Steel residue composite powder and preparation method thereof

Abstract

The invention relates to the field of cement building material production technology application. A purpose of the invention is mainly to reduce the production cost of enterprises by replacing or reducing clinker consumption for cement production with steel residue composite powder. The invention discloses steel residue composite powder and a preparation method thereof, wherein the steel residue composite powder comprises the following raw materials by weight: 36-42% of steel residue, 4-6% of gypsum, 12-18% of fly ash, 3-6% of silica fume, 2-4% of pumice, 5-8% of clay, 12-17% of quartz sand, 10-15% of coal gangue, 2-4% of a surface enhancer, 1.5-2.5% of a grinding aid and 2-4% of an aqueous defoaming agent. The preparation method comprises: crushing, aging, primary magnetic separation, secondary magnetic separation, mixing, grinding and dehydration. According to the invention, through the technological innovation, waste raw materials such as steel residue, fly ash and the like are utilized to improve the technological formula, so that the waste resources and the like are fully utilized, and the purpose of changing of waste into treasure is achieved; the method is simple and practical in operation, and can effectively reduce the clinker sintering heat consumption, improve the dry shrinkage rate of the cement clinker, enhance the curing rate and the compressive strength of the cement clinker, prolong the service life of cement and ensure the construction quality.

Description

technical field [0001] The invention relates to the application field of cement building material production technology, and specifically provides a steel slag composite powder for cement clinker production and a preparation method thereof. . Background technique [0002] Cement is the main material in my country's building materials industry, especially in recent years, with the rapid development of real estate, the demand for cement is also increasing. With the tightening of the country's supervision of land resources, especially the current emphasis on environmental protection, the concept of green ecological development that requires both gold and silver mountains and green mountains and green waters is proposed. Therefore, while protecting national soil resources and green development, the comprehensive utilization of waste resources is particularly important. On the one hand, some large steel mills in the iron and steel industry produce hundreds of millions of tons o...

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Problems solved by technology

On the other hand, a large amount of waste steel slag and waste furnace slag were landfilled extensively or regardless of the impact on the environment in the past, which not only seriously affected the polluted soil, caused serious deterioration of groundwater quality, but also seriously affected the surrounding environment and endangered future generations. A small amount of scrap steel slag and waste furnace slag can be recycled in time, but it is far from the reality. It is necessary to find a way out for scrap steel slag and waste furnace slag to be recycled

[0003] At present, in the traditional cement industry production, fly ash, waste gypsum, and limestone are still the main raw materials in the clinker components for cement production. Due to the high content of iron in scrap steel slag and waste furnace slag, Simply mixing scrap steel slag and waste furnace slag into clinker to produce cement will often lead to a large amount of spalling of the cement in actual use, such as floor pouring, which will affect the quality of the house and bring serious safety hazards. Therefore, it is urgent to use technological innovation to comprehensively recycle waste steel slag and waste furnace slag waste resources, turn waste into treasure, and meet the requirements of steel mill production and environmental protection supervision

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