RU79803U1 - BRONEFOUTERING OF SELF-GRINDING MILLS OR HALF-MILLING - Google Patents

Abstract

Armor-lining of self-grinding or semi-grinding mills refers to grinding equipment and can be used in self-grinding or semi-grinding mills for grinding raw materials and ores in mining, metallurgical, chemical, cement and other industries. Armor lining of mills contains armor plates with technological lifters, lifters along the length of the mill are made of variable height with decreasing it from the loading to the unloading end of the mill, while the ratio of the maximum and minimum elevators heights along the length of the mill is from 1.2 to 10. Smaller ratios of elevator heights correspond to mills with a large ratio of D: L (4: 1), and large ratios of elevators heights - mills with a lower ratio of D: L (1: 1). The drum mill comprises a housing 1 with loading and unloading ends 2 and 3, respectively, armored lining, made in the form of armor plates 4 with technological elevators 5.

Description

The inventive utility model relates to grinding equipment and can be used in mills of self-grinding (SI) or semi-grinding (PSI) for grinding raw materials and ores in the mining, metallurgical, chemical, cement and other industries.

Known armored lining with armor plates of various configurations (Duda V. "Cement", M., 1981, pp. 164-165).

The disadvantage of the design is the low grinding efficiency.

The closest analogue is the lining of SI or PSI mills (Auto St. No. 1278022, class V02C 17/22, 1986) with high technological elevators for gripping and lifting large masses of material, as well as its larger pieces.

The disadvantage of such a lining and other known for these mills is the low efficiency of grinding material, due to the same height of the lifters along the length of the mill SI or PSI.

It is well known that in mills the movement of material occurs due to a decrease in its level in the loading compared to its unloading ends. However, when studying the processes of grinding material in SI or PSI mills, an increase in the level of material in the discharge above the loading end of the mill was noted. (Leites A.B., Zhelyabin L.V. Experience in industrial operation of the Cascade mill in the processing of diamond ores. Non-ferrous metals, 1959, No. 4, pp. 29-33).

The experience of the Olipiadinsky GOK showed that in the “long” mill PSI 7 × 7 m with D: L = 1.: 1 material levels at the unloading and loading ends

the mills are approximately the same and lower than in the center. These paradoxes are explained by us, the influence of the energy of the loaded material in the zone of its fall on the rise of the material during rotation of the mill and its distribution over its body. This leads to a higher level of material in the vertical plane along the length of the mill passing through its center, at the loading end of the mill, than in the middle and especially at the unloading end and creates the possibility of movement of the material along the length of the mill. In “short” SI or PSI mills, for example, with D: L = 2: 1 [3], the influence of the energy of the loaded material on the loading rise in the mill extends to the discharge end (discharge grill), and in “long”, for example, with D : L = 1: 1 - to the center of the mill.

The sound of the casing of the working mill PSI 7 × 7 m varies in length from a dead end at loading to a sharp metal at its discharge ends. A noticeable sorting of the balls along the length of the mill when it stopped was not detected. A greater rise in the load of material with balls causes a shift of the “false heel” towards the mill at the discharge end, which, with a larger loading path, is the main reason for the single impact of a part of the balls on the “bare” lining.

The grinding efficiency is underestimated in “short” SI or PSI mills due to insufficient loading rise at its loading end, and in “long” mills additionally due to idle blows of a part of the balls to the “bare” lining.

The objective of the utility model is to increase the grinding efficiency in SI or PSI mills.

The problem is solved in that in the armor lining of mills of self-grinding or semi-grinding, made in the form of armor plates with technological lifters, technological lifters along the length of the mill are made of variable height with a decrease in it from loading to unloading

the ends of the mill, while the ratio of the maximum and minimum elevators, along the length of the mill, is from 1.2 to 10.

Smaller elevator elevation ratios correspond to mills with a large D: L ratio (4: 1), and larger elevator elevator ratios correspond to mills with a lower D: L ratio (1: 1).

The technical result of the utility model is the intensification of the process of grinding material as well as increasing productivity by increasing the amount of material loaded and increasing the overall fill factor of the mill.

Figure 1 schematically shows a section of a mill SI or PSI.

The drum mill comprises a housing 1 with loading and unloading ends 2 and 3, respectively, an armored lining made in the form of armor plates 4 with technological elevators 5, which smoothly or stepwise, as shown in Fig. 1, decrease in height towards its discharge end. The filling level of the load (material or material and balls) along the length of the mill at rest is shown by broken lines 6 and 6a, the level of loading of the load in a vertical plane passing along the length of the mill through its center is shown by lines 7 and 7a during operation, and the level of loading rise by mill body - lines 8 and 8a. Lines 6, 7 and 8 correspond to the invention, and lines 6a, 7a and 8a correspond to the prototype, i.e. well-known lining with technological elevators of constant height along the length of the mill.

As can be seen from this figure, at the beginning of the loading end 2 of the mill body 1, the loading filling levels during the mill operation of the proposed armored lining and the prototype (respectively lines 7 and 7a) are the same, and the filling level of the mill loading at rest (line 6) is higher than that of the prototype (line 6a). During mill operation, there is no outflow of pulp and bulk material through the loading neck, since there is no increase in the level of loading during operation

mills (line 7) at the beginning of the loading end 2 of the mill due to the greater rise and distribution of the load on the housing 1 (line 8).

An increase in the distribution of the load over the mill body 1 with higher technological elevators 5 at the loading end of the mill 2 (line 8) compared to the prototype (line 8a) allows, firstly, to intensify the process of grinding material, and secondly, to increase productivity by increasing the amount of material loaded and increasing the overall fill factor of the mill.

An increase in the load level during the mill operation (line 7) at the discharge end of the 3 mill and a slight decrease in the load distribution (line 8) over the mill body 1 with lower technological elevators 5 can eliminate idle ball impacts on the “bare” lining and thereby also intensify process of grinding material. It should be noted that an increase in the overall fill factor of the mill allows to increase both the fill level of the mill (line 6) and the loading level (line 7) at the discharge end of the mill, which, in turn, will shift the “false heel” in the direction opposite to the rotation of the mill and will eliminate the blank blows of balls.

Claims (1)

The armor lining of self-grinding or semi-self-grinding mills, made in the form of armored plates with technological lifters, characterized in that the technological lifters are made of variable height along the length of the mill with decreasing it from loading to unloading ends of the mill, while the ratio of the maximum and minimum elevators height along the mill is from 1 , 2 to 10.