Preparation method and application of regenerated cement based on high temperature and carbonization coupling

Abstract

The invention discloses a preparation method and application of regenerated cement based on high temperature and carbonization coupling. The method comprises the following steps: grinding cement paste , and after grinding, performing high-temperature carbonization coupling treatment in a powder raising mode in the presence of water and carbon dioxide; after high-temperature carbonization coupling treatment, carrying out drying treatment at high temperature; and after drying treatment, rapidly cooling to 100 DEG C or below, and carrying out secondary grinding to obtain the regenerated cement. The regenerated cement prepared by the invention is helpful for realizing a carbon sequestration effect, can promote resource utilization of construction wastes, and has the advantages of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of recycled cement preparation, in particular to a preparation method and application of recycled cement based on coupling of high temperature and carbonization. Background technique [0002] Construction waste refers to the general designation of muck, waste concrete, waste masonry and other wastes produced by people in the production activities of the construction industry such as demolition, construction, decoration, repair, etc., and is classified according to the composition. Slag, waste concrete blocks, crushed stones, brick and tile fragments, waste mortar, mud, asphalt blocks, waste plastics, waste metal, waste bamboo and wood, etc. At present, the annual output of construction waste accounts for a relatively large proportion of the total amount of urban waste, accounting for about 30% to 40% of the total amount of urban waste. However, most construction waste treatment methods are directly landfille...

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Problems solved by technology

However, the recycled cement obtained by the method mentioned above cannot achieve the performance of ordinary cement, nor can it 100% replace ordinary cement. In addition, this method will increase a lot of carbon emissions due to the high temperature

[0004] The Chinese application publication number is CN101948280A, which discloses a method of using waste concrete to prepare building mortar. Specifically, it discloses that the concrete is calcined at 350°C to 750°C for 5 to 10 hours, and the concrete powder crushed by an Er crusher is added to a ball mill to dry. Grinding, the recycled cement obtained by this method also cannot achieve the performance of ordinary cement, nor can it 100% replace ordinary cement. In addition, due to the high content of calcium oxide, subsequent use will become a hidden danger

[0005] It can be seen that the reclaimed cement prepared by the construction waste recycling method in the prior art has poor performance and cannot completely replace ordinary cement. The temperature required for the preparation process is high, and there are environmental problems.

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