: ...

Embodiment 2

[0059] The proportioning raw materials of this example are:

[0060] 1. Original dihydrate desulfurization gypsum: 66.0%

[0061] Slag fine powder: 20.0%

[0062] Fly ash: 3.5%

[0063] 42.5 Cement: 8.0%

[0064] Calcium oxide: 2.0%

[0065] Sodium formate: 0.5%

[0066] composite cementitious material

[0067] 2. Composite cementitious material: 350kg

[0068] Sulphoaluminate cement: 50kg

[0069] Hydroxypropyl methylcellulose: 0.8kg

[0070] Polyvinyl alcohol: 0.5kg

[0071] Rubber powder 5044N: 1.5kg

[0072] RN31 air-entraining agent: 0.06kg

[0073] Closed-cell perlite: 160kg

[0074] Test results: water consumption: 1:0.74, flexural strength: 0.35mpa, compressive strength: 0.725mpa, softening coefficient: 0.80, dry density: 490kg / m3, bond strength: 0.59.

[0075] The preparation method is:

[0076] 1) Mix the oven-dried or air-dried dihydrate desulfurized gypsum with slag powder, cement, calcium oxide, fly ash, and calcium formate according to the ratio and ...

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Abstract

The invention relates to a dihydrate desulfurized water-resistant gypsum heat-insulation mortar, and a production method thereof, belonging to the technical field of the comprehensive resource utilization of solid wastes from a thermal power plant. The heat-insulation mortar is composed of the following components: 300-500 kg of a compound cementitious material, 40-60 kg of an early strength agent, 0.5-1.0 kg of a water retaining agent, 2-3.0 kg of an adhesive, 0.01-0.06 kg of an air entraining agent and 120-180 kg of light aggregate, wherein the compound cementitious material is composed of the following components: 65-75% of dihydrate desulfurized gypsum, 20-25% of an active material, 5-15% of an exciting agent, 0.5-2.0% of an coagulation accelerator and 0.2-0.5% of a super plasticizer. The production method comprises the following steps: oven-drying or air-drying dihydrate desulfurized gypsum, and mixing with the active material, exciting agent and coagulation accelerator according to a certain ratio to obtain the compound cementitious material; and mixing the compound cementitious material with the additives including the early strength agent according to a certain ratio. The heat-insulation mortar provided by the invention has the advantages of high strength, high water resistance, low cost and low heat conductivity, and can consume plenty of the solid wastes.

Description

technical field [0001] The invention belongs to the technical fields of industrial solid waste, development of circular economy, turning waste into treasure, and comprehensive utilization of resources. It specifically relates to a kind of desulfurization gypsum, which is the waste produced by limestone-gypsum and wet desulfurization in thermal power plants, without the traditional calcination process, directly through the modification mechanism of active materials and excitation materials, and then adding additional agent, making it a qualitative leap to produce dihydrate desulfurization and water-resistant thermal insulation mortar. The product has high strength, good water resistance, low cost and long operating time, and can be used for indoor and outdoor wall insulation mortar. Background technique [0002] my country is a big thermal power generation country in the world, with an annual SO2 emission of 25 million tons, ranking first in the world. In order to reduce ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14B28B1/00B28C7/00
CPCC04B28/144C04B20/026C04B2103/14Y02W30/91C04B7/02C04B7/32C04B14/24C04B18/08C04B20/0076C04B24/2623C04B40/0028C04B2103/30C04B2103/304C04B2103/46C04B18/141C04B22/064C04B24/223C04B24/26C04B24/383C04B2103/0057C04B22/142C04B24/04
Inventor 马振义
Owner SHANGHAI JINMA BUILDING MATERIALS
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