Vertical roller mill in the metallurgical industry slag and steel slag processing applications

Now metallurgical industry's annual production of more than 10 billion tons of various types of high temperature industrial waste, and a huge accumulated amount. The waste is mostly slag and steelworks slag generated by the present processing slag, slag solid waste storage method in most cases natural stacking. In the stacking process slag, steel slag easily wind into dust, water is alkaline, and slag containing vanadium, titanium, likely to cause pollution to the surrounding environment.

Steel slag recycling both environmentally friendly and economical

The use of slag, steel slag,is that deep processing to be active component of concrete. Numerous studies have demonstrated the slag,steel slag ground to a specific surface area of 400m2 / kg ~ 550m2 / kg of powder, can be used to cement production of slag cement, slag can be re-mixed after serving as concrete admixture, even replace part of the same amount of cement, reduce cement costs and greatly increase the added value of slag, steel slag products. In addition, slag, steel slag powder finer, more easily release the free CaO Ca (OH) 2 in the hydration process, improve stability and increase the alkalinity of concrete liquid system, it can serve as a basic slag powder Activator late strength of the concrete has improved significantly. Meanwhile, the iron contained in the iron and steel slag can easily be collected it. CHAENG(Great Wall Machinery Co., Ltd.) use the slag vertical grinding mill technology, construction steel slag powder production line, with 1 ton of raw materials 2% iron content calculated, a line can produce 6000 tons per year of iron powder, according to 2000 yuan per ton of iron per year to saving 12 million yuan. Thus, the development of ultra-fine grinding technology of steel slag can effectively promote the comprehensive utilization of steel slag.

Currently in accordance with national standards and industry standards, slag cement, steel slag content between 20% to 50%. for 100,0000 tons of cement grinding station, roughly 30 million tons can be directly mixed with slag, steel slag, and not firing, thus reducing 36,000 tons of standard coal, in turn, can be reduced by 10,0000 tons of carbon dioxide emissions, environmental protection is of great significance.

Vertical mill grinding process advantages

Slag, steel slag grinding process technology, mainly roller press +ball mill grinding , vertical mill +ball mill grinding, vertical mill grinding. Wherein the vertical mill grinding process is simple, small footprint, low construction costs, high grinding efficiency, low energy consumption, is the ideal slag, steel slag treatment process.

Slag,steel slag vertical mill works as follows: the use of slag vertical mill feed and feeding centers in two forms side, material fall into the upper lock valve of vertical mill, slide along the feeding tube straight into the disc, along with rotating disc thrown outward, again cutting the vertical slide tube welding apparatus scraper scraping, was thrown into the grinding zone lining on the disc, abrasive surface grinding roll just above the grinding zone. On the disc are roller grinding material, by a small portion of the new material with high moisture and most over-the-mill finished with lower water composition. This is because a large part of the unfinished coarse material separated by the separator is returned, which is the recycle material. The slag discharge auxiliary roller compaction. Main roller rocker arm fixed to the main, a good material layer is configured by pressure grinding. Force by the roller itself weight and pressure generated by the hydraulic system. Roller through the grind bed friction rotation. Sensors and buffers for the rocker arm roller installed to prevent direct metallic contact with the disc. Was milled slag particles under the effect of centrifugal force is thrown out and through the ring gauge, where it is the collector loop through the wind increased airflow. Dust and gas mixture flows through the grinding chamber, which was equipped with a vertical mill liner wear of the cylinder surrounded enter welded to the vertical mill separator barrel on the finished separator will be elected. Through the annular air ring by a vertical mill discharge foreign matters, as well as in case of motility disorders, falls through the annular air ring roller mill cone slag grinding, by installing the disc following board scraper, scrape the drain mouth, both the slag after here by the gas tank is discharged into the recycle feed tube slide, grinding again, separator, until a qualified products.