The Research Of Sintering Brick Using Steel Slag

With the quick development of the metallurgy industry, the amount of industrial solid waste increases by 20 million tons per year. If there is no comprehensive utilization, they will cause environmental pollution such as the river jam, air pollution and soil pollution. This paper first analyzes the chemical composition, physical characteristics and mineral component of steel slag. Then, focusing on the method of sintering, this paper mainly, discusses the strength of ground bricks after sintering. After discussing the sintering mechanism, the paper concludes that the sintering process is actually a mineral strength mechanism combined with a physical strength mechanism, i.e. the brick-baking process is the process of mineral crystallization. Only when the crystal molts and crystallizes, particles bond, migrate and the neck of cross-structure expands, can the physical strength mechanism be realized, i.e. the distance between particles shortens, porosity ratio decreases, volume loses and the integer shrinks. Other factors that have direct impaction on strength of steel slag bricks are also discussed in the paper, such as alkalinity, baking temperature, silicon powder content and slag pre-treatment. Through a series experiments, the proportion is steel slag / ferric oxide=1:1. These mixed powders with 10% silicon powder and an amount of hydrated lime, have been deposited for 24h and sintered under suitable heating temperature, the structure of the ferrite molecule can transform to an ideal needle or web-like structure which can ensure the strength of bricks. The ground bricks made under the above operational conditions can meet the strength demand and be used in road construction. Steel slag, after crushed and treated, can be utilized with other materials, and it can solve the slag utilization of magnetic selection and substitute the clay and cement that used in road construction. Thus "Clean Production", less waste discharge, energy saving, cost cutting and profit enhancing can be realized. Also, ecological environment protection, economical and social benefits can all be harmonized.