CN105562192A - Ore dressing and classifying method - Google Patents
Ore dressing and classifying method Download PDFInfo
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- CN105562192A CN105562192A CN201610065054.5A CN201610065054A CN105562192A CN 105562192 A CN105562192 A CN 105562192A CN 201610065054 A CN201610065054 A CN 201610065054A CN 105562192 A CN105562192 A CN 105562192A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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Abstract
The invention discloses an ore dressing and classifying method. The ore dressing and classifying method comprises the following steps that ore is ground through a ball grinding mill, and ore overflowing from grids of the ball grinding mill enter a hydrocyclone to be classified; sinking sand is returned to the ball grinding mill to be ground again after being classified through the hydrocyclone, and overflowing products of the hydrocyclone enter a high-frequency vibrating screen to be classified again; and the ore of which the size is larger than the size of screen meshes of the high-frequency vibrating screen is returned to a pump sump by the high-frequency vibrating screen to be classified through the hydrocyclone, closed path classification cycle operation is completed, and undersize products of the high-frequency vibrating screen are subjected to flotation feeding. According to the ore dressing and classifying method disclosed by the invention, ore dressing and classifying are conducted on the ore conveniently, and the classification efficiency of the ore is improved.
Description
Technical field
The present invention relates to technical field of beneficiation, particularly relate to a kind of ore dressing stage division.
Background technology
Ore granularity under the effect of broken and ore grinding is tapered, and reaches monomer dissociation gradually.Elected yield ores is crossed and monomer dissociation slightly may be caused insufficient, or is difficult to flotation, crosses detailed rules and regulations can cause the choosing of argillization difficulty when ore.Therefore, the feed particle size of ore is distributed in ore dressing most important.With reference to Fig. 1, the equipment being generally used for classification in ore dressing plant is generally spiral classifier and cyclone, but such grader is difficult to realize fully effectively classification, and the water yield and mine-supplying quantity all can impact grading effect.Secondly usual classifying equipoment is vibratory sieve, and its grading effect is good, but treating capacity is less, and screen cloth is easily by bulky grain ore impact wear.
Summary of the invention
Main purpose of the present invention is to provide a kind of ore dressing stage division, is intended to conveniently carry out ore dressing classification to ore, improves its classification efficiency.
For achieving the above object, the invention provides a kind of ore dressing stage division, comprise the following steps:
Ground by ball mill by ore, the mineral that the grid of this ball mill overflows enter cyclone and carry out classification process;
Desilting after described cyclone classification returns described ball mill and again carries out milled processed, and the overflow product of cyclone enters high frequency shale shaker and carries out classification process again;
The mineral being greater than its screen size are returned to pump pond and carry out classification through cyclone by described high frequency shale shaker, complete closed circuit classification cycle operation, and the undersized product of high frequency shale shaker enters flotation to ore deposit.
Preferably, the screen size of described high frequency shale shaker is maximum optional granularity, and this maximum optional Granular Computing Methods is as follows:
Conventional flotation is carried out to ore, and screen analysis is carried out, with arithmetic mean diameter d to the raw ore of flotation, concentrate, mine tailing
arithmeticreplace particle size range, calculate the rate of recovery ε of each grain class distribution in concentrate
d,
ε
dcomputing formula is:
In formula: ε
dthe productive rate of each grain class distribution in-rougher concentration;
ε
essencethe productive rate of-rougher concentration;
ε
tailthe productive rate of-rougher tailings;
Each grain class distribution arithmetic mean diameter d is obtained according to above-mentioned formula
arithmeticcorresponding rate of recovery ε
d, obtain rate of recovery ε by the method for linear fit
dwith d
arithmeticrelation curve, and obtain according to relation curve and work as ε
dd corresponding when being 0
arithmetic, now d
arithmeticvalue is maximum optional granularity.
The ore dressing stage division that the present invention proposes, in the classification process of ore, cyclone and high frequency shale shaker are combined, one section of use cyclone classification can reduce coarse fraction mineral to greatest extent and enter two sections of high frequency shale shakers, cyclone has the large advantage for the treatment of capacity, and this is just not available for vibratory sieve, more fine-graded ore particle is easier classification after entering high frequency shale shaker, ore particle obviously alleviates the impact of screen cloth and wearing and tearing simultaneously, cyclone and high frequency shale shaker conbined usage fully compensate for respective defect, be exaggerated advantage, substantially increase classification efficiency.In addition, high frequency shale shaker on-the-sieve material is returned to pump pond and carry out classification again to enter cyclone, this kind of grade is all the insufficient material of one section of cyclone classification, when improving the classification efficiency of cyclone after classification again.
Accompanying drawing explanation
Fig. 1 is grading technology flow chart of the prior art;
Fig. 2 is the process chart of ore dressing stage division preferred embodiment of the present invention;
Fig. 3 is ε in ore dressing stage division one embodiment of the present invention
d-d
arithmeticgraph of relation.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to the process chart that Fig. 2, Fig. 2 are ore dressing stage division preferred embodiment of the present invention.
In this preferred embodiment, ore dressing stage division comprises the following steps:
Ground by ball mill by ore, the mineral that the grid of this ball mill overflows enter cyclone and carry out classification process;
Desilting after described cyclone classification returns described ball mill and again carries out milled processed, and the overflow product of cyclone enters high frequency shale shaker and carries out classification process again;
The mineral being greater than its screen size are returned to pump pond and carry out classification through cyclone by described high frequency shale shaker, complete closed circuit classification cycle operation, and the undersized product of high frequency shale shaker enters flotation to ore deposit.
Particularly, screen size value is maximum optional granularity, and maximum optional Granular Computing Methods is as follows:
Conventional flotation is carried out to ore, and screen analysis is carried out, with arithmetic mean diameter d to the raw ore of flotation, concentrate, mine tailing
arithmeticreplace particle size range, calculate the rate of recovery ε of each grain class distribution in concentrate
d,
ε
dcomputing formula is:
In formula: ε
dthe productive rate of each grain class distribution in-rougher concentration;
ε
essencethe productive rate of-rougher concentration;
ε
tailthe productive rate of-rougher tailings;
Each grain class distribution arithmetic mean diameter d is obtained according to above-mentioned formula
arithmeticcorresponding rate of recovery ε
d, obtain rate of recovery ε by the method for linear fit
dwith d
arithmeticrelation curve, and obtain according to relation curve and work as ε
dd corresponding when being 0
arithmetic, now d
arithmeticvalue is maximum optional granularity.
In the classification process of ore, one section of use cyclone classification can reduce coarse fraction mineral to greatest extent and enter two sections of high frequency shale shakers, cyclone has the large advantage for the treatment of capacity, and this is just not available for vibratory sieve, more fine-graded ore particle is easier classification after entering high frequency shale shaker, and ore particle obviously alleviates the impact of screen cloth and wearing and tearing simultaneously.Cyclone and high frequency shale shaker conbined usage fully compensate for respective defect, are exaggerated advantage, significant to the raising of classification efficiency.High frequency shale shaker on-the-sieve material returns to pump pond and enters cyclone in classification, and this kind of grade is all the insufficient material of one section of cyclone classification, when improving the classification efficiency of cyclone after classification again.Cyclone desilting can return ball mill and regrind, and all returns ball mill regrind so whole section of progressive operation final purpose is the ore particle being greater than mesh size.
In this operation, the how screen size of Rational choice high frequency shale shaker, namely determining maximum optional granularity Dxmax, is particularly important.From energy consumption, the larger energy consumption of particle diameter in mine is lower, and mineral are overground fewer, but monomer dissociation now may be caused inadequate.People are more tending towards selecting larger particle diameter on the basis meeting monomer dissociation, so determine that Dxmax is crucial.
Generally speaking, for gravity treatment, Dxmax is the bigger the better; For flotation, Dxmax determines the scope at 0.2-0.8mm, and when meeting degree of dissociation and being good, less Dxmax is larger for density, and larger Dxmax is less for density.Dxmax is substantially inapplicable for below 0.2mm, because mesh size is meticulous, screening can become very difficulty.
In the early stage in test, carry out orthogonal test of multiple factors by the factor such as Dxmax value, ball mill parameter changing high frequency shale shaker.For the disseminated grain size of different ore, tentatively determine the maximum optional granularity Dxmax of several different flotation, then determine which size Dxmax chooses according to result of the test.But, partition size composition optimum in actual flotation, relevant with the density of ore, Surface Physical Chemistry character, the many factor such as collecting power, ore pulp solution chemistry (viscosity, concentration) of floating agent to ore particle, therefore, a kind of brand-new appraisement system can be set up in conjunction with flotation raw ore, concentrate, mine tailing size data and number quality index, namely adopt linear fit to obtain the maximum optional granularity Dxmax of actual flotation.
Computational methods are: according to the roughing flotation concentrate and tailings screen analysis result of ore, with arithmetic mean diameter d
arithmeticreplace particle size range, calculate the productive rate ε that in rougher concentration, each grain class distribution is corresponding
d, this index fully can show that raw ore is at the recovering state sorting each grade in process, thus can be the granularity of zero in order to determine that maximum optional granularity Dxmax is productive rate in rough concentrate.According to ε
d-d
arithmeticrelation fitting a straight line can infer maximum optional granularity, thus provides theoretical foundation for sub-prime classification and Dxmax grading technology.
ε
dcomputing formula is:
In formula: ε
dthe productive rate of each grain class distribution in-rougher concentration;
ε
essencethe productive rate of-rougher concentration;
ε
tailthe productive rate of-rougher tailings;
The maximum optional granularity Dxmax of the data obtained is obtained by the method for linear fit, recycle the Dxmax after determining to instruct ore grinding-cyclone classification-high frequency fine screen grading technology flow process, improve classification efficiency, improve final flotation to the granularmetric composition in ore deposit, floatation indicators is significantly improved.
The ore dressing stage division that the present embodiment proposes selects factory to succeed application at Si Zhou.
Before, Si Zhou selects factory's progressive operation to adopt two sections of cyclone classifications, find that the copper content of mine tailing coarse grain is higher through small-scale test, in concentrate, coarse grain grade and the rate of recovery are not high, by analyzing the distributive law of each grade in rougher concentration and mine tailing, finding that grade its recovery thicker is more difficult, there is certain linear relationship in grade and this grain class distribution rate.
Adjust mog in this test and remain on-200 order content 55%, the screen analysis result of roughing flotation concentrate and tailings is as table 1-1, ε
d-d
arithmeticrelation result of calculation is as table 1-2.
The screen analysis result of table 1-1 rougher concentration and mine tailing
Table 1-2 ε
d-d
arithmeticrelation result of calculation
ε can be drawn by linear fit method according to table 1-2
d-d
arithmeticgraph of relation as shown in Figure 3.
According to the data in table 1-2, show that order-1 linear equation is y=-0.15867x+38.862 by the method for linear fit, with reference to Fig. 3, as y=0, x=245.Namely in the order-1 linear equation of matching, as grade copper recovery ε
dbe 0, now corresponding granularity Dxmax=0.245mm, it has reacted the ore being greater than this Dxmax granularity and has been difficult to reclaim, and Dxmax=0.25mm is chosen in practical operation conveniently technique.
Because of partition size optimum in flotation composition, relevant with the density of ore, Surface Physical Chemistry character, the many factor such as collecting power, ore pulp solution chemistry (viscosity, concentration) of floating agent to ore particle.Choose Dxmax=0.30mm, 0.25mm and 0.20mm in small-scale test to verify.Find that Dxmax=0.25mm is really more excellent, ensure that the more coarsely graded copper recovery of-80+120 order.
In commerical test, contrast former flow process hierarchical approaches and the hierarchical approaches after improving, its result is as follows:
New grading technology respectively examines or check sample, and after screen analysis, the enriched fineness situation of each sample is in Table 1-3.
The enriched fineness result of each product of the table new grading technology of 1-3
According to table 1-3, by newly-generated-200 order grades, can calculate the classification efficiency of one section of hydrocyclone, two sections of high frequency shale shakers, wherein grind grading result of calculation is in Table 1-4.
The new grading technology classification efficiency of table 1-4
Each examination sample in former grading technology flow process, through the enriched fineness distribution situation of screen analysis each sample in Table 1-5.
The enriched fineness distribution of each product of the table former grading technology of 1-5
According to table 1-5, by newly-generated-200 order grades, the classification efficiency of one section of hydrocyclone, two sections of hydrocyclones can be calculated.Wherein classification efficiency result of calculation is in Table 1-6.
The former grading technology classification efficiency of table 1-6
Contrast classification efficiency by table 1-6 known, new grading technology is compared with former mill grading technology, and total amount classification efficiency improves 25.92%, one section of classification efficiency and improves 9.90%, two sections of classification efficiencies and improve 14.58%.The small-scale test rate of recovery turn improves 0.5% on the basis of 88% simultaneously, achieves certain effect.
The ore dressing stage division that the present invention proposes, in the classification process of ore, cyclone and high frequency shale shaker are combined, one section of use cyclone classification can reduce coarse fraction mineral to greatest extent and enter two sections of high frequency shale shakers, cyclone has the large advantage for the treatment of capacity, and this is just not available for vibratory sieve, more fine-graded ore particle is easier classification after entering high frequency shale shaker, ore particle obviously alleviates the impact of screen cloth and wearing and tearing simultaneously, cyclone and high frequency shale shaker conbined usage fully compensate for respective defect, be exaggerated advantage, substantially increase classification efficiency.In addition, high frequency shale shaker on-the-sieve material is returned to pump pond and carry out classification again to enter cyclone, this kind of grade is all the insufficient material of one section of cyclone classification, when improving the classification efficiency of cyclone after classification again.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (2)
1. an ore dressing stage division, is characterized in that, comprises the following steps:
Ground by ball mill by ore, the mineral that the grid of this ball mill overflows enter cyclone and carry out classification process;
Desilting after described cyclone classification returns described ball mill and again carries out milled processed, and the overflow product of cyclone enters high frequency shale shaker and carries out classification process again;
The mineral being greater than its screen size are returned to pump pond and carry out classification through cyclone by described high frequency shale shaker, complete closed circuit classification cycle operation, and the undersized product of high frequency shale shaker enters flotation to ore deposit.
2. ore dressing stage division as claimed in claim 1, it is characterized in that, the screen size of described high frequency shale shaker is maximum optional granularity, and this maximum optional Granular Computing Methods is as follows:
Conventional flotation is carried out to ore, and screen analysis is carried out, with arithmetic mean diameter d to the raw ore of flotation, concentrate, mine tailing
arithmeticreplace particle size range, calculate the rate of recovery ε of each grain class distribution in concentrate
d,
ε
dcomputing formula is:
In formula: ε
dthe productive rate of each grain class distribution in-rougher concentration;
ε
essencethe productive rate of-rougher concentration;
ε
tailthe productive rate of-rougher tailings;
Each grain class distribution arithmetic mean diameter d is obtained according to above-mentioned formula
arithmeticcorresponding rate of recovery ε
d, obtain rate of recovery ε by the method for linear fit
dwith d
arithmeticrelation curve, and obtain according to relation curve and work as ε
dd corresponding when being 0
arithmetic, now d
arithmeticvalue is maximum optional granularity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114178044A (en) * | 2021-11-17 | 2022-03-15 | 铜陵有色金属集团股份有限公司 | Method for reasonably determining optimal effective size fraction for flotation separation |
| CN115672532A (en) * | 2022-11-01 | 2023-02-03 | 金川集团股份有限公司 | Unpowered self-weight extrusion type gravity settling separator and method for improving concentrate grade |
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| WO1990000645A1 (en) * | 1988-07-12 | 1990-01-25 | A. Ahlstrom Corporation | Method and apparatus for the removal of light material from a fiber suspension |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115672532A (en) * | 2022-11-01 | 2023-02-03 | 金川集团股份有限公司 | Unpowered self-weight extrusion type gravity settling separator and method for improving concentrate grade |
| CN115672532B (en) * | 2022-11-01 | 2024-05-03 | 金川集团镍钴有限公司 | Unpowered dead weight extrusion type gravity sedimentation separator and method for improving concentrate grade |
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Application publication date: 20160511 |