CN107626433B - Method for determining steel ball adding amount by controlling power of large-scale overflow ball mill - Google Patents
Method for determining steel ball adding amount by controlling power of large-scale overflow ball mill Download PDFInfo
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- CN107626433B CN107626433B CN201710749478.8A CN201710749478A CN107626433B CN 107626433 B CN107626433 B CN 107626433B CN 201710749478 A CN201710749478 A CN 201710749478A CN 107626433 B CN107626433 B CN 107626433B
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Abstract
The invention discloses a method for determining the steel ball supplementing amount by controlling the power of a large-scale overflow ball mill, which obtains the mill running power under the condition of the optimal filling rate through targeted experimental research and takes the mill running power as a reference value of the normal production running power; the change of the filling rate of the ball mill is deduced by monitoring the change of the running power of the ball mill in real time, so that the accurate tracking of the ball adding amount is realized, and the stable running of the ball mill under the condition of the optimal running power is ensured; the specific change value of the running power is used as the calculation basis of the ball adding amount, so that the good running of the mill under the condition of the optimal filling rate is ensured, and the reasonability, the scientificity and the prior operation of the ball adding means of the ball mill are realized.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a method for determining steel ball supplementing amount by controlling the power of a large-scale overflow ball mill.
Background
The ore mill is used as a traditional grinding device and widely applied to departments of metallurgy, chemical industry, cement, ceramics, building, thermal power, national defense industry and the like. Particularly, in the mineral separation department in the metallurgical industry, the ore grinding operation is of great importance. The ball mill is divided into a lattice type ball mill and an overflow type ball mill according to different ore discharging modes, and is the most common ore mill adopted by the current ore dressing plant. The overflow ball mill mainly comprises a cylinder body, an end cover, a main bearing, a hollow shaft neck, a transmission gear, an ore feeder and the like. The ore discharge of the mill is realized by that the ore pulp in the ore mill has a certain inclination towards the discharge end because the hollow shaft diameter of the discharge end is slightly larger than that of the feed end. When the height of the ore pulp surface is higher than the lowest generatrix of the inner diameter of the discharge opening, the ore pulp overflows and is discharged out of the mill. The overflow ball mill is not forced to discharge ore at high material level, the discharge speed is low, so the retention time of the ore material in the machine is long, the effective action of the medium is low, the overflow ball mill is seriously over-milled, and the treatment capacity is lower than that of the grid type with the same specification.
Each kind of mine in China is used for mineral separation and grinding to process billions of tons of ores every year. In the process of grinding, along with the grinding, impacting and other actions on the ore, the grinding medium is continuously consumed while grinding the ore, and in order to keep the normal operation of the grinding operation, the consumed grinding medium needs to be supplemented so as to ensure the filling rate of the mill and the original gradation of the medium size. At present, the medium supplement amount of a plurality of ball mills is usually quantitatively added by manpower regularly or irregularly, the disordered operation method is easy to cause that the grinding medium cannot be timely and accurately supplemented after being abraded, so that the grinding efficiency and the grinding energy consumption are influenced. The Chinese patent application No. CN201210088934.6 discloses a dynamic system for the loading capacity of a grinding body in a barrel type ball mill and an application method thereof, wherein the loading capacity of the grinding body is dynamically optimized according to an optimization target, and the no-load current or power and the inflection point current or power under the optimal loading capacity of a steel ball are obtained. In the subsequent operation process, the program captures the inflection point current or power and the no-load current or power, estimates the loss of the grinding body according to the deviation, outputs the required steel ball addition amount, and adds the steel ball amount according to the steel ball addition amount through a ball adding machine to realize the dynamic automatic addition of the grinding body. However, under the influence of the factors such as the feeding granularity of ore grinding, the discharge granularity, the concentration of ore grinding, the filling rate of the mill, the rotating speed rate of the mill and the like, whether the inflection point value is the record value under the optimal ore grinding condition is difficult to judge.
Disclosure of Invention
The invention aims to solve the technical problem that the conventional method for supplementing the steel ball amount to the ball mill is easily interfered by other factors to cause misjudgment, and provides a method for determining the steel ball supplementing amount by controlling the power of the large-scale overflow ball mill.
The technical scheme of the invention is as follows: the method for determining the steel ball replenishing amount by controlling the power of the large-scale overflow ball mill comprises the following steps: (1) determining the optimal filling rate of the large overflow ball mill; (2) recording the optimal running power W of the ball mill under the optimal filling rate when the ball mill normally works1(ii) a (3) When the ball mill normally works within the rated power, adding a certain mass of steel ball delta into the ball mill1Recording the running power W of the ball mill at the moment2(ii) a (4) According to the formula Wa＝(W2-W1)/δ1Calculating the variation value of the average supplemented operation power of the ball mill per ton of steel balls, wherein WaBall milling for replenishing unit steel ballIncrease in machine running power in kW/t to ensure WaThe accuracy of the method can be repeatedly measured and calculated for many times to obtain an average value(5) Monitoring the running power Wr of the ball mill in real time and calculating W1and the difference between Wr andA ratio n of (i.e.(6) When inWhen in use, steel balls are added into the ball mill according to the practical production conditionIn the process, steel balls are required to be supplemented into the ball mill, the steel ball supplementing amount is delta a, wherein delta a is n, the unit is t, V is the effective volume of the large-scale ball mill, and the unit is m3And 4.8 is the bulk density of the steel balls in t/m3(ii) a (7) Monitoring the change of the running power of the ball mill after adding the balls, and repeating the step (5) if the change is not detectedCompleting a ball adding operation ifStep (6) is repeated.
In the scheme, the step (1) comprises the steps of adopting a filling rate reducing test period to reduce the load of the ball, observing fineness change of an ore grinding product in an inflection point observation period, adjusting back to increase the ore grinding fineness required by the filling rate period and recovering, and searching for the optimal filling rate by using a filling rate reducing downhill method through a field exploration production test; the grinding fineness of the grinder is taken as a control target, and the optimal filling rate is finally and comprehensively determined by the fineness and the sorting index.
W in the above scheme2、Wa、And Wr are both within the rated operating power of the ball mill.
In the above schemeIs a weighted average of three or more times.
The method has the advantages that the running power of the ball mill is monitored in real time, the number of the steel balls to be added is determined through the change of the power of the ball mill, the method is a simple, effective and quick method for judging the adding amount of the steel balls, the problems of more and less adding amount of the steel balls commonly existing in the ball adding process are solved, and the amount of the steel balls lost in the ore grinding process is stably and accurately added.
drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
As shown in fig. 1, the present invention comprises the steps of: (1) determining the optimal filling rate of the large overflow ball mill; (2) recording the optimal running power W of the ball mill under the optimal filling rate when the ball mill normally works1(ii) a (3) When the ball mill normally works within the rated power, adding a certain mass of steel ball delta into the ball mill1Recording the running power W of the ball mill at the moment2(ii) a (4) According to the formula Wa＝(W2-W1)/δ1calculating the variation value of the average supplemented operation power of the ball mill per ton of steel balls, wherein WaAdding the increase value of the operating power of the ball mill in unit of kW/t to ensure WaThe accuracy of the method can be repeatedly measured and calculated for many times to obtain an average value(5) Monitoring the running power Wr of the ball mill in real time and calculating W1And the difference between Wr andThe ratio n of (a) to (b),Namely, it is(6) When inWhen in use, steel balls are added into the ball mill according to the practical production conditionIn the process, steel balls are required to be supplemented into the ball mill, the steel ball supplementing amount is delta a, wherein delta a is n, the unit is t, V is the effective volume of the large-scale ball mill, and the unit is m3and 4.8 is the bulk density of the steel balls in t/m3(ii) a (7) Monitoring the change of the running power of the ball mill after adding the balls, and repeating the step (5) if the change is not detectedCompleting a ball adding operation ifStep (6) is repeated.
The present invention will be further described with reference to the following examples.
Example 1: the method for determining the steel ball replenishing amount by controlling the power of the large-scale overflow ball mill is characterized by comprising the following steps of: (1) determining the optimal filling rate of the large overflow ball mill; (2) recording the optimal running power W of the ball mill under the optimal filling rate when the ball mill normally works1(ii) a (3) When the ball mill normally works within the rated power, adding a certain mass of steel ball delta into the ball mill1Recording the running power W of the ball mill at the moment2(ii) a (4) According to the formula Wa＝(W2-W1)/δ1Calculating the variation value of the average supplemented operation power of the ball mill per ton of steel balls, wherein WaAdding the increase value of the operating power of the ball mill in unit of kW/t to ensure WaThe accuracy of (2) is determined and calculated repeatedly three times to obtain an average value(5) Monitoring the running power Wr of the ball mill in real time and calculating W1And the difference between Wr andA ratio n of (i.e.(6) When inWhen in use, steel balls are added into the ball mill according to the practical production conditionIn the process, steel balls are required to be supplemented into the ball mill, the steel ball supplementing amount is delta a, wherein delta a is n, the unit is t, V is the effective volume of the large-scale ball mill, and the unit is m3And 4.8 is the bulk density of the steel balls in t/m3(ii) a (7) Monitoring the change of the running power of the ball mill after adding the balls, and repeating the step (5) if the change is not detectedCompleting a ball adding operation ifStep (6) is repeated.
Example 2: the difference from example 1 is that in step (4), W is ensuredaThe accuracy of (2) is determined by repeating the measurement and calculation for 4 times to obtain an average value
The concrete operation of the step (1) of the invention can refer to the Chinese patent application No. CN201310677487.2 patent name as a method for determining the filling rate of the grinding mill, the determination process adopts a filling rate reducing test period to reduce the ball load, an inflection point observation period observes the fineness change of the ground ore product, the grinding fineness required by the filling rate increasing period is adjusted back, and the best filling rate is found by a downhill method of reducing the filling rate through a field exploration production test; the grinding fineness of the grinder is taken as a control target, and the optimal filling rate is finally and comprehensively determined by the fineness and the sorting index.
The final purpose of adding the steel balls in the invention is to ensure that the filling rate of the steel balls is constant, the upper part and the lower part of the steel balls cannot exceed 2 percent points, the adding frequency mainly influences whether the mill is maintained at the optimal filling rate condition, the more the frequency is, the more accurate the frequency is, taking the production of a large-scale overflow type ball mill (with the rated power of a motor being 3300kW) with the diameter of 5.03 multiplied by 8.3m of the Chinese waxgourd cuprite, the normal operation power of the ball mill is 3100kW under the condition that the filling rate is 32 percent, and theThe steel ball filling rate is 10kW, when the running power Wr of the ball mill is monitored to be 3050kW in real time, 5t of steel balls are added into the ball mill, and when the running power Wr of the ball mill is monitored to be 3080kW in real time, 2t of steel balls are added into the ball mill in order to ensure that the steel ball filling rate of the ball mill is maintained at the optimal level.
Chinese patent application No. CN201210088934.6 discloses a dynamic system and application method for the loading capacity of a grinding body in a barrel ball mill, wherein the optimal current or power value is an inflection point value measured under automatic control, but is influenced by factors such as ore feeding granularity, ore discharging granularity, ore grinding concentration, mill filling rate, mill rotation speed rate, etc., and whether the inflection point value is a recorded value under the optimal ore grinding condition is difficult to judge, the invention determines the optimal filling rate of a large-scale overflow ball mill through targeted experimental research (i.e. the determination method for the mill filling rate mentioned above), and the power value measured under the condition is used as a reference value of normal production operation power; the change of the filling rate of the ball mill is deduced by monitoring the change of the running power of the ball mill in real time, so that the accurate tracking of the ball adding amount is realized, and the stable running of the ball mill under the condition of the optimal running power is ensured; the specific change value of the running power is used as the calculation basis of the ball adding amount, so that the good running of the mill under the condition of the optimal filling rate is ensured, and the reasonability, the scientificity and the prior operation of the ball adding means of the ball mill are realized.
The technical method is successfully applied to the wax gourd cuphan copper mine of the limited Tongling nonferrous metal group company, for example, two phi 5.03x8.3m overflow ball mills (the rated power of a motor is 3300kW) of the wax gourd cuphan copper mine are adopted, the normal operation power is 3100kW under the condition that the filling rate is 32 percent, and the ball adding amount of each time is determined by controlling the operation power of the ball mill. The ball adding method of the invention has high reliability and accuracy when adding balls in a large overflow ball mill of a mine, and particularly can further promote the automatic control of the method by utilizing the mineral separation automation technology.
The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (4)
1. The method for determining the steel ball replenishing amount by controlling the power of the large-scale overflow ball mill is characterized by comprising the following steps of: (1) determining the optimal filling rate of the large overflow ball mill; (2) recording the optimal running power W of the ball mill under the optimal filling rate when the ball mill normally works1(ii) a (3) When the ball mill normally works within the rated power, adding a certain mass of steel ball delta into the ball mill1Recording the running power W of the ball mill at the moment2(ii) a (4) According to the formula Wa＝(W2-W1)/δ1Calculating the variation value of the average supplemented operation power of the ball mill per ton of steel balls, wherein WaAdding the increase value of the operating power of the ball mill in unit of kW/t to ensure WaThe accuracy of the method can be repeatedly measured and calculated for many times to obtain an average value(5) Monitoring the running power Wr of the ball mill in real time and calculating W1And the difference between Wr andA ratio n of (i.e.(6) When inWhen in use, steel balls are added into the ball mill according to the practical production conditionIn the process, steel balls are required to be supplemented into the ball mill, the steel ball supplementing amount is delta a, wherein delta a is n, the unit is t, V is the effective volume of the large-scale ball mill, and the unit is m3And 4.8 is the bulk density of the steel balls in t/m3(ii) a (7) Monitoring the change of the running power of the ball mill after adding the balls, and repeating the step (5) if the change is not detectedcompleting a ball adding operation ifStep (6) is repeated.
2. The method for determining the amount of the added steel balls by controlling the power of the large-scale overflow type ball mill as claimed in claim 1, wherein the step (1) comprises reducing the load of the ball by using a reduced filling rate test period, observing the fineness variation of the ground ore product in an inflection point observation period, returning to the increased filling rate period to restore the required ground ore fineness, and finding the optimal filling rate by using a downhill method of the reduced filling rate through a field exploration production test; the grinding fineness of the grinder is taken as a control target, and the optimal filling rate is finally and comprehensively determined by the fineness and the sorting index.
3. The method of determining the amount of additional steel balls by controlling the power of a large overflow ball mill as set forth in claim 2, wherein said W is2、Wa、And Wr are both within the rated operating power of the ball mill.
4. A method of determining the amount of additional balls by controlling the power of a large overflow ball mill as claimed in claim 3 wherein said method is characterized in thatIs a weighted average of three or more times.
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| CN115055272A (en) * | 2022-04-29 | 2022-09-16 | 云南驰宏锌锗股份有限公司 | Method for determining optimal filling rate of medium-sized ball mill |
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| CN102600958B (en) * | 2012-03-30 | 2014-08-27 | 西安艾贝尔科技发展有限公司 | Method for controlling loadage of grinding body in cylinder type ball mill |
| CN103611619B (en) * | 2013-12-11 | 2015-08-19 | 中冶长天国际工程有限责任公司 | A kind of ore mill regulates the method and apparatus of steel ball filling rate in controlling |
| CN103721799A (en) * | 2013-12-13 | 2014-04-16 | 金川集团股份有限公司 | Determination method for filling ratio of grinding mills |
| CN104056697B (en) * | 2014-07-17 | 2016-06-08 | 山东工大中能科技有限公司 | A kind of ball mill adds ball method |
| CN105013572B (en) * | 2015-06-24 | 2017-04-05 | 太原钢铁(集团)有限公司 | A kind of a diameter of 10 meters of large-scale semi-autogenous mill ball feeding method |
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