A process for producing sintered bricks with ultra-high content of fly ash

Abstract

The invention provides a high efficiency and energy saving fly ash sintered brick making method. The optimization of granularity graduation of shale powder and the introduction of a single layer drying process capable of realizing large-scale continuous production solve the problems of low strength and easy deformation of green bricks in the drying process of ultrahigh-content fly ash sintered bricks, and multi-time mixing, forced mixing, heat insulation time prolongation processes further improve the product stability, so the large-scale industrial production of ultrahigh-content fly ash sintered bricks is successfully realized, the sintered bricks obtained in the invention has high yield, excellent strength and reduced weight, and energy consumed by sintering is effectively reduced. The selection of a kiln top and a hanging structure made of a sintered refractory material improves the acid corrosion resistance of a kiln body, can effectively adapt to the production of high--sulfur high-carbon fly ash sintered bricks, solves the problem of difficult utilization of fly ash from a circulating fluidized bed power plant, and improves the resource utilization rate.

Description

technical field [0001] The invention relates to a production process of sintered bricks for construction, in particular to a process for producing sintered bricks with ultra-high content of fly ash. Background technique [0002] For a long time, the leading product of my country's brick and tile industry has been solid clay bricks. The preparation of clay bricks has problems such as damaging the environment and high coal consumption. However, the annual discharge of fly ash produced by thermal power plants is high, and the accumulation covers an area of ​​more than 1 million mu, causing serious pollution. The use of fly ash and other wastes to make building bricks is the main direction of developing new wall materials for energy saving, land saving, waste utilization, heat preservation and heat insulation. At the same time, as a resource-saving unit, the circulating fluidized bed unit can effectively use energy with low calorific value. used waste. How to use high dosage ...

AI Technical Summary

Problems solved by technology

When using shale powder with this particle size, the amount of fly ash is generally controlled below 25wt%, otherwise it will be difficult to achieve a satisfactory product pass rate and the product strength will be affected. At the same time, due to the low amount of fly ash, the roasting process must More high-quality coal is artificially cast outside, and energy consumption is high

However, when a higher amount of fly ash is used, the wet body of fly ash sintered brick has low strength, large drying shrinkage, and large residual moisture. As a result, under the traditional process conditions, the wet body is easily deformed, cracked, and the strength is low. rate is not high

And under the traditional production conditions, when the fly ash with high sulfur content from the power plant is used, the corrosion damage to the roof of the sintering kiln is great, and the maintenance and maintenance costs of the kiln body are high, which is not suitable for long-term large-scale industrial production

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