Enter-type closed-circuit grinding system in returning powder

Abstract

The invention discloses an enter-type closed-circuit grinding system in returning powder, belonging to the technical field of powder engineering. The system comprises a tube mill, a powder concentrator and a powder returning storehouse; the tube mill comprises a grinding head feeding mouth, a grinding powder returning inlet, a spiral feed spoon, a grinding mill cylinder, a coarse grinding storehouse, a double-layer storehouse separating board, a fine grinding storehouse and a hinged support valve; in the technology, a group of grinding powder returning inlets with hinged support valves are distributed in the radial direction in the double-layer storehouse separating board to ensure that the grinding process conforms to the requirements of a milling mechanism that big balls grind coarse andsmall balls grind fines, and the group of grinding powder returning inlets are connected with a group of spiral feed spoons rotating with the grinding mill cylinder body; a feed spoon powder returning storehouse wraps the periphery of the spiral feed spoon, and receives returning powder sorted by the powder concentrator; the feed spoon extracts and receives the returning powder of the powder returning storehouse; the returning powder is placed into the fine grinding storehouse for fine grinding to realize closed circuit grinding between the grinding mill fine grinding storehouse and the powder concentrator. The invention is applicable to the closed-circuit grinding system to prepare powdery materials, improves grinding probability and effect of the grinding coarse in initial coarse grinding storehouse, gives full play to the grinding function of a small grinding body of the fine grinding storehouse on fines, and reduces grinding energy consumption.

Description

technical field [0001] The invention belongs to the technical field of powder engineering and is applied to a closed-circuit grinding system to prepare powdery materials. Background technique [0002] The closed-circuit grinding system of current technology such as Figure 4 As shown: the material to be ground enters the coarse grinding chamber B22 through the feeding port B21 of the grinding head, and after being impacted and crushed by the larger grinding body in the coarse grinding chamber, it enters the fine grinding chamber B24 through the partition board B23, and is crushed by the fine grinding chamber B24. After being ground by the small grinding body, it enters the classifier B25 for classification treatment, and the qualified fine powder is discharged from the fine powder port B27; the unqualified slightly coarse material is discharged from the powder return port B26, and enters the grinding head together with the initial grinding materials Feeding port B forms a cl...

AI Technical Summary

Problems solved by technology

Because the diameter of the grinding body in the coarse grinding chamber is usually greater than 60mm, and the returned powder of the powder classifier is usually less than 1mm, and the weight ratio of this returned powder to the initial abrasive is generally 60% to 150%, so this returned powder enters the The coarse grinding chamber not only cannot effectively crush, but also affects the crushing of the initial grinding material due to the pad effect, increasing energy loss

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