CN110066915A - A kind of method that calcining magnetic separation removes phosphorus in high-phosphor oolitic hematite - Google Patents
A kind of method that calcining magnetic separation removes phosphorus in high-phosphor oolitic hematite Download PDFInfo
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- CN110066915A CN110066915A CN201910340027.8A CN201910340027A CN110066915A CN 110066915 A CN110066915 A CN 110066915A CN 201910340027 A CN201910340027 A CN 201910340027A CN 110066915 A CN110066915 A CN 110066915A
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- oolitic hematite
- magnetic separation
- phosphorus
- mixture
- calcining
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- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052595 hematite Inorganic materials 0.000 title claims abstract description 59
- 239000011019 hematite Substances 0.000 title claims abstract description 59
- 239000011574 phosphorus Substances 0.000 title claims abstract description 46
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 46
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 33
- 238000001354 calcination Methods 0.000 title claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 91
- 229910052742 iron Inorganic materials 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 23
- 239000012141 concentrate Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 7
- 239000002817 coal dust Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 3
- 238000006722 reduction reaction Methods 0.000 abstract description 22
- 230000008569 process Effects 0.000 abstract description 11
- 239000003795 chemical substances by application Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000005469 granulation Methods 0.000 abstract 1
- 230000003179 granulation Effects 0.000 abstract 1
- 230000009467 reduction Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000007790 solid phase Substances 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910001919 chlorite Inorganic materials 0.000 description 3
- 229910052619 chlorite group Inorganic materials 0.000 description 3
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 241000761557 Lamina Species 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052585 phosphate mineral Inorganic materials 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- 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
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
-
- 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
- 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
- C22B1/02—Roasting processes
-
- 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
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
Abstract
The invention discloses the methods of phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite, this method forms the ratio of mixture by optimization, the basicity of mixture including oolitic hematite is 0.8-1.2, for following reduction reaction can high efficiency dephosphorating lay the foundation, in mixture of the invention on the basis of limiting basicity, the type of removing P elements raw material is optimized simultaneously, silicon calcium powder and lime are changed by traditional Dephosphorising agent, on the one hand it can reduce the cost of raw material, on the other hand pollution caused by Dephosphorising agent capable of being reduced during restoring oolitic hematite；At the same time, because the basicity of adjustment mixture, improves the dephosphorization rate of reduction reaction, reduce the processes such as briquetting, the granulation in conventional dephosphorization, simplify technique, reduces dephosphorization cost, present invention process process is simple, economic cost is lower, strong operability, significant to oolitic hematite dephosphorization effect.
Description
[technical field]
The present invention relates to high-phosphor oolitic hematite dephosphorizing technology field, especially a kind of efficiently removal high-phosphor oolitic hematite
The method of middle phosphorus.
[background technique]
China is very huge as a resource big country iron ore reserves, but grade is lower and refractory iron ore occupies
More, high-phosphor oolitic hematite is a kind of very huge iron ore resource of storage capacity for China, while being also to be most difficult to select
One of high-phosphorus iron ore, the total resource of oolitic hematite accounts for 11% or so of China's iron ore deposit, its structure is with roe shape
Or spherical shape, the ellipse of oolith, and have corresponding concentric lamina, therefore it is named as oolitic hematite.
The structure majority of high-phosphorus hematite is oolitic texture, also includes Ningxiang's formula oolitic hematite, declares the red iron of imperial formula roe shape
Mine.Mainly based on bloodstone, limonite and siderite, wherein the main component of gangue Minerals is chlorite and quartz etc.,
And the content part of phosphorus with the concentric structure of roe shape or oolith presence, their symbiotic form be all often and clay, quartz,
There are symbiosis in cementing form for the gangue minerals such as chlorite.
The disseminated grain size of oolitic hematite is very tiny, and the content of phosphorus accounts for mainly in collophane and chlorite, wherein phosphorus
Content be usually both greater than 1%, part even both greater than 3%, the content of phosphorus is too high in these roe shape ores, is not able to satisfy steel
Standard of the iron enterprise to phosphorus content.High-phosphor oolitic hematite is considered as being most difficult to the iron ore of choosing both at home and abroad for the whole world
Type, roe shape are divided into two parts, are roe body and roe core respectively.The type of roe core is wherein divided into three types, bloodstone,
Quartz particles and broken oolith.Roe body is then different gangue and mineral, such as different types of iron ore and quartz mineral
Matter, the structure inside roe body are all package roe core from level to level, and which forms the ellipse of concentric lamina and circular ooliths.Oolith
Diameter generally in 1~2mm, also have lesser diameter in several microns, the number of rings of their concentric lamina is all ten to two
Between ten, the arrangement of some laminas is very well-balanced, and the arrangement of some laminas is then uneven, results in being mingled with very in roe shape in this way
More objectionable impurities, these impurity are not only wrapped in the inside of roe core, but also are mixed among oolith, so oolitic hematite
Ore dressing difficulty with regard to highly difficult, if by oolitic hematite be broken into it is powdered can also be easy silt, deal with so more
Add difficulty, and thinner by broken oolitic hematite granularity, accepts time-consuming and laborious, cost nature last time in iron and steel enterprise
It increases very much, these different factors, which result in oolitic hematite, can not be mass produced utilization, generally can not directly make
It is directly used for the raw material of iron and steel enterprise, therefore such iron ore is used now substantially free from by exploitation.
There are 3,000,000,000 tons of high-phosphor oolitic hematites in China, and this iron ore contains P high (0.5-1.0%), grade lower (35-
50%).Iron oxide crystal grain disseminated grain size is thin (1-5um), and it is extremely difficult to sort separation, thus does not obtain effectively exploiting and utilize.This
The preservation in the form of collophane of the phosphorus in iron ore is planted, and mixed in together with the chamosite rich in iron oxide, is formed concentric
The alternate oolith structure of stratiform, oolitic hematite stone are one of the iron ore types for being most difficult to select generally acknowledged both at home and abroad at present.
In consideration of it, someone starts to study the phosphorus removing in oolitic hematite again in the prior art, such as invent
Patent, mostly, by suitable ratio progress ingredient, pressed using by high-phosphor oolitic hematite powder and coal dust, Dephosphorising agent and bonding agent
Ball, reduction treatment are that Dephosphorising agent is added to realize, so that the phosphorus content in concentrate is reduced to during ingredient
0.1% hereinafter, still, these technologies cause the cost to high-phosphor oolitic hematite processing to increase by the way that Dephosphorising agent is added, into
And the serious quality for affecting iron ore concentrate.
[summary of the invention]
It is an object of the invention to overcome the above-mentioned prior art, a kind of efficiently removal high-phosphor oolitic hematite is provided
The method of middle phosphorus.The method of phosphorus in efficient removal high-phosphor oolitic hematite according to the present invention, process flow is simple, it is economical at
This lower, strong operability is significant to oolitic hematite dephosphorization effect.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of method that calcining magnetic separation removes phosphorus in high-phosphor oolitic hematite, comprising the following steps:
Step 1, ball milling oolitic hematite；
Step 2, the oolitic hematite after silicon calcium powder, reducing agent, lime and ball milling is mixed, forming basicity is 0.8-1.2's
Mixture, the grain graininess < 5mm in mixture；
Step 3, mixture obtains roasting material after dephosphorization under reducing atmosphere reaction occurs；
Step 4, the iron ore concentrate after finally removing phosphorus is obtained after roasting material cooling, grinding by magnetic separation.
A further improvement of the present invention is that:
Preferably, in step 1, it is 160-200 mesh that oolitic hematite, which is milled to its granularity,.
Preferably, in step 2, oolitic hematite, 3-5 part silicon calcium powders, 8-15 part of the mixing quality proportion for 90-100 parts
6-10 parts of reducing agent, lime form mixture.
Preferably, in step 2, reducing agent is coal dust.
Preferably, in step 2, the mixing of oolitic hematite is divided into two steps after silicon calcium powder, reducing agent, lime and ball milling:
One step, stirs and evenly mixs；Second step adds water to mix, and the water of addition accounts for the 8% of final mixture quality.
Preferably, in step 3, mixture carries out dephosphorization under reducing atmosphere reaction in high temperature box type resistance furnace.
Preferably, in step 3, dephosphorization under reducing atmosphere reaction temperature is 1050 DEG C -1200 DEG C, and the dephosphorization under reducing atmosphere time is 60-
90min。
Preferably, in step 4, after roasting material is cooling, 200 mesh is ground to and carry out magnetic separation.
Preferably, in step 4, the magnetic field strength of magnetic separation is 800-1200GS.
Preferably, in step 4, the magnetic field strength of magnetic separation is 800-1000GS.
Compared with prior art, the invention has the following advantages:
The invention discloses the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite, this method passes through optimization shape
At the ratio of mixture, the basicity of the mixture including oolitic hematite is 0.8-1.2, is that following reduction reaction can
High efficiency dephosphorating lays the foundation, and in mixture of the invention on the basis of limiting basicity, while optimizing removing P elements raw material
Type, silicon calcium powder and lime are changed by traditional Dephosphorising agent, on the one hand can reduce the cost of raw material, another aspect energy
It is polluted caused by Dephosphorising agent is enough reduced during restoring oolitic hematite；At the same time, because of the basicity of adjustment mixture,
The grain graininess of mixture is smaller simultaneously, can be improved the dephosphorization rate of reduction reaction, reduces the briquetting in conventional dephosphorization, is granulated
Etc. processes, simplify technique, reduce dephosphorization cost, present invention process process is simple, and economic cost is lower, strong operability, right
Oolitic hematite dephosphorization effect is significant.
Further, the granularity of ball milling oolitic hematite to oolitic hematite is 160-200 mesh, is subsequent mixing, also
Original reaction is prepared.
Further, limitation mixing quality proportion, adjusts the content of each ingredient, so that final mixture in the range
Basicity can be within the scope of target component.
Further, reducing agent is preferably coal dust, and cost is relatively low while playing reduction for coal dust.
Further, the mixing of mixture is divided into two parts, on the basis of the first step is stirred, water is added to mix, into
One step mixes mixture, can form the mixture of grain graininess < 5mm.
Further, dephosphorization under reducing atmosphere reaction need to carry out at an elevated temperature in high temperature box type resistance furnace.
Further, the temperature and time of limitation dephosphorization under reducing atmosphere reaction, guarantees to reach certain dephosphorization rate, the present invention
In because dephosphorization mixture configuration so that the dephosphorization temperature of reduction process is lower, production cost is reduced；Simultaneously in the time model
Enclose interior generation dephosphorisation reaction so that the dephosphorization rate of oolitic hematite can be met the requirements, will not because soaking time is too long and
Increase cost, the final roasting material for obtaining solid-like.
Further, roasting material is ground to 200 mesh before magnetic separation, is separated so that iron ore concentrate takes a step forward with phosphorus in magnetic separation.
Further, for essence iron ore made from this method, the magnetic field strength of magnetic separation is limited, magnetic field strength is excessive, easily
Come up in by the P absorption in smart iron ore, magnetic field strength is too small, and the iron content for absorbing iron ore is too low, and recovery rate is relatively low, and cost adds
Greatly.
[Detailed description of the invention]
Fig. 1 is flow chart of the invention.
[specific embodiment]
The present invention will be further described combined with specific embodiments below:
The invention discloses a kind of methods of phosphorus in efficiently removal high-phosphor oolitic hematite, referring to Fig. 1, this method include with
Lower step:
(1) oolitic hematite is milled to the granularity of 160-200 mesh, the quality hundred of the P elements in the oolitic hematite
Dividing content is 0.5-1.0%, grade 35-50%.
(2) it is according to quality proportioning with reducing agent, silicon calcium powder and lime by the oolitic hematite that ore grinding obtains in step (1)
90-100 parts of oolitic hematites, 3-5 parts of silicon calcium powders, 8-15 parts of reducing agents, 6-10 parts of lime form primary mixture, described to go back
Former agent is preferably lower-cost coal dust；Gradually water is added to carry out secondary mixing simultaneously in uniformly mixed primary mixture, and
Controlling mixture final moisture is 8%., so that mixture is further uniform, and granularity < 5mm is capable of forming in mixed process
Hybrid particles (this process is different from traditional pelletization, only by the mixing vessel rolled, such as roller blender so that
The electrostatic interaction of mixture and water droplet forms little particle, so that mixing is more uniformly, so that can in following reduction reaction
Can react at a lower temperature, and reaction efficiency is high), to form final mixture, by adjusting the ratio of each substance,
So that the basicity of the final mixture formed is 0.8-1.2,.
(3) heating reduction reaction is carried out in high temperature box type resistance furnace, heating is heated to 1050 DEG C -1200 DEG C, existing skill
In art, remove bloodstone in P elements 1300 DEG C of the usual > of reduction temperature, the present invention in because dephosphorization mixture configuration, make
The dephosphorization temperature for obtaining reduction process is lower, and production cost reduces；Heating reduction handles time 60-90min, within this time range
The dephosphorization rate of oolitic hematite can be met the requirements, and will not be increased cost because soaking time is too long, finally be obtained solid
The roasting material of shape.
When material basicity is less than 1, Phosphate minerals therein carry out reduction reaction as the following formula:
2Ca5(PO4)3F+15C+9SiO2=3/2P4+15CO+9CaO·SiO2+CaF2
When material basicity is greater than 1, Phosphate minerals therein carry out reduction reaction as the following formula:
2Ca5(PO4)3F+15C=3/2P4+15CO+9CaO+CaF2
(4) roasting material obtained in step (3) is taken out from high temperature box type resistance furnace, cooled to room temperature is finely ground to
200 mesh；
(5) by magnetic separation, solid phase is collected, iron ore concentrate, magnetic field strength 800-1200GS are obtained, it is preferred that the intensity is
800-1000GS, the iron ore concentrate after obtaining removing phosphorus；Roasting material is milled to 200 mesh hereinafter, making iron by (4) step and (5) step
Concentrate is further separated with phosphorus composition, then passes through magnetic separation process, isolated iron ore concentrate,.
In the above process, the addition of Dephosphorising agent obtains significant dephosphorization effect, and for dephosphorization effect 90% or more, iron is smart
Phosphorus content is down to 0.1% or less in mine.
Below by specific embodiment, the present invention will be further elaborated:
Embodiment
Embodiment 1
The red iron ball of roe shape is milled to 160 mesh, with addition of 3 parts of silicon calcium powders, 10 parts of lime, 8 parts of coal dusts and 90 parts of oolitic hematites,
Water is added after mixing, water accounts for the 8% of mixture quality, with basicity 0.8 mixture, final mixture is placed in
Heating reduction reaction is carried out in high temperature box type resistance furnace, is heated to 1200 DEG C, reduction treatment 60min, is obtained roasting material, will be roasted
Material is cooling to be finely ground to 200 mesh, carries out magnetic separation, and magnetic field strength 800GS collects solid phase, obtains iron ore concentrate.Raw ore in the embodiment
Phosphorus content is 0.97%, and phosphorus content is 0.087% in iron ore concentrate.
Embodiment 2
The red iron ball of roe shape is milled to 200 mesh, with addition of 5 parts of silicon calcium powders, 6 parts of lime, 15 parts of coal dusts and 100 parts of red iron of roe shape
Water is added in mine after mixing, and water accounts for the 8% of mixture quality, with basicity 1.2 mixture, final mixture is put
It is placed in progress heating reduction reaction in high temperature box type resistance furnace, is heated to 1050 DEG C, reduction treatment 90min, obtains roasting material, it will
Roasting material is cooling to be finely ground to 200 mesh, carries out magnetic separation, and magnetic field strength 1200GS collects solid phase, obtains iron ore concentrate.Raw ore phosphorus contains
Amount is 0.97%, and phosphorus content is 0.066% in iron ore concentrate.
Embodiment 3
The red iron ball of roe shape is milled to 180 mesh, with addition of 4 parts of silicon calcium powders, 8 parts of lime, 10 parts of coal dusts and 95 parts of oolitic hematites,
Water is added after mixing, water accounts for the 8% of mixture quality, with basicity 1.0 mixture, final mixture is placed in
Heating reduction reaction is carried out in high temperature box type resistance furnace, is heated to 1100 DEG C, reduction treatment 80min, is obtained roasting material, will be roasted
Material is cooling to be finely ground to 200 mesh, carries out magnetic separation, and magnetic field strength 1000GS collects solid phase, obtains iron ore concentrate, raw ore phosphorus content is
0.97%, phosphorus content is 0.056% in iron ore concentrate.
Embodiment 4
The red iron ball of roe shape is milled to 180 mesh, with addition of 4 parts of silicon calcium powders, 9 parts of lime, 10 parts of coal dusts and 95 parts of oolitic hematites,
Water is added after mixing, water accounts for the 8% of mixture quality, with basicity 1.2 mixture, final mixture is placed in
Heating reduction reaction is carried out in high temperature box type resistance furnace, is heated to 1150 DEG C, reduction treatment 90min, is obtained roasting material, will be roasted
Material is cooling to be finely ground to 200 mesh, carries out magnetic separation, and magnetic field strength 1000GS collects solid phase, obtains iron ore concentrate, raw ore phosphorus content is
0.97%, phosphorus content is 0.073% in iron ore concentrate.
Embodiment 5
The red iron ball of roe shape is milled to 180 mesh, with addition of 5 parts of silicon calcium powders, 6 parts of lime, 10 parts of coal dusts and 90 parts of oolitic hematites,
Water is added after mixing, water accounts for the 8% of mixture quality, with basicity 0.8 mixture, final mixture is placed in
Heating reduction reaction is carried out in high temperature box type resistance furnace, is heated to 1150 DEG C, reduction treatment 90min, is obtained roasting material, will be roasted
Material is cooling to be finely ground to 200 mesh, carries out magnetic separation, and magnetic field strength 800GS collects solid phase, obtains iron ore concentrate, raw ore phosphorus content is
0.97%, phosphorus content is 0.094% in iron ore concentrate.
Iron content and phosphorus content in iron ore after each embodiment dephosphorization of table 1
| Number | Raw ore contains P/% | Original sample TFe/% | Concentrate TFe/% | Concentrate P/% | Dephosphorization rate/% |
| Embodiment 1 | 0.97 | 46.88 | 69.81 | 0.087 | 91.03% |
| Embodiment 2 | 0.97 | 46.88 | 69.24 | 0.066 | 93.2% |
| Embodiment 3 | 0.97 | 46.88 | 59.2 | 0.056 | 94.2% |
| Embodiment 4 | 0.97 | 46.88 | 64.98 | 0.073 | 92.5% |
| Embodiment 5 | 0.97 | 46.88 | 74.71 | 0.094 | 90.3% |
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method of phosphorus in calcining magnetic separation removal high-phosphor oolitic hematite, which comprises the following steps:
Step 1, ball milling oolitic hematite；
Step 2, the oolitic hematite after silicon calcium powder, reducing agent, lime and ball milling is mixed, the mixing that basicity is 0.8-1.2 is formed
Object, the grain graininess < 5mm in mixture；
Step 3, mixture obtains roasting material after dephosphorization under reducing atmosphere reaction occurs；
Step 4, the iron ore concentrate after finally removing phosphorus is obtained after roasting material cooling, grinding by magnetic separation.
2. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 1, it is 160-200 mesh that oolitic hematite, which is milled to its granularity,.
3. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 2, oolitic hematite, 3-5 part silicon calcium powders, 8-15 part reducing agents, lime 6-10 of the mixing quality proportion for 90-100 parts
Part, form mixture.
4. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 2, reducing agent is coal dust.
5. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 2, the mixing of oolitic hematite is divided into two steps after silicon calcium powder, reducing agent, lime and ball milling: the first step is stirred and evenly mixed；The
Two steps, add water to mix, and the water of addition accounts for the 8% of final mixture quality.
6. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 3, mixture carries out dephosphorization under reducing atmosphere reaction in high temperature box type resistance furnace.
7. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 6, which is characterized in that
In step 3, dephosphorization under reducing atmosphere reaction temperature is 1050 DEG C -1200 DEG C, and the dephosphorization under reducing atmosphere time is 60-90min.
8. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 4, after roasting material is cooling, it is ground to 200 mesh and carries out magnetic separation.
9. the method for phosphorus in a kind of calcining magnetic separation removal high-phosphor oolitic hematite according to claim 1, which is characterized in that
In step 4, the magnetic field strength of magnetic separation is 800-1200GS.
10. the method that calcining magnetic separation described in -9 any one removes phosphorus in high-phosphor oolitic hematite according to claim 1, special
Sign is, in step 4, the magnetic field strength of magnetic separation is 800-1000GS.
Priority Applications (1)
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