CN103643030B - With roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material - Google Patents
With roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material Download PDFInfo
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- CN103643030B CN103643030B CN201310588889.5A CN201310588889A CN103643030B CN 103643030 B CN103643030 B CN 103643030B CN 201310588889 A CN201310588889 A CN 201310588889A CN 103643030 B CN103643030 B CN 103643030B
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Abstract
The invention discloses a kind of with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, comprise the following steps: magnetizing roasting process is carried out to raw material roe shape iron ore; Roe shape iron ore comprises at least one in oolitic hematite, minette, roe shape spathic iron ore; Magnetizing roasting process mainly makes the iron-bearing mineral in roe shape iron ore change into Fe by roasting under middle temperature
3o
4for the roasted ore of main component; Mill ore magnetic selection process is carried out to the roasted ore after magnetizing roasting process, obtains high phosphorus iron ore concentrate; Again flotation is carried out to high phosphorus iron ore concentrate and fall phosphorus or phosphorus falls in acidleach, obtain qualified iron ore concentrate.Technical process of the present invention is reasonable, the utilization of resources is abundant, product recovery rate is high, process costs is low, magnetizing roasting is effective, treatment capacity is large, have a extensive future.
Description
Technical field
The invention belongs to the metallurgical iron ore beneficiation technical field combined with ore dressing, particularly relate to a kind of ore-dressing technique method being applicable to roe shape iron ore.
Background technology
Oolitic hematite accounts for 30% of China's hematite reserves, reserves reach 3,700,000,000 tons, oolitic hematite often forms large-scale mine, mainly be distributed in the ground such as the Hunan of south China, Hubei Province, cloud, expensive, osmanthus, because its disseminated grain size is superfine and often and spathic iron ore, chamosite and phosphorus ore containing symbiosis or mutually wrap up layer by layer, monomer whose dissociates difficulty, and ore especially easily forms subparticle after muck and ore grinding, and sorting is also very difficult.Oolitic hematite crosses the problems such as high because iron recovery is not high, phosphorus content is high-leveled and difficult to reduce and to process Financial cost, and being known as both at home and abroad is a kind of pole refractory mineral, and just because of this, such resource fails to obtain effective exploitation and utilization so far.
Along with developing rapidly of China's Iron And Steel Industry, of high grade and iron ore resource that is easily choosing is on the verge of exhaustion, poor, the assorted iron ore resource of rational exploitation and utilization complicated difficult choosing, to alleviation China iron ore disparities between supply and demand, promotes that China's development of iron & steel industry has important practical significance.Especially the primary abundant ore source of China is rare, and the quality characteristic of iron ore " poor, assorted, thin, loose " and lower whole utilization level become the bottleneck of China's development of iron & steel industry.In recent years, because domestic ferrolite supply is in short supply, import volume increases considerably continuously, the international market price of iron ore increases step by step, and this makes the economic benefit of economic security of the country and steel industry be subject to severe challenge.
Expansion can the iron ore deposit amount of industrial utilization, efficiently, reasonably develops above-mentioned all kinds of middle-low grade iron ore deposit, ensures the safety supply of domestic iron ore deposit, and this is the task must adhered to for a long time in China's steel industry and the national economic development.If oolitic hematite huge for reserves can be carried out commercial exploitation effectively and utilization, this is to the self-supporting capability and the degree of protection that improve China iron ore deposit, to the Sustainable development ensureing national economy all tool be of great significance.
Summary of the invention
The technical problem to be solved in the present invention overcomes the deficiencies in the prior art, provide that a kind of technical process is reasonable, the utilization of resources is abundant, product recovery rate is high, process costs is low, magnetizing roasting is effective, treatment capacity is large, have a extensive future with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes be a kind of with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, comprise the following steps:
(1) magnetizing roasting process is carried out to raw material roe shape iron ore; Described roe shape iron ore comprises at least one in oolitic hematite, minette, roe shape spathic iron ore; Described magnetizing roasting process mainly refers to and by roasting, the iron-bearing mineral in roe shape iron ore is changed into Fe under middle temperature
3o
4for the roasted ore of main component, this roasted ore is the artificial magnet ore deposit of reclaiming by ore dressing;
(2) mill ore magnetic selection process is carried out to the roasted ore after step (1) process, obtain high phosphorus iron ore concentrate; For embedding cloth feature features such as () thin, the embedding cloth of such as oolitic hematite disseminated grain size are complicated of step (1) characteristic (magnetic of such as artificial magnetite is weak, coercive force is large, product of roasting easily grind) of roasted ore product and such mineral afterwards, in mill ore magnetic selection processing operation, we can control grinding particle size, are optimized process to magnetic plant; According to the mineral originating from different areas, we can adjust the discontinuous running mode of mill ore magnetic selection processing operation; Can adopt conventional ore grinding, stage equipment during ore grinding, magnetic separation can adopt magnetic separator for artificial magnetite sorting and demagnetizer;
(3) for different Caviar shape iron ore, the high phosphorus iron ore concentrate obtained step (2) carries out flotation and falls phosphorus or phosphorus falls in acidleach, obtains qualified iron ore concentrate.
In above-mentioned ore-dressing technique, preferably, described magnetizing roasting process comprises Magnetization reductive roasting and/or magnetizes neutral roasting;
Described Magnetization reductive roasting mainly refers to by adding reductive agent by the Fe in raw material oolitic hematite and/or minette
2o
3reducing roasting obtains with Fe
3o
4for the roasted ore of main component; Its reaction principle major embodiment is:
Fe
2O
3+C→Fe
3O
4+CO；
Fe
2O
3+CO→Fe
3O
4+CO
2；
Fe
2O
3+H
2→Fe
3O
4+H
2O；
The neutral roasting of described magnetization mainly refers to the FeCO in raw material roe shape spathic iron ore
3neutral roasting obtains with Fe
3o
4for the roasted ore of main component; Its reaction principle major embodiment is:
FeCO
3→ Fe
3o
4+ CO or FeCO
3→ Fe
2o
3+ CO
2;
Fe
2O
3+CO→Fe
3O
4+CO
2。
In above-mentioned ore-dressing technique, preferably, described reductive agent is coal, CO, H
2in one or more; The maturing temperature of described magnetizing roasting process controls at 650 DEG C ~ 950 DEG C; At least one in roasting Fuel Selection Sweet natural gas, coal gas (such as coke-oven gas, blast furnace gas, producer gas etc.), coal.
In above-mentioned ore-dressing technique, preferably, coal selected by described reductive agent, and the consumption as the coal of reductive agent is 2% ~ 8% of raw materials quality; The consumption of described roasting fuel is to provide the heat of 1256MJ ~ 1884MJ as control criterion to raw material per ton.
In above-mentioned ore-dressing technique, preferably, the equipment that described magnetizing roasting process adopts can be chamber type electric resistance furnace (when static roasting) or external-heating rotary kiln (when the experimental phase), but be preferably magnetizing roasting rotary kiln (when dynamic roasting), carry out the Task-size Controlling of the raw material roe shape iron ore of magnetizing roasting process below 15mm (namely carry out fragmentation to raw ore, be preferably below 12mm); The time of magnetizing roasting process is 30min ~ 90min, and roasted ore after magnetizing roasting process completes adopts the mode of below sealing shrend to 70 DEG C to cool, and is oxidized to prevent roasted ore.
In above-mentioned ore-dressing technique, preferably, described mill ore magnetic selection process mainly refers to the ore grinding-classification-low intensity magnetic separation process of described roasted ore being carried out multistage, until granularity-400 order of the high phosphorus iron ore concentrate obtained reaches 70% ~ 95%.
In above-mentioned ore-dressing technique, according to the embedding cloth characteristic of roe shape iron ore, preferably, in the ore grinding-classification-low intensity magnetic separation process of described multistage, after making the ore grinding-classification of first paragraph ,-200 order granularity content account for 50% ~ 80%, then enter low intensity magnetic separation and roughly select throwing tail; The throwing tail rough concentrate obtained after primary grinding magnetic separation process is again through the mill ore magnetic selection process described in 1 ~ 2 section.The magneticstrength of described low intensity magnetic separation is 900Oe ~ 2800Oe.
In above-mentioned ore-dressing technique, preferably, the process that phosphorus falls in described flotation comprises: first carry out decarburization flotation to high phosphorus iron ore concentrate, after decarburization flotation under high-alkali (preferred pH is 10 ~ 11) condition, add for the starch of iron mineral and water glass silicates mineral such as () quartz, then use the gangue mineral in anionic collector reverse flotation high phosphorus iron ore concentrate and phosphorus ore containing, reach the object that phosphorus falls in flotation, described reverse flotation comprises to be roughly selected, scans with selected.The processing parameter condition optimization that phosphorus process falls in above-mentioned flotation comprises:
Slurry temperature: 20 DEG C ~ 35 DEG C;
Pulp density: 25% ~ 35%;
Sodium hydroxide or sodium carbonate amount: 800g/t ~ 2000g/t(sodium hydroxide generally selects 800g/t ~ 1000g/t);
Starch consumption: 500g/t ~ 800g/t;
Water glass consumption: 1000g/t ~ 1500g/t;
(fatty acid) anionic collector consumption: 400g/t ~ 800g/t;
Roughly select the time: 3min ~ 5min;
Scan the time: 7min ~ 10min;
The selected time: 3min ~ 5min.
In above-mentioned ore-dressing technique, for phosphorous higher high phosphorus iron ore concentrate (mainly referring to collophanite), the embedding cloth of phosphorus is wherein difficult to removing in the lattice of iron, and now we preferably adopt acidleach to fall phosphorus mode, and the processing parameter condition that phosphorus falls in described acidleach comprises:
Leach acid concentration (preferably sulfuric acid): 10% ~ 20%;
Extraction temperature: 20 DEG C ~ 60 DEG C;
Stirring intensity during leaching: 50rpm ~ 100rpm;
Extraction time: be no less than 5min;
Leach number of times: be not less than 2 times;
Leach liquor in leaching process can recirculation use, without efflux wastewater in whole flow process.
Adopt above-mentioned ore-dressing technique of the present invention finally can obtain the iron ore concentrate of concentrate grade TFe55% ~ 61%, the rate of recovery 75% ~ 85%.
Compared with prior art, the invention has the advantages that:
1. Tong Guo Dui Caviar shape iron ore of the present invention carries out magnetizing roasting process (especially carrying out magnetizing roasting process in rotary kiln), porous, artificial magnetite that is loose, easily mill can be obtained, magnetizing roasting is effective, and treatment capacity is large, and significantly can reduce follow-up ore grinding cost;
2. adopt ore-dressing technique of the present invention can make full use of the Caviar shape iron ore that is not yet utilized effectively now, and qualified iron extract mine producation can be obtained, this for alleviate China instantly iron ore deposit deficiency, provide the supply capacity tool of China's iron ore to be of great significance.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of ore-dressing technique of the present invention.
Embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
Embodiment 1:
As shown in Figure 1 of the present invention with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, it is that in ore, essential mineral content is as shown in table 1 below with oolitic hematite No. 1 sample ore for raw ore:
Table 1: the mineral content analytical table (unit: %) of the raw ore in embodiment 1
| Mineral | Hematite-limonite | Quartz | Rhombspar | Chlorite | Phosphatic rock | Other |
| Content | 53.1 | 4.5 | 22.8 | 12.4 | 6.2 | 1.0 |
The equipment used in the ore-dressing technique of the present embodiment comprises:
Φ 4.0 × 60m reduction magnetization calcination rotary kiln;
Ball mill;
Screw classifier;
Magnetic separator;
Swirler;
Flotation machine.
The ore-dressing technique of the present embodiment mainly comprises the following steps:
(1) first fragmentation is carried out to the raw ore in the present embodiment, obtain the oolitic hematite raw material of granularity at below 15mm, magnetizing roasting process is carried out to raw material oolitic hematite; Magnetizing roasting process mainly refers under middle temperature by adding the iron-bearing mineral Fe that reductive agent makes in oolitic hematite
2o
3change into Fe
3o
4for the roasted ore of main component, this roasted ore is the artificial magnet ore deposit of reclaiming by ore dressing; Φ 4.0 × 60m reduction magnetization calcination rotary kiln is adopted to carry out reduction magnetization calcination process; The reductive agent added in the present embodiment is coal dust, and the consumption of reductive agent is 3% of raw materials quality; One in roasting Fuel Selection Sweet natural gas, coal gas, coal, the consumption of roasting fuel is to provide the heat of 1256MJ ~ 1884MJ as control criterion to raw material per ton; Maturing temperature controls at 800 DEG C, and the time of magnetizing roasting process is 70min; Roasted ore after magnetizing roasting process completes adopts sealing shrend to be chilled to less than 70 DEG C, is oxidized to prevent roasted ore.
(2) carry out mill ore magnetic selection process to the roasted ore after step (1) process, for step (1) characteristic of roasted ore product and the embedding cloth feature of such mineral afterwards, in mill ore magnetic selection processing operation, we control grinding particle size, discontinuous running mode; Can adopt conventional ore grinding (ball mill), stage equipment (screw classifier) during ore grinding, magnetic separation adopts the magnetic separator for artificial magnetite sorting; Mill ore magnetic selection process mainly refers to the ore grinding-classification-low intensity magnetic separation process of described roasted ore being carried out multistage, ore grinding-the classification of first paragraph is first carried out in the present embodiment, after making first paragraph ore grinding-classification ,-200 order granularity content account for 50% ~ 80%, then enter low intensity magnetic separation and roughly select throwing tail (mine tailing is waste); The throwing tail rough concentrate obtained after primary grinding magnetic separation process carries out twice mill ore magnetic selection process again, and as total mine tailing after the mine tailing merging of mill ore magnetic selection process each time, residue is high phosphorus iron ore concentrate; The magneticstrength of low intensity magnetic separation controls as 900Oe ~ 2800Oe;
(3) the high phosphorus iron ore concentrate obtained step (2) carries out flotation and falls phosphorus, the process that phosphorus falls in flotation comprises: first carry out decarburization flotation to high phosphorus iron ore concentrate, after decarburization flotation under high-alkali (pH is 10 ~ 11) condition, add the starch for iron mineral and water glass, then the gangue mineral in anionic collector reverse flotation high phosphorus iron ore concentrate and phosphorus ore containing is used, reach the object that phosphorus falls in flotation, reverse flotation comprises to be roughly selected, scans with selected, and flotation obtains qualified iron ore concentrate after falling phosphorus; The processing parameter condition that phosphorus process falls in flotation comprises:
Slurry temperature: 20 DEG C ~ 35 DEG C;
Pulp density: 25% ~ 35%;
Sodium carbonate amount: 2000g/t;
Starch consumption: 500g/t ~ 800g/t;
Water glass consumption: 1000g/t;
Anionic collector (fatty acid CY-78) consumption: 600g/t;
Roughly select the time: 3min ~ 5min;
Scan the time: 7min ~ 10min;
The selected time: 3min ~ 5min.
Embodiment 2:
A kind of as shown in Figure 1 of the present invention with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, (namely ore dressing object is identical with embodiment 1 for its raw ore, the equipment used in ore-dressing technique is also identical with embodiment 1, the key step of ore-dressing technique also comprises three steps, wherein step (1) is identical with above-described embodiment 1 with step (2), be only that phosphorus falls in the flotation adopting acidleach to fall in phosphorus alternate embodiment 1 in step (3), the processing parameter condition that phosphorus falls in acidleach comprises:
Leach acid concentration (sulfuric acid): 15%;
Extraction temperature: 60 DEG C;
Stirring intensity during leaching: 50rpm ~ 100rpm;
Extraction time: 5min;
Leach number of times: 2 times;
Leach liquor in leaching process can recirculation use, without efflux wastewater in whole flow process.
The index of the qualified iron ore concentrate obtained in above-described embodiment 1, embodiment 2 is substantially identical, as shown in table 2 below.
Table 2: the qualified iron extract mine producation index obtained in embodiment 1,2
Embodiment 3:
As shown in Figure 1 of the present invention with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, it is that in ore, essential mineral content is as shown in table 3 below with oolitic hematite No. 2 sample ores for raw ore:
Table 3: the mineral content analytical table (unit: %) of the raw ore in embodiment 3
| Mineral | Hematite-limonite | Quartz | Illite | Chlorite | Phosphatic rock | Other |
| Content | 55.5 | 4.0 | 19.8 | 13.3 | 5.4 | 2.0 |
The equipment used in the ore-dressing technique of the present embodiment comprises:
Φ 4.0 × 60m reduction magnetization calcination rotary kiln;
Ball mill;
Screw classifier;
Magnetic separator;
Swirler;
Flotation machine.
The ore-dressing technique of the present embodiment mainly comprises the following steps:
(1) first fragmentation is carried out to the raw ore in the present embodiment, obtain the oolitic hematite raw material of granularity at below 12mm, magnetizing roasting process is carried out to raw material oolitic hematite; Magnetizing roasting process mainly refers under middle temperature by adding the iron-bearing mineral Fe that reductive agent makes in oolitic hematite
2o
3change into Fe
3o
4for the roasted ore of main component, this roasted ore is the artificial magnet ore deposit of reclaiming by ore dressing; Φ 4.0 × 60m reduction magnetization calcination rotary kiln is adopted to carry out reduction magnetization calcination process; The reductive agent added in the present embodiment is coal dust, and the consumption of reductive agent is 3% of raw materials quality; One in roasting Fuel Selection Sweet natural gas, coal gas, coal, the consumption of roasting fuel is to provide the heat of 1256MJ ~ 1884MJ as control criterion to raw material per ton; Maturing temperature controls at 850 DEG C, and the time of magnetizing roasting process is 60min; Roasted ore after magnetizing roasting process completes adopts sealing shrend to be chilled to less than 70 DEG C, is oxidized to prevent roasted ore.
(2) carry out mill ore magnetic selection process to the roasted ore after step (1) process, for step (1) characteristic of roasted ore product and the embedding cloth feature of such mineral afterwards, in mill ore magnetic selection processing operation, we control grinding particle size, discontinuous running mode; Can adopt conventional ore grinding (ball mill), stage equipment (screw classifier) during ore grinding, magnetic separation adopts the magnetic separator for artificial magnetite sorting; Mill ore magnetic selection process mainly refers to the ore grinding-classification-low intensity magnetic separation process of described roasted ore being carried out multistage, ore grinding-the classification of first paragraph is first carried out in the present embodiment, after making first paragraph ore grinding-classification ,-200 order granularity content account for 50% ~ 80%, then enter low intensity magnetic separation and roughly select throwing tail (mine tailing is waste); The throwing tail rough concentrate obtained after primary grinding magnetic separation process carries out twice mill ore magnetic selection process again, and as total mine tailing (can be used as cement mill auxiliary material) after the mine tailing merging of mill ore magnetic selection process each time, residue is high phosphorus iron ore concentrate; The magneticstrength of low intensity magnetic separation controls as 900Oe ~ 2800Oe;
(3) the high phosphorus iron ore concentrate obtained step (2) carries out flotation and falls phosphorus, the process that phosphorus falls in flotation comprises: first carry out decarburization flotation to high phosphorus iron ore concentrate, after decarburization flotation under high-alkali (pH is 10 ~ 11) condition, add the inhibitor for iron mineral and activator, then the gangue mineral in anionic collector reverse flotation high phosphorus iron ore concentrate and phosphorus ore containing is used, reach the object that phosphorus falls in flotation, reverse flotation comprises to be roughly selected, scans with selected, and flotation obtains qualified iron ore concentrate after falling phosphorus; The processing parameter condition that phosphorus process falls in flotation comprises:
Slurry temperature: 20 DEG C ~ 35 DEG C;
Pulp density: 25% ~ 35%;
Sodium carbonate amount: 2000g/t;
Starch consumption: 500g/t ~ 800g/t;
Water glass consumption: 1000g/t;
Anionic collector (fatty acid CY-78) consumption: 600g/t;
Roughly select the time: 3min ~ 5min;
Scan the time: 7min ~ 10min;
The selected time: 3min ~ 5min.
Embodiment 4:
A kind of as shown in Figure 1 of the present invention with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, (namely ore dressing object is identical with embodiment 3 for its raw ore, the equipment used in ore-dressing technique is also identical with embodiment 3, the key step of ore-dressing technique also comprises three steps, wherein step (1) is identical with above-described embodiment 3 with step (2), be only that phosphorus falls in the flotation adopting acidleach to fall in phosphorus alternate embodiment 3 in step (3), the processing parameter condition that phosphorus falls in acidleach comprises:
Leach acid concentration (sulfuric acid): 15%;
Extraction temperature: 60 DEG C;
Stirring intensity during leaching: 50rpm ~ 100rpm;
Extraction time: 5min;
Leach number of times: 2 times;
Leach liquor in leaching process can recirculation use, without efflux wastewater in whole flow process.
The index of the qualified iron ore concentrate obtained in above-described embodiment 3, embodiment 4 is substantially identical, as shown in table 4 below.
Table 4: the qualified iron extract mine producation index obtained in embodiment 3,4
Below be only the preferred embodiment of the present invention; protection scope of the present invention is also not only confined to above-described embodiment; should be understood that; for those skilled in the art; not departing from any equivalent improvement and retouching carried out under the technology of the present invention thinking and principle prerequisite, should be considered as falling into protection scope of the present invention.
Claims (5)
1. with roe shape iron ore for the ore-dressing technique of qualified iron ore concentrate prepared by raw material, comprise the following steps:
(1) magnetizing roasting process is carried out to raw material roe shape iron ore; Described roe shape iron ore comprises at least one in oolitic hematite, minette, roe shape spathic iron ore; Described magnetizing roasting process mainly makes the iron-bearing mineral in roe shape iron ore change into Fe by roasting under middle temperature
3o
4for the roasted ore of main component; The equipment that described magnetizing roasting process adopts is rotary kiln, carries out the Task-size Controlling of the raw material roe shape iron ore of magnetizing roasting process at below 15mm;
(2) mill ore magnetic selection process is carried out to the roasted ore after step (1) process, obtain high phosphorus iron ore concentrate; Described mill ore magnetic selection process mainly refers to the ore grinding-classification-low intensity magnetic separation process of described roasted ore being carried out multistage, until granularity-400 order of the high phosphorus iron ore concentrate obtained reaches 70% ~ 95%; In the ore grinding-classification-low intensity magnetic separation process of described multistage, after making the ore grinding-classification of first paragraph ,-200 order granularity content account for 50% ~ 80%; The magneticstrength of described low intensity magnetic separation is 900Oe ~ 2800Oe;
(3) the high phosphorus iron ore concentrate obtained step (2) carries out flotation and falls phosphorus or phosphorus falls in acidleach, obtains qualified iron ore concentrate;
The process that phosphorus falls in described flotation comprises: first carry out decarburization flotation to high phosphorus iron ore concentrate, after decarburization flotation under high-alkali condition, add starch and water glass, then the gangue mineral in anionic collector reverse flotation high phosphorus iron ore concentrate and phosphorus ore containing is used, reach the object that phosphorus falls in flotation, described reverse flotation comprises to be roughly selected, scans with selected; The processing parameter condition that phosphorus process falls in described flotation comprises:
Slurry temperature: 20 DEG C ~ 35 DEG C;
Pulp density: 25% ~ 35%;
Sodium hydroxide or sodium carbonate amount: 800g/t ~ 2000g/t;
Starch consumption: 500g/t ~ 800g/t;
Water glass consumption: 1000g/t ~ 1500g/t;
Anionic collector consumption: 400g/t ~ 800g/t;
Roughly select the time: 3min ~ 5min;
Scan the time: 7min ~ 10min;
The selected time: 3min ~ 5min;
The processing parameter condition that phosphorus falls in described acidleach comprises:
Leach acid concentration: 10% ~ 20%;
Extraction temperature: 20 DEG C ~ 60 DEG C;
Stirring intensity during leaching: 50rpm ~ 100rpm;
Extraction time: be no less than 5min;
Leach number of times: be not less than 2 times.
2. ore-dressing technique according to claim 1, is characterized in that: described magnetizing roasting process comprises Magnetization reductive roasting and/or magnetizes neutral roasting;
Described Magnetization reductive roasting mainly refers to by adding reductive agent by the Fe in raw material oolitic hematite and/or minette
2o
3reducing roasting obtains with Fe
3o
4for the roasted ore of main component;
The neutral roasting of described magnetization mainly refers to the FeCO in raw material roe shape spathic iron ore
3neutral roasting obtains with Fe
3o
4for the roasted ore of main component.
3. ore-dressing technique according to claim 2, is characterized in that: described reductive agent is coal, CO, H
2in one or more; The maturing temperature of described magnetizing roasting process controls at 650 DEG C ~ 950 DEG C; At least one in roasting Fuel Selection Sweet natural gas, coal gas, coal.
4. ore-dressing technique according to claim 3, is characterized in that: coal selected by described reductive agent, and the consumption as the coal of reductive agent is 2% ~ 8% of raw materials quality; The consumption of described roasting fuel is to provide the heat of 1256MJ ~ 1884MJ as control criterion to raw material per ton.
5. the ore-dressing technique according to any one of Claims 1 to 4, is characterized in that: the time of described magnetizing roasting process is 30min ~ 90min, and roasted ore after magnetizing roasting process completes adopts the mode of below sealing shrend to 70 DEG C to cool.
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