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Low-cost heat-resistant magnesium cement and method for preparing building block from same

A magnesium cement, low-cost technology, applied in the field of low-cost heat-resistant magnesium cement and its preparation blocks, can solve the problems of not mentioning the highest service temperature and high-temperature durability, unable to judge the performance, and the floor is not refractory, so as to improve the performance. Fire safety grade, good fire resistance, and the effect of preventing skin peeling

Active Publication Date: 2020-04-10
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Publication No. CN109020426A applies for a new type of magnesia cementitious material and its preparation method for magnesia cementitious material flooring. The physical properties of this product have been improved, which solves the problem that the traditional floor is not fire-resistant, and it is easy to deform, crack and change color when it meets water and heat sources. Disadvantages, installation and maintenance are also simple, and the normal temperature performance is good, but also, the light-burned magnesia powder used is not high-silicon and high-calcium powder calcined with low-grade magnesite. The maximum operating temperature and high-temperature durability, so it is impossible to judge its performance after long-term use at higher temperatures

Method used

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  • Low-cost heat-resistant magnesium cement and method for preparing building block from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A low-cost heat-resistant magnesium cement comprises the following components by weight: 60 parts of light-burned magnesium oxide powder, 26 parts of silica fume, 12.5 parts of magnesium sulfate heptahydrate, 0.3 part of citric acid, 0.5 part of dolomite fine powder, 0.2 Part glass fiber, 0.1 part sodium sulfate, 0.4 part polyamide polyurea resin.

[0031] The method for preparing the experimental block with low-cost heat-resistant magnesium cement of the present invention, the specific operation steps are as follows:

[0032] 1) Raw materials are pre-mixed, weigh the whole formula amount of low-grade ore light-burned magnesia powder, silica fume, magnesium sulfate heptahydrate, dolomite fine powder, heat-resistant fiber and water-repellent agent and put them into the 80 rpm The mixer is used for dry mixing, and the mixing time is 5 minutes;

[0033] 2) Dissolve the admixture, weigh all the modifiers and early strength agents in the formula and put them into the mixer,...

Embodiment 2

[0039]A new low-cost heat-resistant magnesium cement, the raw material composition of the new heat-resistant material is as follows: it is characterized in that it contains the following components by weight: 56 parts of light-burned magnesium oxide powder, 30 parts of silicon, 12.5 parts of magnesium sulfate heptahydrate 0.2 part of oxalic acid, 0.2 part of citric acid, 0.15 part of glass fiber, 0.15 part of sodium sulfate, 0.1 part of ferric chloride, 0.35 part of polyamide polyurea resin, and 0.35 part of dolomite fine powder.

[0040] The method for preparing the experimental block from the low-cost heat-resistant magnesium cement in Example 2 is as in Example 1.

Embodiment 3

[0042] A new type of low-cost heat-resistant magnesium cement. The raw material composition of the new type of heat-resistant material is as follows: it contains the following components by weight: 62.5 parts of light-burned magnesium oxide powder, 26 parts of silica fume, 10 parts of magnesium sulfate heptahydrate, phosphoric acid 0.25 parts, 0.25 parts of oxalic acid, 0.2 parts of polyamine polyamide, 0.1 parts of asbestos, 0.1 parts of glass fiber, 0.1 parts of ferric chloride, 0.5 parts of dolomite fine powder.

[0043] The method for preparing the experimental block from the low-cost heat-resistant magnesium cement in Example 3 is as in Example 1.

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Abstract

The invention relates to the field of constructional cementing materials, particularly to low-cost heat-resistant magnesium cement and a method for preparing a building block. The magnesium cement ischaracterized by comprising the following raw materials by weight: 55-65 parts of light-calcined magnesia powder, 25-35 parts of silica fume, 10-20 parts of magnesium sulfate heptahydrate, 0.1-1 partof fine dolomite powder, 0.1-1 part of a modifier, 0.1-1 part of a water repellent agent, 0.1-1 part of heat-resistant fibers, and 0.1-1 part of an early strength agent, wherein the light calcined magnesia powder is formed by calcining low-grade magnesite at 700-900 DEG C. Compared with the prior art, the beneficial effects of the invention are as follows: the magnesium cement has the advantages of light weight, high strength, no moisture absorption or efflorescence, small corrosion to reinforcing steel bars and the like; the raw material light calcined magnesia powder is prepared through calcining of considerable waste low-grade magnesite which is piled up storage; and since low-grade ore with low price and various industrial wastes are used, the cost of the raw materials of the magnesiumcement is much lower than the cost of regular commercially-available raw materials, the wastes are utilized, and the comprehensive utilization of waste resources is realized.

Description

technical field [0001] The invention relates to the field of building materials and cementitious materials, in particular to a light, high-strength, low-cost heat-resistant magnesium cement and a method for preparing a building block. Background technique [0002] Over the years of blind mining of magnesite, high-grade magnesite is increasingly scarce, and low-grade magnesite is not suitable for the preparation of refractory materials due to its high impurity content, resulting in low added value and unstable quality of low-grade magnesite products , Most of the low-grade magnesite is discarded and pushed into the ravine, or randomly occupied and stacked, resulting in waste of resources, polluting the environment, and is not conducive to the comprehensive utilization of magnesite resources. Under this background condition, carry out efficient separation and extraction and high-value utilization of useful components of magnesite tailings, associated ore, and waste rock, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B111/26C04B111/28C04B111/40
CPCC04B28/30C04B2111/00724C04B2111/00508C04B2111/26C04B2111/28C04B2111/40C04B2111/763C04B2201/52C04B14/304C04B22/14C04B18/146C04B24/06C04B14/26C04B14/42C04B22/147C04B24/287C04B24/04C04B22/12C04B22/165C04B14/40Y02W30/91
Inventor 关岩崔宝栋毕万利孙美硕
Owner UNIV OF SCI & TECH LIAONING
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