CN104785358B - Iron ore of low ore grade beneficiation method and device - Google Patents
Iron ore of low ore grade beneficiation method and device Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000000227 grinding Methods 0.000 claims abstract description 55
- 238000007885 magnetic separation Methods 0.000 claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 18
- 238000013467 fragmentation Methods 0.000 claims abstract description 3
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 3
- 239000006148 magnetic separator Substances 0.000 claims description 96
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 16
- 239000011707 mineral Substances 0.000 claims description 16
- 238000004064 recycling Methods 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 7
- 238000011084 recovery Methods 0.000 abstract description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241000707825 Argyrosomus regius Species 0.000 description 1
- 206010003694 Atrophy Diseases 0.000 description 1
- 230000037444 atrophy Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a kind of iron ore of low ore grade beneficiation method and device, belong to technical field of beneficiation.Iron ore of low ore grade beneficiation method of the present invention, comprises fragmentation, ore grinding and selected, and selected is adopt successively to put forward essence and fall slag magnetic separation and eluriate magnetic separation, obtains iron ore concentrate.Iron ore of low ore grade beneficiation method of the present invention, scientific and reasonable, operating cost is low, energy-conserving and environment-protective, ore dressing main economic and technical indices is made to reach advanced level, Iron concentrate grade reaches more than 65%, concentrate qualification rate reaches more than 95%, the full ferrous metal rate of recovery reaches more than 93%, and Armco magnetic iron metal recovery rate reaches more than 98%, has significant economic benefit; Present invention also offers that a kind of structure is simple, the iron ore of low ore grade ore-dressing plant of simple operation.
Description
Technical field
The present invention relates to a kind of iron ore of low ore grade beneficiation method and device, belong to technical field of beneficiation.
Background technology
Along with the keeping falling of international economy, domestic economy situation constantly adjust; China's steel market demand starts atrophy; country controls dynamics to iron and steel production capacity and continues to increase; and Ore Imported prices, domestic many barghs benefit obviously declines, and has reached the edge that meagre profit is even lost; environmental protection requirement is simultaneously also more and more tighter; for seeking enterprise development and the new road of existence, the Efforts To Develop innovation of domestic bargh is tended to act, and walks the road of promoting the mine with sci-tech.
In existing iron ore of low ore grade technique of preparing, broken employing three section is closed circuit, and ore grinding adopts the choosing of three-section closed circuit mill, the thick essence three of reverse flotation one sweeps technique.Ore dressing plant concentration process flow is mainly reverse floatation process flow process, and reverse floatation process is that aided processes such as having heating in addition, stir, make up a prescription, final filtration obtains concentrate by high frequency fine screen screenings through desliming magnetic separation, reverse flotation, reagent removal magnetic separation.Reverse floatation process is complicated, long flow path, and production auxiliary equipment is more, and need consume a large amount of medicament, production cost is higher, constrains the lifting of ore dressing economic benefit.Boiler needs to run to consume mass energy throughout the year, causes certain pollution to environment simultaneously.Therefore be badly in need of exploring new ore-dressing technique.
Summary of the invention
The object of this invention is to provide a kind of iron ore of low ore grade beneficiation method, it be scientific and reasonable, operating cost is low, energy-conserving and environment-protective, make ore dressing main economic and technical indices reach advanced level, there is significant economic benefit; Present invention also offers that a kind of structure is simple, the iron ore of low ore grade ore-dressing plant of simple operation.
Iron ore of low ore grade beneficiation method of the present invention, comprises fragmentation, ore grinding and selected, and selected is adopt successively to put forward essence and fall slag magnetic separation and eluriate magnetic separation, obtains iron ore concentrate, specifically comprises the following steps:
(1) tcrude ore is successively through jaw crusher, one-level dry type magnetic pulley, intermediate crusher and vibratory sieve, carries out in small, broken bits to vibratory sieve screenings, and oversize enters the deironing of secondary dry type magnetic pulley, and the middle mineral that deironing produces enter fine ore bin;
(2) the middle mineral in step (1) fine ore bin enter preliminary election magnetic separator, the mine tailing magneticly elected enters dewatering screen, the concentrate magneticly elected enters one section of grinding machine, one-level hydrocyclone, one-level magnetic separator and secondary hydrocyclone successively, mine tailing after secondary hydroclone classification enters Secondary grinding mill, concentrate after secondary hydroclone classification enters secondary magnetic separation machine and high frequency fine screen successively, high frequency fine screen screenings enters three grades of magnetic separators, and high frequency fine screen oversize enters level Four magnetic separator and three sections of grinding machines successively;
(3), in step (2), the concentrate after three grades of magnetic separator magnetic separation enters successively to be put forward essence and falls slag magnetic separator and elutriation magnetic separator carries out selected, obtains iron ore concentrate.
In described step (1), the mineral after in small, broken bits return vibratory sieve and sieve.The mine tailing that described one-level dry type magnetic pulley deironing produces is thick barren rock; The mine tailing that the deironing of secondary dry type magnetic pulley produces is thin barren rock.
In described step (2), the desilting after one-level hydroclone classification returns one section of grinding machine and carries out ore grinding; Mineral after Secondary grinding mill ore grinding return secondary hydrocyclone and carry out classification; Mineral after three sections of grinding machine ore grindings return high frequency fine screen and sieve.
In described step (2), dewatering screen, one-level magnetic separator, secondary magnetic separation machine, three grades of magnetic separators and the post-job mine tailing of level Four magnetic separator all enter recycling machine and reclaim.Wet thin barren rock is produced after described dewatering screen dehydration.
In described step (3), fall the mine tailing that slag magnetic separator and elutriation magnetic separator magnetic separation produce reclaim all again putting forward essence.Put forward the disposal ability that slag magnetic separator and elutriation magnetic separator two equipment fall in essence and all reach design treatment ability.
Propose the series connection use that slag magnetic separator and elutriation magnetic separator fall in essence, make new technology production application stable operation, creation data shows every mineral processing index and all reaches designing requirement, successively obtains valid data more than 600 altogether.Putting forward essence, to fall slag magnetic separator disposal ability be 40-50t/h, and the production capacity of wash mill is 28-30t/h, and indices reaches designing requirement.
Iron ore of low ore grade ore-dressing plant of the present invention, comprise disintegrating machine, dry type magnetic pulley, vibratory sieve, grinding machine, hydrocyclone and magnetic separator, jaw crusher is connected with preliminary election magnetic separator successively with one-level dry type magnetic pulley, intermediate crusher, vibratory sieve, secondary dry type magnetic pulley, fine ore bin, and vibratory sieve is also connected with fine crusher; Preliminary election magnetic separator is connected with high frequency fine screen with one section of grinding machine, one-level hydrocyclone, one-level magnetic separator, secondary hydrocyclone, secondary magnetic separation machine, and preliminary election magnetic separator is also connected with dewatering screen, and secondary hydrocyclone is also connected with Secondary grinding mill; High frequency fine screen is connected with level Four magnetic separator with three grades of magnetic separators respectively, and level Four magnetic separator is also connected with three sections of grinding machines; Three grades of magnetic separators with put forward essence and fall slag magnetic separator and be connected successively with elutriation magnetic separator.
Described fine crusher and vibratory sieve are linked to be closed-loop path by pipeline.
Described one-level hydrocyclone and one section of grinding machine are linked to be closed-loop path by pipeline; Secondary grinding mill and secondary hydrocyclone are linked to be closed-loop path by pipeline; Three sections of grinding machines and high frequency fine screen and level Four magnetic separator are linked to be closed-loop path by pipeline.
Described dewatering screen, one-level magnetic separator, secondary magnetic separation machine, three grades of magnetic separators are connected with recycling machine respectively with level Four magnetic separator, and recycling machine is connected with chats collector with concentration basin respectively.
Described essence of carrying is fallen between slag magnetic separator and elutriation magnetic separator and can also be provided with pump, when wash mill equipment is higher, discrepancy in elevation reason can not self-loopa time, completing to ore deposit pump of wash mill.
Iron ore of low ore grade beneficiation method of the present invention and device, make every technical-economic index all reach the requirement of production and operation, and leading indicator reaches or is better than current reverse flotation work index, and technique and device meet nation's security environmental protection policy.Be applied in actual ore-dressing practice, aspect plays a significant role to give the technique of preparing of enterprise, device level, economic benefit, cost reductions, environmental protection, save energy and reduce the cost etc.
Compared with prior art, the present invention has following beneficial effect:
(1) technological process is scientific and reasonable, and operating cost is low;
(2) ore dressing main economic and technical indices reaches test objective, Iron concentrate grade reaches more than 65%, and concentrate qualification rate reaches more than 95%, and the full ferrous metal rate of recovery reaches more than 93%, Armco magnetic iron metal recovery rate reaches more than 98%, and index level reaches advanced level;
(3) ore-dressing plant structure is simple, handled easily, puies forward the disposal ability that slag magnetic separator and elutriation magnetic separator two equipment fall in essence and all reaches design treatment ability.
Accompanying drawing explanation
Fig. 1 is iron ore of low ore grade ore-dressing plant structural representation;
In figure: 1, jaw crusher; 2, one-level dry type magnetic pulley; 3, intermediate crusher; 4, vibratory sieve; 5, secondary dry type magnetic pulley; 6, fine crusher; 7, fine ore bin; 8, preliminary election magnetic separator; 9, dewatering screen; 10, one section of grinding machine; 11, one-level hydrocyclone; 12, one-level magnetic separator; 13, secondary hydrocyclone; 14, secondary magnetic separation machine; 15, Secondary grinding mill; 16, high frequency fine screen; 17, three grades of magnetic separators; 18, level Four magnetic separator; 19, three sections of grinding machines; 20, recycling machine; 21, concentration basin; 22, chats collector; 23, put forward essence and fall slag magnetic separator; 24, elutriation magnetic separator.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further illustrated, but it does not limit enforcement of the present invention.
Embodiment 1
As shown in Figure 1, described iron ore of low ore grade ore-dressing plant, comprise disintegrating machine, dry type magnetic pulley, vibratory sieve 4, grinding machine, hydrocyclone and magnetic separator, jaw crusher 1 is connected with preliminary election magnetic separator 8 successively with one-level dry type magnetic pulley 2, intermediate crusher 3, vibratory sieve 4, secondary dry type magnetic pulley 5, fine ore bin 7, and vibratory sieve 4 is also connected with fine crusher 6; Preliminary election magnetic separator 8 is connected with high frequency fine screen 16 with one section of grinding machine 10, one-level hydrocyclone 11, one-level magnetic separator 12, secondary hydrocyclone 13, secondary magnetic separation machine 14, preliminary election magnetic separator 8 is also connected with dewatering screen 9, and secondary hydrocyclone 13 is also connected with Secondary grinding mill 15; High frequency fine screen 16 is connected with level Four magnetic separator 18 with three grades of magnetic separators 17 respectively, and level Four magnetic separator 18 is also connected with three sections of grinding machines 19; Three grades of magnetic separators 17 with put forward essence and fall slag magnetic separator 23 and be connected successively with elutriation magnetic separator 24.
Described fine crusher 6 is linked to be closed-loop path with vibratory sieve 4 by pipeline.
Described one-level hydrocyclone 11 and one section of grinding machine 10 are linked to be closed-loop path by pipeline; Secondary grinding mill 15 and secondary hydrocyclone 13 are linked to be closed-loop path by pipeline; Three sections of grinding machines 19 are linked to be closed-loop path with high frequency fine screen 16 and level Four magnetic separator 18 by pipeline.
Described dewatering screen 9, one-level magnetic separator 12, secondary magnetic separation machine 14, three grades of magnetic separators 17 are connected with recycling machine 20 respectively with level Four magnetic separator 18, and recycling machine 20 is connected with chats collector 22 with concentration basin 21 respectively.
Described iron ore of low ore grade beneficiation method, comprises the following steps:
(1) tcrude ore is successively through jaw crusher 1, one-level dry type magnetic pulley 2, intermediate crusher 3 and vibratory sieve 4, carries out in small, broken bits to vibratory sieve 4 screenings, and oversize enters the deironing of secondary dry type magnetic pulley 5, and the middle mineral that deironing produces enter fine ore bin 7; Mineral after in small, broken bits return vibratory sieve 4 and sieve.
(2) the middle mineral in step (1) fine ore bin 7 enter preliminary election magnetic separator 8, the mine tailing magneticly elected enters dewatering screen 9, the concentrate magneticly elected enters one section of grinding machine 10 successively, one-level hydrocyclone 11, one-level magnetic separator 12 and secondary hydrocyclone 13, mine tailing after secondary hydrocyclone 13 classification enters Secondary grinding mill 15, concentrate after secondary hydrocyclone 13 classification enters secondary magnetic separation machine 14 and high frequency fine screen 16 successively, high frequency fine screen 16 screenings enters three grades of magnetic separators 17, high frequency fine screen 16 oversize enters level Four magnetic separator 18 and three sections of grinding machines 19 successively, desilting after one-level hydrocyclone 11 classification returns one section of grinding machine 10 and carries out ore grinding, mineral after Secondary grinding mill 15 ore grinding return secondary hydrocyclone 13 and carry out classification, mineral after three sections of grinding machine 19 ore grindings return high frequency fine screen 16 and sieve, dewatering screen 9, one-level magnetic separator 12, secondary magnetic separation machine 14, three grades of magnetic separators 17 and the post-job mine tailing of level Four magnetic separator 18 all enter recycling machine 20 and reclaim.
(3), in step (2), the concentrate after the magnetic separation of three grades of magnetic separators 17 enters successively to be put forward essence and falls slag magnetic separator 23 and elutriation magnetic separator 24 carries out selected, obtains iron ore concentrate; Fall the mine tailing that slag magnetic separator 23 and elutriation magnetic separator 24 magnetic separation produce reclaim all again putting forward essence.
The mine tailing that described one-level dry type magnetic pulley 2 deironing produces is thick barren rock; The mine tailing that the deironing of secondary dry type magnetic pulley 5 produces is thin barren rock.
Wet thin barren rock is produced after described dewatering screen 9 dewaters.
For certain mineral company enrichment plant, after applying ore-dressing technique of the present invention and device, in economic benefit, novel technique transformation will produce comprehensive benefit 1396.07 ten thousand yuan the year after next; Under head grade the same terms, novel technique transformation will produce comprehensive benefit 893.09 ten thousand yuan (not calculating the profit because of concentrate grade difference aspect) year after next.
Claims (8)
1. an iron ore of low ore grade beneficiation method, comprises fragmentation, ore grinding and selected, it is characterized in that: selected employing is successively put forward essence and fallen slag magnetic separation and eluriate magnetic separation, and obtain iron ore concentrate, described iron ore of low ore grade beneficiation method specifically comprises the following steps:
(1) tcrude ore is successively through jaw crusher (1), one-level dry type magnetic pulley (2), intermediate crusher (3) and vibratory sieve (4), carry out in small, broken bits to vibratory sieve (4) screenings, oversize enters secondary dry type magnetic pulley (5) deironing, and the middle mineral that deironing produces enter fine ore bin (7);
(2) the middle mineral in step (1) fine ore bin (7) enter preliminary election magnetic separator (8), the mine tailing magneticly elected enters dewatering screen (9), the concentrate magneticly elected enters one section of grinding machine (10) successively, one-level hydrocyclone (11), one-level magnetic separator (12) and secondary hydrocyclone (13), mine tailing after secondary hydrocyclone (13) classification enters Secondary grinding mill (15), concentrate after secondary hydrocyclone (13) classification enters secondary magnetic separation machine (14) and high frequency fine screen (16) successively, high frequency fine screen (16) screenings enters three grades of magnetic separators (17), high frequency fine screen (16) oversize enters level Four magnetic separator (18) and three sections of grinding machines (19) successively,
(3), in step (2), the concentrate after the magnetic separation of three grades of magnetic separators (17) enters successively to be put forward essence and falls slag magnetic separator (23) and elutriation magnetic separator (24) carries out selected, obtains iron ore concentrate.
2. iron ore of low ore grade beneficiation method according to claim 1, is characterized in that: in step (2), and the desilting after one-level hydrocyclone (11) classification returns one section of grinding machine (10) and carries out ore grinding; Mineral after Secondary grinding mill (15) ore grinding return secondary hydrocyclone (13) and carry out classification; Mineral after three sections of grinding machine (19) ore grindings return high frequency fine screen (16) and sieve.
3. iron ore of low ore grade beneficiation method according to claim 1, it is characterized in that: in step (2), dewatering screen (9), one-level magnetic separator (12), secondary magnetic separation machine (14), three grades of magnetic separators (17) and level Four magnetic separator (18) post-job mine tailing all enter recycling machine (20) and reclaim.
4. iron ore of low ore grade beneficiation method according to claim 1, is characterized in that: in step (3), falls the mine tailing that slag magnetic separator (23) and elutriation magnetic separator (24) magnetic separation produce reclaim all again putting forward essence.
5. the device that the arbitrary described iron ore of low ore grade beneficiation method of claim 1-4 is used, comprise disintegrating machine, dry type magnetic pulley, vibratory sieve (4), grinding machine, hydrocyclone and magnetic separator, it is characterized in that: jaw crusher (1) is connected with preliminary election magnetic separator (8) successively with one-level dry type magnetic pulley (2), intermediate crusher (3), vibratory sieve (4), secondary dry type magnetic pulley (5), fine ore bin (7), and vibratory sieve (4) is also connected with fine crusher (6); Preliminary election magnetic separator (8) is connected with high frequency fine screen (16) with one section of grinding machine (10), one-level hydrocyclone (11), one-level magnetic separator (12), secondary hydrocyclone (13), secondary magnetic separation machine (14), preliminary election magnetic separator (8) is also connected with dewatering screen (9), and secondary hydrocyclone (13) is also connected with Secondary grinding mill (15); High frequency fine screen (16) is connected with level Four magnetic separator (18) with three grades of magnetic separators (17) respectively, and level Four magnetic separator (18) is also connected with three sections of grinding machines (19); Three grades of magnetic separators (17) with put forward essence and fall slag magnetic separator (23) and be connected successively with elutriation magnetic separator (24).
6. the device that iron ore of low ore grade beneficiation method according to claim 5 is used, is characterized in that: fine crusher (6) and vibratory sieve (4) are linked to be closed-loop path by pipeline.
7. the device that iron ore of low ore grade beneficiation method according to claim 5 is used, is characterized in that: one-level hydrocyclone (11) and one section of grinding machine (10) are linked to be closed-loop path by pipeline; Secondary grinding mill (15) and secondary hydrocyclone (13) are linked to be closed-loop path by pipeline; Three sections of grinding machines (19) are linked to be closed-loop path with high frequency fine screen (16) and level Four magnetic separator (18) by pipeline.
8. the device that iron ore of low ore grade beneficiation method according to claim 5 is used, it is characterized in that: dewatering screen (9), one-level magnetic separator (12), secondary magnetic separation machine (14), three grades of magnetic separators (17) are connected with recycling machine (20) respectively with level Four magnetic separator (18), and recycling machine (20) is connected with chats collector (22) with concentration basin (21) respectively.
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| CN106179718A (en) * | 2016-08-02 | 2016-12-07 | 山东华联矿业股份有限公司 | Dressing of middles technique |
| CN106345606B (en) * | 2016-08-26 | 2018-10-23 | 中冶北方（大连）工程技术有限公司 | A method of improving magnetite separation factory's ore dressing quality and production capacity |
| CN106362859A (en) * | 2016-11-24 | 2017-02-01 | 江苏省冶金设计院有限公司 | System and method for preparing low-sulfur iron powder |
| CN108393191A (en) * | 2018-04-25 | 2018-08-14 | 马钢(集团)控股有限公司 | A kind of novel magnetic iron ore sorting process |
| CN113117880A (en) * | 2021-04-08 | 2021-07-16 | 河北钢铁集团矿业有限公司 | Beneficiation process and beneficiation system for high-vanadium titano-magnetite |
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| US5443157A (en) * | 1994-03-31 | 1995-08-22 | Nimco Shredding Co. | Automobile shredder residue (ASR) separation and recycling system |
| CN101322956B (en) * | 2007-06-15 | 2011-05-25 | 淄博市华联矿业有限责任公司 | Method for selecting magnetic mine |
| CN103785528B (en) * | 2014-01-25 | 2016-05-11 | 山东华特磁电科技股份有限公司 | Put forward essence and fall slag magnetic separator |
| CN103769295B (en) * | 2014-02-18 | 2015-10-28 | 黄学顺 | A kind of ore-dressing technique of low-grade marble type magnetic iron ore |
| KR101445849B1 (en) * | 2014-04-18 | 2014-09-29 | 한국광물자원공사 | Wet process selecting apparatus using magnetism |
| CN104384018B (en) * | 2014-12-09 | 2017-04-12 | 北矿机电科技有限责任公司 | External magnetic barrel type magnetic separator for coarse particle mineral separation |
| CN204544408U (en) * | 2015-04-03 | 2015-08-12 | 山东华联矿业股份有限公司 | Iron ore of low ore grade ore-dressing plant |
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Denomination of invention: Beneficiation method and device of low-grade iron ore Effective date of registration: 20221209 Granted publication date: 20151111 Pledgee: Yiyuan Bo merchant village bank Limited by Share Ltd. Pledgor: SHANDONG HUALIAN MINING Co.,Ltd. Registration number: Y2022980026460 |