CN109550589A - A kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasting beneficiation method - Google Patents
A kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasting beneficiation method Download PDFInfo
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- CN109550589A CN109550589A CN201811271131.8A CN201811271131A CN109550589A CN 109550589 A CN109550589 A CN 109550589A CN 201811271131 A CN201811271131 A CN 201811271131A CN 109550589 A CN109550589 A CN 109550589A
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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
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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
- B03C1/01—Pretreatment specially adapted for magnetic separation by addition of magnetic adjuvants
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Abstract
The invention discloses a kind of refractory iron ore lamination crushing rotary kiln fast-magnetics to roast beneficiation method, belongs to mineral manufacture field, and it is at high cost to solve the problems, such as that the length of magnetizing roast time existing for existing method processing -15mm refractory iron ore, kiln body ring formation, mill select.The present invention is the following steps are included: A, using high-pressure roller mill extremely -5mm and broken up -15mm refractory iron ore lamination crushing；B, reducing agent is added, wholegrain grade magnetizing roast is directly carried out to -5mm the refractory iron ore that step A is obtained using rotary kiln, roasted ore is cooled to 40-50 DEG C after roasting；C, it carries out dry type pre-selection throwing to give up, the roasted ore after throwing is useless carries out dry grinding dry separation or wet-milling wet separation.Present invention reduces -15mm refractory iron ore rotary kiln magnetizing roast the time, maturing temperature is reduced, rotary kiln magnetizing roast kiln body ring formation is avoided, improves iron concentrate grade and metal recovery rate.
Description
Technical field
The invention belongs to mineral manufacture fields, and in particular to a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasting
Burn beneficiation method.
Background technique
Iron ore resource lean ore more, magnetic mine in China's is few, and weak-magnetic iron ore accounts for about 70% of gross reserves or more, weak magnetic
Iron ore is handled through magnetizing roast, after becoming strongly magnetic mineral, can carry out magnetic separation, is obtained quality and is met sintered material requirement
Iron ore concentrate.+ 15mm grade refractory iron ore can directly adopt shaft furnace magnetizing roast, can also be through jaw crusher or cone crusher
Magnetizing roast is carried out using rotary kiln after crusher machine.And -15mm grade refractory iron ore is limited by poor air permeability, cannot be used
Shaft furnace magnetizing roast processing.- 15mm grade mainly uses high intensity magnetic separation process to be handled at present, and iron concentrate grade is only 45-
47%, metal recovery rate is only 65-67%, there is a problem of that iron concentrate grade is low, metal recovery rate is low.Big Xigou ditch, Shaanxi and Xinjiang
Atushi carries out -15mm grade refractory iron ore using rotary kiln is reentered after jaw crusher or cone crushing
There is kiln body ring formation in the mode of magnetizing roast, rotary kiln, restrict normal production, reduction maturing temperature is forced, to prolong
Calcining time has been grown, refractory iron ore processing cost is increased, and has been only capable of obtaining iron concentrate grade 56-58%, metal recovery rate
The index of 75-80%, results in waste of resources.
Summary of the invention
The object of the present invention is to provide a kind of refractory iron ore lamination crushing rotary kiln fast-magnetics to roast beneficiation method, with
It solves magnetizing roast time length existing for existing method processing -15mm refractory iron ore, kiln body ring formation, mill and selects at high cost ask
Topic.
The technical scheme is that a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasts beneficiation method,
The following steps are included:
A, it by -15mm refractory iron ore lamination crushing to -5mm and is broken up using high-pressure roller mill；
B, reducing agent is added, wholegrain grade magnetizing roast is directly carried out to -5mm the refractory iron ore that step A is obtained using rotary kiln,
Roasted ore is cooled to 40-50 DEG C after roasting；
C, it carries out dry type pre-selection throwing to give up, the roasted ore after throwing is useless carries out dry grinding dry separation or wet-milling wet separation.
As a further improvement of the present invention, in stepb, reducing agent is coal dust.
As a further improvement of the present invention, in stepb, the mass ratio of coal dust and -5mm refractory iron ore is 1-2:
100。
As a further improvement of the present invention, in stepb, maturing temperature is 650-700 DEG C.
As a further improvement of the present invention, in stepb, calcining time 30-45min.
As a further improvement of the present invention, refractory iron ore includes speculum iron, bloodstone, limonite, siderite or multiple
Miscellaneous symbiotic iron ore stone.These iron ore category weak-magnetic iron ores, need to after magnetizing roast can magnetic separation obtain high grade iron essence
Mine.
High-pressure roller mill broken material is not that breaking for individual particle is done on crusher working face or between other crushing mediums
Broken or grinding, but crush ore as a bed of material, which forms under high pressure, and pressure causes particle to squeeze it
Its adjacent particles cracks or splits broken until its major part is broken, fracture, i.e. ore is when by immense pressure, particle
The distance between it is increasingly closer, until starting to transmit stress each other, when stress is greater than the maximum that particle can bear
When pressure, crushing takes place in ore particles.High-pressure roller mill lamination crushing can not only be such that ore is effectively crushed, and
And can make to generate a large amount of crackles inside particle, it mainly include transgranular crackle, intercrystalline crack and transcrystalline cracking, these crackles are extensive
It is present in each ore particles, to achieve the effect that make iron ore particle " reduction ", makes the gas permeability and grindability of ore
It improves, is conducive to magnetizing roast gas overflowing and infiltration, the good permeability of ore can shorten the magnetizing roast time, reduce Roasting
Burn temperature.Compared with jaw crusher or cone crushing ore magnetizing roast parameter, calcining time is dropped by 60-90min
To 30-45min, maturing temperature is reduced to 650-700 DEG C by 750-800 DEG C, after maturing temperature reduces, while solving rotary kiln
Wholegrain grade enters the problem of kiln kiln body ring formation, has achieved the purpose that fast-magnetic roasts.
Refractory iron ore generates running crack and is split on ore internal mineral interface after high-pressure roller mill lamination crushing
Seam thereby reduces the intensity of ore and improves mineral disaggregation characteristic, roasts with jaw crusher or cone crushing
Mine is compared, and roasted ore ball milling work index can reduce 9-16% under the grinding fineness that -0.074mm accounts for 75%-80%, is had clearly
Energy-saving effect, iron concentrate grade improves by 56-58% to 60% or more, and metal recovery rate is improved by 75-80% to 90% or more.
The beneficial effects of the present invention are:
1. the present invention by the method for lamination crushing, makes to form a large amount of transgranular crackles, intercrystalline crack inside refractory iron ore particle
And transcrystalline cracking, be conducive to magnetizing roast gas overflowing and infiltration, so as to shorten -15mm refractory iron ore rotary kiln Roasting
It burns the time, reduce maturing temperature, improve resource utilization, promote and apply rotary kiln magnetizing roast for domestic refractory iron ore
Technology creates condition；
2. having achieved the purpose that fast-magnetic roasts the invention avoids rotary kiln magnetizing roast kiln body ring formation；
3. the index that the present invention obtains 60% or more iron concentrate grade, 90% or more metal recovery rate；
4. using present invention processing refractory iron ore, rotary kiln magnetizing roast production capacity improves 40-50%, and energy consumption reduces 20-30%,
The effect for having obviously energy conservation, reducing cost.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The following examples can further illustrate the present invention, but the invention is not limited in any way.Following implementation
The refractory iron ore that example uses derives from wine steel Orebody in Jingtieshan mine, and high-pressure roller mill is existing equipment.
Embodiment 1 handles the -15mm Orebody in Jingtieshan refractory iron ore of grade 32% according to the following steps:
A. it using high-pressure roller mill lamination crushing to -5mm, and breaks up；
B. quickly wholegrain grade magnetization directly carrying out low-temperature short-time to the -5mm refractory iron ore that step A is obtained using rotary kiln
The mass ratio of roasting, reducing agent coal dust and -5mm refractory iron ore is 1:100, calcining time 30min, maturing temperature 650
DEG C, roasted ore is cooled to 40 DEG C after roasting；
C. dry type pre-selection is carried out to roasted ore and throws useless, dry grinding dry separation processing, obtain iron concentrate grade 60%, metal recovery rate 90%
Index.
With Orebody in Jingtieshan speculum iron magnetizing roast after jaw crusher used by the prior art or cone crushing, dry
Mill dry separation index compare, the rotary kiln magnetizing roast time by 60min be down to 30min, maturing temperature by 750 DEG C be reduced to 650 DEG C,
Iron concentrate grade is improved to 60%, metal recovery rate by 58% and is increased to 90% by 75%.Overall measuring and calculating, in the present embodiment, revolution
Kiln magnetizing roast production capacity improves 40%, and energy consumption reduces by 20%.
Embodiment 2 handles the -15mm Orebody in Jingtieshan refractory iron ore of grade 33% according to the following steps:
A. it using high-pressure roller mill lamination crushing to -5mm, and breaks up；
B. quickly wholegrain grade magnetization directly carrying out low-temperature short-time to the -5mm refractory iron ore that step A is obtained using rotary kiln
The mass ratio of roasting, reducing agent coal dust and -5mm refractory iron ore is 2:100, calcining time 45min, maturing temperature 700
DEG C, roasted ore is cooled to 50 DEG C after roasting；
C. dry type pre-selection is carried out to roasted ore and throws useless, wet-milling wet separation processing, obtain iron concentrate grade 61%, metal recovery rate 92%
Index.
With Orebody in Jingtieshan speculum iron magnetizing roast after jaw crusher used by the prior art or cone crushing, dry
Mill dry separation index compare, the rotary kiln magnetizing roast time by 90min be down to 45min, maturing temperature by 800 DEG C be reduced to 700 DEG C,
Iron concentrate grade is improved to 61%, metal recovery rate by 56% and is increased to 92% by 80%.Overall measuring and calculating, using the process spiegel
Mountain iron ore, rotary kiln magnetizing roast production capacity improve 50%, and energy consumption reduces by 30%.
Claims (6)
1. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasts beneficiation method, it is characterised in that including following step
It is rapid:
A, it by -15mm refractory iron ore lamination crushing to -5mm and is broken up using high-pressure roller mill；
B, reducing agent is added, wholegrain grade magnetizing roast is directly carried out to -5mm the refractory iron ore that step A is obtained using rotary kiln,
Roasted ore is cooled to 40-50 DEG C after roasting；
C, it carries out dry type pre-selection throwing to give up, the roasted ore after throwing is useless carries out dry grinding dry separation or wet-milling wet separation.
2. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic according to claim 1 roasts beneficiation method,
Be characterized in that: in stepb, the reducing agent is coal dust.
3. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic according to claim 2 roasts beneficiation method,
Be characterized in that: in stepb, the mass ratio of the coal dust and -5mm refractory iron ore is 1-2:100.
4. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic according to claim 3 roasts beneficiation method,
Be characterized in that: in stepb, maturing temperature is 650-700 DEG C.
5. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic according to claim 4 roasts beneficiation method,
It is characterized in that: in stepb, calcining time 30-45min.
6. a kind of refractory iron ore lamination crushing rotary kiln fast-magnetic roasting choosing according to any one of claims 1-5
Mine method, it is characterised in that: the refractory iron ore includes speculum iron, bloodstone, limonite, siderite or complicated symbiotic iron ore
Stone.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110735030A (en) * | 2019-10-18 | 2020-01-31 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Magnetic pulse pretreatment high-efficiency magnetizing roasting process for refractory iron ores |
| 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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| 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 |
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| 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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