CN102311821A - Method for producing natural gas through magnetizing hematite by coke-oven gas - Google Patents
Method for producing natural gas through magnetizing hematite by coke-oven gas Download PDFInfo
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- CN102311821A CN102311821A CN201110239523A CN201110239523A CN102311821A CN 102311821 A CN102311821 A CN 102311821A CN 201110239523 A CN201110239523 A CN 201110239523A CN 201110239523 A CN201110239523 A CN 201110239523A CN 102311821 A CN102311821 A CN 102311821A
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Abstract
The invention discloses a method for synthesizing natural gas through magnetizing hematite by coke-oven gas. The method comprises the following steps of adding hematite powder with particle sizes less than or equal to 2mm into a reactor with a stirring structure, heating, then feeding coke-oven gas for a magnetization reaction, after the coke-oven gas undergoes the magnetization reaction, carrying out decarburization and dehydration to obtain natural gas, wherein non/ weak magnetic Fe2O3 in the hematite powder is reduced to magnetic Fe3O4, carrying a direct pulping process or a wet grinding pulping process on the hematite powder subjected to the magnetization reaction, feeding the pulp obtained by the previous step into a magnetic separator for sorting, and carrying out magnetic mineral dehydration to obtain iron-containing concentrate. Through the method, hematite reduction magnetization and preparation of methane-rich synthetic gas by removal of CO/H2 from coke-oven gas are integrated optimally and thus two purposes are realized simultaneously. The method has simple processes, a low investment cost, good adaptability for all types of hematite, easy sorting of magnetized mineral, high iron concentrate product quality, and good economical efficiency.
Description
Technical field
The present invention is relevant with the dressing method of rhombohedral iron ore, and is also relevant with synthetic natural gas (SNG); More detailed, be to utilize coke-oven gas reduction magnetization difficulty to select low grade hematite, the method for a kind of coke(oven)gas magnetization rhombohedral iron ore coproduction Sweet natural gas of the methane rich of coproduction simultaneously combustion gas.
Background technology
World's iron ore reserves mainly concentrate on Ukraine, Russia, China, Australia and Brazilian, and five state's reserves sums account for 72% of global total reserves.Although China's iron ore reserves are very big, be only second to Ukraine and Russia, occupy the 3rd, lean ore is many, rich ore is few, and average grade is merely 33%, and is lower more than 10% than world average grade, and the difficult low grade hematite accounting nearly 1/4 that sorts.
China is global first big steel country, but the iron ore degree of self-sufficiency descends year by year, and externally degree of complying with increases year by year, annual iron ore dependence on import over half.Therefore, offshore company raises the price to the iron ore of outlet China year by year significantly, causes the Iron and Steel Enterprises in China profit margin to reduce significantly, manages very difficulty, has become external ferrolite supply merchant's profit porter.
Rhombohedral iron ore belongs to weak-magnetic iron ore, and grade is relatively low, and is olitie texture partly, and conventional dressing method is difficult to satisfy the requirement of blast-furnace smelting to composition of ores.Based on this, the researchist sorts rhombohedral iron ore and has carried out big quantity research both at home and abroad.The research of oolitic hematite comprises: dephosphorization, desiliconization, desulfurization, reverse flotation, selectivity are gathered group-reverse flotation, high-gradient magnetic separation, direct-reduction process, acidleach, chloridizing roasting-acid leaching process etc., but the report of successful enrichment seldom [Zhang Jin is auspicious, Hu Li can wait.Difficulty is selected the research and utilization present situation and the prospect of oolitic hematite, Chinese Mining Industry, 2007,16 (7): 74-76].Statement literary composition etc. adopts fixed bed process and fluidized bed process, adopts rotary kiln directly to reduce the magnetic separation test to rhombohedral iron ore, and research shows: 1) directly beyond the reducing hematite equipment hot rotary kiln for well; 2) to make reductive agent good than bituminous coal for hard coal; 3) adopt fixed bed or heat also original product of rotary kiln outward, separate, can obtain to separate preferably index [statement literary composition, Ceng Yongzhen, Chen Qiping through low intensity magnetic separation.Hezhang, Guizhou oolitic hematite directly reduces the magnetic separation experimental study.Metal mine, 1997, (11): 13-16,3].These researchs specifically can be divided into two types: one type is to improve ore-dressing technique, like ultra-fine ore grinding, magnetic separation, flotation and reverse flotation; Two types is to adopt chemical reduction to make the rhombohedral iron ore magnetization to realize that economy sorts.The former maybe can not obtain the high grade iron concentrate more than 60%, or removes weak effects such as detrimental impurity sulphur, phosphorus, silicon, or the process complicacy causes less economical; The latter adopts solid carbon reduction magnetization more, because service temperature is high, how 1000
oAbout C, there are shortcomings such as energy consumption is high, equipment material is big with difficulty of processing, investment is high, reduction back material sintering increase secondary abrasive material cost.
In sum, how select rhombohedral iron ore to realize that economy sorts to the abundant difficulty of domestic reserves, Iron and Steel Enterprises in China is broken away from the depending on unduly of external iron ore, the pricing right that obtains market has important practical significance.
Rely on abundant coking coal resource, through building for many years, Shanxi has become maximum coke production base, the whole nation.At present, the whole province's coking production capacity is about 1.2 hundred million tons, and the production capacity concentration degree is high, mainly is distributed in Lvliang City, Jinzhong City, Changzhi, Taiyuan, Linfen, Yuncheng.These districts and cities' coking scales are big, and production capacity has been assembled 94.25% of the whole province's coking aggregated capacity all above 1,000 ten thousand tons/year, and the coke-oven gas that each districts and cities effluxes in year is all above 2,000,000,000 Nm
3, utilize coke-oven gas for scale and lay a good foundation.
In recent years, more domestic units fully utilize coke-oven gas and have carried out big quantity research, also form many utilisation technologies; Mainly contain: directly as industrial fuel; As the raw material of chemical such as production synthetic ammonia/methyl alcohol, produce carbon black, production methane rich manufactured gas, manufactured fuel gas (SNG).Method so that coke-oven gas is produced SNG can roughly be divided into two types, one type be adopt physical sepn (transformation absorption, freezing) to produce SNG (ZL 2,006 1 adopts the physical method for separation coke(oven)gas to produce the method for natural gas liquids for 0102036.6 1 kinds; 0102038.5 1 kinds of methods of from coke(oven)gas, producing natural gas liquids of ZL 2,006 1) with deep refrigeration; Another kind of is coke-oven gas to be implemented methanation produce SNG.Above method all needs at first to carry out deep purifying to coke-oven gas, and pretreatment process is long, the facility investment height, working cost is big, the SNG that causes being produced because of the high competitive power of cost a little less than.
Summary of the invention
Based on the deficiency that above-mentioned prior art exists, the present invention utilizes contained nearly 70% (CO+H in the coke-oven gas
2) realize reduction magnetization at a lower temperature to rhombohedral iron ore, the iron ore after the magnetization is convenient to sort, and coke-oven gas is because (CO+H
2) be consumed back methane and be able to enrichment and obtain the manufactured gas, manufactured fuel gas.This invented technology route is simple, with the coke-oven gas recycling, and energy-conserving and environment-protective, the method that provides a kind of coke(oven)gas magnetization rhombohedral iron ore to produce Sweet natural gas.
The method that a kind of coke(oven)gas magnetization rhombohedral iron ore provided by the present invention is produced Sweet natural gas; Its said method is that granularity is had in the reactor drum of stirring for the ground hematite of≤2mm adds; The back feeding coke-oven gas that heats up reacts: coke-oven gas makes Sweet natural gas after the decarburization dehydration after the magnetization reaction; Non-in the ground hematite/weak magnetic Fe
2O
3Be reduced to magnetic Fe
3O
4, the breeze that will react again after magnetizing carries out direct slurrying or wet-milling slurrying, and the back gets into magnetic separator and sorts, and magnetic mineral dewaters, and promptly makes to contain iron ore concentrate, and its concrete grammar follows these steps to carry out:
(1) rhombohedral iron ore is crushed to≤2mm, the back adds in the stirred reactor;
(2) ground hematite in the reactor drum is heated to 350-650
oC feeds coke-oven gas again, and reaction 30-240min makes non-in the ground hematite/weak magnetic Fe
2O
3Be reduced to magnetic Fe
3O
4
(3) in the step (2), coke-oven gas after magnetization reaction, (CO+H wherein
2) reaction generation (CO
2+ H
2O), after basic soln washing, drying, make Sweet natural gas;
(4) in the step (2), the breeze after the reaction magnetization carries out direct slurrying or wet-milling slurrying, and the back gets into magnetic separator and sorts: non-/ weak magnetic mineral is a mine tailing; Magnetic mineral dewaters, and makes to contain iron ore concentrate.
In technique scheme, said rhombohedral iron ore is that iron level is the rhombohedral iron ore of 25-55%; The washing of said basic soln is to adopt tail gas elder generation bubbling, feeds 15% the NaOH aqueous solution again and removes CO
2Said drying is to adopt CaCl
2Desiccant dehydration; The said iron ore concentrate that contains is the iron ore concentrate more than 60%.
The method that a kind of coke(oven)gas magnetization of the present invention rhombohedral iron ore is produced Sweet natural gas, compared with prior art, the present invention separates (CO+H with the reduction magnetization of rhombohedral iron ore with coke-oven gas
2) system methane rich Sweet natural gas (SNG) is ingenious integrated, utilized rhombohedral iron ore magnetization reaction consumes to fall (CO+H
2) make methane be able to enrichment, obtain containing the Sweet natural gas of methane more than 80%; And technological process of the present invention is simple; Technico-economical comparison is high; Can obtain simultaneously one-level iron ore concentrate and artificial right gas, both realize selecting the economy of low grade hematite to sort to the difficulty of China's enormous amount, the situation of change China iron ore being depended on unduly import is significant; Produce SNG with coke-oven gas again, replenished the deficiency of China's natural gas, pros and cons get both simultaneously, on method, have substantial progress, have realistic economic meaning, social effect and Significance for Environment.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
The embodiment that a kind of coke(oven)gas magnetization rhombohedral iron ore provided by the present invention is produced the method for Sweet natural gas describes as follows:
The method that a kind of coke(oven)gas magnetization rhombohedral iron ore that embodiment of the present invention is called oneself is produced Sweet natural gas is to select rhombohedral iron ore to the difficulty of the huge iron content 25-55% of China's reserves, at first carries out dry type comminution ore deposit, and breeze gets into the reduction magnetizing assembly, at 350-650
oC feeds coke-oven gas, and reaction 30-240min makes non-in the breeze/weak magnetic Fe
2O
3Be reduced to magnetic Fe
3O
4Reduction magnetization product is looked raw ore embedding cloth fineness difference, selects direct slurrying or further wet-milling slurrying, gets into magnetic separator afterwards and sorts, and magnetic mineral is the iron extract mine producation of iron content more than 60% after dehydration, and non-/ weak magnetic mineral is a mine tailing, abandons it.
In the reduction magnetizing assembly, (the CO+H in the coke-oven gas
2) overwhelming majority and Fe
2O
3Reaction generates (CO
2+ H
2O), wherein methane is inerts e, has neither part nor lot in reaction.Go out to reduce the gas of magnetizing assembly after decarburization dehydration, obtain the manufactured gas, manufactured fuel gas that staple is a methane (SNG).
Substantive distinguishing features of the present invention is " rhombohedral iron ore reduction magnetization " with " coke-oven gas takes off CO/H
2System methane rich manufactured gas, manufactured fuel gas " optimize integratedly, to kill two birds with one stone, technological process is simple, reduced investment, to various rhombohedral iron ore wide adaptabilities, magnetization back mineral are prone to sort and obtain high grade iron concentrate, good economy performance.
The present invention utilizes coke-oven plant's by-product coke producer gas selecting lean hematite than reduction magnetization difficulty under the mild conditions; Making its chalybeate inversion of phases is that Armco magnetic iron is convenient to adopt traditional magnetic selection method to sort; Acquisition is alleviated the situation that Chinese iron ore is depended on import unduly than the iron ore concentrate of higher-grade.The overwhelming majority (H in the while coke-oven gas
2+ CO) be consumed with the rhombohedral iron ore reaction, obtain containing the artificial Sweet natural gas (SNG) of methane more than 80%, can be used as the important supplement of China's natural gas.
A kind of coke(oven)gas magnetization of following further explain embodiment of the present invention rhombohedral iron ore is produced the embodiment of the method for Sweet natural gas:
Embodiment 1
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 28.7%, Armco magnetic iron T wherein
Fe: 1.3%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 350
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 240min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 28.3%, susceptibility is 98.5%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 84.4%, H
23.8%, CO 0.9%, CO
20.0%, O
20.3%, other 10.6% (is mainly N
2).
Embodiment 2
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 39.3%, Armco magnetic iron T wherein
Fe: 1.6%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 450
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 180min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 38.8%, susceptibility is 98.7%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 86.4%, H
22.1%, CO 0.3%, CO
20.0%, O
20.2%, other 11.0% (is mainly N
2).
Embodiment 3
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 42.3%, Armco magnetic iron T wherein
Fe: 1.7%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 550
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 120min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 40.8%, susceptibility is 96.3%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 88.4%, H
21.9%, CO 0.1%, CO
20.0%, O
20.1%, other 9.5% (is mainly N
2).
Embodiment 4
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 47.3%, Armco magnetic iron T wherein
Fe: 1.9%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 650
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 90min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 45.6%, susceptibility is 96.3%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 88.6%, H
21.3%, CO 0.1%, CO
20.0%, O
20.0%, other 10.1% (is mainly N
2).
Embodiment 5
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 39.3%, Armco magnetic iron T wherein
Fe: 1.5%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 580
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 30min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 35.6%, susceptibility is 90.2%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 84.8%, H
26.3%, CO 0.0%, CO
20.0%, O
20.0%, other 8.9% (is mainly N
2).
Embodiment 6
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 36.3%, Armco magnetic iron T wherein
Fe: 1.9%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 520
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 75min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 33.6%, susceptibility is 92.2%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 82.8%, H
25.3%, CO 0.0%, CO
20.0%, O
20.1%, other 11.8% (is mainly N
2).
Embodiment 7
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 25.8%, Armco magnetic iron T wherein
Fe: 1.1%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 460
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 100min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 24.5%, susceptibility is 94.7%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 84.8%, H
23.9%, CO 0.1%, CO
20.0%, O
20.1%, other 11.1% (is mainly N
2).
Embodiment 8
Coke-oven gas composition: CH
425.3%, H
260.5%, CO 6.2%, C
2+Unsaturated hydrocarbons 3.0%, CO
22.0%, O
20.5%, other 2.5% (is mainly N
2);
The rhombohedral iron ore sample ore, T
Fe: 53.8%, Armco magnetic iron T wherein
Fe: 2.3%;
The rhombohedral iron ore sample ore is crushed to-2mm 100%, places anchor formula stirred reactor, be warming up to 500
oC feeds coke-oven gas, and the tail gas elder generation bubbling after the reduction magnetization removes CO through the 15% NaOH aqueous solution
2, relend and help CaCl
2Desiccant dehydration obtains the methane rich manufactured gas, manufactured fuel gas, adopts day island proper Tianjin 17A on-line monitoring manufactured gas, manufactured fuel gas composition.Under nitrogen protection, be cooled to normal temperature behind the reduction magnetization 140min, obtain magnetizing sample ore, through analyzing Armco magnetic iron T
Fe: 50.7%, susceptibility is 94.0%.Magnetization back methane rich manufactured gas, manufactured fuel gas composition: CH
4+ C
2+Unsaturated hydrocarbons 86.8%, H
24.9%, CO 0.0%, CO
20.0%, O
20.0%, other 8.3% (is mainly N
2).
Claims (6)
1. a coke(oven)gas magnetizes the method that rhombohedral iron ore is produced Sweet natural gas; Said method is that granularity is had in the reactor drum of stirring for the ground hematite of≤2mm adds; The back feeding coke-oven gas that heats up reacts: coke-oven gas makes Sweet natural gas after the decarburization dehydration after the magnetization reaction; Non-in the ground hematite/weak magnetic Fe
2O
3Be reduced to magnetic Fe
3O
4, the breeze that will react again after magnetizing carries out direct slurrying or wet-milling slurrying, and the back gets into magnetic separator and sorts, and magnetic mineral dewaters, and promptly makes to contain iron ore concentrate.
2. the method for claim 1, said method follows these steps to carry out:
(1) rhombohedral iron ore is crushed to≤2mm, the back adds in the stirred reactor;
(2) ground hematite in the reactor drum is heated to 350-650
oC feeds coke-oven gas again, and reaction 30-240min makes non-in the ground hematite/weak magnetic Fe
2O
3Be reduced to magnetic Fe
3O
4
(3) in the step (2), coke-oven gas after magnetization reaction, (CO+H wherein
2) reaction generation (CO
2+ H
2O), after basic soln washing, drying, make Sweet natural gas;
(4) in the step (2), the breeze after the reaction magnetization carries out direct slurrying or wet-milling slurrying, and the back gets into magnetic separator and sorts: non-/ weak magnetic mineral is a mine tailing; Magnetic mineral dewaters, and makes to contain iron ore concentrate.
3. according to claim 1 or claim 2 method, said rhombohedral iron ore is that iron level is the rhombohedral iron ore of 25-55%.
4. according to claim 1 or claim 2 method, said basic soln washing are to adopt the tail gas bubbling to feed 15% the NaOH aqueous solution to remove CO
2
5. according to claim 1 or claim 2 method, said drying is to adopt CaCl
2Desiccant dehydration.
6. according to claim 1 or claim 2 method, the said iron ore concentrate that contains is the iron ore concentrate more than 60%.
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| CN102628097B (en) * | 2012-04-28 | 2014-06-18 | 北京科技大学 | Method for preparing iron concentrate powder by reducing and magnetizing red mud in fluidized bed |
| CN103866118A (en) * | 2014-03-12 | 2014-06-18 | 内蒙古科技大学 | Polygeneration system and method for magnetization roasting of refractory iron ore |
| CN103866118B (en) * | 2014-03-12 | 2017-02-15 | 内蒙古科技大学 | Polygeneration system and method for magnetization roasting of refractory iron ore |
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Application publication date: 20120111 |