Water-tolerant desulfured dihydrate stuccogypsum for bottom layer and production method thereof

A technology for plastering plaster and production methods, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of undiscovered invention patent applications, short operation time, low product strength, etc., and achieve operability Long time, good softening coefficient, effect of reducing pollution

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 problems brought about are: first: large investment in equipment and workshops, and complicated process; second: causing secondary energy consumption and secondary pollution; third: low product streng

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] The preparation method of the dihydrate desulfurization and water-resistant bottom plaster plaster of the present invention is:

[0030] 1) The dihydrate desulfurized gypsum is aged for about 15 days to reduce the attached water content to below 15%, and then dried or air-dried.

[0031] 2) At the same time, it is mixed with active material slag powder (595), grade II fly ash, activator 42.5 cement, calcium oxide (250-350 mesh), and coagulant sodium sulfate or calcium formate to form a dry powder.

[0032] 3) Take 40-60% of the above dry powder mixture, and early strength agent: sulfoaluminate cement, water retention agent: hydroxypropyl methyl cellulose ether (40,000), binder: polyvinyl alcohol (2488), Fine aggregate: a product made by mixing river sand.

[0033] 4) Mix with water on site, water consumption (powder: water): 1:0.176, stir for 5 minutes, let stand for 3 minutes, and then stir for use.

Example Embodiment

[0034] Example one:

[0035] The raw material ratio of this example is:

[0036] 1. Original dihydrate desulfurized gypsum (drying or air-drying): 65%

[0037] Slag powder (595): 23%

[0038] Fly ash (Class II): 1.5%

[0039] Cement (42.5): 8.0%

[0040] Calcium oxide (250-350 mesh): 1.5%

[0041] Sodium sulfate: 1.0%

[0042] 2. Upper formula mixture: 40%

[0043] Sulphoaluminate cement: 12%

[0044] Hydroxypropyl methyl cellulose ether (40,000): 0.08%

[0045] Polyvinyl alcohol (2488): 0.2%

[0046] River sand (fineness modulus 2.4): 58%

[0047] The production method is as follows:

[0048] 1) The undisturbed dihydrate desulfurized gypsum is aged to make it contain less than 15% of attached water, and then dried or air-dried;

[0049] 2) Then it is mixed with 595 slag powder, class II fly ash active material, 300 mesh calcium oxide, 42.5 cement stimulating material, and sodium sulfate accelerating material according to the ratio and metering, namely composite cementing material, also known as ...

Example Embodiment

[0052] Embodiment two:

[0053] The raw material ratio of this example is:

[0054] 1. Original dihydrate desulfurized gypsum: 70%

[0055] Active slag powder: 22.5%

[0056] Cement: 6.0%

[0057] Calcium oxide: 1.0%

[0058] Sodium sulfate: 0.5%

[0059] 2. Upper formula mixture: 45%

[0060] Sulphoaluminate cement: 8.0%

[0061] Hydroxypropyl methyl cellulose ether: 0.1%

[0062] Polyvinyl alcohol: 0.3%

[0063] Medium coarse river sand: 47%

[0064] The production method includes the following steps:

[0065] The dried or air-dried dihydrate desulfurized gypsum is mixed with slag powder, calcium oxide, cement, and sodium sulfate according to the proportion and measured to form a dry powder, which is 45%, and then mixed with sulfoaluminate cement, hydroxypropyl methylcellulose, Polyvinyl alcohol and medium-coarse river sand are also mixed according to the proportion, metering and mixing to make finished products. When using, add water to powder: water = 1:0.176, stir for 5 minutes, let it s...

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Abstract

The invention provides water-tolerant desulfured dihydrate stucco gypsum for a bottom layer and a production method thereof. The gypsum is a solid waste material which is generated by a thermal power plant, belonging to the technical fields of developing recycling economy, turning waste to wealth and achieving comprehensive resource utilization. The gypsum comprises the following components by weight percent: 65-75% of raw desulfured dihydrate gypsum, 20-25% of activated material, 5-15% of excitant, 0.5-2% of coagulant, 5-15% of early strength agent, 0.01-0.15% of water-retaining agent, 0.1-0.2% of binder and 40-60% of fine aggregate. The preparation method comprises the following steps: mixing oven-dried or air-dried desulfured dihydrate gypsum with the activated agent, the coagulant and the excitation material to obtain dried powder; and mixing 40-60% of the dried powder with the water-retaining agent and the like in a proportion. The gypsum has the advantages of high strength, good water tolerance, low cost and long operable time. A large amount of desulfured gypsum can be consumed, and secondary investment, secondary energy consumption and secondary pollution are reduced; and economic benefits, social benefits, ecological benefits and environment-friendly benefits are substantial.

Description

technical field [0001] The invention belongs to the technical field of industrial solid waste and resource comprehensive utilization. It specifically relates to a method of improving the desulfurization gypsum, which is the solid waste produced by wet desulfurization of limestone in thermal power plants, gypsum, without drying, calcining, grinding and other traditional processes, and using the excitation principle of active materials and excitation materials. properties, and add necessary admixtures to produce dihydrate desulfurization and water-resistant bottom plaster plaster. Background technique [0002] my country is a big thermal power generation country, with an annual SO2 emission of 25 million tons, ranking first in the world. In order to reduce air pollution, the country has adopted mandatory desulfurization measures. In 2010, the emission of desulfurized gypsum was approximately 50 million tons. And now the utilization rate is less than 10%, the situation is ve...

Claims

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Application Information

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