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Method for reducing heat release during hydration 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 restricting large-scale application and large heat release.

Inactive Publication Date: 2015-04-01
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 heat release during hydration of magnesium oxychloride cement

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Embodiment 1

[0021] The raw material magnesium oxide is derived from lightly burned magnesite powder, that is, the calcined product of magnesite, and the dosage is about 164 parts. In this embodiment, the content of magnesium oxide is 60% to 62%, that is to say, the raw material magnesium oxide The dosage is about 100 parts.

[0022] Dissolve about 168 parts of magnesium chloride hexahydrate in about 134 parts of tap water to form an aqueous solution of magnesium chloride, where the tap water is the added water, that is, the water added to the system, and the following unless otherwise specified, all refer to this meaning; Add the above-mentioned 164 parts of magnesite light-burnt powder and 1 part of phosphoric acid containing 60% to 62% of the above-mentioned magnesium oxide therein, and form magnesium oxychloride cement after mixing evenly, and the above-mentioned parts are all parts by mass; that is to say, In this magnesium oxychloride cement, the mass ratio of magnesium oxide, magnes...

Embodiment 2

[0026] The raw material magnesium oxide is derived from dolomite lightly burned powder (the content of magnesium oxide is about 20% to 28%), that is, the calcined product of dolomite ore, and the dosage is about 364 parts. Among them, the dolomite lightly burned powder magnesium oxide in this embodiment The content is about 27% to 28%, that is, about 100 parts of magnesium oxide.

[0027] Dissolve 72 parts of magnesium chloride hexahydrate in 77 parts of tap water to form an aqueous magnesium chloride solution, then dissolve 364 parts of the above-mentioned dolomite lightly burned powder and 2 parts of ferroin in the aqueous magnesium chloride solution, and stir to form magnesium oxychloride cement. All are parts by mass; that is to say, in this magnesium oxychloride cement, the mass ratio of magnesium oxide, magnesium chloride and water is 2.8:1:3.2, and the source of water here is described in embodiment 1; And chemical addition The addition amount of agent iron vitriol is 2...

Embodiment 3

[0030] The raw material magnesia comes from the calcined product of magnesium slag, a by-product of lithium extraction in salt lakes, and the dosage is 125 parts. This example contains about 80% of the raw material magnesia for cement preparation, that is, about 100 parts of magnesia.

[0031] Dissolve 101 parts of bischofite (that is, magnesium chloride hexahydrate) in 45 parts of tap water to form an aqueous magnesium chloride solution; then dissolve 125 parts of the above-mentioned calcined product and 3 parts of citric acid in the aqueous magnesium chloride solution, and stir evenly to form magnesium oxychloride cement , the above-mentioned parts are all parts by mass; that is to say, in this magnesium oxychloride cement, the mass ratio of magnesium oxide, magnesium chloride and water is 2.1:1:2.8, and the source of water here is the same as described in Example 1 ; And the amount of chemical admixture citric acid is 3% of the amount of magnesium oxide.

[0032] The hydrat...

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Abstract

The invention discloses a method for reducing heat release during hydration of magnesium oxychloride cement. The method for reducing heat release during hydration of magnesium oxychloride cement comprises the following steps: uniformly mixing magnesium oxide, magnesium chloride, water and a chemical additive to form magnesium oxychloride cement, wherein mass ratio of magnesium oxide to magnesium chloride to water is (1.2-2.8):1:(2-3.2), and mass ratio of chemical additive to magnesium chloride is (1-3):100. The method for reducing heat release during hydration of magnesium oxychloride cement has the advantages that the chemical additive is doped in a magnesium oxide-magnesium chloride-water ternary raw material system, and the aims of reducing heat release during hydration of magnesium oxychloride cement and prolonging ending time of an induction period and ending time of an acceleration period are achieved.

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): C04B9/02
Inventor 文静董金美余红发肖学英李颖常成功郑卫新
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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