CN107377204A - A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online - Google Patents
A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online Download PDFInfo
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- CN107377204A CN107377204A CN201710561770.7A CN201710561770A CN107377204A CN 107377204 A CN107377204 A CN 107377204A CN 201710561770 A CN201710561770 A CN 201710561770A CN 107377204 A CN107377204 A CN 107377204A
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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
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
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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
-
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Closed circuit shaft roasting dry grinding dry separation craft, its step are as follows online for a kind of refractory iron ore of the present invention：Right+15mm ~ 100mm oxidation refractory iron ore stone mills carry out magnetizing roast using shaft furnace, roasted ore is cooled to normal temperature, it is useless that dry type pre-selection throwing is carried out to roasted ore using magnetic pulley, throw useless rear roasted ore and carry out dry grinding dry separation, dry grind to 0.074mm accountings 70 80%, it is selected that three sections of dry types are carried out using flat board wind magnetic joint dry-dressing machine, two sections, three sections of mine tailings are after the enrichment of screw dry magnetic separator, it is enriched with mine tailing and one section of cleaner tailings, useless rear barren rock is thrown together to discharge by qualified tailings, Grade Control is below 10%, concentrate returns to newly-built granulation rotary kiln baking system and carries out closed circuit magnetizing roast after enrichment, three sections of selected rear concentrate are final qualified concentrate containing, grade reaches more than 60%.The technique is directed to the problem of size fractionated scope refractory iron ore shaft furnace magnetizing roast ore deposit magnetic tailing grade is high, realizes iron resource in online closed circuit recovery mine tailing, improves resource utilization.
Description
Technical field
The invention belongs to technical field of mineral processing, is related to a kind of closed circuit shaft roasting dry grinding dry separation online of refractory iron ore
Technique.
Background technology
China's iron ore resource lean ore is more, magnetic ore deposit is few, and weak-magnetic iron ore accounts for more than the 70% of gross reserves, weak magnetic
Iron ore is handled through magnetizing roast, after being changed into strongly magnetic mineral, can carry out magnetic separation, is obtained quality and is met sintered material requirement
Iron ore concentrate.+ 15mm ~ -100mm grades iron ore directly uses shaft furnace magnetizing roast, because refractory iron ore size fractionated has
There are different magnetizing roast characteristics, roasting time, sintering temperature are different, and certain limit grade iron ore enters shaft furnace Roasting
Burn, the problem of roasting quality is uneven unavoidably be present, that is, with the presence of rawore is burnt, cause tailings grade to be up to 15-25%, gold
It is only 75-80% or so to belong to the rate of recovery, and is sent into tailing dam using the filtered dehydration of wet-milling wet separation mine tailing, and secondary recovery utilizes
Complex process, cost are high.
The content of the invention
The present invention is directed to certain size fraction ranges refractory iron ore shaft furnace magnetizing roast, and roasted ore quality is uneven, magnetic separation tail
The problem of ore deposit grade is high, can recycle but be sent into tailing dam, and secondary recovery utilizes complex process, cost is high, there is provided one
Plant refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online.
The present invention adopts the following technical scheme that：A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online, tool
Body comprises the following steps：
Step A. carries out magnetizing roast using the right+15mm of shaft furnace ~ -100mm oxidation refractory iron ores, and roasted ore is cooled to normal temperature；
Step B. carries out dry type pre-selection throwing to roasted ore using magnetic pulley and given up, and throws useless Grade Control below 10%；
Step C. throws the pre- concentrate selection after giving up and enters dry grinding dry separation system dry grinding, -0.074mm accounting 70-80% is milled to, through flat board
Wind magnetic joint three sections of dry types of dry-dressing machine are selected, and three sections of selected rear concentrate are final qualified concentrate containing, and grade reaches more than 60%；
Dry-dressing machine is selected two sections for step D. flat board wind magnetic joint, three sections of mine tailings after the enrichment of screw dry magnetic separator, be enriched with mine tailing
Together discharged with one section of mine tailing, the useless rear barren rock of throwing by qualified tailings, Iron Grade of Tailings control is below 10%；
Concentrate returns to newly-built granulation rotary kiln magnetizing roast system and is calcined after step E. enrichments, and roasted ore enters former dry grind
Dry separation system, continue to participate in dry grinding, dry separation, form online closed circuit recycling.
Preferably ,+15mm ~ -100mm oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours, roasting
Burn 650 DEG C of temperature.
Preferably ,+15mm ~ -100mm oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours, roasting
Burn 650 DEG C of temperature.
Preferably, step D is enriched with the newly-built granulation rotary kiln baking system of concentrate return and is calcined, 650 DEG C of sintering temperature,
Roasting time 50min.
Preferably, one section of selected Oe of field strength 3000, two sections of selected Oe of field strength 2500, three sections of selected Oe of field strength 2200.
Because magnetic iron ore in continuous ore dressing, easily forms disk pack and wraps up in phenomenon, influence the selected index of dry type after roasting, this
Demagnetization device is installed additional before invention is selected at each section, and de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate, is next section of selected creation
Condition.
Oxidation refractory iron ore described in step A include speculum iron, bloodstone, limonite, siderite, any one, or
The Complex Iron Ore stone of above-mentioned any several iron ore symbiosis, belongs to weak-magnetic iron ore, need to after magnetizing roast can magnetic separation obtain
High grade iron concentrate.
Roasted ore after cooling described in step B, due to the country rock containing 10-15% in raw ore, using magnetic pulley to roasted ore
It is useless to carry out dry type pre-selection throwing, throws waste product position by adjusting revolution speed of screw control, throws and give up Grade Control below 10%, reduce follow-up
Ore grinding amount, reduce production cost.
Flat board wind magnetic joint dry-dressing machine described in step D is selected two sections, three sections of tails, because+15mm ~ -100mm oxidations difficulty selects iron
Ore enters stove and carries out magnetizing roast, and certain size fraction ranges miberal powder enters stove roasting and the problem of roasted ore quality is uneven be present unavoidably,
Cause two sections, three sections of tailings grades reach 15-25%, belong to unqualified mine tailing, the value for having recycling.Described two sections, three sections of tails
For ore deposit after screw dry magnetic separator enrichment processing, enrichment concentrate grade reaches 25-30%, and category burns pig iron ore, after palpus is fired
The qualified iron ore concentrate of energy magnetic separation production grade more than 60%, the newly-built granulation rotary kiln magnetizing roast system of concentrate return is entered after enrichment
Row roasting, roasted ore enter former dry grinding dry separation system, form online closed circuit recycling technique.
The beneficial effects of the invention are as follows：The present invention is according to the certain size fraction ranges iron ore shaft furnace magnetizing roast of refractory iron ore
Quality is uneven, causes tailings grade height, metal recovery rate low, and mine tailing, which has to recycle, is worth this feature, by magnetic separation not
Closed circuit recycling technique, metal recovery rate bring up to more than 85% to qualified tailings by 72% online, reduce wet-milling wet separation mine tailing
The cost that tailing dam recycles again is sent into, resource utilization is improved, has saved water resource, one is provided for water shortage mine
Bar handles the new way of refractory iron ore.
Brief description of the drawings
The process chart of Fig. 1 present invention.
Embodiment
The refractory iron ore that the present invention implements to use derives from wine steel Orebody in Jingtieshan ore deposit birch ditch mining area.
Embodiment 1
+ the 15mm of wine steel grade 32% ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore is subjected to following handle：The difficult choosing of Orebody in Jingtieshan
Iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnetic iron ore, and category difficulty selects weak-magnetic iron ore, and country rock is irony thousand
Piece rock, jasper etc..
A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online, specifically includes following steps：
Step A.+15mm ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours,
650 DEG C of sintering temperature, roasted ore are cooled to normal temperature, scaling loss 10%, roasted ore grade 35.56%；
Step B. roasted ore is carried out using screw dry magnetic separator dry type pre-selection throw it is useless, throw waste product position 7%, throw useless yield 10%,
Throw useless pre-selection concentrate grade 38.73%, throw useless pre-selection concentrate yield 90%.
The pre- concentrate selection that step C. throws after giving up is dry grinded to -0.074mm accountings 75%, is entered using flat board wind magnetic joint dry-dressing machine
Three sections of dry types of row are selected, and three sections of selected rear concentrate are final qualified concentrate containing.
70.65%, one section of one section of selected Oe of field strength 3000, concentrate grade 50.52%, concentrate yield concentrate gross production rate
63.59%th, 29.35%, one section of tailings grade 7.86%, mine tailing yield mine tailing gross production rate 26.42%；
Two sections of selected Oe of field strength 2500, concentrate grade 54.45%, concentrate yield 87.86%, two section of concentrate gross production rate 55.87%, tail
12.14%, two section of ore deposit grade 14.35%, mine tailing yield mine tailing gross production rate 7.72%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.11%, concentrate yield 90.65%, three section of concentrate gross production rate 50.45%, tail
9.21%, three section of ore deposit grade 25.8%, mine tailing yield mine tailing gross production rate 5.22%, the total metal recovery rate 86.24% of iron ore concentrate.
Bis- sections, three sections mine tailings of step D. merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after mine tailing
Grade 19.53%, yield 12.86%, enrichment concentrate grade 28.50, yield 54.61%, gross production rate 7.03%, enrichment tailings grade
9.60%th, yield 47.01%, gross production rate 5.84%.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 7.46%, gross production rate 44.86%.
Step E. enrichment concentrate return it is newly-built granulation rotary kiln baking system be calcined, 650 DEG C of sintering temperature, roasting when
Between 50min, cold-zone to normal temperature, return to former dry grinding dry separation system, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.55%, yield 49.71%, metal recovery rate 91.94%.
Embodiment 2
+ the 15mm of wine steel grade 34% ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore is subjected to following handle：The difficult choosing of Orebody in Jingtieshan
Iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnetic iron ore, and category difficulty selects weak-magnetic iron ore, and country rock is irony thousand
Piece rock, jasper etc..
A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online, specifically includes following steps：
Step A.+15mm ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours,
650 DEG C of sintering temperature, roasted ore are cooled to normal temperature, scaling loss 10%, roasted ore grade 37.78%；
Step B. carries out dry type pre-selection throwing to roasted ore using screw dry magnetic separator and given up, and throws waste product position 7.5%, throws useless yield
10%th, throw useless pre-selection concentrate grade 41.14%, throw useless pre-selection concentrate yield 90%.
The pre- concentrate selection that step C. throws after giving up is dry grinded to -0.074mm accountings 75%, is entered using flat board wind magnetic joint dry-dressing machine
Three sections of dry types of row are selected, and three sections of selected rear concentrate are final qualified concentrate containing.
75.32%, one section of one section of selected Oe of field strength 3000, concentrate grade 51.65%, concentrate yield concentrate gross production rate
67.79%th, 24.68%, one section of tailings grade 9.07%, mine tailing yield mine tailing gross production rate 22.21%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.32%, concentrate yield 91.26%, two section of concentrate gross production rate 61.86%, tail
8.74%, two section of ore deposit grade 13.33%, mine tailing yield mine tailing gross production rate 5.92%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.56%, concentrate yield 87.30%, three section of concentrate gross production rate 54.01%, tail
9.21%, three section of ore deposit grade 26.61%, mine tailing yield mine tailing gross production rate 5.70%, the total metal recovery rate 86.57% of iron ore concentrate.
Bis- sections, three sections mine tailings of step D. merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after mine tailing
Grade 18.49%, yield 11.62%, enrichment concentrate grade 28.56, yield 52.34%, gross production rate 6.08%, enrichment tailings grade
7.54%th, yield 47.01%, gross production rate 5.54%.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 7.13%, gross production rate 39.49%.
Step E. enrichment concentrate return it is newly-built granulation rotary kiln baking system be calcined, 650 DEG C of sintering temperature, roasting when
Between 50min, cold-zone to normal temperature, return to former dry grinding dry separation system, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.56%, yield 58.51%, metal recovery rate 91.11%.
Embodiment 3
+ the 15mm of wine steel grade 35% ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore is subjected to following handle：The difficult choosing of Orebody in Jingtieshan
Iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnetic iron ore, and category difficulty selects weak-magnetic iron ore, and country rock is irony thousand
Piece rock, jasper etc..
A kind of refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online, specifically includes following steps：
Step A.+15mm ~ -100mm Orebody in Jingtieshan oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours,
650 DEG C of sintering temperature, roasted ore are cooled to normal temperature, scaling loss 9.5%, roasted ore grade 38.46%；
Step B. carries out dry type pre-selection throwing to roasted ore using screw dry magnetic separator and given up, and throws waste product position 7.5%, throws useless yield
9.5%th, throw useless pre-selection concentrate grade 41.71%, throw useless pre-selection concentrate yield 90.5%.
The pre- concentrate selection that step C. throws after giving up is dry grinded to -0.074mm accountings 75%, is entered using flat board wind magnetic joint dry-dressing machine
Three sections of dry types of row are selected, and three sections of selected rear concentrate are final qualified concentrate containing.
76.21%, one section of one section of selected Oe of field strength 3000, concentrate grade 52.01%, concentrate yield concentrate gross production rate
68.97%th, 23.79%, one section of tailings grade 8.72%, mine tailing yield mine tailing gross production rate 21.53%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.46%, concentrate yield 90.58%, two section of concentrate gross production rate 62.47%, tail
9.42%, two section of ore deposit grade 18.84%, mine tailing yield mine tailing gross production rate 6.50%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.32%, concentrate yield 88.56%, three section of concentrate gross production rate 55.33%, tail
9.21%, three section of ore deposit grade 22.16%, mine tailing yield mine tailing gross production rate 5.75%, the total metal recovery rate 86.76% of iron ore concentrate.
Bis- sections, three sections mine tailings of step D. merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after mine tailing
Grade 20.04%, yield 12.25%, enrichment concentrate grade 28.59, yield 52.58%, gross production rate 6.44%, enrichment tailings grade
10.64%th, yield 47.01%, gross production rate 5.81%.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 8.71%, gross production rate 39.67%.
Step E. enrichment concentrate return it is newly-built granulation rotary kiln baking system be calcined, 650 DEG C of sintering temperature, roasting when
Between 50min, cold-zone to normal temperature, return to former dry grinding dry separation system, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.32%, yield 58.33%, metal recovery rate 91.47%.
Claims (6)
- A kind of 1. refractory iron ore closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that：Specifically include following steps：Step A. carries out magnetizing roast using the right+15mm of shaft furnace ~ -100mm oxidation refractory iron ores, and roasted ore is cooled to normal temperature；Step B. carries out dry type pre-selection throwing to roasted ore and given up, and throws useless Grade Control below 10%；Step C. throws the pre- concentrate selection after giving up and enters dry grinding dry separation system dry grinding, -0.074mm accounting 70-80% is milled to, through flat board Wind magnetic joint three sections of dry types of dry-dressing machine are selected, and three sections of selected rear concentrate are final qualified concentrate containing, and grade reaches more than 60%；Dry-dressing machine is selected two sections for step D. flat board wind magnetic joint, three sections of mine tailings after the enrichment of screw dry magnetic separator, be enriched with mine tailing Together discharged with one section of mine tailing, the useless rear barren rock of throwing by qualified tailings, Iron Grade of Tailings control is below 10%；Concentrate returns after enrichment Return newly-built granulation rotary kiln magnetizing roast system to be calcined, roasted ore into step C dry grinding dry separation system continue to dry grind, shape Into online closed circuit recycling.
- A kind of 2. refractory iron ore as claimed in claim 1 closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that： Refractory iron ore category weak-magnetic iron ore described in step A, including speculum iron, bloodstone, limonite, siderite or above-mentioned iron The symbiotic iron ore stone of ore deposit.
- A kind of 3. refractory iron ore as claimed in claim 1 closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that： In each section of selected preceding installation demagnetization device, de- magnetic treatment is carried out to previous stages of magnetic separation processing iron ore concentrate.
- A kind of 4. refractory iron ore as claimed in claim 1 closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that： + 15mm ~ -100mm oxidation refractory iron ore enters shaft furnace and carries out magnetizing roast, roasting time 9 hours, 650 DEG C of sintering temperature.
- A kind of 5. refractory iron ore as claimed in claim 1 closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that： Step D enrichment concentrate return to newly-built granulation rotary kiln baking system and are calcined, 650 DEG C of sintering temperature, roasting time 50min.
- A kind of 6. refractory iron ore as claimed in claim 1 closed circuit shaft roasting dry grinding dry separation craft online, it is characterised in that： One section of selected Oe of field strength 3000, two sections of selected Oe of field strength 2500, three sections of selected Oe of field strength 2200.
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Cited By (6)
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| CN108080142A (en) * | 2017-11-28 | 2018-05-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of shaft roasting ore deposit quality grading ore-dressing technique |
| CN108097448A (en) * | 2017-11-28 | 2018-06-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of shaft roasting ore deposit wet type quality grading ore-dressing technique |
| CN108531717A (en) * | 2018-04-19 | 2018-09-14 | 长沙矿冶研究院有限责任公司 | A method of Refractory red iron ores are handled based on graded combination magnetizing roast |
| CN108889439A (en) * | 2018-05-07 | 2018-11-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore roasted ore artificial magnet kind magnetization sorting process |
| CN110714117A (en) * | 2019-10-18 | 2020-01-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Intelligent pre-selection waste throwing-shaft furnace magnetizing roasting method for refractory iron ore |
| CN110747327A (en) * | 2019-11-13 | 2020-02-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-efficiency magnetizing roasting beneficiation method for refractory iron ore laminating crushing shaft furnace |
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| 崔建辉等: ""酒钢选矿工艺流程优化探讨"", 《矿冶工程》 * |
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| CN108080142A (en) * | 2017-11-28 | 2018-05-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of shaft roasting ore deposit quality grading ore-dressing technique |
| CN108097448A (en) * | 2017-11-28 | 2018-06-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of shaft roasting ore deposit wet type quality grading ore-dressing technique |
| CN108080142B (en) * | 2017-11-28 | 2019-09-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of shaft roasting mine quality grading ore-dressing technique |
| CN108531717A (en) * | 2018-04-19 | 2018-09-14 | 长沙矿冶研究院有限责任公司 | A method of Refractory red iron ores are handled based on graded combination magnetizing roast |
| CN108889439A (en) * | 2018-05-07 | 2018-11-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore roasted ore artificial magnet kind magnetization sorting process |
| CN110714117A (en) * | 2019-10-18 | 2020-01-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Intelligent pre-selection waste throwing-shaft furnace magnetizing roasting method for refractory iron ore |
| CN110747327A (en) * | 2019-11-13 | 2020-02-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-efficiency magnetizing roasting beneficiation method for refractory iron ore laminating crushing shaft furnace |
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