CN1861265B - Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite - Google Patents
Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite Download PDFInfo
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- CN1861265B CN1861265B CN2006100759281A CN200610075928A CN1861265B CN 1861265 B CN1861265 B CN 1861265B CN 2006100759281 A CN2006100759281 A CN 2006100759281A CN 200610075928 A CN200610075928 A CN 200610075928A CN 1861265 B CN1861265 B CN 1861265B
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Abstract
A reductive ore dressing technology for preparing the magnetite concentrate from poor hematite or poor limonite includes such steps as pulverizing said poor hematite or limonite and carbon contained substance, mixing, cold die pressing to obtain lumps, heating at 280-1200 DEG.C for 3-100 min to reduce Fe2O3 to Fe3O4, water cooling, grinding and magnetic separation. The reductive magnetizing ore dressing technology of the invention has advantages of simple technology, low heating temperature, short processing time, low energy consumption, wide adaptability, good maneuverability and dispelling detrimental impurity ability, and is easy to realize industrialized mass production.
Description
Technical field
The present invention relates to a kind of reduction beneficiation method of producing magnetite, belong to the smelting iron and steel technical field by poor red, limonite.
Background technology
The used iron-smelting raw material of iron-smelting blast furnace mainly is an iron ore.According to the national sector standard regulation, the iron-holder of iron ore should could be used as blast furnace ironmaking raw material more than 60%, with regard to requiring the iron ore that enters blast furnace is carried out ore dressing like this.Along with China's rapid development of economy, increasing to the demand of iron ore, and the ironmaking requirement of enterprise has not been satisfied in the exploitation of iron ore.Poor iron ore is mainly rhombohedral iron ore or limonite, and its main component all is Fe
2O
3, reserves are big, and price is low, is easy to exploitation, but because iron-holder is low, is difficult for carrying out ore dressing and is difficult to use in blast furnace ironmaking.
The main ore dressing mode of present poor iron ore is based on gravitational segregation, and other impurity density difference such as poor iron ore and silicon-dioxide are little, the purpose that is difficult to realize ore dressing and upgrades will almost not accomplished the concentrate that grade is brought up to more than 60% at the raw ore of 30-50%.Simultaneously, traditional roasting magnetic beneficiation method, its shortcoming are to raw ore requirement height (requirement is a lump ore, and requires the harmful element content low), energy consumption height, low, the finished product ferrous content height of the rate of recovery.Chinese patent ZL95102339.X discloses a kind of " method of sintering concentrated poor iron ore powder ", and its technology is that the breeze after the poor powdered iron ore water flushing carrying out of the ferric oxide enrichment is added coal dust and water, and the fed to boiler sintering stirs.Sintering temperature is 1000-1200 ℃, time is to be about to low-grade sintering mineral powder in 6-10 hour to become high-grade ore, and ferrous grade is not less than 52% in the ore, and iron protoxide is no more than state-set standard, ton iron cost descends, and adopts this patented method agglomerating ore to be applicable to small blast furnace ironmaking.This patented method has the following disadvantages: the first, and " water flushing carrying out enrichment " just by gravitational segregation, grade does not have too big raising; The second, " temperature is 1000-1200 ℃, and the time is 6-10 hour ", the high temperature sintering energy consumption is too high for a long time, has increased cost; The 3rd, " ferrous grade is not less than 52% in the ore " still do not reach the standard of high-quality ore grade; The 4th, " being applicable to small blast furnace ironmaking ", country has banned use of small furnace now.
How to overcome the shortcoming of traditional method, effectively utilize poor red, limonite, the production technique by science is modified as the concentrate of enrichment iron with it, and (its main component is Fe as magnetite
3O
4) as blast furnace ironmaking raw material,, be the problem that needs to be resolved hurrily at present to reduce ironmaking cost, to remedy the wretched insufficiency of iron ore deposit.
Summary of the invention
The object of the present invention is to provide a kind of reduction beneficiation method of producing magnetite, utilize the reducing property of carbon, the Fe of poor iron ore by poor red, limonite
2O
3Be reduced to Fe
3O
4Thereby, improve the grade of iron ore by ore dressing.
Technical scheme of the present invention is as follows:
A kind of poor iron ore carbon-bearing lump is the beneficiation method of original production magnetite also, comprises the steps:
1. with poor iron ore and carbonaceous material pulverizing and mixing, be pressed into the agglomerate of colding pressing then with certain geometrical shape;
2. after treating the agglomerate drying, insert 280-1200 ℃ stove internal heating 3-100 minute, the trickle of coming out of the stove then cooling;
3. be finely ground to 80-400 purpose powder,, obtain the smart powder of finished iron by the magnetic separator magnetic separation.
Wherein, above-mentioned poor iron ore is generally rhombohedral iron ore or limonite, and described carbonaceous material is selected coal dust, coke powder etc. usually for use, these carbonaceous materials and wherein have volatile reducing substance such as CO, hydrogen etc. can be as the reductive agents of poor iron ore.The blending ratio of poor iron ore and carbonaceous material is decided on the particular case of carbonaceous material, general reduction composition is excessive, prevent the secondary oxidation of iron ore, usually by weight poor iron ore: carbonaceous material=20: 1～mix at 5: 2, mixed by weight 5: 1 with coal as poor iron ore.Granularity is advisable more than 20 orders after the raw material pulverizing, and the too big reaction of granularity is not saturating, and the granularity requirements of carbonaceous material is thin more good more.
The agglomerate of colding pressing that step 1 is made can be a spheric, also can be brick shape, or other Any shape, as the honeycomb coaly.The thickness of brick shape agglomerate preferably is not more than 4cm, is beneficial to the transmission of heat.
Principle of the present invention is as follows:
The present invention manufactures poor iron ore carbon-bearing lump after at first solid reductants such as poor iron ore and coal dust or coke powder being pulverized also abundant mixing.Described poor iron ore carbon-bearing lump is the ferruginous cold pressing block with certain geometrical shape of a kind of carbon containing that forms through the compacting of pelletizer or pressing machine, its principle be powder material is stressed by a certain percentage become in model have definite shape, the lumps material of size, density and intensity.Through test, material powder degree is advisable more than 20 orders, and granularity too senior general causes subsequent reactions not saturating, and wherein the granularity requirements of carbonaceous material is thin more good more.
Because carbon contains uniform distribution in the charcoal agglomerate whole, after agglomerate reaches certain temperature, be distributed in countless carbon granules and ferriferous oxide generation redox reaction in the agglomerate, and, when coal is heated to high enough temp, begin to separate out volatile gases, inflammable gas in the volatile matter is except carbon monoxide and hydrogen, mainly be hydrocarbon polymer, the hydrocarbon polymer secondary resolves into carbon and hydrogen under the high temperature, resolvent again with ferriferous oxide generation redox reaction.The chemical reaction of ferriferous oxide autoreduction is mainly in the carbon-bearing lump:
3Fe
2O
3+C＝2Fe
3O
4+CO
3Fe
2O
3+CO＝2Fe
3O
4+CO
2
3Fe
2O
3+H
2＝2Fe
3O
4+H
2O
For realizing the magnetization of above-mentioned autoreduction, to processing condition require as follows:
1, controlling reaction time and speed of cooling:
The magnetic history of ore is a process being reduced of high price ferric oxide just, and many experimental studies show that the reduction of ferric oxide is to be banded development piecemeal in the middle of traditional roasting magnetization technology.What is called is that ferric oxide and reductive agent are done the time spent piecemeal, and reduction is through Fe
2O
3To Fe
3O
4To FeO to Fe or Fe
2O
3To Fe
3O
4Finish to all stages of Fe.It then is when reduction that what is called is band shape, the surface be reduced intermediary earlier after be reduced, on whole agglomerate cross section, be zonal arrangement by low price iron to iron at high price from outside to inside and constitute.But when being furnished with solid reductant in the agglomerate, reduction only has property piecemeal, and significantly is not band.So, make its lucky Z 250 that reverts to processing requirement as long as controlling reaction time and speed of cooling just are easy to the reduction of controlled oxidation iron.
2, prevent secondary oxidation
The condition that direct reduction takes place is that the gas phase CO equilibrium composition of carbon gasification reaction at a certain temperature is higher than reduction gas phase CO equilibrium composition between ferriferous oxide.Directly reduction is since about 280 degree under the standard state, and spending scope internal heating 3-100 minute in temperature 280～1200 just can be with Fe
2O
3Be reduced to Fe
3O
4The carbonaceous pelletizing reduction process is carried out in oxygen containing atmosphere, low price ferriferous oxide that reduction obtains and the carbon in the agglomerate will be reoxidized, according to such conclusion, inflammable gas is discharged in direct burning carbonaceous agglomerate reduction, carrying out its autoreduction can not carry out, yet lot of experiments result proves, when carbon-bearing lump reduces in oxygen, the inflammable gas that the agglomerate internal-response produces and discharges has hindered the diffusion of oxygen to agglomerate inside in the burning of agglomerate outside surface, makes reduction process smooth.Therefore, carbon-bearing lump can realize that autoreduction is not to carry the high-carbon substantial proportion by the condition of secondary oxidation, reduces contacting of come out of the stove back and oxygen.Reducing the chance that contacts with oxygen can realize by bath or covering fine particles containing carbon.
Poor iron ore carbon-bearing lump autoreduction magnetization technology of the present invention is compared with existing other technologies, and its advantage has:
1, wide adaptability, it is former to can be used for the stable or unsettled ore deposit of grade between 30～50%, and it is strong to dispel the detrimental impurity ability;
2, the grade load-carrying capacity is strong, generally can directly bring up to 30～50% raw ore 60～66% concentrate;
3, easily realize large-scale industrialization production, because it is easy to make poor iron ore carbon-bearing lump, Heating temperature is low, and the time is short, less energy consumption;
4, the simple cost of technology is low, workable.
The present invention has made full use of the favourable condition in China many collieries of how poor iron ore, by poor iron ore carbon-bearing lump also the beneficiation method of original production magnetite truly to solve China's rich ore few, rely on the situation of import high-quality iron ore for a long time.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail, but do not limit the scope of the invention in any form.
Embodiment one:
With grade be 45% limonite and coal (kilocalorie is 5000, and volatilization is divided into 13) by 20: 3 mixed, wet-milling is to 70 orders in ball mill then, sending into pelletizer after the water extracter dehydration, to cause diameter be 6cm, thickness is the oblate spheroid of 2.5cm.Insert after to be dried and be heated to 950 ℃ of reductase 12s in the shaft kiln 0 minute, the trickle of coming out of the stove cooling back fine grinding is to 100 orders, and again by the magnetic separator magnetic separation, the smart powder of the iron after the choosing is sent into the settling tank precipitation.
Embodiment two:
With grade be 43% rhombohedral iron ore and coal (kilocalorie is 5300, and volatilization is divided into 17) by 7: 1 mixed, wet-milling is sent into the fragment of brick that brick press is made 24cm * 12cm * 4cm to 70 orders after the water extracter dehydration in ball mill then.Inserted in the roller kiln boosting to 1000 ℃ autoreduction after to be dried 15 minutes, the trickle of coming out of the stove cooling back fine grinding is to 100 orders, and again by the magnetic separator magnetic separation, the smart powder of the iron after the choosing is sent into the settling tank precipitation.
Embodiment three:
Lean hematite and the coal of grade 30-50% are carried out fragmentation respectively, by the weight ratio of lean hematite and coal is to place mixing machine in by mix at 5: 1, mixed breeze and coal dust are sent into honey-comb briquet and are made cellular ore-coal pellets, after treating ore-coal pellets seasoning or oven dry, the exsiccant ore-coal pellets placed 500～700 ℃ process furnace internal heating 3-5 minute, after the trickle of coming out of the stove the then cooling, fine grinding to 100 in ball mill～200 orders, again by the magnetic separator magnetic separation, obtain the smart powder of finished iron, grade is up to 60-66%.
Claims (6)
1. the poor iron ore carbon-bearing lump beneficiation method of original production magnetite also comprises the steps:
(1) is crushed to more than 20 orders poor iron ore and carbonaceous material and mixing, is pressed into the agglomerate of colding pressing then with certain geometrical shape;
(2) treat the agglomerate drying after, insert 280-1200 ℃ stove internal heating 3-100 minute, the trickle of coming out of the stove then cooling;
(3) be finely ground to 80-400 purpose powder,, obtain the finished iron concentrate by the magnetic separator magnetic separation.
2. the method for claim 1 is characterized in that, described poor iron ore is lean hematite or poor limonite.
3. the method for claim 1 is characterized in that, described carbonaceous material is coal dust and/or coke powder.
4. the method for claim 1 is characterized in that, described poor iron ore and carbonaceous material mix by 20: 1～5: 2 weight ratio.
5. the method for claim 1 is characterized in that, the agglomerate of colding pressing that described step (1) is made is sphere, brick shape or honeycomb briquette shape.
6. method as claimed in claim 5 is characterized in that, when the agglomerate of making was brick shape, the thickness of agglomerate was not more than 4cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100759281A CN1861265B (en) | 2005-04-22 | 2006-04-24 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510068608 CN1676620A (en) | 2005-04-22 | 2005-04-22 | Ore dressing process for reducing magnetic iron ore from hematite carbonaceous pelletizing |
| CN200510068608.9 | 2005-04-22 | ||
| CN2006100759281A CN1861265B (en) | 2005-04-22 | 2006-04-24 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
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|---|---|
| CN1861265A CN1861265A (en) | 2006-11-15 |
| CN1861265B true CN1861265B (en) | 2011-09-07 |
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| CN2006100759281A Expired - Fee Related CN1861265B (en) | 2005-04-22 | 2006-04-24 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191149B (en) * | 2006-11-22 | 2010-05-12 | 中国科学院过程工程研究所 | Coal gasification-pore iron ore magnetic roasting coupling technique and device |
| CN102198509A (en) * | 2010-03-23 | 2011-09-28 | 郑永贤 | Method for producing iron concentrate powder by using reductive magnetizing rotary furnace |
| CN102417970B (en) * | 2011-11-15 | 2013-05-22 | 戴元宁 | Method for reducing, magnetizing and concentrating iron tailings |
| CN102417971B (en) * | 2011-11-15 | 2013-04-10 | 戴元宁 | Reduction magnetization beneficiation method of lean hematite |
| CN103205561B (en) * | 2013-03-18 | 2016-08-24 | 酒泉钢铁(集团)有限责任公司 | Powdery difficulty selects iron ore of low ore grade carbonaceous pelletizing coal-base shaft furnace magnetizing roast method |
| CN104480296B (en) * | 2014-12-19 | 2017-01-04 | 梁刚 | A kind of method and system that speculum iron is changed into magnetic iron ore |
| TWI687520B (en) * | 2017-08-18 | 2020-03-11 | 中國鋼鐵股份有限公司 | High-efficiency metal oxide carbothermal reduction method for producing metal and porous cake used thereby |
| CN114763583B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Preparation method of iron ore powder cold-pressed pellet and application of iron ore powder cold-pressed pellet |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557973A (en) * | 2004-01-17 | 2004-12-29 | 钢铁研究总院 | Method for producing ferrum products using low temperature reduction of iron ore powder |
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2006
- 2006-04-24 CN CN2006100759281A patent/CN1861265B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557973A (en) * | 2004-01-17 | 2004-12-29 | 钢铁研究总院 | Method for producing ferrum products using low temperature reduction of iron ore powder |
Non-Patent Citations (2)
| Title |
|---|
| 郑志良等.浅谈选别褐铁矿.江西冶金18 6.1998,18(6),36-38. |
| 郑志良等.浅谈选别褐铁矿.江西冶金18 6.1998,18(6),36-38. * |
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