CN207877828U - A kind of ferrochrome pelletizing production system - Google Patents
A kind of ferrochrome pelletizing production system Download PDFInfo
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- CN207877828U CN207877828U CN201721471486.2U CN201721471486U CN207877828U CN 207877828 U CN207877828 U CN 207877828U CN 201721471486 U CN201721471486 U CN 201721471486U CN 207877828 U CN207877828 U CN 207877828U
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- discharge port
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- feeding mouth
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Abstract
The utility model discloses a kind of ferrochrome pelletizing production systems, including the first feeding device, the second feeding device, humidifier, ball-milling device, mixing device and palletizing device, wherein, first feeding device includes chromite storage bin, carbon containing reducer storage bin and binder storage bin, and the feeding mouth of the discharge port of the first feeding device and ball-milling device connects；Second feeding device includes SILICA FUME storage bin, and the feeding mouth of the discharge port of the second feeding device and humidifier connects；The discharge port of humidifier and the feeding mouth of mixing device connect；The discharge port of ball-milling device and the feeding mouth of mixing device connect；The discharge port of mixing device and the feeding mouth of palletizing device connect.The system is logical not only to have achieved the purpose that metallurgical dust comprehensive utilization of resources, further improves chromite pelletizing condition of molding, the dry pellet strength of chromite is made to significantly improve.
Description
Technical field
The utility model is related to ferroalloy smelting technical field more particularly to a kind of ferrochrome pelletizing lifes for direct-reduction
Production system.
Background technology
Chromite smelting carries out generally in mineral hot furnace, traditional smelting process be by ferrochrome lump ore and silica, lime stone,
The problems such as coke is directly added into mineral hot furnace and is smelted, but power consumption is big, of high cost is more prominent.In order to reduce smelting cost, chromium
Iron manufacturing enterprise can be produced instead of lump ore as raw material using the cheap fine ore in part, however, powder during smelting ferrochrome
Mine can excessively make furnace charge air permeability be deteriorated, and the working of a furnace deteriorates, turns over slag, seriously affects every technical-economic index.In recent years, in order to drop
Low ferrochrome production cost, has carried out a large amount of research work both at home and abroad, has developed chromite powder, silica, coke and glues
Knot agent is mixed and made into pelletizing and carries out prereduction, then uses the production technology of mine heat furnace smelting ferrochrome or electric furnace DIRECT ALLOYING again.
However, chromite has chromohercynite structure, compact structure, wetability is poor, and the dry bulb intensity that pelletizing is made is low, Yi Fen
It is broken, it is easy to cause harmful effect to production link, production efficiency is caused to reduce.
SILICA FUME is that a large amount of very strong SiO of volatility are generated in mineral hot furnace in smelting duriron or industrial silicon2With Si gas
Body is met the condensation of air rapid oxidation and is precipitated after discharge, main component SiO2.Dioxide-containing silica is more than in SILICA FUME
95%, remaining insufficient 5% predominantly carbon and other trace impurities.SILICA FUME average grain diameter is at 0.15-0.20 μm, specific surface
Product is 20000-28000m2It is very big to recycle difficulty since its granularity is small, light weight by/kg.Therefore, can all have every year a large amount of
SILICA FUME accumulation, result in waste of resources.Blowing and raining is met, which will float through wind-force forms haze to aerial, or through rain
Water, which is washed away into underground, directly affects water quality, causes seriously to pollute to environment, needs the later stage that a large amount of fund is spent to go to tie up
Hold the management of SILICA FUME.
Therefore, how to improve pellet strength and rationally utilize SILICA FUME urgently to be resolved hurrily as ferrochrome field of smelting
Technical problem.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of ferrochrome pelletizing production systems for direct-reduction.
The system replaces silica during preparing ferrochrome pelletizing with appropriate SILICA FUME, while reaching dust comprehensive utilization of resources and changing
The purpose of the dry pellet strength of kind ferrochrome.
According to a kind of ferrochrome Pellet production method of the utility model, comprise the steps of：
Step 1：By chromite, carbon containing reducer and binder according to 100：20-40：Ball is sent into the mass ratio mixing of 3-6
Mixture is made in mill apparatus；
Step 2：It is 8%-15% that SILICA FUME, which is sent into humidification to water content in humidifier,；
Step 3：By mixture with the SILICA FUME after humidification according to 100：The mass ratio of 8-15 is sent into mixing device and is mixed
Uniformly；
Step 4：Mixture obtained by step 3 is sent into palletizing device and carries out pelletizing, the chromium that grain size is 8-20mm is made
Iron wet bulb group, and further drying obtains the ferrochrome dry bulb group that water content is less than 2%.
Further, the mass ratio of chromite, carbon containing reducer and binder is 100 in step 1： 25-35：4-5.
Further, carbon containing reducer is coke or semicoke.
Further, binder is bentonite or starch.
Further, the molar ratio of the oxygen content of oxide is C/O=in the phosphorus content of carbon containing reducer and chromite
1.2-1.8。
Further, SiO in SILICA FUME2Content is more than 90%.
Further, mixture meets the granularity of at least 80% particle less than 74 μm.
Further, step 2 is 10%-12% comprising humidifying SILICA FUME to water content
According to the utility model a kind of ferrochrome pelletizing production system, comprising the first feeding device, the second feeding device, add
Wet device, ball-milling device, mixing device and palletizing device, wherein
First feeding device includes chromite storage bin, carbon containing reducer storage bin and binder storage bin, and first
The discharge port of feeding device and the feeding mouth of ball-milling device connect；
Second feeding device includes SILICA FUME storage bin, and the pan feeding of the discharge port of the second feeding device and humidifier
Mouth connection；
The discharge port of humidifier and the feeding mouth of mixing device connect；
The discharge port of ball-milling device and the feeding mouth of mixing device connect；
The discharge port of mixing device and the feeding mouth of palletizing device connect.
Further, include the first belt weighing of the feeding mouth of the discharge port and ball-milling device of the first feeding device of connection
Device connects the second conveyer belt scale of the discharge port of ball-milling device and the feeding mouth of mixing device, and connection humidification dress
The third conveyer belt scale of the feeding mouth of the discharge port and mixing device set.
It is used in technical solution, the utility model, with addition of SILICA FUME, has not only reached smelting in chromite balling process
The purpose of bronze dust resources comprehensive utilization, further improves chromite pelletizing condition of molding, the dry pellet strength of chromite is made obviously to carry
Height improves pelletizing in the crushing phenomenon of production link, and due to need not add silica, reduces the broken milling work of silica
Skill process, thus reduce energy consumption.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model from the following description of the accompanying drawings of embodiments will
It becomes apparent and is readily appreciated that, wherein：
Fig. 1 is the schematic diagram of the exemplary ferrochrome pelletizing production system according to the utility model；
Fig. 2 is the flow chart of the exemplary ferrochrome Pellet production method according to the utility model.
Reference sign：
1 first feeding device, 2 second feeding devices, 3 humidifiers, 4 ball-milling devices, 5 mixing devices, 6 palletizing devices, 7
First conveyer belt scale, 8 second conveyer belt scales, 9 third conveyer belt scales.
Specific implementation mode
The embodiments of the present invention are described below in detail, the example of embodiment is shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the utility model, and should not be understood as limiting the present invention.
Ferrochrome Pellet production method according to the utility model is based on SILICA FUME grain size small (0.15 μm -0.20 μm), compares table
Big (the 20000m of area2/kg-28000m2/ kg), the big feature of surface-active, improve the balling property of chromite, obtained compared with
The ferrochrome dry bulb group of eager to do well in everything degree, reduces the degradation rate of production process pelletizing, achievees the effect that improve production efficiency；Use SILICA FUME
Instead of silica, reduces the process procedure of the broken milling of silica, reached energy-saving advantageous effect.
Ferrochrome Pellet production method is implemented using ferrochrome pelletizing production system shown in FIG. 1.The ferrochrome pelletizing production system
Overall system includes the first feeding device 1, the second feeding device 2, humidifier 3, ball-milling device 4, mixing device 5, palletizing device
6, the first conveyer belt scale 7, the second conveyer belt scale 8 and third conveyer belt scale 9.
First feeding device 1 includes chromite storage bin, carbon containing reducer storage bin and binder storage bin, is respectively used to
Chromite, carbon containing reducer and binder are stored and discharge, the discharge port of first feeding device 1 passes through the first belt weighing
Device 7 is connect with the feeding mouth of ball-milling device 4, so that the chromite of specified weight ratio, carbon containing reducer and binder to be sent into
Mixture is prepared in ball-milling device 4.
Second feeding device 2 includes SILICA FUME storage bin, for storing and discharging SILICA FUME, second feeding device 2
Discharge port is connect with the feeding mouth of humidifier 3, to carry out humidification process to dry SILICA FUME, avoids it from generating airborne dust dirty
Dye.
The discharge port of ball-milling device 4 and the discharge port of humidifier 3 pass through the second conveyer belt scale 8 and third skin respectively
It is connect with the feeding mouth of mixing device 5 with weighing device 9, so that the SILICA FUME of the mixture of specified weight ratio and humidification to be sent into
It is uniformly mixed in mixing device 5.
The feeding mouth of palletizing device 6 is connect with the discharge port of mixing device 5, for regulation to be made in the material being uniformly mixed
The ferrochrome pelletizing of size.
Specifically, as shown in Fig. 2, the ferrochrome Pellet production method according to the utility model can comprise the following steps：
Step 1：The chromite, carbon containing reducer and the binder that are stored in the first feeding device 1 are passed through into the first belt
Weighing device 7 is according to 100：20-40：The granularity for the particle for being made at least 80% is sent into ball-milling device 4 in the mass ratio mixing of 3-6
Mixture less than 74 μm, wherein the mass ratio of chromite, carbon containing reducer and binder is preferably 100：25-35：4-5；
Carbon containing reducer can select coke or semicoke, binder that can select bentonite or starch, wherein carbon containing to go back
The molar ratio of the oxygen content of oxide is preferably C/O=1.2-1.8 in the phosphorus content and chromite of former agent.
Step 2：The SiO in the second feeding device 2 will be stored in2SILICA FUME of the content more than 90% is sent into humidifier 3
Middle humidification to water content is 8%-15%, preferably 10%-12%, wherein water content refers to moisture and accounts for the SILICA FUME after humidification
Mass fraction.SILICA FUME fine size, light weight easy to produce dust pollution, while causing resources loss, and humidification process can be effective
Less SILICA FUME airborne dust, amount of water is too small, and the effect for reducing airborne dust is small, and amount of water is excessive, causes seriously to be bonded, follow-up batch mixing is not
Situations such as uniform
Step 3：Mixture and the SILICA FUME after humidification are claimed by third conveyer belt scale 8 and the 4th belt respectively
Refitting sets 9 according to 100：The mass ratio of 8-15 is sent into mixing device 5 and is uniformly mixed.SILICA FUME average grain diameter is in 0.15-0.20 μ
M, specific surface area 20000-28000m2/ kg has preferable surface-active, SILICA FUME is added in mixture, can significantly be increased
Add the effect of the intermolecular Van der Waals force of mixture, therefore can effectively improve the intensity of chromite pelletizing.
Step 4：Mixture obtained by step 3 is sent into palletizing device 6 and carries out pelletizing, the chromium that grain size is 8-20mm is made
Iron ball group, and further drying obtains the ferrochrome dry bulb group that water content is less than 2%.
Embodiment 1
The ferrochrome Pellet production method of the utility model embodiment 1, comprises the steps of：
Step 1：It is 41.4%Cr by ingredient2O3, 12.5%FeO, 2.9%Fe2O3Chromite, fixed carbon content be
83.16% coke and bentonite is according to 100：24：3 mass ratio mixing, which is sent into ball-milling device 4, is made granularity less than 74 μm
Particle be more than 80% mixture, wherein in the phosphorus content and chromite of coke the molar ratio of the oxygen content of oxide be C/O
=1.2.
Step 2：By SiO2It is 8% that the SILICA FUME that content is 94.6%, which is sent into humidification to water content in humidifier 3,.
Step 3：By mixture with the SILICA FUME after humidification according to 100：8 mass ratio is sent into mixing device 5 and is mixed
It is even.
Step 4：Mixture obtained by step 3 is sent into palletizing device 6 and carries out pelletizing, the ferrochrome that grain size is 8mm is made
Pelletizing, and further drying obtains the ferrochrome dry bulb group that water content is 0.5%.
Embodiment 2
The ferrochrome Pellet production method of the utility model embodiment 2, comprises the steps of：
Step 1：It is 43.1%Cr by ingredient2O3, 9.7%FeO, 2.6%Fe2O3Chromite, fixed carbon content be
78.86% semicoke and bentonite is according to 100：29.6：4 mass ratio mixing, which is sent into ball-milling device 4, is made granularity less than 74 μ
The particle of m is more than 90% mixture, wherein the molar ratio of the oxygen content of oxide is C/ in the phosphorus content and chromite of coke
O=1.8.
Step 2：By SiO2It is 12% that the SILICA FUME that content is 92.3%, which is sent into humidification to water content in humidifier 3,.
Step 3：By mixture with the SILICA FUME after humidification according to 100：10 mass ratio is sent into mixing device 5 and is mixed
Uniformly.
Step 4：Mixture obtained by step 3 is sent into palletizing device 6 and carries out pelletizing, the ferrochrome that grain size is 20mm is made
Pelletizing, and further drying obtains the ferrochrome dry bulb group that water content is 1%.
Embodiment 3
The ferrochrome Pellet production method of the utility model embodiment 3, comprises the steps of：
Step 1：It is 42.4%Cr by ingredient2O3, 12.7%FeO, 2.5%Fe2O3Chromite, fixed carbon content be
83.16% coke and starch is according to 100：32.1：5 mass ratio mixing, which is sent into ball-milling device 4, is made granularity less than 74 μm
Particle be more than 80% mixture, wherein in the phosphorus content and chromite of coke the molar ratio of the oxygen content of oxide be C/O
=1.5.
Step 2：By SiO2It is 12% that the SILICA FUME that content is 94.6%, which is sent into humidification to water content in humidifier 3,.
Step 3：By mixture with the SILICA FUME after humidification according to 100：12 mass ratio is sent into mixing device 5 and is mixed
Uniformly.
Step 4：Mixture obtained by step 3 is sent into palletizing device 6 and carries out pelletizing, the ferrochrome that grain size is 16mm is made
Pelletizing, and further drying obtains the ferrochrome dry bulb group that water content is 1.5%.
Embodiment 4
The ferrochrome Pellet production method of the utility model embodiment 4, comprises the steps of：
Step 1：It is 44.3%Cr by ingredient2O3, 10.2%FeO, 2.7%Fe2O3Chromite, fixed carbon content be
78.86% semicoke and starch is according to 100：38.1：6 mass ratio mixing, which is sent into ball-milling device 4, is made granularity less than 74 μm
Particle be more than 90% mixture, wherein in the phosphorus content and chromite of coke the molar ratio of the oxygen content of oxide be C/O
=1.6.
Step 2：By SiO2It is 8% that the SILICA FUME that content is 92.3%, which is sent into humidification to water content in humidifier 3,.
Step 3：By mixture with the SILICA FUME after humidification according to 100：15 mass ratio is sent into mixing device 5 and is mixed
Uniformly.
Step 4：Mixture obtained by step 3 is sent into palletizing device 6 and carries out pelletizing, the ferrochrome that grain size is 10mm is made
Pelletizing, and further drying obtains the ferrochrome dry bulb group that water content is 2%.
Drop strength test, test result such as table are carried out respectively to ferrochrome wet bulb group in above-described embodiment and ferrochrome dry bulb group
Shown in 1：
Table 1
Wherein, (1) comparative example 1-4 be respectively adopted chromite identical with embodiment 1-4, carbon containing reducer and binder with
The ferrochrome pelletizing of identical ratio mixture manufacturing, does not add SILICA FUME；
(2) pellet strength test method is：Wet bulb group/dry bulb group is freely fallen to the steel plate of 10mm thickness in 0.5m height
On, if being ruptured after falling n times, i.e., the drop strength of the ball is that (n-1) is secondary, surveys 10 green-balls every time, is averaged conduct
The drop strength of green-ball (unit is secondary).
Test result shows：Compared with the comparative example of unused compound binding agent, ferrochrome made of compound binding agent is used
The mean intensity of dry bulb group is significantly increased.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that：
Can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and objective, modification, replaced
And modification, the scope of the utility model are limited by claim and its equivalent.
Claims (2)
1. a kind of ferrochrome pelletizing production system, which is characterized in that comprising the first feeding device, the second feeding device, humidifier,
Ball-milling device, mixing device and palletizing device, wherein
First feeding device includes chromite storage bin, carbon containing reducer storage bin and binder storage bin, and described
The discharge port of first feeding device is connect with the feeding mouth of the ball-milling device；
Second feeding device includes SILICA FUME storage bin, and the discharge port of second feeding device is filled with the humidification
The feeding mouth connection set；
The discharge port of the humidifier is connect with the feeding mouth of the mixing device；
The discharge port of the ball-milling device is connect with the feeding mouth of the mixing device；
The discharge port of the mixing device is connect with the feeding mouth of the palletizing device.
2. ferrochrome pelletizing production system according to claim 1, which is characterized in that include connection first feeding device
Discharge port and the ball-milling device feeding mouth the first conveyer belt scale, connect discharge port and the institute of the ball-milling device
The second conveyer belt scale of the feeding mouth of mixing device is stated, and the discharge port of the connection humidifier is filled with the batch mixing
The third conveyer belt scale for the feeding mouth set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721471486.2U CN207877828U (en) | 2017-11-07 | 2017-11-07 | A kind of ferrochrome pelletizing production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721471486.2U CN207877828U (en) | 2017-11-07 | 2017-11-07 | A kind of ferrochrome pelletizing production system |
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| Publication Number | Publication Date |
|---|---|
| CN207877828U true CN207877828U (en) | 2018-09-18 |
Family
ID=63500829
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721471486.2U Active CN207877828U (en) | 2017-11-07 | 2017-11-07 | A kind of ferrochrome pelletizing production system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207877828U (en) |
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2017
- 2017-11-07 CN CN201721471486.2U patent/CN207877828U/en active Active
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