CN104874459A - Low-grade magnetite pre-selection and waste abandoning mineral separation process - Google Patents

Low-grade magnetite pre-selection and waste abandoning mineral separation process Download PDF

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CN104874459A
CN104874459A CN201510231808.5A CN201510231808A CN104874459A CN 104874459 A CN104874459 A CN 104874459A CN 201510231808 A CN201510231808 A CN 201510231808A CN 104874459 A CN104874459 A CN 104874459A
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ore
paragraph
segment
section
sieve
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CN104874459B (en
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王福元
张雯雯
王莉萌
袁国才
雷存友
胡根华
李宏建
陈小爱
金吉梅
杨斌
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China ruim engineering technology Limited by Share Ltd
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China Nerin Engineering Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material

Abstract

The invention discloses a low-grade magnetite pre-selection and waste abandoning mineral separation process. The process comprises the following steps: carrying out coarse crushing, carrying out medium crushing, carrying out first-section sieving, carrying out first-section pre-selection and waste abandoning, carrying out fine crushing, carrying out ultrafine crushing, carrying out second-section sieving, and carrying out second-section pre-selection and waste abandoning. After raw ores are subjected to the coarse crushing and the medium crushing, three products are sieved by the first-section sieving; oversize products obtained after the first-section sieving is finely crushed through ore concentrate which is obtained by the first-section pre-selection and waste abandoning to form a fine crushing closed cycle; sized products obtained after the first-section sieving and the oversize products obtained after the second-section sieving are finely crushed and then are returned back to the second-section sieving to form an ultrafine crushing closed cycle; undersize products obtained after the first-section sieving and undersize products obtained after the second-section sieving are subjected to the second-section pre-selection and waste abandoning, and tailings in the first-section pre-selection and tailings in the second-section pre-selection are final tailings; and ore concentrate in the second-section pre-selection is a final product. According to the low-grade magnetite pre-selection and waste abandoning mineral separation process, a plurality of waste stones can be abandoned and the amount of ore entering a mill is reduced; the mill-entering grade of iron ores is improved, and the energy consumption and the consumption of steel balls can be reduced; and the development and the utilization of low-grade magnetite ores are facilitated, and the utilization rate of resources is expanded.

Description

Useless ore-dressing technique is thrown in a kind of low-grade magnetite preliminary election
Technical field
The invention belongs to ore-dressing technique fragmentation and Preconcentration Technology field, particularly useless ore-dressing technique is thrown in a kind of low-grade magnetite preliminary election.
Background technology
China's iron ore deposit feature is: resource gross reserves is large, but lean ore is many, and rich ore is few.The average Iron grade of China's iron ore deposit only has 33% (iron ore big export country grade is 55% ~ 65% in the world), and high-grad iron ore deposit reserves are less than 5%, and the poor iron ore of more than 95% just need can send blast furnace process after beneficiation enrichment.In addition, ore can be mixed into a certain amount of country rock in recovery process.Therefore, iron ore of low ore grade as complete through fragmentation, ore grinding, sort, the operation such as the last person will cause ore dressing expense cost to increase, and country rock easy argillization in grinding process, will affect the raising of iron concentrate grade.
Improve the utilization rate of China's low-grade iron ore resource, it is crucial for reducing mineral processing production cost.Have two key points can reduce the beneficiation cost of low-grade iron ore:
(1) much broken and lessmill: in metal mine is produced, energy consumption and steel consumption account for 60% ~ 70% of ore dressing plant production cost, and therefore, in Designing Ore-Dressing Plants, the selection of rock processing is very large on production cost impact.Due to the energy consumption much less that the ore of the same granularity of fragmentation is more used than ore grinding, therefore " much broken and lessmill " technology is one of focus of domestic and international Mineral Processing Industry concern always.At present, at home and abroad in ore dressing crushing process technology, big-and-middle-sized ore dressing plant substantially all adopts Three stage crushing with single closed circuit stage technique, broken final products granularity d 95be generally-12mm.The small-sized ore dressing plant of a part adopts two sections of open circuit crushings or two sections of closed circuit crushing techniques, broken final products granularity d 95be generally-20mm.
(2) early throwing can be thrown: throw except barren rock before ore grinding, improve iron ore and enter to grind grade, realize the energy-saving and cost-reducing of ore dressing plant, reduction beneficiation cost.Existingly select factory to throw useless technique in two sections or three sections of crushing process, mainly to adopt one section of dry type pre-separation using magnetic pulley to throw useless or one section of dry-type magnetic extractor throw useless.The shortcoming of existing technique is: raw ore its ore grain size after two sections or three sections of fragmentations is also comparatively large, and ore degree of dissociation is inadequate, is difficult to reach satisfied throwing and gives up effect.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of low-grade magnetite preliminary election and throw useless ore-dressing technique, realize much broken and lessmill, save energy and reduce the cost; After lump ore and the throwing of fine ore two stages of magnetic separation give up, remove most of barren rock, reduce into ore grinding amount, improve into mill iron ore grade, reduce the type selecting of follow-up mill optional equipment, and then reduce construction investment and the minimizing of ore grinding amount, further realization is saved energy and reduce the cost, and reduces beneficiation cost.
The present invention is achieved through the following technical solutions above-mentioned purpose.Useless ore-dressing technique is thrown in a kind of low-grade magnetite preliminary election, it is characterized in that: its processing step is as follows:
1) coarse crushing: the low-grade raw iron ores from stope is transported to the crude ore bin selecting factory's coarse crushing workshop, then the upper lump ore of sieve and minus sieve ore deposit is divided into through grizzly feeder, on sieve, lump ore feeds jaw crusher and carries out coarse crushing, broken product storage bin during the minus sieve ore deposit of its product A and grizzly feeder is transported in the lump;
2) broken in: in ore broken gyratory crusher in belt feeder feeds in broken product storage bin broken in carrying out, its product B and products C in small, broken bits be transported in the lump in small, broken bits before first paragraph sieve product storage bin;
3) first paragraph screening: the ore in first paragraph screening product storage bin feeds the round sieve that shakes through oscillating feeder and carries out first paragraph screening, product and first paragraph undersize in output first paragraph oversize, first paragraph sieve;
4) first paragraph preliminary election is thrown useless: first paragraph oversize feeds magnetic pulley to carry out first paragraph preliminary election and throw useless, and first paragraph preliminary rejection and second segment preliminary rejection are transported to refuse bin in the lump, then transport barren rock stockyard to; The pre-concentrate selection of first paragraph is transported to product storage bin in small, broken bits;
5) in small, broken bits: the ore in product storage bin in small, broken bits feeds gyratory crusher in small, broken bits through belt feeder and carries out in small, broken bits, its products C returns front first paragraph screening in small, broken bits, forms closed circuit crushing in small, broken bits circulation;
6) ultrafine grinding: in first paragraph sieve, product and second segment oversize are transported to ultrafine grinding product storage bin in the lump, then feed in vertical shaft impact crusher through belt feeder and carry out ultrafine grinding, its product D is transported to second segment and sieves product storage bin;
7) second segment screening: the ore in second segment screening product storage bin feeds the round sieve that shakes by oscillating feeder and carries out second segment screening; This screening operation output two products, be respectively second segment oversize and second segment undersize, second segment oversize returns ultrafine grinding product storage bin, forms ultrafine grinding closed circuit crushing circulation;
8) second segment preliminary election is thrown useless: first paragraph undersize and second segment undersize feed in fine ore dry separator and carry out second segment preliminary election and throw useless, and second segment preliminary rejection is transported to refuse bin in the lump with first paragraph preliminary rejection after transhipment; The pre-concentrate selection of second segment is that final products send into mill choosing.
Further, described first paragraph screening and second segment screening plant are heavy circular shale shaker.
Further, the upper and lower layer mesh size of described first paragraph vibratory sieve is respectively 35 × 35mm, 7.5 × 7.5mm.
Further, described second segment vibratory sieve is that double deck screen does single-deck screen use, and its upper and lower layer mesh size is respectively 15 × 15mm, 7.5 × 7.5mm.
Further, the ultrafine grinding equipment that described 4th section of fragmentation uses is vertical shaft impact crusher.
The present invention have passed through four fragmentations, twice closed circuit screening and twice preliminary election to low-ore grade magnetic iron ore and throws useless operation, reach the object that less ore grain size enters ore grinding, most of barren rock can be discarded, the final products granularity of ore is 0 ~ 6mm, decreases into ore grinding amount, improves iron ore and enters to grind grade, capable of reducing energy consumption and steel ball consumption, and then reduce the production cost of ore dressing, be conducive to the exploitation of low-grade magnetite ore, expand resource utilization.
Accompanying drawing explanation
Fig. 1 is the process chart that useless ore-dressing technique is thrown in low-grade magnetite preliminary election of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.See Fig. 1, useless ore-dressing technique is thrown in a kind of low-grade magnetite preliminary election of the present invention, is realized by following step:
1) coarse crushing 5: the low-grade raw iron ores 1 from stope is transported to the crude ore bin selecting factory's coarse crushing workshop, then the upper lump ore 3 of sieve and minus sieve ore deposit 4 is divided into through grizzly feeder 2, on sieve, lump ore 3 feeds jaw crusher and carries out coarse crushing 5, broken product storage bin during its product A 6 and the minus sieve ore deposit 4 of grizzly feeder 2 are transported in the lump;
2) in broken 7: in ore in broken product storage bin broken gyratory crusher in carrying out broken 7 in belt feeder feeds, its product B 8 with in small, broken bits 16 products C 17 be transported to the first paragraph before in small, broken bits 16 in the lump and sieve product storage bin;
3) first paragraph screening 9: the ore in first paragraph screening product storage bin feeds the round sieve that shakes through oscillating feeder and carries out first paragraph screening 9; This screening operation output three products, being respectively first paragraph oversize 10(, to go first paragraph preliminary election to throw useless), in first paragraph sieve product 11(remove ultrafine grinding) and first paragraph undersize 12(go second segment preliminary election to throw to give up);
4) first paragraph preliminary election throws useless 13: first paragraph oversize 10(+30mm) feed magnetic pulley and carry out first paragraph preliminary election and throw useless 13, first paragraph preliminary rejection 14 and second segment preliminary rejection 24 are transported to refuse bin in the lump, then transport barren rock stockyard to; The pre-concentrate selection of first paragraph 15 is transported to product storage bin in small, broken bits;
5) in small, broken bits 16: the ore in product storage bin in small, broken bits feeds gyratory crusher in small, broken bits through belt feeder and carries out in small, broken bits 16, its products C 17 returns front first paragraph screening 9 in small, broken bits, forms closed circuit crushing in small, broken bits circulation;
6) ultrafine grinding 18: product 11(-30+6mm in first paragraph sieve) be transported to ultrafine grinding product storage bin in the lump with second segment oversize 21, feed in vertical shaft impact crusher through belt feeder and carry out ultrafine grinding 18, its product D19 is transported to second segment screening product storage bin;
7) second segment screening 20: the ore in second segment screening product storage bin feeds the round sieve that shakes by oscillating feeder and carries out second segment screening 20; This screening operation output two products, be respectively second segment oversize 21(and remove ultrafine grinding) and second segment undersize 22(to go second segment preliminary election to throw useless), second segment oversize 21(+6mm) return ultrafine grinding product storage bin, form ultrafine grinding closed circuit crushing circulation;
8) second segment preliminary election throws useless 23: first paragraph undersize 12(-6mm) and second segment undersize 22(-6mm) feed in fine ore dry separator and carry out second segment preliminary election throwing useless 23, second segment preliminary rejection 24 is transported to refuse bin in the lump with first paragraph preliminary rejection 14 after transhipment; The pre-concentrate selection 25 of second segment is sent into mill for final products and is selected.
embodiment:as shown in Figure 1, being achieved in that stope is transported to according to the useless ore-dressing technique of a kind of low-grade magnetite preliminary election throwing of the present invention selects the raw iron ores 1 of factory's crude ore bin to be divided into the upper lump ore 3 of sieve and minus sieve ore deposit 4 through grizzly feeder 2; On sieve, lump ore 3 obtains product A 6 through coarse crushing 5; Minus sieve ore deposit 4 and product A 6 in the lump through in broken 7 product B 8; Product B 8 and products C in small, broken bits 17 feed first paragraph screening 9 in the lump and sieve out product 11 and first paragraph undersize 12 in first paragraph oversize 10, first paragraph sieve; First paragraph oversize 10 feeds magnetic pulley and carries out first paragraph preliminary election throwing useless 13, obtains first paragraph preliminary rejection 14 and the pre-concentrate selection 15 of first paragraph after sorting; The pre-concentrate selection of first paragraph 15 feeds in small, broken bits 16 and obtains products C 17, and products C 17 returns first paragraph screening 9, forms closed cycle in small, broken bits; In first paragraph sieve, product 11 and second segment oversize 21 feed ultrafine grinding 18 in the lump and obtain product D19, product D19 feeds second segment screening 20 and sieves out second segment oversize 21 and second segment undersize 22, second segment oversize 21 returns ultrafine grinding 18, forms ultrafine grinding closed cycle; First paragraph undersize 12 and second segment undersize 22 feed fine ore dry separator in the lump and carry out second segment preliminary election throwing useless 23, and obtain second segment preliminary rejection 24 and the pre-concentrate selection 25 of second segment after sorting, the pre-concentrate selection of second segment 25 send follow-up mill to select; First paragraph preliminary rejection 14 and second segment preliminary rejection 24 merge into true tailings 26, send refuse bin.
First paragraph screening and second segment screening plant are heavy circular shale shaker, and first paragraph vibratory sieve levels mesh size is respectively 35 × 35mm, 7.5 × 7.5mm; Second segment vibratory sieve is that double deck screen does single-deck screen use, and its levels mesh size is respectively 15 × 15mm, 7.5 × 7.5mm.
The 4th section of broken ultrafine grinding equipment used is vertical shaft impact crusher, and this equipment is the novel device for the operation of metal mine ultrafine grinding.
It is useless that certain low-grade iron ore mountain adopts above-mentioned several step to carry out fragmentation throwing, and throw after useless sorting through two stages of magnetic separation, the barren rock productive rate discarded reaches 31%, enters to grind iron ore grade and improves about 10%.
What this iron ore mine was exploited out is low-ore grade magnetic iron ore.Ore Mineral Component is mainly magnetic iron ore, martite, fine flakey bloodstone, limonite, and objectionable impurities mineralogical composition is pyrite etc.; Gangue mineral is mainly acinous quartz, calcedony, albite, chlorite, calcite, ankerite, apatite etc.This low-ore grade magnetic iron ore iron content is 29.85%, and this mine concentrator day process raw ore scale is 11510t.This iron ore fragmentation is thrown useless technical process and is summarized as follows:
Raw ore (0 ~ 950mm) from stope is transported to the crude ore bin selecting factory's coarse crushing workshop through automobile, then after grizzly feeder screening, the upper lump ore of sieve feeds jaw crusher and carries out coarse crushing, the minus sieve ore deposit broken product storage bin in rubber conveyer is transported in the lump of its product and grizzly feeder, more broken gyratory crusher is broken in carrying out in belt feeder feeds; In broken product and product in small, broken bits be transported to front first paragraph in small, broken bits through rubber conveyer in the lump and sieve product storage bin, the circle feeding first paragraph screening through oscillating feeder again shakes sieve, this screening operation output three products, first paragraph oversize (+30mm) feeds magnetic pulley through rubber conveyer to carry out first paragraph preliminary election and throws useless, discard the barren rock of 10%, first paragraph preliminary rejection unloads to rubber conveyer, refuse bin is transported in the lump with second segment preliminary rejection, then be discharged into automobile through electric hydraulic palate-type gate, transport barren rock stockyard to; The pre-concentrate selection of first paragraph is transported to product storage bin in small, broken bits through rubber conveyer, then feeds gyratory crusher in small, broken bits through belt feeder and carry out in small, broken bits, its product unload to rubber conveyer return in small, broken bits before first paragraph screening, form closed circuit crushing in small, broken bits; In first paragraph sieve, product (-30+6mm) is discharged into rubber conveyer and second segment oversize (+6mm) is transported to ultrafine grinding product storage bin in the lump, feed vertical shaft impact crusher through belt feeder again and carry out ultrafine grinding, its product is transported to second segment screening product storage bin through rubber conveyer, then feeds by oscillating feeder the circle sieve that shakes that second segment sieves and sieves; Second segment sifts out two products, and second segment oversize (+6mm) is discharged into rubber conveyer and returns ultrafine grinding product storage bin, forms ultrafine grinding closed circuit crushing; First paragraph undersize (-6mm) and second segment undersize (-6mm) directly feed dry-type magnetic separator for ore fine to carry out second segment preliminary election and throws useless, discarded the barren rock of 21%, second segment preliminary rejection and first paragraph preliminary rejection are transported to refuse bin through rubber conveyer in the lump; The pre-concentrate selection of second segment (full Iron grade is about 39%) is transported to fine ore bin, then carries out follow-up mill choosing process.
Iron ore through four sections of fragmentations two sections are closed circuit be sized to final products granularity-6mm after to adopt wet magnetic separation preliminary election to throw useless, also can be undertaken designing, producing by this technical process.
Low-grade magnetite preliminary election of the present invention throws that useless ore-dressing technique have passed through four broken industry to low-ore grade magnetic iron ore, twice closed circuit screening operation, twice preliminary election are thrown useless, its advantage is: (1) fully implements " much broken and lessmill " theory, adopts four sections of fragmentations, two sections of closed circuit screenings by ore final size d 95control to-6mm, reach the object that less ore grain size enters ore grinding.(2) " can throw and early throw " theory is fully implemented, raw ore can produce different grades through four sections of fragmentations, two sections of closed circuit screenings: one be in small, broken bits after utilize magnetic pulley to be that 30 ~ 75mm lump ore carries out first paragraph preliminary election and throws useless to granularity, discard bulk barren rock early; Two is that ore final products granularity can make valuable mineral and gangue dissociate preferably when reaching-6mm, carries out second segment preliminary election throw useless with dry-type magnetic separator for ore fine, can carry out fully effective sorting, can discard most of barren rock to ore.The useless performance having given full play to two kinds of magnetic plants is thrown in two sections of preliminary elections, can discard most of barren rock, decrease into ore grinding amount, improve iron ore and enter to grind grade.Low-grade magnetite ore, after " how broken, early throw ", is the lectotype selection that identical scale ore dressing plant can reduce subsequent ball milling machine and sort on the one hand, and then saving equipment and construction investment; Energy-saving and cost-reducing on the other hand, capable of reducing energy consumption and steel ball consumption, and then the production cost reducing ore dressing.(3) adopt present invention process, utilize the advantage of " how broken, early throwing " greatly can reduce investment and production cost, be conducive to the exploitation of low-grade magnetite ore, expand resource utilization.

Claims (5)

1. a useless ore-dressing technique is thrown in low-grade magnetite preliminary election, it is characterized in that: its processing step is as follows:
1) coarse crushing: the low-grade raw iron ores from stope is transported to the crude ore bin selecting factory's coarse crushing workshop, then the upper lump ore of sieve and minus sieve ore deposit is divided into through grizzly feeder, on sieve, lump ore feeds jaw crusher and carries out coarse crushing, broken product storage bin during the minus sieve ore deposit of its product A and grizzly feeder is transported in the lump;
2) broken in: in ore broken gyratory crusher in belt feeder feeds in broken product storage bin broken in carrying out, its product B and products C in small, broken bits be transported in the lump in small, broken bits before first paragraph sieve product storage bin;
3) first paragraph screening: the ore in first paragraph screening product storage bin feeds the round sieve that shakes through oscillating feeder and carries out first paragraph screening, product and first paragraph undersize in output first paragraph oversize, first paragraph sieve;
4) first paragraph preliminary election is thrown useless: first paragraph oversize feeds magnetic pulley to carry out first paragraph preliminary election and throw useless, and first paragraph preliminary rejection and second segment preliminary rejection are transported to refuse bin in the lump, then transport barren rock stockyard to; The pre-concentrate selection of first paragraph is transported to product storage bin in small, broken bits;
5) in small, broken bits: the ore in product storage bin in small, broken bits feeds gyratory crusher in small, broken bits through belt feeder and carries out in small, broken bits, its products C returns front first paragraph screening in small, broken bits, forms closed circuit crushing in small, broken bits circulation;
6) ultrafine grinding: in first paragraph sieve, product and second segment oversize are transported to ultrafine grinding product storage bin in the lump, then feed in vertical shaft impact crusher through belt feeder and carry out ultrafine grinding, its product D is transported to second segment and sieves product storage bin;
7) second segment screening: the ore in second segment screening product storage bin feeds the round sieve that shakes by oscillating feeder and carries out second segment screening; This screening operation output two products, be respectively second segment oversize and second segment undersize, second segment oversize returns ultrafine grinding product storage bin, forms ultrafine grinding closed circuit crushing circulation;
8) second segment preliminary election is thrown useless: first paragraph undersize and second segment undersize feed in fine ore dry separator and carry out second segment preliminary election and throw useless, and second segment preliminary rejection is transported to refuse bin in the lump with first paragraph preliminary rejection after transhipment; The pre-concentrate selection of second segment is that final products send into mill choosing.
2. useless ore-dressing technique is thrown in low-grade magnetite preliminary election according to claim 1, it is characterized in that: described first paragraph screening and second segment screening plant are heavy circular shale shaker.
3. useless ore-dressing technique is thrown in low-grade magnetite preliminary election according to claim 2, it is characterized in that: the upper and lower layer mesh size of described first paragraph vibratory sieve is respectively 35 × 35mm, 7.5 × 7.5mm.
4. useless ore-dressing technique is thrown in low-grade magnetite preliminary election according to claim 2, it is characterized in that: described second segment vibratory sieve is that double deck screen does single-deck screen use, and its upper and lower layer mesh size is respectively 15 × 15mm, 7.5 × 7.5mm.
5. useless ore-dressing technique is thrown in low-grade magnetite preliminary election according to claim 1, it is characterized in that: the ultrafine grinding equipment that described 4th section of fragmentation uses is vertical shaft impact crusher.
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CN105498928A (en) * 2015-12-29 2016-04-20 安徽牛山新型材料科技有限公司 Equipment system for processing and utilization of low-grade sandstone
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CN113426688A (en) * 2021-06-25 2021-09-24 马钢集团设计研究院有限责任公司 Mineral processing technology of high-sulfur composite iron ore and preselection production system thereof

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