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

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...

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

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