Semi-finished pre-grinding vertical-milling and ball-milling combined grinding device

Abstract

The invention belongs to the technical field of cement grinding, in particular to a semi-finished pre-grinding vertical-milling and ball-milling combined grinding device which comprises a semi-finished pre-grinding vertical-milling machine and a ball milling machine, wherein the feeding end of the semi-finished pre-grinding vertical-milling machine is connected with the discharging end of a proportioning belt scale, a gas outlet is connected with a dust remover, and the discharging hole of the dust remover is connected with a finished product conveying machine; the discharging hole of the semi-finished pre-grinding vertical-milling machine is connected with a lifting machine through a vertical milling discharging belt, and the discharging hole of the lifting machine is connected with the feeding hole of the ball milling machine; the gas outlet of the ball milling machine is connected with the dust remover, the discharging hole of the dust remover is connected with the finished productconveying machine; and the discharging hole of the ball milling machine is connected with a powder concentrating machine through the lifting machine, the finished product fine powder discharging holeof the powder concentrating machine is connected with a third finished product conveying machine, and the crude powder discharging hole of the powder concentrating machine is connected with the feeding hole of the ball milling machine through a feed back conveying machine. The invention combines high yield and energy saving of the vertical milling machine with cement grading advantages of the ball milling machine, and has lower investment, lower electricity consumption, more reasonable grading of cement particles, very convenient maintenance and remarkable economic benefit.

Description

technical field [0001] The invention belongs to the technical field of cement grinding, in particular to a semi-final pre-grinding combined grinding device of a vertical mill and a ball mill. Background technique [0002] Traditional cement grinding uses a ball mill for grinding, which has a good shape of cement particles, good concrete operability, and good durability of buildings. However, ball mill grinding uses steel balls for crushing, which has low grinding efficiency and high power consumption. [0003] At present, the more advanced cement grinding process is a roller press plus a ball mill combined grinding device, which has two specific forms: one is the roller press for pre-grinding: using a roller press plus a dispersing classifier, followed by grinding Open-circuit grinding can increase the output of the mill by 40% to 50%. Because the material from the roller press has a considerable amount of fine powder, it is easy to cause the latter mill to over-grind and af...

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Problems solved by technology

[0002] Traditional cement grinding uses a ball mill for grinding, which has a good shape of cement particles, good concrete operation performance, and good durability of buildings. However, ball mill grinding uses steel balls for grinding, which has low grinding efficiency and high power consumption.

[0003] At present, the more advanced cement grinding process is a roller press plus a ball mill combined grinding device, which has two specific forms: one is the roller press for pre-grinding: using a roller press plus a dispersing classifier, followed by grinding Open-circuit grinding can increase the output of the mill by 40% to 50%. Because the material from the roller press has a considerable amount of fine powder, it is easy to cause the latter mill to over-grind and affect the latter mill. Grinding power consumption and clinker utilization rate; the other is the roller press as semi-final grinding device: the roller press and V-type powder separator are used to realize semi-finish grinding, and the output of the mill can be increased according to different process configurations 50% to 80%, but due to the high content of fine powder in the material from the V-type classifier, the high-efficiency classifier must be installed in the rear mill to form a double closed-circuit system. It is very large, consumes a lot of power, and the main fan is severely worn and must be replaced every 3 months. In addition, the common problem of the roller press is that the rollers cannot be replaced after wear and tear, and can only be maintained by surfacing, which is extremely difficult to maintain and seriously affects the operating rate of the system.

[0004] At present, domestic vertical mills are mainly used in new dry process kiln raw meal grinding. Tianjin Cement Industry Design and Research Institute and Chengdu Cement Industry Design and Research Institute have started vertical mill final grinding tests, but due to the appearance of cement particles in vertical mills, As well as the subsequent problems of concrete operability and durability, it is difficult to widely promote it at this stage

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