Manufacturing method of high-calcium solid sulfur ash aerated concrete building blocks

Abstract

The invention discloses a manufacturing method of high-calcium solid sulfur ash aerated concrete building blocks. According to the invention, 40-70 parts of high-calcium solid sulfur ash, 20-40 parts of fly ash, 5-12 parts of cement, 0.1-15 parts of a silicon material, 10-20 parts of lime, 0.1-2 parts of gypsum, and 0.06-0.1 parts of aluminum powder are adopted as raw materials; high-calcium solid sulfur ash, fly ash, the silicon material, and gypsum are added into a mixer; water is added to the mixer, and stirring is carried out, such that a slurry is obtained; aluminum powder, lime, and cement are added to the slurry, and the mixture is well mixed by stirring, such that a casting slurry is obtained; the casting slurry is cast into a mold, and standing and preventive maintenance are carried out; when preventive maintenance is finished, building blocks are obtained by cutting; and the building blocks are subjected to autoclaved maintenance in an autoclave, such that finished products are obtained. With the method provided by the invention, the manufactured product can hardly crack and deform, and has advantages of high compressive strength and after-freeze strength. The method provided by the invention has the advantages of simple technical process, high high-calcium solid sulfur ash utilization amount, low manufacturing cost, convenient construction, and the like.

Description

technical field [0001] The invention relates to a method for manufacturing a high-calcium-sulfur-fixed ash aerated concrete block, and belongs to the technical field of building material manufacturing. Background technique [0002] High-calcium sulfur-fixed ash is the fly ash discharged from the furnace combustion desulfurization process using circulating fluidized bed combustion. With the rapid development of science and technology, people's awareness of energy conservation and environmental protection is constantly increasing, and energy conservation and environmental protection have become major themes of today's social development. Circulating fluidized bed combustion technology is a new coal-fired technology that can burn various low-quality fuels, such as high-sulfur and high-ash coal, coal gangue, peat, tailings, slag, etc. This technology is one of the advanced technologies for clean coal combustion and sustainable development strategy. It integrates the advantages...

AI Technical Summary

Problems solved by technology

Due to high calcium sulfur-fixing ash requires a lot of water, has a large self-hardening property, condenses too quickly, and is easy to block pipes, so when reaching the same consistency, it needs to increase the amount by about 50% compared with the normal amount, resulting in low product strength and low sulfur-fixing ash content. The fluctuation is large, and the process control is difficult; in addition, the content of free calcium oxide and sulfur trioxide in high-calcium sulfur-fixing ash seriously exceeds the technical requirements of fly ash for silicate products, so it is necessary to mix it when the raw materials are unqualified. Quantity control makes its comprehensive utilization very difficult

At present, the utilization of high-calcium sulfur-fixing ash mainly focuses on the production of sulphoaluminate cement, cement admixture, molecular sieve, soil conditioner, autoclaved brick, etc. There are also reports of its use in aerated concrete, but the solid The content of f-CaO in sulfur ash is 1% to 3.6%, the content of SO 3 is 3% to 7%, and the product is easy to crack and deform, and its compressive strength and strength after freezing are relatively low, reaching It does not meet the requirements of China's national standard GB11968-2006 "Autoclaved Aerated Concrete Blocks", so the existing method of using high calcium and sulfur-fixed ash to make aerated concrete blocks is not ideal and has not been widely used yet.

Images