Production method of low-clinker low-hydration-heat high-grade cement

Abstract

The invention discloses a production method of low-clinker low-hydration-heat high-grade cement. The cement comprises the following components in percentage by mass: 45% of clinker powder and 55% of slag composite powder, and the clinker powder comprises the following components in percentage by mass: 88% of clinker, 6% of stone powder and 6% of desulfurized gypsum. The low-clinker low-hydration-heat high-grade cement is prepared by adopting a production method of respectively grinding and then blending, the quality grade completely reaches the standard of 52.5 cement specified by the nationalstandard, the hydration heat is low, and the later strength is high and is continuously increased. Compared with the grade of 52.5 cement produced by a traditional method, the use amount of clinker can be saved by at least 40%, the production cost is reduced, and a large amount of waste slag, namely blast furnace slag, generated during steel smelting is used, so that the method has important significance in improving the economic benefit, comprehensively utilizing resources, protecting the environment and building a conservation-minded society.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to a production method of high-grade cement with less clinker and lower heat of hydration. Background technique [0002] At present, when most enterprises produce slag portland cement, they adopt the co-grinding process of clinker, slag and gypsum. Since the grindability of slag is poorer than that of clinker, the slag in cement cannot be fully ground, resulting in slag The activity of clinker cannot be brought into full play, which affects the 28-day strength of cement, limits the increase of slag content in cement, increases the clinker content, and the corresponding heat of hydration is also high; if in order to improve the fineness of slag in cement, Not only does the output decrease when the mill is used, but also the clinker powder is over-grinded, that is, the fine powder less than 3um is mostly clinker powder, which eventually leads to rapid initial hydration of c...

AI Technical Summary

Problems solved by technology

[0002] At present, when most enterprises produce slag portland cement, they adopt the co-grinding process of clinker, slag and gypsum. Since the grindability of slag is poorer than that of clinker, the slag in cement cannot be fully ground, resulting in slag The activity of clinker cannot be brought into full play, which affects the 28-day strength of cement, limits the increase of slag content in cement, increases the clinker content, and the corresponding heat of hydration is also high; if in order to improve the fineness of slag in cement, Not only does the output decrease when the mill is used, but also the clinker powder is over-grinded, that is, the fine powder less than 3um is mostly clinker powder, which eventually leads to rapid initial hydration of cement, increased chemical water demand, and high hydration heat. It is beneficial to engineering construction, so we propose a production method of high-grade cement with less clinker and low heat of hydration to solve the above problems

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