CN106929665A - A kind of system and method for processing high-iron bauxite - Google Patents
A kind of system and method for processing high-iron bauxite Download PDFInfo
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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
- C22B1/02—Roasting processes
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
- B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
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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
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
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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
- C22B21/00—Obtaining aluminium
- C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
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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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
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Abstract
The present invention relates to a kind of system and method for processing high-iron bauxite.The system includes pretreatment unit, reduction unit and fine grinding separative element.Pretreatment unit includes the high-iron bauxite powder outlet after high-iron bauxite raw ore entrance, preheating；Reduction unit includes fluid bed, and fluid bed includes the high-iron bauxite outlet of the high-iron bauxite powder entrance after preheating, reducing gas entrance, metallization, and the reducing gas entrance is arranged on the bottom of the fluid bed；Fine grinding separative element includes the high-iron bauxite entrance of metallization, metal iron powder outlet and rich aluminium slag outlet, and the high-iron bauxite entrance of the metallization is connected with the high-iron bauxite outlet of the metallization.The rich aluminium slag obtained by the system and method can finally be realized the harmful components for reducing metallic iron, reduce energy consumption and production cost, the effect of Simplified flowsheet as the raw material of production aluminum oxide, metal iron powder as steelmaking feed.
Description
Technical field
The present invention relates to gas base directly reducing production metallic iron field, more particularly to a kind of system for processing high-iron bauxite
And method.
Background technology
Bauxite is to produce topmost raw material in aluminum oxide at present, and more than 90% aluminum oxide is as original with bauxite
What material was produced.Bauxite resource enriches very much on world wide, is counted according to U.S. Bureau, world's alum clay ore reserves
It it is 26,800,000,000 tons, bauxite resource is widely distributed but Relatively centralized, and each continent is all distributed, but is distributed mainly on Guinea, bar
West, India, Australia and China.It is gibbsite type, alumina silica ratio high-quality bauxite high that external bauxite is most.
China is the relatively barren country of a bauxite resource, and reserves just correspond to world's per capita share to bauxite per capita
7.3%, and China's bauxite principally falls into silicon high, high ferro, indissoluble type bauxite, and high-quality alum clay ore reserves is less, high-quality
Bauxite resource shortage is one of significant challenge that China's aluminum oxide industry faces, according to National Development and Reform Committee predict, to the year two thousand twenty I
State's bauxite only has 27.1% for the degree of protection of reserves.Current China is the first big country of world's metallic aluminium yield and consumption.Closely
In the past few years, the expansion of China's aluminum oxide production capacity is swift and violent, and China's aluminum oxide yield in 2015 is up to 25,000,000 t according to statistics, but absolutely mostly
Several bauxite resource dependence on import, as bauxite demand gap is increasing, domestic bauxite supply is increasingly difficult to
To ensure；Therefore have to pay attention to the high-iron bauxite resource of low-quality.Swage bauxite high directly enters to be advanced into bayer process
When can produce substantial amounts of red mud, cause that the reduction of unit yield, energy consumption be excessive, the pollution drawback such as environment, how in bayer process
The preceding iron content reduction by high-iron bauxite turns into using high-iron bauxite problem demanding prompt solution.
The content of the invention
Above-mentioned technical problem is faced, the present invention is intended to provide a kind of system of use fluidized bed processing high-iron bauxite and side
Method separates ferro-aluminum, and the rich aluminium slag obtained by the system and method be able to can be made as the raw material of production aluminum oxide, metal iron powder
It is steelmaking feed, eventually arrives at the harmful components for reducing metallic iron, reduces energy consumption and production cost, the purpose of Simplified flowsheet.
To achieve the above object, the present invention proposes a kind of system for processing high-iron bauxite, and the system includes pre- place
Reason unit, reduction unit and fine grinding separative element, wherein,
The pretreatment unit includes the high-iron bauxite powder outlet after high-iron bauxite raw ore entrance, preheating；
The reduction unit includes fluid bed, and the fluid bed includes the high-iron bauxite powder entrance after preheating, also Primordial Qi
Body entrance, the high-iron bauxite outlet of metallization, the high ferro after high-iron bauxite powder entrance and the preheating after the preheating
Bauxite powder outlet is connected；
The fine grinding separative element includes that the high-iron bauxite entrance of metallization, metal iron powder outlet and rich aluminium slag go out
Mouthful, the high-iron bauxite entrance of the metallization is connected with the high-iron bauxite outlet of the metallization.
Specifically, the pretreatment unit includes that broken drying device is connected with preheating device order, wherein,
The broken drying device obtains ferrallite high for the broken, dry of the high-iron bauxite raw ore and again fine grinding
Miberal powder, the broken drying device is provided with the high-iron bauxite raw ore entrance；
The preheating device is provided with the outlet of the high-iron bauxite powder after the fuel gas inlet and the preheating, and combustion gas enters
The preheating device is used for the pre-heat treatment of the high-iron bauxite powder.
Further, the broken drying device includes that disintegrating machine, drying equipment are connected with fine grinding equipment order.
Further, the fine grinding separative element includes that fine grinding device is connected with physical separation means order.
Further, after the preheating high-iron bauxite powder entrance and the high-iron bauxite powder outlet after the preheating are logical
Cross tremie pipe connection.
Further, the reducing gas entrance is arranged on the bottom of the fluid bed.
The present invention also provides a kind of method for processing high-iron bauxite, including step,
A is pre-processed：In the pretreatment unit, high-iron bauxite raw ore is crushed, is dried, again fine grinding, preheating, obtain
High-iron bauxite powder after to preheating；
B gas-based reductions：In the fluid bed, the high-iron bauxite powder after the preheating is carried out into gas-based reduction and obtains metal
The high-iron bauxite of change；
C fine grindings are separated：In the fine grinding separative element, the high-iron bauxite to the metallization carries out fine grinding and physics point
From obtaining metal iron powder and rich aluminium slag.
Further, in step, by the high-iron bauxite crushing raw ore to below 3mm.
Preferably, in step, dried moisture control is below 2%.
Preferably, in step, by fine grinding again will be less than 100 mesh powder control account for whole raw materials 90% with
On.
Further, in step, high-iron bauxite powder is preheated to 700~950 DEG C.
Further, in stepb, by reduction reaction temperature control at 700~1050 DEG C, the reaction time 30~
100min。
Preferably, by the CO+H of the reducing gas for reducing2Volume ratio is controlled >=70%.
Further, before reduction reaction, reducing gas is preheated to 700~950 DEG C.
Further, in step C, the high-iron bauxite of the metallization is finely ground to less than 100 mesh.
Preferably, in step C, the method for the physical separation includes magnetic separation, flotation, gravity treatment.
Had the following advantages using technical solutions according to the invention：
(1) to the strong adaptability of raw material.High-iron bauxite is full Iron grade more than 20%, Al2O3Aluminium of the content more than 40%
Tu Kuang, compared to high-quality bauxite, such ore can greatly reduce single machine production during alumina producing Bayer process
Ability, increases energy consumption and can produce substantial amounts of red mud, therefore cannot be directly entered the flow of production aluminum oxide, it is necessary to carry out ore dressing
Except iron or other modes remove iron, by the Fe in ore2O3Being reduced in zone of reasonableness could enter the flow of production aluminum oxide.Together
When high-iron bauxite in the tight embedding cloth of ferro-aluminum, particle is superfine, causes the simple method by ore dressing to separate high-iron bauxite iron aluminium
It is difficult, while being economically also irrational.Alumina content is very high in high-iron bauxite, causes the fusing point of this ore deposit
It is very high, it is difficult to be smelted by way of blast furnace ironmaking.For the present invention, due to use gas-based reduction method,
Reduction temperature is relatively low, does not produce liquid phase, it is to avoid excessive energy consumption, and product is metallization miberal powder, Fe2O3It has been reduced into metal
Iron powder can be with Al2O3Relatively easily separate, while the composition of high-iron bauxite is not limited to, therefore using the side of gas-based reduction
Method processes high-iron bauxite, more advantageous, and the present invention is applied to all types of high-iron bauxites.
(2) due to using gas-based reduction, reaction temperature is low (700~1050 DEG C), far below usual blast furnace process or electric furnace process
About 1600 DEG C of temperature levels, therefore present invention process technology energy consumption is low, so as to reduce production cost.
(3) gaseous reducing agent is used, it is to avoid make reducing agent using coal or coke, therefore phosphorus sulfur content is far low in making metallic iron
In traditional blast furnace ironmaking flow.
(4) reduction degree of miberal powder be it is adjustable, adjusting method can by adjusting in reactor in also Primordial Qi composition, anti-
Temperature and reaction time is answered to carry out flexible modulation.
(5) when common iron ore concentrate is processed with fluidized bed process, because iron ore concentrate Iron grade is high, raw material after metallic iron is restored
It is susceptible to reunite and defluidization phenomenon occur, in order to prevent fluid bed defluidization from needing to add such as MgO or CaO antiplastering aids；But work as
During with fluidized bed processing high-iron bauxite, because high-iron bauxite Iron grade is relatively low and the more general Iron Ore Powder of fusing point is high, therefore also
Original is less prone to agglomeration after tapping a blast furnace.Therefore there is unique advantage using fluidized bed process treatment high-iron bauxite.
Additional aspect of the invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by practice of the invention.
Brief description of the drawings
Fig. 1 is the system schematic for the treatment of high-iron bauxite of the invention；
1- pretreatment units, 2- reduction units, 3- fine grinding separative elements；
11- crushes drying device, 12- preheating devices；111- disintegrating machines, 112- drying equipments, 113- fine grinding equipment, combustion gas
Entrance 121；Reducing gas entrance 21；31- fine grinding devices, 32- physical separation means.
Fig. 2 is the process chart for the treatment of high-iron bauxite of the invention.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the invention is described in more details, so as to energy
Enough more fully understand the advantage of the solution of the present invention and its various aspects.However, specific embodiments described below and implementation
Example is only descriptive purpose, rather than limitation of the present invention.
It is an object of the invention to provide the technique that a kind of high-iron bauxite separates ferro-aluminum resource, using fluid bed reduction high ferro
Bauxite powder, metal Iron concentrate and rich aluminium slag are isolated in magnetic separation after the high-iron bauxite powder of the metallization that will be obtained carries out fine grinding.
To achieve the above object, the present invention proposes a kind of system for processing high-iron bauxite, such as Fig. 1, the system bag
Pretreatment unit 1, reduction unit 2 and fine grinding separative element 3 are included, wherein,
The pretreatment unit 1 includes the high-iron bauxite powder outlet after high-iron bauxite raw ore entrance, preheating；
The reduction unit 2 includes fluid bed, and the fluid bed includes the high-iron bauxite powder entrance after preheating, also Primordial Qi
Body entrance, the high-iron bauxite outlet of metallization, the high ferro after high-iron bauxite powder entrance and the preheating after the preheating
Bauxite powder outlet is connected；
The fine grinding separative element 3 includes fine grinding device 31 and physical separation means 32, and the fine grinding separative element 3 includes
The high-iron bauxite entrance of metallization, metal iron powder are exported and rich aluminium slag outlet, the high-iron bauxite entrance of the metallization
It is connected with the high-iron bauxite outlet of the metallization.
Specifically, the pretreatment unit 1 includes that broken drying device 11 is connected with the order of preheating device 12, wherein,
The broken drying device 11 is provided with the high-iron bauxite raw ore entrance, and the broken drying device includes broken
Machine 111, drying equipment 112 and fine grinding equipment 113, high-iron bauxite enter in crusher in crushing, the high-iron bauxite for having crushed
Drying equipment is dried, and dried high-iron bauxite is carried out being finely ground to certain particle size and obtains ferrallite high into fine grinding equipment
Miberal powder；
The preheating device 12 is roaster, and it is provided with the high-iron bauxite powder after fuel gas inlet 121 and the preheating
Outlet, fuel gas enters the pre-heat treatment that the preheating device is used for the high-iron bauxite powder.
Further, after preheating under high-iron bauxite powder entrance and the high-iron bauxite powder outlet after the preheating pass through
Expects pipe is connected, and the high-iron bauxite powder after preheating is transported in reduction fluid bed through tremie pipe.
Further, the reducing gas entrance 21 is arranged on the bottom of the fluid bed, preheated in advance for being input into
Also Primordial Qi, reduction gas blowout fluidized bed in, high-iron bauxite miberal powder with reduction circulation of vital energy in the wrong direction stream so as to form fluidisation, make ferrallite high
Ferriferous oxide in ore deposit is reduced.
The present invention also provide it is a kind of process high-iron bauxite method, such as Fig. 2, the method comprising the steps of,
A pretreatments of raw material：In the pretreatment unit, high-iron bauxite raw ore is crushed, is dried, fine grinding, pre- again
Heat, the high-iron bauxite powder after being preheated；
B gas-based reductions：In the fluid bed, the high-iron bauxite powder after the preheating is carried out into gas-based reduction and obtains metal
The high-iron bauxite of change；
C fine grindings are separated：In the fine grinding separative element, the high-iron bauxite to the metallization carries out fine grinding and physics point
From obtaining metal iron powder and rich aluminium slag.
High-iron bauxite still can not directly using, it is necessary to carry out except iron treatment as a kind of ferro-aluminum grandidierite in the prior art
Just can apply to aluminum oxide industry.And the present invention uses fluid bed reduction --- the method for physical separation can be directly at it
Reason, enables the ferro-aluminum in high-iron bauxite to separate.At the same time, it is raw material high-iron bauxite to be used in fluid bed, is also removed from
The operation of addition such as MgO or CaO antiplastering aids.The product of technological process is metal iron powder and rich aluminium slag, and metal iron powder can use
In STEELMAKING PRODUCTION, rich aluminium slag can be used for alumina producing, and whole technological process will not produce other solid waste.
Further, in step, with disintegrating machine by the high-iron bauxite crushing raw ore to below 3mm.
Preferably, in step, dried moisture is controlled below 2% with drying equipment.
Preferably, in step, ground again with fine grinding equipment, whole originals will accounted for less than the control of the powder of 150 mesh
More than the 90% of material.
Further, the high-iron bauxite powder dried and after fine grinding is preheated in roaster, preheating furnace can be used
Gas heating, is preheated to 700~950 DEG C, and the high-iron bauxite powder after preheating is to be transported in reduction fluid bed through tremie pipe.
Further, in stepb, by reduction reaction temperature control at 700~1050 DEG C, the reaction time 30~
100min.Using containing CO+H in reduction fluid bed2The also Primordial Qi of >=70% volume ratio is carried out to high-iron bauxite agglomerates
Reduction, obtains high-iron bauxite metallization miberal powder, and caking inhibiter need not be added in reduction process.Wherein, fluid bed reduction gas thing
First it is preheated, temperature reaches 700~950 DEG C after preheating, then by bottom spray into fluid bed in, high-iron bauxite miberal powder with reduction
Circulation of vital energy in the wrong direction stream is reduced the ferriferous oxide in high-iron bauxite so as to form fluidisation.
Further, in step C, the high-iron bauxite of the metallization that will be obtained after reduction is finely ground to less than 100
Mesh.Then physical separation is carried out, containing metal iron powder and rich aluminium slag is obtained, metal iron powder can be used for direct steelmaking, can also be pressed into gold
Category iron powder briquetting is stored, and the rich aluminium slag after deferrization can enter Bayer process flow oxygenerating aluminium.The method of physical separation can be with
It is magnetic separation, flotation, the slag separation method such as gravity treatment.
Below, according to technological process of the invention, select four kinds of high-iron bauxites of heterogeneity, produce rich aluminium slag and
Metal iron powder, specific embodiment is as follows：
Embodiment 1
The high-iron bauxite composition that the present embodiment is used is shown in Table 1.1.
The main chemical compositions (wt%) of 1.1 high-iron bauxites 1
| Composition | TFe | Al2O3 | SiO2 | TiO2 | CaO | MgO | Na2O+K2O | P2O5 |
| Content/wt100% | 25.84 | 36.26 | 10.96 | 7.46 | 4.94 | 0.16 | 2.52 | 0.167 |
After high-iron bauxite is dried into broken and fine grinding, fine mill size accounts for the 95% of whole raw materials, preheating less than 100 purposes
850 DEG C are preheating in stove, grace producer gas (62%H is used in reduction fluid bed2, 8.6%CO, 2%CO2, 27.4%N2) right
High-iron bauxite is reduced, and at about 850 DEG C, the reaction time is 100min to reduction temperature.By the high-iron bauxite powder after reduction
Then fine grinding carries out magnetic separation separation to less than 200 mesh, and the metal iron powder composition for obtaining is shown in Table 1.2 and is shown in Table with the composition of rich aluminium slag
1.3。
The main component (wt%) of the metal iron powder 1 of table 1.2
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 93.51 | 3.54 | 1.12 | 0.81 | 0.43 | 0.02 |
The main component (wt%) of the rich aluminium slag 1 of table 1.3
Embodiment 2
The high-iron bauxite composition that the present embodiment is used is shown in Table 2.1.
The main chemical compositions (wt%) of the high-iron bauxite 2 of table 2.1
| Composition | TFe | Al2O3 | SiO2 | TiO2 | CaO | MgO | Na2O+K2O | P2O5 |
| Content/wt100% | 22.64 | 41.28 | 9.93 | 8.26 | 4.32 | 1.2 | 1.45 | 0.11 |
After high-iron bauxite is dried into broken and fine grinding, fine mill size accounts for the 95% of whole raw materials, preheating less than 100 purposes
800 DEG C are preheating in stove, coke-stove gas (45.8%CO+48.2%H is used in reduction fluid bed2+ 2.3%CO2+ 3.7%N2)
High-iron bauxite is reduced, at about 900 DEG C, the reaction time is 60min to reduction temperature.By the high-iron bauxite powder after reduction
Then fine grinding carries out magnetic separation separation to less than 200 mesh, and the metal iron powder composition for obtaining is shown in Table 2.2 and is shown in Table with the composition of rich aluminium slag
2.3。
The main component (wt%) of the metal iron powder 2 of table 2.2
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 90.31 | 5.06 | 2.64 | 1.14 | 0.67 | 0.03 |
The main component (wt%) of the rich aluminium slag 2 of table 2.3
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 7.68 | 52.46 | 11.84 | 10.26 | 7.59 | 2.06 |
Embodiment 3
The high-iron bauxite composition that the present embodiment is used is shown in Table 3.1.
The main chemical compositions (wt%) of the high-iron bauxite 3 of table 3.1
| Composition | TFe | Al2O3 | SiO2 | TiO2 | CaO | MgO | Na2O+K2O | P2O5 |
| Content/wt100% | 23.47 | 39.26 | 11.63 | 6.68 | 5.14 | 0.18 | 1.35 | 0.18 |
After high-iron bauxite is dried into broken and fine grinding, fine mill size accounts for the 95% of whole raw materials, preheating less than 100 purposes
750 DEG C are preheating in stove, grace producer gas (35.1%CO+41.4%H is used in reduction fluid bed2+ 2.3%CO2+ 21.2%
N2) high-iron bauxite is reduced, at about 1050 DEG C, the reaction time is 30min to reduction temperature.Ferrallite high after by reduction
Then miberal powder fine grinding carries out magnetic separation separation to less than 100 mesh, and the metal iron powder composition for obtaining is shown in Table 3.2 and richness
The composition of aluminium slag is shown in Table 3.3.
The main component (wt%) of the metal iron powder 3 of table 3.2
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 88.79 | 5.07 | 2.14 | 1.23 | 0.78 | 0.04 |
The main component (wt%) of the rich aluminium slag 3 of table 3.3
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 9.46 | 51.54 | 13.06 | 11.20 | 7.06 | 1.81 |
Embodiment 4
The high-iron bauxite composition that the present embodiment is used is shown in Table 4.1.
The main chemical compositions (wt%) of the high-iron bauxite 4 of table 4.1
| Composition | TFe | Al2O3 | SiO2 | TiO2 | CaO | MgO | Na2O+K2O | P2O5 |
| Content/wt100% | 22.33 | 41.77 | 8.26 | 8.15 | 4.01 | 1.27 | 1.48 | 0.12 |
After high-iron bauxite is dried into broken and fine grinding, fine mill size accounts for the 95% of whole raw materials, preheating less than 100 purposes
950 DEG C are preheating in stove, coke-stove gas (40.8%CO+47.1%H is used in reduction fluid bed2+ 2.9%CO2+ 9.2%N2)
High-iron bauxite is reduced, at about 700 DEG C, the reaction time is 90min to reduction temperature.By the high-iron bauxite powder after reduction
Then fine grinding carries out magnetic separation separation to less than 200 mesh, and the metal iron powder composition for obtaining is shown in Table 4.2 and is shown in Table with the composition of rich aluminium slag
4.3。
The main component (wt%) of the metal iron powder 4 of table 4.2
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 88.31 | 6.01 | 2.45 | 1.13 | 0.61 | 0.03 |
The main component (wt%) of the rich aluminium slag 4 of table 4.3
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 7.52 | 52.01 | 11.66 | 10.17 | 7.5 | 2.12 |
The technical scheme provided in above-described embodiment to the strong adaptability of raw material, for full Iron grade more than 20%, Al2O3
High-iron bauxite of the content more than 40%, using the method for gas-based reduction, not only avoids making reducing agent using coal or coke, reduces
The harmful components of metallic iron, and reduction temperature is far below the temperature levels of about 1600 DEG C of usual blast furnace process or electric furnace process, does not produce
Raw liquid phase, therefore excessive energy consumption is avoided, the operation of addition such as MgO or CaO antiplastering aids is also eliminated in addition.What is obtained is anti-
It is metallization miberal powder, Fe to answer product2O3Being reduced into metal iron powder can be with Al2O3Relatively easily separate, whole technique stream
Cheng Buhui produces other solid waste.The metal iron powder taste for finally giving is high, reaches more than 88%, can be used to make steel life
Produce；Al in rich aluminium slag2O3More than 51% is reached, can be used for alumina producing.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and simultaneously
The non-restriction to implementation method.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (10)
1. it is a kind of process high-iron bauxite system, the system include pretreatment unit, reduction unit and fine grinding separative element,
Wherein,
The pretreatment unit includes the high-iron bauxite powder outlet after high-iron bauxite raw ore entrance, preheating；
The reduction unit includes fluid bed, and the fluid bed includes that the high-iron bauxite powder entrance after preheating, reducing gas enter
Mouth, the high-iron bauxite outlet of metallization, the ferrallite high after high-iron bauxite powder entrance and the preheating after the preheating
Miberal powder outlet is connected, and the reducing gas entrance is arranged on the bottom of the fluid bed；
The fine grinding separative element includes the high-iron bauxite entrance of metallization, metal iron powder outlet and rich aluminium slag outlet, institute
The high-iron bauxite entrance of metallization is stated to be connected with the high-iron bauxite outlet of the metallization.
2. system according to claim 1, it is characterised in that the pretreatment unit includes broken drying device and preheating
Device sequence is connected, wherein,
The broken drying device is provided with the high-iron bauxite raw ore entrance；
The preheating device is provided with the outlet of the high-iron bauxite powder after fuel gas inlet and the preheating.
3. system according to claim 2, it is characterised in that
The broken drying device includes that disintegrating machine, drying equipment are connected with fine grinding equipment order；
The fine grinding separative element includes that fine grinding device is connected with physical separation means order.
4. system according to claim 1, it is characterised in that high-iron bauxite powder entrance after the preheating and described pre-
High-iron bauxite powder outlet after heat is connected by tremie pipe.
5. the method that system described in a kind of use claim 1 processes high-iron bauxite, including step,
A is pre-processed：In the pretreatment unit, high-iron bauxite raw ore is crushed, is dried, again fine grinding, preheating, obtain pre-
High-iron bauxite powder after heat；
B gas-based reductions：In the fluid bed, the high-iron bauxite powder after the preheating is carried out what gas-based reduction was metallized
High-iron bauxite；
C fine grindings are separated：In the fine grinding separative element, fine grinding is carried out to the high-iron bauxite of the metallization and physical separation is obtained
To metal iron powder and rich aluminium slag.
6. method according to claim 5, it is characterised in that in step, the high-iron bauxite crushing raw ore is arrived
Below 3mm.
7. method according to claim 5, it is characterised in that in step, by the control of dried moisture 2% with
Under.
8. method according to claim 5, it is characterised in that in stepb, by reduction reaction temperature control 700~
1050 DEG C, 30~100min of reaction time.
9. method according to claim 5, it is characterised in that before the reduction reaction of step B, will be used for the reduction for reducing
Gas is preheated to 700~950 DEG C.
10. method according to claim 5, it is characterised in that in step C, by the high-iron bauxite of the metallization
It is finely ground to less than 100 mesh, the method for the physical separation includes magnetic separation, flotation, gravity treatment.
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| CN110510646A (en) * | 2019-09-25 | 2019-11-29 | 东北大学 | High-iron bauxite suspended state prereduction-electro-smelting separation and recovery iron aluminium method |
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