Composite powder for multi-component waste residue coupling quality improvement as well as preparation method and application of composite powder

Abstract

The invention discloses composite powder for multi-component waste residue coupling quality improvement and a preparation method and application thereof, and the composite powder comprises the following components: nanoscale CaCO3 or carbonated steel slag or carbonated waste concrete, blast furnace slag, coal-fired slag, LF furnace refining slag and desulfurized gypsum. According to the invention, nano-scale CaCO3 particles generated by a carbonation technology are utilized, a new way is developed for the utilization of solid waste carbonation products according to the strong coupling effect among the waste residues, the problem that solid wastes such as LF furnace refining slag and power plant coal-fired slag are difficult to utilize is solved, and meanwhile, the performance of building materials such as cement and concrete is also improved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of metallurgical solid waste, and in particular relates to a composite powder coupled with multi-component waste slag and improved quality, and a preparation method and application thereof. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Building materials such as cement generally have high compressive strength and low flexural strength, and the ratio of compressive strength to flexural strength is generally 3-6. Therefore, when cement and concrete are used in important structural parts, they will be reinforced by adding steel or steel. Fiber and other materials improve the flexural strength of cement structure, so improving the flexural strength of cement is one of the application requirements of cement performance. [0004] LF furnace refining slag is a b...

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Problems solved by technology

[0004] LF furnace refining slag is a by-product produced by adding active lime, bauxite and silica to molten steel during the LF furnace refining process. 2 S to γ-C 2 The crystal transformation of S has a volume expansion of 12%, and there is a certain self-cracking characteristic, which limits its use in the field of building materials, resulting in a large amount of LF furnace refining slag being piled up, causing soil alkalization, and polluting groundwater resources.

[0005] In addition, the amount of slag produced by coal-fired power generation is relatively large, and the slag is currently mainly used in road construction and other aspects, and has not been comprehensively utilized for high value

[0006] The current direct carbonation technology and indirect carbonation technology only focus on carbonation itself, but lack of attention to the influence of carbonation products on the overall hydration performance of composite cementitious materials

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