CN104818378A - Preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores - Google Patents

Preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores Download PDF

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CN104818378A
CN104818378A CN201510139825.6A CN201510139825A CN104818378A CN 104818378 A CN104818378 A CN 104818378A CN 201510139825 A CN201510139825 A CN 201510139825A CN 104818378 A CN104818378 A CN 104818378A
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magnetic separation
suspension
iron ore
roasting
concentrate
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CN104818378B (en
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韩跃新
李艳军
高鹏
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Shanghai Fengshi Technology Co ltd
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Northeastern University China
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Abstract

The invention discloses a preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores, and belongs to the technical field of mineral processing. The method comprises the following steps: 1, levigating the complex refractory iron ores, carrying out weak magnetic separation, and carrying out strong magnetic separation on mine tailings; 2, putting concentrate obtained after strong magnetic separation in a suspension roasting furnace, and heating to 450-800DEG C in a suspension state in order to carry out pre-oxidation roasting; 3, introducing nitrogen to displace air, and introducing a reducing gas to carry out reduction in a suspension loose state; 4, introducing air when the temperature decreases to 250-400DEG C in order to oxidize, taking out the obtained material when the temperature decreases to below 100DEG C, and carrying out ore milling; and 5, carrying out third segment magnetic separation, and mixing concentrate obtained after three segment magnetic separation with concrete obtained after the weak magnetic separation to obtain finial concentrate. The method has the advantages of simple process, improvement of the recovery rate of the complex refractory iron ores, strong adaptability, safe and reliable process, uniform and stable product quality, energy saving and consumption reduction.

Description

Pre-concentration-three sections suspension roasting-magnetic separation treatment process of Refractory iron ore stone
Technical field
The invention belongs to technical field of mineral processing, particularly a kind of pre-concentration-three sections suspension roasting-magnetic separation treatment process of Refractory iron ore stone.
Background technology
China's Iron And Steel Industry fast development, iron ore demand sharply rises.China's iron ore grade is low, natural endowment is poor, selecting and purchasing cost is high, causes domestic iron ore to produce the demand that can not meet development of iron & steel industry far away; 2014, China's imported Fe ore 9.33 hundred million tons, external dependence degree is up to 78.5%, and iron ore external dependence degree is too high, and the international discourse of China Steel and security are reduced further; Within 2014, imported Fe ore price is reduced to 70 dollars/below t by the 130 dollars/t at the beginning of the year, and domestic iron ore is corresponding price reduction more than 40% also, causes domestic iron mine to be close to whole industry loss; Iron And Steel Industry is pillar industry in national economy, to the social people's livelihood of guarantee, there is irreplaceable effect, China Supply of iron ore deficiency has become " bottleneck " of restriction national economic development, even becomes a great realistic problem with industrialization, urbanization and modernization whole process; Therefore, the Efficient Development strengthening China's Refractory iron ore resource utilizes has important strategic importance.
Rhombohedral iron ore-spathic iron ore-limonite-magnetite mixed ore is typical Refractory iron ore resource, is distributed widely in the ground such as Liaoning, Shanxi, Shaanxi, Gansu, Xinjiang; The mineral composition of the type iron ore is extremely complicated, essential mineral rhombohedral iron ore, magnetite, spathic iron ore, quartz, ferrodolomite etc., the iron wherein in rhombohedral iron ore accounts for 30 ~ 80%, iron in spathic iron ore accounts for 5 ~ 20%, iron in limonite accounts for 5 ~ 20%, iron in magnetite accounts for 5 ~ 20%; Because this ore deposit mineral composition is complicated, symbiotic relationship is close, and iron-bearing mineral kind is many, and sorting nature difference is large, adopts conventional technique of preparing to be difficult to obtain good technico-economical comparison; Northeastern University and East Anshan sintering plant adopt " stepped-flotation separation " technical finesse East Anshan carbonate containing iron ore (belonging to rhombohedral iron ore-spathic iron ore-limonite-magnetite mixed ore), obtain TFe grade 63.37%, the rate of recovery only 60 ~ 65% industrial technology index.
Magnetizing roasting-magnetic separation refers to carries out complicated physics chemical action by material or ore heating in corresponding atmosphere, makes weak magnetism mineral change ferromagnetism iron mineral (Fe into 3o 4), the magnetic contrast between recycling mineral carries out magnetic separation; Common magnetizing roasting mode has shaft roasting, rotary kiln baking, fluosolids roasting etc.; China's wine steel dressing-works adopts 26 100m 3such ore of shaft roasting technical finesse, roasted ore can obtain the iron ore concentrate of TFe grade 55% ~ 56% through low intensity magnetic separation, iron recovery 70 ~ 80%; But the ore grain size that shaft furnace is applicable to processing is 25 ~ 75mm, and the ore of the 0 ~ 25mm in wine steel dressing-works about 40% can only adopt high intensity magnetic separation process, only can obtain the iron ore concentrate of TFe grade 49.06%, iron recovery 66.59%, causes a large amount of wastes of resource; And shaft roasting technique also exists the problems such as energy consumption is high, roasting time is long, quality product is uneven.
During above magnetizing roasting technical finesse rhombohedral iron ore-spathic iron ore-limonite-magnetite composite ore, there is the problem of following three aspects: 1, because iron mineral character is inconsistent, under identical reductive condition, the reaction of different minerals is asynchronous, and reducing material complete reaction can not generate the Fe of magnetic 3o 4, or occurred that reduction generated non-magnetic FeO, and then cause separation index poor; 2, heating material and reduction synchronously carry out, and reducing atmosphere is difficult to ensure, industrializing implementation difficulty; 3,0 ~ 25mm fine particle stage material cannot be processed.
Summary of the invention
The object of the invention is to provide a kind of pre-concentration-three sections suspension roasting-magnetic separation treatment process of Refractory iron ore stone, by Refractory iron ore stone is first carried out low intensity magnetic separation and high intensity magnetic separation, then preoxidation-reduce-reoxidize suspension roasting, obtains the iron ore concentrate that sorting index is higher.
Method of the present invention is carried out according to the following steps:
1, pre-magnetic separation: Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 40 ~ 80% of gross weight, then carries out low intensity magnetic separation, obtain inferior fine magnetite concentrate and weakly magnetic tailings; Weakly magnetic tailings is carried out high intensity magnetic separation, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing;
2, preoxidation: high intensity magnetic separation concentrate is put into suspension roaster, passes into air in suspension roaster, makes material be suspended state; Preoxidized roast is carried out in heating material to 450 ~ 800 in suspension roaster DEG C, and be now oxidizing atmosphere in suspension roaster, the time of preoxidation is 10 ~ 120s;
3, accumulation of heat reduction: be incubated rear stopping heating, passed into nitrogen replacement and go out air in suspension roaster; Then in suspension roaster, pass into reducing gas, make material be in suspension loose condition (of surface), the heat utilizing material self to save reduces, and the recovery time is 5 ~ 60 seconds;
4, reoxidize: reduction terminates rear stopping and passing into reducing gas, in suspension roaster, pass into nitrogen replacement go out unreacted residual reducing gas, by the water coolant of suspension roaster chuck, suspension roaster is lowered the temperature, when temperature is down to 250 ~ 400 DEG C, in suspension roaster, pass into air reoxidize, when the material in suspension roaster is cooled to below 100 DEG C, material is taken out and carries out secondary grinding;
5, magnetic separation again: when the material after secondary grinding accounts for 40 ~ 80% of gross weight to the part of granularity-0.044mm, the material after secondary grinding is carried out third time magnetic separation under magneticstrength 60 ~ 100kA/m condition, obtains three magnetic concentrates and three magnetic tailings; Three magnetic concentrates and low intensity magnetic separation concentrate are mixed as final concentrate.
In aforesaid method, be in suspension roaster, pass into liquefied gas and light to heat by heating material in suspension roaster.
In aforesaid method, preoxidation, reduce and reoxidize in process, in the chuck of suspension roaster, circulation has water coolant all the time.
In aforesaid method, the high intensity magnetic separation concentrate in step 1 is the mixture containing rhombohedral iron ore, spathic iron ore and limonite.
In aforesaid method, continue to pass into nitrogen in step 3 while passing into reducing gas, the volume flow ratio of reducing gas and nitrogen is 1:(1 ~ 10).
Above-mentioned reducing gas selects carbon monoxide.
In aforesaid method, the preoxidation in step 2 makes spathic iron ore and limonite all be converted into rhombohedral iron ore, wherein spathic iron ore react reaction formula be:
FeCO 3(s)=FeO(s)+CO 2(g) （1）
3FeCO 3(s)= Fe 3O 4(s)+ CO(g)+ 2CO 2(g) （2）
4FeO(s) + O 2(g) = 2Fe 2O 3(s) （3）
Fe 3O 4(s)+ O 2(g) = 2Fe 2O 3 （4）
First there is decomposition reaction by formula (1) and (2) and generate Fe in spathic iron ore 3o 4or FeO, and then be oxidized to Fe by formula (3) and (4) 2o 3;
The reaction formula that limonite reacts is:
Fe 2O 3·2H 2O(s) = Fe 2O 3(s)+ 2H 2O(g) （5）
Limonite is converted into Fe 2o 3.
In aforesaid method, the reaction formula of the reduction in step 3 is:
3Fe 2O 3(s)＋CO(g)＝2Fe 3O 4(s)＋CO 2(g) （6）
Fe in material 2o 3be reduced to Fe 3o 4.
In aforesaid method, in the material after reoxidizing in step 4, main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 50 ~ 90%, Fe 3o 4weight content 5 ~ 45%.
In aforesaid method, a large amount of reaction heat is released in the reaction that reoxidizes in step 4, carries out heat exchange with the water coolant of suspension roaster chuck, is converted into water vapour and reclaims.
In aforesaid method, the rate of recovery of iron is 80 ~ 95%.
The Iron grade of three magnetic concentrates that aforesaid method obtains is 64 ~ 66%, and the Iron grade of final concentrate is 65 ~ 67%.
Compared with prior art, feature of the present invention and beneficial effect are:
(1) for the rhombohedral iron ore-spathic iron ore-limonite-magnetite mixed ore of current China large amount of complex difficulty choosing, the present invention first sub-elects by preliminary election the mineral that wherein magnetic is stronger, then makes the iron mineral uniform conversion of wherein composition inequality be the γ-Fe that magnetic is stronger by preoxidation-reduce-a reoxidize stage 2o 3, the exploitation for this kind of iron ore utilizes and provides a kind of well sorting method; In suspension roaster, the iron mineral in material completes Fe 2o 3→ Fe 3o 4→ γ-Fe 2o 3, FeCO 3→ Fe 2o 3→ Fe 3o 4→ γ-Fe 2o 3and Fe 2o 32H 2o → Fe 2o 3→ Fe 3o 4→ γ-Fe 2o 3conversion process, evenly, magnetic obviously strengthens in iron mineral reaction;
(2) all processes take Reaktionsofen as major equipment, by the control of different oxidations, reducing atmosphere and temperature, makes it that corresponding physicochemical change occur, achieves the phase transformation of iron mineral, finally obtain the product γ-Fe of uniform quality 2o 3, and realize being recycled of waste heat in the process; The high efficiente callback achieving this Refractory iron ore stone eventually through ore grinding-magnetic separation utilizes.The method realizes effective sorting of a large amount of unserviceable rhombohedral iron ore-spathic iron ore-limonite-magnetite composite ore so far on the one hand, vitalizes a large amount of iron ore deposit; Significantly can improve on the other hand the rate of recovery of refractory ore, the more conventional sorting process rate of recovery improves more than 15 percentage points, reaches energy-conservation, consumption reduction, synergy object;
(3) propose rhombohedral iron ore-spathic iron ore-limonite-magnetite mixed ore pre-oxidation technology: compared with other magnetizing roasting technology, ensure that all iron minerals in material all change Fe into by the preoxidation stage 2o 3, ensure that the reduction homogeneity of final product, so stronger to the ore adaptability of process;
(4) mover iron ore accumulation of heat autoreduction technology, only at preoxidation process, ore is heated, when ore enters reduction furnace chamber, the heat utilizing ore self to lay in and reducing gas complete reaction, make heating and Reduced separating, avoid the possibility of reducing gas blast, safe and reliable, for industrialization equipment provides technology prototype;
(5) heterogeneous body ore particles continuous suspended state control techniques in stoving oven is proposed: in whole roasting process, material particles particle under the effect of gas is suspended in gas phase more, be in good dispersion state, gas-solid can be made fully to contact, make reaction heat transfer, mass transfer effect better, roasting process speed of response is fast, and uniform in quality is stablized;
(6) magnetizing roasting product Fe is proposed 3o 4reoxidizing synchronous recovery waste heat technology: by arranging cooling environment, controlling Fe in product of roasting 3o 4to γ-Fe 2o 3transform again, reclaim the heat discharged in this thing inversion of phases process.
Accompanying drawing explanation
Fig. 1 is in the method for embodiments of the invention 1, and phase flow schematic diagram is reduced-reoxidizes in preoxidation-accumulation of heat; In figure, A is the preoxidized roast stage, and B is for passing into nitrogen replacement air event, and C is for passing into the reducing gas stage, and D is for passing into the nitrogen replacement reducing gas stage, and E is temperature-fall period, and F is for reoxidizing the stage;
Fig. 2 is pre-concentration-three sections suspension roasting-magnetic separation process flow schematic diagram of the Refractory iron ore stone of the embodiment of the present invention 1.
Embodiment
The suspension roaster adopted in the embodiment of the present invention is intermittent type suspension roaster, comprise the cooling water jecket of body of heater and sidewall thereof, bottom of furnace body is provided with nitrogen inlet, gas inlet and reducing gas entrance, being provided with gas-permeable nets (air distribution plate) below furnace interior for placing response material makes the gas uniform of circulation distribute, body of heater top is provided with waste gas outlet, below body of heater, sidepiece is provided with liquefied gas burner, and liquefied gas burner is positioned at above gas-permeable nets.
Φ 180mm × 200mm tube ball mill ore grinding is adopted in the embodiment of the present invention.
Adopt Φ 50mm magnetic separation tube to carry out magnetic separation in the embodiment of the present invention to sort.
The Refractory iron ore stone adopted in the embodiment of the present invention is rhombohedral iron ore (Fe 2o 3), spathic iron ore (FeCO 3), limonite (Fe 2o 32H 2and magnetite mixed ore O), Iron grade TFe 27 ~ 35%, by weight percentage containing FeO3 ~ 17%, SiO 230 ~ 50%.
The condition of the low intensity magnetic separation of step 1 in the embodiment of the present invention is 80 ~ 90kA/m, and the condition of high intensity magnetic separation is 600 ~ 800 kA/m.
Material Mossbauer spectrometer after reoxidizing in the embodiment of the present invention detects, and the main component recording material is maghemite γ-Fe 2o 3with magnetite Fe 3o 4; Wherein γ-Fe 2o 3weight content 50 ~ 90%, magnetite Fe 3o 4weight content 5 ~ 45%; All the other are rhombohedral iron ore Fe 2o 3; The Mossbauer spectrometer model adopted is WSSL-10.
In the embodiment of the present invention, the air intake of step 2 is 0.8 ~ 2m/s by the flow velocity of air in suspension roaster.
In the embodiment of the present invention, in step 3, the flow proportional of reducing gas and nitrogen is 0.8 ~ 2m/s by the flow velocity of two kinds of gases in suspension roaster.
Air intake in the embodiment of the present invention in step 4 is 0.8 ~ 2m/s by the flow velocity of air in suspension roaster.
In suspension roaster, pass into liquefied gas and light to heat by heating material in suspension roaster in the embodiment of the present invention.
Embodiment 1
The main component (unit wt%) as shown in table 1 of the Refractory iron ore stone adopted;
Table 1
Component TFe FeO SiO 2 Al 2O 3 CaO
Content 34.43 12.8 49.41 0.15 0.39
Component MgO P S K Na
Content 0.37 0.07 0.05 0.04 0.03
Chemical phase analysis result is as shown in table 2;
Table 2
Method is carried out according to the following steps:
1, pre-magnetic separation: Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 40% of gross weight, then carries out low intensity magnetic separation, obtain inferior fine magnetite concentrate and weakly magnetic tailings; Weakly magnetic tailings is carried out high intensity magnetic separation, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing; High intensity magnetic separation concentrate is the mixture containing rhombohedral iron ore, spathic iron ore and limonite;
2, preoxidation: high intensity magnetic separation concentrate is put into suspension roaster, passes into air in suspension roaster, makes material be suspended state; Heating material to 800 in suspension roaster DEG C is carried out preoxidized roast, and be now oxidizing atmosphere in suspension roaster, the time of preoxidation is 10s;
3, accumulation of heat reduction: be incubated rear stopping heating, passed into nitrogen replacement and go out air in suspension roaster; Then in suspension roaster, pass into CO, make material be in suspension loose condition (of surface), the heat utilizing material self to save reduces, and the recovery time is 5 seconds; Continue while passing into CO to pass into nitrogen, the volume flow ratio of CO and nitrogen is 1:1;
4, reoxidize: reduction terminates rear stopping and passing into CO, in suspension roaster, pass into nitrogen replacement go out unreacted remaining CO, by the water coolant of suspension roaster chuck, suspension roaster is lowered the temperature, when temperature is down to 400 DEG C, in suspension roaster, pass into air reoxidize, when the material in suspension roaster is cooled to below 100 DEG C, material is taken out and carries out secondary grinding; In material after reoxidizing, main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 50%, Fe 3o 4weight content 45%; Reoxidize reaction and release a large amount of reaction heat, carry out heat exchange with the water coolant of suspension roaster chuck, be converted into water vapour and reclaim;
5, magnetic separation again: when the material after secondary grinding accounts for 40% of gross weight to the part of granularity-0.044mm, the material after secondary grinding is carried out third time magnetic separation under magneticstrength 60kA/m condition, obtains three magnetic concentrates and three magnetic tailings; Three magnetic concentrates and low intensity magnetic separation concentrate are mixed as final concentrate;
In aforesaid method, preoxidation, reduce and reoxidize in process, in the chuck of suspension roaster, circulation has water coolant all the time;
The rate of recovery of aforesaid method iron is 95%; The Iron grade of three magnetic concentrates is 66%, and the Iron grade of final concentrate is 67%.
Embodiment 2
The Iron grade TFe 32% of Refractory iron ore stone, by weight percentage containing FeO16%, SiO 245%;
Method is with embodiment 1, and difference is:
(1) Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 50% of gross weight;
(2) heating material to 700 in suspension roaster DEG C is carried out preoxidized roast, the time of preoxidation is 30s;
(3) recovery time is 15 seconds; The volume flow ratio of CO and nitrogen is 1:3;
(4) when temperature is down to 350 DEG C, in suspension roaster, pass into air reoxidize; In material after reoxidizing, main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 60%, Fe 3o 4weight content 33%;
(5) when the material after secondary grinding accounts for 50% of gross weight to the part of granularity-0.044mm, the material after secondary grinding is carried out third time magnetic separation under magneticstrength 70kA/m condition, and the rate of recovery of iron is 90%; The Iron grade of three magnetic concentrates is 65%, and the Iron grade of final concentrate is 66%.
Embodiment 3
The Iron grade TFe 30% of Refractory iron ore stone, by weight percentage containing FeO15%, SiO 238%;
Method is with embodiment 1, and difference is:
(1) Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 60% of gross weight;
(2) heating material to 600 in suspension roaster DEG C is carried out preoxidized roast, the time of preoxidation is 60s;
(3) recovery time is 30 seconds; The volume flow ratio of CO and nitrogen is 1:5;
(4) when temperature is down to 300 DEG C, in suspension roaster, pass into air reoxidize; In material after reoxidizing, main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 80%, Fe 3o 4weight content 14%;
(5) when the material after secondary grinding accounts for 60% of gross weight to the part of granularity-0.044mm, the material after secondary grinding is carried out third time magnetic separation under magneticstrength 80kA/m condition, and the rate of recovery of iron is 86%; The Iron grade of three magnetic concentrates is 65%, and the Iron grade of final concentrate is 66%.
Embodiment 4
The Iron grade TFe 27% of Refractory iron ore stone, by weight percentage containing FeO 3%, SiO 230%;
Method is with embodiment 1, and difference is:
(1) Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 80% of gross weight;
(2) heating material to 450 in suspension roaster DEG C is carried out preoxidized roast, the time of preoxidation is 120s;
(3) recovery time is 60 seconds; The volume flow ratio of CO and nitrogen is 1:10;
(4) when temperature is down to 250 DEG C, in suspension roaster, pass into air reoxidize; In material after reoxidizing, main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 90%, Fe 3o 4weight content 5%;
(5) when the material after secondary grinding accounts for 80% of gross weight to the part of granularity-0.044mm, the material after secondary grinding is carried out third time magnetic separation under magneticstrength 100kA/m condition, and the rate of recovery of iron is 80%; The Iron grade of three magnetic concentrates is 64%, and the Iron grade of final concentrate is 65%.

Claims (8)

1. pre-concentration-three sections suspension roasting-magnetic separation treatment process of Refractory iron ore stone, is characterized in that carrying out according to the following steps:
(1) pre-magnetic separation: Refractory iron ore stone mill ore deposit to the part of granularity-0.074mm is accounted for 40 ~ 80% of gross weight, then carries out low intensity magnetic separation, obtain inferior fine magnetite concentrate and weakly magnetic tailings; Weakly magnetic tailings is carried out high intensity magnetic separation, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing;
(2) preoxidation: high intensity magnetic separation concentrate is put into suspension roaster, passes into air in suspension roaster, makes material be suspended state; Preoxidized roast is carried out in heating material to 450 ~ 800 in suspension roaster DEG C, and be now oxidizing atmosphere in suspension roaster, the time of preoxidation is 10 ~ 120s;
(3) accumulation of heat reduction: be incubated rear stopping heating, passed into nitrogen replacement and go out air in suspension roaster; Then in suspension roaster, pass into reducing gas, make material be in suspension loose condition (of surface), the heat utilizing material self to save reduces, and the recovery time is 5 ~ 60 seconds;
(4) reoxidize: reduction terminates rear stopping and passing into reducing gas, in suspension roaster, pass into nitrogen replacement go out unreacted residual reducing gas, by the water coolant of suspension roaster chuck, suspension roaster is lowered the temperature, when temperature is down to 250 ~ 400 DEG C, in suspension roaster, pass into air reoxidize, when the material in suspension roaster is cooled to below 100 DEG C, material is taken out and carries out secondary grinding;
(5) magnetic separation again: when the material after secondary grinding accounts for 40 ~ 80% of gross weight to the part of granularity-0.044mm, material after secondary grinding is carried out third time magnetic separation under magneticstrength 60 ~ 100kA/m condition, obtains three magnetic concentrates and three magnetic tailings; Three magnetic concentrates and low intensity magnetic separation concentrate are mixed as final concentrate.
2. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, the high intensity magnetic separation concentrate that it is characterized in that in step (1) is the mixture containing rhombohedral iron ore, spathic iron ore and limonite.
3. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, continue to pass into nitrogen while it is characterized in that passing into reducing gas in step (3), the throughput ratio of reducing gas and nitrogen is 1:(1 ~ 10).
4. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, is characterized in that described reducing gas selects carbon monoxide.
5. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, is characterized in that in the material after reoxidizing in step (4), main component is Armco magnetic iron γ-Fe 2o 3and Fe 3o 4; Wherein γ-Fe 2o 3weight content at 50 ~ 90%, Fe 3o 4weight content 5 ~ 45%.
6. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, is characterized in that the Iron grade of three times described magnetic concentrates is 64 ~ 66%, and the Iron grade of final concentrate is 65 ~ 67%.
7. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, is characterized in that the rate of recovery of iron is 80 ~ 90%.
8. pre-concentration-three sections suspension roasting-magnetic separation treatment process of a kind of Refractory iron ore stone according to claim 1, it is characterized in that a large amount of reaction heat is released in the reaction that reoxidizes in step (4), carry out heat exchange with the water coolant of suspension roaster chuck, be converted into water vapour and reclaim.
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