The slag micropowder is a powder material obtained by grinding the water-quenched granulated blast furnace slag to a prescribed fineness. This new type of green products, effective use of metallurgical blast furnace slag, slag to reduce footprint, reduce environmental pollution also play a role in promoting, truly turning waste into treasure, to achieve sustainable development. China's domestic slag micropowder products were successfully developed in Shanghai in 1996. In 2000, the national product standards were officially promulgated. After 2005, domestic enterprises have launched slag powder projects. In June of this year alone, several slag micro-powder start-up and operation projects were striking: Baosteel Development Co., Ltd. chemical production terminal built slag micro-powder vertical mill production line; international advanced slag powder production line was completed and put into operation in Anshan Iron and Steel Co., Ltd.; 600,000 tons of slag powder and so on. The slag micropowder project has small investment, small land occupation, significant benefits, short payback period, and is in line with national energy and environmental protection policies. It is a government-encouraged development project. Slag powder production line With the continuous development of slag grinding technology, the slag is ground to the corresponding fineness and the energy consumption is getting lower and lower, which lays a good foundation for the large-scale application of slag powder. The production process mainly includes vertical grinding, roller press, ball mill , vibrating mill, four final grinding processes, or vertical grinding + ball mill, roller press + ball mill combined grinding process, in which vertical mill produces slag powder It is the most common and rapid development, and the fineness of grinding is easily controlled at 400m2/kg or more, achieving the most economical fineness standard and fully utilizing its activity. The slag micropowder can also be combined with steel slag to produce composite powder, improve the life of the civil structure, and produce high-performance concrete with a certain proportion of other materials such as silica fume, thereby further improving the utilization rate of the slag powder. Since the production process of slag powder is relatively simple and the required investment is relatively small, the asset size of the slag powder production enterprise is generally relatively small. At the same time, due to the wide application and good performance of the downstream products of slag micropowder, the development space of slag micropowder products is better. Therefore, the development of slag micropowder production enterprises is fast. In recent years, there have been many domestic slag micropowder production enterprises of various scales. The economic and social benefits brought about by the gradual promotion of slag micropowder production are very obvious, but it is necessary to further strengthen scientific and technological innovation and equipment reform, and thoroughly study the comprehensive utilization of slag micropowder to increase the added value of its products. All in all, slag powder is a building material that has great use value and potential advantages, and has a broad market prospect.
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Focus on slag powder to develop green industry
In recent years, the use of slag micropowder processing has attracted much attention as an emerging industry, and its output has doubled every year. It is now close to 10 million tons/year. Many enterprises have invested heavily in the construction of slag micropowder production lines, upgrading the technology of slag micropowder processing and utilization, and expanding the application range. The products go abroad and are exported to overseas markets.