CN104226466A - Numerical-control operation method for grading of ground ores in closed-loop ore grinding system - Google Patents
Numerical-control operation method for grading of ground ores in closed-loop ore grinding system Download PDFInfo
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- CN104226466A CN104226466A CN201410482781.2A CN201410482781A CN104226466A CN 104226466 A CN104226466 A CN 104226466A CN 201410482781 A CN201410482781 A CN 201410482781A CN 104226466 A CN104226466 A CN 104226466A
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Abstract
The invention discloses a numerical-control operation method for grading of ground ores in a closed-loop ore grinding system. The numerical-control operation method comprises the following steps of (1) controlling the ore feeding amount; (2) controlling the concentration in the ore grinding machine and improving the ore grinding efficiency; (3) adjusting the concentration of overflown ore slurry of a grading machine by measured results and calculated results. In the step (1), when the rate of the instantaneous circulating load measured and calculated a-c/b-a/b-1/c-1 is smaller than Creturn/F, the ore feeding amount is increased to increase the sand return rate. The numerical-control operation method disclosed by the invention has the advantages that since the circulating load rate is controlled, that is to say, the staying time of the ores in the ore grinding machine, i.e., the flowing speed of the ores in the ore grinding machine, is controlled, not only can the generation of the superfine grain size in the ore grinding process be reduced, but also the generation of coarse grains can be avoided; the process is simple, and the production cost is low; the ore grinding efficiency is improved and the power consumption is reduced.
Description
Technical field
The present invention relates to the numerical control operating method of grind grading in a kind of closed circuit grinding system.
Background technology
As the saying goes, seven points of ore grindings, three points of flotation, refer to the ore dressing plant that medicament has finalized the design almost, the importance of ore grinding-classification work.The object of ore grinding be to make the useful component in ore all or major part reach monomer separation, avoid " overground " phenomenon again simultaneously as far as possible, and the granularity of sorting operation requirement can be reached, so that the useful component effectively reclaimed in ore for sorting operation creates conditions.Phenomenon that in closed circuit grinding system, sand return than excessive, and when having exceeded the normal handling capacity of ore mill, there will be in ore milling product " running thick ".And sand return is than too small, or there is no sand return, then easily caused crushing phenomenon.And for example load is excessive, then in ore milling product, " race is thick " phenomenon is serious, and underload, then cross and pulverize seriously.Therefore, to require during frosted to ore deposit evenly, stable.The little raising that all can affect grinding efficiency time large during mine-supplying quantity.Screen analysis Huanren Copper and Zinc Mining Plant, Liaoning Prov. tailing, the particulate of less than 35 microns accounts for insufficient total amount 20%, but accounts for 60% of tailing cupric, and even more than 60%, described fine-graded generation, not only wasted electric energy, and also made valuable metal can not effective backwater.In order to improve metal recovery rate, saving electric energy, should be to greatest extent during the ratio of the optimum cycle duty ratio selected.
Summary of the invention
The object of this invention is to provide the numerical control operating method of grind grading in a kind of high efficiency closed circuit grinding system.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
The numerical control operating method of grind grading in closed circuit grinding system, comprises the following steps:
1. mine-supplying quantity is controlled;
2. control ore mill concentration inside, improve grinding efficiency;
3. by measurement, result of calculation, adjustment classifier overflow pulp density.
Described step 1. in as the moment circulating load ratio a-c/b-ab-1/c-1<C of survey calculation
returnduring/F, then increase mine-supplying quantity, to improve sand return ratio.
The advantage that the present invention has and effect are:
1, in closed circuit grinding system of the present invention the numerical control operating method of grind grading because control circulating load ratio, namely control the time of staying of ore in ore mill, the i.e. flow velocity of ore in ore mill, therefore can reduce in grinding process and cross fine-graded generation, be unlikely to again " running thick ".
2, the numerical control operating method of grind grading in closed circuit grinding system of the present invention is taked, circulating load ratio, frosted concentration, classifier overflow pulp density, fineness can be made, all the time can drift about up and down in predetermined optimum value, if predetermined value is placed on the upper critical line of fluctuation range, so, in production process, per minute is per second, and above-mentioned value will approach to criticality line.
3, take the numerical control operating method of grind grading in closed circuit grinding system of the present invention, not only reduce the work of skilled worker.But also provide best product for sorting of next stage; Improve metal recovery rate; Reduce the pollution of valuable metal to environment; Meanwhile, save electric energy, decreased iron ball, the consumption of plate, achieved many things at one stroke.
4, in closed circuit grinding system, the numerical control operating method of grind grading carries out control automatically in grinding process, the manual operation present with China is compared, milling capacity can improve 10%-15%, present photograph 10% is calculated, if whole nation process nonferrous metallic ores and iron ore have 1,200,000,000 tons-1,300,000,000 tons every year, ore ore grinding per ton about exhausts 35 degree of electricity, if there are 700,000,000 tons of ores to have employed numerical control ore grinding technology, just can economize on electricity 2,400,000,000 degree, be worth more than 20 hundred million RMB.
5, in closed circuit grinding system of the present invention, the numerical control operating method technique of grind grading is simple, and production cost is low; Improve grinding efficiency, reduce power consumption.
Detailed description of the invention
In closed circuit grinding system: grader sand return amount is C
return true, unit is: kg/minute; Circulating load ratio and sand return are than being C
return true/ F
very; Deserve to be called at belt that to obtain mine-supplying quantity be F
very, unit is: kg/minute; In grader, detecting ore mill to ore deposit pulp density is a; Grader propeller upwards pushes away, and end pulp density is b; Classifier overflow pulp density is c.Wherein: the pulp density that a, c are 2 obtains by measuring, and the density of b point is selected, because the gradient that grader tilts is fixing, when spiral is boosted, page wheel speed is constant.So the pulp density at b place is usually at 85%--87%, when ore variable density is very little, b just can select a fixing value, when ore variable density is larger, and can with a 500cm
3namely the graduated cylinder of 500 milliliters, samples from belt, measures ore density at that time very easily.A displacement b value in computer.Here a value, b value, C return very/and F value is all the relative value drawn through repetition many times in process of production, repeating C and return very/F true time has best overflow pulp particle size range and the highest grinding efficiency.Measure C to return very/F and be really worth, input computer, just obtains the value of transient cycle duty ratio a few second, and when returning control to ore grinding-classification, every 5 minutes once just enough.
1, control mine-supplying quantity: when overflow pulp concentration is constant, circulating load is larger than ratio, and in overflow product, ore particles is thicker, otherwise circulating load is than less, and classifier overflow product ore particles is thinner.Therefore increase the ratio of circulating load ratio in operating process as much as possible, should units separate be reached, no longer overground, the optimal granularity scope of hypomere operation can be ensured again, a given best C in advance in computer
returnthe value of/F, as the moment numerical value a-c/b-ab-1/c-1>C of survey calculation
returnduring/F, then reduce mine-supplying quantity, to reduce sand return ratio.On the contrary, as the moment circulating load ratio a-c/b-ab-1/c-1<C of survey calculation
returnduring/F, then increase mine-supplying quantity, to improve sand return ratio.In this process, because the composition of ore and physical property very large on the impact of ore grinding technical efficiency.When valuable mineral granularity in ore is comparatively thick, loosely organized crisp soft time, more easily grind.And when the disseminated grain size of valuable mineral attenuate, compact structure and hardness larger time, then more difficult mill.In general coarse fraction is easier to when roughly grinding, and produce the speed of release mesh, fine grinding is then more difficult.Because along with the fragile face also corresponding minimizing of the reduction material of granularity, namely become more and more firmer, so the speed producing release mesh is also just slower.Because the ore in ore dressing plant is from different near coal-mine and locations, grindability is different, and therefore, if ore grinds well, multiprocessing is a little, is unlikely to overground; The ore of bad mill grinds less, is unlikely to run slightly.But want the ratio of constant optimum cycle duty ratio.
2, ore mill concentration inside is controlled, improve grinding efficiency: in simple closed circuit grinding system, detect the data of one section of mill entrance a, one section of grinding machine outlet b, two sections of c tri-place, pump ponds " filling up area ", calculate the value of a-c/b-ab-1/c-1, if belt claims mine-supplying quantity to be F at that time
very, sand return amount C
return true, then:
C
return true/ F
very=a-c/b-ab-1/c-1; C
return true=a-c/b-ab-1/c-1F
very;
C
return true/ C
return truethe pulp density at+water 3=86%, b place is usually at 85%--87%, and the present embodiment selects mean value 86%.
Water
3=C
return true(1-0.86)/0.86; Water
3referring to a small amount of moisture content comprised at that time in sand return, is the numerical value embodied in computer; Water
1being impact sand return water used, is a fixing numerical value; Water
4adjust ore mill concentration inside water consumption; Water
2do not enter ore mill inside.The ore deposit amount of supposing to enter at that time ore mill is Q, then Q=C
return true+ F
very; Suppose a certain ore, the best ore milling concentration of a certain ore mill is 75%, to obtain final product:
Q/Q+ (water 1+ water
3+ water
4)=75%; Water
4=(1-0.75) Q/0.75-water 1-water
3, the calculating water outlet of computer meeting timing
4amount, can adjust ore grinding at every moment towards best concentration inside value 75% convergence, approach towards grinding efficiency ceiling for accumulation.
3, by measurement, result of calculation, adjustment classifier overflow pulp density:
C
dense=Γ (c-1)/C (Γ-1); C
densefor classifier overflow pulp density; Γ is ore density, if the variable density of ore is little, just by the averag density of the dry ore measured already, if ore variable density is large, just samples on travelling belt, measures the proportion of wet ore with 500 milliliters of graduated cylinders.C is moment overflow pulp density.C
dense=F
very/ F
very+ water
5; Water
5=F
very(1-C
dense)/C
dense.F
verybe the mine-supplying quantity that deserves to be called of belt at that time, represent by kg/minute, the water calculated
5be the water content in overflow product, represent by kg/minute.Water during operation
2adjust overflow pulp concentration.Suppose that optium concentration is 39%, when the result measured is 38%, refer to t
0-t
1in the moment, now use water
2-Δ water
2t
0make pulp density to 39% convergence, the next moment is t
1-t
2in the moment, the result of measurement is 40%, now water
2=water
5-water
1-water
4-water
3.Use water
2+ Δ water
2t
2amount of water make classifier overflow ore pulp to 39% convergence.
Claims (2)
1. the numerical control operating method of grind grading in closed circuit grinding system, is characterized in that comprising the following steps:
1. mine-supplying quantity is controlled;
2. control ore mill concentration inside, improve grinding efficiency;
3. by measurement, result of calculation, adjustment classifier overflow pulp density.
2. the numerical control operating method of grind grading in closed circuit grinding system according to claim 1, is characterized in that the moment circulating load ratio a-c/b-ab-1/c-1<C when survey calculation during described step 1.
returnduring/F, then increase mine-supplying quantity, to improve sand return ratio.
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| CN201410482781.2A CN104226466B (en) | 2014-09-19 | 2014-09-19 | The numerical control operating method of grind grading in closed circuit grinding system |
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| CN104226466B CN104226466B (en) | 2017-08-11 |
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|---|---|---|---|---|
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| UA59644C2 (en) * | 2002-11-05 | 2005-04-15 | Univ Kirovohrad Nat Technical | Method of automatic stabilization of rarefaction of pulp in the mills with circulating load |
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| UA59644C2 (en) * | 2002-11-05 | 2005-04-15 | Univ Kirovohrad Nat Technical | Method of automatic stabilization of rarefaction of pulp in the mills with circulating load |
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