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A kind of low temperature magnesium oxychloride cement and preparation method thereof

A magnesium oxychloride cement and low-temperature technology, which is applied in the field of improvement of magnesium oxychloride cement, can solve problems affecting the structure and volume stability of magnesium cement hydration products, so as to avoid excessive mud temperature, reduce exothermic temperature, and prolong the time Effect

Active Publication Date: 2017-09-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

However, the hydration reaction of magnesium cement is an exothermic reaction process, and a large amount of heat will be generated during the hydration process, which can make the temperature of the cement slurry higher than 100 ° C in a short period of time. Such high temperature will affect the magnesium Structural Volume Stability of Cement Hydration Products

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  • A kind of low temperature magnesium oxychloride cement and preparation method thereof
  • A kind of low temperature magnesium oxychloride cement and preparation method thereof

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[0011] A kind of preparation method of low-temperature magnesium oxychloride cement provided by the invention comprises the following steps:

[0012] Step 1: Magnesium oxide, magnesium chloride, and water are mixed to form a slurry according to the material ratio of 3-9:1:11-20. Wherein the ratio of the amount of substances of magnesium oxide, magnesium chloride, and water can be referred to as "cement molar ratio" for short. The ratio of the magnesium oxide, magnesium chloride, and water according to the amount of substances can also preferably be 3-7:1:11-15.

[0013] Among them, magnesia is a kind of active magnesia, which can come from various sources, such as lightly burned powder, caustic powder, salt lake by-products, etc. After obtaining various sources, the content of active magnesia will be tested first.

[0014] Step 2: Add additives to the slurry to form slurry. The mass of the admixture is 0.5 to 2 times the mass of the magnesium oxide; wherein, the admixture is...

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Abstract

The invention relates to the technical field of cement preparation, in particular to a method for preparing low-temperature magnesium oxychloride cement, comprising the following steps: mixing magnesium oxide, magnesium chloride and water according to the material ratio of 3 to 9:1:11 to 20 to form a slurry body; add additives to the slurry to form mud, and maintain the mud for more than 3 days to obtain the low-temperature magnesium oxychloride cement; the mass of the additive is 0.5 to 2 times the mass of the magnesium oxide; wherein , the additive is selected from: sodium tetraborate, tris (hydroxymethyl) aminomethane, tartaric acid, boric acid, ammonium borate, ammonium dihydrogen phosphate, calcium acetate, urea, zinc chloride, chitosan, benzoic acid, three One or more of aluminum chloride and sodium silicate. The low-temperature magnesium oxychloride cement of the invention has low exothermic temperature, stable and uniform exothermic process, and is beneficial to improving the quality of cement products.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to the improvement technology of magnesium oxychloride cement. Background technique [0002] Magnesium oxychloride cement is a kind of rapid hardening, early strength and high strength material invented by French scientist Sorel in 1867. Due to its excellent mechanical properties, it has a wide range of uses. However, the hydration reaction of magnesium cement is an exothermic reaction process, and a large amount of heat will be generated during the hydration process, which can make the temperature of the cement slurry higher than 100 ° C in a short period of time. Such high temperature will affect the magnesium Structural volume stability of cement hydration products. Contents of the invention [0003] For overcoming the deficiencies in the prior art, the object of the present invention is to provide a kind of preparation method of low-temperature magnesium oxychlori...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/32
Inventor 肖学英文静常成功李颖郑卫新安生霞董金美
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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