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Method for reducing hydration heat release of magnesium oxychloride cement

A magnesium oxychloride cement and heat release technology, which is applied in the field of building materials and can solve the problems of large heat release and limited large-scale application.

Inactive Publication Date: 2015-04-22
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process of magnesium oxychloride cement, it usually has the disadvantage of large heat release, which limits its further large-scale application

Method used

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  • Method for reducing hydration heat release of magnesium oxychloride cement
  • Method for reducing hydration heat release of magnesium oxychloride cement

Examples

Experimental program
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Embodiment 1

[0023] The raw material magnesia comes from lightly burned magnesite powder, that is, the calcined product of magnesite, and the dosage is 150 parts, of which the content of magnesium oxide is 60% to 62%, that is to say, the dosage of raw magnesite is about 90 parts .

[0024] Dissolve about 168 parts of magnesium chloride hexahydrate in about 75 parts of tap water to form an aqueous solution of magnesium chloride, where tap water is the added water, that is, additional water added to the system, and the following unless otherwise specified, all refer to this meaning; Add 150 parts of the above-mentioned magnesite light-burnt powder containing 60% to 62% of magnesium oxide, 1 part of phosphoric acid, and 10 parts of fly ash to it, and mix well to form magnesium oxychloride cement. The above-mentioned parts are parts by mass That is to say, in this magnesium oxychloride cement, the mass ratio of ore-mixed magnesium oxide, magnesium chloride and water is 1.2:1:2, and water refer...

Embodiment 2

[0028] The raw material magnesium oxide is derived from dolomite lightly burned powder (the content of magnesium oxide is about 20% to 27%), that is, the calcined product of dolomite ore, and the consumption is 475 parts. Among them, the dolomite lightly burned powder magnesium oxide content of the present embodiment About 20%, that is, about 95 parts of magnesium oxide.

[0029] Dissolve 101 parts of magnesium chloride hexahydrate in 107 parts of tap water to form a magnesium chloride aqueous solution, and then dissolve 475 parts of the above-mentioned lightly burned dolomite powder, 3 parts of sodium dihydrogen phosphate, and 5 parts of silica fume in the magnesium chloride aqueous solution, and stir to form a chlorine solution. For magnesium oxychloride cement, the above-mentioned parts are all parts by mass; that is to say, in the magnesium oxychloride cement, the mass ratio of ore-doped magnesium oxide, magnesium chloride and water is 2.1:1:3.2, and the source of water her...

Embodiment 3

[0032]The raw material magnesia comes from the calcined product of magnesium slag, a by-product of lithium extraction from salt lakes, and the dosage is 117 parts. This embodiment contains about 60% of the raw material magnesia for cement preparation, that is, about 70 parts of magnesia.

[0033] Dissolve 72 parts of bischofite (that is, magnesium chloride hexahydrate) in 57 parts of tap water to form an aqueous magnesium chloride solution; then dissolve 117 parts of the above-mentioned calcined product, 2 parts of ferrite, and 30 parts of slag in the aqueous magnesium chloride solution, and stir evenly to form For magnesium oxychloride cement, the above-mentioned parts are all parts by mass; that is to say, in the magnesium oxychloride cement, the mass ratio of ore-doped magnesium oxide, magnesium chloride and water is 2.8:1:2.8, and the source of water here is the same as Described in embodiment 1; And the addition of chemical admixture ferrosite is 2% of the total consumptio...

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Abstract

The invention discloses a method for reducing hydration heat release of magnesium oxychloride cement. The method comprises the following steps: mixing ore-mixed magnesium oxide, magnesium chloride, water and a chemical admixture at the mass ratio of (1.2-2.8) to 1 to (2-3.2), so as to form the magnesium oxychloride cement, wherein the ore-mixed magnesium oxide comprises magnesium oxide and a mineral admixture, the mass ratio of the mineral admixture to the ore-mixed magnesium oxide is (1-6) to 20, and the mass ratio of the chemical admixture to the ore-mixed magnesium oxide is (1-3) to 100. According to the method, the chemical admixture and the mineral admixture are doped into a magnesium oxide-magnesium chloride-water ternary material system in the preparation process of the magnesium oxychloride cement, and thus the targets that the hydration heat release of the magnesium oxychloride cement is reduced, the induction period end time and the acceleration period end time are prolonged, meanwhile, the amount of the raw material-magnesium oxide is replaced with addition of the mineral admixture can be achieved; and the cost of the magnesium oxychloride cement can be reduced to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reducing the hydration heat release of magnesium oxychloride cement. Background technique [0002] Magnesium oxychloride cement is an air-hardening gel material invented by French scientist Sorrel, also known as "Sorrel cement" or "magnesium cement". It has the characteristics of grinding, fire prevention, good decorative effect, and resistance to brine corrosion, so it has attracted extensive attention from all over the world. Magnesite products with magnesium cement as the gel material have been widely used in the fields of building materials and wood conservation, and have made important contributions to the country's energy saving, capital saving, and emission reduction. [0003] Magnesium oxychloride cement is an air-hardening gel material made by mixing magnesium oxide, magnesium chloride and water in a certain proportion, and its basic ...

Claims

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Application Information

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IPC IPC(8): C04B9/02C04B9/20
Inventor 文静余红发肖学英李颖董金美常成功郑卫新
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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