Metallurgical slag sintered bricks and preparation method thereof

Abstract

The invention provides metallurgical slag sintered bricks and a preparation method thereof. The preparation method comprises the following steps: mixing metallurgical slag, clay and / or shale and an additive, which meet a preset condition, according to preset proportions; aging the mixture obtained after mixing, and then performing forming to obtain green bricks; and drying the green bricks, and then burning the green bricks in a kiln to obtain the sintered bricks. According to the preparation method provided by the invention, by controlling the preset condition of the metallurgical slag, the clay and the additive can be directly mixed with the metallurgical slag by stirring, and secondary breaking is not needed, so that the energy consumption of the preparation is greatly reduced; the metallurgical slag has a function of reducing the melting point, so that the temperature of a sintering reaction can be reduced; and by controlling factors including the content of ferric oxide in the metallurgical slag, the sintering temperature and the sintering atmosphere, sintered bricks with different colors can be obtained without adding an expensive coloring agent, so that large-scale utilization of the metallurgical slag is achieved, mineral resources are saved, and meanwhile, qualified sintered bricks are produced with low cost, low energy consumption and a high efficiency, thereby achieving comprehensive utilization of resources, and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and in particular relates to a metallurgical slag fired brick and a preparation method thereof. Background technique [0002] In the production process of the metallurgical industry, a large amount of solid waste, namely metallurgical slag, will be produced. For example, in the iron and steel industry, my country produces more than 800 million tons of crude steel per year, and the output of steel slag accounts for 12%-20% of crude steel output; in the aluminum industry, for every 1t of alumina produced, 0.8-1.5t of red mud can be produced, About millions of tons of red mud are generated in my country every year. A large amount of metallurgical slag not only occupies a large amount of valuable land resources, but also seriously pollutes the environment, which directly or indirectly affects people's production and life in many ways. At present, the utiliza...

AI Technical Summary

Problems solved by technology

A large amount of metallurgical slag not only occupies a large amount of valuable land resources, but also seriously pollutes the environment, which has a direct or indirect impact on people's production and life in many ways

At present, the utilization rate of steel slag in my country is less than 30%, and the utilization rate of red mud is only 4%. It is a major issue for metallurgical enterprises and even the whole society to seek an effective way for large-scale and resource utilization of metallurgical slag such as steel slag and red mud.

In addition, this process requires complex processes such as wet grinding and spray granulation, which has high requirements on raw material composition and physical properties, which also limits the application of metallurgical slag in the field of ceramics, and cannot solve the problem of large-scale utilization of metallurgical slag