CN107377206A - A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing - Google Patents
A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing Download PDFInfo
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- CN107377206A CN107377206A CN201710562812.9A CN201710562812A CN107377206A CN 107377206 A CN107377206 A CN 107377206A CN 201710562812 A CN201710562812 A CN 201710562812A CN 107377206 A CN107377206 A CN 107377206A
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- iron ore
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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
-
- 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
-
- 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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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention proposes a kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing, step：1mm granulations are classified as to 15mm oxidation refractory iron ores using rotary kiln, + 1 ~ 5mm, + 5 ~ 15mm scopes carry out magnetizing roast respectively, roasted ore is cooled to normal temperature, it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, throw useless rear roasted ore and carry out wet-milling wet separation, it is selected that three sections of wet types are carried out using weak magnetic separator, two sections, three sections of mine tailings are after magnetic separator is enriched with, 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 8%, the filtered dehydration of concentrate after enrichment, break up, granulation returns to rotary kiln and carries out closed circuit magnetizing roast, three sections of selected rear concentrate are final qualified concentrate containing, grade reaches more than 60%.The technique pin realizes iron resource in online closed circuit recovery mine tailing, avoids feeding Tailings Dam secondary recovery from hanking the problem of this is high again.
Description
Technical field
The invention belongs to iron ore dressing technical field, is related to a kind of closed circuit recovery of rotary kiln baking magnetic separation iron ore stone mine tailing
Utilize 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 grades iron ore directly uses shaft furnace magnetizing roast, and -15mm grade iron ores are classified as -1mm granulations ,+1
~ -5mm ,+5 ~ -15mm enter rotary kiln and carry out magnetizing roast respectively, because difficulty selects ferric oxide ore size fractionated to have different magnetization
Baking property, roasting time, sintering temperature are different, and certain limit grade iron ore enters rotary kiln magnetizing roast, deposits unavoidably
Roasting quality is uneven the problem of, that is, with the presence of rawore is burnt, tailings grade is caused to be up to 17 ~ 22%, metal recovery rate is only
For 78% or so, and tailing dam is sent into the filtered dehydration of mine tailing, and secondary recovery is using needing to spend very big cost.
The content of the invention
The present invention is directed to certain size fraction ranges refractory iron ore rotary kiln magnetizing roast, and roasted ore quality is uneven, magnetic separation
A kind of the problem of tailings grade is high, can recycle but be sent into tailing dam, and secondary recovery utilizes cost high, there is provided rotary kiln
The closed circuit recycling technique of calcining magnetic separation iron ore tailings.
The technical solution adopted in the present invention is：A kind of closed circuit recycling work of rotary kiln baking magnetic separation iron ore stone mine tailing
Skill, comprise the following steps：A. magnetizing roast is carried out to refractory iron ore using rotary kiln, roasted ore is cooled to normal temperature；
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, throws useless Grade Control below 8%；
C. throw it is useless after pre- concentrate selection successively by one section, two sections, three sections of weak magnetic wet grindings it is selected, be milled to -0.074mm and account for
Than 70% or so, ore deposit is final qualified concentrate containing after the mill choosing of weak magnetic wet type, and grade reaches more than 60%；
D. two sections of weak magnetics are selected, three sections of weak magnetic essence mine tailings after magnetic separator is enriched with, mine tailing and one section of cleaner tailings after enrichment, throw it is useless
Barren rock is together discharged by qualified tailings afterwards, and Iron Grade of Tailings is controlled below 8%；
E. the filtered dehydration of concentrate after being enriched with, drying is broken up, pelletize returns to the closed circuit magnetizing roast of rotary kiln progress, magnetic separation；
F. because for magnetic iron ore in continuous ore dressing, easily formation disk pack wraps up in phenomenon, influences the selected index of wet type, needs after roasting
At each section it is selected before install demagnetization device additional, de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate, selected created conditions for next section.
Oxidation refractory iron ore described in step A includes speculum iron, bloodstone, limonite, siderite and complicated symbiosis
Iron ore, belong to weak-magnetic iron ore, need to after magnetizing roast can magnetic separation obtain high grade iron concentrate.
Refractory iron ore is crushed to -15mm, is then classified as -1mm ,+1 ~ -5mm ,+5 ~ -15mm, -1mm granulation, three
Size fraction ranges enter kiln and carry out magnetizing roast respectively.Magnetizing roast respectively, certain size fraction ranges enter kiln roasting and roasted ore be present unavoidably
The problem of quality is uneven, causes bis- sections, three sections tailings grades of step C to reach 17 ~ 20%, belong to unqualified mine tailing, there is recycling
Value.
Roasted ore in step B, due to containing 10% or so country rock in raw ore, using screw dry magnetic separator 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 8%, reduce follow-up mill
Ore deposit amount, reduce production cost.
Step D, bis- sections of weak magnetic cleaner tailings of E, three sections of weak magnetic cleaner tailings are enriched with concentrate after intensity magnetic separator enrichment processing
Grade reaches 30% or so, and category burns pig iron ore, and the qualified iron ore concentrate of ability magnetic separation production grade more than 60%, rich after palpus is fired
After the filtered dehydration of collection concentrate, drying are broken up, pelletize, return to rotary kiln and enter calcining magnetic separation process system, formation is closed circuit online
Tailings recovery process.
The beneficial effects of the invention are as follows：According to the certain size fraction ranges iron ore rotary kiln magnetizing roast quality of refractory iron ore
It is uneven, cause tailings grade height, metal recovery rate low, mine tailing, which has to recycle, is worth this feature, develops magnetic separation not
Qualified tailings closed circuit recycling technique online, reduce mine tailing and be sent into the cost that tailing dam recycles again, improve money
Source utilization rate.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Embodiment
The oxidation refractory iron ore that embodiment uses derives from wine steel Orebody in Jingtieshan ore deposit.
- 15mm Orebody in Jingtieshan oxidation the refractory iron ore of wine steel grade 32% is subjected to following handle：
A. be classified as -1mm and pelletize ,+1 ~ -5mm ,+5 ~ -15mm enter kiln and carry out magnetizing roast respectively, roasted ore is cooled to often
Temperature；
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, throws waste product position below 8%；Due to containing in raw ore
There is 10% or so country rock, carry out dry type pre-selection throwing to roasted ore using screw dry magnetic separator and give up, by adjusting revolution speed of screw control
Waste product position is thrown, useless Grade Control is thrown below 8%, reduces follow-up ore grinding amount, reduce production cost.
C. throw it is useless after pre- concentrate selection by three sections of weak magnetic wet types mill choosings, be milled to -0.074mm accountings 70% or so, three sections
Concentrate is final qualified concentrate containing after selected, and grade reaches more than 60%；
D. the selected one section of tailings grade of weak magnetic is discharged below 8% by qualified tailings, two sections, three sections of tailings grades 17%, through high intensity magnetic separation
After machine enrichment, tailings grade 10% is enriched with, is together discharged with one section of mine tailing, the useless rear barren rock of throwing by qualified tailings, total Iron Grade of Tailings
Control is enriched with concentrate grade 30% below 9%, and filtered dehydration, drying are broken up, pelletized, and return to rotary kiln closed circuit recovery online
Magnetizing roast, magnetic separation, it is final to obtain iron concentrate grade 60%, the index of metal recovery rate 88%.
Claims (3)
1. a kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing, comprises the following steps：A. rotary kiln is used
Magnetizing roast is carried out to refractory iron ore, roasted ore is cooled to normal temperature；
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, throws useless Grade Control below 8%；
C. throw it is useless after pre- concentrate selection successively by one section, two sections, three sections of weak magnetic wet grindings it is selected, be milled to -0.074mm and account for
Than 70% or so, ore deposit is final qualified concentrate containing after the mill choosing of weak magnetic wet type, and grade reaches more than 60%；
D. two sections of weak magnetics are selected, three sections of weak magnetic essence mine tailings after magnetic separator is enriched with, mine tailing and one section of cleaner tailings after enrichment, throw it is useless
Barren rock is together discharged by qualified tailings afterwards, and Iron Grade of Tailings is controlled below 8%；
E. the filtered dehydration of concentrate after being enriched with, drying is broken up, pelletize returns to the closed circuit magnetizing roast of rotary kiln progress, magnetic separation；
F. because for magnetic iron ore in continuous ore dressing, easily formation disk pack wraps up in phenomenon, influences the selected index of wet type, needs after roasting
At each section it is selected before install demagnetization device additional, de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate, selected created conditions for next section.
2. the closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing according to claim 1, it is characterized in that：Step
Oxidation refractory iron ore described in rapid A includes speculum iron, bloodstone, limonite, siderite and complicated symbiotic iron ore stone.
3. the closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing according to claim 1, it is characterized in that：It is difficult
Iron ore is crushed to -15mm, is then classified as -1mm ,+1 ~ -5mm ,+5 ~ -15mm, -1mm granulation, three size fraction ranges point
Do not enter kiln and carry out magnetizing roast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710562812.9A CN107377206A (en) | 2017-07-11 | 2017-07-11 | A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710562812.9A CN107377206A (en) | 2017-07-11 | 2017-07-11 | A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing |
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| CN201710562812.9A Pending CN107377206A (en) | 2017-07-11 | 2017-07-11 | A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950179A (en) * | 2018-06-15 | 2018-12-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore low temperature reduction with hydrogen magnetic roasting 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 |
| CN110787905A (en) * | 2019-10-18 | 2020-02-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Magnetized roasting-intelligent pre-selection combined discarding method for weakly magnetic refractory iron ore |
| CN113789422A (en) * | 2021-11-17 | 2021-12-14 | 唐山冀东装备工程股份有限公司 | Tailing resource utilization method and system |
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| CN104437826A (en) * | 2014-09-15 | 2015-03-25 | 中冶北方（大连）工程技术有限公司 | Separation technology of specularite after reduction roasting |
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| CN102728457A (en) * | 2012-06-15 | 2012-10-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method of producing nickel-containing iron ore concentrate from siliceous iron oxide ores containing nickel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950179A (en) * | 2018-06-15 | 2018-12-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore low temperature reduction with hydrogen magnetic roasting process |
| CN108950179B (en) * | 2018-06-15 | 2020-07-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Low-temperature hydrogen reduction magnetizing roasting process for refractory iron ore |
| 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 |
| CN110787905A (en) * | 2019-10-18 | 2020-02-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Magnetized roasting-intelligent pre-selection combined discarding method for weakly magnetic refractory iron ore |
| CN113789422A (en) * | 2021-11-17 | 2021-12-14 | 唐山冀东装备工程股份有限公司 | Tailing resource utilization method and system |
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Application publication date: 20171124 |
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