Several successful applications of steel slag processing technology

The steel industrial processes produce large amounts of solid waste, slag including not only the occupation of cultivated land, pollute the environment, but also a waste of resources. Steel slag processing and comprehensive utilization is one of the tasks of the sustainable development of the iron and steel industry. Several in engineering practice for the successful application of steel slag processing technology.

A waste heat since antipyretic boring process. The process mainly by the hot stuffy device, multi-stage crushing, screening, magnetic separation device, conveying systems, dust removal system, water circulation system and automatic control system. Down converter steel slag slag pit slag to be cooled to a temperature about 600 ℃ fashion into the boxcar, boxcar spraying water and spray time by controlling the slag boxcar within high-temperature quenching, cooling. Tank water and slag the complex temperature shock effects and the physical and chemical reactions, the slag quench cracking. Accounted for more than 60% of the total number of hot stuffy process can achieve slag 100% treatment; steel slag powder of high the hot stuffy processing slag, particle size of less than 10mm; steel and slag separation effect is good, easy magnetic separation, metal recycling taste up to: scrap w (TFe)> 95%, steel slag w (TFe)> 80%. Through the slag the free calcium oxide in the treatment of hot stuffy and free magnesia mass fraction is less than 2%.

Slag platter hot splash process. The process mainly by elevated platter slagging trolley, cooling pool, conveying, crushing, screening, magnetic separation system, dedusting system, water circulation system and automatic control system. Steelmaking production process temperatures up to 1500 ℃ and good mobility slag is first poured into a slag pot, transported to the processing line into elevated platter discharge, water spray, so that the slag is rapidly cooled to about 700 ℃, and then platter slag turned into slagging trolley and again water cooled to 200 ° C; then pour 3 pool cooling. The cooling process, the free calcium oxide and free magnesium oxide and water chemical reaction occurs, the volume expansion, and most of the slag was chalking. Then the crushing, screening, magnetic separation; elect tablets of iron and slag and iron into the metal silo tailings press diameters were shipped out of into the tailings positions after the building materials; recycled cooling water through precipitation cooling.

Slag wind nibs of the treatment process. The slag pot filled with liquid slag being lifted by crane to the tipping bracket, the slag is poured into the tundish. Slag taphole into flow slag tap gravity flow to the front of the granulator, the granulator speed airflow discharged crushed slag, liquid slag contraction solidified into spherical particles of about a diameter of about 2mm, falls quickly in the cooling pond cooling. Pool of slag by the spiral machine quickly upgrade to dried in a dryer, and then transported by belt conveyor to the implementation of the separation of scrap tailings after magnetic separator. Return steelmaking production over 1mm steel particles less than 1 mm steel powder used as a sintering flux tailings as a building material. The superheated steam produced by the water quenched granulated recycled for use in dry granulated slag. The process is suitable for high-temperature liquid slag processing, slag, the process is simple, safe and reliable; high temperature liquid slag is granulated into small droplets in the air first, and then dispersed rapidly cooled to room temperature solid-state grain products fall into the pool, explosion conditions of the "dross water" does not exist; steel slag separation thorough, uniform particles, granulated slag does not contain free lime and free magnesia, good stability, and less water consumption, and low energy consumption. (A)