CN113145294A - Chromite beneficiation system and beneficiation process - Google Patents
Chromite beneficiation system and beneficiation process Download PDFInfo
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- CN113145294A CN113145294A CN202110360142.9A CN202110360142A CN113145294A CN 113145294 A CN113145294 A CN 113145294A CN 202110360142 A CN202110360142 A CN 202110360142A CN 113145294 A CN113145294 A CN 113145294A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012216 screening Methods 0.000 claims abstract description 43
- 239000012141 concentrate Substances 0.000 claims abstract description 39
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000000498 ball milling Methods 0.000 claims abstract description 19
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims description 24
- 230000005484 gravity Effects 0.000 claims description 23
- 239000011651 chromium Substances 0.000 claims description 21
- 229910052804 chromium Inorganic materials 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 5
- 241001584775 Tunga penetrans Species 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 2
- 239000002390 adhesive tape Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000010494 dissociation reaction Methods 0.000 description 3
- 230000005593 dissociations Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention discloses a chromite beneficiation system and a chromite beneficiation process, and belongs to the field of mining production. The operation mechanism comprises a first reselection device, a grading device, a ball milling device and a second reselection device, the first reselection device, the grading device, the ball milling device and the second reselection device are sequentially arranged, the crushing device rolls and crushes raw ore and conveys the raw ore to the screening device, unqualified ore powder sieved by the screening device is rolled and crushed again by the crushing device, qualified ore powder sieved by the screening device is sorted into high-quality chrome concentrate A1 and tailings B by the reselection device, the tailings B are separated into corresponding product C and product D by the grading device, the product D is further ground by the ball milling device and returns to the grading device, and the product C is further sorted into concentrate A2 and tailings residue by the reselection device. The high-pressure roller mill is used for replacing rough grinding operation, so that on one hand, the energy consumption of a system is reduced, the production cost is saved, the over-grinding probability of chromite is greatly reduced, the reselection operation is improved, and the sorting index is improved.
Description
Technical Field
The invention relates to the technical field of mining production, in particular to a chromite beneficiation system and a chromite beneficiation process.
Background
Chromium is a strategic resource where the processing of stainless steel requires large quantities of this metal. China is a country with large stainless steel consumption, but our raw materials (chromite, a mineral and main raw materials for refining chromium metal) are very deficient and have poor quality, so the dependence on import on the chromite raw materials is particularly high. Aiming at the characteristics of more and less chromium resources and poor ores in China, how to efficiently utilize the resources is particularly important.
At present, most of chromite beneficiation processes are also traditional crushing-grinding and gravity separation operations, the ores are directly ground to a certain fineness at one time, and then separation is carried out by utilizing the gravity separation operation. However, the conventional crushing is difficult to crush to reach the granularity required by gravity separation, and the grinding is easy to cause over-grinding of ores, so that the ore dressing cost is increased, the gravity separation environment is also worsened, and the waste of chromium resources is caused.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a chromite beneficiation system and a chromite beneficiation process, which solve the problems that conventional crushing cannot meet the requirement of gravity separation and separation granularity, and the increase of milling cost and the over-milling of chromite are caused by the increase of ball milling operation. The high-pressure roller grinding is used for replacing coarse grinding operation, so that on one hand, the energy consumption of the system is reduced, and the production cost is saved. On the other hand, the over-grinding probability of chromite is greatly reduced, the reselection operation is improved, and the selection index is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a dressing system of chromite, includes the crushing mechanism, screening mechanism and the sorting mechanism that arrange in proper order according to production technology order, the sorting mechanism is including reselecting equipment one, grading plant, ball-milling equipment and reselecting equipment two, crushing mechanism rolls in the roll-in breakage and carries to screening mechanism to raw ore, warp unqualified powdered ore that screening mechanism sieved is again through crushing mechanism roll-in breakage, warp qualified powdered ore after screening mechanism sieves selects high-quality chrome concentrate A1 and tailing B through reselecting equipment one minute, tailing B warp corresponding product C and product D are gone out in grading plant classification operation, product D returns grading plant after the grinding of ball-milling equipment again, and product C selects out chrome concentrate A2 and tailings sediment through reselecting equipment two minutes.
Further preferably, the crushing mechanism comprises a high-pressure roller mill, the initial pressure of the high-pressure roller mill is 5.0-6.0 MPa, and the initial roller gap is 16-20 mm.
Further preferably, the screening mechanism comprises a linear vibrating screen for screening by a wet process.
Further preferably, the size of the screen hole of the linear vibrating screen is any of 2mm, 3mm, 4mm and 5 mm.
Further preferably, the first reselection equipment and the second reselection equipment both comprise one or more of a jigger, a spiral concentrator or a shaker, and are continuously operated in one section or multiple sections.
Further preferably, the classification equipment comprises a hydrocyclone, and the product fineness of the product C obtained by classification of the hydrocyclone is-0.074 mm and accounts for 70-80%.
A beneficiation process of a chromite beneficiation system comprises the following steps:
s1) crushing the raw ore to 30-0mm by adopting a conventional crushing process;
s2) crushing the 30-0mm material in the S1) to a proper operation granularity of gravity separation equipment I (31) by using a closed-circuit crushing process of the crushing mechanism (1);
s3) sorting the crushed products screened by the screening mechanism (2) in S2) by a first gravity separation device (31) to pre-sort high-quality qualified chrome concentrate A1 and tailings B;
s4) closed circuit grinding operation is formed by utilizing grading equipment and ball milling equipment, firstly, the tailings B in the step S3) are ground through the grading equipment, and a product C with the fineness of-0.074 mm and the proportion of 70% -80% and a product D needing to be ground through the ball milling equipment are obtained through grading;
s5) performing reselection by using the product C in the second reselection equipment (will be S4), and finally obtaining the chrome concentrate A2 and tailings.
Further preferably, the specific operation in the step S2) includes the following steps:
s2.1) the initial pressure of the crushing mechanism is 5.0-6.0 MPa, and the initial roller gap is 16-20 mm;
s2.2) combining the crushing mechanism with the screening mechanism to form a closed-circuit crushing process, wherein the screening mechanism adopts a linear vibrating screen and screens by a wet process, and the size of a screen hole is any one of the specifications of 2mm, 3mm, 4mm and 5 mm;
s2.3) returning the oversize products of the screening mechanism to the crushing mechanism for re-crushing, and feeding the undersize products to the rear-stage gravity separation equipment for operation.
Compared with the prior art, the invention has the following beneficial effects:
obtaining 30-0mm ore through conventional crushing, feeding the ore into a high-pressure roller mill for rolling crushing, screening a rolled product through a wet screen, returning the product on the screen to the high-pressure roller mill, and feeding the product under the screen into gravity separation operation. The process utilizes the closed crushing operation of the high-pressure roller mill to replace the traditional one-section ore grinding operation, and is energy-saving and capable of effectively reducing the operation cost in the material preparation stage from the ore dressing concept of more crushing and less grinding. Meanwhile, because chromite is mostly in the characteristics of aggregate embedding and brittleness, the material layer is subjected to ultrahigh static pressure in the crushing process of the high-pressure roller mill, chromite particles are easily dissociated from gangue, and the dissociation degree of the material is obviously improved. Therefore, the method can effectively avoid the over-grinding phenomenon of the chromite, is beneficial to the subsequent reselection operation, and improves the high-quality graded utilization and the comprehensive utilization rate of the chromite.
Drawings
FIG. 1 is a schematic diagram of the configuration of a beneficiation system of the present invention;
fig. 2 is a beneficiation process flow diagram of the beneficiation system of the present invention.
In the figure: 1. a crushing mechanism; 2. a screening mechanism; 3. a sorting mechanism; 31. reselecting the first equipment; 32. a classification device; 33. ball milling equipment; 34. and reselecting the second equipment.
Detailed Description
As shown in fig. 1 to 2, the chromite beneficiation system comprises a crushing mechanism 1, a screening mechanism 2 and a sorting mechanism 3 which are arranged in sequence according to a production process sequence, the screening mechanism 3 comprises a first reselection device 31, a classification device 32, a ball milling device 33 and a second reselection device 34, the crushing mechanism 1 rolls and crushes the raw ore and conveys the raw ore to the screening mechanism 2, the unqualified ore powder screened by the screening mechanism 2 is rolled and crushed by the crushing mechanism 1 again, the qualified ore powder screened by the screening mechanism 2 is separated into high-quality chromium concentrate A1 and tailings B by gravity separation equipment I31, and classifying the tailings B by the classifying equipment 32 to obtain a corresponding product C and a corresponding product D, grinding the product D by the ball milling equipment 33, returning the product D to the classifying equipment 32, and separating the product C from the chromium concentrate A2 and the tailings by the second gravity separation equipment 34.
Further preferably, the crushing mechanism 1 comprises a high-pressure roller mill, the initial pressure of the high-pressure roller mill is 5.0-6.0 MPa, and the initial roller gap is 16-20 mm.
Further preferably, the screening mechanism 2 comprises a linear vibrating screen for screening by a wet process.
Further preferably, the size of the screen hole of the linear vibrating screen is any of 2mm, 3mm, 4mm and 5 mm.
Further preferably, the first reselection equipment 31 and the second reselection equipment 34 both comprise one or more of a jigger, a spiral concentrator or a shaker, and adopt one-stage or multi-stage continuous operation.
Further preferably, the classification equipment 32 comprises a hydrocyclone, and the product fineness of the product C obtained by the hydrocyclone classification operation is-0.074 mm and accounts for 70-80%.
A beneficiation process of a chromite beneficiation system comprises the following steps:
s1) crushing the raw ore to 30-0mm by adopting a conventional crushing process;
s2) crushing the material of 30-0mm in the S1) to the granularity suitable for the first 31 operation of gravity separation equipment by using a closed-circuit crushing process of the crushing mechanism 1;
s3) sorting the crushed products obtained in the S2) through the screening mechanism (2) by utilizing a first gravity separation device 31, and pre-selecting high-quality qualified chrome concentrate A1 and tailings B;
s4) closed circuit grinding operation is formed by the grading equipment 32 and the ball milling equipment 33, firstly, the tailings B in the step S3) are graded by the grading equipment 32, and a product C with the fineness of-0.074 mm and the proportion of 70% -80% and a product D needing to be ground by the ball milling equipment 33 are obtained through grading;
s5) reselecting the product C in the S4) by a second reselecting device 34 to finally obtain chromium concentrate A2 and tailings.
Further preferably, the specific operation in the step S2) includes the following steps:
s2.1) the initial pressure of the crushing mechanism 1 is 5.0-6.0 MPa, and the initial roller gap is 16-20 mm;
s2.2) the crushing mechanism 1 is combined with the screening mechanism 2 to form a closed-circuit crushing process, the screening mechanism 2 adopts a linear vibrating screen and screens by a wet process, and the size of a screen hole is any one of the specifications of 2mm, 3mm, 4mm and 5 mm;
s2.3) returning the oversize products of the screening mechanism 2 to the crushing mechanism 1 for re-crushing, and feeding the undersize products to the first 31 rear-stage gravity separation equipment for operation.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
as shown in figures 1 to 2, in a chromite selection plant, the raw ore granularity is 250-0 mm, the ore moisture content is 5%, and Cr is2O3The content is 40.37%.
S1) forming two sections of closed-circuit crushing processes by using a jaw crusher, a cone crusher and a 30mm sieve mesh vibrating screen to obtain a 30-0mm product;
s2) feeding the product of 30-0mm in the step S1) into a bin of a high-pressure roller mill by using an adhesive tape machine, wherein the initial pressure of the high-pressure roller mill is 5.5MPa, the gap between initial rollers is 16mm, the ore is crushed by the high-pressure roller mill and then fed into a linear vibrating screen, the content of-0.074 mm in the product after the rollers is 12.23 percent, the content of-1 mm and-2 mm in particle size is 76.34 percent and 80.33 percent respectively, wet screening is adopted in screening, the size of a screen hole is 2mm, the product on the screen is returned to the high-pressure roller mill by the adhesive tape machine to be continuously crushed, and the product under the screen falls into a pump pool;
s3) feeding a product of 2-0 mm wet sieve in the S2) into a roughing spiral chute (namely a spiral concentrator) by using a slurry pump, controlling the feeding concentration to be 30% to obtain roughing concentrate and tailings B1, then feeding the roughing concentrate into a concentration spiral chute, controlling the feeding concentration to be 26% to obtain chromium concentrate A1 and tailings B2, taking tailings B1 and tailings B2 as tailings B, and taking Cr and Cr as tailings B2O350.64 percent and 50.69 percent of recovery rate;
s4) feeding the tailings B obtained in the step S3) into a hydrocyclone, controlling the overflow fineness to be-0.074 mm 75%, feeding an overflow product (product C) into a subsequent gravity separation operation, feeding settled sand (product D) of the hydrocyclone into a ball mill, and feeding an ore discharge product of the ball mill into the hydrocyclone;
s5) feeding the-0.074 mm 75% ground ore obtained in S4) into a first-stage shaking table operation to respectively obtain first-stage shaking table concentrate, middlings and tailings, feeding the first-stage middlings into a second-stage shaking table operation to obtain second-stage concentrate and tailings, wherein the first-stage shaking table concentrate and the second-stage shaking table concentrate are used as chromium concentrate A2, the grade is 46.43%, the recovery rate is 27.76%, and the first-stage tailings and the second-stage tailings are combined into final tailing slag.
Example 2:
as shown in figures 1 to 2, in a chromite selection plant, the raw ore granularity is 250-0 mm, the ore moisture content is 5%, and Cr is2O3The content is 40.37%.
S1) forming two sections of closed-circuit crushing processes by using a jaw crusher, a cone crusher and a 30mm sieve mesh vibrating screen to obtain a 30-0mm product;
s2) feeding the product of 30-0mm in the step S1) into a bin of a high-pressure roller mill by using an adhesive tape machine, wherein the initial pressure of the high-pressure roller mill is 5.5MPa, the gap between initial rollers is 16mm, the ore is crushed by the high-pressure roller mill and then fed into a linear vibrating screen, the content of-0.074 mm in the product after rolling is 12.53%, the content of-1 mm and-3 mm in particle size is 75.74% and 82.94% respectively, wet screening is adopted in screening, the size of a screen hole is 3mm, the product on the screen is returned to the high-pressure roller mill by the adhesive tape machine to be continuously crushed, and the product under the screen falls into a pump pool;
s3) feeding a product with the thickness of 3-0 mm obtained by wet screening in the S2) into a roughing spiral chute (spiral concentrator) by using a slurry pump, controlling the feeding concentration to be 30% to obtain roughing concentrate and tailings B1, then feeding the roughing concentrate into a concentration spiral chute, controlling the feeding concentration to be 26% to obtain chromium concentrate A1 and tailings B2, taking tailings B1 and tailings B2 as tailings B, and taking Cr and tailings B2 as tailings B2O3The content is 50.21 percent, and the recovery rate is 49.45 percent.
S4) feeding the chromite roughing and concentrating tailings obtained in the step S3) into a hydrocyclone, controlling the overflow fineness to be-0.074 mm 78%, feeding an overflow product (product C) into a subsequent reselection operation, feeding settled sand (product D) of the hydrocyclone into a ball mill, and feeding ore discharge products of the ball mill into the hydrocyclone;
s5) feeding the-0.074 mm 78% ground ore obtained in S4) into a first-stage shaking table operation to respectively obtain first-stage shaking table concentrate, middlings and tailings, feeding the first-stage middlings into a second-stage shaking table operation to obtain second-stage concentrate and tailings, wherein the first-stage shaking table concentrate and the second-stage shaking table concentrate are used as chromium concentrate A2, the grade is 46.43%, the recovery rate is 27.76%, and the first-stage tailings and the second-stage tailings are combined into final tailing slag.
Example 3:
as shown in figures 1 to 2, in a chromite selection plant, the raw ore granularity is 250-0 mm, the ore water content is 3%, and Cr is2O3The content is 38.23%.
S1) forming two sections of closed-circuit crushing processes by using a jaw crusher, a cone crusher and a 30mm sieve mesh vibrating screen to obtain a 30-0mm product;
s2) feeding the product of 30-0mm in the step S1) into a bin of a high-pressure roller mill by using an adhesive tape machine, wherein the initial pressure of the high-pressure roller mill is 5.5MPa, the gap between initial rollers is 16mm, the ore is crushed by the high-pressure roller mill and then fed into a linear vibrating screen, the content of-0.074 mm in the product after rolling is 13.12 percent, the content of-1 mm and-2 mm in particle size is 75.34 percent and 81.33 percent respectively, wet screening is adopted for screening, the size of a screen hole is 2mm, the product on the screen is returned to the high-pressure roller mill by the adhesive tape machine to be continuously crushed, and the product under the screen falls into a pump pool;
s3) feeding a product with the size of 2-0 mm obtained by wet screening in the S2) into a roughing spiral chute (spiral concentrator) by using a slurry pump, controlling the feeding concentration to be 30% to obtain roughing concentrate and tailings B1, then feeding the roughing concentrate into a concentration spiral chute, controlling the feeding concentration to be 26% to obtain chromium concentrate A1 and tailings B2, taking tailings B1 and tailings B2 as tailings B, and taking Cr and tailings B2 as tailings B2O3Content 48.74% and recovery rate 46.78%.
S4) feeding the chromite roughing and concentrating tailings obtained in the step S3) into a hydrocyclone, controlling the overflow fineness to be-0.074 mm 80%, feeding an overflow product (product C) into a subsequent reselection operation, feeding settled sand (product D) of the hydrocyclone into a ball mill, and feeding ore discharge products of the ball mill into the hydrocyclone;
s5) feeding the-0.074 mm 80% ground ore obtained in S4) into a first-stage shaking table operation to respectively obtain first-stage shaking table concentrate, middlings and tailings, feeding the first-stage middlings into a second-stage shaking table operation to obtain second-stage concentrate and tailings, wherein the first-stage shaking table concentrate and the second-stage shaking table concentrate are used as chromium concentrate A2, the grade is 46.43%, the recovery rate is 27.76%, and the first-stage tailings and the second-stage tailings are combined into final tailing slag.
The closed crushing process of the high-pressure roller mill is used for replacing ball milling operation, the high-efficiency crushing effect of the lamination crushing mechanism of the high-pressure roller mill is fully exerted, and the chromite is brittle and fragile and is easy to crack along a mineral dissociation surface under ultrahigh static pressure, so that the improvement of the dissociation degree of a crushed product is facilitated. Greatly reduces the probability of over-grinding of minerals and is easy to select qualified high-quality chrome concentrate in advance by gravity separation. But also replaces a section of ball milling operation, obviously reduces the production energy consumption and saves the production cost.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. The technical solution and the inventive concept thereof according to the present invention should be equally replaced or changed within the protection scope of the present invention.
Claims (8)
1. The chromite beneficiation system comprises a crushing mechanism (1), a screening mechanism (2) and a sorting mechanism (3) which are sequentially arranged according to a production process sequence, and is characterized in that the sorting mechanism comprises a gravity separation device I (31), a grading device (32), a ball milling device (33) and a gravity separation device II (34), the crushing mechanism (1) rolls and crushes raw ores and conveys the crushed raw ores to the screening mechanism (2), unqualified ore powders sieved by the screening mechanism (2) are rolled and crushed by the crushing mechanism (1) again, qualified ore powders sieved by the screening mechanism (2) are separated into high-quality chromium concentrate A1 and tailings B by the gravity separation device I (31), the tailings B are graded by the grading device (32) to obtain corresponding product C and product D, the product D is fed into the ball milling device and returns to the grading device after further grinding, and separating the product C from the chromium concentrate A2 and the tailing slag by a second gravity separation device (34).
2. The chromite beneficiation system according to claim 1, wherein the crushing mechanism (1) comprises a high pressure roller mill, the high pressure roller mill has an initial pressure of 5.0-6.0 MPa and an initial roller gap of 16-20 mm.
3. A chromite beneficiation system according to claim 1, wherein the screening means (2) comprises a linear vibrating screen that screens by a wet process.
4. A chromite beneficiation system according to claim 3, wherein the linear vibrating screen has a mesh size of any of 2mm, 3mm, 4mm, 5 mm.
5. A chromite beneficiation system according to claim 1, wherein the first (31) and second (34) gravity concentration plants each comprise one or more of a jigger, a spiral concentrator or a shaker, operating in one or more stages.
6. The chromite beneficiation system according to claim 1, wherein the classification equipment (32) comprises a hydrocyclone, and the product fineness of the product C obtained through classification by the hydrocyclone is-0.074 mm and accounts for 70-80%.
7. A process for beneficiation of a chromite beneficiation system according to claim 1, characterized by comprising the steps of:
s1) crushing the raw ore to 30-0mm by adopting a conventional crushing process;
s2) crushing the 30-0mm material in the S1) to a proper operation granularity of gravity separation equipment I (31) by using a closed-circuit crushing process of the crushing mechanism (1);
s3) sorting the crushed products screened by the screening mechanism (2) in S2) by a first gravity separation device (31) to pre-sort high-quality qualified chrome concentrate A1 and tailings B;
s4), a closed circuit grinding operation is formed by utilizing a grading device (32) and a ball milling device (33), firstly, the tailings B in the step S3) are graded by the grading device (32), and a product C with the fineness of-0.074 mm and the proportion of 70% -80% and a product D needing to be ground by the ball milling device (33) are obtained through grading;
s5) reselecting the product C in the S4) by a second reselecting device (34), and finally obtaining the chrome concentrate A2 and tailing slag.
8. The beneficiation process of a chromite beneficiation system according to claim 7, wherein the specific operation in the step S2) comprises the following:
s2.1) the initial pressure of the crushing mechanism (1) is 5.0-6.0 MPa, and the initial roller gap is 16-20 mm;
s2.2) combining the crushing mechanism (1) with the screening mechanism (2) to form a closed-circuit crushing process, wherein the screening mechanism adopts a linear vibrating screen and screens by a wet process, and the size of a screen hole is any one of the specifications of 2mm, 3mm, 4mm and 5 mm;
s2.3) returning the oversize products of the screening mechanism (2) to the crushing mechanism (1) for re-crushing, and feeding the undersize products to the rear-section reselection equipment I (31) for operation.
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