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Fast-setting early strength magnesium phosphate cement without additional retarder

A strong magnesium phosphate and retarder technology, applied in the field of building materials, can solve the problems of poor operability, high cost, high calcination temperature, etc., and achieve the effects of no shrinkage in the later stage, good retarding effect, and high early strength

Active Publication Date: 2014-03-05
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the sources of sintered magnesia and the composition of the ingredients of the above-mentioned magnesium phosphate cement that the main raw material sintered magnesia used in magnesium phosphate cement comes from magnesite, and its calcination temperature is high and energy consumption is high.
In addition, its ingredients also contain two types of inorganic salts - dihydrogen phosphate and borate, etc., which determine its high cost and limit its industrialization and application
Without additional retarders such as borax and boric acid, the setting time of the above-mentioned traditional magnesium phosphate cement is usually within 3 to 5 minutes, which has poor operability and lacks practical application value

Method used

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  • Fast-setting early strength magnesium phosphate cement without additional retarder
  • Fast-setting early strength magnesium phosphate cement without additional retarder
  • Fast-setting early strength magnesium phosphate cement without additional retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The by-product of boron-containing magnesium oxide from salt lake lithium extraction comes from CITIC Guoan Group Corporation. The chemical composition is: MgO content 82.63%, B 2 o 3 Content 4.63%, Na 2 O content 1.24%, Li 2 O content 0.77%, K 2 O content 0.27%, CaO content 0.14%, SiO 2 Content 0.031%, SO 3 Content 0.76%, its main mineral composition is: MgO content 52.25%, Mg 3 B 2 o 6 Content 12.69%, Mg(OH) 2 Content 35.05%.

[0021] The boron-containing magnesium oxide, a by-product of lithium extraction from salt lakes, is calcined at 800°C for 3 hours to obtain sintered magnesia; after mixing 69 parts of sintered magnesia and 31 parts of potassium dihydrogen phosphate, they are ground and passed through a 180-mesh sieve to obtain sintered magnesia. Fast-setting early-strength magnesium phosphate cement with coagulant.

Embodiment 2

[0023] The by-product of boron-containing magnesium oxide from salt lake lithium extraction comes from CITIC Guoan Group Corporation. The chemical composition is: MgO content 82.63%, B 2 o 3 Content 4.63%, Na 2 O content 1.24%, Li 2 O content 0.77%, K 2 O content 0.27%, CaO content 0.14%, SiO 2 Content 0.031%, SO 3 Content 0.76%, its main mineral composition is: MgO content 52.25%, Mg 3 B 2 o 6 Content 12.69%, Mg(OH) 2 Content 35.05%.

[0024] The boron-containing magnesium oxide, a by-product of lithium extraction from salt lakes, is calcined at 1000°C for 3 hours to obtain sintered magnesia; 69 parts of sintered magnesia is mixed with 31 parts of potassium dihydrogen phosphate, ground and passed through a 180-mesh sieve to obtain sintered magnesia without additional retardation fast-setting early-strength magnesium phosphate cement.

[0025] Table 1 is a list of experimental conditions adopted in Examples 3-36.

[0026] The experimental condition data that table 1...

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Abstract

The invention belongs to the technical field of building materials, and in particular discloses a fast-setting early strength magnesium phosphate cement without additional retarder. The fast-setting early strength magnesium phosphate cement without additional retarder comprises the following components by weight: 54-80 parts of sintered magnesium oxide and 20-46 parts of dihydric phosphate. Through calcination at low temperature by the invention, the sintered magnesium oxide raw material with good performance and low price can be prepared, so as to not only solve the problem of ''magnesium harm'' in lithium extraction from saline lake but also provide a new low-cost raw material approach for the production of magnesium phosphate cement. The prepared sintered magnesium oxide contains a small amount of free boron trioxide, which has good delayed coagulation effect on magnesium phosphate cement. The prepared magnesium phosphate cement material has the characteristics of high early strength and no decrease of long-term strength.

Description

【Technical field】 [0001] The invention belongs to the technical field of building materials, in particular to a fast-setting early-strength magnesium phosphate cement without additional retarder. 【Background technique】 [0002] Magnesium phosphate cement is a new type of material between ceramic products and cement. It is usually made of magnesium oxide, soluble phosphate, and retarders such as borax and boric acid, and mineral admixtures in a certain proportion. Pass through under acidic conditions Chemical reaction produces an inorganic gelling material with phosphate as the gelling phase. [0003] Magnesium phosphate cement has the advantages of high early strength, strong adaptability to ambient temperature, small deformation, high bond strength with old concrete, wear resistance, frost resistance, salt freeze resistance and corrosion resistance of steel bars, etc. . [0004] Patent application 200810200921.7 discloses a phosphate rapid repair building material, its co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/02
Inventor 余红发谭永山董金美李颖文静吴成友
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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