A cement external circulation vertical mill semi-final grinding system

Abstract

The invention relates to a cement outer-circulating semi-finish grinding system of a vertical mill. The cement outer-circulating semi-finish grinding system comprises a belt conveyor, a magnetic separator, a metal detector, a three-way valve, the vertical mill, a bucket elevator, a powder concentrator, a dust collector, an air blower, a tube grinder and a chute, wherein the vertical mill is an outer-circulating vertical mill, and no powder concentrator is arranged in the outer-circulating vertical mill; the powder concentrator is formed by connecting a coarse powder V-shaped powder concentrator and a fine powder concentrator in series, and fine powder obtained from the coarse powder V-shaped powder concentrator enters the fine powder concentrator for concentration again; the fine powder obtained from the fine powder concentrator is served as a cement product A and collected through the dust collector and the air blower, and separated coarse powder is divided into two ways, wherein one way enters the tube grinder, and one way returns to the vertical mill for circulating grinding; and the powder which enters the tube grinder is ground into a cement product B by the tube grinder. The cement outer-circulating semi-finish grinding system disclosed by the invention achieves relatively high grinding efficiency by sufficiently exerting the high-efficiency crushing and grinding functions of the vertical mill and the high-efficiency grinding function of the tube grinder on the fine powder, thereby reducing the grinding energy consumption.

Description

technical field [0001] The invention relates to a cement grinding system, in particular to a cement external circulation vertical mill semi-final grinding system. Background technique [0002] In the field of cement grinding, tube mills are gradually replaced by efficient grinding equipment in terms of energy-saving grinding due to their low energy utilization and grinding efficiency. The vertical mill is a kind of material bed grinding equipment with high grinding efficiency. The vertical mill final grinding system has been widely used in cement raw material grinding and coal powder preparation, and there are many cases in cement grinding. In the past, people worried that the cement prepared by the vertical mill final grinding system needs high water content and poor appearance. Unfavorable properties such as low sphericity and too concentrated particle distribution have been gradually overturned by the practice of cement workers. The cement ground by the vertical mill fin...

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Problems solved by technology

But there are also powders between 250-320m2 / kg that affect the stable operation of the vertical mill

Although the grinding efficiency of the tube mill is low, especially the crushing and rough grinding efficiency of the tube mill is lower, the power consumption of the external circulation cement vertical mill pre-grinding system we developed has reached below 28kWh / t, which shows that the tube mill The grinding efficiency of the machine is relatively high for powders with a specific surface area of ​​220m2 / kg or more

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