CN113403471B - Treatment method of high-phosphorus oolitic iron ore - Google Patents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/02—Roasting processes
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Abstract
The invention provides a method for treating high-phosphorus oolitic iron ore, which comprises the following steps: a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls; the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30); b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets; c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets; d) And (3) cooling the reduced pellets to room temperature in an air-isolated mode, and then carrying out ore grinding-magnetic separation to obtain a reduced iron product. The method has the advantages of simple process flow, high removal rate of phosphorus in the high-phosphorus oolitic iron ore, high iron grade and recovery rate of the obtained powder reduced iron, and no influence on the reduction effect due to the change of the iron grade and phosphorus content of the raw ore in a certain range.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a method for treating high-phosphorus oolitic iron ore.
Background
With the rapid development of the iron and steel industry in the world, the high-grade iron ore resources are gradually reduced, and the development of the intractable iron ore with rich reserves is of great significance. High-phosphorus iron ore is one of the typical representatives of this group of refractory iron ores, and is mainly distributed in the united states, france, uk, canada, alkinia, nigeria, kazakhstan and china, with total reserves exceeding 2 x 1010t. Because the structure of the ore is complex and the phosphorus content is high, only iron ore concentrate with higher phosphorus content can be obtained by adopting a physical ore dressing process, if the product is used as a raw material for blast furnace ironmaking, almost all phosphorus can be enriched into molten iron in the smelting process, and the high-phosphorus molten iron can not meet the requirement of steelmaking on the phosphorus content of the raw material, so that dephosphorization before the steelmaking process is a reasonable way for realizing the effective utilization of the high-phosphorus iron ore.
At present, the utilization of high-phosphorus iron ore is researched more, and the research on the related processes for improving iron and reducing phosphorus is also quite deep, but the current research mostly adopts methods such as flotation, flotation-magnetic separation combination, chemical leaching, biological leaching and the like, and the methods are simple to operate, but the grade, the recovery rate and the like of the obtained iron ore concentrate are low, and the phosphorus removal effect is poor, so that the research on a method for treating the high-phosphorus iron ore, which is efficient, convenient, environment-friendly and industrially applicable, is extremely important.
Disclosure of Invention
The invention aims to provide a treatment method of high-phosphorus oolitic iron ore, the method has high phosphorus removal rate, the iron grade and recovery rate of the obtained powder reduced iron are high, and the reduction effect is not influenced by the change of the iron grade and phosphorus content of the raw ore within a certain range.
The invention provides a treatment method of high-phosphorus oolitic iron ore, which comprises the following steps:
a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls;
the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30);
b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets;
c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets;
d) And (3) cooling the reduced pellets to room temperature in an air-isolated mode, and then carrying out ore grinding-magnetic separation to obtain a reduced iron product.
Preferably, the high-phosphorus oolitic iron ore is one or more of high-phosphorus oolitic hematite, high-phosphorus oolitic magnetite and high-phosphorus oolitic hematite/magnetite.
Preferably, the particle size of the high-phosphorus oolitic iron ore is less than 1mm, the iron grade is 43-60%, and the mass fraction of phosphorus is less than 1.5%.
Preferably, the mass ratio of the high-phosphorus oolitic iron ore to the dephosphorizing agent to the water is 1: (0.2-0.4): (0.05-0.15).
Preferably, the temperature of the oxidizing roasting is 1000-1500 ℃; the time of oxidizing roasting is 50-100 min.
Preferably, the reducing atmosphere is natural gas pyrolysis gas and/or water gas.
Preferably, the temperature of the reduction roasting is 1100-1300 ℃; the time of the reduction roasting is 150-200 min.
Preferably, the reduced pellets are isolated from air and cooled to room temperature, crushed to-2 mm, and then subjected to two-stage ore grinding-magnetic separation to obtain a reduced iron product.
Preferably, in the two-stage ore grinding-magnetic separation, the content of particles of which the diameter is minus 0.074mm in the first-stage ore grinding is not less than 65 percent, and the magnetic field intensity of the first-stage magnetic separation is 1600-1800 oersted; the content of particles of-0.074 mm in the second-stage ore grinding is not less than 85 percent, and the magnetic field intensity of the second-stage magnetic separation is 1300-1400 oersted.
The invention provides a method for treating high-phosphorus oolitic iron ore, which comprises the following steps: a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls; the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30); b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets; c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets; d) And (3) cooling the reduced pellets to room temperature in an air-isolated mode, and then carrying out ore grinding-magnetic separation to obtain a reduced iron product. The pellet is added with the dephosphorizing agent, the dephosphorizing agent reacts with components in the ore under the oxidizing atmosphere to change the mineral components of the pellet, and meanwhile, phosphorus originally existing in the iron mineral is generated into a single phosphorus-containing mineral, the structure of the ore can be changed, and conditions are created for reduction and dephosphorization of iron. The method has the advantages of simple process flow, high removal rate of phosphorus in the high-phosphorus oolitic iron ore, high iron grade and recovery rate of the obtained powder reduced iron, and no influence on the reduction effect due to the change of the iron grade and phosphorus content of the raw ore in a certain range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flow chart of the treatment method of the high phosphorus oolitic iron ore.
Detailed Description
The invention provides a method for treating high-phosphorus oolitic iron ore, which comprises the following steps:
a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls;
the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30);
b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets;
c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets;
d) And (3) isolating the reduced pellets from air, cooling to room temperature, and then carrying out ore grinding-magnetic separation to obtain a reduced iron product.
The method comprises the steps of firstly mixing raw materials and pressing the raw materials into balls, wherein the raw materials comprise raw ores, a dephosphorizing agent and water, and the mixed balls are obtained by pressing the mixed raw materials into the balls.
In the invention, the raw ore is preferably high-phosphorus oolitic hematite, high-phosphorus oolitic magnetite, high-phosphorus oolitic hematite/magnetite and the like, wherein the high-phosphorus oolitic hematite/magnetite refers to ore containing both the high-phosphorus oolitic hematite and the high-phosphorus oolitic magnetite; the particle size of the high-phosphorus oolitic iron ore is less than 1mm, the grade of iron in the raw ore is preferably 43-60%, and the phosphorus content is less than 1.5%.
The dephosphorizing agent is preferably a mixture of calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is preferably 1: (0.15 to 0.30), specifically, in the embodiment of the present invention, 1.
In the present invention, the mass ratio of the raw ore, the dephosphorizing agent and the water is preferably 1: (0.2-0.4): (0.05 to 0.15), more preferably 1: (0.25 to 0.30): (0.08 to 0.09), specifically, in the embodiment of the present invention, 1.
After the mixed pellet is obtained, the mixed pellet is dried firstly and then is subjected to oxidizing roasting in an oxidizing atmosphere to obtain the oxidizing roasted pellet.
In the invention, the drying temperature is preferably 150-180 ℃, more preferably 160-170 ℃, and in particular, in the embodiment of the invention, the drying temperature can be 150 ℃ or 180 ℃; the drying time is preferably 100 to 120min, more preferably 110 to 120min, and specifically, in the embodiment of the present invention, may be 120min.
Carrying out oxidizing roasting on the dried pellets in an oxidizing atmosphere, wherein the oxidizing atmosphere is preferably air;
in the invention, the temperature of the oxidizing roasting is preferably 1000-1500 ℃, more preferably 1100-1400 ℃, and most preferably 1200-1300 ℃; specifically, in the embodiment of the present invention, the temperature may be 1200 ℃ or 1300 ℃; the time of the oxidizing roasting is preferably 50 to 100min, more preferably 60 to 90min, most preferably 70 to 80min, and specifically, in the embodiment of the present invention, may be 60min or 80min.
The invention adds the dephosphorizing agent with the components of calcium carbonate and calcium fluoride in the oxidizing roasting process, the dephosphorizing agent reacts with the components in the iron ore under the oxidizing atmosphere to change the mineral components of the dephosphorizing agent, and simultaneously, the phosphorus originally existing in the iron ore generates a single phosphorus-containing mineral, the structure of the ore can be changed, and conditions are created for the reduction and dephosphorization of iron.
And carrying out reduction roasting on the pellets after the oxidation roasting in a reducing atmosphere to obtain the reduction roasted pellets.
In the present invention, the reducing atmosphere is preferably natural gas pyrolysis gas and/or water gas; the temperature of the reduction roasting is preferably 1100-1300 ℃, more preferably 1150-1200 ℃, and specifically, in the embodiment of the invention, the temperature can be 1150 ℃ or 1200 ℃; the time of the reduction roasting is preferably 150 to 200min, more preferably 160 to 180min, and specifically, in the embodiment of the present invention, may be 150min or 180min.
In the invention, the pellets after reduction roasting are preferably cooled to room temperature under the condition of air isolation, and more preferably cooled to room temperature in a graphite box under the condition of air isolation to obtain the reduction pellets. The reducing ball needs to be cooled to room temperature under the condition of air isolation, and can be cooled by water or nitrogen as a medium.
After the reducing balls are obtained, the reducing balls are crushed to the particle size of below 2mm (-2 mm), and then two-stage ore grinding-magnetic separation is carried out;
in the invention, the ore grinding magnetic separation is divided into two sections of ore grinding-magnetic separation (which means that the two sections of ore grinding magnetic separation comprise a first section and a second section);
first-stage grinding, and ball-milling the crushed reduced particles until the content of particles with a particle size of-0.074 mm is not less than 65%, such as 65% or 70%; then, carrying out first-stage magnetic separation, wherein the magnetic field intensity of the first-stage magnetic separation is preferably 1600-1800 oersted, and more preferably 1700-1800 oersted;
second-stage ore grinding is carried out to grind the magnetic part material after the first-stage magnetic separation until the content of particles with the particle size of-0.074 mm is not less than 85 percent, such as 85 percent or 95 percent; and then carrying out two-stage magnetic separation, wherein the magnetic field intensity of the two-stage magnetic separation is preferably 1300-1400 oersted, and more preferably 1400 oersted.
In the reduced iron product obtained by the process, the iron grade is more than 93 percent, the iron recovery rate is more than 92 percent, and the phosphorus content is less than 0.08 percent.
The invention provides a method for treating high-phosphorus oolitic iron ore, which comprises the following steps: a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls; the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30); b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets; c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets; d) And (3) cooling the reduced pellets to room temperature in an air-isolated mode, and then carrying out ore grinding-magnetic separation to obtain a reduced iron product. The pellet is added with the dephosphorizing agent, the dephosphorizing agent reacts with components in the ore under the oxidizing atmosphere to change the mineral components of the pellet, and meanwhile, phosphorus originally existing in the iron mineral is enabled to generate a single phosphorus-containing mineral, the structure of the ore can be changed, and conditions are created for reduction and dephosphorization of iron. The method has the advantages of simple process flow, high removal rate of phosphorus in the high-phosphorus oolitic iron ore, high iron grade and recovery rate of the obtained powder reduced iron, and no influence on the reduction effect due to the change of the iron grade and phosphorus content of the raw ore in a certain range.
For further illustration of the present invention, the following will describe the method for treating high phosphorus oolitic iron ore in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
Taking high-phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 55.81% and the phosphorus content of 0.72% as raw ore, and adding 25% of dephosphorizing agent (CaCO) 3 With CaF 2 Calcium fluoride and 9% of water in a mass ratio of 1: 0.15) are uniformly mixed and pressed into balls on a ball press to obtain mixed balls; drying the mixed pellets at 150 ℃ for 120min, and then oxidizing and roasting at 1200 ℃ for 60min; introducing water gas at 1150 ℃ for reduction for 150min, and placing the product in a graphite box to isolate air and cool the product to room temperature to obtain reduction balls; crushing the reducing balls to-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore grinding at the first stage is carried out until the ore grinding at the-200 meshes accounts for 65%, and the magnetic field intensity at the first stage is 1800 oersted; the second-stage grinding is carried out until the ore accounts for 85 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 96.55 percent, the iron recovery rate of 94.99 percent and the phosphorus content of 0.08 percent.
Example 2
Taking high-phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 43.65 percent and the phosphorus content of 0.83 percent as raw ore, and adding 30 percent of dephosphorizing agent (CaCO) 3 With CaF 2 Fluorination ofCalcium is mixed uniformly with water with the mass ratio of 1; drying the mixed pellets at 180 ℃ for 120min, and then oxidizing and roasting at 1300 ℃ for 80min; introducing water gas at 1200 ℃ for reduction for 180min, and then placing the graphite box in a graphite box to isolate air and cool the graphite box to room temperature to obtain reduction balls; finally, crushing the reducing balls to be-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore is ground to be-200 meshes accounting for 70% in one stage, and the magnetic field intensity of the magnetic separation is 1800 oersted in the other stage; the second-stage grinding is carried out until the ore accounts for 95 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 93.28%, the iron recovery rate of 92.30% and the phosphorus content of 0.07%.
Comparative example 1
Taking high-phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 43.65% and the phosphorus content of 0.83% as raw ore, adding only 9% of water without adding a dephosphorizing agent, uniformly mixing, and pressing into balls on a ball press to obtain mixed balls; drying the mixed pellets at 180 ℃ for 120min, and then oxidizing and roasting at 1300 ℃ for 80min; introducing water gas at 1200 ℃ for reduction for 180min, and then placing the graphite box in a graphite box to isolate air and cool the graphite box to room temperature to obtain a reduction ball; crushing the reducing balls to-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore grinding at the first stage is carried out until the ore grinding at the-200 meshes accounts for 75%, and the magnetic field intensity at the first stage is 1800 oersted; the second-stage grinding is carried out until the ore accounts for 90 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 92.35%, the iron recovery rate of 91.48% and the phosphorus content of 0.27%. It can be seen that the process can not produce reduced iron powder with a phosphorus content of less than 0.1% without the addition of a dephosphorizing agent.
Comparative example 2
Similarly, high phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 43.65 percent and the phosphorus content of 0.83 percent is used as raw ore, and 20 percent of CaCO is added 3 And 9% of water, uniformly mixing, and pressing into balls on a ball press to obtain mixed balls; drying the mixed pellets at 180 ℃ for 120min, and then oxidizing and baking at 1300 DEG CBurning for 80min; introducing water gas at 1200 ℃ for reduction for 180min, and then placing the graphite box in a graphite box to isolate air and cool the graphite box to room temperature to obtain reduction balls; crushing the reducing balls to-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore grinding at the first stage is carried out until the ore grinding at the-200 meshes accounts for 70%, and the magnetic field intensity at the first stage is 1800 oersted; the second-stage grinding is carried out until the ore accounts for 95 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 91.15 percent, the iron recovery rate of 89.24 percent and the phosphorus content of 0.17 percent. It can be seen that the addition of calcium carbonate as a dephosphorizing agent does not result in a reduced iron powder with a phosphorus content of less than 0.1%.
Comparative example 3
Taking high-phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 43.65 percent and the phosphorus content of 0.83 percent as raw ore, and adding 30 percent of dephosphorizing agent (CaCO) 3 With CaF 2 Calcium fluoride in a mass ratio of 1: 0.30) and 9% of water, uniformly mixing, and pressing into balls on a ball press to obtain mixed balls; drying the mixed pellets at 180 ℃ for 120min, and then oxidizing and roasting at 1100 ℃ for 80min; introducing water gas at 1050 ℃ for reduction for 180min, and then placing the graphite box in a graphite box to isolate air and cool the graphite box to room temperature to obtain a reduction ball; crushing the reducing balls to-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore grinding at the first stage is carried out until the ore grinding at the-200 meshes accounts for 70%, and the magnetic field intensity at the first stage is 1800 oersted; the second-stage grinding is carried out until the ore accounts for 95 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 89.21%, the iron recovery rate of 92.14% and the phosphorus content of 0.35%. It can be seen that the iron grade and phosphorus content of the reduced iron obtained at the gas reduction temperature of less than 1100 ℃ can not meet the required indexes.
Comparative example 4
Taking high-phosphorus oolitic hematite with the granularity of less than 1mm, the iron grade of 43.65 percent and the phosphorus content of 0.83 percent as raw ore, and adding 30 percent of dephosphorizing agent (CaCO) 3 With CaF 2 Calcium fluoride and 9% of water in a mass ratio of 1: 0.30) are uniformly mixed and pressed into balls on a ball press to obtain mixed balls; the mixed pellet is heated to 180 DEG CDrying for 120min, and oxidizing and roasting at 1150 deg.C for 80min; introducing water gas at 1200 ℃ for reduction for 180min, and then placing the graphite box in a graphite box to isolate air and cool the graphite box to room temperature to obtain reduction balls; crushing the reducing balls to-1 mm, and performing two-stage ore grinding-magnetic separation to obtain powder reduced iron, wherein the ore grinding at the first stage is carried out until the ore grinding at the-200 meshes accounts for 70%, and the magnetic field intensity at the first stage is 1800 oersted; the second-stage grinding is carried out until the ore accounts for 95 percent in a range of-200 meshes, and the magnetic field intensity of the second-stage magnetic separation is 1400 oersted.
Finally, the obtained powdery reduced iron has the iron grade of 90.45 percent, the iron recovery rate of 90.12 percent and the phosphorus content of 0.16 percent. Therefore, the phosphorus content of the powder reduced iron is higher than 0.1 percent when the temperature of oxidizing roasting is reduced to be below 1200 ℃, and qualified products cannot be obtained.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (4)
1. A treatment method of high-phosphorus oolitic iron ore comprises the following steps:
a) Mixing the high-phosphorus oolitic iron ore, a dephosphorizing agent and water, and pressing into balls to obtain mixed balls;
the dephosphorization agent comprises calcium carbonate and calcium fluoride, wherein the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15 to 0.30);
the mass ratio of the high-phosphorus oolitic iron ore to the dephosphorizing agent to the water is 1: (0.2 to 0.4): (0.05 to 0.15);
b) Drying the mixed pellets and then carrying out oxidation roasting to obtain oxidation-roasted pellets; the temperature of the oxidizing roasting is 1200 to 1500 ℃; the time of oxidizing roasting is 50 to 100min;
c) Carrying out reduction roasting on the oxidized and roasted pellets in a reducing atmosphere to obtain reduced pellets; the temperature of the reduction roasting is 1150-1300 ℃; the time of the reduction roasting is 150 to 200min;
d) Cooling the reduced pellets to room temperature in an air-isolated mode, crushing the pellets to be 2mm below zero, and then carrying out two-stage ore grinding and magnetic separation to obtain reduced iron;
in the two-stage ore grinding-magnetic separation, the content of particles in the ore grinding of the first stage until the particle size is-0.074 mm is not less than 65%, and the magnetic field intensity of the magnetic separation of the first stage is 1600 to 1800 oersteds; the content of particles after secondary grinding until the particle diameter is-0.074 mm is not less than 85 percent, and the magnetic field intensity of the secondary magnetic separation is 1300 to 1400 oersted.
2. The treatment method according to claim 1, wherein the high-phosphorus oolitic iron ore is one or more of high-phosphorus oolitic hematite, high-phosphorus oolitic magnetite and high-phosphorus oolitic hematite/magnetite.
3. The treatment method according to claim 1, wherein the high-phosphorus oolitic iron ore has a particle size of less than 1mm, an iron grade of 43 to 60 percent and a phosphorus mass fraction of less than 1.5 percent.
4. The process according to claim 1, characterized in that said reducing atmosphere is natural gas pyrolysis gas and/or water gas.
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| WO2023162729A1 (en) * | 2022-02-28 | 2023-08-31 | 株式会社神戸製鋼所 | Iron source production method |
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| CN116024427B (en) * | 2023-01-04 | 2023-09-12 | 长沙氢冶钢铁科技有限公司 | Method for preparing low-phosphorus molten iron based on high-temperature melting of high-phosphorus iron ore metallization product |
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| JP2003003206A (en) * | 2001-06-19 | 2003-01-08 | Sumitomo Metal Ind Ltd | Dephosphorizing agent, dephosphorization method and method for using slag produced by dephosphorization |
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| CN104212929B (en) * | 2014-08-19 | 2016-06-22 | 北京神雾环境能源科技集团股份有限公司 | The iron smelting method of gas-based shaft kiln directly reduced-magnetic separation separating treatment height phosphorus ore |
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| CN104451016B (en) * | 2014-11-25 | 2017-11-03 | 神雾科技集团股份有限公司 | The method that metallic iron is separated from phosphorus-containing iron ore |
| EP3374531B1 (en) * | 2015-11-13 | 2020-10-28 | Danieli & C. Officine Meccaniche S.p.A. | Method and apparatus for dephosphorization of iron ore |
| CN105695734A (en) * | 2016-02-24 | 2016-06-22 | 武汉科技大学 | Industrial production method for conducting iron increase and phosphorous reduction on high-phosphorus oolitic hematite |
| JP2018197385A (en) * | 2017-05-24 | 2018-12-13 | 住友金属鉱山株式会社 | Phosphorus removing method, and valuable metal recovering method |
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| JP2003003206A (en) * | 2001-06-19 | 2003-01-08 | Sumitomo Metal Ind Ltd | Dephosphorizing agent, dephosphorization method and method for using slag produced by dephosphorization |
| CN102363824A (en) * | 2011-10-14 | 2012-02-29 | 昆明理工大学 | Premelted dephosphorizer for hot metal dephosphorization and preparation method thereof |
| CN103789477A (en) * | 2014-02-26 | 2014-05-14 | 北京科技大学 | Method for producing direct reduced iron by high phosphorus oolitic hematite and blast furnace ash |
| CN104099465A (en) * | 2014-07-25 | 2014-10-15 | 北京科技大学 | Method for producing reduced iron power by self-catalysis reduction of high-phosphorus oolitic hematite |
| WO2017081646A1 (en) * | 2015-11-13 | 2017-05-18 | Danieli & C. Officine Meccaniche S.P.A. | Method and apparatus for the dephosphorization of iron ore |
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