CN206607284U - A kind of system for handling high-iron bauxite - Google Patents
A kind of system for handling high-iron bauxite Download PDFInfo
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- CN206607284U CN206607284U CN201720245494.9U CN201720245494U CN206607284U CN 206607284 U CN206607284 U CN 206607284U CN 201720245494 U CN201720245494 U CN 201720245494U CN 206607284 U CN206607284 U CN 206607284U
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Abstract
The utility model is related to a kind of system for handling 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 powder entrance after preheating, reducing gas entrance, the high-iron bauxite outlet of 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 can finally realize the harmful components for reducing metallic iron as steelmaking feed, reduce energy consumption and production cost, simplify the effect of technique as the raw material for producing aluminum oxide, metal iron powder.
Description
Technical field
The utility model is related to gas base directly reducing production metallic iron field, more particularly to a kind of high-iron bauxite that handles
System.
Background technology
Bauxite is topmost raw material in current production aluminum oxide, 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
For 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.External bauxite majority is gibbsite type, the high high-quality bauxite of alumina silica ratio.
China is a bauxite resource barren country relatively, and reserves just correspond to world's per capita share to bauxite per capita
7.3%, and China's bauxite principally falls into high silicon, 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, and is predicted according to National Development and Reform Committee, 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 the high-iron bauxite resource of low-quality must not be thinked little of.High swage bauxite 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, which turns into, utilizes high-iron bauxite urgent problem to be solved.
Utility model content
Above-mentioned technical problem is faced, the utility model aims to provide a kind of system of use fluidized bed processing high-iron bauxite
Separate ferro-aluminum, the rich aluminium slag obtained by the system can be used as steel-making original as the raw material for producing aluminum oxide, metal iron powder
Material, eventually arrives at the harmful components for reducing metallic iron, reduces energy consumption and production cost, simplifies the purpose of technique.
To achieve the above object, the utility model proposes a kind of system for handling high-iron bauxite, the system includes
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 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 the high-iron bauxite entrance of metallization, metal iron powder outlet and rich aluminium slag and gone 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 is connected including broken drying device with preheating device order, wherein,
The broken drying device obtains high ferrallite 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 is connected including disintegrating machine, drying equipment with fine grinding equipment order.
Further, the fine grinding separative element is connected including fine grinding device 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.
Had the following advantages using technical scheme described in the utility model：
(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 can not 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 ore2O3The flow of production aluminum oxide could be entered by being reduced in zone of reasonableness.Together
When high-iron bauxite in the close 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 utility model, due to the side of the gas-based reduction of use
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 gold
Belonging to iron powder can be with Al2O3Relatively easily separate, while the composition of high-iron bauxite is not limited to, therefore using gas-based reduction
Method handles high-iron bauxite, more advantageous, and the utility model 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 the utility model 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 make phosphorus sulfur content in metallic iron far low
In traditional blast furnace ironmaking flow.
(4) reduction degree of miberal powder is adjustable, and adjusting method can pass through also Primordial Qi composition, anti-in adjusting in reactor
Temperature and reaction time is answered to carry out flexible modulation.
(5) when handling common iron ore concentrate with fluidized bed process, because iron ore concentrate Iron grade is high, raw material after metallic iron is restored
Easily occur 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 handling high-iron bauxite using fluidized bed process has unique advantage.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Fig. 1 is the system schematic of the present utility model for handling high-iron bauxite；
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 of the present utility model for handling high-iron bauxite.
Embodiment
Below in conjunction with drawings and examples, embodiment of the present utility model is described in more details, with
Just it better understood when the advantage of scheme of the present utility model and its various aspects.However, specific implementations described below side
Formula and embodiment are only the purposes of explanation, rather than to limitation of the present utility model.
The purpose of this utility model is to provide the technique that a kind of high-iron bauxite separates ferro-aluminum resource, utilizes fluid bed reduction
High-iron bauxite powder, carries out magnetic separation after fine grinding by the high-iron bauxite powder of obtained metallization and isolates metal Iron concentrate and rich aluminium
Slag.
To achieve the above object, the utility model proposes a kind of system for handling high-iron bauxite, such as Fig. 1, the system
System includes pretreatment unit 1, reduction unit 2 and fine grinding separative element 3, 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
High-iron bauxite entrance, metal iron powder outlet and the rich aluminium slag outlet of metallization, 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 is sequentially connected including broken drying device 11 with 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 crushed
Drying equipment is dried, and dried high-iron bauxite is finely ground to certain particle size into the progress of fine grinding equipment and obtains high ferrallite
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, which enters the preheating device, is used for the pre-heat treatment of 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 inputting
Also Primordial Qi, in reduction gas blowout fluidized bed, high-iron bauxite miberal powder so as to forming fluidisation, makes high ferrallite with reduction circulation of vital energy in the wrong direction stream
Ferriferous oxide in ore deposit is reduced.
The utility model be also disclosed it is a kind of handle high-iron bauxite method, such as Fig. 2, the method comprising the steps of,
A pretreatments of raw material：In the pretreatment unit, by high-iron bauxite raw ore carry out it is broken, dry, 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 subjected to gas-based reduction and obtains metal
The high-iron bauxite of change；
C fine grindings are separated：In the fine grinding separative element, fine grinding and physics point are carried out to the high-iron bauxite of the metallization
From obtaining metal iron powder and rich aluminium slag.
High-iron bauxite still can not be applied directly, it is necessary to carry out except iron processing as a kind of ferro-aluminum grandidierite in the prior art
It just can apply to aluminum oxide industry.And the utility model uses fluid bed reduction --- the method for physical separation directly can be entered to it
Row processing, enables the ferro-aluminum in high-iron bauxite to separate.At the same time, the use of high-iron bauxite is raw material in fluid bed,
Eliminate the operation of addition such as MgO or CaO antiplastering aids.The product of technological process is metal iron powder and rich aluminium slag, metal iron powder
Available for 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, the powder control less than 150 mesh is being accounted for into whole originals
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.Used in reduction fluid bed and contain CO+H2The also Primordial Qi of >=70% volume ratio is carried out to high-iron bauxite agglomerates
Reduction, obtains that in high-iron bauxite metallization miberal powder, reduction process caking inhibiter need not be added.Wherein, fluid bed reduction gas thing
First preheated, temperature reaches 700~950 DEG C after preheating, is then sprayed into by bottom in fluid bed, high-iron bauxite miberal powder and 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 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
For magnetic separation, flotation, the slag separation method such as gravity treatment.
Below, according to technological process of the present utility model, the high-iron bauxite of four kinds of heterogeneities is selected, rich aluminium is produced
Slag and metal iron powder, specific embodiment are 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 |
High-iron bauxite is dried after 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 reduction temperature is at about 850 DEG C, and the reaction time is 100min.By the high-iron bauxite powder after reduction
Fine grinding to less than 200 mesh, then carrying out magnetic separation separation, obtained metal iron powder composition be shown in Table 1.2 and the composition of rich aluminium slag be shown in Table
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
| Composition | Fe | Al2O3 | SiO2 | TiO2 | CaO | MgO |
| Content/wt100% | 5.86 | 53.54 | 12.12 | 10.71 | 6.73 | 1.68 |
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 |
High-iron bauxite is dried after 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, reduction temperature is at about 900 DEG C, and the reaction time is 60min.By the high-iron bauxite powder after reduction
Fine grinding to less than 200 mesh, then carrying out magnetic separation separation, obtained metal iron powder composition be shown in Table 2.2 and the composition of rich aluminium slag be shown in Table
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 |
High-iron bauxite is dried after 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, reduction temperature is at about 1050 DEG C, and the reaction time is 30min.By the high ferrallite after reduction
Miberal powder fine grinding is shown in Table the composition of 3.2 and rich aluminium slag to magnetic separation separation, obtained metal iron powder composition less than 100 mesh, is then carried out
It 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 |
High-iron bauxite is dried after 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, reduction temperature is at about 700 DEG C, and the reaction time is 90min.By the high-iron bauxite powder after reduction
Fine grinding to less than 200 mesh, then carrying out magnetic separation separation, obtained metal iron powder composition be shown in Table 4.2 and the composition of rich aluminium slag be shown in Table
4.3。
The main component (wt%) of the metal iron powder 4 of table 4.2
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 is 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 usual blast furnace process or the temperature levels of about 1600 DEG C of 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 finally given is high, reaches more than 88%, available for steel-making life
Production；Al in rich aluminium slag2O3More than 51% is reached, available for alumina producing.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And the not restriction to embodiment.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.And thus
Among the obvious changes or variations amplified out is still in protection domain of the present utility model.
Claims (5)
1. a kind of system for handling high-iron bauxite, the system includes 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 high-iron bauxite powder entrance, reducing gas after preheating and entered
Mouth, the high-iron bauxite outlet of metallization, the high ferrallite 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 with the high-iron bauxite outlet of the metallization to be connected.
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 disintegrating machine, drying equipment and is connected with fine grinding equipment 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. system according to claim 1, it is characterised in that the fine grinding separative element includes fine grinding device and physics point
It is connected from device sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106929665A (en) * | 2017-03-14 | 2017-07-07 | 江苏省冶金设计院有限公司 | A kind of system and method for processing high-iron bauxite |
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