CN107058726A - The pelletizing system and pelletizing process of a kind of metallized pellet - Google Patents
The pelletizing system and pelletizing process of a kind of metallized pellet Download PDFInfo
- Publication number
- CN107058726A CN107058726A CN201710380744.4A CN201710380744A CN107058726A CN 107058726 A CN107058726 A CN 107058726A CN 201710380744 A CN201710380744 A CN 201710380744A CN 107058726 A CN107058726 A CN 107058726A
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- Prior art keywords
- entrance
- pelletizing
- tailings
- mud
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- 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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- 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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses the pelletizing system and pelletizing process of a kind of metallized pellet.The system includes mixing device, provided with the outlet of carbonaceous material entrance, additive entrance and compound；Size mixing device, provided with iron content tailings entrance and tailings slurry outlet；Agitating device, is exported, tailings mud entrance is connected with the tailings slurry outlet of size mixing device provided with tailings mud entrance and pressurized mud；The pressurized mud outlet of agitating device is provided with pressure-applying unit；Palletizing device, provided with the outlet of compound entrance, pressurized mud entrance and carbonaceous pelletizing, compound entrance is connected with the compound outlet of mixing device, and pressurized mud entrance is connected with the pressurized mud outlet of agitating device；Reduction apparatus, is exported provided with carbonaceous pelletizing entrance and metallized pellet, and carbonaceous pelletizing entrance is connected with the carbonaceous pelletizing outlet of palletizing device.The present invention carries out pelletizing by spraying into the method for aqueous tailings pelletizing, and the addition for preparing carbonaceous pelletizing forming process reclaimed water can be greatly reduced.
Description
Technical field
The invention belongs to metallurgical and energy technology field, and in particular to a kind of pelletizing system of metallized pellet and pelletizing side
Method.
Background technology
Coal base pelletizing Direct Reduction Technology is to be made to contain after iron-bearing material is well mixed by a certain percentage with carbon raw material
Carbon pellets, are reduced ferriferous oxide in carbon raw material by the interior form with carbon.The preparation method of wherein carbonaceous pelletizing mainly has
Two kinds of pelletizing and pressure ball.
Coloured or smelting iron and steel aqueous tailings is typically all stored up or recycled after filtering, and direct-reduction handles these
, it is necessary to be dried to iron-bearing material during raw material, then mixed with other raw materials, add water progress pelletizing or pressure ball.In industry
Need first to be filtered substantial amounts of water during changing the aqueous tailings of processing, dry, substantial amounts of energy is expended in drying course
Source.Raw material after drying will will add water and be mixed with reducing agent, additive, in addition it is also necessary to add substantial amounts of water.In whole flow process
In water in aqueous tailings first to remove and add again, during consume the substantial amounts of energy, water resource.
The content of the invention
The method that the present invention sprays pelletizing using aqueous tailings, directly carries out the preparation of carbonaceous pelletizing using aqueous tailings,
Tailings need not again be dried, the pretreatment such as levigate, the uniform carbonaceous pelletizing of batch mixing can be obtained, be used directly for straight
Connect reduction.
The invention provides a kind of pelletizing system of metallized pellet, including：
Mixing device, provided with the outlet of carbonaceous material entrance, additive entrance and compound；
Size mixing device, provided with iron content tailings entrance and tailings slurry outlet；
Agitating device, is exported provided with tailings mud entrance and pressurized mud, the tailings mud entrance and the dress of sizing mixing
The tailings slurry outlet put is connected；
The pressurized mud outlet of the agitating device is provided with pressure-applying unit；
Palletizing device, provided with the outlet of compound entrance, pressurized mud entrance and carbonaceous pelletizing, the compound entrance and institute
The compound outlet for stating mixing device is connected, and the pressurized mud entrance is connected with the pressurized mud outlet of the agitating device；
Reduction apparatus, is exported provided with carbonaceous pelletizing entrance and metallized pellet, the carbonaceous pelletizing entrance and the pelletizing
The carbonaceous pelletizing outlet of device is connected.
In some embodiments of the invention, the mixing device also includes binding agent entrance.
Present invention also offers a kind of method that utilization said system prepares metallized pellet, comprise the following steps：
Carbonaceous material and additive are sent into the mixing device, compound is obtained after being well mixed；
The compound is sent into pelletizing is carried out in the palletizing device, obtain mother bulb；
Iron content tailings is sent into the size mixing device and sized mixing, the concentration of the control iron content tailings 30wt%~
70wt%, obtains tailings mud；
The tailings mud is sent into the agitating device and stirred, and is pressurizeed, pressurized mud is obtained；
The pressurized mud is sent into the palletizing device, and is uniformly ejected on the mother bulb, secondary pelletizing is carried out,
Obtain carbonaceous pelletizing；
The carbonaceous pelletizing is sent into the reduction apparatus and reduced, metallized pellet is obtained.
In some embodiments of the invention, the concentration of the tailings mud is 35wt%~65wt%.
In some embodiments of the invention, the concentration of the tailings mud is 40wt%~60wt%.
In some embodiments of the invention, diameter≤3mm of the mother bulb.
In some embodiments of the invention, binding agent is sent into the mixing device, with the carbonaceous material, described add
Plus agent prepares the compound.
In some embodiments of the invention, the carbonaceous material, the additive, the mass ratio of the binding agent are
(10~30)：(1~15)：(0~10).
In some embodiments of the invention, the mass ratio of the pressurized mud and the mother bulb is (1-1.5):1.
In some embodiments of the invention, the binding agent is starch or bentonite.
In some embodiments of the invention, the carbonaceous material is one kind in anthracite, coke powder or semi-coke.
In some embodiments of the invention, the additive is lime stone or dolomite.
The present invention carries out pelletizing by spraying into the method for aqueous tailings pelletizing, can directly utilize aqueous tailings, it is not necessary to
The processing of step such as filtered, dried, being crushed to aqueous tailings again.
The present invention can be such that tailings is uniformly closed very much with carbon raw material using the method for sprinkling, mitigate early stage batch mixing burden, carry
High batch mixing efficiency.
The addition for preparing carbonaceous pelletizing forming process reclaimed water can be greatly reduced in the present invention.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in a kind of metallized pellet pelletizing system structural representation；
Fig. 2 is a kind of process chart for preparing metallized pellet in the embodiment of the present invention.
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 pelletizing system for the metallized pellet that the present invention is provided includes mixing device 1, size mixing device 2, stirred
Mix device 3, palletizing device 4 and reduction apparatus 5.
Mixing device 1 is used to mix carbonaceous material and additive, provided with carbonaceous material entrance, additive entrance and compound
Outlet.Binding agent entrance is additionally provided with mixing device 1 shown in Fig. 1, can be without bonding when mixed material is cementitious
Agent, now mixing device 1 can be without setting binding agent entrance.
Size mixing device 2 is used for the moisture for adjusting iron content tailings, provided with iron content tailings entrance and tailings slurry outlet.
Agitating device 3 is used to stir in tailings mud, and to pressure slurry.Agitating device 3 enters provided with tailings mud
Mouth and pressurized mud outlet, tailings mud entrance are connected with the tailings slurry outlet of size mixing device 2；The pressurization mud of agitating device 3
Slurry outlet is provided with pressure-applying unit.
Palletizing device 4 is used to be molded, and provided with the outlet of compound entrance, pressurized mud entrance and carbonaceous pelletizing, compound enters
Mouth is connected with the compound outlet of mixing device 1, and pressurized mud entrance is connected with the pressurized mud outlet of agitating device 3.
It is metallized pellet that reduction apparatus 5, which is used for Reduction of Pellet Containing Coal Char, provided with carbonaceous pelletizing entrance and metallized pellet
Outlet, carbonaceous pelletizing entrance is connected with the carbonaceous pelletizing outlet of palletizing device 4.
As shown in Fig. 2 the present invention provides the method that metallized pellet is prepared using said system, comprise the following steps：
By carbonaceous material and additive feeding mixing device 1, compound is obtained after being well mixed；
Feed the mixture into and pelletizing is carried out in palletizing device 4, obtain mother bulb；
Iron content tailings is sent into size mixing device 2 and sized mixing, tailings mud is obtained；
It will stir, and pressurizeed in tailings mud agitating device 3, obtain pressurized mud；
Pressurized mud is sent into palletizing device 4, and is uniformly ejected on mother bulb, secondary pelletizing is carried out with compound, obtains
Obtain carbonaceous pelletizing；
Carbonaceous pelletizing is sent into reduction apparatus 5 and reduced, metallized pellet is obtained.
The iron content tailings that the present invention is used is the aqueous tailings after metal smelting.Coloured or smelting iron and steel tailings includes red
The aqueous iron-bearing materials such as copper ashes, steel mill sludge after mud, the lead cadmia of hydrometallurgy, pyrometallurgical smelting after dilution.Coloured or steel
Aqueous tailings during iron is smelted typically just will can be stored up or use after the steps such as press filtration, and pelletizing process of the invention is directly sharp
Pelletizing is carried out with aqueous secondary tailings, press filtration step above is saved, and need not additionally add in follow-up balling process
Water, saves water consumption.
In balling process, pelletizing is carried out using carbonaceous material as mother bulb, during reduction, the carbon gasification of kernel,
Through the mud of outer layer, pelletizing stomata can be increased, be conducive to the progress of reduction reaction.The CO of gasification can be gone back with iron simultaneously
Original, improves reduction effect.In the preferred embodiment of the invention, carbonaceous material is one kind in anthracite, coke powder or semi-coke.
Using the method for sprinkling tailings can be made uniformly to be closed very much with carbon raw material, mitigate early stage batch mixing burden, improve batch mixing
Efficiency.
In Fig. 2, binding agent is also added when preparing compound., can be without binding agent if mixed material has caking property.
In the preferred embodiment of the invention, binding agent is starch or bentonite.In the preferred embodiment of the invention, additive is stone
Lime stone or dolomite.
Carbonaceous material, additive, the reduction effect of the mass ratio influence pelletizing of binding agent and the intensity of pelletizing.In the present invention
In preferred embodiment, carbonaceous material, additive, the mass ratio of binding agent are (10~30)：(1~15)：(0~10).
The concentration of mud is larger to the intensity effect of final obtained carbonaceous pelletizing, and concentration is too high, the knot of mud and mother bulb
Close intensity difference；Concentration is too low, and mud can not be bonded on mother bulb.In the present invention, control tailings mud concentration 30wt%~
Between 70wt%.Preferably, the concentration of tailings mud is 35wt%~65wt%.It is highly preferred that the concentration of tailings mud is
40wt%~60wt%.
The diameter of mother bulb is too big, and pelletizing is relatively difficult.In the preferred embodiment of the invention, diameter≤3mm of mother bulb.
The mass ratio of pressurized mud and mother bulb directly affects the intensity of gained carbonaceous pelletizing.In the preferred embodiment of the invention
In, the mass ratio of pressurized mud and mother bulb is (1-1.5):1.
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
Metallized pellet is prepared using the technological process shown in the system and Fig. 2 shown in Fig. 1, it is specific as follows：
The iron content tailings that the present embodiment is used is red mud mud, and concentration is 60wt%, is sent in size mixing device 2 and carries out
Size mixing, obtain the tailings mud that concentration is 30wt%.It will stir, and pressurizeed in tailings mud agitating device 3, obtained
Pressurized mud, pressure is 60kg/cm2。
The carbonaceous material that the present embodiment is used is anthracite, and additive is lime stone.Anthracite and lime stone feeding is mixed
Expect device 1, be 25 according to mass ratio:10 ratio is well mixed, and obtains compound.Feed the mixture into palletizing device 4
Row pelletizing, obtains a diameter of 2mm or so mother bulb.
Pressurized mud is sent into palletizing device 4, and is uniformly ejected on mother bulb, secondary pelletizing is carried out with compound, obtains
Obtain carbonaceous pelletizing.The weight of compound of the addition of pressurized mud with adding is identical.
Carbonaceous pelletizing is sent into reduction apparatus 5 and reduced, metallized pellet is obtained.
By detection, the average pelletizing of carbonaceous pelletizing is dry, wet bulb drop strength ＞ 8 times.
Embodiment 2
Metallized pellet is prepared using the technological process shown in the system and Fig. 2 shown in Fig. 1, it is specific as follows：
The iron content tailings that the present embodiment is used is copper ashes mud, and concentration is 65wt%, is sent in size mixing device 2 and carries out
Size mixing, obtain the tailings mud that concentration is 40wt%.It will stir, and pressurizeed in tailings mud agitating device 3, obtained
Pressurized mud, pressure is 90kg/cm2。
The carbonaceous material that the present embodiment is used is coke powder, and additive is lime stone, and binding agent is starch.By coke powder, lime
Stone and starch feeding mixing device 1, are 30 according to mass ratio：10：3 ratio is well mixed, and obtains compound.Compound is sent
Enter and pelletizing is carried out in palletizing device 4, obtain a diameter of 3mm or so mother bulb.
Pressurized mud is sent into palletizing device 4, and is uniformly ejected on mother bulb, secondary pelletizing is carried out, obtains and contains carbon ball
Group.The addition of pressurized mud is 1.2 times of the compound weight added.
Carbonaceous pelletizing is sent into reduction apparatus 5 and reduced, metallized pellet is obtained.
By detection, the average pelletizing of carbonaceous pelletizing is dry, wet bulb drop strength ＞ 10 times.
Embodiment 3
Metallized pellet is prepared using the technological process shown in the system and Fig. 2 shown in Fig. 1, it is specific as follows：
The iron content tailings that the present embodiment is used is lead cadmia mud, and concentration is 60wt%, is sent in size mixing device 2 and carries out
Size mixing, obtain the tailings mud that concentration is 70wt%.It will stir, and pressurizeed in tailings mud agitating device 3, obtained
Pressurized mud, pressure is 200kg/cm2。
The carbonaceous material that the present embodiment is used is semi-coke, and additive is dolomite, and binding agent is bentonite.By semi-coke, in vain
Marble and bentonite feeding mixing device 1, are 28 according to mass ratio：5：5 ratio is well mixed, and obtains compound.Will mixing
Pelletizing is carried out in material feeding palletizing device 4, a diameter of 2mm or so mother bulb is obtained.
Pressurized mud is sent into palletizing device 4, and is uniformly ejected on mother bulb, secondary pelletizing is carried out, obtains and contains carbon ball
Group.The addition of pressurized mud is add compound weight 1.5 times.
Carbonaceous pelletizing is sent into reduction apparatus 5 and reduced, metallized pellet is obtained.
By detection, the average pelletizing of carbonaceous pelletizing is dry, wet bulb drop strength ＞ 11 times.
It was found from above-described embodiment, carbonaceous pelletizing intensity produced by the present invention is high, crushes few in reduction process.
To sum up, the present invention carries out pelletizing by spraying into the method for aqueous tailings pelletizing, can directly utilize aqueous tailings, no
The processing of step such as need again to filter aqueous tailings, dry, crush.
The present invention can be such that tailings is uniformly mixed with carbon raw material using the method for sprinkling, mitigate early stage batch mixing burden, carry
High batch mixing efficiency.
The addition for preparing carbonaceous pelletizing forming process reclaimed water can be greatly reduced in the present invention.
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 (9)
1. a kind of pelletizing system of metallized pellet, it is characterised in that including：
Mixing device, provided with the outlet of carbonaceous material entrance, additive entrance and compound；
Size mixing device, provided with iron content tailings entrance and tailings slurry outlet；
Agitating device, is exported provided with tailings mud entrance and pressurized mud, the tailings mud entrance and the size mixing device
Tailings slurry outlet is connected；
The pressurized mud outlet of the agitating device is provided with pressure-applying unit；
Palletizing device, provided with the outlet of compound entrance, pressurized mud entrance and carbonaceous pelletizing, the compound entrance is mixed with described
Expect that the compound outlet of device is connected, the pressurized mud entrance is connected with the pressurized mud outlet of the agitating device；
Reduction apparatus, is exported provided with carbonaceous pelletizing entrance and metallized pellet, the carbonaceous pelletizing entrance and the palletizing device
Carbonaceous pelletizing outlet be connected.
2. pelletizing system according to claim 1, it is characterised in that the mixing device also includes binding agent entrance.
3. the method that the pelletizing system described in a kind of utilization claim 1 or 2 prepares metallized pellet, it is characterised in that including
Following steps：
Carbonaceous material and additive are sent into the mixing device, compound is obtained after being well mixed；
The compound is sent into pelletizing is carried out in the palletizing device, obtain mother bulb；
Iron content tailings is sent into the size mixing device and sized mixing, the concentration of the control iron content tailings 30wt%~
70wt%, obtains tailings mud；
The tailings mud is sent into the agitating device and stirred, and is pressurizeed, pressurized mud is obtained；
The pressurized mud is sent into the palletizing device, and is uniformly ejected on the mother bulb, is carried out with the compound
Secondary pelletizing, obtains carbonaceous pelletizing；
The carbonaceous pelletizing is sent into the reduction apparatus and reduced, metallized pellet is obtained.
4. method according to claim 3, it is characterised in that the concentration of the tailings mud is 35wt%~65wt%.
5. method according to claim 3, it is characterised in that the concentration of the tailings mud is 40wt%~60wt%.
6. method according to claim 3, it is characterised in that diameter≤3mm of the mother bulb.
It is and described carbon containing 7. method according to claim 3, it is characterised in that binding agent is sent into the mixing device
Material, the additive prepare the compound.
8. method according to claim 7, it is characterised in that the carbonaceous material, the additive, the binding agent
Mass ratio is (10~30)：(1~15)：(0~10).
9. method according to claim 3, it is characterised in that the mass ratio of the pressurized mud and the mother bulb is (1-
1.5):1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380744.4A CN107058726A (en) | 2017-05-25 | 2017-05-25 | The pelletizing system and pelletizing process of a kind of metallized pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710380744.4A CN107058726A (en) | 2017-05-25 | 2017-05-25 | The pelletizing system and pelletizing process of a kind of metallized pellet |
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| Publication Number | Publication Date |
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| CN107058726A true CN107058726A (en) | 2017-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710380744.4A Pending CN107058726A (en) | 2017-05-25 | 2017-05-25 | The pelletizing system and pelletizing process of a kind of metallized pellet |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06172837A (en) * | 1992-12-07 | 1994-06-21 | Nippon Steel Corp | Circulating fluidized reduction method of powdery ore |
| JP2000054014A (en) * | 1998-07-31 | 2000-02-22 | Nkk Corp | Device for charging ore in smelting reduction equipment |
| CN205907322U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN206828603U (en) * | 2017-05-25 | 2018-01-02 | 江苏省冶金设计院有限公司 | A kind of pelletizing system of metallized pellet |
-
2017
- 2017-05-25 CN CN201710380744.4A patent/CN107058726A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06172837A (en) * | 1992-12-07 | 1994-06-21 | Nippon Steel Corp | Circulating fluidized reduction method of powdery ore |
| JP2000054014A (en) * | 1998-07-31 | 2000-02-22 | Nkk Corp | Device for charging ore in smelting reduction equipment |
| CN205907322U (en) * | 2016-08-01 | 2017-01-25 | 江苏省冶金设计院有限公司 | System for handle red mud |
| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN206828603U (en) * | 2017-05-25 | 2018-01-02 | 江苏省冶金设计院有限公司 | A kind of pelletizing system of metallized pellet |
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