CN103736603A - Mineral processing technology employing grinding classification - Google Patents
Mineral processing technology employing grinding classification Download PDFInfo
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- CN103736603A CN103736603A CN201310729568.2A CN201310729568A CN103736603A CN 103736603 A CN103736603 A CN 103736603A CN 201310729568 A CN201310729568 A CN 201310729568A CN 103736603 A CN103736603 A CN 103736603A
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Abstract
The invention provides a mineral processing technology employing grinding classification, comprising the following steps: (1) putting raw ore into a grading cyclone, settled sand of the grading cyclone enters into a ball mill to carry out ball-milling after grading, and then conveys the settled sand to the grading cyclone to continue to grade, overflow of the grading cyclone enters into a high-frequency vibrating fine screen to further grade; (2) the overflow of the grading cyclone is graded through the high-frequency vibrating fine screen, then the part below the sieve is judged as qualified aggregate, the part above the sieve enters into a dehydration cyclone to dewater; (3) the overflow of the dehydration cyclone is fed to the grading cyclone in the step (1) to continue to grade after dehydrating the part above the sieve through the dehydration cyclone, and the settled sand of the dehydration cyclone is fed to the ball mill to carry out ball milling, and then the grading cyclone is fed to in the step (1) to continue to grade. According to the mineral processing technology, the grinding classification efficiency can be improved, the infinite loop phenomenon of light mineral coarse particles in a grinding classification system is removed, and the production technology is strong in adaptability.
Description
Technical field
The present invention relates to a kind of ore-dressing technique of grind grading, more particularly, the present invention relates to a kind of ore-dressing technique of eliminating light mineral coarse granule grind grading of Infinite Cyclic in grinding classification system.
Background technology
Ore is divided into heavy mineral coarse granule, heavy mineral fine grained, light mineral coarse granule and light mineral fine grained by the large I of the thickness of particle and density.Ore grinding-classification operation of the prior art adopts the grind grading combined system being mainly comprised of classifying cyclone, high frequency vibrating fine screen and ball mill.
Fig. 1 shows the flow chart of the ore-dressing technique of grind grading of the prior art.Ore enters after classifying cyclone, and heavy mineral coarse granule enters ball mill as the sand setting of cyclone and carries out ball milling, returns to classifying cyclone again and carry out classification after ball milling; Heavy mineral fine grained, light mineral coarse granule and light mineral fine grained enter high frequency vibrating fine screen as the overflow of cyclone.After high frequency vibrating fine screen classification, lower part of screen is divided into heavy mineral fine grained and light mineral fine grained, is qualified grade, enters the sorting operation of next flow process.But, find aborning, when on the sieve of high frequency vibrating fine screen part (, light mineral coarse granule) directly enter ball mill or the goal grinding machine but enter the ore discharge pump pond of ball mill of can not flowing automatically, capital causes sieving light mineral coarse granule Infinite Cyclic in the grind grading combined system being mainly comprised of classifying cyclone, high frequency vibrating fine screen, ball mill of part, and classification efficiency is more and more lower.
Summary of the invention
The object of the present invention is to provide a kind of ore-dressing technique of grind grading, can improve the efficiency of grind grading according to the present invention, eliminate the Infinite Cyclic phenomenon of light mineral coarse granule in grinding classification system, its controlling of production process is simple, strong adaptability.
To achieve these goals, the invention provides a kind of ore-dressing technique of grind grading, described ore-dressing technique comprises the following steps: (1) is placed in classifying cyclone by raw ore and carries out classification, after classified, the sand setting of classifying cyclone enters ball mill to carry out ball milling and then sends into classifying cyclone and proceed classification, and the overflow of classifying cyclone enters high frequency vibrating fine screen and carries out further classification; (2) overflow of classifying cyclone is after described high frequency vibrating fine screen carries out classification, and lower part of screen is divided into qualified grade, sieve top divide enter dehydration cyclone dewater; (3) after sieve top lease making dehydration cyclone dewaters, the overflow classifying cyclone of sending back in step (1) of dehydration cyclone is proceeded classification, and the sand setting of dehydration cyclone is sent into ball mill and carried out the classifying cyclone that then ball milling send back in step (1) and proceed classification.
According to an aspect of the present invention, can control ore in described classifying cyclone account for the ore pulp in classifying cyclone percentage by weight 55%～60%, can control ore in described high frequency vibrating fine screen account for the ore pulp in high frequency vibrating fine screen percentage by weight 30%～35%, can control ore in described ball mill account for the ore pulp in ball mill percentage by weight 70%～75%.
According to an aspect of the present invention, in step (1), described raw ore can be the strong magnetic gold mine of vanadium titano-magnetite after the de-titanium of vanadium removal.
According to an aspect of the present invention, in step (1), described raw ore can be the ore being comprised of coarse grain and particulate obtaining after sloping plate grading, and wherein, the ore that granularity is greater than 0.1mm is coarse grain, and the ore that granularity is no more than 0.1mm is particulate.
According to the present invention, can improve the efficiency of grind grading, eliminate the Infinite Cyclic phenomenon of light mineral coarse granule in grinding classification system, its production technology strong adaptability.
Accompanying drawing explanation
Fig. 1 shows the flow chart of the ore-dressing technique of grind grading of the prior art.
Fig. 2 shows according to the flow chart of the ore-dressing technique of grind grading of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, the ore-dressing technique according to a kind of grind grading of the present invention is elaborated.But they can be implemented with different forms, and should not be construed as the embodiment that is confined to set forth here.On the contrary, providing these embodiment to make the disclosure will be thoroughly with complete, and the scope of example embodiment will be conveyed to those skilled in the art fully.
Hereinafter, will describe according to the ore-dressing technique of a kind of grind grading of exemplary embodiment of the present invention.
According to the ore-dressing technique of grind grading of the present invention, comprise the following steps: (1) is placed in classifying cyclone by raw ore and carries out classification, after classified, the sand setting of classifying cyclone enters ball mill to carry out ball milling and then sends into classifying cyclone and proceed classification, and the overflow of classifying cyclone enters high frequency vibrating fine screen and carries out further classification; (2) overflow of classifying cyclone is after described high frequency vibrating fine screen carries out classification, and lower part of screen is divided into qualified grade, sieve top divide enter dehydration cyclone dewater; (3) after sieve top lease making dehydration cyclone dewaters, the overflow classifying cyclone of sending back in step (1) of dehydration cyclone is proceeded classification, and the sand setting of dehydration cyclone is sent into ball mill and carried out the classifying cyclone that then ball milling send back in step (1) and proceed classification.
Fig. 2 shows according to the flow chart of the ore-dressing technique of grind grading of the present invention.Raw ore, after the classifying cyclone classification of step (1), enters ball mill as the heavy mineral coarse granule of the sand setting of classifying cyclone and carries out entering classifying cyclone after ball milling again and carry out classification; As heavy mineral fine grained, light mineral coarse granule and the light mineral fine grained of the overflow of classifying cyclone, enter high frequency vibrating fine screen and carry out classification.The overflow of classifying cyclone is after high frequency vibrating fine screen classification, and lower part of screen is divided into heavy mineral fine grained and light mineral fine grained, and these two kinds of particles enter the sorting operation of next flow process as qualified grade; After the dehydration of sieve top lease making dehydration cyclone, as the light mineral coarse granule of sand setting of dehydration cyclone, entering ball mill carries out ball milling and then enters classifying cyclone classification, as the water of overflow of dehydration cyclone and a small amount of fine grained, ore pulp adds water when carrying out ball milling mainly as ball mill.Here, the classification of ore is performed as follows: it is heavy mineral that proportion is greater than the ore of 2.9 tons/cubic metre, and it is light mineral that proportion is no more than the ore of 2.9 tons/cubic metre; The ore that granularity is greater than 0.1mm is coarse granule, and the ore that granularity is no more than 0.1mm is fine grained.
In step (1), raw ore is placed in to classifying cyclone and carries out classification, object is before raw ore is sent into ore mill, first fine fraction qualified in raw ore is divided away.When in raw ore, qualified grain size content exceedes 15%, first adopt classifying cyclone to carry out classification and can avoid fine grain mistake to pulverize, prevent the harmful effect of argillization to classification process.
According to one embodiment of present invention, in step (1), control ore in described classifying cyclone account for the ore pulp in classifying cyclone percentage by weight 55%～60%.When the weight percent content of ore in classifying cyclone higher than ore pulp 60% or lower than 55% of ore pulp, all will affect the classification efficiency of classifying cyclone.If pulp density is little, the viscosity of ore pulp also decreases, and therefore the sinking speed of ore particle is also accelerated thereupon, and the overflow product granularity obtaining is also just thin; If the concentration of ore pulp is large, the granularity of overflow product will be more slightly.But, after pulp density is reduced to a certain degree, if pulp density continues to reduce, can make on the contrary the chap of overflow product granularity.This be because, when pulp density reduces when a lot, the volume of ore pulp (or ore pulp amount) is also very large, and the flow rate of pulp (upflow velocity and horizontal flow velocity) in grader is also increased thereupon, therefore, thicker ore particle is also punched in overflow product and goes.Therefore, in the present invention, the pulp density (that is, ore accounts for the weight percent content of ore pulp) of controlling in classifying cyclone is 55%～60%.According to the present invention, the ore entering in ball mill in classifying cyclone can make the pulp density in classifying cyclone reach 70%～75%, therefore can reduce by moisturizing the concentration of ore pulp in classifying cyclone, makes its pulp density reach 55%～60%.
In step (1), according to one embodiment of present invention, raw ore can be the strong magnetic gold mine of vanadium titano-magnetite after the de-titanium of vanadium removal.According to still another embodiment of the invention, raw ore can be the ore being comprised of coarse granule and fine grained obtaining after sloping plate grading, and wherein, the ore that granularity is greater than 0.1mm is coarse granule, and the ore that granularity is no more than 0.1mm is fine grained.But the invention is not restricted to this, other that raw ore can also be known to those skilled in the art need to carry out the ore of grinding grading technique.
In step (2), high frequency vibrating fine screen carries out classification by the granularity of ore particle to ore, during production, can to the aperture of high frequency vibrating fine screen, regulate according to required granularity rank.If ore grain size is greater than the aperture of high frequency vibrating fine screen, this part ore is the upper part of sieve, if ore grain size is less than the aperture of high frequency vibrating fine screen, this part ore is that lower part of screen is divided.Because high frequency vibrating fine screen is to carry out classification by the granularity of ore particle, be subject to hardly the impact of ore density, therefore can guarantee higher classification efficiency.
According to one embodiment of present invention, in step (2), control ore in high frequency vibrating fine screen account for the ore pulp in high frequency vibrating fine screen percentage by weight 30%～35%.If the weight percent content of ore higher than ore pulp 35% or lower than 30% of ore pulp, all will affect the classification efficiency of high frequency vibrating fine screen.Specifically, if pulp density is too high, will cause screening efficiency to reduce; Conventionally pulp density is less within the specific limits, and classification efficiency is higher.But if pulp density, lower than certain value, can reduce classification efficiency on the contrary, this is because the little content that can reduce valuable rock of pulp density.If the percentage by weight of pulp density is 55%～60% in classifying cyclone, in the overflow of classifying cyclone, pulp density is generally not less than 30%～35%, the concentration that therefore can reduce by moisturizing ore pulp in high frequency vibrating fine screen, the percentage by weight that makes its pulp density is 30%～35%.
In step (3), dehydration cyclone is mainly used in effective dehydration of various mineral slurry, avoids the loss of valuable mineral, and the overflow water of dehydration cyclone is after sedimentation, re-uses escapable cost.
According to one embodiment of present invention, in step (1) and step (3), control ore in ball mill account for the ore pulp in ball mill percentage by weight 70%～75%.When the content of solid ore particle in ore pulp is higher, ore pulp viscosity is larger, and the ore particle of medium adhesion is around also many, and the probability that medium hit and ground ore particle increases, and grinding efficiency improves.But, ore milling concentration can not be too high, otherwise by greatly reducing the impulsive force of medium and grinding activity, reduce grinding efficiency; And pulp density is too large, fluidity of slurry is poor, and coarse-grained material sinks slowly, and overflowball mill is easily run out of coarse sand, and grate ball mill obstruction may occur and causes " swollen tripe ".On the other hand, when pulp density is lower, the effective density of medium in ore pulp is larger, and during whereabouts, impulsive force is stronger, but ore pulp viscosity is lower, adheres to ore particle on dielectric surface less, and abrasive action reduces, and the abrasion of medium and liner plate increase; Meanwhile, when pulp density is lower, the fine grained in overflowball mill also easily avales, and the mistake of generation is pulverized more.
In the prior art, on the sieve of high frequency vibrating fine screen, partly entering classifying cyclone carries out classification (as shown in Figure 1) or directly enters ball mill carrying out ball milling again.When part on the sieve of high frequency vibrating fine screen enters classifying cyclone again, carry out classification meeting and cause light mineral coarse granule Infinite Cyclic in grinding classification system; If partly directly entering ball mill carries out ball milling on the sieve of high frequency vibrating fine screen, can reduce the pulp density in ball mill, thereby reduce the classification efficiency of ore.But, according to the present invention, by increase dehydration cyclone in grind grading combined system, after being dewatered, the sieve top lease making dehydration cyclone of high frequency vibrating fine screen enters again ball mill, thereby improved the pulp density in ball mill, and then improved the grinding efficiency of ball mill.In addition, according to the present invention, the overflow of dehydration cyclone is water and a small amount of fine grained, if when the pulp density in ball mill is too high, the overflow of dehydration cyclone when carrying out ball milling mainly as ball mill ore pulp add water.According to the present invention, the percentage by weight that the ore in ball mill accounts for ore pulp in ball mill can regulate by the overflow of dehydration cyclone.According to the percentage by weight of pulp density in one exemplary embodiment of the present invention control ball mill, be 70%～75%.
Example
Adopt method of the present invention to carry out ore dressing to raw ore, wherein, in raw ore, to be less than the ore content of 0.074mm be 30% to ore grain size.As shown in Figure 2, after the classified cyclone classification of raw ore, in the overflow of classifying cyclone, to be less than the ore content of 0.074mm be 52% to ore grain size, after high frequency vibrating fine screen classification, it is 67% that the ore content that middle ore grain size is less than 0.074mm is divided in lower part of screen, and on sieve, to be less than the ore content of 0.074mm be 6% to part chats stone granularity.Operation is after 2 months continuously, after classified cyclone classification, in the overflow of classifying cyclone, to be less than the ore content of 0.074mm be 53% to ore grain size, after high frequency vibrating fine screen classification, it is 68% that the ore content that middle ore grain size is less than 0.074mm is divided in lower part of screen, and on sieve, to be less than the ore content of 0.074mm be 6% to part chats stone granularity.
Therefore, adopt the ore-dressing technique of grind grading provided by the invention to carry out ore dressing, classifying cyclone, high frequency vibrating fine screen classification efficiency are substantially constant.
Comparative example
Adopt prior art to carry out ore dressing to raw ore, wherein, in raw ore, to be less than the ore content of 0.074mm be 30% to ore grain size.As shown in Figure 1, after the classified cyclone classification of raw ore, in the overflow of classifying cyclone, to be less than the ore content of 0.074mm be 48% to ore grain size, after high frequency vibrating fine screen classification, it is 65% that the ore content that middle ore grain size is less than 0.074mm is divided in lower part of screen, and on sieve, to be less than the ore content of 0.074mm be 7% to part chats stone granularity.Operation is after 2 months continuously, after classified cyclone classification, in the overflow of classifying cyclone, to be less than the ore content of 0.074mm be 41% to ore grain size, after high frequency vibrating fine screen classification, it is 59% that the ore content that middle ore grain size is less than 0.074mm is divided in lower part of screen, and on sieve, to be less than the ore content of 0.074mm be 12% to part chats stone granularity.
By by example of the present invention with according to the comparative example of prior art, contrast and can find, adopt the ore-dressing technique of grind grading of prior art to carry out ore dressing, the classification efficiency of classifying cyclone and high frequency vibrating fine screen is obviously reduction after a period of time.Adopt the ore-dressing technique of grind grading provided by the invention to carry out ore dressing, the classification efficiency of classifying cyclone and high frequency vibrating fine screen is substantially constant after a period of time.Therefore, according to the present invention, can improve the efficiency of grind grading, eliminate the Infinite Cyclic phenomenon of light mineral coarse granule in grinding classification system, its production technology strong adaptability.
Although described some embodiments of the present invention, it should be appreciated by those skilled in the art that in the case of not departing from by claim and equivalent thereof and limit the principle of the present invention and spirit of its scope, can modify to these embodiment.
Claims (4)
1. an ore-dressing technique for grind grading, described ore-dressing technique comprises the following steps:
(1) raw ore is placed in to classifying cyclone and carries out classification, classified after, the sand setting of classifying cyclone enters ball mill to carry out ball milling and then sends into classifying cyclone and proceed classification, the overflow of classifying cyclone enters high frequency vibrating fine screen and carries out further classification;
(2) overflow of classifying cyclone is after described high frequency vibrating fine screen carries out classification, and lower part of screen is divided into qualified grade, sieve top divide enter dehydration cyclone dewater;
(3) after sieve top lease making dehydration cyclone dewaters, the overflow classifying cyclone of sending back in step (1) of dehydration cyclone is proceeded classification, and the sand setting of dehydration cyclone is sent into ball mill and carried out the classifying cyclone that then ball milling send back in step (1) and proceed classification.
2. ore-dressing technique according to claim 1, it is characterized in that, control ore in described classifying cyclone account for the ore pulp in classifying cyclone percentage by weight 55%～60%, control ore in described high frequency vibrating fine screen account for the ore pulp in high frequency vibrating fine screen percentage by weight 30%～35%, control ore in described ball mill account for the ore pulp in ball mill percentage by weight 70%～75%.
3. ore-dressing technique according to claim 1, is characterized in that, in step (1), described raw ore is the strong magnetic gold mine of vanadium titano-magnetite after the de-titanium of vanadium removal.
4. ore-dressing technique according to claim 1, is characterized in that, in step (1), described raw ore is the ore being comprised of coarse granule and fine grained obtaining after sloping plate grading, wherein, the ore that granularity is greater than 0.1mm is coarse granule, and the ore that granularity is no more than 0.1mm is fine grained.
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| CN104492615A (en) * | 2014-10-31 | 2015-04-08 | 四川安宁铁钛股份有限公司 | Grinding classification method |
| CN108160312A (en) * | 2017-12-08 | 2018-06-15 | 南丹县南方有色金属有限责任公司 | A kind of granularity control technique during leached mud choosing silver |
| CN112892854A (en) * | 2020-12-24 | 2021-06-04 | 攀钢集团矿业有限公司 | Method for recovering ilmenite from iron ore dressing tailings containing olivine or pyroxene vanadium titano-magnetite |
| CN113019723A (en) * | 2021-03-29 | 2021-06-25 | 抚顺罕王傲牛矿业股份有限公司 | High-efficiency ore grinding and grading process for solving dehydration of products on high-frequency sieve |
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| CN113019723A (en) * | 2021-03-29 | 2021-06-25 | 抚顺罕王傲牛矿业股份有限公司 | High-efficiency ore grinding and grading process for solving dehydration of products on high-frequency sieve |
| CN113019723B (en) * | 2021-03-29 | 2022-04-01 | 抚顺罕王傲牛矿业股份有限公司 | High-efficiency ore grinding and grading process for solving dehydration of products on high-frequency sieve |
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