CN109351447B - Lean magnetite's ore dressing production system - Google Patents
Lean magnetite's ore dressing production system Download PDFInfo
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- CN109351447B CN109351447B CN201811135696.3A CN201811135696A CN109351447B CN 109351447 B CN109351447 B CN 109351447B CN 201811135696 A CN201811135696 A CN 201811135696A CN 109351447 B CN109351447 B CN 109351447B
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000007885 magnetic separation Methods 0.000 claims abstract description 65
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 40
- 239000006148 magnetic separator Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000002699 waste material Substances 0.000 claims abstract description 22
- 239000012141 concentrate Substances 0.000 claims abstract description 21
- 238000012216 screening Methods 0.000 claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 235000019580 granularity Nutrition 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 206010024796 Logorrhoea Diseases 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- 238000005456 ore beneficiation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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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
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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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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Abstract
The invention discloses a lean magnetite beneficiation production system, and belongs to the technical field of beneficiation. The ore dressing process comprises the steps of coarse crushing → medium crushing → magnetic separation → transfer, wherein the medium crushing device is arranged in front of an ore stope, and coarse crushing, medium crushing and dry magnetic separation are directly carried out in the stope, so that the purpose of early throwing and early losing of tailing waste stones is realized, the grade of coarse concentrate is improved, the ore transportation amount is reduced, the ore transportation cost is reduced, the service lives of a belt and a magnetic separator funnel lining plate are prolonged, and the mine operation cost is effectively reduced. The production system comprises a coarse crusher, a screening machine, a middle crusher and a magnetic separator which are sequentially arranged in an ore stope according to a production line, a rubber belt conveyor I for conveying tailings and waste rocks after magnetic separation to a dumping site and a rubber belt conveyor II for conveying coarse concentrate after magnetic separation to subsequent processes, expands the mining area of iron ores, and is particularly worthy of popularization and application for the actual situation of national mineral products mainly based on lean iron ores.
Description
The invention is a divisional application, a parent application number: 2016106694123, respectively; name of mother case: a lean magnetite beneficiation process and a production system thereof; application date of the parent: 2016-8-15.
Technical Field
The invention belongs to the technical field of ore dressing, and particularly relates to an ore dressing production system for lean magnetite.
Background
At present, the energy-saving society is entered in China, the energy cost is higher and higher, the mining industry is the industry with higher energy consumption in China, the mining enterprises are required to start from the fine points according to different conditions and ore characteristics, key points of energy saving and consumption reduction are found, and on the premise of ensuring the technical indexes of mineral separation, the corresponding energy-saving technology, equipment and process are comprehensively researched and adopted, so that the cost is reduced and the efficiency is improved.
At present, the economy of China enters a new normal state of switching from high speed to medium-high speed, the steel industry is changed newly, and the development characteristics of low growth, low price, low benefit and high pressure of three-low-one-high are presented. The iron ore mining and selecting industry in China, which is a main raw material in the steel industry, has a new normal state of low selling price, low profit level and short fund. By 2015, the price of the iron ore is continuously lowered for three years, which is more than 50% lower than that of the iron ore at early 2014, and by 2016, 2, 24 days, the price of directly importing 62% grade dry base powder ore of the iron ore to the shore is 49.49 dollars/t, particularly, the high-yield strategy is still maintained in the inverse market in international majors, the mainstream iron ore market is further monopolized by increasing the production and lowering the price, and domestic large and medium iron ore enterprises face greater survival pressure.
In order to gradually establish an operation development mode suitable for a new normal state of a mine, mine mining and selecting enterprises in China urgently need to accelerate mine scientific and technological progress and innovation, give full play to the existing capacity potential, reduce the production cost of the enterprises, and improve the core competitiveness of the enterprises, namely the sole way of standing stable heels in the weak low-level operation of the market and ensuring the flourishing sustainable development of the mining industry.
In recent years, in order to improve the production efficiency of surface mines and reduce the transportation cost, a plurality of surface stopes are provided with adaptive crushing equipment to form surface crushing stations, so that continuous mining exploitation is realized. Chinese invention patent, application number: 201310292585.4, publication date: 2013.10.02 discloses a deep concave open slope promotes broken system, at the top of deep concave open stope and be located orbital below and be equipped with crushing station receiving groove and coarse crusher, the mine car promotes to deep concave open stope top through the hoist engine, unloads the ore into crushing station receiving groove, and the ore transports to the selection factory or refuse dump with the sealing-tape machine after passing through the coarse crusher breakage. In this patent, the coarse crushing station is set up in the stope, but the medium crushing system is in the mill. The coarse crushing product has large granularity, and can cause huge abrasion to a conveying belt, a funnel lining plate and the inner wall of a coarse crushing product cylindrical bin in the process of being conveyed to a selection plant from a stope. The ores are directly transported to a separation plant after being coarsely crushed, and dry magnetic separation and tailing discarding operation is not carried out, so that 'throwing early discarding' cannot be realized.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides a lean magnetite beneficiation production system, aiming at the problems that in the prior art, the coarse crushing product has large granularity in the lean magnetite beneficiation process, each device can be greatly abraded in the process of transporting the lean magnetite from a stope to a beneficiation plant, and the 'throwing and early throwing' can not be realized. It is through leading well garrulous device, has realized the purpose of "throwing early and losing" early to finally realize the effective reduction of the power consumption and the material consumption of ore dressing technology, reduced manufacturing cost, reduce the emission of ore dressing later stage solid waste, promoted economic benefits.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a lean magnetite ore dressing process is characterized in that a middle crushing device is moved to an ore stope, and the steps are as follows:
A. coarse crushing: carrying out coarse crushing on lean magnetite in a coarse crusher in an ore stope, and screening by a screening machine after coarse crushing;
B. crushing in middle: b, directly feeding the undersize products obtained in the step A into a medium crusher for crushing in an ore stope;
C. magnetic separation: directly carrying out dry magnetic separation on the crushed material in the step B in an ore stope, and then discarding the waste rocks;
D. transferring: conveying the coarse concentrate obtained in the previous step to a fine crushing and sorting operation area of a subsequent ore dressing area;
through leading to the ore stope with well garrulous device, directly carry out coarse crushing and well garrulous and dry-type magnetic separation work in the stope, realized tailing barren rock "throw early the purpose of losing" to improve the grade of rough concentrate, reduced the ore transportation volume, reduced the ore cost of transportation, prolonged belt and magnet separator funnel welt life, thereby the effectual mine operation cost that has reduced.
Preferably, the iron grade of the lean magnetite ore in the step A is 18-22%, when the iron grade is too low, the lean magnetite ore has no mining value, when the iron grade is too high, a medium crushing device does not need to be arranged in front, and after mining and coarse crushing, the lean magnetite ore is directly conveyed to a beneficiation area for processing; transferring the oversize product obtained in the step A into a coarse crusher for coarse crushing, so that the ore utilization rate is improved; coarse crushing to a particle size of 0-300 mm, so as to facilitate further crushing treatment of the medium crusher.
Preferably, in the step B, the medium-sized particles are crushed to a particle size of 0-70 mm, so that the magnetic separation work of the permanent magnet dry magnetic separator is facilitated, the impact of the ore on a hopper and a cylindrical bin of the magnetic separator is greatly reduced, and the abrasion of the ore on a conveying belt is reduced; and D, completing the weak magnetic dry magnetic separation in the step C by using a permanent magnetic dry magnetic separator so as to adapt to the magnetic separation of ores with the maximum particle size of 70 mm.
Preferably, the method is suitable for the lean magnetite ore with the content of magnetic iron being more than 70%; the field intensity of the permanent magnet dry magnetic separator is 0.3-0.6T; in the step B, the medium crushing granularity is 20-25% of 40-70 mm, 50-55% of 10-40 mm and 20-25% of 10mm below; the three technical characteristics act synergistically to achieve a better magnetic separation effect, and the grade of the rough concentrate can be improved in an ore stope;
preferably, the linear velocity of the surface of the cylinder of the permanent magnet dry magnetic separator is 1.6-2.5 m/s, the distance of the partition plates is 100-140 mm, and a good foundation is laid for further improving the grade of rough concentrate and discarding waste ore with the largest amount of tailings.
Preferably, in the step C, the medium crushed product is screened into two or three grades and then is subjected to dry magnetic separation respectively, so that the magnetic separation efficiency is improved, and the loss of high-grade ores is prevented.
Preferably, the method also comprises the step of controlling the product granularity within 70mm through pre-screening or inspection before magnetic separation, so as to prevent large-granularity ores from entering a magnetic separation process to cause impact on a hopper and a silo of the magnetic separator.
Preferably, in the step D, the magnetic separation tailings and the waste rocks are transported to a dumping site by a belt conveyor, and the magnetic separation rough concentrates are transported to a subsequent fine crushing and sorting operation area by the belt conveyor and separately transported to different areas, so as to avoid mixing and causing unnecessary secondary processing.
Preferably, in the step C, dry type medium field strong magnetic separation is carried out on the product with the medium crushing granularity of 40-70 mm, weak magnetic dry type magnetic separation is carried out on other granularities, and the magnetic separation efficiency can be ensured and unnecessary waste of the magnetic field intensity can be avoided by pertinence configuration of ores with different particle sizes.
A production system for lean magnetite ore dressing process is suitable for lean magnetite open-pit mines; the method comprises a coarse crusher, a screening machine, a middle crusher and a magnetic separator which are sequentially arranged in an ore stope according to a production line, a rubber belt conveyor I for conveying tailings and waste rocks after magnetic separation to a dumping site and a rubber belt conveyor II for conveying coarse concentrate after magnetic separation to subsequent processes, wherein the subsequent processes are carried out in a mineral separation area, so that the area for mining the iron ore is expanded, and the method is particularly worthy of popularization and application in terms of the national mineral reality mainly including the lean iron ore.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the lean magnetite ore dressing process, the middle crushing device is arranged in front of the ore stope, and the coarse crushing, the middle crushing and the dry magnetic separation are directly carried out in the stope, so that the purpose of early throwing and early losing of tailing waste stones is realized, the grade of coarse concentrate is improved, the ore transportation amount is reduced, the ore transportation cost is reduced, the service lives of a belt and a funnel lining plate are prolonged, and the mine operation cost is effectively reduced;
(2) the lean magnetite ore beneficiation process is more effective for magnetite ores with the grade of 18-22%, and through the summary of years of experience of the inventor in a steel plant, under the prior art condition, less than 22% of magnetite ores, because the production cost is high, the method is not suitable for further processing after being conveyed to a mineral separation area for a long distance, it is a subject to be studied if the grade can be improved in the stope area, and therefore, the inventor proposes and implements the creative idea of the front-end crushing device to improve the lean magnetite ore to more than 22% in the stope to obtain good technical effect, and certainly, after the middle crushing device is used for processing, the degree of improving the grade of the iron ore is limited, about 4 percent at most, if the grade is lower than 18 percent, the grade is not improved by more than 22 percent, and no further processing value exists, so that the waste of the lean magnetite production process is caused; transferring oversize materials obtained in the step A into a coarse crusher for coarse crushing, and repeatedly crushing ores with the granularity of more than 300mm to avoid waste; coarsely crushing to a granularity of 0-300 mm, and being suitable for further treatment of a medium crusher;
(3) according to the lean magnetite ore dressing process, the middle-grade crushing is carried out until the granularity is 0-70 mm, so that the magnetic separation work of the permanent magnet dry magnetic separator is facilitated, the impact of the ore on a hopper and a cylindrical bin of the magnetic separator is greatly reduced, and the abrasion of the ore on a conveying belt is reduced; the dry magnetic separation is completed by a permanent magnetic dry magnetic separator so as to be suitable for the magnetic separation of ores with the maximum grain size of 70 mm;
(4) according to the lean magnetite ore dressing process, the content of the magnetic iron is more than 70%, the lean magnetite ore dressing process is matched with a permanent magnet dry magnetic separator with the field intensity of 0.3-0.6T, and the lean magnetite ore dressing process is matched with the particle size distribution with the medium-crushed particle size of 20-25% of 40-70 mm, the content of 10-40 mm of 50-55% and the content of 20-25% below 10mm, so that a better magnetic separation effect is achieved and the grade of coarse concentrate is improved;
(5) according to the lean magnetite ore dressing process, the linear velocity of the surface of the cylinder of the permanent magnet dry magnetic separator is 1.6-2.5 m/s, the distance between the partition plates is 100-140 mm, the process parameters are better for the permanent magnet dry magnetic separator obtained by the inventor by integrating all factors and collecting data for creative labor such as arrangement and analysis, and a good foundation is laid for further improving the grade of rough concentrate and discarding waste ores with the tailings as much as possible;
(6) according to the lean magnetite ore dressing process, the medium crushed products are subjected to graded magnetic separation, so that the magnetic separation efficiency is improved, and the loss of high-grade ores is prevented;
(7) according to the lean magnetite beneficiation process, the product granularity is controlled within 70mm through pre-screening or inspection, and the impact of large-granularity ores entering a magnetic separation process on a hopper and a cylindrical bin of a magnetic separator is prevented;
(8) according to the lean magnetite ore dressing process, the waste rocks and the rough concentrate are separately conveyed by using the belt conveyor, so that unnecessary secondary processing caused by mixing is avoided;
(9) according to the lean magnetite ore dressing process, medium-field strong magnetic separation and small-particle-size weak magnetic separation are performed relative to large particle size, and the specific configuration is adopted, so that the magnetic separation efficiency can be ensured, and unnecessary waste of the magnetic field intensity can be avoided;
(10) the production system for the lean magnetite beneficiation process takes the magnetic separation procedure as a boundary to divide two areas, namely an ore stope and a beneficiation area, is suitable for mining lean magnetite open-pit mines, expands the area for mining iron ores, and is particularly worthy of popularization and application for the national mineral product reality mainly based on lean magnetite.
Drawings
FIG. 1 is a schematic layout of a production system of the present invention;
FIG. 2 is a flow chart of the quality of the test data of the present invention.
The reference numerals in the schematic drawings illustrate: 1. an ore stope; 2. and (4) selecting a mine area.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The lean magnetite beneficiation process is applied to a certain lean magnetite open-pit mine, the iron grade of raw ore is 18-22%, iron minerals in the ore are mainly magnetite, the content of magnetic iron is about 70% (accounting for the total iron content), and the operation steps are as follows:
A. coarse crushing: carrying out coarse crushing on lean magnetite in a coarse crusher in an ore stope 1, and screening by a screening machine after coarse crushing;
B. crushing in middle: directly feeding the undersize products obtained in the step A into a medium crusher for crushing in an ore stope 1;
C. magnetic separation: directly carrying out dry magnetic separation on the crushed material in the step B in an ore stope 1, and then discarding the waste rocks;
D. transferring: the coarse concentrate obtained in the previous step is conveyed to a fine crushing and sorting operation area of a subsequent ore dressing area 2;
through leading to the ore stope with well garrulous device, directly carry out coarse crushing and well garrulous and dry-type magnetic separation work in the stope, realized tailing barren rock "throw early the purpose of losing" to improve the grade of rough concentrate, reduced the ore transportation volume, reduced the ore cost of transportation, prolonged belt and magnet separator funnel welt life, thereby the effectual mine operation cost that has reduced.
The ore dressing process for lean magnetite ore of the embodiment is more effective especially for magnetite ore with the grade of 18-22%, and through the summary of years of experience of the inventor in steel plants, under the prior art condition of less than 22% magnetite ore, because the production cost is high, the method is not suitable for further processing after being conveyed to a mineral separation area for a long distance, it is a subject to be studied if the grade can be improved in the stope area, and therefore, the inventor proposes and implements the creative idea of the front-end crushing device to improve the lean magnetite ore to more than 22% in the stope to obtain good technical effect, and certainly, after the middle crushing device is used for processing, the degree of improving the grade of the iron ore is limited, about 4 percent at most, if the grade is lower than 18 percent, the grade is not improved by more than 22 percent, and no further processing value exists, so that the waste of the lean magnetite production process is caused. Of course, if the grade is higher than 22%, the intermediate crushing device is not needed to be arranged in front, and after the coarse crushing, the ore can be directly conveyed to the ore dressing area for processing.
Example 2
The lean magnetite beneficiation process of the embodiment is basically the same as the embodiment 1, and the improvement is that: transferring the oversize product obtained in the step A into a coarse crusher for coarse crushing, so that the ore utilization rate is improved; coarse crushing to a particle size of 0-300 mm, so as to facilitate further crushing treatment of the medium crusher. In the step B, crushing the medium particles to the particle size of 0-70 mm so as to facilitate the magnetic separation work of the permanent magnet dry magnetic separator, greatly reduce the impact of the ore on a hopper and a cylindrical bin of the magnetic separator and reduce the abrasion of the ore on a conveying belt; and D, completing the weak magnetic dry magnetic separation in the step C by using a permanent magnetic dry magnetic separator so as to adapt to the magnetic separation of ores with the maximum particle size of 70 mm.
Example 3
The ore dressing process for lean magnetite ore of the embodiment has the specific steps as in embodiment 2, and is improved in that: the field intensity of the permanent magnet dry magnetic separator is 0.3T; in the step B, the medium crushing granularity is 20 percent of 40-70 mm, 55 percent of 10-40 mm and 25 percent of below 10 mm; the method is suitable for lean magnetite ore with the content of magnetic iron being more than 70 percent; the three technical characteristics act synergistically to achieve a better magnetic separation effect and achieve the purpose of improving the grade of rough concentrate in an ore stope.
Example 4
The lean magnetite beneficiation process of the present embodiment is substantially the same as that of embodiment 3, and the differences and improvements are as follows: the field intensity of the permanent magnet dry magnetic separator is 0.6T; in the step B, the medium crushing granularity is 25 percent of 40-70 mm, 50 percent of 10-40 mm and 25 percent of below 10 mm. The linear velocity of the surface of the cylinder of the permanent magnet dry magnetic separator is 1.6-2.5 m/s, the distance between the partition plates is 120mm, and a good foundation is laid for further improving the grade of rough concentrate and discarding waste ore with the largest amount of tailings.
Example 5
The ore dressing process of lean magnetite ore of the embodiment is basically the same as the embodiment 4, and the improvement is that: and C, screening the medium crushed products into two or three grades, and then respectively carrying out dry magnetic separation so as to improve the magnetic separation efficiency and prevent the loss of high-grade ores. And C, the step of controlling the product granularity within 70mm through pre-screening and inspection before the magnetic separation in the step C is further included, so that the impact on a hopper and a silo of the magnetic separator caused by the fact that large-granularity ores enter a magnetic separation process is prevented. And D, conveying the magnetic separation tailings and the waste rocks to a dumping site by using a rubber belt conveyor, conveying the magnetic separation rough concentrates to a subsequent fine crushing and sorting operation area by using the rubber belt conveyor, and separately conveying the magnetic separation rough concentrates to different areas to avoid mixing to cause unnecessary secondary processing.
Example 6
The lean magnetite beneficiation process is applied to a certain beneficiation plant of a certain mining company, the ore mainly comprises magnetite, the raw ore grade is 20.75%, the content of magnetic iron is 14.01% (total content), the specific steps are basically the same as those of the example 5, and the improvement is that: in the step C, performing dry medium-field strong magnetic separation on a product with medium crushing granularity of 40-70 mm, wherein the field intensity is 0.6T; and other granularities are subjected to weak magnetic dry magnetic separation, the field intensity is 0.3T, and the magnetic separation efficiency can be ensured and unnecessary waste of the magnetic field intensity can be avoided by pertinently configuring ores with different grain diameters. In the process, a test data quality flow chart is shown in fig. 2, after the medium crushed product and the product which is pre-screened before medium crushing are subjected to sample preparation and are subjected to dry magnetic separation and waste disposal, the grade of the raw ore is improved by 1.33 percent, and the grade of the magnetic iron is improved by 2.09 percent; tailings with the yield of 11.98% and the iron grade of 10.98% can be discarded, and through detection, the magnetic iron grade of the tailings is only 0.52%, and the loss of magnetic iron in the tailings is 0.39%.
Example 7
The production system for the lean magnetite beneficiation process of the embodiment has the specific steps basically the same as those of the embodiments 1 to 6, and is suitable for lean magnetite open-pit mines; as shown in figure 1, the system comprises a coarse crusher, a screening machine, a middle crusher and a magnetic separator which are sequentially arranged in an ore stope 1 according to a production line, a rubber belt conveyor I for conveying tailings and waste rocks after magnetic separation to a dumping site and a rubber belt conveyor II for conveying coarse concentrate after magnetic separation to subsequent processes, wherein the subsequent processes are carried out in a beneficiation area 2, the magnetic separator can be a permanent magnet dry type magnetic separator, the linear velocity of the surface of a cylinder body is 1.6-2.5 m/s, and the distance of a partition plate is 100-140 mm.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (1)
1. The utility model provides a poor magnetite's ore dressing production system which characterized in that: the method is suitable for poor-magnet open-pit mines, the iron grade is 18-22%, and the content of the magnetic iron is more than 70%; the magnetic separation method comprises a coarse crusher, a screening machine, a middle crusher, a permanent magnetic dry magnetic separator, a rubber belt conveyor I and a rubber belt conveyor II, wherein the coarse crusher, the screening machine, the middle crusher and the permanent magnetic dry magnetic separator are sequentially arranged in an ore stope (1) according to a production line, the rubber belt conveyor I is used for conveying magnetic separation tailings and waste rocks to a dumping yard, and the rubber belt conveyor II is used for conveying magnetic separation rough concentrates to subsequent processes, and the subsequent processes are carried out in a mineral separation area; the linear velocity of the surface of the cylinder of the permanent magnet dry magnetic separator is 1.6-2.5 m/s, and the distance of the partition plates is 100-140 mm; the specific application steps are as follows:
A. coarse crushing: carrying out coarse crushing on lean magnetite in a coarse crusher in an ore stope (1), and screening by a screening machine after coarse crushing; transferring the oversize product into a coarse crusher for coarse crushing; coarsely crushing to a particle size of 0-300 mm;
B. crushing in middle: directly feeding the undersize material obtained in the step A into a medium crusher for crushing in an ore stope (1) until the granularity is 0-70 mm, wherein the medium crusher has the granularity of 20-25% of 40-70 mm, 50-55% of 10-40 mm and 20-25% of 10mm below;
C. magnetic separation: controlling the product granularity within 70mm through pre-screening and inspection before magnetic separation, and then performing dry magnetic separation on the crushed material obtained in the step B in an ore stope (1) through a permanent magnet dry magnetic separator, and discarding magnetic separation tailings and waste rocks, wherein the field intensity of the permanent magnet dry magnetic separator is 0.3-0.6T; screening the medium crushed products into two or three grades, then respectively carrying out dry magnetic separation, and carrying out dry medium field high intensity magnetic separation on the products with the medium crushed particle size of 40-70 mm, wherein the field intensity is 0.6T; performing weak magnetic dry magnetic separation on other granularities with the field intensity of 0.3T;
D. transferring: and C, conveying the rough concentrate obtained in the step C to a fine crushing and sorting operation area of a subsequent ore dressing area (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135696.3A CN109351447B (en) | 2016-08-15 | 2016-08-15 | Lean magnetite's ore dressing production system |
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| CN201811135696.3A CN109351447B (en) | 2016-08-15 | 2016-08-15 | Lean magnetite's ore dressing production system |
| CN201610669412.3A CN106111297B (en) | 2016-08-15 | 2016-08-15 | A kind of ore-dressing technique and its production system of chromium depleted zone |
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| CN201610669412.3A Division CN106111297B (en) | 2016-08-15 | 2016-08-15 | A kind of ore-dressing technique and its production system of chromium depleted zone |
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| CN109351447A CN109351447A (en) | 2019-02-19 |
| CN109351447B true CN109351447B (en) | 2020-10-27 |
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| CN201811135696.3A Active CN109351447B (en) | 2016-08-15 | 2016-08-15 | Lean magnetite's ore dressing production system |
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| CN107552221A (en) * | 2017-09-06 | 2018-01-09 | 安徽马钢工程技术集团有限公司 | A kind of chromium depleted zone coarse grain wet type pre-selecting tailings discharging technique and system |
| CN109127079A (en) * | 2018-08-14 | 2019-01-04 | 枣庄鑫金山智能机械股份有限公司 | A kind of compound poor iron ore pre-selection production system |
| CN109317309A (en) * | 2018-08-31 | 2019-02-12 | 福建金东矿业股份有限公司 | A kind of magnetic separator and its beneficiation method |
| CN109530048B (en) * | 2018-09-26 | 2021-01-29 | 滦平县宝蓝中矿业有限公司 | Method for rapidly obtaining magnetite concentrate by impact crushing |
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| CN109759232B (en) * | 2019-02-28 | 2020-06-16 | 玉溪大红山矿业有限公司 | Method for reducing volume weight of low-grade stones through dry magnetic separation |
| CN110385165B (en) * | 2019-07-31 | 2021-05-14 | 承德县金宜矿业有限公司 | Ore dressing process containing magnetite |
| CN110479467A (en) * | 2019-08-28 | 2019-11-22 | 马钢集团设计研究院有限责任公司 | A kind of high pressure roller mill dry screening wet type pre-selecting technique of chromium depleted zone stone |
| CN112808432A (en) * | 2021-03-19 | 2021-05-18 | 辽宁科技学院 | Processing technology for lean ore two-stage dry magnetic separation three-stage crushing |
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