CN106244754A - Process the method and system of red mud - Google Patents
Process the method and system of red mud Download PDFInfo
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- CN106244754A CN106244754A CN201610626079.8A CN201610626079A CN106244754A CN 106244754 A CN106244754 A CN 106244754A CN 201610626079 A CN201610626079 A CN 201610626079A CN 106244754 A CN106244754 A CN 106244754A
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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
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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- C—CHEMISTRY; METALLURGY
- 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
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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Abstract
The invention discloses the method and system processing red mud.Wherein, the method processing red mud includes: with high volatilization pulverized coal and high fixed carbon coal dust, red mud is carried out mixed processing, in order to obtain mixture；It is shaped described mixture processing, in order to obtain pelletizing；Described pelletizing is carried out under reducing atmosphere reduction roasting process, in order to obtain containing alkali flue gas and metallized pellet；And described metallized pellet is carried out slag sluicing system process, in order to obtain iron powder and tailings.The method using high volatilization pulverized coal, high fixed carbon coal dust as the reducing agent in red mud reduction process, the high volatility utilizing coal dust strengthens pelletizing porosity, promote the reduction of iron oxides and alkali-metal volatilization, and prevent the bonding discharging difficulty caused of material soft heat, thus obtain low alkali metal content, the metallized pellet of high degree of metalization.
Description
Technical field
The present invention relates to process the method for red mud and process the system of red mud.
Background technology
Red mud is the topmost solid slag produced in aluminum oxide industry production process, and at present, domestic red mud is arranged every year
High-volume more than 30,000,000 t, in addition to small part is applied to the purposes such as manufacture of cement, brickmaking, outdoor the building a dam of most wet method is stored up, now
Red mud accumulation is stored up more than 3.5 hundred million tons.Owing in red mud, alkali content is too high, dealkalize cost is high, thus limits red mud at water
Application in mud.
From the point of view of composition, in red mud, acidic oxide content is the highest, especially Al2O3、SiO2Content is the highest, also
Need during former to add substantial amounts of limestone as basic solvent.When being added without limestone or when addition is less, pelletizing is not
Can sufficiently be reduced, degree of metalization is the lowest, is unfavorable for follow-up slag sluicing system.After adding more limestone, limestone
Middle CaO the most then with FeO, SiO2、Al2O3Form the low-melting compounds such as kirsch-steinite, cause pelletizing soft heat with fire-resistant
Material is bonding seriously, and the metallized pellet therefore obtaining high degree of metalization is more difficult, and existing rotary kiln uses red mud powder to burn
The method of knot, though dealkalize rate can reach more than 60%, but degree of metalization only has 50%-70%, and iron recovery 30%, equipment is easily tied
Circle, production has some setbacks.
From the point of view of condition of molding, red mud retentiveness is strong, and when material is aqueous, stickiness is relatively big, and material is easily reunited and is bonded in
Together, therefore use disk pellet forming process to be difficult to make mother bulb persistently grow up, thus need red mud and coal dust when reducing
Additive uses ball press technique to prepare pelletizing, due to pressure ball drop strength index to be ensured, could protect when ball press pressure is bigger
Demonstrate,prove qualified pellet strength, and now the breathability of pelletizing is poor, the dynamic conditions of carbon reduction when being degrading pelletizing reduction.Separately
Dense due to pressed pellet outward, the alkali metal in red mud can not be volatilized after reduction, causes in Direct Reduction
Dealkalize rate is the lowest, and the alkali metal of more than 80% is all stayed in pelletizing, affects slag or the comprehensive utilization of mine tailing after pelletizing slag sluicing system
With.
Thus, the direct-reduction processing method of red mud requires study.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.To this end, one object of the present invention
Being to propose a kind of method processing red mud, the method uses high volatilization pulverized coal, high fixed carbon coal dust as red mud also simultaneously
Reducing agent during former, utilizes the high volatility of coal dust to strengthen pelletizing porosity, promotes reduction and the alkali metal of iron oxides
Volatilization, thus obtain low alkali metal content, the metallized pellet of high degree of metalization.
According to an aspect of the present invention, the invention provides a kind of method processing red mud.Enforcement according to the present invention
Example, the method includes: with high volatilization pulverized coal and high fixed carbon coal dust, red mud is carried out mixed processing, in order to obtain mixture；
It is shaped described mixture processing, in order to obtain pelletizing；Described pelletizing is carried out under reducing atmosphere reduction roasting process,
To obtain containing alkali flue gas and metallized pellet；And described metallized pellet is carried out slag sluicing system process, in order to obtain ferrum
Powder and tailings.
The method processing red mud according to embodiments of the present invention, using high volatilization pulverized coal, high fixed carbon coal dust as red mud
Reducing agent in reduction process, utilizes the high volatility of coal dust to strengthen pelletizing porosity, promotes reduction and the alkali gold of iron oxides
The volatilization belonged to, and prevent the bonding discharging difficulty caused of material soft heat, thus obtain low alkali metal content, the gold of high degree of metalization
Belong to pellet.Utilizing this metallized pellet to be processed by slag sluicing system and obtain iron powder, the grade of this iron powder and the response rate are high.
It addition, the method for process red mud according to the above embodiment of the present invention, it is also possible to there is following additional technology special
Levy:
According to embodiments of the invention, the alkali metal content of described metallized pellet is not higher than 1%, and porosity is not less than
40%, the alkali removal efficiency that described reduction roasting processes is not less than 80%.
According to embodiments of the invention, the volatile content of described high volatilization pulverized coal is not less than 35 mass %.
According to embodiments of the invention, the fixed carbon content of described high fixed carbon coal dust is not less than 82 mass %.
According to embodiments of the invention, described red mud presses quality with described high volatilization pulverized coal and described high fixed carbon coal dust
Than 100:(8-15): (20-30) carries out described mixed processing.
According to embodiments of the invention, the granularity of described high volatilization pulverized coal is 0.5-4mm.
According to embodiments of the invention, the granularity of described high fixed carbon coal dust is 0.074-0.1mm.
According to a further aspect in the invention, the invention provides a kind of system implementing the method that aforesaid red mud processes.
According to embodiments of the invention, this system includes: mixing device, and described mixing device has red mud entrance, high volatilization pulverized coal
Entrance, high fixed carbon coal powder entrance and mixture outlet；Shaped device, described shaped device has mixture inlet and pelletizing goes out
Mouthful, described mixture inlet is connected with described mixture outlet；Reduction roasting device, described reduction roasting device has pelletizing and enters
Mouth, reducing gases entrance, exporting containing alkali exhanst gas outlet and metallized pellet, described pelletizing entrance is connected with the outlet of described pelletizing；With
And slag sluicing system device, described slag sluicing system device has metallized pellet entrance, iron powder outlet and slag-drip opening, described metallization
Pelletizing entrance is connected with the outlet of described metallized pellet.
Red mud processing system according to embodiments of the present invention, by arranging high volatilization pulverized coal entrance and height at mixing device
Fixed carbon coal powder entrance, mixes high volatilization pulverized coal, high fixed carbon coal dust with red mud, and as going back in red mud reduction process
Former dose, utilize the high volatility of coal dust to strengthen pelletizing porosity, promote the reduction of iron oxides and alkali-metal volatilization, and prevent
The bonding discharging difficulty caused of material soft heat, thus obtain low alkali metal content, the metallized pellet of high degree of metalization.Utilizing should
Metallized pellet carries out slag sluicing system process by slag sluicing system device and obtains iron powder, and the grade of this iron powder and the response rate are high.
According to embodiments of the invention, described shaped device is high pressure roller press ball device.
According to embodiments of the invention, described reduction roasting device is roaster.
According to embodiments of the invention, this system farther includes: fat coal disintegrating machine, and described fat coal breaks
Broken facility have fat coal entrance and high volatilization pulverized coal outlet, the outlet of described high volatilization pulverized coal and described mixing device
Described high volatilization pulverized coal entrance is connected；High fixed carbon coal disintegrating machine, described high fixed carbon coal disintegrating machine has high fixed carbon coal
Entrance and high fixed carbon discharge, described high fixed carbon discharge enters with the described high fixed carbon coal dust of described mixing device
Mouth is connected.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment and will become
Substantially with easy to understand, wherein:
Fig. 1 shows the schematic flow sheet of the method processing red mud according to an embodiment of the invention；
Fig. 2 shows the structural representation of the system processing red mud according to an embodiment of the invention；
Fig. 3 shows the structural representation of the system processing red mud according to another embodiment of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, term " longitudinally ", " laterally ", " on ", D score, "front", "rear", "left", "right", " perpendicular
Directly ", " level ", " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, be only
For the ease of describing the present invention rather than requiring that the present invention must be with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.
It should be noted that term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint phase
To importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", " second " feature permissible
Express or implicitly include one or more this feature.Further, in describing the invention, unless otherwise saying
Bright, " multiple " are meant that two or more.
According to an aspect of the present invention, the invention provides a kind of method processing red mud.With reference to Fig. 1, according to this
Bright embodiment, explains the method for this process red mud, and the method includes:
S100 mixed processing
According to embodiments of the invention, red mud is carried out mixed processing with high volatilization pulverized coal and high fixed carbon coal dust,
To mixture.Using high volatilization pulverized coal, high fixed carbon coal dust as the reducing agent in red mud reduction process, the height of coal dust is utilized to wave
The property sent out strengthens pelletizing porosity, the dynamic conditions reduced in optimizing pelletizing, promotes that the reduction of iron oxides is waved with alkali-metal
Send out, and prevent the bonding discharging difficulty caused of material soft heat, thus obtain the metallization ball of low alkali metal content, high degree of metalization
Group.
According to embodiments of the invention, the volatile content of high volatilization pulverized coal is not less than 35 mass %.Thus, in coal dust
High-volatile component content high, be conducive to strengthening the porosity of pelletizing, promote the reduction of iron oxides and alkali-metal volatilization,
And prevent the bonding discharging difficulty caused of material soft heat.
According to embodiments of the invention, the fixed carbon content of high fixed carbon coal dust is not less than 82 mass %.Thus, fixed carbon
Reduction component content high, be conducive to forming good reducing atmosphere in reduction roasting processes, reduction effect is good, and metallize ball
The degree of metalization of group is high.
According to embodiments of the invention, red mud and high volatilization pulverized coal and high fixed carbon coal dust 100:(8-in mass ratio
15): (20-30) carries out described mixed processing.Thus, red mud is suitable with the ratio of high volatilization pulverized coal and high fixed carbon coal dust,
Fugitive constituent component content in high volatilization pulverized coal is suitable, it is ensured that pelletizing has suitable porosity, and high fixed carbon coal dust
Ratio be also suitable for, make reduction roasting form good reducing atmosphere in processing, again without a large amount of breezes excess.If high-volatile
Coal dust is too low, then the raising of the porosity of pelletizing is inconspicuous, and then, the degree of metalization of metallized pellet is low；If high-volatile
Coal dust is too high, then a large amount of fine coal wastes, and causes pelletizing efflorescence.If the ratio of high fixed carbon coal dust is too low, reducing agent can not
Maintain and preferably reduce atmosphere, be unfavorable for reaching the pelletizing of high degree of metalization；And high fixed carbon coal dust addition is too high, coal dust phase
Too big for breeze coefficient of excess, easily cause pelletizing efflorescence, and increase reducing agent cost.
According to embodiments of the invention, the granularity of high volatilization pulverized coal is 0.5-4mm.Thus, in this particle size range, high
The volatile relese speed of fugitive constituent coal dust is suitable, is conducive to forming uniform hole on pelletizing.If high volatilization pulverized coal
Granularity meticulous, volatile relese easily causes the most rapidly pelletizing soft heat；And fat coal Powder Particle Size is excessive, the most unfavorable
In pelletizing molding, but also the reduction of pelletizing can be affected.
According to embodiments of the invention, the granularity of high fixed carbon coal dust is 0.074-0.1mm.Thus, high fixed carbon coal dust
Granularity suitable, even if coal dust is fully contacted with red mud, takes full advantage of again the coal dust of the industrial small particle being difficult to and applying, make
Production cost is lower.If coal powder size is meticulous, cause pulverized coal preparation high cost；If coal powder size is more than 0.1mm, breeze
Contact with coal dust abundant not, affect the reduction of iron oxides in pelletizing.
S200 forming processes
According to embodiments of the invention, it is shaped mixture processing, obtains pelletizing.Thus, the particle diameter of pelletizing is suitable,
It is easy to follow-up carry out reducing and smelting process.
According to some embodiments of the present invention, mixture adds suitable quantity of water and carries out wet mixing again, then through high pressure roller pressure
System, forms pelletizing, and this preparation process is added without any binding agent.
S300 reduction roasting processes
According to embodiments of the invention, pelletizing is carried out under reducing atmosphere reduction roasting process, obtain containing alkali flue gas and
Metallized pellet.Thus, in reducing roasting process, the iron oxides in red mud is reduced in reducing atmosphere, and a large amount of alkali
Metal volatilizees under the reducing atmosphere of coal dust and escapes in flue gas, makes alkali metal content in pelletizing reduce.
According to some embodiments of the present invention, the alkali metal content of metallized pellet is not higher than 1%, and porosity is not less than
40%, the alkali removal efficiency that reduction roasting processes is not less than 80%.Thus, the method utilizing the embodiment of the present invention, the hole of pelletizing
Rate is high, even rises to more than 40%, alkali-metal reduction volatilization in can promoting pelletizing, and then, alkali-metal removal efficiency is high,
The alkali metal content of metallized pellet is low, the alkali metal erosion to furnace lining when effectively alleviating metallized pellet subsequent smelting, and
The low alkali mine tailing obtained may be used for manufacture of cement.
According to embodiments of the invention, reduction roasting device is roaster.Thus, conventional roaster is utilized to carry out
Reduction roasting, system investments low cost, and, reduction effect is good, and efficiency is high.
According to some embodiments of the present invention, the temperature that reduction roasting processes is 1250～1300 DEG C, the time be 40～
60min.Thus, reduction efficiency is high, and alkali-metal removal efficiency is high, and the degree of metalization of metallized pellet is high.
S400 slag sluicing system processes
According to embodiments of the invention, metallized pellet is carried out slag sluicing system process, obtain iron powder and tailings.Thus,
Processed by slag sluicing system, obtain iron powder.
According to some embodiments of the present invention, slag sluicing system is processed as mill ore magnetic selection and processes.Thus, easy and simple to handle, cost
Low, and, the response rate of ferrum is high.
The method processing red mud according to embodiments of the present invention, high volatilization pulverized coal, high fixed carbon coal dust are made by the method
For the reducing agent in red mud reduction process, utilize the high volatility of coal dust to strengthen pelletizing porosity, promote the reduction of iron oxides
With alkali-metal volatilization, and prevent the bonding discharging difficulty caused of material soft heat, thus obtain low alkali metal content, high metallization
The metallized pellet of rate.Utilize this metallized pellet to be processed by slag sluicing system and obtain iron powder, the grade of this iron powder and the response rate
High.
According to a further aspect in the invention, the invention provides a kind of system implementing the method that aforesaid red mud processes.
With reference to Fig. 2, according to embodiments of the invention, explaining this red mud processing system, this system includes: mixing device
100, shaped device 200, reduction roasting device 300 and slag sluicing system device 400, illustrates one by one to each device below:
Mixing device 100: according to embodiments of the invention, mixing device 100 has red mud entrance 101, fat coal
Powder entrance 102, high fixed carbon coal powder entrance 103 and mixture outlet 104.Mixing device passes through high volatilization pulverized coal entrance and height
Fixed carbon coal powder entrance adds high volatilization pulverized coal, high fixed carbon coal dust to red mud as the reducing agent in red mud reduction process
In, utilize the high volatility of coal dust to strengthen pelletizing porosity, the dynamic conditions reduced in optimizing pelletizing, promote iron oxides
Reduction and alkali-metal volatilization, and prevent the bonding discharging difficulty caused of material soft heat, thus obtain low alkali metal content, Gao Jin
Belong to the metallized pellet of rate.
According to embodiments of the invention, the volatile content of high volatilization pulverized coal is not less than 35 mass %.Thus, in coal dust
High-volatile component content high, be conducive to strengthening the porosity of pelletizing, promote the reduction of iron oxides and alkali-metal volatilization,
And prevent the bonding discharging difficulty caused of material soft heat.
According to embodiments of the invention, the fixed carbon content of high fixed carbon coal dust is not less than 82 mass %.Thus, fixed carbon
Reduction component content high, be conducive to forming good reducing atmosphere in reduction roasting processes, reduction effect is good, and metallize ball
The degree of metalization of group is high.
According to embodiments of the invention, red mud and high volatilization pulverized coal and high fixed carbon coal dust 100:(8-in mass ratio
15): (20-30) carries out described mixed processing.Thus, red mud is suitable with the ratio of high volatilization pulverized coal and high fixed carbon coal dust,
Fugitive constituent component content in high volatilization pulverized coal is suitable, it is ensured that pelletizing has suitable porosity, and high fixed carbon coal dust
Ratio be also suitable for, make reduction roasting form good reducing atmosphere in processing, again without a large amount of breezes excess.If high-volatile
Coal dust is too low, then the raising of the porosity of pelletizing is inconspicuous, and then, the degree of metalization of metallized pellet is low；If high-volatile
Coal dust is too high, then a large amount of fine coal wastes, and causes pelletizing efflorescence.If the ratio of high fixed carbon coal dust is too low, reducing agent can not
Maintain and preferably reduce atmosphere, be unfavorable for reaching the pelletizing of high degree of metalization；And high fixed carbon coal dust addition is too high, coal dust phase
Too big for breeze coefficient of excess, easily cause pelletizing efflorescence, and increase reducing agent cost.
With reference to Fig. 3, according to embodiments of the invention, this system farther includes: fat coal disintegrating machine 500 and Gao Gu
Determining carbon coal disintegrating machine 600, wherein, fat coal disintegrating machine 500 has fat coal entrance 501 and high volatilization pulverized coal goes out
Mouth 502, wherein, high volatilization pulverized coal outlet 502 is connected with the high volatilization pulverized coal entrance 102 of mixing device 100；High fixed carbon
Coal disintegrating machine 600 has high fixed carbon coal entrance 601 and high fixed carbon discharge 602, wherein, high fixed carbon discharge
602 are connected with the high fixed carbon coal powder entrance 103 of mixing device 100.Thus, before mixed processing, the height that particle diameter is bigger is waved
Send out part coal and high fixed carbon coal carries out break process, in order to make coal dust be sufficiently mixed with red mud and contact, be conducive to improving pelletizing
Porosity and degree of metalization.
According to embodiments of the invention, the granularity of high volatilization pulverized coal is 0.5-4mm.Thus, in this particle size range, high
The volatile relese speed of fugitive constituent coal dust is suitable, is conducive to forming uniform hole on pelletizing.If high volatilization pulverized coal
Granularity meticulous, volatile relese easily causes the most rapidly pelletizing soft heat；And fat coal Powder Particle Size is excessive, the most unfavorable
In pelletizing molding, but also the reduction of pelletizing can be affected.
According to embodiments of the invention, the granularity of high fixed carbon coal dust is 0.074-0.1mm.Thus, high fixed carbon coal dust
Granularity suitable, even if coal dust is fully contacted with red mud, takes full advantage of again the coal dust of the industrial small particle being difficult to and applying, make
Production cost is lower.If coal powder size is meticulous, cause pulverized coal preparation high cost；If coal powder size is more than 0.1mm, breeze
Contact with coal dust abundant not, affect the reduction of iron oxides in pelletizing.
Shaped device 200: according to embodiments of the invention, shaped device 200 has mixture inlet 201 and pelletizing outlet
202, wherein, mixture inlet 201 is connected with mixture outlet 104, is shaped mixture processing, obtains pelletizing.Thus,
The particle diameter of pelletizing is suitable, it is simple to follow-up carry out reducing and smelting process.
According to embodiments of the invention, shaped device is high pressure roller press ball device.Thus, mixture adds suitable quantity of water
Carrying out wet mixing again, then suppress through high pressure roller, form pelletizing, this preparation process is added without any binding agent.
Reduction roasting device 300: according to embodiments of the invention, reduction roasting device 300 has pelletizing entrance 301, goes back
Primordial Qi entrance 302, exporting 304 containing alkali exhanst gas outlet 303 and metallized pellet, wherein, pelletizing entrance 301 exports 202 with pelletizing
It is connected, pelletizing is carried out under reducing atmosphere reduction roasting process, obtains containing alkali flue gas and metallized pellet.Thus, in reduction
In roasting process, the iron oxides in red mud is reduced in reducing atmosphere, and a large amount of alkali metal is under the reducing atmosphere of coal dust
Volatilization and escape in flue gas, make in pelletizing alkali metal content reduce.
According to some embodiments of the present invention, the alkali metal content of metallized pellet is not higher than 1%, and porosity is not less than
40%, the alkali removal efficiency that reduction roasting processes is not less than 80%.Thus, utilize the system of the embodiment of the present invention, the hole of pelletizing
Rate is high, even rises to more than 40%, alkali-metal reduction volatilization in can promoting pelletizing, and then, alkali-metal removal efficiency is high,
The alkali metal content of metallized pellet is low, the alkali metal erosion to furnace lining when effectively alleviating metallized pellet subsequent smelting, and
The low alkali mine tailing obtained may be used for manufacture of cement.
According to some embodiments of the present invention, the temperature that reduction roasting processes is 1250～1300 DEG C, the time be 40～
60min.Thus, reduction efficiency is high, and the degree of metalization of metallized pellet is high.
Slag sluicing system device 400: according to embodiments of the invention, slag sluicing system device 400 has metallized pellet entrance
401, iron powder outlet 402 and slag-drip opening 403, wherein, metallized pellet entrance 401 is connected, by gold with metallized pellet outlet 304
Belong to pellet and carry out slag sluicing system process, obtain iron powder and tailings.Thus, processed by slag sluicing system, obtain iron powder.
According to some embodiments of the present invention, slag sluicing system device is mill ore magnetic selection machine.Thus, the simple in construction of device,
Low cost, and, the response rate of ferrum is high.
Below with reference to specific embodiment, the present invention will be described, it should be noted that these embodiments are only explanation
Property, and be not considered as limiting the invention.
Embodiment 1
The method utilizing the embodiment of the present invention, processes red mud, and concrete grammar is as follows:
(1) high volatilization pulverized coal being crushed to 2mm, high fixed carbon coal dust is levigate to-0.074mm, moistens after red mud drying
It is milled to epigranular (-0.043mm accounts for 80%).
(2) material that step (1) obtains carrying out dispensing, wherein, red mud is 100 weight portion meters, and the height allocating 12% into is waved
Sending out part coal dust, 25% high fixed carbon coal dust, the limestone of addition 8% is as additive, by material mix homogeneously, wherein, Gao Gu
Determining carbonaceous reducing agent fixed carbon content is 82%, and in high-volatile content coal dust, volatile content is 38%, all iron content in red mud
It is 35%.
(3) add suitable quantity of water after being mixed by the mixture after step (2) dispensing and carry out wet mixing again, then enter through high pressure roller
Row pressure ball, obtains pelletizing.
(4) pelletizing is dried under conditions of less than 300 DEG C, the pelletizing after being dried.
(5) pelletizing after drying is reduced directly in being placed in reduction furnace, and temperature is 1280 DEG C, and the recovery time is
50min。
(6) pelletizing after step (5) reduction being terminated uses liquid nitrogen directly to cool down, and this pelletizing degree of metalization is after measured
92.4%, alkali metal content is 0.48%.Result shows, utilizes the metal of the metallized pellet that the method for the present invention prepares
Rate is high, and alkali-metal content is low.
Embodiment 2
The method utilizing the embodiment of the present invention, processes red mud, and concrete grammar is as follows:
(1) high volatilization pulverized coal being crushed to 4mm, high fixed carbon coal dust is levigate to 0.1mm, and after red mud drying, profit is milled to
Epigranular (-0.043mm accounts for 80%).
(2) material that step (1) obtains carrying out dispensing, wherein, red mud is 100 weight portion meters, and the height allocating 15% into is waved
Sending out part coal dust, 25% high fixed carbon coal dust, the limestone of addition 8% is as additive, by material mix homogeneously, wherein, Gao Gu
Determining carbonaceous reducing agent fixed carbon content is 82%, and in high-volatile content coal dust, volatile content is 38%, all iron content in red mud
It is 35%.
(3) add suitable quantity of water after being mixed by the mixture after step (2) dispensing and carry out wet mixing again, then enter through high pressure roller
Row pressure ball, obtains pelletizing.
(4) pelletizing is dried under conditions of less than 300 DEG C, the pelletizing after being dried.
(5) being reduced directly in pelletizing after drying being placed in reduction furnace, temperature is 1300 DEG C, and the recovery time is 40min.
(6) using liquid nitrogen directly to cool down after step (5) reduction being terminated, this pelletizing degree of metalization is 91.4% after measured,
Alkali metal content is 0.37%.Result shows, the degree of metalization utilizing the metallized pellet that the method for the present invention prepares is high,
Alkali-metal content is low.
Embodiment 3
The method utilizing the embodiment of the present invention, processes red mud, and concrete grammar is as follows:
(1) high volatilization pulverized coal being crushed to 0.1mm, high fixed carbon coal dust is levigate to 0.074mm, moistens after red mud drying
It is milled to epigranular (-0.043mm accounts for 80%).
(2) material that step (1) obtains carrying out dispensing, wherein, red mud is 100 weight portion meters, and the height allocating 15% into is waved
Sending out part coal dust, 25% high fixed carbon coal dust, the limestone of addition 8% is as additive, by material mix homogeneously, wherein, Gao Gu
Determining carbonaceous reducing agent fixed carbon content is 82%, and in high-volatile content coal dust, volatile content is 38%, all iron content in red mud
It is 35%.
(3) add suitable quantity of water after being mixed by the mixture after step (2) dispensing and carry out wet mixing again, then enter through high pressure roller
Row pressure ball, obtains pelletizing.
(4) pelletizing is dried under conditions of less than 300 DEG C, the pelletizing after being dried.
(5) pelletizing after drying is reduced directly in being placed in reduction furnace, and temperature is 1300 DEG C, and the recovery time is
40min。
(6) pelletizing after step (5) reduction being terminated uses liquid nitrogen directly to cool down, and this pelletizing degree of metalization is after measured
92.22%, alkali metal content is 0.87%.Result shows, utilizes the gold of the metallized pellet that the method for the present invention prepares
Belonging to rate high, alkali-metal content is low.
Embodiment 4
The method utilizing the embodiment of the present invention, processes red mud, and concrete grammar is as follows:
(1) high volatilization pulverized coal being crushed to 2mm, high fixed carbon coal dust is levigate to 0.074mm, profit mill after red mud drying
To epigranular (-0.043mm accounts for 80%).
(2) material that step (1) obtains carrying out dispensing, wherein, red mud is 100 weight portion meters, allocates the high volatilization of 8% into
Part coal dust, 28% high fixed carbon coal dust, the limestone of addition 8% is as additive, by material mix homogeneously, wherein, high fixing
Carbonaceous reducing agent fixed carbon content is 82%, and in high-volatile content coal dust, volatile content is 38%, and in red mud, all iron content is
35%.
(3) add suitable quantity of water after being mixed by the mixture after step (2) dispensing and carry out wet mixing again, then enter through high pressure roller
Row pressure ball, obtains pelletizing.
(4) pelletizing is dried under conditions of less than 300 DEG C, the pelletizing after being dried.
(5) pelletizing after drying is reduced directly in being placed in reduction furnace, and temperature is 1280 DEG C, and the recovery time is
50min。
(6) pelletizing after step (5) reduction being terminated uses liquid nitrogen directly to cool down, and pelletizing degree of metalization is after measured
90.12%, alkali metal content is 0.77%.Result shows, utilizes the gold of the metallized pellet that the method for the present invention prepares
Belonging to rate high, alkali-metal content is low.
Embodiment 5
The method utilizing the embodiment of the present invention, processes red mud, and concrete grammar is as follows:
(1) high volatilization pulverized coal being crushed to 0.074mm, high fixed carbon coal dust is levigate to 0.074mm, after red mud drying
Profit is milled to epigranular (-0.043mm accounts for 80%).
(2) material that step (1) obtains carrying out dispensing, wherein, red mud is 100 weight portion meters, and the height allocating 15% into is waved
Sending out part coal dust, 25% high fixed carbon coal dust, the limestone of addition 8% is as additive, by material mix homogeneously, wherein, Gao Gu
Determining carbonaceous reducing agent fixed carbon content is 82%, and in high-volatile content coal dust, volatile content is 38%, all iron content in red mud
It is 35%.
(3) add suitable quantity of water after being mixed by the mixture after step (2) dispensing and carry out wet mixing again, then enter through high pressure roller
Row pressure ball, obtains pelletizing.
(4) pelletizing is dried under conditions of less than 300 DEG C, the pelletizing after being dried.
(5) being reduced directly in pelletizing after drying being placed in reduction furnace, temperature is 1300 DEG C, and the recovery time is 40min.
(6) pelletizing after step (5) reduction being terminated uses liquid nitrogen directly to cool down, and pelletizing degree of metalization is after measured
87.12%, alkali metal content is 1.37%.Result shows, utilizes the gold of the metallized pellet that the method for the present invention prepares
Belonging to rate high, alkali-metal content is low.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
These embodiments can be carried out multiple change in the case of departing from the principle of the present invention and objective, revise, replace and modification, this
The scope of invention is limited by claim and equivalent thereof.
Claims (10)
1. the method processing red mud, it is characterised in that including:
Red mud is carried out mixed processing with high volatilization pulverized coal and high fixed carbon coal dust, in order to obtain mixture；
It is shaped described mixture processing, in order to obtain pelletizing；
Described pelletizing is carried out under reducing atmosphere reduction roasting process, in order to obtain containing alkali flue gas and metallized pellet；And
Described metallized pellet is carried out slag sluicing system process, in order to obtain iron powder and tailings.
Method the most according to claim 1, it is characterised in that the alkali metal content of described metallized pellet is not higher than 1%,
Porosity is not less than 40%, and the alkali removal efficiency that described reduction roasting processes is not less than 80%.
Method the most according to claim 1 and 2, it is characterised in that the volatile content of described high volatilization pulverized coal is the lowest
In 35 mass %,
Optionally, the fixed carbon content of described high fixed carbon coal dust is not less than 82 mass %.
4. according to the method described in any one of claim 1-3, it is characterised in that described red mud and described high volatilization pulverized coal and
Described high fixed carbon coal dust 100:(8-15 in mass ratio): (20-30) carries out described mixed processing.
5. according to the method described in any one of claim 1-4, it is characterised in that the granularity of described high volatilization pulverized coal is 0.5-
4mm。
6. according to the method described in any one of claim 1-5, it is characterised in that the granularity of described high fixed carbon coal dust is
0.074-0.1mm。
7. the system of the method that the red mud that a kind is implemented described in any one of claim 1-6 processes, it is characterised in that including:
Mixing device, described mixing device has red mud entrance, high volatilization pulverized coal entrance, high fixed carbon coal powder entrance and mixing
Thing exports；
Shaped device, described shaped device has mixture inlet and pelletizing outlet, described mixture inlet and described mixture
Outlet is connected；
Reduction roasting device, described reduction roasting device have pelletizing entrance, reducing gases entrance, containing alkali exhanst gas outlet and metallization
Pelletizing exports, and described pelletizing entrance is connected with the outlet of described pelletizing；And
Slag sluicing system device, described slag sluicing system device has metallized pellet entrance, iron powder outlet and slag-drip opening, described metal
Pellet entrance is connected with the outlet of described metallized pellet.
System the most according to claim 7, it is characterised in that described shaped device is high pressure roller press ball device.
9. according to the system described in claim 7 or 8, it is characterised in that described reduction roasting device is roaster.
10. according to the system described in any one of claim 7-9, it is characterised in that farther include:
Fat coal disintegrating machine, described fat coal disintegrating machine has fat coal entrance and high volatilization pulverized coal goes out
Mouthful, the outlet of described high volatilization pulverized coal is connected with the described high volatilization pulverized coal entrance of described mixing device；
High fixed carbon coal disintegrating machine, described high fixed carbon coal disintegrating machine has high fixed carbon coal entrance and high fixed carbon coal dust goes out
Mouthful, described high fixed carbon discharge is connected with the described high fixed carbon coal powder entrance of described mixing device.
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