SU395336A1 - METHOD OF DUSTING WITH MILK - Google Patents

Description

There is a known method of dust collection by grinding, which is used in T1 pipe mills, by suctioning air and small dust-like fractions from the mill with a special fan, followed by cleaning it in dust collecting installations in stages 2-3. Purified air is emitted into the atmosphere.

However, the well-known method does not completely clean the air from dust particles and increase the productivity of mills due to the emission of a part of the most fine dispersing particles together with air into the atmosphere.

The purpose of the invention is to increase the efficiency of dust removal and increase the productivity of mills.

This is achieved by directing the air after the primary cleaning to the charging part of the mill, and the excess air that accumulates as a result of suction is periodically discharged to the atmosphere. In addition, before the primary cleaning dusty c-mes treated with magnetic water in an amount of not more than 1% by weight of the crushed material.

The proposed method is illustrated in the drawing.

The dust mixture that is sucked off from the mill / fan 2 is cleaned in the asp / extraction shaft 3, cyclone 4, electrostatic precipitator 5 and returned under the pressure generated in fan 2 to the charging part of the mill. The fan 6 serves to periodically discharge the excess air accumulated due to the suction. The control 7 can change the number of cleaning steps, sucking the dust-air mixture immediately after the aspiration shaft, after the cyclone or after the electrostatic precipitator.

To reduce the concentration of dust in the dust-air mixture returned to the last chamber of the mill with a special nozzle, it is possible to supply finely dispersed magnet water in an amount of not more than 1% of the ground material being crushed, and the fine fractions of dust are enlarged, which contributes to their intensive deposition in the pulverized box. and devices of the first stage of purification.

In cases where the individual components of the grinded matter contain increased moisture, periodically operating heater (heater) is built into the mill to prevent condensation of water chests into the return pipe of the dust-air mixture.

Due to the fact that the dusty air returns to the mill under pressure, the vacuum in the suction box decreases from 40-70 to 2-5 mm of water. Art. and the air inflow into the system from the environment is reduced by a factor of 2.5-3. This allows

saiM.KHVTbifl aspiration cycle, reducing by 70–80% the operating time of dust collection units. To discharge the excess air they are periodically turned on (no more than 10-15 minutes every hour, s).

The use of the proposed method of dust collection during grinding allows reducing irretrievable atmospheric emission by 75-80%, increasing the productivity of the mill by increasing the amount of collected dust, and increasing the service life of dust collection plants.

The proposed method can be used | On grinding installations of the building materials industry, la also in other areas of industry.

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Claims (2)

1. A grinding method for dusting, including sucking a dusty mixture of mills, such as pipe mills, and then cleaning it in several stages, characterized in that, in order to increase the efficiency of dedusting and increase mill productivity, the air after the initial cleaning is directed to the loading part mills, and the excess air, which is blown out by suction, is periodically discharged into the atmosphere. 2. The method according to claim 1, characterized by the fact that the dust-air mixture before primary cleaning is treated with o. magnetised water in an amount of not more than P / o of the weight of the material being ground. 17