SU1200975A1 - Tumbling barrel - Google Patents

Description

The invention relates to the design of mills used in the cement, aluminum, mining and other industries.

The aim of the invention is to reduce the moisture of shpam while maintaining; its fluidity and reduction of specific energy consumption.

Figure 1 schematically shows a drum mill, a longitudinal section; figure 2 - section aa in figure 1; on fig.Z - view B in figure 1; in Fig.4 classification device, side view.

The wet grinding mill consists of two, interconnected, hollow steel cylindrical bodies 1 of different diameters, separated by inter-chamber partitions 2 and radial walls 3 into several chambers. The first chamber 4 is designed for self-grinding of large-sized material and is made in the form of a cylindrical body with a diameter 1.7–3 times the diameter of the second mill building, and the length of the chamber is less than its diameter. It is equipped with stepped armored 5 and lifters (pouring shelves) 6. The second rod chamber 7, formed by two inter-chamber partitions 2, is filled with crushing rods 8. Five radial chambers 9 are formed by inter-chamber partitions 2 and radial walls 3.

All cameras are equipped with hatches 10 for inspection, repair and loading of grinding bodies. Radial chambers 9 with ball loading are separated by output partitions 2 and a classifier 11. The classifier 11 is equipped with holes 12, a cone 13 with holes 12, guide vanes 13 and spirals 15.

A pipe driver 16 is installed between the radial chambers 9. A steel side ring 17 is mounted around the entrance to the pipe driver 16 to direct the slurry flow to the klissifitsiruyushchy device 11.

I

The mill works as follows.

Bulk material with water enters through the inlet pin 18 into the first chamber 4, in which the material is picked up by lifters (pouring shelves) 6 and rises to the critical height of the drum, from which it falls, crushes, and crushes the material,

5 down below. Part of the material in the form of the finished sludge passes the inter-chamber partitions 2, the classifier 11. and is discharged through the exit pin 19. Large

The 10 fractions of the material, having passed through the first inter-chamber partition 2, are comminuted in the core chamber 7 and further enter the five radial spherical chambers 9 for fine grinding. The finished sludge that has passed through the classifier 11, together with the whole slag, is discharged through the outlet pin 19, and the fraction that has not passed through the holes

20 of the classifier 11, when the mill rotates, it enters the cone 13 and with the help of the spirals 15 enters the pipe joint 16, which returns to grinding into the second rod chamber 7 before grinding.

and

The wet grinding mill works on the principle of impact grinding in a closed cycle: in the lane

In the remaining chambers, by means of a stepped armor lining, in the absence of a chisel-normal load, which works by the method of abrasion. Thanks to the exception

35, the reduction of abrasive grinding reduced to a minimum the content of ultrafine fractions (5 microns), which increase the moisture content of the sludge while maintaining its fluidity. Reduction

40

the number of grinding units reduces the specific consumption of electricity for the grinding of raw materials, reduces the costs associated with the maintenance of equipment, increases

45 sa labor productivity, while reducing the specific fuel consumption for clinker burning by reducing the slurry moisture by 3-4% and creating a more reactive

^{50 of the} charge with an increased specific surface area during impact grinding, as well as selective ablation in the furnace due to a decrease in the fraction (5 μm),

55

The economic effect for the plant with a capacity of 2400 thousand tons of cement per year is 250 thousand rubles.

1.200975

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Claims (2)

DRUM MILL mainly for wet grinding of raw cement slurry, containing lined. Cylindrical body, made in the form of a chamber coaxially coupled with different-sized diameters chamber decreasing in cross section in the direction of discharge the end of the mill, one of which has radial partitions enclosed in end gratings with spherical grinding bodies in the cavities between them, and an output classifier, characterized in that, in order to reduce the moisture of the sludge while maintaining its fluidity and reduce specific energy consumption in the last chamber, counting in the course of the movement of the material, and, on the one hand, they adjoin the output classifier, and on the other hand, they adjoin the conjugate chamber, which is equipped with a rod grinding rod In this case, a pipe-worm is mounted between the radial partitions, one end of which is connected to the output classifier, and the other end is connected to the chamber with the rod grinding load. 5TS n "1200975 > fig! one 1200975 2