CN107119185A - A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore - Google Patents
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore Download PDFInfo
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- CN107119185A CN107119185A CN201710289159.3A CN201710289159A CN107119185A CN 107119185 A CN107119185 A CN 107119185A CN 201710289159 A CN201710289159 A CN 201710289159A CN 107119185 A CN107119185 A CN 107119185A
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- iron ore
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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
Abstract
The present invention relates to a kind of magnetizing roast method that complicated difficult selects mixed type iron ore.It is according to the mineral composition of mixed type iron ore, by the way of the high mixed type iron ore of sparring mineral content and sparring mineral content be low or mixed type iron ore of without siderite carries out resultant magnetization roasting by a certain percentage, weak magnetism mineral among mixed type iron ore are converted into ferromagnetism iron mineral, roasted ore is that can obtain Iron grade and the higher iron ore concentrate of iron recovery index by conventional weak magnetic separation process.The magnetizing roast method is applicable to the coal base reduction technique such as tunnel cave, rotary kiln, and during magnetic roasting process, can be unworthy of in roasting object or be incorporated reducing agent less, so as to reduce roasting technique energy consumption.
Description
Technical field
The invention belongs to mineral processing, metallurgical technology field, specifically a kind of complicated difficult selects the magnetization of mixed type iron ore
Method of roasting.
Background technology
China's iron ore rich ore is few, lean ore is more, and 97% iron ore is less than 30% low-grade iron ore, and the country is remained
Mixed type iron ore is selected in the complicated difficult not being exploited largely.
Since 2l centuries are entered, iron ore resource demand is faced with China's steel industry in situation is gradually increasing
Huge pressure, therefore, develops China's complicated difficult and selects mixed type iron ore, and the development to supporting China's steel industry is supported
Imperial world's iron ore market risk, is of great immediate significance and far-reaching historic significance.
At present, China's complicated difficult selects mixed type iron ore mainly to have following three kinds of disposal options：
1st, only the ferromagnetism iron mineral among mixed type iron ore is recycled, the mixed type iron ore after exploitation is advanced
Row is broken, dry type pre-selection, and the mixed type iron ore after pre-selection based on magnetic iron ore enters ore grinding-weak magnetic separation process and returned
Receive and utilize, with siderite, red after pre-selection（It is brown）Mixed type iron ore based on iron ore is stored up as barren rock, causes iron ore resource
Waste, and take a large amount of soils.Such as wine steel Orebody in Jingtieshan periphery mine, finds out that iron ore resource amount amounts to 2688.7 ten thousand tons,
Eight ore bodies are had, are the different typical hybrid sections ore of mineral composition, it is supporting to select factory by above-mentioned technological design, cause mill
Ore particle degree is in -400 mesh content 95%, and magnetic concentrate grade is 57% or so, and iron recovery can be only achieved 44 ~ 50%, and choosing ratio is up to
4.02 again.
2nd, the ferromagnetism iron mineral among mixed type iron ore is recycled with weak magnetic separation process, then again to dry
The Tailings utilization high intensity magnetic separation process that the barren rock or wet type weak magnetic separation process that formula weak magnetic separation process is dished out are dished out reclaims iron ore concentrate.In the presence of
Subject matter：（1）Barren rock or mine tailing that weak magnetic separation process is dished out it is main with siderite, it is red（It is brown）Based on iron ore, it is than magnetization
Coefficient is small, and the iron concentrate grade after magnetic separation is low, metal recovery rate is low；（2）Mill selects complex process, and the low intensity magnetic separation stage needs multistage to break
Broken, ore grinding, magnetic separation, the high intensity magnetic separation stage are also required to multistage grinding, magnetic separation.
3rd, carry out magnetizing roast direct to mixed type iron ore.The subject matter of presence：（1）Based on siderite, contain
Because reducing atmosphere is strong after the mixed type iron ore roasting of the iron minerals such as limonite, magnetic iron ore, bloodstone, cause itself to contain
Magnetic iron ore（Ferroso-ferric oxide）It is difficult to recycle after crossing reduction, generation FeO, influences after magnetic separation index, and roasting in flue gas
CO concentration is high, both the energy is caused to waste, and pollute environment；（2）Without siderite, the weak magnetic such as limonite, bloodstone
Property iron mineral content summation exceed reducing agent after the mixed type iron ore roasting of the ferromagnetism iron mineral content such as magnetic iron ore and consume
Amount is big, and roasting cost is high.
The content of the invention
It is an object of the invention to provide a kind of magnetizing roast method that complicated difficult selects mixed type iron ore, according to mixing sections
The mineral composition of ore, by the high mixed type iron ore of sparring mineral content and sparring mineral content be low or mixed type without siderite
Iron ore carries out resultant magnetization roasting by a certain percentage, to solve mixed type iron ore magnetic dressing process complexity, magnetic separation index error, roasting
Burn the problem of magnetic separation cost is high.
In order to realize the purpose of the present invention, the present invention is adopted the following technical scheme that：
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, specific as follows：According to the mineral group of mixed type iron ore
Into the high mixed type iron ore of sparring mineral content and sparring mineral content is low or mixed type iron ore without siderite is by certain
Ratio carries out resultant magnetization roasting.
The high mixed type iron ore of described sparring mineral content and sparring mineral content be low or mixing sections without siderite
Ore in mass ratio 30 ~ 60：40 ~ 70 mixing magnetizing roasts.
The roasting granularity of described mixed type iron ore raw material is 0 ~ 30mm.
Magnetizing roast method firing stage is using the rotary kiln dynamic roasting for ensuring reducing atmosphere or uses box resistance
Stove static state roasting.During resultant magnetization roasting chamber type electric resistance furnace, by the way of layer-by-layer distribution is calcined, i.e. sparring mineral content is high
Mixed type iron ore cloth is in roasting pot lower floor, and the low mixed type iron ore cloth of sparring mineral content is on roasting pot upper strata, wherein lower floor
It is unworthy of reducing agent, reducing agent is matched somebody with somebody on a small quantity or is unworthy of on upper strata；During resultant magnetization roasting rotary kiln, using enter after mixing kiln roasting
Mode, the i.e. high mixed type iron ore of sparring mineral content and the low mixed type iron ore of sparring mineral content are reentered after mixing in proportion
Kiln is calcined, and is unworthy of or with a small amount of reducing agent in blending process.
The mode of iron ore layer-by-layer distribution roasting among above-mentioned chamber type electric resistance furnace roasting pot can be multilayer.
When the present invention uses chamber type electric resistance furnace simulation tunnel kiln magnetic roasting process, comprise the following steps：
（1）Mixed type iron ore by siderite weight/mass percentage composition 20 ~ 40%（Weight of iron content in mixed type iron ore
It is for 25 ~ 40%：TFe25~40%）Mixed type iron ore with sparring mineral content 0 ~ 10%（Weight of iron in mixed type iron ore
Content is：TFe25~40%）0 ~ 30mm is crushed to respectively；
（2）The high mixed type iron ore of sparring mineral content is layered on roasting pot lower floor, sparring mineral content is low or without siderite
Mixed type iron ore is layered on roasting pot upper strata, and lower floor's iron ore is 30 ~ 60 than scope with upper strata iron ore weight：40 ~ 70, then
One layer of capping charcoal protection is spread in the roasting pot the superiors；
（3）Enter the mixed material after stove magnetizing roast and be cooled to room temperature, ore grinding-weak then is carried out to the mixed material after cooling
Magnetic separation, finally gives the magnet fine mineral powder of high-quality, while output magnetic tailing.
When the present invention uses chamber type electric resistance furnace simulation tunnel kiln magnetic roasting process, the mode of iron ore layer-by-layer distribution roasting
It can be multilayer.
The present invention is applied to rotary kiln magnetic roasting process, comprises the following steps：
（1）Mixed type iron ore by sparring mineral content 20 ~ 40%（Weight of iron content in mixed type iron ore is 25 ~ 40%
I.e.：TFe25~40%）Mixed type iron ore with sparring mineral content 0 ~ 10%（Weight of iron content in mixed type iron ore is 25
~ 40% is：TFe25~40%）0 ~ 30mm is crushed to respectively；
（2）The high mixed type iron ore of sparring mineral content and sparring mineral content is low or mixed type iron ore of without siderite is pressed
Certain proportion is mixed, and the weight before mixing is 30 ~ 60 than scope：40~70；
（3）Enter the mixed material after kiln magnetizing roast and be cooled to room temperature, ore grinding-weak then is carried out to the mixed material after cooling
Magnetic separation, finally gives the magnet fine mineral powder of high-quality, while output magnetic tailing.
The present invention main chemical reactions formula be：
mFe2O3·nH2O= mFe2O3+nH2O （1）
（Limonite is thermally decomposed, m=1-4, n=1-3, and 15min can deviate from the 80% of total crystallization water at 240 ~ 400 DEG C）
3FeCO3→Fe3O4+CO+2CO2（2）
（Siderite is thermally decomposed, and significant reaction is carried out at 392 DEG C）
3Fe2O3+CO=2Fe3O4+CO2 （3）
（Fe2O3Reduction reaction）
The present invention is applied to tunnel cave magnetic roasting process principle, and according to the characteristics of heat transfer of tunnel cave, kiln car upper strata iron ore is most
First it is heated, and material temperature highest, after a small amount of siderite of upper strata mixed type iron ore, limonite are thermally decomposed, lower floor's sparring mineral content
High mixed type iron ore starts to be thermally decomposed, and itself is being converted to ferromagnetism Fe3O4While, the CO of output to lower floor and
Fe among the iron ore of upper strata2O3Reduced, be converted to ferromagnetism Fe3O4, while effectively controlling the reproducibility gas among the bed of material
Atmosphere, makes the Fe among iron ore3O4With newborn Fe3O4FeO will not be reduced into.
The present invention is applied to rotary kiln magnetic roasting process principle, by sparring mineral content high mixed type iron ore and sparring
After mineral content is low or mixed type iron ore of without siderite mixes by a certain percentage, high mixed of sparring mineral content in roasting process
Mould assembly iron ore starts to be thermally decomposed, and itself is being converted to ferromagnetism Fe3O4While, the CO of output works as to bed of material iron ore
Middle Fe2O3Reduced, be converted to ferromagnetism Fe3O4, while effectively controlling the reducing atmosphere among the bed of material, make iron ore
Central Fe3O4With newborn Fe3O4FeO will not be reduced into.
Iron ore Task-size Controlling is by the present invention the reason for 0 ~ 30mm, appropriate to reduce iron ore granularity, can accelerate it also
Former speed, and iron ore siderite, the limonite decomposition rate of big granularity are less than small grain size, select 0 ~ 30mm granularity model
Enclosing also can effectively control bed of material reducing atmosphere.
Beneficial effects of the present invention are：
（1）The present invention is solved after the high mixed type iron ore magnetizing roast of sparring mineral content because reducing atmosphere is strong, causes it
The magnetic iron ore itself contained（Fe3O4）Spend the problem of being difficult to recycle after reduction, generation FeO；
（2）It is calcined by using resultant magnetization, sparring mineral content is low or mixed type iron ore without siderite is in magnetizing roast
When can be unworthy of or less match somebody with somebody reducing agent, so as to reduce magnetizing roast cost；
（3）The high mixed type iron ore of sparring mineral content and sparring mineral content is low or mixed type iron ore of without siderite is pressed
After the roasting of certain proportion resultant magnetization, the reducing atmosphere among the bed of material can be effectively controlled, the content of CO in discharged gas fume is reduced,
Effects of energy saving and emission reduction is obvious；
（4）Present invention process flow is simple, it is easy to promote, solve mixed type iron ore magnetic dressing process complexity, magnetic separation index error,
The problem of calcining magnetic separation cost is high.
Brief description of the drawings
Fig. 1 are the tunnel cave process charts of magnetizing roast method of the present invention；
Fig. 2 are the rotary kiln technology flow charts of magnetizing roast method of the present invention.
Embodiment
Mixed type iron ore of the present invention mainly includes following several：（1）Based on siderite, containing limonite,
The mixed type iron ore of the iron minerals such as magnetic iron ore, bloodstone；（2）With red（It is brown）Based on iron ore, contain the iron such as magnetic iron ore, siderite
The mixed type iron ore of mineral；（3）Based on magnetic iron ore, containing the weak magnetism mineral content such as siderite, limonite, bloodstone
Summation exceedes the mixed type iron ore of the ferromagnetism iron mineral contents such as magnetic iron ore；（4）Without siderite, limonite, bloodstone etc.
The summation of weak magnetism mineral content exceedes the mixed type iron ore of the ferromagnetism iron mineral contents such as magnetic iron ore.
The brief description of the drawings and beneficial effect to the present invention are further described in detail below in conjunction with the accompanying drawings.
Embodiment 1
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, comprises the following steps：
Step one：Respectively by certain mineOre body sparring mineral content 20%, full Iron grade 33.71%, and VIII ore body sparring mineral content
5%th, the mixed type iron ore of full Iron grade 32.48% is crushed to 20mm；
Step 2：Weigh 20mmOre body iron ore 200g is laid on roasting pot lower floor, weighs the ore body iron ore 200g of 20mm VIII pavings
In roasting pot upper strata, VIII ore body iron ore stone surface covers 20g semi-cokes again；
Step 3：It is 850 DEG C to control box resistance furnace temperature, begins place into roasting, roasting time 50min；
Step 4：After roasting terminates, water seal is cooled to normal temperature after roasting pot is taken out；
Step 5：Mixed material after cooling is by broken, ore grinding, and grinding particle size controls -200 mesh contents to be 90%, then by magnetic
Pipe is selected to be sorted, the Oe of magnetic separation field strength 1250 obtains iron ore concentrate.
Iron ore concentrate is sampled and leading indicator detection, iron concentrate grade is that 55.46%, iron recovery is after detection
82.44%。
Embodiment 2
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, comprises the following steps：
Step one：Respectively by certain mineOre body sparring mineral content 20%, full Iron grade 33.71%, and VIII ore body sparring mineral content
5%th, the mixed type iron ore of full Iron grade 32.48% is crushed to 30mm；
Step 2：Weigh 30mmThe ore body iron ore 500g of ore body iron ore 500g and 30mm VIII, then mixes two kinds of iron ores
It is even；
Step 3：750 DEG C of kiln temperature of rotary kiln baking section, rotating speed 90s/r, filling rate 25%, high temperature section roasting time 20min are controlled,
Start to be calcined into kiln；
Step 4：After roasted ore fully enters rotary kiln cooling section, power-off cooling, cooling section seals discharging after air cooling；
Step 5：Mixed material after cooling is by broken, ore grinding, and grinding particle size controls -200 mesh contents to be 85%, then by magnetic
Pipe is selected to be sorted, the Oe of magnetic separation field strength 1250 obtains iron ore concentrate.
Iron ore concentrate is sampled and leading indicator detection, iron concentrate grade is that 56.03%, iron recovery is after detection
82.85%。
Claims (8)
1. a kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, it is characterised in that：According to the ore deposit of mixed type iron ore
Thing is constituted, and the high mixed type iron ore of sparring mineral content and sparring mineral content is low or mixed type iron ore of without siderite is pressed
Certain proportion carries out resultant magnetization roasting.
2. a kind of complicated difficult according to claim 1 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：Water chestnut
The high mixed type iron ore of iron ore content and sparring mineral content be low or mixed type iron ore in mass ratio 30 without siderite ~
60：40 ~ 70 mixing magnetizing roasts.
3. a kind of complicated difficult according to claim 1 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：Institute
The roasting granularity for the mixed type iron ore raw material stated is 0 ~ 30mm.
4. a kind of complicated difficult according to claim 1 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：Magnetic
Change method of roasting firing stage using the rotary kiln dynamic roasting for ensuring reducing atmosphere or using chamber type electric resistance furnace static state roasting.
5. a kind of complicated difficult according to claim any one of 1-4 selects the magnetizing roast method of mixed type iron ore, it is special
Levy and be：During resultant magnetization roasting chamber type electric resistance furnace, by the way of layer-by-layer distribution is calcined, i.e. the high mixing of sparring mineral content
Sections ore cloth is in roasting pot lower floor, and the low mixed type iron ore cloth of sparring mineral content is on roasting pot upper strata, and wherein lower floor is unworthy of
Match somebody with somebody on a small quantity or be unworthy of reducing agent in reducing agent, upper strata；During resultant magnetization roasting rotary kiln, using the side for entering kiln roasting after mixing
Formula, the i.e. high mixed type iron ore of sparring mineral content and the low mixed type iron ore of sparring mineral content reenter kiln after mixing in proportion
It is unworthy of or with a small amount of reducing agent in roasting, blending process.
6. a kind of complicated difficult according to claim 5 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：Case
The mode of iron ore layer-by-layer distribution roasting among formula resistance furnace roasting pot can be multilayer.
7. a kind of complicated difficult according to claim 5 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：With
During chamber type electric resistance furnace simulation tunnel kiln magnetic roasting process, comprise the following steps：
（1）Mixed type iron ore and mixed type of the siderite mass content 0 ~ 10% by siderite mass content 20 ~ 40%
Iron ore is crushed to 0 ~ 30mm respectively；
（2）The high mixed type iron ore of sparring mineral content is layered on roasting pot lower floor, sparring mineral content is low or without siderite
Mixed type iron ore is layered on roasting pot upper strata, and lower floor's iron ore is 30 ~ 60 than scope with upper strata iron ore weight：40 ~ 70, then
One layer of capping charcoal protection is spread in the roasting pot the superiors；
（3）Enter the mixed material after stove magnetizing roast and be cooled to room temperature, ore grinding-weak magnetic then is carried out to the mixed material after cooling
Choosing, finally gives the magnet fine mineral powder of high-quality, while output magnetic tailing.
8. a kind of complicated difficult according to claim 5 selects the magnetizing roast method of mixed type iron ore, it is characterised in that：This
When invention is applied to rotary kiln magnetic roasting process, comprise the following steps：
（1）Sparring mineral content is divided in 20 ~ 40% mixed type iron ore with sparring mineral content in 0 ~ 10% mixed type iron ore
0 ~ 30mm is not crushed to it；
（2）The high mixed type iron ore of sparring mineral content and sparring mineral content is low or mixed type iron ore of without siderite is pressed
Certain proportion is mixed, and the weight before mixing is 30 ~ 60 than scope：40~70；
（3）Enter the mixed material after kiln magnetizing roast and be cooled to room temperature, ore grinding-weak then is carried out to the mixed material after cooling
Magnetic separation, finally gives the magnet fine mineral powder of high-quality, while output magnetic tailing.
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| CN108504855A (en) * | 2018-05-09 | 2018-09-07 | 东北大学 | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite |
| CN114350940A (en) * | 2021-12-25 | 2022-04-15 | 深圳市考拉生态科技有限公司 | Method for producing alkaline iron ore concentrate by reducing weakly magnetic iron ore |
| WO2023035537A1 (en) * | 2021-09-09 | 2023-03-16 | 鞍钢集团北京研究院有限公司 | Beneficiation method for high carbonate refractory iron ore |
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| WO2023035537A1 (en) * | 2021-09-09 | 2023-03-16 | 鞍钢集团北京研究院有限公司 | Beneficiation method for high carbonate refractory iron ore |
| CN114350940A (en) * | 2021-12-25 | 2022-04-15 | 深圳市考拉生态科技有限公司 | Method for producing alkaline iron ore concentrate by reducing weakly magnetic iron ore |
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