Carbon dioxide carbonized regenerated water permeable brick and preparation process thereof

Abstract

The invention belongs to the field of solid waste resource reutilization of civil environmental engineering, and particularly relates to a carbon dioxide carbonized regenerated water permeable brick and a preparation process thereof. Solid-phase components of the recycled water permeable brick are mixed according to the mass percent, the solid-phase components comprise 20%-30% of fine-grained ash,5%-10% of bottom mud, 25%-35% of recycled aggregate, 0.5%-2.0% of fiber, 15%-30% of waste glass powder and 15%-35% of alkaline materials, and the mass ratio of waste is 70% or above. According to theinvention, the regenerated water permeable brick with high strength and good crack resistance is formed by uniformly stirring all the components, conducting forming with a brick mold and carrying outvibration pressing and sequentially carrying out conventional curing, steam curing and carbonization curing, and the mechanical property and the water permeability of the brick body are far superiorto those of a brick body subjected to independent curing, steam curing or carbonization curing; and in addition, a large amount of carbon dioxide gas is adsorbed in the process, and greenhouse benefits can be reduced. The method overcomes the problems of low comprehensive utilization rate of solid wastes, shortage of traditional brick making raw materials, low efficiency, long period, poor environmental benefits and the like, and has remarkable environmental benefits, social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the field of resource recycling of solid waste in civil environmental engineering, and in particular relates to a regenerated permeable brick carbonized with carbon dioxide and a preparation process thereof. Background technique [0002] With the development of urbanization, a large number of old structures have been demolished, and the waste construction waste generated, such as clay bricks, has been transported to the suburbs or villages, some of which are directly used for road embankment filling, and some are piled in the open air or landfilled. Realize the resource utilization of construction waste. These disposal methods not only occupy a large amount of land, but also leave a large amount of dust and dust in the process of clearing, transporting and stacking, causing huge pressure on society and the environment. In addition, although most of the bricks currently used have good compressive strength, they do not have wate...

AI Technical Summary

Problems solved by technology

High-temperature kiln firing usually consumes a lot of clay, carbon, energy and long firing time, and also produces environmental pollution

For example, the invention patent CN 111499348 A discloses "a production process of sintered bricks", but in the process of sludge drying and raw material aging process, malodorous gas will be produced, and it can also produce harmful gases to people or people when the brick body is fired in the kiln. Dioxin is harmful to animals, and the environment for making bricks is not friendly; this method uses the energy of cinders and adds wood chips to make the bricks continue to sinter at 950°C to 1000°C for 3 days, which will consume a lot of wood

Invention patent CN 111484263 A discloses a method of "a method for preparing new type of sintered bricks from construction waste". Although the raw materials are stirred more uniformly and the quality of sintered bricks is improved, this method is similar to the above-mentioned invention document CN111499348 A, both of which are made by sintering process. Bricks take a long time to fire and consume a lot of resources, which is not conducive to sustainable development

However, the existing carbonization technology is not perfect, and there are many problems

For example, the invention patent CN 104326736 B discloses "a simple method for preparing magnesia fiber bricks using cotton-containing cloth as a template", but this method requires that the brick-shaped cloth be placed in a tunnel kiln and then heated rapidly to 400-800°C, and then Then slowly raise the temperature to 1100-1600°C and sinter for 0.5-1 hour. This method has high requirements for construction machinery, and high-temperature sintering method will consume a lot of energy.

Another example is the invention patent CN105837143 B which discloses "a preparation method of activated magnesia carbonized blocks". The invention uses cement, gravel, sand and other materials as raw materials. And Portland cement will also directly or indirectly cause environmental pollution

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