Method for producing low heat expansive cement

Abstract

The invention discloses a method for producing low heat expansive cement, which comprises the following steps: 1) preparing the following raw materials according to parts by weight: 2-30 parts of schreyerite slag, 2-30 parts of phosphorus slag, 20-62 parts of pelletizing blast furnace slag, 18-45 parts of cement clinker, 7-15 parts of gypsum or anhydrite and 0.2-5 parts of other additive materials; 2) milling the slag into mineral powder with 0.08mm fineness and screen residue less than 5%; 3) feeding the mineral powder into a mill hoister and feeding the clinker, gypsum or anhydrite and other additive materials prepared in the step 1) into a milling end of a mill; and 4) adjusting a specific surface area of the milled powder product and the proportion of all the materials in the step 1),thereby forming the end product of the low heat expansive cement. The method provided by the invention is simple in technology. In the absence of resources, the present formula of the low heat expansive cement is locally replaced by the schreyerite slag, the phosphorus slag, and the like, for producing the cement, so that the production cost according to the method provided by the invention is lowered.

Description

technical field [0001] The invention relates to the technical field of cement production, in particular to a production method of low-heat micro-expansion cement. Background technique [0002] The hydraulic cementitious material with low heat of hydration and micro-expansion properties made of granulated blast furnace slag as the main component, added with appropriate amount of Portland cement clinker and gypsum, is called low-heat micro-expansion cement. It is mainly suitable for concrete and mass concrete that require low heat of hydration and compensation for shrinkage, and is also suitable for projects that require impermeability and sulfate corrosion resistance. [0003] For example, the publication number is CN1175559, and the publication date is that the Chinese patent literature on March 11, 1998 discloses a low-heat micro-expansion cement whose raw material composition includes cement clinker, granulated blast furnace slag and phosphorus slag, hemihydrate gypsum...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing technologies represented by the above-mentioned patent documents use high-quality granulated blast furnace slag as the main raw material, but because the high-quality slag resources required for the production of low-heat micro-expansion cement are becoming less and less, the price of granulated blast furnace slag is also increasing. The higher the higher, resulting in a corresponding increase in the production cost of cement