Finish grinding system for cement roller press

Abstract

The invention relates to a finish grinding system for a cement roller press. The finish grinding system comprises an outer circulation vertical mill, a first elevator, a vibrating screen, a steady-flow bin, the roll press, a second elevator, a powder selecting assembly, a dust collector, a chute, a fan and a chimney, wherein a discharging port of the outer circulation vertical mill is connected with a feeding port of the first elevator, a discharging port of the first elevator is connected with a feeding port of the vibrating screen, a discharging port of the vibrating screen is connected witha feeding port of the steady-flow bin, a discharging port of the steady-flow bin is connected with a feeding port of the roller press, a discharging port of the roller press is connected with a feeding port of the second elevator, a discharging port of the second elevator is connected with a feeding port of the powder selecting assembly, a powder discharging port of the powder selecting assemblyis connected with the feeding port of the steady-flow bin. According to the finish grinding system, the feeding granularity is controlled, so that the roller gap fluctuation of the roller press is small, and thus the vibration strength of the roller press is greatly weakened, the cement performance is ensured, and meanwhile the cycle load and the energy consumption are reduced.

Description

technical field [0001] The invention relates to a final grinding system of a cement roller press. Background technique [0002] At present, there are two main methods of cement grinding, one is the combined grinding or semi-final grinding method composed of roller press and ball mill, and the other is the final grinding method of vertical mill with internal and external circulation (built-in powder separator); the first In the first method, because the shape of the powder after extrusion by the roller press is mainly needle-like and flake-like, the cement needs more water and the performance of the cement is not good; in addition, the cycle load is relatively large, generally around 700%, and the cycle The amount of fine powder in the extruded material is relatively large, and the particle size range of the material is large (particle size ranges from tens of microns to tens of millimeters), which leads to large fluctuations in the roll gap of the roller press, which in turn...

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Problems solved by technology

[0002] At present, there are two main methods of cement grinding, one is the combined grinding or semi-final grinding method composed of roller press and ball mill, and the other is the final grinding method of vertical mill with internal and external circulation (built-in powder separator); the first In the first method, because the shape of the powder after extrusion by the roller press is mainly needle-like and flake-like, the cement needs more water and the performance of the cement is not good; in addition, the cycle load is relatively large, generally around 700%, and the cycle The amount of fine powder in the extruded material is relatively large, and the particle size range of the material is large (particle size ranges from tens of microns to tens of millimeters), which leads to large fluctuations in the roll gap of the roller press, which in turn leads to greater vibration and vibration of the roller press. The extrusion effect is not good, and in severe cases, water spraying is required to stabilize the material bed, but cement is different from cement raw meal powder, the performance of cement will be negatively affected after water spraying, and the strength of cement will decrease; the second method can adapt to the range of feed particle size For large materials, its adaptability to materials with large particle size is better than the first method, but compared with the first method, its energy consumption is relatively high, which needs further improvement

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