CN107244694B - Utilize the method for low-grade ilmenite production acid-dissolved titanium slag - Google Patents

Utilize the method for low-grade ilmenite production acid-dissolved titanium slag Download PDF

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CN107244694B
CN107244694B CN201710318203.9A CN201710318203A CN107244694B CN 107244694 B CN107244694 B CN 107244694B CN 201710318203 A CN201710318203 A CN 201710318203A CN 107244694 B CN107244694 B CN 107244694B
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reducing agent
titanium slag
magnetic separation
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titanium
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CN107244694A (en
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孙志国
冯志泉
李佳徽
刘永吉
杜文宇
王亚洲
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Chaoyang Bosheng Metallurgical Technology Co ltd
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CHAOYANG KIMHO POWDER METALLURGY MATERIALS Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/04—Oxides; Hydroxides
    • C01G23/047—Titanium dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
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  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A method of acid-dissolved titanium slag is produced using low-grade ilmenite, the titanium-iron powder that ilmenite is obtained after sorting, with semi-coke and metallurgical coke, sodium sulphate and ferrous sulfate, cosolvent fluorite or borax, which are sent into batch mixer, is uniformly mixed so as to obtain compound powder, with reducing agent metallurgical coke, semi-coke and dolomite are fitted into fire-resistant can together, when charging, compound powder does not mix mutually with reducing agent, outermost layer is reducing agent, internal layer is solid compound powder, enter tunnel oven after tinning to be restored, ilmenite after carrying out reduction is after jaw crushing crusher machine, through two stage grinding and magnetic separation twice, obtain high-grade acid-dissolved titanium slag.Advantage is: this method rational technology, can reduce production energy consumption relative to electric furnace smelting process, low in cost, and can guarantee the rate of recovery of product, is suitble to large-scale industrial production.

Description

Utilize the method for low-grade ilmenite production acid-dissolved titanium slag
Technical field
The present invention relates to a kind of methods using low-grade ilmenite production acid-dissolved titanium slag.
Background technique
Titanium dioxide is commonly called as titanium dioxide, with excellent covering power and color fastness, is known as " king of white pigment ", It is widely used in the industries such as coating, plastics, ink, paper, chemical fibre, daily use chemicals, medicine and food.Acid-dissolved titanium slag and sulfuric acid it is molten Solution property is relatively high, is the primary raw material of production of titanium dioxide by sulfuric acid method therefore.In recent years, as the demand of titanium dioxide increasingly increases Greatly, the demand as the acid-dissolved titanium slag of one of production titanium dioxide important source material is also gradually increased.
Currently, the method that China produces sour slag is that ilmenite is passed through the grade of titanium dioxide that electric furnace reduction melting obtains >=70% titaniferous smelting slag, it is larger that electric furnace smelting process produces acid-dissolved titanium slag energy consumption, and the rate of recovery is low, the yield of product It is small, high production cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide it is a kind of using low-grade ilmenite production acid-dissolved titanium slag method, This method rational technology can reduce production energy consumption relative to electric furnace smelting process, low in cost, and can guarantee the recycling of product Rate is suitble to large-scale industrial production.
The technical solution of the invention is as follows:
A method of acid-dissolved titanium slag being produced using low-grade ilmenite, the specific steps of which are as follows:
1, mixing, tinning, reduction
The titanium-iron powder that ilmenite is obtained after sorting is sent into batch mixer with reducing agent I, catalyst and cosolvent and is mixed Afterwards, compound powder is fitted into the fire-resistant can of internal diameter 230mm~250mm together with reducing agent II, when charging, the reducing agent I For semi-coke and metallurgical coke, catalyst is sodium sulphate and ferrous sulfate, and cosolvent is fluorite or borax；
The mass ratio of the compound powder of tinning are as follows: titanium-iron powder: sodium sulphate: ferrous sulfate: cosolvent: reducing agent I=100: (3~5): (3~5): (3~5): (5~7)；
The proportion of the reducing agent II: metallurgical coke: semi-coke: dolomite=(45~48): (40~45): 12；
Compound powder does not mix mutually with reducing agent II, and outermost layer is reducing agent II, and internal layer is solid compound powder, tinning Enter 138 meters of tunnel ovens afterwards to be restored, reduction temperature is 1100 DEG C~1300 DEG C, and the high temperature reduction time is 20 hours~25 small When, 300 DEG C are cooled back to hereinafter, kiln discharge unloads tank；
2, it is crushed, ore grinding, magnetic separation
Ilmenite after carrying out reduction is crushed to granularity≤20mm through jaw crusher, carries out ore grinding into one section of ball milling, and one Section -325 mesh >=40% of grinding particle size；Mineral aggregate is directly entered two sections of ball millings and regrinds after grinding out, and -325 mesh of secondary grinding granularity >= 65%；After secondary grinding, into a magnetic separation, magnetic field strength is 700GS~1000GS when a magnetic separation, is obtained after a magnetic separation The iron ore concentrate and TiO of TFe mass content >=80%2The titanium slag of mass content >=60%, titanium slag enter secondary magnetic separation, secondary magnetic separation When magnetic field strength be 1800GS~2000GS, obtain TiO after magnetic separation2The titanium slag of mass content >=70%, then through secondary magnetic separation Titanium slag enter last one of magnetic separation magnetic separation three times, three times when magnetic separation magnetic field strength be 3200GS~3500GS, after magnetic separation, obtain TiO2It is acid-soluble to obtain final products high-grade after filtering drying for the rich-titanium material of mass content 75%~80%, rich-titanium material Titanium slag.
Further, the mass ratio of semi-coke and metallurgical coke is 1:1~1:1.5 in the reducing agent I.
Further, the titanium-iron powder TFe grade 30%~35% that is obtained after sorting, TiO2Grade 40%~45%.
Further, charging is charged using the fire-resistant can of internal diameter 230mm, when charging, utilizes the mold of wall thickness 0.5mm tubbiness Fire-resistant can is divided into compound powder, the reducing agent II that two regions are sequentially loaded by center to inner edge, in fire-resistant can extremely by center It is the compound powder of 159mm, the reductant layer with a thickness of 35mm that inner edge, which sequentially forms diameter,.
Further, two fire-resistant cans are a column, and every column fills compound powder 25kg~30kg, and every column fills II 10kg of reducing agent ~15kg.
Further, the iron ore concentrate that a magnetic separation obtains obtains Gao Pin after shaking table further purifies iron ore concentrate drying Position TFe mass content >=90% Iron concentrate.
Further, granularity≤5mm of the reducing agent II.
" the reduction magnetic method " that the present invention uses, first by the southern exposure ilmenite of purification, reducing agent I, additive and catalysis Agent is uniformly mixed into compound powder by technique requirement.A mutual and unmixed laminar is loaded on fire-resistant can with reducing agent II again In, solid carbon reduction is carried out by tunnel oven, reducing material finally obtains rich-titanium material, its advantages through broken, ore grinding, magnetic separation Be: the acid-dissolved titanium slag produced using Chaoyang area ilmenite by " reduction magnetic method " can be reached by chemically examining indices Also having suitable MgO and FeO to national standard, and in titanium slag can increase in the process that next process sulfuric acid is acidified The reaction heat for adding titanium slag and sulfuric acid, reduces the usage amount of sulfuric acid, to ring at the problem of avoiding the shortage of heat in industrial acidolysis The pollution in border mitigates significantly.As this method of continuous improvement of titanium white industry demand amount is that one kind preferably produces acid-soluble titanium The method of slag.
Ilmenite after sorting, existence form are still titanium, iron ore association state, are sorted in conventional mechanical means Under mineral can not be separated.This method is (blue by solid reductant using the method for direct-reduction under given conditions Charcoal+metallurgical coke) and catalyst (sodium sulphate+ferrous sulfate) and cosolvent (fluorite/borax) iron oxide in miberal powder is restored Iron granule polymerization is set to grow up at metallic iron, and under the action of 1100 DEG C -1300 DEG C of additive (sodium sulphate, ferrous sulfate) Finally reaching titanium, iron can be with the necessary granularity of mechanical sorting.Metallic iron granularity gathers 50~100 μm with this condition, titanium ore It is still 20~30 μm there are granularity in the form of titanium dioxide.This method reaction time is short, low energy consumption, yield is big, and environmental protection, Product can be used as the quality raw materials of synthetic rutile and titanium dioxide.
Detailed description of the invention
Fig. 1 is the charging schematic diagram for the fire-resistant can that the present invention uses.
Specific embodiment
Embodiment 1
1, mixing, tinning, reduction
The titanium-iron powder (index is as shown in table 1) that ilmenite is obtained after sorting, 100kg titanium-iron powder and reducing agent I is blue Charcoal 3.5kg and metallurgical coke 3.5kg, catalyst sulfuric acid sodium 3kg and ferrous sulfate 5kg and cosolvent fluorite 3kg are sent into batch mixer It mixes, obtains compound powder；
Weigh metallurgical coke 45kg, semi-coke 45kg and dolomite 12kg be crushed to granularity≤5mm be uniformly mixed, obtain reducing agent Ⅱ；Compound powder and reducing agent II are fitted into fire-resistant can together；Charging is charged using the fire-resistant can of internal diameter 230mm, when charging, Using the mold of wall thickness 0.5mm tubbiness, fire-resistant can is divided into compound powder that two regions are sequentially loaded into, also by center to inner edge Former agent II sequentially forms compound powder that diameter is 159mm, by center to inner edge with a thickness of the reducing agent of 35mm in fire-resistant can Layer；Two fire-resistant cans are a column, and every column fills compound powder 25kg, and every column fills II 10kg of reducing agent；Extract the mould of the tubbiness Tool, is restored into 138 meters of tunnel ovens, and reduction temperature is 1100 DEG C~1150 DEG C, and the high temperature reduction time is 25 hours, herein Under the conditions of metallic iron granularity gather 50 μm~100 μm, titanium ore is still 20 μm~30 μm there are granularity in the form of titanium dioxide, 300 DEG C are cooled back to hereinafter, kiln discharge unloads tank after completing reduction；
2, it is crushed, ore grinding, magnetic separation
Ilmenite after carrying out reduction is crushed to granularity≤20mm through jaw crusher, carries out ore grinding into one section of ball milling, and one Section -325 mesh >=40% of grinding particle size；Mineral aggregate is directly entered two sections of ball millings and regrinds after grinding out, and -325 mesh of secondary grinding granularity >= 65%；After secondary grinding, into a magnetic separation, magnetic field strength is 700GS when a magnetic separation, obtains TFe mass after a magnetic separation The iron ore concentrate and TiO of content >=80%2The titanium slag of mass content >=60%, iron ore concentrate further purify iron ore concentrate baking by shaking table After dry, high-grade TFe mass content >=90% Iron concentrate is obtained；Titanium slag enters secondary magnetic separation, and magnetic field strength is when secondary magnetic separation 1800GS obtains TiO after magnetic separation2The titanium slag of mass content >=70%, the titanium slag then through secondary magnetic separation enter last one of magnetic Select magnetic separation three times, three times when magnetic separation magnetic field strength be 3200GS, after magnetic separation, obtain rich-titanium material, rich-titanium material after filtering drying, Final products high-grade acid-dissolved titanium slag is obtained, product index is as shown in table 3.
Embodiment 2
1, mixing, tinning, reduction
The titanium-iron powder (index is as shown in table 1) that ilmenite is obtained after sorting, 100kg titanium-iron powder and reducing agent I is blue Charcoal 2kg and metallurgical coke 3kg, catalyst sulfuric acid sodium 5kg and ferrous sulfate 3kg and cosolvent fluorite 5kg, which are sent into batch mixer, to be mixed, Obtain compound powder；
Weigh metallurgical coke 45kg, semi-coke 45kg and dolomite 12kg be crushed to granularity≤5mm be uniformly mixed, obtain reducing agent Ⅱ；Compound powder and reducing agent II are fitted into fire-resistant can together, charging is charged using the fire-resistant can of internal diameter 230mm, when charging, Fire-resistant can is divided into compound powder that two regions are sequentially loaded into, also by center to inner edge using the mold of wall thickness 0.5mm tubbiness Former agent II sequentially forms compound powder that diameter is 159mm, by center to inner edge with a thickness of the reducing agent of 35mm in fire-resistant can Layer；Two fire-resistant cans are a column, and every column fills compound powder 30kg, and every column fills II 15kg of reducing agent；Extract the mould of the tubbiness Tool, is restored into 138 meters of tunnel ovens, and reduction temperature is 1250 DEG C~1300 DEG C, and the high temperature reduction time is 20 hours, herein Under the conditions of metallic iron granularity gather 50 μm~100 μm, titanium ore is still 20 μm~30 μm there are granularity in the form of titanium dioxide, 300 DEG C are cooled back to hereinafter, kiln discharge unloads tank after completing reduction；
2, it is crushed, ore grinding, magnetic separation
Ilmenite after carrying out reduction is crushed to granularity≤20mm through jaw crusher, carries out ore grinding into one section of ball milling, and one Section -325 mesh >=40% of grinding particle size；Mineral aggregate is directly entered two sections of ball millings and regrinds after grinding out, and -325 mesh of secondary grinding granularity >= 65%；After secondary grinding, into a magnetic separation, magnetic field strength is 1000GS when a magnetic separation, obtains TFe mass after a magnetic separation The iron ore concentrate and TiO of content >=80%2The titanium slag of mass content >=60%, iron ore concentrate further purify iron ore concentrate baking by shaking table After dry, high-grade TFe mass content >=90% Iron concentrate is obtained.Titanium slag enters secondary magnetic separation, and magnetic field strength is when secondary magnetic separation 2000GS obtains TiO after magnetic separation2The titanium slag of mass content >=70%, the titanium slag then through secondary magnetic separation enter last one of magnetic Select magnetic separation three times, three times when magnetic separation magnetic field strength be 3500GS, after magnetic separation, obtain rich-titanium material, rich-titanium material after filtering drying, Final products high-grade acid-dissolved titanium slag is obtained, product index is as shown in table 3.
Embodiment 3
1, mixing, tinning, reduction
The titanium-iron powder (index is as shown in table 1) that ilmenite is obtained after sorting, 100kg titanium-iron powder and reducing agent I is blue Charcoal 2.5kg and metallurgical coke 3.5kg, catalyst sulfuric acid sodium 4kg and ferrous sulfate 4kg and cosolvent borax 4kg are sent into batch mixer It mixes, obtains compound powder；
Weigh metallurgical coke 45kg, semi-coke 45kg and dolomite 12kg be crushed to granularity≤5mm be uniformly mixed, obtain reducing agent Ⅱ；Compound powder and reducing agent II are fitted into fire-resistant can together, charging is charged using the fire-resistant can of internal diameter 230mm, when charging, Fire-resistant can is divided into compound powder that two regions are sequentially loaded into, also by center to inner edge using the mold of wall thickness 0.5mm tubbiness Former agent II, compound powder do not mix mutually with reducing agent II, and outermost layer is reducing agent II, and internal layer is solid compound powder, fire resisting Compound powder that diameter is 159mm is sequentially formed, with a thickness of the reductant layer of 35mm by center to inner edge in tank.Two fire-resistant cans For a column, every column fills compound powder 28kg, and every column fills II 12kg of reducing agent；The mold for extracting the tubbiness, into 138 meters of tunnels Road kiln is restored, and reduction temperature is 1180 DEG C~1200 DEG C, and the high temperature reduction time is 22 hours, with this condition metal abrasive grit Degree gathers 50 μm~100 μm, and titanium ore is still 20 μm~30 μm there are granularity in the form of titanium dioxide, completes cold again after restoring But to 300 DEG C hereinafter, kiln discharge unloads tank；
2, it is crushed, ore grinding, magnetic separation
Ilmenite after carrying out reduction is crushed to granularity≤20mm through jaw crusher, carries out ore grinding into one section of ball milling, and one Section -325 mesh >=40% of grinding particle size；Mineral aggregate is directly entered two sections of ball millings and regrinds after grinding out, and -325 mesh of secondary grinding granularity >= 65%；After secondary grinding, into a magnetic separation, magnetic field strength is 800GS when a magnetic separation, obtains TFe mass after a magnetic separation The iron ore concentrate and TiO of content >=80%2The titanium slag of mass content >=60%, iron ore concentrate further purify iron ore concentrate baking by shaking table After dry, high-grade TFe mass content >=90% Iron concentrate is obtained.Titanium slag enters secondary magnetic separation, and magnetic field strength is when secondary magnetic separation 1900GS obtains TiO after magnetic separation2The titanium slag of mass content >=70%, the titanium slag then through secondary magnetic separation enter last one of magnetic Select magnetic separation three times, three times when magnetic separation magnetic field strength be 3300GS, after magnetic separation, obtain rich-titanium material, rich-titanium material after filtering drying, Final products high-grade acid-dissolved titanium slag is obtained, product index is as shown in table 3.
Index (unit wt%) after the purification of 1 ilmenite of table
TFe TiO2 S P SiO2 CaO MgO Al2O3 MnO
Embodiment 1 32.86 44.88 0.025 0.018 3.56 1.21 5.96 2.25 0.63
Embodiment 2 33.56 43.96 0.028 0.015 3.02 1.12 5.41 2.02 0.61
Embodiment 3 34.25 44.98 0.026 0.016 2.85 1.08 5.11 1.88 0.59
2 acid-dissolved titanium slag national standard (unit wt%) of table
The acid-dissolved titanium slag index (unit wt%) of 3 1~embodiment of the embodiment of the present application 3 of table production
TiO2 TFe SiO2 Al2O3 CaO MgO Ti2O3 MFe P
Embodiment 1 76.21 6.54 4.72 3.0 1.6 7.9 20.57 1.50 0.01
Embodiment 2 78.65 5.35 4.2 2.8 1.56 7.52 21.14 1.35 0.01
Embodiment 3 79.70 4.90 4.02 2.65 1.52 7.20 21.50 1.20 0.01
Acid-dissolved titanium slag index produced by the invention meets acid-dissolved titanium slag national standard it can be seen from table 2 and table 3 National standard, and also have suitable MgO and FeO in titanium slag and can be greatly increased in the process that next process sulfuric acid is acidified The reaction heat of titanium slag and sulfuric acid, reduces the usage amount of sulfuric acid, to environment at the problem of avoiding the shortage of heat in industrial acidolysis Pollution mitigate significantly, product can be used as the quality raw materials of synthetic rutile and titanium dioxide.
The above is only specific embodiments of the present invention, are not intended to restrict the invention, for those skilled in the art For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification, Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (7)

1. a kind of method using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that:
Specific step is as follows:
1, mixing, tinning, reduction
The titanium-iron powder that ilmenite is obtained after sorting is sent into batch mixer after mixing with reducing agent I, catalyst and cosolvent, Compound powder is fitted into the fire-resistant can of internal diameter 230mm~250mm together with reducing agent II, when charging, the reducing agent I is orchid Charcoal and metallurgical coke, catalyst are sodium sulphate and ferrous sulfate, and cosolvent is fluorite or borax；
The mass ratio of the compound powder of tinning are as follows: titanium-iron powder: sodium sulphate: ferrous sulfate: cosolvent: I=100:(3 of reducing agent~ 5): (3~5): (3~5): (5~7)；
The proportion of the reducing agent II: metallurgical coke: semi-coke: dolomite=(45~48): (40~45): 12；
Compound powder does not mix mutually with reducing agent II, and outermost layer is reducing agent II, and internal layer is solid compound powder, and tinning is laggard Entering 138 meters of tunnel ovens to be restored, reduction temperature is 1100 DEG C~1300 DEG C, and the high temperature reduction time is 20 hours~25 hours, 300 DEG C are cooled back to hereinafter, kiln discharge unloads tank；
2, it is crushed, ore grinding, magnetic separation
Ilmenite after carrying out reduction is crushed to granularity≤20mm through jaw crusher, carries out ore grinding, one section of mill into one section of ball milling - 325 mesh >=40% of ore particle degree；Mineral aggregate is directly entered two sections of ball millings and regrinds after grinding out, -325 mesh >=65% of secondary grinding granularity；Two After section ore grinding, into a magnetic separation, magnetic field strength is 700GS~1000GS when a magnetic separation, obtains TFe mass after a magnetic separation The iron ore concentrate and TiO of content >=80%2The titanium slag of mass content >=60%, titanium slag enter secondary magnetic separation, secondary magnetic mass content Magnetic field strength is 1800GS~2000GS when selecting, and obtains TiO after magnetic separation2The titanium slag of mass content >=70%, then through secondary magnetic The titanium slag of choosing enters last one of magnetic separation magnetic separation three times, and magnetic field strength is 3200GS~3500GS when magnetic separation three times, after magnetic separation, obtains To TiO2It is molten to obtain final products high-grade acid after filtering drying for the rich-titanium material of mass content 75%~80%, rich-titanium material Property titanium slag.
2. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that: described go back The mass ratio of semi-coke and metallurgical coke is 1:1~1:1.5 in former agent I.
3. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that: through sorting The titanium-iron powder TFe grade 30~35% that obtains afterwards, TiO2Grade 40%~45%.
4. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that: charging is adopted It is charged with the fire-resistant can of internal diameter 230mm, when charging, using the mold of wall thickness 0.5mm tubbiness by fire-resistant can by center to interior fate The compound powder that is sequentially loaded at two regions, reducing agent II, sequentially forming diameter by center to inner edge in fire-resistant can is 159mm Compound powder, the reductant layer with a thickness of 35mm.
5. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that: two resistance to Cupping jar is a column, and every column fills compound powder 25kg~30kg, and every column fills II 10kg of reducing agent~15kg.
6. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag a, it is characterized in that: magnetic It selects the iron ore concentrate obtained after shaking table further purifies iron ore concentrate drying, obtains the Iron concentrate of high-grade TFe >=90%.
7. the method according to claim 1 using low-grade ilmenite production acid-dissolved titanium slag, it is characterized in that: described go back Granularity≤5mm of former agent II.
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