A kind of cement with high magnesium slag content

Abstract

The invention discloses high magnesium slag doped cement. The raw materials of the cement comprise the following main minerals in percentage by weight: 65-82% of limestone, 1-20% of magnesium slag, 5.5-9.4% of sandstone and 4-8% of coal gangue, wherein the magnesium slag comprises the following main chemical components: less than or equal to 55% and greater than or equal to 50% of CaO, greater than or equal to 20% and less than or equal to 30% of SiO2, greater than or equal to 8% and less than or equal to 12% of MgO, greater than or equal to 4% and less than or equal to 6% of Fe2O3, and greater than 0% and less than or equal to 2% of Al2O3. The cement is prepared by sequentially passing blended raw materials through a raw material drying mill, a raw material homogenizing silo, a decomposing furnace and a rotary kiln, blending the prepared clinker with coal ash, desulfurization gypsum and slag, and feeding the above materials into a cement mill. As high as 20% of magnesium slag is doped into the high magnesium slag doped cement, so that not only is the service life of a limestone mine prolonged, but also industrial wastes such as greatly piled magnesium slag are effectively utilized, the burnability of the clinker is also improved, the content of f-CaO in the clinker is reduced, and the national standard is met.

Description

technical field [0001] The invention relates to a building material, in particular to a cement with high magnesium slag content. Background technique [0002] Cement is an indispensable engineering basic material in construction projects. With the acceleration of my country's industrialization and urban-rural integration, the demand for cement will increase for a long period of time. It is estimated that around 2015, my country's cement demand will reach 1.9-2.3 billion tons, and the consumption of limestone, the main raw material, will reach 1.16-1.41 billion tons. In addition, limestone is also consumed in metallurgical solvents, building stones, pharmaceutical and chemical production, etc. In the long run, it will pose a threat to the reserves of limestone in our country. Therefore, our country encourages enterprises to use industrial waste slag (such as: smelting slag, coal gangue, fly ash, etc.) 2 、Al 2 o 3 and Fe 2 o 3 , and these ingredients are necessary for cem...

AI Technical Summary

Problems solved by technology

[0004] (1) Magnesium slag itself is powdery, and after water quenching, the moisture entering the factory is about 15%. After entering the mill, the output of the raw material mill will be slightly reduced due to the high comprehensive moisture of the material

[0005] (2) During the process of feeding and transferring magnesium slag, it is easy to adhere to the belt conveying equipment, resulting in poor feeding and blockage

[0006] (3) The proportion of magnesium slag replacing limestone is not high, most of which are less than 12%, and there is no obvious improvement in the situation of massive accumulation of magnesium slag waste and urgent limestone reserves

[0007] (4) When calcining clinker with magnesium slag, it is easy to have adverse effects such as rings and balls in the rotary kiln

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