Low-heat silicate cement clinker for maritime work and preparation method thereof

Abstract

The invention relates to a preparation method of low-heat silicate cement clinker for maritime work. The preparation method comprises the following steps: (1) mixing and grinding the following components in percentage by mass into powder: 70 to 84 percent of limestone, 10 to 20 percent of clay, 5 to 10 percent of sulfate slag and 1 to 5 percent of iron tailings to obtain a cement raw material; (2) decomposing the cement raw material in a decomposing furnace, then calcining at the temperature of 1,350 to 1,400 DEG C for 30 to 45 min, and cooling to obtain the cement clinker, wherein on the basis of the parameters of the decomposing and calcining production processes of the existing cement raw material of the same yield, the following parameters of the calcining process of the cement raw material are adjusted respectively according to the yield of the cement clinker of 500 to 10,000 t / day: the rotating speed of a high-temperature fan of a kiln is reduced by 3 to 5 percent, the use amount of head coal is reduced by 2 to 5 percent, the use amount of tailings is increased by 2 to 5 percent, the outlet temperature of the decomposing furnace is reduced by 10 to 30 DEG C, the temperature of a C5 discharging pipe is reduced by 2 to 5 percent, and the rotating speed a motor of a grate cooler is increased by 20 to 30 percent. Cement prepared from the cement clinker disclosed by the invention is low in water heat and dry shrinkage rate.

Description

technical field [0001] The invention relates to a Portland cement clinker, in particular to a marine low-heat Portland cement clinker and a preparation method thereof. Background technique [0002] In recent years, countries all over the world have attached great importance to the development of marine resources. In foreign countries, the structural materials used in marine engineering mainly include steel structures and cement concrete structures. In terms of use effects, cement concrete materials are a better structural material. Foreign concrete projects mainly use medium-heat or low-heat Portland cement and add appropriate amount of chemical admixtures and mineral admixtures to make the performance of cement concrete meet the special requirements of marine engineering. Our country is rich in marine resources, and the development and utilization of marine resources has broad prospects. In the future, whether it is offshore, in the sea or under the sea, the structural ma...

AI Technical Summary

Problems solved by technology

At present, ordinary Portland cement and a small amount of sulfate-resistant cement are mainly used in marine projects such as ports and docks in my country. This type of cement has high hydration heat release and high drying shrinkage rate. Its 7d is greater than 300kJ / kg, and 28d dry The shrinkage rate is greater than 0.1, which cannot fully meet the special requirements of marine engineering

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