CN111659528B - Lean ore processing method based on high-pressure roller mill - Google Patents
Lean ore processing method based on high-pressure roller mill Download PDFInfo
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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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
Abstract
The invention relates to a lean ore processing method based on a high-pressure roller mill, which comprises the steps of obtaining lean ore to be processed, wherein the granularity of the lean ore is 30mm; conveying the lean ores to a feeding port of a high-pressure roller mill to obtain first crushed ores, wherein the granularity of the first crushed ores is less than or equal to 30mm; conveying the first crushed ore to a feeding port of a wet sieve, conveying second crushed ore remained on the wet sieve to a feeding port of the high-pressure roller mill after the wet sieve vibrates at high frequency, and conveying the second crushed ore to a third crushed ore passing through the wet sieve; and adding the third crushed ore into a medium-field strong magnetic separator to separate magnetic minerals and non-magnetic minerals. According to the lean ore processing method based on the high-pressure roller mill, provided by the embodiment of the invention, the corresponding single quality standard is established for the iron contents of the first crushed ore, the second crushed ore and the third crushed ore, so that the magnetic minerals in the lean ore are separated as much as possible, and the content of the magnetic substances in the tailings is reduced.
Description
Technical Field
The invention relates to the field of mineral processing, in particular to a lean ore processing method based on a high-pressure roller mill.
Background
In recent years, the demand of iron ore is getting larger and larger, while rich ore or richer iron ore can not meet the market requirement, the development and utilization of lean ore and ultra-lean iron ore are more and more emphasized, then because the content of strong magnetic iron mineral in the lean ore is lower, if a mode of directly grinding and then carrying out magnetic separation after raw ore crushing is adopted, because a large amount of waste rock may exist after the raw ore crushing, the grinding cost of a grinding mill is increased, and the whole lean ore processing process is higher in cost and lower in efficiency.
In the related technology, the granularity of a product obtained by crushing raw ore in a crushing workshop is about 30mm, then dry pre-selection is adopted, the granularity of thrown tailings and waste rocks is about 0-30mm, the grade of tailings mFe is high and can reach 4.97%, the tailings cannot be directly discarded, and the tailings need to be stockpiled in a tailing plant.
In the processing process, the equipment cannot reduce the mFe grade in the waste tailings, so that the discarding standard cannot be met, and the iron ore resource cannot be utilized.
Disclosure of Invention
Therefore, the lean ore processing method based on the high-pressure roller mill provided by the invention can greatly reduce mFe grade of tailing waste rocks and reach the discarding standard.
In order to achieve the above object, the present invention provides a lean ore processing method based on a high pressure roller mill, comprising: obtaining lean ore to be processed, wherein the granularity of the lean ore is 30mm smaller; conveying the lean ores with the total mass of A to a feeding port of a high-pressure roller mill to obtain first crushed ores, wherein the granularity of the first crushed ores is less than or equal to 30mm, and the number of the first crushed ores is N1; conveying the first crushed ore to a feeding port of a wet sieve, conveying second crushed ore with the total mass of B remained on the wet sieve to the feeding port of the high-pressure roller mill after the wet sieve vibrates at high frequency, wherein the quantity of the second crushed ore is N2, third crushed ore with the total mass of C passes through the wet sieve, and the quantity of the third crushed ore is N3; adding the third crushed ore into a high-intensity magnetic separator to separate magnetic minerals and non-magnetic minerals; setting lean ores with different iron contents, adopting different single ore quality standards for each crushed ore discharged by the high-pressure roller mill and the wet sieve, and setting a matrix Q (di, M1i, M2i and M3i) of the iron contents and the single ore quality, wherein di represents the iron content of the corresponding lean ore, M1i represents the single quality standard of the first crushed ore corresponding to the iron content of a certain lean ore, M2i represents the single quality standard of the second crushed ore corresponding to the iron content of a certain lean ore, and M3i represents the single quality standard of the third crushed ore corresponding to the iron content of a certain lean ore; among the N1 first crushed ores, m of the N1 first crushed ores meet the single quality standard of the first crushed ores, N of the N first crushed ores meet the single quality standard of the second crushed ores, l of the N first crushed ores meet the single quality standard of the third crushed ores, m is less than or equal to N1, N is less than or equal to N2, and l is less than or equal to N3; setting a processing efficiency E using a calculation formula of E = k1 × (mass sum of m first crushed ores/a) + k2 × (mass sum of n second crushed ores/B) + k3 × (mass sum of l third crushed ores/C), where k1+ k2+ k3= 1; and if the lean ore processing efficiency is lower than the preset standard E0 in the lean ore processing process, reducing the workload of the lean ore processing equipment and reducing the total weight A of the lean ore conveyed to the feed inlet of the high-pressure roller mill.
Further, if the lean ore processing efficiency is lower than the preset standard E0 in the lean ore processing process, the total weight of the lean ore conveyed to the feeding port of the high-pressure roller mill is reduced to 0.95A of the total weight for the first time, the processing efficiency E is recalculated, and if the lean ore processing efficiency is lower than the preset standard E0, the total weight is reduced to 0.95x0.95A for the second time, and the like.
Further, k1 is set equal to 0.2, k2 is set equal to 0.2, and k3 is set equal to 0.6.
Further, the number of the first crushed ores N1, the number of the second crushed ores N2 and the number of the third crushed ores N3 are measured by arranging corresponding infrared sensors, the number of the crushed ores in the area of the unit weight part is measured, the number of the crushed ores in the unit weight part is obtained, and then the obtained number is converted into the number of the crushed ores in the corresponding weight part.
Further, d1 represents that the iron content of the lean ore is 70-60%, d2 represents that the iron content of the lean ore is 60-50%, d3 represents that the iron content of the lean ore is 50-40%, d4 represents that the iron content of the lean ore is 40-30%, d5 represents that the iron content of the lean ore is 30-20%, d6 represents that the iron content of the lean ore is 20-10%, and d7 represents that the iron content of the lean ore is 10-0;
the M11, M12, M13, M14, M15, M16 and M17 are reduced in sequence;
the M21, M22, M23, M24, M25, M26 and M27 are reduced in sequence;
the M31, M32, M33, M34, M35, M36 and M37 are reduced in sequence.
Further, before obtaining the lean ore to be processed, the method further comprises the following steps: adding the rich ore or the lean ore into a coarse crusher and a medium crusher in sequence.
Further, conveying the magnetic minerals to a coarse magnetic separator that separates the magnetic minerals into coarse-sized matter and fine-sized matter; conveying the coarse-grained substances to a linear vibrating screen, conveying iron ore concentrate which passes through the linear vibrating screen to a specified position by using a slurry pump and a ceramic pipe, and conveying coarse ore concentrate which does not pass through the linear vibrating screen; adding the rough concentrate into a ball mill for polishing, adding the rough concentrate into a first spiral classifier, adding the separated third mineral which does not meet the separation standard into the ball mill again for polishing, carrying out first magnetic separation on the separated third mineral which meets the separation standard through a first magnetic separator, obtaining a fourth mineral and first tailings through the first magnetic separation, and adding the fourth mineral into a first cyclone to obtain a fifth mineral and a sixth mineral; adding the fifth mineral into two magnetic separators connected in series, adding the sixth mineral into a first mill and a second mill respectively, and returning the sixth mineral passing through the second mill to the cyclone again; the first mill is connected with a second cyclone, the sixth minerals sequentially pass through the first mill and the second cyclone, the second cyclone is connected with a second magnetic separator, the first magnetic separator and the second magnetic separator obtain second tailings and seventh minerals, and the seventh minerals obtain iron ore concentrates after passing through a third cyclone, a third magnetic separator, a fourth magnetic separator and a fifth magnetic separator.
Further, the first tailings and the second tailings are separated into final tailings and tailings residues through a tailings recycling magnetic separator, the tailings residues are added into the first spiral classifier, and the final tailings are pumped into a concentration tank through a tailings pump.
Further, the fine-grained matter passes through a cyclone classifier to obtain settled sand and overflow, the overflow is added into the third cyclone, and the settled sand is added into a second grinding machine.
Further, the iron ore concentrate is transported to a predetermined position by a slurry pump.
Further, the conveying tool is a conveying adhesive tape.
Compared with the prior art, the lean ore processing method based on the high-pressure roller mill has the advantages that the corresponding single quality standard is established for the iron content of the first crushed ore, the second crushed ore and the third crushed ore, so that the magnetic minerals in the lean ore are separated as much as possible, the content of the magnetic substances in tailings is reduced, and in addition, a closed-loop crushed ore flow for returning the second minerals with the granularity not meeting the requirement to the inlet of the high-pressure roller mill is arranged between the wet sieve and the high-pressure roller mill, so that the processing is facilitated; in the machining process, the machining efficiency and the preset standard are set, the machining amount can be adjusted and distributed conveniently according to the machining efficiency, more lean ores are machined by the equipment with high machining efficiency, less machining share is borne by the equipment with low machining efficiency, and the overall machining efficiency of a machining site is improved.
Further, the iron content of lean ores is graded into 7 grades, and the quality standard of crushed ores with high iron content is set to be larger in the specific application process, so that the actual times of crushing can be reduced in the actual operation process, the extraction efficiency of magnetic substances is improved, and the subsequent other operations are facilitated.
Further, the processing method of the lean ore based on the high-pressure roller mill provided by the embodiment of the invention has the advantages that the processing of the magnetic substances is finer, the extraction purity of the iron ore in the lean ore is higher, more iron ore concentrates can be extracted from the iron ore in unit mass due to higher purity, and the metal recovery rate of the lean ore is greatly improved.
Furthermore, the crushing process is optimized, effective waste disposal is realized, the production shows that the mFe grade of the pre-selected tailings is reduced to below 1.31 percent, and the recovery rate of mFe reaches above 95 percent.
Drawings
FIG. 1 is a flow chart of a lean ore processing method based on a high pressure roller mill according to the present invention;
fig. 2 is a schematic working process diagram of the lean ore processing method based on the high-pressure roller mill provided by the embodiment of the invention;
fig. 3 is a schematic diagram of the fine working process of the lean ore processing method based on the high-pressure roller mill according to the embodiment of the invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the lean ore processing method based on the high-pressure roller mill according to the embodiment of the present invention includes:
s110, obtaining lean ores to be processed, wherein the granularity of the lean ores is 30mm;
s120, conveying the lean ore to a feeding port of the high-pressure roller mill to obtain first crushed ore, wherein the granularity of the first crushed ore is less than or equal to 30mm;
s130, conveying the first crushed ore to a feeding port of a wet sieve, conveying the second crushed ore remained on the wet sieve to a feeding port of a high-pressure roller mill after the wet sieve vibrates at high frequency, and conveying the second crushed ore to a third crushed ore through the wet sieve;
s140, adding the third crushed ore into a high-intensity magnetic separator to separate magnetic minerals and non-magnetic minerals;
setting lean ores with different iron contents, adopting different single ore quality standards for each crushed ore discharged from the high-pressure roller mill and the wet sieve, and setting a matrix Q (di, M1i, M2i and M3i) of the iron contents and the single ore quality, wherein di represents the iron content of the corresponding lean ore, M1i represents the single quality standard of the first crushed ore corresponding to certain lean ore iron content, M2i represents the single quality standard of the second crushed ore corresponding to certain lean ore iron content, and M3i represents the single quality standard of the third crushed ore corresponding to certain lean ore iron content.
Specifically, the total mass of the first crushed ores is A, the total mass of the second crushed ores is B, the total mass of the third crushed ores is C, the number of the first crushed ores is N1, the number of the second crushed ores is N2, the number of the third crushed ores is N3, of the N1 first crushed ores, m of the first crushed ores meeting the single quality standard of the first crushed ores, N of the second crushed ores meeting the single quality standard of a plurality of second crushed ores are provided, l of the third crushed ores meeting the single quality standard of the third crushed ores are provided, m is smaller than or equal to N1, N is smaller than or equal to N2, and l is smaller than or equal to N3; the processing efficiency E was set using the formula E = k1 × (sum of mass of m first crushed ores/a) + k2 × (sum of mass of n second crushed ores/B) + k3 × (sum of mass of l third crushed ores/C), where k1+ k2+ k3= 1. For example, in practice, the total mass of 100 first crushed ores is calculated to be 1000kg for 100 first crushed ores, 1000kg of the first crushed ores are conveyed to the feeding port of the wet sieve, 400kg of second crushed ores remained on the wet sieve are conveyed to the feeding port of the high-pressure roller mill after the wet sieve is vibrated at high frequency, the number of the second crushed ores is 30, 30 of the first crushed ores can be 100 with larger particle size, 70, 600kg of third crushed ores passing through the wet sieve, the third crushed ores passing through the wet sieve are fed into the medium-field strong magnetic separator, magnetic minerals and non-magnetic minerals can be separated after passing through the medium-field strong magnetic separator, lean ores with different iron contents are set, different single ore quality standards are adopted for the first crushed ores, the second crushed ores and the third crushed ores, an iron content and single ore quality matrix Q (di, M1i, M2i, M3i) is set, wherein di represents the corresponding iron content of the lean ores, m1i represents a single quality standard of a first crushed ore corresponding to a certain lean ore iron content, M2i represents a single quality standard of a second crushed ore corresponding to a certain lean ore iron content, and M3i represents a single quality standard of a third crushed ore corresponding to a certain lean ore iron content; among 100 first crushed ores, 65 of the first crushed ores which meet the single quality standard of the first crushed ores; among the 30 second crushed ores, 18 of the second crushed ores which meet the single quality standard of the second crushed ores, and among the 20 third crushed ores, 16 of the third crushed ores which meet the single quality standard of the third crushed ores, and the processing efficiency E are calculated by the following formula:
e = k1 × (total mass of 65 first crushed ores/100) + k2 × (total mass of 18 second crushed ores/400) + k3 × (total mass of 16 third crushed ores/600), where k1+ k2+ k3=1, if the processing efficiency is lower than a set standard, the workload of the lean ore processing equipment is reduced, and the total mass of the lean ore conveyed to the feed port of the high pressure roll mill is reduced by 100 kg.
Specifically, in the processing process, if the lean ore processing efficiency of the equipment is lower than a preset standard, the lean ore processing efficiency can be decreased by 5kg and 95kg according to levels, and if the lean ore processing efficiency of the equipment does not reach the preset standard, the lean ore processing efficiency is decreased by 9.75kg and is decreased to 0.95 × 0.95 × 100= 90.25.
Specifically, in the embodiment of the present invention, by setting the processing efficiency, and the processing efficiency E is determined by the mass ratio satisfying the first crushed ore quality standard, the second crushed ore mass ratio satisfying the second crushed ore quality standard, and the third crushed ore mass ratio satisfying the third crushed ore quality standard, and in the processing process, the processing of each device is performed, and in different cases, the efficiencies of the first crushed ore, the second crushed ore, and the third crushed ore obtained by the high pressure roller mill and the wet screen are different, specifically, the smaller the mass of the third crushed ore is, the greater the mass of the first wet screen is represented, and at this time, the higher the lean ore processing efficiency is, therefore, the larger the coefficient k3 of the third crushed ore is, the higher the lean ore processing efficiency is represented, the higher the lean ore processing efficiency is, the higher the crushing efficiency is in unit time is, and the workload of the device can be increased according to actual needs, when the processing efficiency of the lean ore is lower, the coefficient k3 of the third crushed ore is smaller, so that the processing efficiency of the lean ore is less influenced by the quality of the third crushed ore in the processing process of the lean ore, if the processing efficiency of the lean ore is lower than the preset standard E0 in the processing process of the lean ore, the workload of the processing equipment of the lean ore is reduced, the processing amount is conveniently adjusted and distributed according to the processing efficiency, the equipment with high processing efficiency processes more lean ores, the equipment with lower processing efficiency bears less processing share, and the overall processing efficiency of a processing site is improved.
Specifically, k1 is equal to 0.2, k2 is equal to 0.2, k3 is equal to 0.6, the distribution probability of the occupied area of the third crushed ore is large, and the influence on the working efficiency is large, and the same is true in the practical application process.
Specifically, according to the lean ore processing method based on the high-pressure roller mill provided by the embodiment of the invention, the processing efficiency is set, so that the efficiency of each set of processing equipment is evaluated in the actual working process, and the overall efficiency of the lean ore processing equipment is conveniently and comprehensively considered.
Specifically, in practical application, the number of first crushed ores N1, the number of second crushed ores N2 and the number of third crushed ores N3 are measured by arranging corresponding infrared sensors to measure the number of crushed ores in a region of a unit weight part, and then the number of crushed ores in the unit weight part is obtained and converted into the number of crushed ores in the corresponding weight part.
Specifically, by arranging the infrared induction sensor, the quantity of crushed ores in a unit weight part area is measured, the quantity of crushed ores in the unit weight part area is obtained, and then the quantity of crushed ores in the unit weight part area is converted into the quantity of crushed ores in the corresponding weight part area, so that the quantity N1 of first crushed ores, the quantity N2 of second crushed ores and the quantity N3 of third crushed ores are obtained, the quantity of crushed ores in the unit weight part area is obtained through the infrared induction sensor, then through a conversion mode, required equipment is simple and easy to obtain, and finally, the quantity of first crushed ores, the quantity of second crushed ores and the quantity of third crushed ores obtained through accurate conversion are obtained, so that the method is convenient and rapid and is not prone to error.
Specifically, the lean ore mentioned in step S110 is a mineral whose grade does not meet a certain standard in the related art, for example, in the field of iron ore, it may generally refer to iron ore having an iron content of less than 70%. The granularity of the iron ore can be divided into a plurality of layers, such as coarse powder, fine powder, lump ore, raw ore and the like. Obtaining lean ore to be processed, wherein the particle size of the lean ore is less than or equal to 30mm, the lean ore to be processed can be obtained after crushing raw ore, and the raw ore can be lean ore or rich ore, which is not limited herein. The rich ore can obtain lean ore to be processed after passing through a crushing plant, and the lean ore can also obtain rich ore to be processed after being crushed. In step S120, the lean ore is conveyed to a feed inlet of the high-pressure roller mill to obtain a first crushed ore, the high-pressure roller mill adopts advanced technological principles of "material layer lamination crushing" and "static pressure crushing", so that the particle size of the lean ore to be processed can be reduced to be less than or equal to 30mm, the crushing ratio of the high-pressure roller mill is large, and the crushing efficiency is high. In step S130, the first crushed ore is screened by the wet sieve, the second crushed ore with a larger particle size is conveyed to the inlet of the high-pressure roller mill again, the second crushed ore with a smaller particle size passes through the wet sieve as a third crushed ore, and then passes through the medium-field strong magnetic separator to separate whether the third crushed ore contains a magnetic substance, so that the medium-field strong magnetic separator can effectively separate a non-magnetic mineral. It will be understood by those skilled in the art that in the embodiment of the present invention, different individual mineral quality criteria are used for setting the lean ores of different iron contents, the first crushed ore discharged from the high-pressure roll mill and the third crushed ore discharged from the wet screen, and the second crushed ore re-conveyed to the high-pressure roll mill by the wet screen, and a matrix Q (di, M1i, M2i, M3i) of iron contents and individual mineral quality is set, wherein di represents the corresponding iron content of the lean ore, M1i represents the individual quality criteria of the first crushed ore of the corresponding iron content of a certain lean ore, M2i represents the individual quality criteria of the second crushed ore of the corresponding iron content of a certain lean ore, and M3i represents the individual quality criteria of the third crushed ore of the corresponding iron content of a certain lean ore.
More specifically, d1 represents that the iron content of the lean ore is 70-60%, d2 represents that the iron content of the lean ore is 60-50%, d3 represents that the iron content of the lean ore is 50-40%, d4 represents that the iron content of the lean ore is 40-30%, d5 represents that the iron content of the lean ore is 30-20%, d6 represents that the iron content of the lean ore is 20-10%, and d7 represents that the iron content of the lean ore is 10-0; the M11, M12, M13, M14, M15, M16 and M17 are reduced in sequence; the M21, M22, M23, M24, M25, M26 and M27 are reduced in sequence; the M31, M32, M33, M34, M35, M36 and M37 are reduced in sequence.
In the embodiment of the invention, the iron content of the lean ore is graded and divided into 7 grade levels, and the quality standard of the crushed ore with high iron content is set to be larger in the specific application process, so that the actual crushing frequency can be reduced in the actual operation process, the extraction efficiency of the magnetic substance is improved, and the subsequent other operations are facilitated.
According to the lean ore processing method based on the high-pressure roller mill, the corresponding single quality standard is established for the iron content of the first crushed ore, the second crushed ore and the third crushed ore, the magnetic minerals in the lean ore are separated as much as possible, the content of the magnetic substances in tailings is reduced, and in addition, a closed-loop ore crushing flow for sending the second minerals with the granularity not meeting the requirement back to the inlet of the high-pressure roller mill is arranged between the wet sieve and the high-pressure roller mill, so that the processing is facilitated.
On the basis of the above example, the magnetic minerals obtained were conveyed to a coarse magnetic separator, which separates them into coarse-grained matter and fine-grained matter. The coarse-grained matter can be processed again, the fine-grained matter can be subjected to subsequent processing procedures, the coarse-grained matter is conveyed to the linear vibrating screen, iron ore concentrate passes through the linear vibrating screen, the iron ore concentrate is conveyed to a specified position by using a slurry pump and a ceramic pipe, coarse ore concentrate does not pass through the linear vibrating screen, and the coarse ore concentrate can be further processed. Specifically, the central idea in the embodiment of the invention is to perform multiple grinding and magnetic separation on the obtained magnetic minerals under the action of the high-pressure roller mill to form iron ore concentrate and tailings, wherein the extraction rate of the iron ore concentrate can be infinitely close to 100%, but in the actual application process, the extraction rate cannot reach 100% due to the action of dust or other impurities.
In the embodiment of the present invention, a practical application process will be described, as shown in fig. 2, fig. 2 is a practical processing process using a high-pressure roller mill, and the raw ore in the embodiment of the present invention passes through the high-pressure roller mill, a wet sieve, a medium-field strong magnetic separator, and a linear vibrating screen to obtain fine iron ore with a particle size of 0.75mm or less. In the practical application process, the model of the high-pressure roller mill is HFKG1600 × 1400 mm; the model of the medium-field strong magnetic separator is LCTY-1540; the model of the wet sieve is STM-S3661 GK. The diameter of the mesh of the wet sieve is 30 multiplied by 3.5mm, and the diameter of the mesh of the linear vibrating sieve GJZKK3061 is 0.75 mm.
Specifically, as shown in fig. 3, after passing through a coarse-grain magnetic separator, a coarse-grain substance and a fine-grain substance are obtained, and the coarse-grain substance passes through a linear vibrating screen to obtain iron ore concentrate, in the embodiment of the present invention, the fine-grain substance and the iron ore concentrate are further processed more finely, in the specific implementation process, because the particle size of the iron ore concentrate is very small, the iron ore concentrate may also be referred to as high-pressure roller coarse-grain concentrate, and the fine-grain substance may be referred to as high-pressure roller fine-grain concentrate slurry, specifically, the iron ore concentrate obtained by using rich ore may also be further processed, please refer to fig. 3, after the coarse ore concentrate is ground by adding a ball mill, a first spiral classifier is added, the separated third mineral which does not meet the separation standard is ground by adding the ball mill again, the separated third mineral which meets the separation standard is subjected to a first magnetic separator, a fourth mineral and a first tailing are obtained by performing the first magnetic, adding the fourth mineral into the first cyclone to obtain a fifth mineral and a sixth mineral; adding the fifth mineral into two magnetic separators connected in series, adding the sixth mineral into a first mill and a second mill respectively, and returning the sixth mineral passing through the second mill to the cyclone again; the first mill is connected with a second cyclone, the sixth minerals sequentially pass through the first mill and the second cyclone, the second cyclone is connected with a second magnetic separator, the first magnetic separator and the second magnetic separator obtain second tailings and seventh minerals, and the seventh minerals obtain iron ore concentrates after passing through a third cyclone, a third magnetic separator, a fourth magnetic separator and a fifth magnetic separator. The treatment of the high pressure roll coarse concentrate and the coarse concentrate may be exemplary of the treatment of the high pressure roll coarse concentrate.
Specifically, the first tailings and the second tailings pass through a tailings recovery magnetic separator, the tailings recovery magnetic separator is a sixth magnetic separator, final tailings and tailings residues are separated, and the tailings residues are added into the first spiral classifier. And (3) enabling the fine-grained substances, namely the fine-grained concentrated ore pulp of the high-pressure roller to pass through a cyclone classifier to obtain settled sand and overflow, adding the overflow into the third cyclone, and adding the settled sand into the second grinding machine.
Specifically, in the embodiment of the invention, the fourth magnetic separator passes through the elutriation machine and then enters the fifth magnetic separator, and after passing through the fifth magnetic separator, the fourth magnetic separator passes through the ore separation box and then passes through the ceramic filter to obtain iron ore concentrate and filtrate.
According to the lean ore processing method based on the high-pressure roller mill, provided by the embodiment of the invention, the processing of the magnetic substances is finer, so that the extraction purity of the iron ore in the lean ore is higher, more iron ore concentrates can be extracted from the iron ore in unit mass due to higher purity, and the utilization rate of the lean iron ore is greatly improved.
In the embodiment of the present invention, since the sedimentation and filtration of the ore slurry may cause clogging or other events affecting the purification progress, the lean ore processing method provided by the present invention needs to flush the extracted material with water, and in fig. 3, the amount of water needed for each step is identified and will not be described herein.
It can be understood by those skilled in the art that the selection of the first mill, the second mill, the first cyclone, the second cyclone, the third cyclone, the first magnetic separator, the second magnetic separator, the fourth magnetic separator, the fifth magnetic separator, etc. in the present application can be selected according to practical matters, and is not limited herein.
The method comprises the steps of screening raw ores through a coarse crusher and a middle crusher, feeding the raw ores to a feeding port of a high-pressure roller mill, treating the raw ores through the high-pressure roller mill, performing a dry type scattering process, then feeding the raw ores into a wet-screening high-frequency vibrating screen, performing wet-screening treatment through the vibrating screen, dividing the raw ores into two parts, keeping one part on the screen, conveying the part to the raw ores for reprocessing, and feeding the other part into a magnetic separation process. The raw ore in the embodiment of the invention can be rich ore or poor ore. The lean ore and the rich ore can be processed in different crushing workshops, the rich ore is stored in an ore storage yard with the granularity of less than 12mm after passing through a coarse crusher and a middle crusher, the rich ore with the granularity of more than 12mm is crushed by a fine crusher and then is sieved again, the lean ore is stored in the ore storage yard with the granularity of less than 30mm after passing through the coarse crusher and the middle crusher, and the lean ore with the granularity of more than 30mm is crushed by the fine crusher and then is sieved again. The granularity of the particles left on the sieve is more than 3mm, but less than 3mm, the particles firstly pass through a medium-field strong magnetic separator, the substances entering the medium-field strong magnetic separator comprise strong magnetic ores, weak magnetic ores and non-magnetic ores, the medium-field strong magnetic separator can separate the strong magnetic ores and the weak magnetic ores, and the non-magnetic ore fine sieve classifier obtains coarse-grain tailings, fine-grain tailings and circulating water.
Treating the strongly magnetic ore and the weakly magnetic ore obtained by a medium-field strong magnetic separator, performing sexual spiral classification, differentiating the granularity of the non-magnetic ore and the weakly magnetic ore again, differentiating the grains with large granularity and small granularity again by a spiral classifier, grinding the grains with large granularity and large density once, and then feeding the grains into the spiral classifier again until all the magnetic minerals become the minerals with small granularity and small density. And then, performing multiple low-intensity magnetic separation on all the minerals with fine granularity and small density to obtain iron ore concentrate and tailings after multiple magnetic separation.
In the embodiment of the invention, the iron ore concentrate is conveyed to a preset position by using a slurry pump, the ore concentrate is classified into the size fraction by using a GJZKK3061 high-efficiency energy-saving large-scale horizontal linear sieve, the iron ore concentrate slurry pump with the size of less than 0.75mm and a D203 composite ceramic pipe with the size of 1700 m are conveyed to a mineral separation workshop, the transportation cost is reduced by 40%, the coarse ore concentrate with the size of 0.75-3mm is conveyed to the mineral separation workshop by using an automobile, the production requirement of a grinding process in the mineral separation workshop is met, and the final tailings are pumped into a concentration tank by using a tailing pump.
The conveying tool is a conveying adhesive tape, the conveying adhesive tape is used for conveying closed processes of the process in the embodiment of the invention by using the transmission adhesive tape, the processing method in the embodiment of the invention is mechanized, excessive manual participation is not needed, and the processing efficiency is improved.
After the high-pressure roller milling technology is adopted, the granularity of raw ore products can be generally reduced to be below 3mm, the mFe grade of wet pre-selection tailings can be reduced to be about 1.31 percent, and the selection ratio is as follows: 1.48; and (3) coarse concentrate grade: TFe44.4%, mFe29.3%; yield of rough concentrate: 67.4 percent; and (3) recovery rate: 85.3 percent; the capacity of the mill is improved by about 30-50%, the electric energy is reduced by 20-50%, the number of workers is reduced, intelligent management is realized, the production cost is greatly saved, and the green development is met.
Adopting a new closed process of high-pressure roller grinding superfine grinding-wet pre-selection and wet screening; the high-pressure roller mill is developed by introducing German technology into the research institute of cement for fertilizer combination, and is matched with American GK sieve and Shenyang Longji wet magnetic separator, and the large-scale linear sieve is used for forming closed-circuit crushed ore.
The skilled person in the art can understand that, according to the lean ore processing method based on the high-pressure roller mill provided by the embodiment of the present invention, by introducing the processing efficiency, different processing efficiencies can be set at any equipment of the present invention, and when the equipment cannot meet the processing efficiency, the equipment can be selectively replaced, so as to improve the processing efficiency of the processing method of the present invention as a whole.
The processing method provided by the invention has the following characteristics: the crushing rate is high, the product granularity can be reduced to be below 3mm, and conditions are created for the application of a coarse crushing and pre-selecting tailing discarding process; the capacity of a downstream mill is improved by 40%, the energy consumption of the mill is reduced by 20-50%, more than 50% of tailings are thrown before milling is realized, and the service life of a tailings pond is effectively prolonged.
The high-pressure roller mill adopts advanced process principles of 'material layer lamination crushing' and 'static pressure crushing', so that the grade of ore entering a crushing system is reduced, and the utilization rate of ore resources is greatly improved; the connection and matching of the mining and dressing processes are more scientific and reasonable, and the yield of the iron concentrate powder reaches 100 ten thousand tons/year after the high-pressure roller mill workshop and the ore dressing workshop are matched.
The equipment adopts advanced static pressure crushing and material layer laminating crushing mechanisms of a movable and fixed roller hydraulic system, has large crushing ratio and high energy efficiency, can greatly reduce the processing cost through crushing preselection, and increases the resource reserves by reducing the mining and extracting grade, thereby improving the comprehensive development benefit of the whole ore deposit.
By applying the high-pressure roller mill and the crushing wet-type pre-selection operation process, the 'more crushing and less grinding, early throwing and early harvesting' can be realized, the grade of entering separation is improved, the treatment capacity of a mill in a separation workshop is increased, the consumption of steel balls and lining plates of the ball mill is reduced, the yield of iron concentrate powder is increased, and the service life of tailing tailings is prolonged.
The high-pressure roller mill is novel energy-saving equipment encouraged by the state, the milling and selecting products accord with the mineral separation principle of 'more crushing, less milling, early throwing and early harvesting', and mineral separation tests on the ore show that when the granularity of a crushed product is 3-0mm, the mFe grade of the pre-selected tailings is reduced to about 1.31% through a wet pre-selection tailing discarding process, and the recovery rate of magnetic iron reaches over 95%. Thereby greatly reducing the ore grinding amount and saving the grinding and selecting cost. The technology of introducing the high-pressure roller mill equipment is applied to the engineering of improving the ore dressing plant to save energy and reduce emission, and the following aims are achieved:
1. the ore grade mFe of the ore entering the crushing system is reduced from 20.19 percent to 11.49 percent, and the utilization efficiency of ore resources is improved.
2. The crushing process is optimized, effective waste disposal is realized, the production shows that the mFe grade of the pre-selected tailings is reduced to below 1.31 percent, and the recovery rate of the magnetic iron reaches above 95 percent; the productivity is improved by nearly 40 percent.
3. The grade of the ore to be ground is improved, the granularity of the ore to be ground is reduced, and the capacity of a grinding and selecting system is increased; the grinding and sorting products meet the mineral separation principle of 'more crushing and less grinding, early throwing and early harvesting'; mineral separation tests on the ore show that when the particle size of a crushed product is 3-0mm, the ore grinding time is greatly reduced, and the ore grinding cost is saved.
4. The labor cost is saved, the intelligent and numerical control centralized master control management is realized, the comprehensive management operation capacity is improved, and the effects of energy conservation and consumption reduction are achieved.
5. The high-pressure roller mill roller nail is a main vulnerable part, and long-term experiment processes show that the roller nail in the high-pressure roller mill in the embodiment of the invention has long service life, the factory design service life is 8000-10000 hours, the service life of the same industry is about 9000 hours, the high-pressure roller mill roller nail is 23500 hours, and the utilization efficiency is greatly improved.
6. The uniqueness of the conveying mode of the pre-selected concentrate is that the concentrate is subjected to size grading by a GJZKK3061 high-efficiency energy-saving large-scale horizontal linear sieve, the concentrate below 0.75mm is conveyed to a mineral separation workshop by a slurry pump and a D203 composite ceramic pipe of 1700 meters, the conveying cost is reduced by 40%, the rough concentrate of 0.75-3mm is conveyed to the mineral separation workshop by an automobile, and the production requirement of a grinding process of the mineral separation workshop is met.
For the crushing of low-grade iron ore, the Purchase coefficient is 8-16, so that the high-pressure roller grinding technology selected in the same industry at home is the most advanced crushing technology at present, and the existing production effect cannot be achieved by selecting other crushing technologies.
The equipment adopts the advanced mechanisms of static pressure crushing and material layer laminating crushing of a movable and fixed roller hydraulic system, has large crushing ratio and high energy efficiency, can greatly reduce the processing cost through crushing preselection, and increases the resource reserves by reducing the mining and mining grade, thereby improving the comprehensive development benefit of the whole ore deposit. By applying the high-pressure roller mill and the crushing wet-type pre-selection operation process, the 'more crushing and less grinding, early throwing and early harvesting' can be realized, the grade of entering selection is improved, the treatment capacity of a mill in a dressing workshop is increased, the consumption of steel balls and lining plates of the ball mill is reduced, the yield of iron concentrate powder is increased, and the service life of tailing tailings is prolonged.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A lean ore processing method based on a high-pressure roller mill is characterized by comprising the following steps:
obtaining lean ore to be processed, wherein the granularity of the lean ore is 30mm;
conveying the lean ores with the total mass of A to a feeding port of a high-pressure roller mill to obtain first crushed ores, wherein the granularity of the first crushed ores is less than or equal to 30mm, and the number of the first crushed ores is N1;
conveying the first crushed ore to a feeding port of a wet sieve, conveying second crushed ore with the total mass of B remained on the wet sieve to the feeding port of the high-pressure roller mill after the wet sieve vibrates at high frequency, wherein the quantity of the second crushed ore is N2, third crushed ore with the total mass of C passes through the wet sieve, and the quantity of the third crushed ore is N3;
adding the third crushed ore into a high-intensity magnetic separator to separate magnetic minerals and non-magnetic minerals;
setting lean ores with different iron contents, adopting different single ore quality standards for each crushed ore discharged by the high-pressure roller mill and the wet sieve, and setting a matrix Q (di, M1i, M2i and M3i) of the iron contents and the single ore quality, wherein i is any single ore, di represents the iron content of the corresponding lean ore, M1i represents the single quality standard of the first crushed ore corresponding to certain lean ore iron content, M2i represents the single quality standard of the second crushed ore corresponding to certain lean ore iron content, and M3i represents the single quality standard of the third crushed ore corresponding to certain lean ore iron content;
among the N1 first crushed ores, m of the N1 first crushed ores meet the single quality standard of the first crushed ores, N of the N first crushed ores meet the single quality standard of the second crushed ores, l of the N first crushed ores meet the single quality standard of the third crushed ores, m is less than or equal to N1, N is less than or equal to N2, and l is less than or equal to N3;
setting the processing efficiency E, wherein the adopted calculation formula is as follows:
e ═ k1 × (mass sum of m first crushed ores/a) + k2 × (mass sum of n second crushed ores/B) + k3 × (mass sum of l third crushed ores/C), where k1+ k2+ k3 ═ 1, k1 denotes the weight coefficient of the first crushed ore, k2 denotes the weight coefficient of the second crushed ore, and k3 denotes the weight coefficient of the third crushed ore;
if the lean ore processing efficiency is lower than the preset standard E0 in the lean ore processing process, the workload of the lean ore processing equipment is reduced, and the total mass A of the lean ore conveyed to the feeding port of the high-pressure roller mill is reduced.
2. The high pressure roller mill-based lean ore processing method according to claim 1, wherein if the lean ore processing efficiency during the lean ore processing is lower than a preset standard E0, the total mass of the lean ore conveyed to the feed port of the high pressure roller mill is reduced to 0.95A for the first time, the processing efficiency E is recalculated, and if the lean ore processing efficiency is lower than a preset standard E0, the total mass of the lean ore conveyed to the feed port of the high pressure roller mill is reduced to 0.95x0.95A for the second time, and so on.
3. The high pressure roller mill based lean ore processing method according to claim 1, characterized in that k1 is set equal to 0.2, k2 is set equal to 0.2, k3 is set equal to 0.6; when the number of the first crushed ores N1, the number of the second crushed ores N2 and the number of the third crushed ores N3 are measured, the number of the crushed ores in a unit mass part area is measured by arranging corresponding infrared sensors, the number of the crushed ores in the unit mass part area is obtained, and the obtained number is converted into the number of the crushed ores in the corresponding mass part area.
4. The high-pressure roller mill-based lean ore processing method according to claim 1, characterized in that d1 represents that the lean ore has an iron content of 70% to 60%, d2 represents that the lean ore has an iron content of 60% to 50%, d3 represents that the lean ore has an iron content of 50% to 40%, d4 represents that the lean ore has an iron content of 40% to 30%, d5 represents that the lean ore has an iron content of 30% to 20%, d6 represents that the lean ore has an iron content of 20% to 10%, and d7 represents that the lean ore has an iron content of 10% to 0;
the M11, M12, M13, M14, M15, M16 and M17 are reduced in sequence;
the M21, M22, M23, M24, M25, M26 and M27 are reduced in sequence;
the M31, M32, M33, M34, M35, M36 and M37 are reduced in sequence.
5. The high pressure roller mill-based lean ore processing method according to claim 1, characterized by further comprising, before obtaining the lean ore to be processed:
and adding the rich ore or the lean ore into the coarse crusher and the medium crusher in sequence.
6. The high pressure roller mill based lean ore processing method according to claim 1, characterized in that the magnetic minerals are conveyed to a coarse magnetic separator that separates the magnetic minerals into coarse-sized substances and fine-sized substances;
conveying the coarse-grained substances to a linear vibrating screen, conveying iron ore concentrate which passes through the linear vibrating screen to a specified position by using a slurry pump and a ceramic pipe, and conveying coarse ore concentrate which does not pass through the linear vibrating screen;
adding the rough concentrate into a ball mill for polishing, adding the rough concentrate into a first spiral classifier, adding the separated third mineral which does not meet the separation standard into the ball mill again for polishing, carrying out first magnetic separation on the separated third mineral which meets the separation standard through a first magnetic separator, obtaining a fourth mineral and first tailings through the first magnetic separation, and adding the fourth mineral into a first cyclone to obtain a fifth mineral and a sixth mineral; adding the fifth mineral into two magnetic separators connected in series, adding the sixth mineral into a first mill and a second mill respectively, and returning the sixth mineral passing through the second mill to the cyclone again; the first mill is connected with a second cyclone, the sixth minerals sequentially pass through the first mill and the second cyclone, the second cyclone is connected with a second magnetic separator, the first magnetic separator and the second magnetic separator obtain second tailings and seventh minerals, and the seventh minerals obtain iron ore concentrates after passing through a third cyclone, a third magnetic separator, a fourth magnetic separator and a fifth magnetic separator.
7. The high pressure roller mill based lean ore processing method according to claim 6, wherein the first tailings and the second tailings are separated into final tailings and tailings residues through a tailings recovery magnetic separator, the tailings residues are added to the first spiral classifier, and the final tailings are pumped into a concentration tank through a tailings pump.
8. The high pressure roller mill based lean ore processing method according to claim 6, wherein the fine grained matter is passed through a cyclone classifier to obtain sediment and overflow, the overflow is fed to the third cyclone, and the sediment is fed to the second mill.
9. The high pressure roller mill based lean ore processing method according to claim 6, characterized in that the iron concentrate is transported to a predetermined position using a slurry pump.
10. The high pressure roller mill based lean ore processing method according to any one of claims 1 to 9, wherein the means for conveying is a conveyor belt.
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