Steel slag aggregate and preparation method thereof

Abstract

The invention discloses steel slag aggregate and a preparation method thereof. The preparation method comprises the following treatment steps: sieving the steel slag after iron selecting, getting and flushing particles with particle diameter between 0.5mm and 20mm with high pressure water, and naturally drying in air; uniformly mixing 15.0-45.0 (in parts by weight) parts of coal slag, 40.0-80.0 parts of lime and 2.0-8.0 parts of mirabilite, packaging the steel slag into balls, drying for 2 hours at 105 DEG C; roasting the dried ball particles at 1260 DEG C-1360 DEG C, and preserving the heat for 4 hours; and cooling to the room temperature under the natural condition to obtain the steel slag aggregate. The steel slag aggregate obtained by the method not only has cementitious activity on surface for eliminating or improving an interfacial transition zone of aggregate and a cement hardened body, but also has a compact surface-layer structure and low concrete stirring water consumption; moreover, industrial waste steel slag is changed into things of value, so that environmental and social burden is reduced; dosage of the natural aggregates is lowered, and non-renewable resources are saved; and materials are easy to obtain, and process is simple.

Description

technical field [0001] The invention relates to a steel slag aggregate and a preparation method thereof, belonging to the technical field of solid waste treatment. Background technique [0002] Calculated according to the average level of the world's metallurgical industry, about 0.13 tons of steel slag is emitted for every ton of crude steel produced. The world emits about 150 million tons of steel slag every year, and our country is about 80 million tons. At present, the main treatment methods of steel slag are mechanical activation, thermal activation, chemical activation, etc., and the performance improvement is limited, and the comprehensive utilization rate is only about 15%. A large amount of piled steel slag not only occupies a large amount of arable land, but also after being exposed to the sun, rain and weathering, heavy metal ions or harmful ions seriously pollute the surrounding water and soil environment, and even endanger human health. Therefore, it is necess...

AI Technical Summary

Problems solved by technology

Although aggregate is a widely distributed natural resource, due to years of mining, the problem of unsustainable stone resources has begun to appear

Moreover, the massive mining and use of natural materials has also caused soil erosion and the deterioration of natural landscapes, seriously affecting the sustainable development of society, and even endangering the survival of future generations.

The composition of steel slag is similar to that of slag, but its gelling activity is extremely low due to reasons such as coarse grains and dense structure, and because it has experienced a high temperature of 1650 ° C, the surface layer is porous, with high hardness and poor grindability