CN102228865B - Novel wet-type strong-magnetic pre-separation process of weak-magnetic low-grade iron mineral roller mill - Google Patents
Novel wet-type strong-magnetic pre-separation process of weak-magnetic low-grade iron mineral roller mill Download PDFInfo
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Abstract
The invention relates to the technical field of magnetite mineral separation, in particular to a novel wet-type strong-magnetic pre-separation process of a weak-magnetic low-grade iron mineral roller mill, which is realized by the following steps of: subjecting mineral separation coarse breaking, medium breaking, fine breaking and sieving operations to ores produced from a stope through excavation; feeding products obtained through fine breaking operation into a high-pressure roller mill for ore breaking; feeding products of the high-pressure roller mill to a roller mill for sieving; returning oversize products to the high-pressure roller mill for re-breaking; feeding undersize products for weak magnetic separation so that concentrate obtained through the weak magnetic separation becomes pre-separated concentrate; feeding tailings from the weak magnetic separation for strong magnetic separation so that concentrate obtained through strong magnetic separation becomes pre-separated concentrate and tailings subjected to the strong magnetic separation are final tailings; and mixing the concentrate obtained through the weak magnetic separation with the concentrate obtained through the strong magnetic separation to obtain raw ores of a ball grinding mill so that the tailings obtained through the strong magnetic separation become the final coarse grain-size tailings. By adopting the novel wet-type strong-magnetic pre-separation process of the weak-magnetic low-grade iron mineral roller mill in a mineral separation plant, the energy consumption can be reduced by 20-30 percent and the processing capacity is improved by 30-40 percent.
Description
Technical field
The present invention relates to the magnetite separation technical field, particularly a kind of weak magnetic low-grade iron ore thing roller grinds strong magnetic wet type pre-selecting new technology.
Background technology
The preliminary election technology of raw ore is the very effective measure that improves selected head grade, reduces power consume and improve the ore dressing economic benefit; Numerous dressers author goes to realize that in unremitting effort raw ore is gone into mill, selected grade maximizes always; Before 2000; Owing to receive the restriction of preparation equipment abilities such as disintegrating machine, magnetic separator, ore dressing production has only raw ore preliminary election technology such as the preliminary election of ferromagnetism iron ore product dry type, wet type pre-selecting, and factory is applied widely at magnetite separation.Domestic weakly magnetic iron ore preliminary election technology is at first used in Mei Shan mining company; Its gravity treatment workshop 20 (12)～2mm grade ores are with YCG-Φ 350 * 1000 coarse grain permanent magnetism roll-type high intensity magnetic separators, and the mine tailing after the choosing gets into YCG-Φ 350 * 1000 coarse grain permanent magnetism roll-type high intensity magnetic separators and selects.The preliminary rejection grade is reduced to 10-12%, has improved metal recovery rate, has accomplished to utilize economically mine resources.Coarse grain permanent magnetism roll-type high intensity magnetic separator belongs to dry type preliminary election technology, and its disposal ability is little, and upgrading is limited in one's ability, and management difficulty is bigger, never obtains wide popularization and application.
Along with the invention of high-pressure roller mill and vertical ring high-gradient high intensity magnetic separation equipment and perfect, the crushed product small grain size (3～0mm) and weakly magnetic iron ore coarse grain wet type pre-selecting can realize.
Summary of the invention
The object of the invention provides a kind of weak magnetic low-grade iron ore thing roller and grinds strong magnetic wet type pre-selecting new technology; For the weak magnetism mineral adopt high-pressure roller mill muck, Wet-type strong magnetic separator preliminary election; Abandon part coarse fraction non magnetic ore product before going into mill, make raw ore go into mill, selected grade maximization.
The objective of the invention is to realize through following technical proposals:
Weak magnetic low-grade iron ore thing roller of the present invention grinds strong magnetic wet type pre-selecting new technology; It is characterized in that: the raw ore ore is through high pressure roller mill crusher machine, Wet-type strong magnetic separator preliminary election; Abandon the non magnetic ore of 20-30%, improve the selected grade of ball mill, specifically realize by the following step:
(1) granularity of producing from the stope digging less than the ore of 1000mm through the coarse crushing of ore dressing, fragmentation, fine crushing, screening operation, ore grain size is less than 35mm,
(2) granularity feeds high-pressure roller mill less than 35mm crushing operation product and carries out muck, and its ore grain size of producing is less than 15mm,
(3) the high-pressure roller mill product is given to the roller mill screening operation, and the sieve aperture of screening machine is 6mm, returns the high pressure roller mill machine operation greater than the oversize of 6mm and carries out brokenly again, and granularity feeds the low intensity magnetic separation operation less than the undersize of 6mm,
(4) the low intensity magnetic separation concentrate becomes preliminary election concentrate product, and the low intensity magnetic separation mine tailing gets into the high intensity magnetic separation operation,
(5) the high intensity magnetic separation concentrate becomes preliminary election concentrate product, and the high intensity magnetic separation mine tailing becomes final preliminary rejection,
(6) low intensity magnetic separation concentrate and high intensity magnetic separation concentrate are mixed and are delivered to ball mill to ore storage bin, become the ball mill raw ore, and the high intensity magnetic separation mine tailing becomes final ore dressing plant coarse fraction mine tailing.
In the undersize of described granularity less than 6mm, granularity accounts for more than 80% less than 5mm, and granularity accounts for 59～61% less than 3mm.
Described high intensity magnetic separation magnetic field intensity is 0.9～1.0T, stroke: 8～10mm.
The objective of the invention is to go into mill and abandon part coarse fraction non magnetic ore product before, improve raw ore and go into mill, selected a kind of new technology of the maximized ore dressing of grade for the weak magnetism mineral adopt high-pressure roller mill muck, Wet-type strong magnetic separator preliminary election.Adopt high pressure roller mill crusher machine, Wet-type strong magnetic separator preliminary election, abandon the non magnetic ore of 20-30%, improve selected grade, realize throwing early throw, break more grind less, save energy and reduce the cost, reduce cost, benefit is better.
It is capable of reducing energy consumption 20～30% that the ore dressing plant adopts weak magnetic low-grade iron ore thing roller to grind strong magnetic wet type pre-selecting new technology, improves disposal ability 30～40%.Technological process can be simplified in newly-built ore dressing plant, practices thrift investment 25～30%, reduces the Operation and Maintenance expense, and ore adaptability is strong.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Below in conjunction with the description of drawings specific embodiment of the present invention.
As shown in Figure 1; Weak magnetic low-grade iron ore thing roller of the present invention grinds strong magnetic wet type pre-selecting new technology; It is characterized in that: the raw ore ore is through high pressure roller mill crusher machine, Wet-type strong magnetic separator preliminary election; Abandon the non magnetic ore of 20-30%, improve the selected grade of ball mill, specifically realize by the following step:
(1) granularity of producing from the stope digging less than the ore of 1000mm through the coarse crushing of ore dressing, fragmentation, fine crushing, screening operation, ore grain size is less than 35mm,
(2) granularity at first feeds preliminary election ore pocket 2 less than 35mm crushing operation product 1, and the crushed product 1 of ore pocket 2 gets into high pressure roller mill machine operation 3 mucks, and its ore grain size of producing is less than 15mm,
(3) high-pressure roller mill product 4 is given to screening machine 5 and carries out screening operation, and the sieve aperture of screening machine is 6mm, returns high-pressure roller mill 3 greater than the oversize 6 of 6mm and carries out crushing operation again, and granularity feeds low intensity magnetic separation operation 8 less than the undersize 7 of 6mm,
(4) low intensity magnetic separation concentrate 10 becomes preliminary election concentrate product 14, and low intensity magnetic separation mine tailing 9 gets into high intensity magnetic separation operation 11,
(5) high intensity magnetic separation concentrate 13 becomes preliminary election concentrate product, and high intensity magnetic separation mine tailing 12 becomes final preliminary rejection,
(6) low intensity magnetic separation concentrate and high intensity magnetic separation concentrate are mixed and are delivered to ball mill to ore storage bin, become the ball mill raw ore, and the high intensity magnetic separation mine tailing becomes final ore dressing plant coarse fraction mine tailing.
In the undersize of described granularity less than 6mm, granularity accounts for more than 80% less than 5mm, and granularity accounts for 59～61% less than 3mm.
High intensity magnetic separation magnetic field intensity of the present invention is 0.9～1.0T, stroke: 8～10mm.Its separation results is following: giving the ore deposit grade is 24.48%, inferior fine magnetite concentrate grade 35.00%, productive rate 53.00%; Strong magnetic concentrate grade 22.04%, productive rate 22.04%; Tailings grade 7.78%, productive rate 31.05%.
As shown in Figure 1; The product of former crushing process (granularity is 0-35mm) is the raw material 1 of preliminary election new technology; The muck product 4 of product 1 roller mill operation 3 gets into roller mill and beats screening operation 5; Return roller mill operation 3 through the later oversize 6 of screening operation 5 screenings, the undersize 7 that roller mill beats screening operation gets into low intensity magnetic separation operation 8, and low intensity magnetic separation operation 8 products from failing 9 feed high gradient intensity magnetic separator operation 11; The concentrate product 10 of intensity magnetic separator operation 11 concentrate products 13 and weak magnetic operation is mixed into the concentrate product 14 of preliminary election technology; Concentrate product 14 is transported to the ball mill crude ore bin becomes the ball mill raw ore; Intensity magnetic separator job trailer mineral products 12 become the true tailings product, send tailing dam to deposit.
Claims (3)
1. magnetic low-grade iron ore thing roller grinds strong magnetic wet type pre-selecting new technology a little less than one kind; It is characterized in that: raw ore ore process high pressure roller mill crusher machine final products granularity reaches 6～0mm content 80%, 3～0mm accounts for 60% level; The Wet-type strong magnetic separator preliminary election; Abandon the non magnetic ore of 20-30%, improve the selected grade of ball mill, specifically realize by the following step:
(1) granularity of producing from the stope digging less than the ore of 1000mm through the coarse crushing of ore dressing, fragmentation, fine crushing, screening operation, ore grain size is less than 35mm,
(2) granularity feeds high-pressure roller mill less than 35mm crushing operation product and carries out muck, and its ore grain size of producing is less than 15mm,
(3) the high-pressure roller mill product is given to the roller mill screening operation, and the sieve aperture of screening machine is 6mm, returns the high pressure roller mill machine operation greater than the oversize of 6mm and carries out brokenly again, and granularity feeds the low intensity magnetic separation operation less than the undersize of 6mm,
(4) the low intensity magnetic separation concentrate becomes preliminary election concentrate product, and the low intensity magnetic separation mine tailing gets into the high intensity magnetic separation operation,
(5) the high intensity magnetic separation concentrate becomes preliminary election concentrate product, and the high intensity magnetic separation mine tailing becomes final preliminary rejection,
(6) low intensity magnetic separation concentrate and high intensity magnetic separation concentrate are mixed and are delivered to ball mill to ore storage bin, become the ball mill raw ore, and the high intensity magnetic separation mine tailing becomes final ore dressing plant coarse fraction mine tailing.
2. weak magnetic low-grade iron ore thing roller according to claim 1 grinds strong magnetic wet type pre-selecting new technology, it is characterized in that granularity accounts for more than 80% less than 5mm in the undersize of described granularity less than 6mm, and granularity accounts for 59～61% less than 3mm.
3. weak magnetic low-grade iron ore thing roller according to claim 1 grinds strong magnetic wet type pre-selecting new technology, it is characterized in that described high intensity magnetic separation magnetic field intensity is 0.9～1.0T, stroke: 8～10mm.
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| CN113941433B (en) * | 2021-10-14 | 2023-07-28 | 中钢集团马鞍山矿山研究总院股份有限公司 | Ore dressing method for cascade recovery and segmented tailing discarding of low-grade chromite |
| CN114471945A (en) * | 2022-01-26 | 2022-05-13 | 中南大学 | Weak magnetic mineral separation process method |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Anshan Iron & Steel Group Mining Co., Ltd. |
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