System for preparing steel slag sintered bricks

Abstract

The invention discloses a system for preparing steel slag sintered bricks. The system is characterized in that: pretreating steel slag through a first ball milling mechanism, grinding the steel slag into steel slag powder with a particle size of smaller than or equal to 0.045 mm, and subjecting the ground steel slag powder to ageing treatment and moisture drying; putting into a placing chamber; and grinding ferric oxide powder in the first ingredient through a second ball milling mechanism, mixing the ground ferric oxide powder and steel slag powder in a first mixing chamber, and then adding silicon powder and argillaceous aggregate. The perfection of ferrite crystallization is further promoted in that the melting point and the dynamic temperature of the mixture are reduced, so that the mass transfer and heat transfer conditions of a liquid phase are improved, the crystallization of minerals such as ferrite and the like can be promoted,the realization of low-temperature sintering of steel slag bricks is facilitated, quicklime is added while the steel slag bricks are mixed and put into a third mixing chamber, and hydration and hardening are promoted to improve the compact strength of brick structure. After the mixture in the third mixing chamber is subjected to blank making and standing for a period of time, the mixture is fed into a calcining kiln to be sintered, and the produced steel slag sintered bricks have the characteristics of high strength and good air permeability.

Description

technical field [0001] The invention relates to the technical field of steel slag sintered bricks, in particular to a system for preparing steel slag sintered bricks. Background technique [0002] With the rapid growth of my country's economy every year, the demand for steel and its products is increasing. The steel output has exceeded 100 million tons since the early 1990s and has grown rapidly at a very high rate. It has become the world's largest producer of steel. The largest country has also brought technological revolutions in the iron and steel industry, such as oxygen blowing technology, hot metal desulfurization, out-of-furnace refining, blast furnace coal injection, controlled rolling and controlled cooling, etc., which have continuously improved the quality of my country's iron and steel products. With the improvement of the output of iron and steel products, the annual output of solid waste in the iron and steel industry is also increasing. In 2001, the solid waste...

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Problems solved by technology

[0003] Steel slag is the solid waste discharged during the steelmaking process. The discharge amount is very large, which can reach about 15% of the steel output. Due to the limitation of application technology, the application rate of steel slag in my country is only about 10%. It is mainly used in the field of building materials. Most of them are stored in stacks, which have exceeded 200 million tons, occupying a large amount of land, and causing environmental pollution such as water sources and air.

If it is not processed and utilized, it will cause more serious social problems. The strength of steel slag sintered bricks in the prior art is not high enough, and the water permeability is poor, so it cannot be widely used in daily life.

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