Quick hardening early strength phosphorous slag-based cementitious material and prepartion method therefor

Abstract

The invention provides a quick hardening early strength phosphorous slag-based cementitious material which is composed of granular electric furnace phosphorus slag, graphite tailings, cement clinker, phosphogypsum, aluminum sulfate and an alkali component, wherein the alkali component is prepared by mixing sodium silicate and sodium hydroxide. A preparation method for the quick hardening early strength phosphorous slag-based cementitious material comprises: grinding the granular electric furnace phosphorus slag, the graphite tailings and the cement clinker, respectively: grinding the granular electric furnace phosphorus slag till the specific surface area of the granular electric furnace phosphorus slag is 450-510 m2 / kg, grinding the graphite tailings till the specific surface area of the graphite tailings is 410-460 m2 / kg and grinding the cement clinker till the specific surface area of the cement clinker is 370-420 m2 / kg; and then uniformly mixing the ground granular electric furnace phosphorus slag, graphite tailings and cement clinker respectively with other components, namely phosphogypsum, aluminum sulfate and alkali component in a mass ratio. The cementitious material is the phosphorous slag-based cementitious material which has the characteristics of quick hardening and early strength and the setting time, the safety and the mechanical properties of the cementitious material meet the requirement of GB175-2007 on P.O42.5R common silicate cement. According to the quick hardening early strength phosphorous slag-based cementitious material provided by the invention, high-efficient utilization of phosphorus slag and graphite tailings can be further promoted, the resources and energy resources are saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of building materials, and belongs to an inorganic gelling material with the characteristics of rapid hardening and early strength, in particular to a rapid hardening and early strength phosphorus slag-based gelling material and a preparation method thereof. Background technique [0002] Due to the large resource and energy consumption, serious environmental pollution, and some performance defects in the production process, Portland cement is facing the challenge of sustainable development. Alkali cementing material is a cementing material different from Portland cement and aluminate cement researched and developed by former Soviet scholars since 1957. It not only has rich sources of raw materials, but also can use many industrial waste residues to save energy and reduce waste. Environmental pollution, and has many properties superior to Portland cement, so it is regarded as an energy-saving and environmentally friend...

AI Technical Summary

Problems solved by technology

However, research data show that the current alkali cementitious materials still have the following deficiencies: First, the shrinkage rate of the hardened body is large, which is due to the fact that the gel product content in the hydration product is higher than that in the Portland cement hydration product. The content of the product; the second is the early strength of the alkali cemented material, especially the low flexural strength, which is not conducive to the realization of rapid hardening and early strength; the third is that in the alkali cemented material, phosphorus slag is usually cooked with slag or Portland cement Material (or cement) compatibility, and the amount of slag or clinker is high and the amount of phosphorus slag is low, resulting in high cost, which is not conducive to mass promotion and application

In addition, for waste residues such as graphite tailings, whose emissions have increased rapidly in recent years, there have been no public reports of using them in alkali cementitious materials.

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