Anti-freezing saltpetering-resistant red mud baking-free brick and preparation method thereof

Abstract

The invention relates to an anti-freezing saltpetering-resistant red mud-based baking-free brick and a preparation method thereof. The brick is prepared from the following raw material components: 20to 40 percent of red mud, 10 to 25 percent of power plant coal ash, 5 to 15 percent of electrolytic manganese slag, 20 to 30 percent of metallurgical slag, 5 to 9 percent of 42.5 Portland cement, 20 to 30 percent of graded coal gangue, 3 to 9 percent of excitant, 0.5 to 2 percent of modifier, 0.1 to 0.2 percent of naphthalene water reducer and 3 to 10 percent of composite phase change material microcapsule. The composite phase-change material microcapsule is prepared by taking modified fly ash as a supporting material to adsorb a phase-change material and then coating the phase-change materialwith organic resin. The composite phase change material microcapsules are added, so that the sensitivity of the baking-free brick to the temperature can be effectively reduced, and the expansion andcracking degrees of the baking-free brick in the freezing and thawing process are reduced. Based on the composite synergistic effect theory of various solid waste resources, the volcanic ash activityof solid waste such as power plant coal ash and metallurgical slag is fully excited, a crystalline or amorphous hydration product is formed, the internal pore structure of a matrix can be filled, Na <+> in the matrix is effectively cured, and saltpetering of the baking-free brick is inhibited.

Description

technical field [0001] The invention belongs to the field of resource recycling and the technical field of building materials, and in particular relates to an antifreeze and anti-pan-alkaline red mud-based unburned brick and a preparation method thereof. Background technique [0002] Red mud is a kind of highly alkaline solid waste produced in the process of producing alumina with bauxite as raw material, and its pH value is between 12.1 and 13.0. On average, 1.5-2.0 tons of red mud will be produced for every 1 ton of alumina produced. With the rapid development of the alumina industry, my country's red mud emissions continue to increase. In 2018, my country's red mud discharge was close to 100 million tons, and the accumulated stockpile reached 500 million tons, but its utilization rate was less than 10%. Because red mud contains a large amount of alkaline compounds and heavy metals, it is easy to cause serious environmental problems during the storage process, and using ...

AI Technical Summary

Problems solved by technology

In 2018, the discharge of red mud in my country was close to 100 million tons, and the accumulated stockpile reached 500 million tons, but its utilization rate was less than 10%.

CN108793847A discloses a method that uses red mud and polyaluminum chloride waste residue as the main raw materials, and adds modified arsenic sandstone and other raw materials to produce red mud unburned bricks, and continuously adds sodium hydroxide during the modification of arsenic sandstone. Can lead to high levels of alkaline compounds in unburned bricks, which can cause serious efflorescence problems

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