CN111085308A - Equal-area ball filling and supplementing method for primary ball filling of ball mill in concentrating mill - Google Patents
Equal-area ball filling and supplementing method for primary ball filling of ball mill in concentrating mill Download PDFInfo
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- CN111085308A CN111085308A CN201911360058.6A CN201911360058A CN111085308A CN 111085308 A CN111085308 A CN 111085308A CN 201911360058 A CN201911360058 A CN 201911360058A CN 111085308 A CN111085308 A CN 111085308A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/1805—Monitoring devices for tumbling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
- B02C17/205—Adding disintegrating members to the tumbling mill
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Abstract
The invention discloses an equal-area ball-filling and supplementing method for primarily filling balls in a ball mill of a dressing plant, which comprises the following steps of firstly, screening and analyzing ore feeding of the ball mill to obtain the grain size composition of the ore feeding of the ball mill; then calculating the maximum sphere diameter required by the primary sphere according to the maximum particle size in the size fraction composition; secondly, setting a ball diameter difference according to the required maximum ball diameter, and determining the gradation specification of the initially-installed balls; then calculating the proportion of the initially loaded balls according to the initial loaded ball grading specification and the surface area equality principle; finally, determining the filling rate of the steel balls according to the fineness index required by the ore grinding process, determining the weight of the steel balls corresponding to each primary ball loading specification, and realizing the determination of the primary ball loading weight and specification; the subsequent steel ball replenishing principle is that the weight of the steel ball consumed is calculated according to the ore amount treated in one period in the production process and the unit consumption of the steel ball, the replenishing weight of the replenished steel ball is obtained according to the consumed weight, and the replenished steel ball is a primary ball with the maximum specification.
Description
Technical Field
The invention relates to the technical field of ore crushing, in particular to an equal-area ball filling and supplementing method for a ball mill of a concentrating mill.
Background
At present, in a dressing plant, the crushing and grinding operation is a preparation process before dressing, and the task of grinding ore is to further grind the crushed ore to a particle size suitable for the dressing requirement. The grinding effect in the ball mill is completed by the grinding medium-steel ball in the ball mill, the grinding of the ore is realized by the abrasion of the surface of the steel ball, and the quality of the ground product directly influences the technical index of the subsequent sorting operation. Meanwhile, in the construction investment and the operation cost of the concentrating mill, the ore grinding operation occupies a very large weight average. One of the important factors influencing the economic indicators of the beneficiation technology after the construction of a beneficiation plant is the ball filling and supplementing method of a ball mill in the production process.
In general, the typical motion trajectory of a load of steel balls, ore and the like in a ball mill includes a cascading motion state, a throwing motion state and a centrifugal motion state. Grinding of the steel balls under the falling motion state is mainly grinding and assisted by impact; the grinding effect of the steel ball in the throwing motion state is mainly impact and assisted by grinding; the steel ball does not normally produce an ore grinding effect in a centrifugal motion state. Therefore, regardless of the falling motion state or the throwing motion state, the steel balls are consumed while the ore is ground, and the consumption of the steel balls is realized through the abrasion of the surface, so that the steel balls need to be continuously supplemented in the ore grinding production process to make up for the consumed steel balls.
The existing ball mill has various ball filling methods, the size is an extremely important parameter to be considered when selecting a spherical medium, and the method determines the number of times of impact in the mill and the size of a grinding area, namely the strength of an ore grinding effect, and also determines the size fraction composition of an ore grinding product, and influences the ball consumption and the power consumption.
The currently common method for filling the ball comprises the following steps: a reasonable balance ball loading method, a simple ball loading and supplementing method and an accurate ball loading and supplementing method. Although many factors are considered in the reasonable balance ball filling method, the work of sieving and analyzing the processed ore and the like is also carried out, but the method is very complicated, wastes time and labor when being applied, and has not obvious effect; although the simple ball loading and supplementing method is simple, the method has poor pertinence and is not suitable for the properties of materials to be ground, and the ball diameter is too large, so that the ore grinding efficiency is low and the steel consumption is large; the method of accurately supplementing balls combines the advantages of the two methods, but the practical application process still has a plurality of inconveniences. The three methods all have the problem that the accumulation of the ineffective balls (crushed balls or deformed balls) and the small balls influences the raw ore treatment amount in the production process, the ineffective balls (crushed balls or deformed balls) and the small balls in the ineffective balls and the deformed balls need to be stopped at random to be selected, and then the steel balls with corresponding specifications are supplemented.
Therefore, how to provide a method for filling and repairing balls, which has the advantages of simple process, obvious effect of filling and repairing balls, cost reduction and economic benefit improvement, is a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides an equal-area ball loading and supplementing method for a ball mill of a concentrating mill, which comprises the steps of firstly, adopting the ball mill to feed ores for screening to obtain the grain size composition of the fed ores; then calculating the required maximum sphere diameter according to the maximum particle size in the particle size composition; secondly, setting a ball diameter difference according to the required maximum ball diameter, and determining the gradation specification of the initially-installed balls; then, according to the grading specification of the initially-installed balls, determining the initially-installed ball proportion according to the surface area equality principle; finally, determining the filling rate of the steel balls according to the indexes required by the ore grinding process, determining the weight of the steel balls corresponding to each primary ball loading specification, and realizing the determination of the primary ball loading weight and specification; the principle of adding steel balls in the subsequent ball mill production process is that the steel balls are added according to the weight consumed in the production process; firstly, calculating the weight of steel balls consumed in a certain period according to the ore amount processed in the certain period and the average unit consumption of the steel balls, wherein the certain period is the previous shift or the previous day; then adding according to the weight, and only adding the steel ball with the largest size each time. The method is used for determining the initial ball loading of the ball mill and adding the steel balls in the subsequent production process, so that the failed steel balls can be selected without periodic shutdown, the smooth running of the production process is ensured, the production efficiency is not reduced, the calculation process is simple, and the operation rate and the processing capacity of the ball mill can be effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an equal-area ball filling and supplementing method for primary ball filling of a ball mill in a concentrating mill comprises the following steps:
step 1: sampling and screening the feeding ore of the ball mill to obtain the composition of the ore feeding grade;
step 2: calculating the required maximum sphere diameter according to the maximum particle size in the size fraction composition in the step 1;
and step 3: setting the ball diameter difference required for primary loading according to the required maximum ball diameter in the step 2 and the requirements of ore grinding process and indexes, and determining the primary loading ball grading specification;
and 4, step 4: calculating the initial ball loading proportion according to the initial ball loading grading specification in the step 3 and the determined principle that the surface areas of the steel balls in all specifications are equal;
and 5: determining the filling rate of the steel balls according to indexes required by an ore grinding process, and calculating the weight of the steel balls corresponding to the primary balls of each specification by combining the primary ball proportion in the step 4;
step 6: according to the ore amount processed in a working period and the unit consumption of the steel balls in the production process, calculating the consumed weight of the steel balls, and obtaining the additional weight of the additional steel balls according to the consumed weight, wherein the additional steel balls are the steel balls with the maximum specification in the initial loading.
Preferably, the size fraction composition of the feeding ore is obtained in the step 1, and the maximum particle size of the feeding ore is determined to be the size F95 that 95% of the feeding ore passes through the sieve opening or the size F80 that 80% of the feeding ore passes through the sieve opening.
Preferably, the maximum sphere diameter in step 2 is calculated according to the following formula:
wherein B is the diameter of the steel ball; f is the sieving granularity; kmIs a correction factor; s is the ore density; c is the rotating speed rate of the mill; w is the stone work index of the ore to be ground; d is the inner diameter of the mill.
Preferably, B is the maximum sphere diameter, and the initial ball-assembling specification constituting an arithmetic progression is obtained from the sphere diameter difference.
Preferably, the spherical diameter difference is not less than 10 mm.
Preferably, the specific implementation process of step 4 is as follows:
step 41: calculating the unit surface area of each steel ball with the specification of the initially loaded ball, wherein S is the unit surface area, t is the number of each steel ball contained in each ton, and S is the surface area of a corresponding steel ball;
step 42: calculating the least common multiple of the unit surface areas of the steel balls of all the initial ball grading specifications;
step 43: and the ratio of the least common multiple of the unit surface area to the unit surface area is used as the initial ball-filling proportion.
Preferably, in the step 5, the weight of the steel ball is calculated according to the filling rate of the steel ball, and then the weight of the steel ball corresponding to the initial ball of each specification is determined by combining the initial ball proportion.
Preferably, the formula of the calculation of the consumption weight in the step 6 is GA＝QWAWherein G isAIs the amount of steel balls consumed in one of said working cycles, Q is the amount of ore processed in said working cycle, WAThe unit consumption of steel balls required for processing one ton of ore; the steel ball consumption in the working period is the additional weight required currently.
Compared with the prior art, the technical scheme shows that the equal-area ball filling and supplementing method for the primary balls of the ball mill in the concentrating mill, disclosed by the invention, obtains the size fraction composition of ore feeding of the ball mill through screening, obtaining the maximum sphere diameter of the primary balls according to the maximum particle size in the size fraction composition, determining the sphere ratio of the primary balls according to the set sphere diameter difference, then the proportion coefficient of the initially-loaded balls is determined by adopting the principle of equal surface area, so that the weights of the steel balls with various specifications of the initially-loaded balls are determined, calculating the weight of the steel balls consumed according to the principle that the consumption is equal to the supplement amount in the ore grinding process, realizing simple steel ball supplement of the ball mill by supplementing the steel balls with the same weight and the maximum specification, therefore, the ball mill can clean the invalid balls and the small balls without stopping, the operation rate of the ball mill is improved, the treatment capacity of the ball mill is further improved, and the economic benefit of an enterprise is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of an equal-area ball-filling and ball-supplementing method for a ball mill of a concentrating mill provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses an equal-area ball filling and supplementing method for a ball mill of a concentrating mill, which comprises the following steps:
s1: sampling and screening the feeding ore of the ball mill to obtain the composition of the ore feeding grade;
s2: calculating the required maximum sphere diameter according to the maximum particle size in the size fraction composition;
s3: setting a ball diameter difference required to be initially installed according to the required maximum ball diameter and the requirements of an ore grinding process and indexes, and determining the initial ball grading specification;
s4: calculating the initial ball-loading proportion according to the initial ball-loading grading specification and the determined principle that the surface areas of the steel balls of all specifications are equal;
s41: calculating the unit surface area of each steel ball with the specification of the initially loaded ball, wherein S is the unit surface area, t is the number of each steel ball contained in each ton, and S is the surface area of a corresponding steel ball;
s42: calculating the least common multiple of the unit surface areas of all the steel balls with the initial ball specifications;
s43: the ratio of the minimum common multiple of the unit surface area to the unit surface area is used as the proportion of the initially loaded balls;
s5: determining the filling rate of the steel balls according to indexes required by the ore grinding process, calculating the weight of the required steel balls, and then calculating the weight of the steel balls corresponding to the primary balls of each specification by combining the primary ball loading proportion in S4;
s6: and calculating the weight of the consumed steel balls according to the ore amount processed in one working cycle and the unit consumption of the steel balls in the production process, obtaining the supplemented weight of the supplemented steel balls according to the consumed weight, and only supplementing the steel balls with the maximum specification in the primarily-loaded balls each time.
The formula for calculating the weight consumed is GA＝QWAWherein G isAThe steel ball consumption in a working period, Q is the ore processing amount in a working period, WAThe unit consumption of one ton of ore steel balls is reduced; the steel ball consumption in one working period is the supplement weight needed currently.
In order to further optimize the technical scheme, the grain size fraction composition of the feeding ore obtained in the step S1 is determined by determining the maximum grain size in the feeding ore to be F95 of the size that 95% of the feeding ore passes through a sieve opening or F80 of the size that 80% of the feeding ore passes through the sieve opening.
In order to further optimize the above technical solution, the maximum sphere diameter in S2 is calculated as follows:
wherein B is the diameter of the steel ball; f is the sieving granularity which is the size of a certain percentage of sieve pores; kmIs a correction factor; s is oreDensity; c is the rotating speed rate of the mill; w is the stone work index of the ore to be ground; d is the inner diameter of the mill.
In order to further optimize the technical scheme, B is the maximum sphere diameter, and the specification of the initial ball forming the arithmetic progression is obtained according to the sphere diameter difference.
In order to further optimize the technical scheme, the spherical diameter difference is not less than 10 mm.
Examples
In a certain molybdenum ore phi 3.6m multiplied by 4.0m lattice type ball mill, the equal-area ball-filling method is adopted to determine the initial ball-filling proportion and the filling ball in the later production process, and in the embodiment, forged steel balls are adopted to replace low-chromium cast balls.
1. After the feed ore of the ball mill is sieved, the composition of the feed ore size fraction is obtained, as shown in table 1 below:
table 1 raw ore particle size analysis table
| Size fraction/mm | Yield (%) | Cumulative yield on sieve (%) | Cumulative yield under sieve (%) |
| +25 | 2.11 | 2.11 | 100.00 |
| -25+12 | 20.66 | 22.77 | 97.89 |
| -12+8 | 13.98 | 36.75 | 77.23 |
| -8+4.75 | 19.91 | 56.65 | 63.25 |
| -4.75+1.18 | 16.77 | 73.42 | 43.35 |
| -1.18+0.18 | 18.92 | 92.34 | 26.58 |
| -0.18+0.074 | 5.61 | 97.95 | 7.66 |
| -0.074+0.038 | 1.62 | 99.58 | 2.05 |
| -0.038 | 0.42 | 100.00 | 0.42 |
| Total up to | 100.00 |
The feed F80 was about 15mm and F95 was about 23 mm.
2. According to formula (1) a sphere diameter formula of Allis-Chalmers company and formula (2) a sphere diameter formula of Xnord company
And setting a correction coefficient K by combining field multi-year production practicemAnd calculating to obtain the diameter of the steel ball required by the ore, and finally determining that the diameter of the steel ball required by the ore is maximum 120 mm.
Determining the ball ratio of the initially loaded balls, setting the ball loading specification to select 5 types, and selecting the ball diameter difference of the steel balls with 5 specifications to be 20 mm. Namely, the initial ball loading specification of the ball mill is determined as follows: 120mm, 100mm, 80mm, 60mm, 40 mm.
3. The unit surface area, the least common multiple and the proportionality coefficient of the steel balls with 5 specifications are calculated and are shown in the following table 2.
TABLE 25 results relating to steel balls of specification
4. Determining the initial ball filling rate of the steel balls to be 35% according to the actual situation on site, calculating to obtain 64 tons of total steel balls under the filling rate condition according to the effective volume condition of the phi 3.6m multiplied by 4.0m lattice type ball mill, and determining the initial ball filling quantity of the steel balls of each specification according to the proportion in the table 2 as follows: the 120mm specification is 19.2 tons, the 100mm specification is 16 tons, the 80mm specification is 12.8 tons, the 60mm specification is 9.6 tons, and the 40mm specification is 6.4 tons.
5. Determining the total amount of the ball supplement according to the ore amount Q (t) processed in the previous day and the unit consumption W of one ton of ore steel ballsA(kg/t) determining the amount of steel balls consumed G in the previous dayA(kg), wherein the obtained ore amount Q of the previous day is 2200t, and the single consumption W of one ton of ore steel ballsA0.5 kg/t; therefore, the steel ball consumption GA is QWA-2200 t/d x 0.5 kg/t-1100 kg in the previous day. Namely 1.1 ton steel ball is added every day.
6. After the ball filling and supplementing method is applied for 3 months, the phenomena of more failed balls in a mill, small ball enrichment, reduced treatment capacity and the like in the prior production process do not occur.
7. After applying the ball filling method for 3 months, the results obtained are compared as follows:
(1) the processing capacity of the ball mill is increased from 87.07t/h to 90.43 t/h;
(2) the unit consumption of the steel balls is reduced to 0.49kg/t from 0.94 kg/t;
(3) the content of-200 meshes in the ore grinding grading overflow product is improved from average 50% to 53%, and is improved by 3 percentage points; and the content of 400 meshes is increased from the original average 35 percent to 36 percent, only 1 percent is increased, and the ore grinding phenomenon is not deteriorated.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An equal-area ball filling and supplementing method for primary ball filling of a ball mill in a concentrating mill is characterized by comprising the following steps:
step 1: sampling and screening the feeding ore of the ball mill to obtain the composition of the ore feeding grade;
step 2: calculating the required maximum sphere diameter according to the maximum particle size composed of the size fractions in the step 1;
and step 3: determining the primary ball grading specification according to the required maximum ball diameter in the step 2 and the ball diameter difference required to be primarily installed, which is set according to the ore grinding process and the index requirement;
and 4, step 4: calculating the initial ball loading proportion according to the initial ball loading grading specification in the step 3 and the principle that the surface areas of the steel balls in all specifications are equal;
and 5: determining the filling rate of the steel balls according to the indexes required by the ore grinding process, and calculating the weight of the steel balls corresponding to the primary balls of each specification by combining the primary ball proportion in the step 4;
step 6: calculating the weight of the steel ball according to the ore amount processed in one working cycle and the unit consumption of the steel ball in the production process, and obtaining the additional weight of the additional steel ball according to the consumption weight, wherein the additional steel ball is the initial ball with the maximum specification.
2. The method as claimed in claim 1, wherein the maximum particle size of the ore is determined to be F95 that is 95% of the ore passing through the sieve holes or F80 that is 80% of the ore passing through the sieve holes according to the size fraction composition of the ore in step 1.
3. The method for equal-area ball filling and supplementing of the primary ball of the ball mill of the concentrating mill according to claim 1, wherein the maximum ball diameter in the step 2 is calculated by the following formula:
wherein B is the diameter of the steel ball; f is the sieving granularity; kmIs a correction factor; s is the ore density; c is the rotating speed rate of the mill; w is the stone work index of the ore to be ground; d is the inner diameter of the mill.
4. The method according to claim 1, wherein B is the maximum ball diameter, and the primary ball grading specifications forming an arithmetic progression are obtained from the ball diameter difference.
5. The method for equal-area ball filling and supplementing of the primary balls of the ball mill of the concentrating mill according to claim 1, wherein the difference of the ball diameters is not less than 10 mm.
6. The equal-area ball filling and supplementing method for the initial ball filling of the ball mill of the concentrating mill according to claim 1, wherein the specific implementation process of the step 4 is as follows:
step 41: calculating the unit surface area of each steel ball with the specification of the initially loaded ball, wherein S is the unit surface area, t is the number of each steel ball contained in each ton, and S is the surface area of a corresponding steel ball;
step 42: calculating the least common multiple of the unit surface areas of the steel balls with the initial ball specifications;
step 43: and the ratio of the least common multiple of the unit surface area to the unit surface area is used as the initial ball-filling proportion.
7. The method as claimed in claim 1, wherein the step 5 is to calculate the weight of the steel balls according to the filling rate of the steel balls, and then determine the weight of the steel balls of each of the initial ball specifications by combining the initial ball ratio.
8. The method for equal-area ball filling and supplementing of the primary balls of the ball mill of the concentrating mill according to claim 1, wherein the formula for calculating the consumption weight in the step 6 is GA＝QWAWherein G isAIs the amount of steel balls consumed in one of said working cycles, Q is the amount of ore processed in said working cycle, WAThe unit consumption of steel balls required for processing one ton of ore; the steel ball consumption in the working period is the additional weight required currently.
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| CN115337999A (en) * | 2022-08-29 | 2022-11-15 | 河北西柏坡第二发电有限责任公司 | Calculation method for steel ball amount periodically replenished by steel ball coal mill |
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