2results about How to "Effective chelation" patented technology

The invention discloses low-carbon red-mud-based fully-recycled concrete and a preparation method thereof, and relates to the technical field of low-carbon concrete materials. The concrete is prepared from the following raw materials in parts by mass: 50 to 70 parts of modified red mud, 30 to 50 parts of recycled micro powder, 130 to 150 parts of recycled sand serving as a fine aggregate, 280 to 300 parts of recycled coarse aggregate serving as a coarse aggregate, 40 to 50 parts of water, 1 to 3 parts of a multifunctional powder modifier and an alkali activator. The main raw material adopted by the invention is building or industrial solid wastes, the residual alkalinity of the red mud is utilized, the activity of the regenerated micro powder is excited, the dosage of an alkali activator is reduced, and the red mud replaces cement to serve as a cementing material. In addition, building reclaimed sand and recycled coarse aggregate are used as concrete aggregate, so that not only is building waste effectively utilized, but also dependence on natural resources is reduced, and the production cost is reduced. The method has the characteristics of low preparation cost, low carbon and environmental protection, and has good environmental benefits and economic benefits.

The application relates to the technical field of building component boards, and discloses a low-chlorine anti-halogen-returning A1-grade fireproof magnesia board and a forming preparation method thereof, which comprises a magnesia board, a protective layer, a composite layer, a base plate and a supporting assembly. By adopting low-chlorine magnesium chloride and combining the synergistic effect of the composite anti-halogen-returning modifier, the content of chloride ions in the magnesia board can be controlled to be low, free chloride ions and magnesium ions can be effectively chelated, and the pores in the board can be effectively blocked, so that the halogen-returning phenomenon can be inhibited from the root, the problem that the existing magnesia board appears the halogen-returning phenomenon is solved, the fireproof reinforcing agent is matched with aluminum hydroxide, expanded vermiculite and nano silicon dioxide, the synergistic effect with high-activity magnesium oxide can make the board of the magnesia board reach the A1-grade non-combustibility requirement, the nano silicon dioxide fills the pores, the reinforcing effect of the reinforcing fiber is combined, the bending and compressive strengths of the board are improved, and the problem that the existing low-chlorine magnesia board has insufficient mechanical properties is solved.