CN107083478B - A kind of method and system preparing metallized pellet using red mud - Google Patents
A kind of method and system preparing metallized pellet using red mud Download PDFInfo
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- CN107083478B CN107083478B CN201710380821.6A CN201710380821A CN107083478B CN 107083478 B CN107083478 B CN 107083478B CN 201710380821 A CN201710380821 A CN 201710380821A CN 107083478 B CN107083478 B CN 107083478B
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- red mud
- pelletizing
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- dry
- outlet
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Classifications
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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
- C22B1/005—Preliminary treatment of scrap
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
Abstract
The invention discloses a kind of method and system preparing metallized pellet using red mud.This method comprises the following steps：Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are uniformly mixed, red mud is washed；Red mud after washing is settled, is filtered, aqueous red mud and filtrate are obtained；Aqueous red mud is dried, dry red mud is obtained；Dry red mud is mixed with reduction coal, is molded, pelletizing is obtained；It is reduced directly after pelletizing is dried, obtains metallized pellet.The present invention can not only promote the sedimentation of red mud by the way that calcium oxide is added during laterite washing, also help the direct-reduction technique of follow-up red mud.
Description
Technical field
The invention belongs to Direct Reduction Technologies to comprehensively utilize direction, and in particular, to a kind of to prepare metallization using red mud
The method and system of pelletizing.
Background technology
It in Bayer process alumina producing, needs to separate sodium aluminate solution and red mud, red mud is heavy using after washing entering
Drop slot is precipitated, and is obtained red mud and is carried out stockpiling and subsequent utilization.Since red mud grain graininess is tiny irregular, have higher
Specific surface area has very strong rich water performance, and for moisture content generally 60% or so, these properties keep its separation extremely difficult,
Separation needs time overlength, and separation of solid and liquid is unclear, is long-term stacking in the prior art, natural drying can just try to comprehensively utilize.
Currently in order to improving the efficiency of red- mud settlement and separation in domestic aluminum oxide production process, it is necessary to add efficient flocculant, such wadding
Solidifying agent relies primarily on import, expensive, and is unfavorable for the subsequently utilization to red mud.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of methods preparing metallized pellet using red mud, including
Following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are uniformly mixed, the red mud is washed；
Red mud after washing is settled, is filtered, aqueous red mud and filtrate are obtained；
The aqueous red mud is dried, dry red mud is obtained；
The dry red mud is mixed with reduction coal, is molded, pelletizing is obtained；
It is reduced directly after the pelletizing is dried, obtains metallized pellet.
In some embodiments of the invention, the addition of the calcium oxide is the 3%~20% of butt red mud quality.
In some embodiments of the invention, the addition of the calcium oxide is the 5%~15% of butt red mud quality.
In some embodiments of the invention, the addition of the reduction coal is the 10%~30% of butt red mud quality.
On this basis, the present invention also provides a kind of systems preparing metallized pellet using the above method, including：
Agitator treating device is equipped with red mud entrance, calcium oxide entrance, hot water inlet and discharge port；
Filter device is equipped with feed inlet, the outlet of aqueous red mud and filtrate (liquid, the feed inlet and is filled with the agitator treating
The discharge port set is connected；
First drying unit, is equipped with aqueous red mud entrance and dry red mud exports, the aqueous red mud entrance and the mistake
The aqueous red mud outlet for filtering device is connected；
Mixing device is equipped with dry red mud entrance, reduction coal entrance and mixture outlet, the dry red mud entrance and institute
The drying red mud outlet for stating the first drying unit is connected；
Press ball device, is equipped with mixture entrance and pelletizing exports, the mixing of the mixture entrance and the mixing device
Material outlet is connected；
Second drying unit, is equipped with pelletizing entrance and dry pelletizing exports, the pelletizing entrance and the press ball device
Pelletizing outlet is connected；
Reduction apparatus is equipped with dry pelletizing entrance and metallized pellet outlet, the dry pelletizing entrance and described second
The drying pelletizing outlet of drying unit is connected.
In some embodiments of the invention, the reduction apparatus includes rotary hearth furnace, rotary kiln or tunnel oven.
The present invention can not only promote the sedimentation of red mud, also help by the way that calcium oxide is added during laterite washing
The direct-reduction technique of follow-up red mud.Calcium oxide promotes the goethite in red mud to be transformed into bloodstone at high temperature, and sodalite turns
Become cancrinite, reduce red mud specific surface area, improves red-mud settlement efficiency.Effect of settling improvement can shorten the sedimentation time, subtract
Small subsider.
It calcium oxide is added in washing process reduces sodium in red mud and bring into, moreover it is possible to mitigate alkali metal in Direct Reduction
Erosion to refractory material promotes direct reduction reactor.
In addition, calcium oxide is mixed with red mud, promote the progress of direct reduction reactor, energy in subsequent Direct Reduction
Improve pelletizing degree of metalization.
Description of the drawings
Fig. 1 is a kind of process flow chart preparing metallized pellet using red mud in the embodiment of the present invention.
Fig. 2 is a kind of structural schematic diagram of system preparing metallized pellet in the embodiment of the present invention.
Specific implementation mode
Below in conjunction with drawings and examples, the specific implementation mode of the present invention is described in more details, so as to energy
The advantages of enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and reality
It applies example to be for illustrative purposes only, rather than limiting the invention.
As shown in Figure 1, the method provided by the invention for preparing metallized pellet using red mud includes the following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are uniformly mixed, red mud is washed；
Red mud after washing is settled, is filtered, aqueous red mud and filtrate are obtained；
Aqueous red mud is dried, dry red mud is obtained；
Dry red mud is mixed with reduction coal, is molded, pelletizing is obtained；
It is reduced directly after pelletizing is dried, obtains metallized pellet.
The red mud grain graininess generated in alumina producing is tiny irregular, has higher specific surface area, has very strong
Rich water performance, be separated by solid-liquid separation in the infall process of red mud it is extremely difficult, separation need time overlength.The present invention is in laterite washing
Calcium oxide is added in the process, the addition of calcium oxide can reduce the specific surface area of red mud, accelerated sedimentation process.Filtrate can return
To the dilution for alumina leaching liquid.
During subsequent direct-reduction handles red mud, calcium oxide can promote the progress of direct reduction reactor, reduce also
Former temperature promotes iron particle to grow up, and reduction efficiency is improved, to improve pelletizing degree of metalization.
In addition, the addition of calcium oxide, the content of sodium in red mud can be reduced by washing, sodium content can change in red mud
Kind direct-reduction effect, reduces erosion of the alkali metal to direct reduction equipment.
In the preferred embodiment of the invention, the addition of calcium oxide is the 3%~20% of butt red mud quality.More preferably
Ground, the addition of calcium oxide are the 5%~15% of butt red mud quality.
The present invention restores red mud using reduction coal, and in the preferred embodiment of the invention, the addition of reduction coal is butt
The 10%~30% of red mud quality.
As shown in Fig. 2, the system provided by the invention for preparing metallized pellet using the above method includes：Agitator treating fills
Set 1, filter device 2, the first drying unit 3, mixing device 4, press ball device 5, the second drying unit 6, reduction apparatus 7.
Agitator treating device 1 is equipped with red mud entrance, calcium oxide entrance, hot water inlet and discharge port for washing red mud.
Filter device 2 is used for separating red mud and filtrate, is equipped with feed inlet, the outlet of aqueous red mud and filtrate (liquid, feed inlet
It is connected with the discharge port of agitator treating device 1.
First drying unit 3 is equipped with aqueous red mud entrance and dry red mud exports, aqueous red mud for drying aqueous red mud
Entrance is connected with the outlet of the aqueous red mud of filter device 2.
Mixing device 4 is equipped with dry red mud entrance, reduction coal entrance and mixing for red mud and reduction coal to be uniformly mixed
Material outlet, dry red mud entrance are connected with the outlet of the drying red mud of the first drying unit 3.
Press ball device 5 is used to prepare pelletizing, is equipped with mixture entrance and pelletizing exports, mixture entrance and mixing device 4
Mixture outlet be connected.
Second drying unit 6 is exported for drying pelletizing equipped with pelletizing entrance and dry pelletizing, and pelletizing entrance is filled with pressure ball
Set 5 pelletizing outlet be connected.
Reduction apparatus 7 prepares metallized pellet for restoring red mud.Reduction apparatus 7 is equipped with dry pelletizing entrance and metal
Pellet exports, and dry pelletizing entrance is connected with the outlet of the drying pelletizing of the second drying unit 6.
Device used in the present invention can be selected arbitrarily according to actual needs.In the preferred embodiment of the invention, filtering
Device is preferably vacuum filter.In the preferred embodiment of the invention, reduction apparatus includes rotary hearth furnace, rotary kiln or tunnel
Kiln.
Below with reference to specific embodiment, the present invention will be described.Institute's taking technique condition value is in following embodiments
Illustratively, numberical range is can use as shown in foregoing summary.Detection method used in following embodiments is one's own profession
The detection method of industry routine.
Embodiment 1
The present embodiment prepares metallized pellet using technological process shown in FIG. 1 and system shown in Fig. 2, specific as follows：
The present embodiment uses the red mud slurry generated in Bayer process alumina producing, water content 35%.It is sent to
In agitator treating device 1, the calcium oxide that equivalent butt red mud quality 5% is added stirs evenly, and the hot water for being added 100 DEG C carries out
Washing.
Red mud after washing is settled, is sent into filter device 2 and is filtered, obtain aqueous red mud and filtrate.
Filtrate is returned into the dilution for alumina leaching liquid；Aqueous red mud is sent into the first drying unit 3 and is carried out
It is dry, obtain dry red mud.TFe28.65% in red mud, CaO10.27%, Na2O1.62%.
Dry red mud and reduction coal are sent into mixing device 4 and are uniformly mixed, mixture is obtained.The addition of reduction coal is
The 22% of butt red mud quality.
It feeds the mixture into press ball device 5, is prepared into pelletizing, and pelletizing is sent into drying in the second drying unit 6, obtains
Pelletizing must be dried.
Dry pelletizing is sent into reduction apparatus 7 and is reduced directly, the metallized pellet of degree of metalization 90% is obtained.
Embodiment 2
The present embodiment prepares metallized pellet using technological process shown in FIG. 1 and system shown in Fig. 2, specific as follows：
The present embodiment uses the red mud slurry generated in Bayer process alumina producing, water content 35%.It is sent to
In agitator treating device 1, the calcium oxide that equivalent butt red mud quality 15% is added stirs evenly, and the hot water for being added 80 DEG C carries out
Washing.
Red mud after washing is settled, is sent into filter device 2 and is filtered, obtain aqueous red mud and filtrate.
Filtrate is returned into the dilution for alumina leaching liquid；Aqueous red mud is sent into the first drying unit 3 and is carried out
It is dry, obtain dry red mud.TFe27.19% in red mud, CaO11.36%, Na2O1.08%.
Dry red mud and reduction coal are sent into mixing device 4 and are uniformly mixed, mixture is obtained.The addition of reduction coal is
The 20% of butt red mud quality.
It feeds the mixture into press ball device 5, is prepared into pelletizing, and pelletizing is sent into drying in the second drying unit 6, obtains
Pelletizing must be dried.
Dry pelletizing is sent into reduction apparatus 7 and is reduced directly, the metallized pellet of degree of metalization 91% is obtained.
Embodiment 3
The present embodiment prepares metallized pellet using technological process shown in FIG. 1 and system shown in Fig. 2, specific as follows：
The present embodiment uses the red mud slurry generated in Bayer process alumina producing, water content 35%.It is sent to
In agitator treating device 1, the calcium oxide that equivalent butt red mud quality 3% is added stirs evenly, and the hot water for being added 100 DEG C carries out
Washing.
Red mud after washing is settled, is sent into filter device 2 and is filtered, obtain aqueous red mud and filtrate.
Filtrate is returned into the dilution for alumina leaching liquid；Aqueous red mud is sent into the first drying unit 3 and is carried out
It is dry, obtain dry red mud.TFe30.63% in red mud, CaO8.76%, Na2O2.17%.
Dry red mud and reduction coal are sent into mixing device 4 and are uniformly mixed, mixture is obtained.The addition of reduction coal is
The 10% of butt red mud quality.
It feeds the mixture into press ball device 5, is prepared into pelletizing, and pelletizing is sent into drying in the second drying unit 6, obtains
Pelletizing must be dried.
Dry pelletizing is sent into reduction apparatus 7 and is reduced directly, the metallized pellet of degree of metalization 88% is obtained.
Embodiment 4
The present embodiment prepares metallized pellet using technological process shown in FIG. 1 and system shown in Fig. 2, specific as follows：
The present embodiment uses the red mud slurry generated in Bayer process alumina producing, water content 35%.It is sent to
In agitator treating device 1, be added and convert into the calcium oxide of butt red mud quality 20% and stir evenly, and be added 100 DEG C of hot water into
Row washing.
Red mud after washing is settled, is sent into filter device 2 and is filtered, obtain aqueous red mud and filtrate.
Filtrate is returned into the dilution for alumina leaching liquid；Aqueous red mud is sent into the first drying unit 3 and is carried out
It is dry, obtain dry red mud.TFe26.97% in red mud, CaO18.21%, Na2O1.09%.
Dry red mud and reduction coal are sent into mixing device 4 and are uniformly mixed, mixture is obtained.The addition of reduction coal is
The 30% of butt red mud quality.
It feeds the mixture into press ball device 5, is prepared into pelletizing, and pelletizing is sent into drying in the second drying unit 6, obtains
Pelletizing must be dried.
Dry pelletizing is sent into reduction apparatus 7 and is reduced directly, the metallized pellet of degree of metalization 89% is obtained.
From above-described embodiment it is found that the degree of metalization of technique using the present invention metallized pellet made from red mud is high.
To sum up, the present invention can not only promote the sedimentation of red mud, also by the way that calcium oxide is added during laterite washing
Conducive to the direct-reduction technique of follow-up red mud.Calcium oxide promotes the goethite in red mud to be transformed into bloodstone, square sodium at high temperature
Stone is transformed into cancrinite, reduces red mud specific surface area, improves red-mud settlement efficiency.When effect of settling improvement can shorten sedimentation
Between, reduce subsider.
It calcium oxide is added in washing process reduces sodium in red mud and bring into, moreover it is possible to mitigate alkali metal in Direct Reduction
Erosion to refractory material promotes direct reduction reactor.
In addition, calcium oxide is mixed with red mud, promote the progress of direct reduction reactor, energy in subsequent Direct Reduction
Improve pelletizing degree of metalization.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and not to embodiment
It limits.For those of ordinary skill in the art, other different forms can also be made on the basis of the above description
Variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And it thus amplifies out apparent
Variation or variation be still in the protection scope of this invention.
Claims (6)
1. a kind of method preparing metallized pellet using red mud, which is characterized in that include the following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are uniformly mixed, the red mud is washed；
Red mud after washing is settled, is filtered, aqueous red mud and filtrate are obtained；
The aqueous red mud is dried, dry red mud is obtained；
The dry red mud is mixed with reduction coal, is molded, pelletizing is obtained；
It is reduced directly after the pelletizing is dried, obtains metallized pellet.
2. according to the method described in claim 1, it is characterized in that, the addition of the calcium oxide is butt red mud quality
3%~20%.
3. according to the method described in claim 2, it is characterized in that, the addition of the calcium oxide is butt red mud quality
5%~15%.
4. according to the method described in claim 1, it is characterized in that, the addition of the reduction coal is butt red mud quality
10%~30%.
5. the system that any the method prepares metallized pellet in a kind of 1-4 using claim, which is characterized in that including：
Agitator treating device is equipped with red mud entrance, calcium oxide entrance, hot water inlet and discharge port；
Filter device is equipped with feed inlet, the outlet of aqueous red mud and filtrate (liquid, the feed inlet and the agitator treating device
Discharge port is connected；
First drying unit, is equipped with aqueous red mud entrance and dry red mud exports, and the aqueous red mud entrance is filled with the filtering
The aqueous red mud outlet set is connected；
Mixing device, is equipped with dry red mud entrance, reduction coal entrance and mixture outlet, the dry red mud entrance and described the
The drying red mud outlet of one drying unit is connected；
Press ball device, is equipped with mixture entrance and pelletizing exports, and the mixture of the mixture entrance and the mixing device goes out
Mouth is connected；
Second drying unit, is equipped with pelletizing entrance and dry pelletizing exports, the pelletizing of the pelletizing entrance and the press ball device
Outlet is connected；
Reduction apparatus, is equipped with dry pelletizing entrance and metallized pellet outlet, and the dry pelletizing entrance is dried with described second
The drying pelletizing outlet of device is connected.
6. system according to claim 5, which is characterized in that the reduction apparatus includes rotary hearth furnace, rotary kiln or tunnel
Kiln.
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| CN201710380821.6A CN107083478B (en) | 2017-05-25 | 2017-05-25 | A kind of method and system preparing metallized pellet using red mud |
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| CN201710380821.6A CN107083478B (en) | 2017-05-25 | 2017-05-25 | A kind of method and system preparing metallized pellet using red mud |
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| CN107083478B true CN107083478B (en) | 2018-08-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4360378A (en) * | 1979-03-01 | 1982-11-23 | Lindstroem Ab Olle | Direct reduction of iron oxide containing material with biofuel |
| US5855643A (en) * | 1994-06-23 | 1999-01-05 | Voest-Alpine Industrieanlagenbau Gmbh | Direct reduction process for iron oxide-containing materials |
| CN106191464A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | The pyrolysis of a kind of lateritic nickel ore dry bulb group and reduction reaction system and method |
| CN205907327U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for recovering iron in follow red mud |
| CN205907320U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN205907329U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN206828586U (en) * | 2017-05-25 | 2018-01-02 | 江苏省冶金设计院有限公司 | A kind of system that metallized pellet is prepared using red mud |
-
2017
- 2017-05-25 CN CN201710380821.6A patent/CN107083478B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4360378A (en) * | 1979-03-01 | 1982-11-23 | Lindstroem Ab Olle | Direct reduction of iron oxide containing material with biofuel |
| US5855643A (en) * | 1994-06-23 | 1999-01-05 | Voest-Alpine Industrieanlagenbau Gmbh | Direct reduction process for iron oxide-containing materials |
| CN205907327U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for recovering iron in follow red mud |
| CN205907320U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN205907329U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN106191464A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | The pyrolysis of a kind of lateritic nickel ore dry bulb group and reduction reaction system and method |
| CN206828586U (en) * | 2017-05-25 | 2018-01-02 | 江苏省冶金设计院有限公司 | A kind of system that metallized pellet is prepared using red mud |
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