CN107185686A - A kind of ferric oxide ore combined mineral dressing technology - Google Patents
A kind of ferric oxide ore combined mineral dressing technology Download PDFInfo
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- CN107185686A CN107185686A CN201710288960.6A CN201710288960A CN107185686A CN 107185686 A CN107185686 A CN 107185686A CN 201710288960 A CN201710288960 A CN 201710288960A CN 107185686 A CN107185686 A CN 107185686A
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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
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
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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
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
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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
- B03C1/02—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
- C22B1/10—Roasting processes in fluidised form
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- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of ferric oxide ore combined mineral dressing technology, comprise the following steps：（1）Ferric oxide ore dry separation throws useless, obtains pre-selection coarse fraction ore, pre-selection fine fraction ore and barren rock；（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feed high-pressure roller mill and crushed；（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into row dry type closed circuit grinding；（4）Fluidized reduction is calcined：A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；B. preheat；C. heat；D. magnetizing roast；E. less than 200 DEG C are cooled to, the roasted ore that magnet mineral content is more than 90% is obtained；（5）Roasted ore ore dressing, it is 57% 65% iron extract mine producations to obtain grade, and the present invention can effectively solve the problem that the technical problems such as low resource utilization present in existing ferric oxide ore ore-dressing technique, concentrate poor quality, energy consumption height.
Description
Technical field
The present invention relates to iron oxide mineral processing technology field, more particularly to a kind of ferric oxide ore combined mineral dressing technology.
Background technology
China's iron ore resource rich reserves, more than 60,000,000,000 tons, prediction does not find out resource more than 100,000,000,000 tons, in addition
The recent available iron ore deposit about 20,000,000,000 of also a considerable amount of low-grade iron ore resources, wherein large medium-size mine depth edge
Ton.Although China's iron ore resource enriches, availability is not high, less than 35%, mostly oxide ore, and account for gross reserves 65% is left
The right side, and ferric oxide ore utilize at present typically using following technique carry out ore dressing：One is raw ore-ore grinding-high intensity magnetic separation, big absolutely
Partial oxidation iron ore dressing factory uses the principle process, such as wine steel, Baogang, Anshan iron and steel plant East Anshan ore dressing plant and great quantity of small ore dressing
Factory etc., two be raw ore-ore grinding-high intensity magnetic separation-flotation, and such as Anshan iron and steel plant part ore dressing plant is further raising concentrate grade.
Above-mentioned existing ferric oxide ore ore-dressing technique shortcoming：One is that concentrate Iron grade is low, and impurity content is high, such as wine steel concentrate
Grade is only 46% or so, SiO2Content 12% or so；Two be that iron recovery is low, and most of between 60%-80%, the wasting of resources is tight
Weight；Three be that production cost is high, and process efficiency is low, and concentrate output is few.
The content of the invention
The concentrate Iron grade that the present invention exists for existing ore-dressing technique is low, and impurity content is high, and iron recovery is low, resource
Waste serious, production cost is high, process efficiency is low, there is provided a kind of dry separation of efficient, low energy consumption for the few technical problem of concentrate output
Throw tail dry milling fluidized reduction roasting combined mineral dressing technology.
To achieve these goals, technical scheme is specific as follows：
A kind of ferric oxide ore combined mineral dressing technology, comprises the following steps：
（1）Ferric oxide ore dry separation is thrown useless：The ferric oxide ore of extraction is crushed to granularity less than 30mm, sieve for 30-5mm it is thick
Grade and less than two products of 5mm fine fractions, respectively enter dry type strong magnetic separator of the magnetic field intensity more than 0.8T to by country rock and
The barren rock of horsestone composition carries out dry separation throwing and removed, and pre-selection coarse fraction ore, pre-selection fine fraction ore and barren rock are obtained respectively；
（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feed high-pressure roller mill and crushed, broken
Granularity is broken to less than 8mm；
（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into the closed circuit mill of row dry type
Ore deposit, obtains the ore milling product that granularity is less than the grain size content 30%-80% of 200 mesh；
（4）Fluidized reduction is calcined：
A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；
B. preheated in 200-250 DEG C of air-flow；
C. ore milling product is heated in heating furnace, 800-900 DEG C of heating-up temperature；
D. enter reduction furnace and carry out magnetizing roast, 520-530 DEG C of reduction temperature；
E. the roasted ore after reducing is cooled to less than 200 DEG C in the state of isolation air, obtains magnet mineral content and is more than
90% roasted ore；
（5）Roasted ore ore dressing：
A. to step（4）In obtained roasted ore carry out wet grinding, obtain the grain size content 80%- that granularity is less than 300 mesh
93.2% ore milling product；
B. obtained ore milling product is fed into magnetic separator, three sections of progress is selected, obtains magnetic product and non-magnetic product；
C. magnetic product is fed into flotation device, carries out flotation, obtain grade for 57%-65% iron extract mine producations.
Wherein, the step（1）In dry type strong magnetic separator be magnetic field intensity 0.8-1.1T, roller linear velocity 1.2-
1.8m/s drum-type intensity magnetic separator.
Wherein, the step (2) in, pre-selection coarse fraction ore enters high-pressure roller mill and carries out closed circuit or open circuit crushing.
Wherein, the step (3) in, in ore milling product granularity exceed 1.0mm bulky grain screen out after return and regrind.
Wherein, the step (4) in, the reducing agent used is coal gas.
Wherein, the coal gas is blast furnace gas or coal gas.
Wherein, the CO contents of the blast furnace gas are 25%, and the CO contents of coal gas are 37%-43%.
Wherein, the step (5) in, the magnetic field intensity of magnetic separator is 0.15-0.18T
Wherein, the step (5) in, flotation be direct flotation or reverse flotation.
The beneficial effects of the invention are as follows：
1. a process can be thrown except barren rocks such as country rock, horsestones early, the expenses such as transport, ore grinding are reduced；
2. the dry-milled product in the present invention can directly enter fluidized bed furnace reduction roasting, filtering and drying link are reduced, further
Reduce cost and energy consumption；
3. step（4）Magnetic separation-flotation again after fluidized reduction roasting reduction, can effectively improve concentrate grade and the rate of recovery, essence
Ore deposit grade can reach 57%-65%, and the rate of recovery reaches more than 80%, such as wine steel ore, using present invention process, concentrate grade
13 percentage points are improved, the rate of recovery improves 20 percentage points, and index advantage is extremely obvious；
4. pass through step（1）After ferric oxide ore dry separation throwing is useless, rock is spilled over, and does not enter back into grinding process, reduces mill
Ore deposit cost, improves efficiency；
5. high pressure roller mill product makes ore become easy mill, ore grinding energy consumption is reduced；
6. oxidized iron ore with weak magnetism thing is mutually changed into ferromagnetism magnetic iron ore, more easily choosing, concentrate grade and the rate of recovery are in pairs significantly
Improve, resource utilization is high；
7. it is applicable to ore and waste residue of all mineral containing weak magnetism etc..
8. step（1）Ferric oxide ore dry separation throws useless, and country rock, horsestone and the low product being mixed into except object for mining are thrown in its dry separation
Position intergrowth ore, it is pre- to throw useless purpose, the grade of ore is improved, subsequent job treating capacity is reduced.
9. step（2）High pressure roller mill is crushed, and can further improve reduction ratio, and ore is become prone to ore grinding, is equal
Even ore grinding and reduction energy consumption create conditions.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Embodiment
Embodiment 1
By taking ore dressing of certain domestic Iron grade for 34% iron oxide ore as an example.
Using a kind of ferric oxide ore combined mineral dressing technology of the invention as shown in Figure 1, its processing step is as follows：
（1）Ferric oxide ore dry separation is thrown useless：The ferric oxide ore of extraction is crushed to granularity less than 30mm, sieve for 30-5mm it is thick
Grade and less than two products of 5mm fine fractions, respectively enters magnetic field intensity 1.1T, roller linear velocity 1.2m/s dry high-magnetic separation
Machine carries out dry separation throwing to the barren rock being made up of country rock and horsestone and removed, and pre-selection coarse fraction ore, pre-selection fine fraction ore are obtained respectively
And barren rock；
（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feed high-pressure roller mill carry out it is closed circuit broken
It is broken, granularity is crushed to less than 8mm；
（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into the closed circuit mill of row dry type
Bulky grain of the granularity more than 1.0mm is returned after screening out and regrinded in ore deposit, ore milling product, obtains the grain size content that granularity is less than 200 mesh
30% ore milling product；
（4）Fluidized reduction is calcined：
A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；
B. preheated in 250 DEG C of air-flow；
C. ore milling product is heated in heating furnace, 900 DEG C of heating-up temperature；
D. enter reduction furnace and carry out magnetizing roast, 530 DEG C of reduction temperature, reducing agent is CO contents 43% in coal gas, coal gas；
E. the roasted ore after reducing is cooled to less than 200 DEG C in the state of isolation air, obtains magnet mineral content and is more than
90% roasted ore；
（5）Roasted ore ore dressing：
A. to step（4）In obtained roasted ore carry out wet grinding, obtain the mill that granularity is less than the grain size content 90% of 300 mesh
Mineral products；
B., obtained ore milling product is fed to magnetic field intensity 0.18T magnetic separator, three sections of progress is selected, obtains magnetic product and non-
Magnetic product；
C. magnetic product is fed into flotation device, carries out reverse flotation, reject siliceous gangue mineral, obtained grade and produced for 65% iron ore concentrate
Product.
Embodiment 2
By taking ore dressing of certain domestic Iron grade for 31% iron oxide ore as an example.
Using a kind of ferric oxide ore combined mineral dressing technology of the invention as shown in Figure 1, its processing step is as follows：
（1）Ferric oxide ore dry separation is thrown useless：The ferric oxide ore of extraction is crushed to granularity less than 30mm, sieve for 30-5mm it is thick
Grade and less than two products of 5mm fine fractions, respectively enters magnetic field intensity 0.9T, roller linear velocity 1.5m/s dry high-magnetic separation
Machine carries out dry separation throwing to the barren rock being made up of country rock and horsestone and removed, and pre-selection coarse fraction ore, pre-selection fine fraction ore are obtained respectively
And barren rock；
（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feeding high-pressure roller mill, to carry out open circuit broken
It is broken, granularity is crushed to less than 8mm；
（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into the closed circuit mill of row dry type
Bulky grain of the granularity more than 1.0mm is returned after screening out and regrinded in ore deposit, ore milling product, obtains the grain size content that granularity is less than 200 mesh
80% ore milling product；
（4）Fluidized reduction is calcined：
A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；
B. preheated in 200 DEG C of air-flow；
C. ore milling product is heated in heating furnace, 850 DEG C of heating-up temperature；
D. enter reduction furnace and carry out magnetizing roast, 520 DEG C of reduction temperature, reducing agent is CO contents 37% in coal gas, coal gas；
E. the roasted ore after reducing is cooled to less than 200 DEG C in the state of isolation air, obtains magnet mineral content and is more than
90% roasted ore；
（5）Roasted ore ore dressing：
A. to step（4）In obtained roasted ore carry out wet grinding, obtain the grain size content 93.2% that granularity is less than 300 mesh
Ore milling product；
B., obtained ore milling product is fed to magnetic field intensity 0.18T magnetic separator, three sections of progress is selected, obtains magnetic product and non-
Magnetic product；
C. magnetic product is fed into flotation device, carries out reverse flotation, reject siliceous gangue mineral, obtain grade for 60.59% iron ore concentrate
Product.
Embodiment 3
By taking ore dressing of certain domestic Iron grade for 30-48% iron oxide ore as an example.
Using a kind of ferric oxide ore combined mineral dressing technology of the invention as shown in Figure 1, its processing step is as follows：
（1）Ferric oxide ore dry separation is thrown useless：The ferric oxide ore of extraction is crushed to granularity less than 30mm, sieve for 30-5mm it is thick
Grade and less than two products of 5mm fine fractions, respectively enters magnetic field intensity 0.8T, roller linear velocity 1.8m/s dry high-magnetic separation
Machine carries out dry separation throwing to the barren rock being made up of country rock and horsestone and removed, and pre-selection coarse fraction ore, pre-selection fine fraction ore are obtained respectively
And barren rock；
（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feed high-pressure roller mill carry out it is closed circuit broken
It is broken, granularity is crushed to less than 8mm；
（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into the closed circuit mill of row dry type
Bulky grain of the granularity more than 1.0mm is returned after screening out and regrinded in ore deposit, ore milling product, obtains the grain size content that granularity is less than 200 mesh
56% ore milling product；
（4）Fluidized reduction is calcined：
A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；
B. preheated in 240 DEG C of air-flow；
C. ore milling product is heated in heating furnace, 800 DEG C of heating-up temperature；
D. enter reduction furnace and carry out magnetizing roast, 525 DEG C of reduction temperature, reducing agent is CO contents in blast furnace gas, blast furnace gas
25%；
E. the roasted ore after reducing is cooled to less than 180 DEG C in the state of isolation air, obtains magnet mineral content and is more than
90% roasted ore；
（5）Roasted ore ore dressing：
A. to step（4）In obtained roasted ore carry out wet grinding, obtain the mill that granularity is less than the grain size content 80% of 200 mesh
Mineral products；
B., obtained ore milling product is fed to magnetic field intensity 0.15T magnetic separator, three sections of progress is selected, obtains magnetic product and non-
Magnetic product；
C. magnetic product is fed into flotation device, carries out direct flotation, obtain grade for 64.5% iron extract mine producation.
Claims (9)
1. a kind of ferric oxide ore combined mineral dressing technology, it is characterised in that comprise the following steps：
（1）Ferric oxide ore dry separation is thrown useless：The ferric oxide ore of extraction is crushed to granularity less than 30mm, sieve for 30-5mm it is thick
Grade and less than two products of 5mm fine fractions, respectively enter dry type strong magnetic separator of the magnetic field intensity more than 0.8T to by country rock and
The barren rock of horsestone composition carries out dry separation throwing and removed, and pre-selection coarse fraction ore, pre-selection fine fraction ore and barren rock are obtained respectively；
（2）High pressure roller mill is crushed：By step（1）In obtained pre-selection coarse fraction ore, feed high-pressure roller mill and crushed, broken
Granularity is broken to less than 8mm；
（3）Dry milling：By step (2) middle crushed product and step (1) it is middle pre-selection fine fraction ore be merged into the closed circuit mill of row dry type
Ore deposit, obtains the ore milling product that granularity is less than the grain size content 30%-80% of 200 mesh；
（4）Fluidized reduction is calcined：
A. by step, (3) gained ore milling product is fed in fluidized reduction roaster；
B. preheated in 200-250 DEG C of air-flow；
C. ore milling product is heated in heating furnace, 800-900 DEG C of heating-up temperature；
D. enter reduction furnace and carry out magnetizing roast, 520-530 DEG C of reduction temperature；
E. the roasted ore after reducing is cooled to less than 200 DEG C in the state of isolation air, obtains magnet mineral content and is more than
90% roasted ore；
（5）Roasted ore ore dressing：
A. to step（4）In obtained roasted ore carry out wet grinding, obtain the grain size content 80%- that granularity is less than 300 mesh
93.2% ore milling product；
B. obtained ore milling product is fed into magnetic separator, three sections of progress is selected, obtains magnetic product and non-magnetic product；
C. magnetic product is fed into flotation device, carries out flotation, obtain grade for 57%-65% iron extract mine producations.
2. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step（1）In
Dry type strong magnetic separator be magnetic field intensity 0.8-1.1T, roller linear velocity 1.2-1.8m/s drum-type intensity magnetic separator.
3. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step (2) in,
Preselect coarse fraction ore and enter the closed circuit or open circuit crushing of high-pressure roller mill progress.
4. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step (3) in,
Bulky grain of the granularity more than 1.0mm is returned after screening out and regrinded in ore milling product.
5. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step (4) in,
The reducing agent used is coal gas.
6. a kind of ferric oxide ore combined mineral dressing technology according to claim 5, it is characterised in that：The coal gas is blast furnace
Coal gas or coal gas.
7. a kind of ferric oxide ore combined mineral dressing technology according to claim 6, it is characterised in that：The blast furnace gas
CO contents are 25%, and the CO contents of coal gas are 37%-43%.
8. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step (5) in,
The magnetic field intensity of magnetic separator is 0.15-0.18T.
9. a kind of ferric oxide ore combined mineral dressing technology according to claim 1, it is characterised in that：The step (5) in,
Flotation is direct flotation or reverse flotation.
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| CN110694789A (en) * | 2019-11-18 | 2020-01-17 | 安徽马钢矿业资源集团有限公司 | Ore dressing method for magnetite |
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| CN109550589A (en) * | 2018-10-29 | 2019-04-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasting beneficiation method |
| CN109482322A (en) * | 2018-11-21 | 2019-03-19 | 衡阳县天宇陶瓷矿业有限公司 | A kind of poor quality feldspar ore processing method and its feldspar fine powder |
| CN113286658A (en) * | 2018-11-27 | 2021-08-20 | 福特斯丘金属集团 | Apparatus and method for treating iron ore |
| CN110773317A (en) * | 2019-10-18 | 2020-02-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Combined pre-selection waste-throwing process for complex symbiotic 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 |
| CN110773316A (en) * | 2019-10-18 | 2020-02-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Combined pre-selection waste-throwing process for weak-magnetism refractory iron ore |
| CN110694789A (en) * | 2019-11-18 | 2020-01-17 | 安徽马钢矿业资源集团有限公司 | Ore dressing method for magnetite |
| CN113042200A (en) * | 2021-03-30 | 2021-06-29 | 酒泉钢铁(集团)有限责任公司 | Grading and pre-selecting process for low-grade refractory iron oxide ore |
| CN112844716A (en) * | 2021-04-19 | 2021-05-28 | 中国恩菲工程技术有限公司 | Low-grade iron ore pretreatment process |
| CN113843050A (en) * | 2021-10-11 | 2021-12-28 | 内蒙古宏鉮科技发展有限责任公司 | Iron ore dressing method for bayan obo iron-containing surrounding rock |
| CN113843050B (en) * | 2021-10-11 | 2023-02-28 | 内蒙古宏鉮科技发展有限责任公司 | Iron ore dressing method for bayan obo iron-containing surrounding rock |
| CN114160304A (en) * | 2021-12-02 | 2022-03-11 | 华筑绿建(北京)科技有限公司 | Raw ore iron removal process |
| CN114178046A (en) * | 2021-12-03 | 2022-03-15 | 中国地质科学院郑州矿产综合利用研究所 | Beneficiation method for pyrochlore |
| CN114178046B (en) * | 2021-12-03 | 2023-09-22 | 中国地质科学院郑州矿产综合利用研究所 | Beneficiation method for pyrochlore |
| CN115382662A (en) * | 2022-10-28 | 2022-11-25 | 铜源国际工程设计研究有限公司 | Waste-free comprehensive utilization process and system for ultra-lean magnetite resources |
| CN115382662B (en) * | 2022-10-28 | 2023-01-10 | 铜源国际工程设计研究有限公司 | Waste-free comprehensive utilization process and system for ultra-lean magnetite resources |
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