CN107083478A - A kind of utilization red mud prepares the method and system of metallized pellet - Google Patents
A kind of utilization red mud prepares the method and system of metallized pellet Download PDFInfo
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- CN107083478A CN107083478A CN201710380821.6A CN201710380821A CN107083478A CN 107083478 A CN107083478 A CN 107083478A CN 201710380821 A CN201710380821 A CN 201710380821A CN 107083478 A CN107083478 A CN 107083478A
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- Prior art keywords
- red mud
- pelletizing
- entrance
- outlet
- aqueous
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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 the method and system that a kind of utilization red mud prepares metallized pellet.This method comprises the following steps：Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are well mixed, red mud is washed；Red mud after washing is settled, filtered, aqueous red mud and filtrate is obtained；Aqueous red mud is dried, obtains and dries red mud；Red mud will be dried to mix, be molded with reduction coal, 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, also help the direct-reduction technique of follow-up red mud by adding calcium oxide during laterite washing.
Description
Technical field
The invention belongs to Direct Reduction Technology comprehensive utilization direction, in particular it relates to which a kind of prepare metallization using red mud
The method and system of pelletizing.
Background technology
, it is necessary to which sodium aluminate solution is separated with red mud in Bayer process alumina producing, red mud enters heavy after washing again
Drop groove is precipitated, and is obtained red mud and is stored up and follow-up utilization.Because red mud grain graininess is tiny irregular, with higher
Specific surface area, has very strong rich water performance, moisture content is typically 60% or so, and these properties make its separation extremely difficult,
Separation needs time overlength, and separation of solid and liquid is unclear, is long-term stacking in the prior art, and natural drying can just try comprehensive utilization.
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 follow-up utilization to red mud.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of method that utilization red mud prepares metallized pellet, including
Following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are well mixed, the red mud is washed；
Red mud after washing is settled, filtered, aqueous red mud and filtrate is obtained；
The aqueous red mud is dried, obtains and dries red mud；
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, present invention also offers the system that a kind of utilization above method prepares metallized pellet, including：
Agitator treating device, provided with red mud entrance, calcium oxide entrance, hot water inlet and discharging opening；
Filter, provided with charging aperture, the outlet of aqueous red mud and filtrate (liquid, the charging aperture is filled with the agitator treating
The discharging opening put is connected；
First drying unit, provided with aqueous red mud entrance and dry red mud outlet, the aqueous red mud entrance and the mistake
The aqueous red mud outlet for filtering device is connected；
Mixing device, is exported, the dry red mud entrance and institute provided with red mud entrance, reduction coal entrance and compound is dried
The drying red mud outlet for stating the first drying unit is connected；
Press ball device, is exported, the mixing of the compound entrance and the mixing device provided with compound entrance and pelletizing
Material outlet is connected；
Second drying unit, provided with pelletizing entrance and dry pelletizing outlet, the pelletizing entrance and the press ball device
Pelletizing outlet is connected；
Reduction apparatus, provided 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 cave.
The present invention can not only promote the sedimentation of red mud, also help by adding calcium oxide 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, improve red-mud settlement efficiency.Effect of settling, which improves, can shorten the sedimentation time, subtract
Small subsider.
Calcium oxide is added in washing process reduce 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 follow-up Direct Reduction
Improve pelletizing degree of metalization.
Brief description of the drawings
Fig. 1 prepares the process chart of metallized pellet for a kind of utilization red mud in the embodiment of the present invention.
Fig. 2 be the embodiment of the present invention in a kind of system for preparing metallized pellet structural representation.
Embodiment
Below in conjunction with drawings and examples, the embodiment to the present invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
Apply the purpose that example is only explanation, rather than limitation of the present invention.
As shown in figure 1, the method that the utilization red mud that the present invention is provided prepares metallized pellet comprises the following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are well mixed, red mud is washed；
Red mud after washing is settled, filtered, aqueous red mud and filtrate is obtained；
Aqueous red mud is dried, obtains and dries red mud；
Red mud will be dried to mix, be molded with reduction coal, pelletizing is obtained；
It is reduced directly after pelletizing is dried, obtains metallized pellet.
The red mud grain graininess produced in alumina producing is tiny irregular, with higher specific surface area, there is very strong
Rich water performance, separation of solid and liquid is extremely difficult in the infall process of red mud, and separation needs time overlength.The present invention is in laterite washing
During add calcium oxide, the addition of calcium oxide can reduce the specific surface area of red mud, Accelerated subsidence process.Filtrate can return
To the dilution for alumina leaching liquid.
During follow-up direct-reduction processing red mud, calcium oxide can promote the progress of direct reduction reactor, and reduction is also
Former temperature, promotes iron particle to grow up, and reduction efficiency is improved, so as to improve pelletizing degree of metalization.
In addition, the addition of calcium oxide, can changing for sodium content in the content of sodium in red mud, red mud can be reduced by washing
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 is the 5%~15% of butt red mud quality.
The present invention reduces red mud using reduction coal, in the preferred embodiment of the invention, and the addition of reduction coal is butt
The 10%~30% of red mud quality.
As shown in Fig. 2 the system that the utilization above method that the present invention is provided prepares metallized pellet includes：Agitator treating is filled
Put 1, filter 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 used to wash red mud, provided with red mud entrance, calcium oxide entrance, hot water inlet and discharging opening.
Filter 2 is used for separating red mud and filtrate, provided with charging aperture, the outlet of aqueous red mud and filtrate (liquid, charging aperture
It is connected with the discharging opening of agitator treating device 1.
First drying unit 3 is used to dry aqueous red mud, provided with aqueous red mud entrance and dry red mud outlet, aqueous red mud
Entrance is connected with the aqueous red mud outlet of filter 2.
Mixing device 4 is used to red mud and reduction coal being well mixed, provided with dry red mud entrance, reduction coal entrance and mixing
Material outlet, dries red mud entrance and is connected with the drying red mud outlet of the first drying unit 3.
Press ball device 5 is used to prepare pelletizing, is exported provided with compound entrance and pelletizing, compound entrance and mixing device 4
Compound outlet be connected.
Second drying unit 6 is used to dry pelletizing provided with pelletizing entrance and dries pelletizing outlet, and pelletizing entrance is filled with pressure ball
The pelletizing outlet for putting 5 is connected.
Reduction apparatus 7 is used to reduce red mud, prepares metallized pellet.Reduction apparatus 7, which is provided with, dries pelletizing entrance and metal
Pellet is exported, and is dried pelletizing entrance and is connected with the drying pelletizing outlet 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
Exemplary, its desirable number range is as shown in foregoing summary.Detection method used in following embodiments is one's own profession
The conventional detection method of industry.
Embodiment 1
The present embodiment prepares metallized pellet using the technological process shown in Fig. 1 and the system shown in Fig. 2, specific as follows：
The present embodiment is using the red mud slurry produced in Bayer process alumina producing, and its water content is 35%.It is sent to
In agitator treating device 1, the calcium oxide for adding equivalent butt red mud quality 5% stirs, and adds 100 DEG C of hot water progress
Washing.
Red mud after washing is settled, is filtered in feeding filter 2, obtains 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 carried out
Dry, obtain and dry red mud.TFe28.65% in red mud, CaO10.27%, Na2O1.62%.
It will dry and be well mixed in red mud and reduction coal feeding mixing device 4, and obtain compound.The addition of reduction coal is
The 22% of butt red mud quality.
Feed the mixture into press ball device 5, be prepared into pelletizing, and will be dried in pelletizing the second drying unit 6 of feeding, obtained
Pelletizing must be dried.
It will dry and be reduced directly in pelletizing feeding reduction apparatus 7, and obtain the metallized pellet of degree of metalization 90%.
Embodiment 2
The present embodiment prepares metallized pellet using the technological process shown in Fig. 1 and the system shown in Fig. 2, specific as follows：
The present embodiment is using the red mud slurry produced in Bayer process alumina producing, and its water content is 35%.It is sent to
In agitator treating device 1, the calcium oxide for adding equivalent butt red mud quality 15% stirs, and adds 80 DEG C of hot water progress
Washing.
Red mud after washing is settled, is filtered in feeding filter 2, obtains 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 carried out
Dry, obtain and dry red mud.TFe27.19% in red mud, CaO11.36%, Na2O1.08%.
It will dry and be well mixed in red mud and reduction coal feeding mixing device 4, and obtain compound.The addition of reduction coal is
The 20% of butt red mud quality.
Feed the mixture into press ball device 5, be prepared into pelletizing, and will be dried in pelletizing the second drying unit 6 of feeding, obtained
Pelletizing must be dried.
It will dry and be reduced directly in pelletizing feeding reduction apparatus 7, and obtain the metallized pellet of degree of metalization 91%.
Embodiment 3
The present embodiment prepares metallized pellet using the technological process shown in Fig. 1 and the system shown in Fig. 2, specific as follows：
The present embodiment is using the red mud slurry produced in Bayer process alumina producing, and its water content is 35%.It is sent to
In agitator treating device 1, the calcium oxide for adding equivalent butt red mud quality 3% stirs, and adds 100 DEG C of hot water progress
Washing.
Red mud after washing is settled, is filtered in feeding filter 2, obtains 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 carried out
Dry, obtain and dry red mud.TFe30.63% in red mud, CaO8.76%, Na2O2.17%.
It will dry and be well mixed in red mud and reduction coal feeding mixing device 4, and obtain compound.The addition of reduction coal is
The 10% of butt red mud quality.
Feed the mixture into press ball device 5, be prepared into pelletizing, and will be dried in pelletizing the second drying unit 6 of feeding, obtained
Pelletizing must be dried.
It will dry and be reduced directly in pelletizing feeding reduction apparatus 7, and obtain the metallized pellet of degree of metalization 88%.
Embodiment 4
The present embodiment prepares metallized pellet using the technological process shown in Fig. 1 and the system shown in Fig. 2, specific as follows：
The present embodiment is using the red mud slurry produced in Bayer process alumina producing, and its water content is 35%.It is sent to
In agitator treating device 1, the calcium oxide for adding equivalent butt red mud quality 20% stirs, and the hot water of 100 DEG C of addition enters
Row washing.
Red mud after washing is settled, is filtered in feeding filter 2, obtains 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 carried out
Dry, obtain and dry red mud.TFe26.97% in red mud, CaO18.21%, Na2O1.09%.
It will dry and be well mixed in red mud and reduction coal feeding mixing device 4, and obtain compound.The addition of reduction coal is
The 30% of butt red mud quality.
Feed the mixture into press ball device 5, be prepared into pelletizing, and will be dried in pelletizing the second drying unit 6 of feeding, obtained
Pelletizing must be dried.
It will dry and be reduced directly in pelletizing feeding reduction apparatus 7, and obtain the metallized pellet of degree of metalization 89%.
It was found from above-described embodiment, the degree of metalization using technique metallized pellet as made from red mud of the present invention is high.
To sum up, the present invention can not only promote the sedimentation of red mud by adding calcium oxide during laterite washing, also have
Beneficial 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.
Calcium oxide is added in washing process reduce 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 follow-up Direct Reduction
Improve pelletizing degree of metalization.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and not to embodiment
Limit.For those of ordinary skill in the field, other multi-forms can also be made on the basis of the above description
Change or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is apparent
Change or change still in protection scope of the present invention among.
Claims (6)
1. a kind of method that utilization red mud prepares metallized pellet, it is characterised in that comprise the following steps：
Red mud, calcium oxide, 80 DEG C~100 DEG C of hot water are well mixed, the red mud is washed；
Red mud after washing is settled, filtered, aqueous red mud and filtrate is obtained；
The aqueous red mud is dried, obtains and dries red mud；
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 characterised in that the addition of the calcium oxide is butt red mud quality
3%~20%.
3. method according to claim 2, it is characterised 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 characterised in that the addition of the reduction coal is butt red mud quality
10%~30%.
5. the system that any methods described prepares metallized pellet in a kind of use claim 1-4, it is characterised in that including：
Agitator treating device, provided with red mud entrance, calcium oxide entrance, hot water inlet and discharging opening；
Filter, provided with charging aperture, the outlet of aqueous red mud and filtrate (liquid, the charging aperture and the agitator treating device
Discharging opening is connected；
First drying unit, provided with aqueous red mud entrance and dry red mud outlet, the aqueous red mud entrance is filled with the filtering
The aqueous red mud outlet put is connected；
Mixing device, provided with drying red mud entrance, reduction coal entrance and compound outlet, the dry red mud entrance and described the
The drying red mud outlet of one drying unit is connected；
Press ball device, is exported, the compound of the compound entrance and the mixing device goes out provided with compound entrance and pelletizing
Mouth is connected；
Second drying unit, provided with pelletizing entrance and dry pelletizing outlet, the pelletizing of the pelletizing entrance and the press ball device
Outlet is connected；
Reduction apparatus, provided with pelletizing entrance and metallized pellet outlet is dried, the dry pelletizing entrance is dried with described second
The drying pelletizing outlet of device is connected.
6. system according to claim 5, it is characterised in that the reduction apparatus includes rotary hearth furnace, rotary kiln or tunnel
Kiln.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN107083478A true CN107083478A (en) | 2017-08-22 |
| CN107083478B 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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