Raymond mill can be divided into dry Raymond mill and wet Raymond mill according to their dry and wet conditions. Abroad, in the fifty years, dry Raymond Mill accounted for a large proportion, about 70%. With the progress of technology and the increasing demand for energy saving and environmental protection, wet Raymond Mill has developed rapidly, and it has been ultra-dry Raymond Mill, accounting for more than 75% of the total amount of Raymond Mill. Compared with dry Raymond mill, wet Raymond mill has the following advantages:
1. Investment of wet Raymond mill is generally lower than that of dry Raymond mill. Under the same conditions, the investment of wet Raymond mill is approximately the same as that of general grinding process. Dry Raymond mill must have a set of air system with many auxiliary equipment, while wet Raymond mill has fewer auxiliary equipment and simple material transportation equipment, so its investment is about 5%~10% lower than dry Raymond mill. The power consumption of wet Raymond mill is higher than that of dry Raymond mill, but the power consumption of dry Raymond mill plus wind system is higher than that of wet Raymond mill.
2. For continuous dry Raymond mill, due to the influence of ore humidity, a very thin material layer is formed on the surface of ore and liner, so the energy consumption per ton of ore is 25%~30% higher than that of wet Raymond mill.
3. Raymond mill has strict requirements for the moisture content of raw ore. Clay, water should be less than 49%, with less clay, water at about 5%, there is no much impact on production. When the water is large, will cause the decrease of discharge or not line, in order to reduce the moisture, to increase air facilities, investment and production cost of the dry Raymond mill are improved. The wet Raymond mill can handle high water and mud containing ores. Don't choose low-grade magnetic iron ore, wet Raymond mill is easy to obtain any of the required size, and can be adapted by magnetic separation.