Material wind countercurrent ball mill cement grinding system and grinding method

Abstract

The invention relates to a material wind counterflow type cement grinding system and method of a ball grinder. The cement grinding system comprises the ball grinder, a feeding port and a wind outlet are formed in a grinding head of the ball grinder, a discharging port and a wind inlet are formed in a grinding tail of the ball grinder, the feeding port is connected with a feeding device, the discharging port is connected with a cement store, the wind inlet is connected with the atmosphere, and the wind outlet is connected with a dust collecting device. According to the cement grinding system, the material incoming direction of the cement grinding system is feeding from the grinding head and discharging from the grinding tail, the airflow direction is entering from the grinding tail and existing from the grinding tail, and temperatures of the out-grinder cement and the grinder interior are quickly and greatly reduced in the way that materials and airflow are converse; the incoming materials are dried by the air flow simultaneously while cooling is conducted, water carried by the incoming materials is dried and discharged; and meanwhile, according to the water content and temperatures of the incoming materials and working conditions in the grinder, the wind volume in the grinder can be freely adjusted at any time, fineness of the out-grinder cement is reduced, the specific surface area of the out-grinder cement is improved, and the yields of the fineness and the specific surface area are greatly increased.

Description

technical field [0001] The invention relates to a cement grinding system, in particular to a cement grinding system and a grinding method of a material wind countercurrent ball mill. Background technique [0002] The existing ball mill cement grinding system is divided into two types: one is the ball mill open circuit system, and the other is the ball mill closed circuit system. But whether it is an open-circuit grinding system or a closed-circuit grinding system, the core process is that the material is fed from the grinding head and discharged from the grinding tail, while natural wind enters from the grinding head and exits from the grinding tail. [0003] The above two systems all have the following unavoidable defects: [0004] 1. The cold air enters and exits from the grinding head, the temperature of the air inlet is low, and the temperature of the air outlet is high. The high-temperature gas is discharged without any use, and the internal temperature of the ball mil...

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Problems solved by technology

[0004] 1. The cold air enters and exits from the grinding head, the air inlet temperature is low, the air outlet temperature is high, the high temperature gas is discharged without any use, and the internal temperature of the ball mill is high, and the moisture adaptability to incoming materials is poor

When the temperature inside the mill is high, the following disadvantages are likely to occur: 1) resulting in high temperature of the cement out of the mill; 2) causing dehydration of the gypsum in the cement in the mill; 4) lead to ball paste forging in the mill, reduce the grinding efficiency of the ball mill, decrease the output, and increase energy consumption; 5) affect the life of wearing parts such as the mill lining board and compartment board

Poor adaptability to incoming material moisture, prone to: 1) High incoming material moisture will cause full grinding of the mill, stop the material and shake the mill; 2) High incoming material moisture, because the inside of the ball mill cannot be dried and discharged in time The function of moisture is that the moisture content of the cement after grinding is high, the cement will be hydrated in advance, and the strength will be greatly reduced; 3) There will be a large amount of water vapor inside the mill that cannot be discharged in time, which will cause damage to the wearing parts such as the inner lining board and the compartment board. Corrosion, affecting its life

[0005] 2. Because the air and material in the prior art enter the mill from the same direction, the operator cannot adjust the air volume in the mill as needed

Because if you want to increase the air volume to quickly discharge heat and moisture, it will cause the material speed in the mill to be too fast, making the material out of the mill coarse and affect the quality of cement. Therefore, the adjustment of the air volume in the mill is limited, resulting in heat and moisture in the mill. Can not be discharged in time; the fineness and specific surface area of ​​the cement after grinding fluctuate greatly, and the qualified rate is low

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