Magnesia sulfoaluminate cement composition as well as product and manufacturing method thereof

A technology of magnesia sulphoaluminate and cement composition, which is applied in the field of building materials, can solve problems such as strength attenuation, achieve long service life, improve impermeability, and improve the effect of sulfate erosion resistance

Inactive Publication Date: 2020-11-17
北京水木华宸科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By changing the phase structure of magnesium cement and selecting elements with excellent compatibility and compatibility to form a new crystalline phase, the strength of the magnesium cement phase is continuously attenuated during the transformation to a thermodynamically stable phase with the increase of humidity and the passage of time. question

Method used

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  • Magnesia sulfoaluminate cement composition as well as product and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Making a non-combustible inorganic composite board

[0030] The raw materials used are light-burned magnesia and calcined bauxite. After testing, the light-burned magnesia contains 63% active MgO, and the calcined bauxite contains active Al. 2 o 3 65%, active SiO 2 15%. The proportion of magnesia sulfoaluminate cement screened in the test is as follows: 100 parts of light-burned magnesia, 45 parts of calcined bauxite, 69 parts of magnesium sulfate heptahydrate, 0.7 parts of phosphoric acid, and 76 parts of water. It is also necessary to select a matching glass fiber mesh cloth according to the thickness of the non-combustible inorganic composite board. Make a solution of magnesium sulfate heptahydrate, phosphoric acid and water, and stir it with calcined bauxite and light-burned magnesia to form a clean slurry. After the clean slurry is made, add 30 parts of sawdust and mix it into a slurry in a mill with loosening function, and roll it with the upper and...

Embodiment 2

[0031] Example 2: Making Glass Magnesium Air Duct Board

[0032] The raw materials used are light-burned magnesia and calcined bauxite. After testing, the light-burned magnesia contains 60% active MgO, and the calcined bauxite contains 56% active Al2O3 and 18% active SiO2. The ratio of the magnesia sulfoaluminate cement screened out in the test is as follows: 100 parts of light-burned magnesia, 47 parts of calcined bauxite, 63 parts of magnesium sulfate heptahydrate, 1.5 parts of sodium hexametaphosphate, 60 parts of water share. It is also necessary to use 90-110g glass fiber twisted mesh cloth per square meter and molded polystyrene foam plastic board for heat insulation with a thickness of 20mm. Make a solution of magnesium sulfate heptahydrate, sodium hexametaphosphate and water, and stir it with calcined bauxite to form a clean slurry. After the clean slurry is made, the upper and lower layers of glass fiber twisted mesh cloth are respectively passed through the clean s...

Embodiment 3

[0033] Example 3: Making straw-based panels

[0034]The raw materials used are light-burned magnesia and calcined bauxite. The light-burned magnesia contains 65% active MgO, the calcined bauxite contains 58% active Al2O3 and 16% active SiO2. The ratio of magnesia sulfoaluminate cement screened out in the test is as follows: 100 parts of light-burned magnesia, 50 parts of calcined bauxite, 69 parts of magnesium sulfate heptahydrate, 1.0 part of phosphoric acid, and 77 parts of water. The straw is selected from wheat straw, and the straw with hollow structure is cut open by cutting method and processed into long strips with a length of 20-25mm and a width of 0.8-1.8mm. Make a solution of magnesium sulfate heptahydrate, phosphoric acid and water, and stir it with calcined bauxite and light-burned magnesia to form a clean slurry. After the clean slurry is made, it is mixed with 110 parts of strip-shaped wheat straw in a roller mill with a loosening function to form a semi-dry slu...

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Abstract

The invention relates to a magnesia sulfoaluminate cement composition as well as a product and a manufacturing method thereof. The composition comprises light calcined magnesia, magnesium sulfate heptahydrate, calcined bauxite, phosphoric acid or phosphate and water. The composition and the cement product thereof have the advantages that (1) the cement is high in strength; (2) the alkalinity of the cement is low; (3) the cement can utilize low-grade bauxite, so that effective utilization and reasonable allocation of resources can be realized; (4) the service lifetime of the cement product is long; and (5) the cement can be directly compounded with a fiber material to prepare fiber reinforced magnesia cement products meeting various requirements.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a magnesia sulphoaluminate cement composition, its products and a production method. Background technique [0002] Existing magnesium cement mainly contains magnesium oxychloride cement (US Patent No. 53092, IMPROVED COMPOSITION TO BE USED AS ACEMENT AND AS A PLASTIC MATERIALFOR MOLDING VARIOUS ARTICLES) invented in 1866 by Frenchman S.Sorel and invented in 1870. Magnesium oxysulfide cement (US Patent No. 100945, IMPROVEMENT IN THE MANUFACTURE OF ARTIFICIAL STONE), and magnesium phosphate cement developed by Brook Haven National Laboratory and Argonne National Laboratory of the United States. Magnesium oxychloride cement and magnesium oxysulfide cement are homonuclear basic salt double salts. With the increase of humidity and the passage of time, in the process of transforming to a thermodynamically stable phase, the strength has a tendency to decrease continuously. Mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/04C04B7/32
CPCC04B9/04C04B7/32
Inventor 马新花谌萌席凯原刘斌
Owner 北京水木华宸科技发展有限公司
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