All-solid-waste-based carbonated unfired lightweight aggregate and preparation method thereof

Abstract

The invention discloses a preparation method of all-solid-waste-based carbonated unfired lightweight aggregate, which comprises the following steps: (1) grinding active component type solid waste, lightweight filling type solid waste and alkali-activated solid waste, and mixing to obtain mixed solid waste powder; and (2) granulating the mixed solid waste powder and water to obtain particles, pre-curing the particles, and then carrying out CO2 mineralization curing to obtain the all-solid-waste-based carbonated unfired lightweight aggregate, wherein the active component type solid waste comprises blast furnace slag, steel slag or furnace slag; the light filling type solid waste comprises fly ash, river mud or red mud; and the alkali-activated solid waste comprises carbide slag. The raw materials are all selected from solid wastes, the alkali-activated solid wastes are used for replacing traditional quick lime, sodium hydroxide, water glass and the like as an alkali activator, and a CO2 mineralization strengthening technology is adopted, so that the carbon sequestration potential of the solid wastes is fully exerted, natural resources are saved, and the all-solid-waste-based carbonated unfired lightweight aggregate with good compressive strength is prepared.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource utilization and building materials, and in particular relates to an all-solid waste-based carbonated burn-free lightweight aggregate and a preparation method thereof. Background technique [0002] my country is the world's largest steel producer and coal consumer, which has brought about a large amount of industrial solid waste such as blast furnace slag and fly ash. However, the proportion of industrial solid waste in my country is low, and a large amount of industrial solid waste is piled up. , not only occupies and destroys land resources, but also pollutes groundwater, causing air pollution such as flying dust, and it is imminent to eliminate solid waste. CCUS (carbon dioxide capture utilization and storage) technology is one of the effective ways to reduce large-scale carbon emissions, CO 2 The mineralization strengthened building material product technology is to use CO 2 A new...

AI Technical Summary

Problems solved by technology

In the above method, the ingredients still contain natural resources, and at the same time, the sintering process is used to aggravate pollution and the greenhouse effect

[0005] The Chinese patent document with the publication number CN102351557B discloses a method for producing unfired ceramsite by combining activated sludge with fly ash. A method for producing lightweight aggregates using steel slag, vitrified microspheres, and quicklime in combination with carbonization technology, the finished product has good performance, but the cost is high; the Chinese patent document with the publication number CN111362607A discloses a light-weight solid waste non-fired pottery Granules, raw materials include steel slag powder, slag powder, Portland cement, activator, density regulator, water, the invention uses hollow glass microspheres as density regulator, which reduces the bulk density of ceramsite products and improves the strength. high production cost

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