What is the preparation method of slag micropowder?

The preparation methods of slag micropowder mainly include ball mill system, vertical roller mill system and roller press system. Ball mill system investment is low, but due to its high energy consumption, high noise, and small stand-alone capacity, it is generally used for small-scale production. The roller press is a new type of energy-saving grinding equipment developed by the German Humboldt Company in the mid-1980s. It has significant energy-saving effects. However, due to high investment, complex systems, high technical requirements, and heavy equipment maintenance, it has not been popularized and applied much. Although the investment of the vertical roller mill is relatively high, the system is simple, reliable to use, easy to adjust the fineness, and has the characteristics of significant production increase, energy saving effect and low noise. It can meet the requirements of large-scale factories, so it has been widely used.

As a grinding equipment, vertical roller mill integrates fine crushing, grinding, drying, lifting and powder selection. It has low power consumption, good sealing performance and 30~50 db lower noise than ball mill. It can be arranged in the open air, occupies a small area, is simple in process, and operates reliably. By adjusting the speed of the powder separator, the gas flow in the mill and the grinding pressure, and combining it with a suitable baffle ring height cabinet, the required fineness and reasonable particle size distribution can be easily obtained.

The biggest advantages of using vertical roller mills in the preparation method of slag micropowder are high single-machine output, low power consumption, and reliable operation. The moisture content of the grinding slag is allowed to be as high as 25%, and it has strong adaptability. The specific surface area of the finished product can reach 450~600 m/kg, which is conducive to the large-scale production of ultra-fine slag. Nowadays, domestic and foreign cement equipment companies are constantly developing new wear-resistant materials, improving the design of rollers and grinding discs, appropriately reducing the grinding disc speed, optimizing hydraulic systems, lubrication systems, etc. In particular, the use of continuous surfacing technology effectively extends the service life of wear-resistant parts, reduces operating costs, and improves equipment operation rate.