Chlorine-free early strength cement grinding aid and preparation method thereof

Abstract

The invention provides a chlorine-free early strength cement grinding aid and a preparation method thereof, and relates to the technical field of cement additives. The grinding aid comprises a reinforcing agent, a dispersant and water, wherein the reinforcing agent is ammonium acetate, and the dispersant is modified alcohol amine. The grinding aid does not contain any chlorine ion, is harmless tohuman body and buildings, can effectively improve the strength and compressive strength of cement, effectively increases the cement output, effectively eliminates the mutual electrostatic attraction between cement particles and forged balls, improves the grinding efficiency of a cement mill and the powder selecting efficiency of a powder selecting machine, thus increases the yield of a cement grinding machine, and reduces the electricity consumption.

Description

technical field [0001] The invention belongs to the technical field of cement admixtures, and in particular relates to a chlorine-free early-strength cement grinding aid and a preparation method thereof. Background technique [0002] my country is a big country of cement production. Cement is a very basic material in the construction industry. It plays a very important role in the development of the national economy. application. The cement production industry consumes a lot of energy, accounting for about one-third of the total energy consumption of the building materials industry. The main process of cement production includes three processes: grinding of raw materials, firing of clinker and grinding of cement clinker . In this process, the energy consumption of grinding is the highest, and the energy loss rate in the grinding process is very high, and the utilization rate is quite low. The energy consumed in the clinker grinding process accounts for at least half of the ...

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Problems solved by technology

[0004] Because powder cement grinding aids need to be added in a relatively high amount, and powder cement grinding aids mostly use industrial pure compound organic salts and inorganic salts as the main raw materials, these compound organic salts or inorganic salts mostly contain calcium chloride, chlorine Chloride such as sodium chloride and sodium sulfate, which will lead to high chloride ion content in the produced cement, which is difficult to meet the new national standard. The addition of grinding aids should not exceed 0.5% of the weight of cement and the chloride ion content in cement should not exceed 0.5%. More than 0.06%, if the content of chloride ion in the cement is too high, it will corrode the steel bar and pollute the environment; if too much sodium sulfate is added, although it is beneficial to the improvement of the early strength of the cement, the alkali content Improvement will lead to insufficient strength in the later stage, surface efflorescence and alkali-aggregate reaction, which will affect the durability of concrete

[0005] At the same time, the existing powder cement grinding aids still have the following deficiencies: the cost of grinding aids is high, the effect of strengthening cement with a large amount of limestone is not obvious, and it contains harmful components such as chloride ions that affect the service life of buildings. The quality of the grinding aid is not stable, and the dosage is often added in excess, which leads to fluctuations in the quality of the cement

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