CN103721799A - Determination method for filling ratio of grinding mills - Google Patents
Determination method for filling ratio of grinding mills Download PDFInfo
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- CN103721799A CN103721799A CN201310677487.2A CN201310677487A CN103721799A CN 103721799 A CN103721799 A CN 103721799A CN 201310677487 A CN201310677487 A CN 201310677487A CN 103721799 A CN103721799 A CN 103721799A
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Abstract
The invention provides a determination method for filling ratio of grinding mills, particularly relates to a determination method for filling ratio of large-scale grinding mills. The method is characterized by including the following steps: a filling ratio-reducing experiment stage is adopted to reduce load carrying of balls, inflection point observation stage is adopted to observe fineness change of grinding products, a filling ratio-increasing stage is readjusted to recover the required grinding fineness, and a downgrade method of the filling ratio-reducing is adopted to figure out the optimal filling ratio through on-site exploration production testing during the determination process; the grinding fineness of grinding products is set as a control objective, and the optimal filling ratio is finally and comprehensively determined as per finenesses and screening indexes. According to the invention, the recovery rate is raised by over one percentage point under a circumstance that the grades of the raw ore are basically the same; the method is suitable for determination requirements for filling ratio of large-scale grinding mills, and all the grinding products have an appropriate particle size, as a result, the fineness of the grinding products is improved, and the recovery rate of valuable minerals is increased; when the method is adopted for treatment of nickel ore, the fineness, being minus 200 meshes, of the grinding products is raised by 3-4 percentage points, and the recovery rate is raised by one percentage point under a circumstance that the grades of the raw ore are basically the same.
Description
Technical field
A definite method for grinding machine pack completeness, relates in particular to a kind of definite method of large-sized grinder pack completeness.
Background technology
Ore mill in 19th century the nineties come out and enter commercial Application, because agent structure is reliable and functional being used so far, over more than 100 year there is many variations in ore mill, maximum variation is maximized no more than specification.Between more than 30 year after World War II, various countries are all manufacturing and application large mill, and to the seventies, the large mill that diameter is 4.5～6.5 meters is successful Application aborning all.The installation power of grinding machine reaches 6000～15000 horsepowers (4400～11000 kilowatts).External maximum ball mill specification D * L has reached 8250mm * 15250mm(8.25 * 15.25 meter), grinding machine installation power reaches 27000 horsepowers, (19845 kilowatts).In the past, be once called large-size ball mill by the ball mill of 3～4 meters of diameters, at present 5～6 meters of diameters also this is called large-size ball mill naturally.Domestic large-size ball mill is also with the same in the world, occur just successively and application aborning, the large-scale state-run mine concentrators such as Jiang Tong group, Jinchuan Group successful Application the large-size ball mill of 5.5 * 8.5 meters, the interim Extra large ball mill (17000 kilowatts of power) that has adopted 7.9 * 13.6 meters of newly-built Ebony Hill, Inner Mongol copper mine one.
Although large-size ball mill is successful Application at home and abroad, in Ore Dressing Engineering, to lag behind practice be common occurrence in theoretical research, is showed no application achievements and the experience introduction of relevant large-size ball mill both at home and abroad.Scattered research thinks, the grinding machine pack completeness that diameter is larger is lower, and 6 meters of above ball mill pack completeness of Φ are only 20% left and right.The ball lotus pack completeness that domestic manufactory provides is also with regard to 34～35%,
According to the steel ball motion theory of Davis-Lie Wensong, the rotational speed rate ψ of grinding machine and ball lotus pack completeness
jointly determining the motion state of steel ball, for keeping the interior whole ball lotus of mill to be, leaving formula motion state, internal layer ball lotus must have a minimum ball layer radius, and while being less than this ball layer radius, the ball lotus of core wriggles, a little less than ore grinding effect.In Extra large ball mill, pack completeness is large, and core has the wriggling state of considerable part ball lotus in ore grinding effect.The ball lotus of core just can be in the strong cast and decline movement state of ore grinding effect to a certain extent less for ball lotus, and ore grinding effect is just strong, and therefore, the requirement of steel ball motion state has limited again mill endosphere lotus pack completeness can not be large.But should see, Davis-Lie Wensong steel ball motion theory was set up in nineteen fifties, be under the steel ball prerequisite not doing to slide, to set up in mill, and ball lotus in grinding only there is ore in sand form in steel ball pack completeness more than 40% and in grinding in the situation that just can not slide.And large-size ball mill does not meet above-mentioned situation, therefore can not quantitatively calculate its pack completeness with Davis-Lie Wensong steel ball motion theory.
Summary of the invention
The object of the technology of the present invention is to provide a kind of pack completeness of grinding machine that can make and maintains a rational level, thereby improves ore milling product granularmetric composition, is conducive to grinding system energy-saving and cost-reducing, improves the definite method that is suitable for large-sized grinder pack completeness of beneficiating technology index.
The present invention by the following technical solutions to achieve these goals.
A kind of definite method of grinding machine pack completeness, it is characterized in that its deterministic process adopts subtracts pack completeness experimental period and reduces ball lotus, the flex point observation period observes ore milling product fineness and changes, readjustment increases the mog that the recovery of pack completeness phase requires, and explores pilot production look for best pack completeness by the descending method that subtracts pack completeness by scene; The mog of grinding machine of take be to be controlled target, with fineness and the best pack completeness of the last synthetic determination of sorting index.
Definite method of a kind of grinding machine pack completeness of the present invention, it is characterized in that determining that the condition of grinding machine pack completeness is as follows: maintain mill speed and ore concentration expressed in percentage by weight is adjusted grinding machine pack completeness in the reasonable scope, ore grinding rotating speed is 73%～78%, ore concentration expressed in percentage by weight is 66%～70%, and ore milling product granularity accounts for 80%～84% for-0.074mm.
Definite method of a kind of grinding machine pack completeness of the present invention, is characterized in that described grinding machine is wet overflow type ball mill.
Definite method of a kind of grinding machine pack completeness of the present invention, at mill speed and ore milling concentration constant in the situation that, make ore milling product granularity-0.074mm content bring up to 83%～84% from 77%～78%, under this ore discharge granularity, ore milling product rational size distribution, has effectively improved the sorting index of follow-up sorting operation.In the basic identical situation of head grade, more than the rate of recovery can improve one percentage point.Be suitable for large-sized grinder pack completeness provisioning request really, make ore milling product by suitable granularmetric composition, improved ore milling product fineness, improved the rate of recovery of valuable mineral.
Accompanying drawing explanation
Fig. 1 is the graph of a relation of power consumption and hold ball rate.
Ore mill power consumption, along with the increase of steel ball pack completeness starts also to increase, can reduce after the large certain peak value of increase gradually.Theoretical curve and actual curve have certain discrepancy, but actual pack completeness can be determined by the present invention.Under best pack completeness state, grinding machine available power is maximum, and ore milling product granularmetric composition is best, and sorting index is best.
Fig. 2 is grinding machine pack completeness instrumentation plan.
Fig. 2 is grinding machine cross section, the shared area of ball lotus when hachure partly represents that grinding machine is static,
for grinding machine interior diameter, measure ball lotus surface
cBEthe highest summit to grinding mill barrel
adistance be a, ball lotus surface is to the distance b at grinding machine center (now
), pack completeness is:
.
The specific embodiment
A kind of definite method of grinding machine pack completeness, described grinding machine is the ore mill that diameter is greater than 5 meters, its deterministic process adopts and subtracts pack completeness experimental period and reduce ball lotus, the flex point observation period observes ore milling product fineness and changes, readjustment increases the mog that the recovery of pack completeness phase requires, and explores pilot production look for best pack completeness by the descending method that subtracts pack completeness by scene.The mog of grinding machine of take be to be controlled target, with fineness and the best pack completeness of the last synthetic determination of sorting index.The condition of determining grinding machine pack completeness is as follows: maintain mill speed and ore concentration expressed in percentage by weight is adjusted grinding machine pack completeness in the reasonable scope, ore grinding rotating speed is 73～78%, ore concentration expressed in percentage by weight is 66～70%, and ore milling product granularity accounts for 80～84% for-0.074mm.
Described ore mill is wet overflow type ball mill.
Described ore mill is the ore mill that diameter is greater than 5 meters.
Below in conjunction with example, method of the present invention is described in further detail.But protection scope of the present invention is not limit by embodiment.
Embodiment
Yi Xuan factory of Gansu Jinchuan Non-ferrous Metals Company:
Method is:
(1) subtract pack completeness experimental period: stop daily adding, the lotus that concedes points naturally subtracts and, and pack completeness declines naturally, this stage take and guarantees that mog is as controlling target foundation, and fineness variation stops subtracting ball, recovers normally to add, and this stage is about 1 month.Pack completeness reduces to 30.00～31.00% from 35.50～37.00%.
(2) the flex point observation period: when stopping normal tip-in and proceed to mog and start variation, recover normal tip-in, and mog situation of change is observed in continuation, when fineness is stable but inadequate, illustrate that mill endosphere lotus is not enough, should increase in right amount pack completeness, pack completeness reduces to low ebb should be toward readjustment, increase pack completeness, this stage is about 1 month.Pack completeness flex point is 30.00～31.00%.
(3) readjustment increases pack completeness experimental period: reduce pack completeness to low ebb district mog variation, starting, toward readjustment, increases pack completeness, recovers the mog that requires, and this stage is about 1 month.Pack completeness is increased to 31.00～35.00%.
" U " shape curve changing by pack completeness, can determine the rational pack completeness of grinding machine, as the control target of pack completeness in producing from now on.
Before and after definite test of large mill pack completeness, comparing result is listed in the table below:
Claims (4)
1. definite method of a grinding machine pack completeness, it is characterized in that its deterministic process adopts subtracts pack completeness experimental period and reduces ball lotus, the flex point observation period observes ore milling product fineness and changes, readjustment increases the mog that the recovery of pack completeness phase requires, and explores pilot production look for best pack completeness by the descending method that subtracts pack completeness by scene; The mog of grinding machine of take be to be controlled target, with fineness and the best pack completeness of the last synthetic determination of sorting index.
2. definite method of a kind of grinding machine pack completeness according to claim 1, it is characterized in that determining that the condition of grinding machine pack completeness is as follows: maintain mill speed and ore concentration expressed in percentage by weight is adjusted grinding machine pack completeness in the reasonable scope, ore grinding rotating speed is 73%～78%, ore concentration expressed in percentage by weight is 66%～70%, and ore milling product granularity accounts for 80%～84% for-0.074mm.
3. definite method of a kind of grinding machine pack completeness according to claim 1, is characterized in that described grinding machine is wet overflow type ball mill.
4. definite method of a kind of grinding machine pack completeness according to claim 1, is characterized in that described grinding machine is the ore mill that diameter is greater than 5 meters.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107626433A (en) * | 2017-08-28 | 2018-01-26 | 铜陵有色金属集团股份有限公司冬瓜山铜矿 | Method by controlling large-scale overflowball mill power to determine to add steel ball amount |
| CN108654763A (en) * | 2017-04-01 | 2018-10-16 | 北京环磨科技有限公司 | A kind of semi-autogenous mill rationally adds method-dynamic ball adding method of steel ball |
| CN110314741A (en) * | 2018-03-29 | 2019-10-11 | 南京梅山冶金发展有限公司 | The method of precise measurement globe mill medium pack completeness |
| CN112999959A (en) * | 2021-02-08 | 2021-06-22 | 中冶长天国际工程有限责任公司 | Method and device for automatically controlling filling rate of vertical mixer |
| 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108654763A (en) * | 2017-04-01 | 2018-10-16 | 北京环磨科技有限公司 | A kind of semi-autogenous mill rationally adds method-dynamic ball adding method of steel ball |
| CN107626433A (en) * | 2017-08-28 | 2018-01-26 | 铜陵有色金属集团股份有限公司冬瓜山铜矿 | Method by controlling large-scale overflowball mill power to determine to add steel ball amount |
| CN110314741A (en) * | 2018-03-29 | 2019-10-11 | 南京梅山冶金发展有限公司 | The method of precise measurement globe mill medium pack completeness |
| CN112999959A (en) * | 2021-02-08 | 2021-06-22 | 中冶长天国际工程有限责任公司 | Method and device for automatically controlling filling rate of vertical mixer |
| CN112999959B (en) * | 2021-02-08 | 2022-06-03 | 中冶长天国际工程有限责任公司 | Method and device for automatically controlling filling rate of vertical mixer |
| 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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Application publication date: 20140416 |