Circulating fluidized bed fly ash-based composite micro powder and preparation method thereof

Abstract

The invention provides circulating fluidized bed fly ash-based composite micro powder, which is obtained by compounding silicon-aluminum solid waste, stabilized alkaline solid waste and slag micro powder, and the mass ratio of the silicon-aluminum solid waste to the stabilized alkaline solid waste to the slag micro powder is (1-3): 1: (2-5). Wherein the silicon-aluminum solid waste is one or a combination of more than two of circulating fluidized bed fly ash, coal cinder, steel slag, silica fume and glass powder. Based on the alkali excitation principle, synergistic utilization and advantage complementation of the silicon-aluminum solid waste and the alkaline solid waste can be achieved, the prepared composite micro powder meets the index requirement of S95-grade mineral powder and can be applied to cement admixtures, the production cost of the composite micro powder is saved, and pollution of the solid waste to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste, in particular to a circulating fluidized bed fly ash based composite micro powder and a preparation method thereof. Background technology [0002] With the increasing degree of urbanization in China, people's demand for housing and transportation makes the construction scale increase continuously. As an indispensable building material, the demand for cement is very huge. The production of ordinary cement mainly takes limestone and clay as the main raw materials and forms cement clinker through high-temperature calcination, but a large amount of CO will be discharged in the process of clinker production 2 (accounting for about 14% of China's carbon emissions). Using solid wastes such as circulating fluidized bed fly ash in the field of building materials is an effective way to partially replace cement. Each ton of cement clinker replaced by solid wastes can reduce...

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Problems solved by technology

[0007] From the above improved technologies, it can be seen that whether it is the modification of the circulating fluidized bed fly ash or the chemical regulation by adding substances such as triethanolamine acetate, it will complicate the recycling process of the circulating fluidized bed fly ash and increase the cost of reuse, the market potential for such improvement is not great

[0008] In order to solve the problem of high reuse cost of the existing technology, the inventor classified various solid wastes such as circulating fluidized bed fly ash, mainly into alkaline solid waste and silicon-aluminum solid waste, based on the principle of alkali excitation Guidance, synergistic utilization of two types of solid waste, complementary advantages, to obtain circulating fluidized bed fly ash-based composite micropowder that meets the S95 grade mineral powder index

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