CN107119185B - 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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- CN107119185B CN107119185B CN201710289159.3A CN201710289159A CN107119185B CN 107119185 B CN107119185 B CN 107119185B CN 201710289159 A CN201710289159 A CN 201710289159A CN 107119185 B CN107119185 B CN 107119185B
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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 methods that complicated difficult selects mixed type iron ore.It is according to the mineral composition of mixed type iron ore, in such a way that low with the sparring mineral content or mixed type iron ore without siderite of the high mixed type iron ore of sparring mineral content carries out resultant magnetization roasting by a certain percentage, weak magnetism mineral in mixed type iron ore are converted into ferromagnetism iron mineral, Iron grade and the higher iron ore concentrate of iron recovery index can be obtained by conventional weak magnetic separation process in roasted ore.The magnetizing roast method is applicable to the coal base reductions technique such as tunnel oven, rotary kiln, and during magnetic roasting process, can be unworthy of in roasting object or be incorporated reducing agent less, 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 technique
China's iron ore rich ore is few, lean ore is more, and 97% iron ore is 30% low-grade iron ore below, and the country remains
Mixed type iron ore is selected in the complicated difficult not being exploited largely.
Since entering 2l century, iron ore resource demand is faced with China's steel industry in situation is gradually increasing
Huge pressure, therefore, development and utilization China's complicated difficult select mixed type iron ore, and the development to China's steel industry is supported is supported
Imperial world's iron ore market risk, is of great immediate significance and far-reaching historic significance.
Currently, China's complicated difficult, which selects mixed type iron ore mainly, following three kinds of disposal options:
1, only the ferromagnetism iron mineral in mixed type iron ore is recycled, the mixed type iron ore after exploitation
First be crushed, dry type pre-selection, the mixed type iron ore after pre-selection based on magnetic iron ore enter ore grinding-weak magnetic separation process into
Row recycles, and the mixed type iron ore after pre-selection based on siderite, red (brown) iron ore is stored up as barren rock, causes iron ore
The wasting of resources, and occupy a large amount of soils.Such as wine steel Orebody in Jingtieshan periphery mine, find out iron ore resource amount total 2688.7 ten thousand
Ton, shares eight ore bodies, is the different typical hybrid sections ore of mineral composition, mating to select factory by above-mentioned technological design, leads
Cause grinding particle size in -400 mesh content 95%, magnetic concentrate grade is 57% or so, and iron recovery can be only achieved 44 ~ 50%, select ratio
Up to 4.02 times.
2, the ferromagnetism iron mineral in 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 recycles iron ore concentrate.In the presence of
Main problem: (1) barren rock or tailing that weak magnetic separation process is dished out are mainly based on siderite, red (brown) iron ore, 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 broken
Broken, ore grinding, magnetic separation, high intensity magnetic separation stage are also required to multistage grinding, magnetic separation.
3, magnetizing roast is directly carried out to mixed type iron ore.Existing main problem: (1) with siderite based on, contain
Since 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) cross and restore, be difficult to recycle after generating FeO, influence magnetic separation index, and after roasting in flue gas
CO concentration is high, not only causes to waste to the energy, but also pollute the environment；(2) siderite, the weak magnetics such as limonite, bloodstone are free of
Property iron mineral content summation be more than the ferromagnetisms iron mineral content such as magnetic iron ore mixed type iron ore roasting after reducing agent consume
Amount is big, roasts at high cost.
Summary of the invention
The object of the present invention is to provide a kind of magnetizing roast methods 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 is low with sparring mineral content 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 magnetic separation problem at high cost.
In order to achieve the object of the present invention, the present invention adopts the following technical scheme:
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, specific as follows: according to the mine of mixed type iron ore
Object composition, low with the sparring mineral content or mixed type iron ore without siderite of the high mixed type iron ore of sparring mineral content is pressed
Certain proportion carries out resultant magnetization roasting.
Low with the sparring mineral content or mixing sections without siderite of the high mixed type iron ore of the sparring mineral content
Ore 30 ~ 60:40 in mass ratio ~ 70 mixes magnetizing roast.
The roasting granularity of the 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
The roasting of furnace static state.When resultant magnetization roasting chamber type electric resistance furnace, by the way of layer-by-layer distribution roasting, i.e. sparring mineral content is high
Mixed type iron ore cloth is in roasting pot lower layer, and the low mixed type iron ore cloth of sparring mineral content is on roasting pot upper layer, wherein lower layer
It is unworthy of reducing agent, reducing agent is matched on a small quantity or is unworthy of on upper layer；When resultant magnetization roasting is with rotary kiln, using entering kiln roasting after mixing
The low mixed type iron ore of mode, the i.e. high mixed type iron ore of sparring mineral content and sparring mineral content reenters after mixing in proportion
Kiln roasts, and is unworthy of in blending process or with a small amount of reducing agent.
The mode of iron ore layer-by-layer distribution roasting in above-mentioned chamber type electric resistance furnace roasting pot can be multilayer.
When the present invention uses chamber type electric resistance furnace simulation tunnel oven magnetic roasting process, including the following steps:
(1) mixed type iron ore (weight of iron in mixed type iron ore by siderite mass percentage 20 ~ 40%
Content is 25 ~ 40% i.e.: TFe25 ~ 40%) with mixed type iron ore (iron in mixed type iron ore of the sparring mineral content 5 ~ 10%
Mass content is 25 ~ 40% i.e.: TFe25 ~ 40%) it is crushed to 20 ~ 30mm respectively；
(2) the high mixed type iron ore of sparring mineral content is layered on roasting pot lower layer, sparring mineral content is low or is free of sparring
The mixed type iron ore of mine is layered on roasting pot upper layer, and lower layer's iron ore and upper layer iron ore weight ratio range are 30 ~ 60:40 ~ 70,
Then one layer of capping charcoal protection is spread in roasting pot top layer；
(3) mixed material after entering furnace magnetizing roast is cooled to room temperature, and is then ground to mixed material after cooling
Mine-low intensity magnetic separation finally obtains good magnet fine mineral powder, while output magnetic tailing.
When the present invention uses chamber type electric resistance furnace simulation tunnel oven 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, including the following steps:
(1) by sparring mineral content 20 ~ 40% mixed type iron ore (weight of iron content in mixed type iron ore is 25 ~
40% i.e.: TFe25 ~ 40%) and mixed type iron ore (weight of iron content in mixed type iron ore of the sparring mineral content 5 ~ 10%
It i.e. for 25 ~ 40%: TFe25 ~ 40%) is crushed to 20 ~ 30mm respectively；
(2) the mixed type iron ore that the high mixed type iron ore of sparring mineral content is low with sparring mineral content or without siderite
Stone mixes by a certain percentage, and the weight ratio range before mixing is 30 ~ 60:40 ~ 70；
(3) mixed material after entering kiln magnetizing roast is cooled to room temperature, and is then ground to mixed material after cooling
Mine-low intensity magnetic separation finally obtains good magnet fine mineral powder, while output magnetic tailing.
Main chemical reactions formula of the invention are as follows:
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 carries out at 392 DEG C)
3Fe2O3+CO=2Fe3O4+CO2 (3)
(Fe2O3Reduction reaction)
The present invention is applied to tunnel oven magnetic roasting process principle, according to the characteristics of heat transfer of tunnel oven, kiln car upper layer iron ore
Stone is heated at first, and material temperature highest, after a small amount of siderite of upper layer mixed type iron ore, limonite are thermally decomposed, lower layer's siderite
The high mixed type iron ore of content starts to be thermally decomposed, itself is being converted to ferromagnetism Fe3O4While, the CO of output is under
Fe in layer and upper layer iron ore2O3It is restored, is converted to ferromagnetism Fe3O4, while effectively controlling the reduction in the bed of material
Property atmosphere, makes the Fe in 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
Sparring mineral content is high after the low or mixed type iron ore without siderite of mineral content mixes by a certain percentage, in roasting process mixes
Mould assembly iron ore starts to be thermally decomposed, itself is being converted to ferromagnetism Fe3O4While, the CO of output works as bed of material iron ore
Middle Fe2O3It is restored, is converted to ferromagnetism Fe3O4, while the reducing atmosphere in the bed of material is effectively controlled, make iron ore
Fe in the middle3O4With newborn Fe3O4FeO will not be reduced into.
The present invention controls iron ore granularity in the reason of 0 ~ 30mm, appropriate to reduce iron ore granularity, can accelerate it also
Former speed, and the iron ore siderite of big granularity, limonite decomposition rate are less than small grain size, select the granularity model of 0 ~ 30mm
It encloses and bed of material reducing atmosphere also can be effectively controlled.
The invention has the benefit that
(1) present invention solves after the high mixed type iron ore magnetizing roast of sparring mineral content since reducing atmosphere is strong, leads
Cause the magnetic iron ore (Fe itself contained3O4) reduction is crossed, the problem of recycling is difficult to after generating FeO；
(2) it is roasted by using resultant magnetization, the low or mixed type iron ore without siderite of sparring mineral content is magnetizing
It can be unworthy of when roasting or match reducing agent less, to reduce magnetizing roast cost；
(3) the mixed type iron ore that the high mixed type iron ore of sparring mineral content is low with sparring mineral content or without siderite
After stone resultant magnetization roasting by a certain percentage, the reducing atmosphere in the bed of material can be effectively controlled, reduce CO in discharged gas fume
Content, effects of energy saving and emission reduction are obvious；
(4) present invention process process is simple, easy to spread, solves mixed type iron ore magnetic dressing process complexity, magnetic separation refers to
Mark the problem poor, calcining magnetic separation is at high cost.
Detailed description of the invention
Fig. 1 is the tunnel oven process flow chart of magnetizing roast method of the present invention；
Fig. 2 is the rotary kiln technology flow chart of magnetizing roast method of the present invention.
Specific embodiment
Mixed type iron ore of the present invention mainly includes following several: (1) with siderite based on, containing limonite,
The mixed type iron ore of the iron minerals such as magnetic iron ore, bloodstone；(2) based on red (brown) 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 magnetisms mineral content such as siderite, limonite, bloodstone
Summation is more than the mixed type iron ore of the ferromagnetisms iron mineral contents such as magnetic iron ore；(4) siderite, limonite, bloodstone etc. are free of
The summation of weak magnetism mineral content is more than the mixed type iron ore of the ferromagnetisms iron mineral contents such as magnetic iron ore.
Detailed description of the invention and beneficial effect of the invention are further described in detail with reference to the accompanying drawing.
Embodiment 1
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, comprising the following steps:
Step 1: certain mine ore body sparring mineral content 20%, full Iron grade 33.71% and VIII ore body siderite are contained respectively
The mixed type iron ore for measuring 5%, full Iron grade 32.48% is crushed to 20mm；
Step 2: it weighs 20mm ore body iron ore 200g and is laid on roasting pot lower layer, weigh VIII ore body iron ore of 20mm
200g is laid on roasting pot upper layer, and VIII ore body iron ore stone surface covers 20g semi-coke again；
Step 3: controlling box resistance furnace temperature is 850 DEG C, begins placing into roasting, calcining time 50min；
Step 4: after roasting, water seal is cooled to room temperature after roasting pot is taken out；
Step 5: mixed material after cooling is by broken, ore grinding, and it is 90% that grinding particle size, which controls -200 mesh contents, then
It is sorted by magnetic separation tube, 1250 Oe of magnetic separation field strength obtains iron ore concentrate.
Iron ore concentrate is sampled and main indicator detects, iron concentrate grade is 55.46% after detection, iron recovery is
82.44%。
Embodiment 2
A kind of complicated difficult selects the magnetizing roast method of mixed type iron ore, comprising the following steps:
Step 1: certain mine ore body sparring mineral content 20%, full Iron grade 33.71% and VIII ore body siderite are contained respectively
The mixed type iron ore for measuring 5%, full Iron grade 32.48% is crushed to 30mm；
Step 2: VIII ore body iron ore 500g of 30mm ore body iron ore 500g and 30mm is weighed, then by two kinds of iron ores
Stone mixes；
Step 3: control 750 DEG C of rotary kiln baking section kiln temperature, revolving speed 90s/r, filling rate 25%, high temperature section calcining time
20min starts to roast into kiln；
Step 4: after roasted ore fully enters rotary kiln cooling section, power-off cooling, discharging after cooling section sealing is air-cooled；
Step 5: mixed material after cooling is by broken, ore grinding, and it is 85% that grinding particle size, which controls -200 mesh contents, then
It is sorted by magnetic separation tube, 1250 Oe of magnetic separation field strength obtains iron ore concentrate.
Iron ore concentrate is sampled and main indicator detects, iron concentrate grade is 56.03% after detection, iron recovery is
82.85%。
Claims (4)
1. a kind of magnetizing roast method that complicated difficult selects mixed type iron ore, it is characterised in that: according to the mine of mixed type iron ore
Object composition, the mixed type for being 5 ~ 10% with siderite mass content by the mixed type iron ore that siderite mass content is 20 ~ 40%
Iron ore is crushed to 20 ~ 30mm respectively, and 30 ~ 60:40 in mass ratio ~ 70 mixes magnetizing roast, magnetizing roast method firing stage
It is roasted using the rotary kiln dynamic roasting for ensuring reducing atmosphere or using chamber type electric resistance furnace static state；Resultant magnetization is roasted with box
When resistance furnace, by the way of layer-by-layer distribution roasting, i.e. the high mixed type iron ore cloth of sparring mineral content is in roasting pot lower layer, water chestnut
The low mixed type iron ore cloth of iron ore content is on roasting pot upper layer, and wherein lower layer is unworthy of reducing agent, and upper layer is matched a small amount of or is unworthy of also
Former agent；When resultant magnetization roasting is with rotary kiln, by the way of kiln roasting is entered after mixing, i.e. the high mixing sections of sparring mineral content
Ore and the low mixed type iron ore of sparring mineral content reenter kiln roasting after mixing in proportion, be unworthy of in blending process or with a small amount of
Reducing agent.
2. the magnetizing roast method that a kind of complicated difficult according to claim 1 selects mixed type iron ore, it is characterised in that: case
The mode of iron ore layer-by-layer distribution roasting in formula resistance furnace roasting pot can be multilayer.
3. a kind of complicated difficult according to claim 1 or 2 selects the magnetizing roast method of mixed type iron ore, feature exists
In: when simulating tunnel oven magnetic roasting process with chamber type electric resistance furnace, including the following steps:
(1) mixed type iron ore and mixed type of the siderite mass content 5 ~ 10% by siderite mass content 20 ~ 40%
Iron ore is crushed to 20 ~ 30mm respectively；
(2) the high mixed type iron ore of sparring mineral content is layered on roasting pot lower layer, sparring mineral content is low or without siderite
Mixed type iron ore is layered on roasting pot upper layer, and lower layer's iron ore and upper layer iron ore weight ratio range are 30 ~ 60:40 ~ 70, then
One layer of capping charcoal protection is spread in roasting pot top layer；
(3) mixed material after entering furnace magnetizing roast is cooled to room temperature, and then carries out ore grinding-weak magnetic to mixed material after cooling
Choosing, finally obtains good magnet fine mineral powder, while output magnetic tailing.
4. a kind of complicated difficult according to claim 1 or 2 selects the magnetizing roast method of mixed type iron ore, feature exists
In: when being applied to rotary kiln magnetic roasting process, including the following steps:
(1) mixed type iron ore and mixed type iron ore of the siderite mass content 5 ~ 10% by sparring mineral content 20 ~ 40%
Stone is crushed to 20 ~ 30mm respectively；
(2) low with the sparring mineral content or mixed type iron ore without siderite of the high mixed type iron ore of sparring mineral content is pressed
Certain proportion mixes, and the weight ratio range before mixing is 30 ~ 60:40 ~ 70；
(3) mixed material after entering kiln magnetizing roast is cooled to room temperature, and it is weak then to carry out ore grinding-to mixed material after cooling
Magnetic separation finally obtains good magnet fine mineral powder, while output magnetic tailing.
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| CN108504855B (en) * | 2018-05-09 | 2020-03-10 | 东北大学 | Method for producing iron ore concentrate by using siderite as reducing agent through suspension magnetization roasting |
| CN108425008B (en) * | 2018-06-21 | 2019-12-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of classification cloth sintering method of siderite |
| CN113877851B (en) * | 2021-09-09 | 2024-01-26 | 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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