CN107282260B - A kind of pellet screening reuse method - Google Patents
A kind of pellet screening reuse method Download PDFInfo
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- CN107282260B CN107282260B CN201710594914.9A CN201710594914A CN107282260B CN 107282260 B CN107282260 B CN 107282260B CN 201710594914 A CN201710594914 A CN 201710594914A CN 107282260 B CN107282260 B CN 107282260B
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- mine
- pressure roller
- roller mill
- high pressure
- iron concentrate
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of pellet screening reuse methods, include the following steps：Collection is returned mine, and is transported after the collection that will return mine to returning mine in storehouse, is screened out bulk and iron alloy member；Qualification is prepared to return mine；Iron concentrate dispensing；Iron concentrate is dried；High pressure roller mill Iron concentrate；Iron concentrate after fine grinding enters strength mixture operation by conveying equipment；Prepare additive formulations；Profit mill；Pelletizing.The present invention is mainly to make full use of the existing device of production line, high pressure roller mill system is designed to time-division processing different material, advantage of the high-pressure roller mill in terms of stiff block is broken with Iron concentrate wet type fine grinding is played respectively, solve the problems, such as that pellet screening is difficult to recycle, meet the needs utilized again, material loss is greatly reduced, transport and processing cost are saved, good material treatment effect can be obtained, large number of equipment and technique building need not be increased newly again, investment cost is low, is convenient for large-scale popularization.
Description
Technical field
The present invention relates to pellet production fields, and in particular to a kind of technical method that pellet screening recycles.
Background technology
In ferrous metals industry, the iron ore agglomeration method of mainstream mainly has sintering process and pelletizing method, wherein pelletizing method
It is the iron ore concentrate molding for being to be suitble to granularity.Certain journey is inevitably generated in grate-kiln pelletizing ore production technology
Degree is returned mine, and predominantly green-ball sieves the bulk cargo generated in the process and return mine and (is referred to as returning in drying grate drying, preheating and finished product
Mine), hardness of returning mine is higher, particle is larger, it is difficult to be used for pelletizing method reproduction, generally return mine transport for sinter to this part
Production.Such processing mode increases material loss, and processing cost is higher.
It is learnt by retrieval, in order to reduce material loss, cost-effective, some enterprises, which will directly return mine, directly participates in iron essence
Powder dispensing is directly used in pellet production after profit is ground, but damp mill differs in the such particle size of processing, and hardness is obviously poor
When different material, poor processing effect, returning mine for many bulky grains is not broken, or it is broken after granularity it is still excessive, balling-up
Can be poor, directly affect the performance of pelletizing process production capacity.In view of the above problems, domestic certain pelletizing production enterprise uses Generalized Mill system
System is handled returning mine, and is subsequently used for pelletizing production, is achieved good effect.
With the continuous popularization and production domesticization of high pressure roller mill technology, large-scale domestic mine generally uses high-pressure roller mill to iron
Ore carries out break process, has accumulated certain use experience.Meanwhile high pressure roller mill handles Iron concentrate can increase iron
Fine powder specific surface area, improves Iron concentrate balling property, and high pressure roller mill has become the indispensability of domestic newly-built, reconstruction pellet production line
Equipment.How by knowhow of the high pressure roller mill in bargh for processing of returning mine, the balling property state returned mine with raising
It is interior generally to start research in this respect and industrial test not yet.
Damp mill is either used still to be handled that different degrees of there are some to returning mine with broad sense grinding system
Problem.First, damp mill differs handling such particle size, when material (Iron concentrate is returned mine) of hardness notable difference, processing
Effect is poor, and returning mine for many bulky grains is not broken, or broken rear granularity is still excessive, and balling property is poor, directly affects and makes
The performance of ball process production capacity.Second is that broad sense grinding system is complex, technique building and equipment are more, and floor space is larger, investment
Costly, equipment purposes is single, this several respects disadvantage limits promoting the use for such method.
Therefore, it is necessary to invent a kind of better pellet screening reuse method, improve pellet screening treatment effect, reduces
Material loss saves transport and processing cost, and construction cost is low, is convenient for large-scale popularization.
Invention content
To overcome the deficiency, under the premise of ensureing high intensity, a kind of pellet screening reuse method is provided.
The technical solution adopted by the present invention to solve the technical problems is：A kind of pellet screening reuse method, including with
Lower step：
Step 1：Collection is returned mine, and is transported to returning mine in storehouse, wherein returning mine as the bulk cargo of drying grate lower part after the collection that will return mine
The unqualified pellet two parts of granularity screened out with finished product screen, the first feed bin of returning mine is to collect bulk cargo and the feed bin returned mine；
Step 2：Bulk and iron alloy member are screened out, by returning mine by conveying equipment and meter under storehouse of returning mine in storehouse of returning mine
The metering of amount equipment conveys and carries out scalper and removes to go out except operation with iron content sundries；
Step 3：It prepares qualification to return mine, high pressure roller mill feed bin will be transported to by bulk, returning mine for iron content sundries removal,
Break process of returning mine is carried out using high pressure roller mill, broken return mine of high pressure roller mill is delivered to by conveying device on screening plant
It is sieved, broken return mine is divided into two kinds of materials of+3mm (i.e. grain size ＞ 3mm) and -3mm (i.e. grain size ＜ 3mm),
In+3mm it is broken after return mine and returned mine storehouse by conveying device, by the sequence progress closed-type high-pressure roller of step 1 to step 3
Mill cycle crushing operation, obtained broken rear returning mine for grain size -3mm are returned mine for qualification, and qualification is returned mine transports by conveying equipment
Enter afterwards it is broken after second return mine feed bin.
Step 4：Iron concentrate dispensing is counted under storehouse of returning mine when broken second returns mine feed bin capacity close to when production requirement
Measure conveying equipment shut down, stop conveying returning mine, while start iron ore concentrate feed bin lower part conveying equipment and measuring equipment to difference
Iron ore concentrate part of type carries out batch operation according to the ratio；
Step 5：Iron concentrate is dried, and Iron concentrate batch is transported to dryer and carries out drying operation, if Iron concentrate is matched
The water satisfied pellet forming process demand of conjunction material can also use bypass belt feeder directly transport and carry out scalper except miscellaneous with iron content
Object goes out except operation；
Step 6：Iron concentrate batch behind bulk, iron sundries place to go is sent into high-pressure roller mill by high pressure roller mill Iron concentrate
Wet method fine grinding operation is carried out, to ensure that the one after another of high pressure roller mill, high pressure roller mill top stock column should be always ensured that in 3m or more；
Step 7：When carrying out step 6, observation high pressure roller mill lower part discharge port should be noted, when high pressure roller mill lower part discharges
When Iron concentrate batch after fine grinding occurs in mouth, shows that high pressure roller mill top stock column is only left Iron concentrate batch, pass through tune at this time
The conveying device of whole high pressure roller mill lower part changes the flow direction of material, and the high pressure roller mill crushing operation returned mine terminates, high-pressure roller mill
Terminate closed cycle crushing operation, proceed by open type Iron concentrate fine grinding operation, the Iron concentrate after fine grinding by conveying equipment into
Enter strength mixture operation；
Step 8：Additive formulations are prepared, when the Iron concentrate after fine grinding enters intensive mixer by conveying equipment, are opened
Dynamic dedusting ash cellar, bentonite storehouse and second are returned mine the conveying equipment and measuring equipment of feed bin, and dedusting ash, bentonite and qualification are returned
Mine is added agent batch operation according to Iron concentrate setting proportioning, and is mixed together into intensive mixer with Iron concentrate
Operation；
Step 9：Profit mill, Iron concentrate, dedusting ash, bentonite and qualification by strength mixing are returned mine mixture, referred to as mixed
Material is closed, ball mill is delivered to and carries out profit mill operation；
Step 10：Pelletizing, mixture enters feed bin (abbreviation pelletizing storehouse) the progress pelletizing operation on pelletizer top after profit is ground,
The green-ball obtained from pelletizer carries out pellet production according to grate kiln method, and such method is already belonging to general technology,
It repeats no more.
Specifically, it when needing to carry out returning mine broken using high pressure roller mill, should first confirm that in the feed bin of pelletizing storehouse
After mixture disclosure satisfy that the pelletizing job requirements of certain time, it is then shut off the measuring equipment and conveying equipment of Iron concentrate,
Sequence opens high pressure roller mill crushing operation of returning mine according to step 1 to step 3, should be noted the discharging of observation high pressure roller mill lower part at this time
Mouthful, it returns mine constantly when discharge port appearance in high pressure roller mill lower part is broken, shows that high pressure roller mill top stock column is only left to return mine, this
When change the flow direction of material by adjusting the conveying device of high pressure roller mill lower part, the high pressure roller mill crushing operation of Iron concentrate terminates,
High-pressure roller mill terminates open type Iron concentrate wet method fine grinding operation, proceeds by closed cycle crushing operation of returning mine, while should stop
The additive formulations operation returned mine after dedusting ash, bentonite and high pressure roller mill are broken；
Specifically, when needing to carry out Iron concentrate high pressure roller mill wet method fine grinding operation, sequentially according to step 4 to step 10
It is operated.
The invention has the advantages that：The present invention is mainly to make full use of the existing device of production line, by high pressure roller
Grinding system is designed to that time-division processing different material, closed-loop process and open loop handle the mode being combined, play high pressure roller mill respectively
Advantage of the machine in terms of stiff block is broken with Iron concentrate wet type fine grinding, the smashing principle of reasonable consideration pelletizing grinding machine, composition are high
The joint crushing system of pressure roller mill-profit mill, solves the problems, such as that pellet screening is difficult to recycle, meets the needs utilized again,
Material loss is greatly reduced, has saved transport and processing cost, good material treatment effect and new can be obtained
Increase equipment and technique building, investment cost is low, is convenient for large-scale popularization.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific implementation mode
The present invention is described in further detail now.
A kind of pellet screening reuse method as shown in Figure 1, includes the following steps：
Step 1：Collection is returned mine, and is transported to returning mine in storehouse, wherein returning mine as the bulk cargo of drying grate lower part after the collection that will return mine
The unqualified pellet two parts of granularity screened out with finished product screen, the first feed bin of returning mine is to collect bulk cargo and the feed bin returned mine；
Step 2：Bulk and iron alloy member are screened out, by returning mine by conveying equipment and meter under storehouse of returning mine in storehouse of returning mine
The metering of amount equipment conveys and carries out scalper and removes to go out except operation with iron content sundries；
Step 3：It prepares qualification to return mine, high pressure roller mill feed bin will be transported to by bulk, returning mine for iron content sundries removal,
Break process of returning mine is carried out using high pressure roller mill, broken return mine of high pressure roller mill is delivered to by conveying device on screening plant
It is sieved, broken return mine is divided into two kinds of materials of+3mm (i.e. grain size ＞ 3mm) and -3mm (i.e. grain size ＜ 3mm),
In+3mm it is broken after return mine and returned mine storehouse by conveying device, by the sequence progress closed-type high-pressure roller of step 1 to step 3
Mill cycle crushing operation, obtained broken rear returning mine for grain size -3mm are returned mine for qualification, and qualification is returned mine transports by conveying equipment
Enter afterwards it is broken after second return mine feed bin.
Step 4：Iron concentrate dispensing is counted under storehouse of returning mine when broken second returns mine feed bin capacity close to when production requirement
Measure conveying equipment shut down, stop conveying returning mine, while start iron ore concentrate feed bin lower part conveying equipment and measuring equipment to difference
Iron ore concentrate part of type carries out batch operation according to the ratio；
Step 5：Iron concentrate is dried, and Iron concentrate batch is transported to dryer and carries out drying operation, if Iron concentrate is matched
The water satisfied pellet forming process demand of conjunction material can also use bypass belt feeder directly transport and carry out scalper except miscellaneous with iron content
Object goes out except operation；
Step 6：Iron concentrate batch behind bulk, iron sundries place to go is sent into high-pressure roller mill by high pressure roller mill Iron concentrate
Wet method fine grinding operation is carried out, to ensure that the one after another of high pressure roller mill, high pressure roller mill top stock column should be always ensured that in 3m or more；
Step 7：When carrying out step 6, observation high pressure roller mill lower part discharge port should be noted, when high pressure roller mill lower part discharges
When Iron concentrate batch after fine grinding occurs in mouth, shows that high pressure roller mill top stock column is only left Iron concentrate batch, pass through tune at this time
The conveying device of whole high pressure roller mill lower part changes the flow direction of material, and the high pressure roller mill crushing operation returned mine terminates, high-pressure roller mill
Terminate closed cycle crushing operation, proceed by open type Iron concentrate fine grinding operation, the Iron concentrate after fine grinding by conveying equipment into
Enter strength mixture operation；
Step 8：Additive formulations are prepared, when the Iron concentrate after fine grinding enters intensive mixer by conveying equipment, are opened
Dynamic dedusting ash cellar, bentonite storehouse and second are returned mine the conveying equipment and measuring equipment of feed bin, and dedusting ash, bentonite and qualification are returned
Mine is added agent batch operation according to Iron concentrate setting proportioning, and is mixed together into intensive mixer with Iron concentrate
Operation；
Step 9：Profit mill, Iron concentrate, dedusting ash, bentonite and qualification by strength mixing are returned mine mixture, referred to as mixed
Material is closed, ball mill is delivered to and carries out profit mill operation；
Step 10：Pelletizing, mixture enters feed bin (abbreviation pelletizing storehouse) the progress pelletizing operation on pelletizer top after profit is ground,
The green-ball obtained from pelletizer carries out pellet production according to grate kiln method, and such method is already belonging to general technology,
It repeats no more.
Specifically, it when needing to carry out returning mine broken using high pressure roller mill, should first confirm that in the feed bin of pelletizing storehouse
After mixture disclosure satisfy that the pelletizing job requirements of certain time, it is then shut off the measuring equipment and conveying equipment of Iron concentrate,
Sequence opens high pressure roller mill crushing operation of returning mine according to step 1 to step 3, should be noted the discharging of observation high pressure roller mill lower part at this time
Mouthful, it returns mine constantly when discharge port appearance in high pressure roller mill lower part is broken, shows that high pressure roller mill top stock column is only left to return mine, this
When change the flow direction of material by adjusting the conveying device of high pressure roller mill lower part, the high pressure roller mill crushing operation of Iron concentrate terminates,
High-pressure roller mill terminates open type Iron concentrate wet method fine grinding operation, proceeds by closed cycle crushing operation of returning mine, while should stop
The additive formulations operation returned mine after dedusting ash, bentonite and high pressure roller mill are broken；
Specifically, when needing to carry out Iron concentrate high pressure roller mill wet method fine grinding operation, sequentially according to step 4 to step 10
It is operated.
Specifically, dragging with frequency control may be used in the step 2 and conveying equipment in step 4 and measuring equipment
Formula belted electronic balance can adjust the rotating speed of variable-frequency motor according to adjustment return fines material uninterrupted according to the load of electronic scale.
Specifically, the bulk in the step 2 and step 5, which screens out, can use the roll screen progress miscellaneous material screen of bulk to remove, roller
Sieve gap 20mm.
Specifically, the conveying device use of the high pressure roller mill lower part can use turnover panel funnel or positive and negative can transport
The reversible belt machine conveying turned.
Specifically, step 6 mesohigh roller mill top stock column mainly consists of two parts, first, what the need of lower half were crushed
It returns mine, second is that the first half needs the Iron concentrate batch of fine grinding.
Specifically, rotary kiln rotary drum dryer can be used in the drying in the step 5.
Specifically, described second return mine feed bin be equipped with weighing and sensing or level-sensing device, the capacity returned mine in feed bin to second into
Row measures.
Specifically, the chalybeate goes out goes out to remove using electric magnetic iron remover except operation by iron content sundries.
Specifically, the Iron concentrate is exactly the general fine iron breeze of steel plant, predominantly magnetite powder and ground hematite, swollen
It is exactly the general bentonite of steel plant, also referred to as bentonite to moisten soil, mainly has calcium-base bentonite and sodium bentonite, it refers to chain to return mine
The unqualified pellet that comb machine lower part bulk cargo and finished product screen screen out, dedusting ash be pelletizing production used in craft dust removal device and
Mixture in the dedusting ash that environmental dust removal device is collected mainly has electro-precipitating dust, multi-tube dusting ash, gravitational precipitator ash, whirlwind
The dedusting ash such as dedusting ash, bag-type dust ash it is one or more.
It is produced according to process above process organization, returns mine and (account for Iron concentrate, dedusting ash, bentonite with dosage about 8% and return mine
Quality summation), pellet day constant do not reduce, finished ball mean compressive strength 2800N/, fully meet product quality need
It asks, and return mine outward transport and processing cost is greatly reduced.
Specific illustrative embodiment is had been combined above and describes the present invention, but the implementation of the present invention is without being limited thereto.
In the spirit and scope of the present invention, various modifications can be carried out and modification by those skilled in the art, these modifications and variations will be fallen
Within the protection domain for entering claim restriction.
Technology that the present invention is not described in detail, shape, construction part are known technology.
Claims (10)
1. a kind of pellet screening reuse method, it is characterised in that：Step 1：Collection is returned mine, and is transported after the collection that will return mine to returning
In ore storage bin, wherein unqualified pellet two parts of granularity that the bulk cargo and finished product screen for drying grate lower part of returning mine screen out, first returns
Ore bunker is the feed bin collected bulk cargo and returned mine；
Step 2：Bulk and iron alloy member are screened out, the returning mine in storehouse that will return mine sets by conveying equipment and metering under storehouse of returning mine
Standby metering conveys and carries out scalper and removes to go out except operation with iron content sundries；
Step 3：It prepares qualification to return mine, high pressure roller mill feed bin will be transported to by bulk, returning mine for iron content sundries removal, used
High pressure roller mill carries out break process of returning mine, and high pressure roller mill is broken to return mine to be delivered on screening plant by conveying device and carry out
Screening, is divided into two kinds of materials of grain size ＞ 3mm and grain size ＜ 3mm by broken return mine, wherein grain size ＞ 3mm it is broken after return
Mine is returned mine storehouse by conveying device, and closed-type high-pressure roller mill cycle crushing operation is carried out by the sequence of step 1 to step 3,
Obtain it is broken after returning mine for grain size ＜ 3mm return mine for qualification, qualification return mine enter after conveying equipment transports it is broken after the
Two return mine feed bin；
Step 4：Iron concentrate dispensing is measured defeated under storehouse of returning mine when broken second returns mine feed bin capacity close to when production requirement
Send equipment downtime, stop conveying and return mine, at the same start iron ore concentrate feed bin lower part conveying equipment and measuring equipment to variety classes
Iron ore concentrate part carry out batch operation according to the ratio；
Step 5：Iron concentrate is dried, and Iron concentrate batch is transported to dryer and carries out drying operation, if Iron concentrate batch
Water satisfied pellet forming process demand, then using bypass belt feeder directly transport and carry out scalper remove and iron content sundries go out except make
Industry；
Step 6：Iron concentrate batch behind bulk, iron sundries place to go is sent into high-pressure roller mill and carried out by high pressure roller mill Iron concentrate
Wet method fine grinding operation, to ensure that the one after another of high pressure roller mill, high pressure roller mill top stock column should be always ensured that in 3m or more；
Step 7：When carrying out step 6, observation high pressure roller mill lower part discharge port should be noted, discharge port goes out when high pressure roller mill lower part
After existing fine grinding when Iron concentrate batch, show that high pressure roller mill top stock column is only left Iron concentrate batch, at this time by adjusting height
Pressure roller grinds the flow direction of the conveying device change material of lower part, and the high pressure roller mill crushing operation returned mine terminates, and high-pressure roller mill terminates
Closed cycle crushing operation proceeds by open type Iron concentrate fine grinding operation, and the Iron concentrate after fine grinding is entered strong by conveying equipment
Power mixture operation；
Step 8：Additive formulations are prepared, when the Iron concentrate after fine grinding enters intensive mixer by conveying equipment, startup removes
Dust storehouse, bentonite storehouse and second are returned mine the conveying equipment and measuring equipment of feed bin, by dedusting ash, bentonite and qualification return mine by
It is added agent batch operation according to Iron concentrate setting proportioning, and mixing work is carried out into intensive mixer together with Iron concentrate
Industry；
Step 9：Profit mill, Iron concentrate, dedusting ash, bentonite and qualification by strength mixing are returned mine mixture, are referred to as mixed
Material is delivered to ball mill and carries out profit mill operation；
Step 10：Pelletizing, mixture enters the feed bin on pelletizer top after profit mill, and abbreviation pelletizing storehouse carries out pelletizing operation, from making
The green-ball obtained in ball machine carries out pellet production according to grate kiln method.
2. a kind of pellet screening reuse method according to claim 1, it is characterised in that：When need use high pressure roller mill
When carrying out returning mine broken, it should first confirm that the mixture in the feed bin of pelletizing storehouse disclosure satisfy that the pelletizing operation of certain time needs
After asking, it is then shut off the measuring equipment and conveying equipment of Iron concentrate, sequentially opens high pressure of returning mine according to step 1 to step 3
Roller grinds crushing operation, observation high pressure roller mill lower part discharge port is should be noted at this time, after discharge port is crushed when high pressure roller mill lower part
When returning mine, show high pressure roller mill top stock column only be left return mine, the conveying device by adjusting high pressure roller mill lower part changes at this time
Become the flow direction of material, the high pressure roller mill crushing operation of Iron concentrate terminates, and high-pressure roller mill terminates open type Iron concentrate wet method fine grinding work
Industry proceeds by closed cycle crushing operation of returning mine, while should stop returning mine after dedusting ash, bentonite and high pressure roller mill are broken
Additive formulations operation.
3. a kind of pellet screening reuse method according to claim 1, it is characterised in that：It is high when needing to carry out Iron concentrate
When pressure roller grinds wet method fine grinding operation, sequentially operated according to step 4 to step 10.
4. a kind of pellet screening reuse method according to claim 1, it is characterised in that：The step 2 and step 4
In conveying equipment and measuring equipment the towed belted electronic balance with frequency control may be used, can be according to the discharging of electronic scale
The rotating speed of amount adjustment variable-frequency motor is according to adjustment return fines material uninterrupted.
5. a kind of pellet screening reuse method according to claim 1, it is characterised in that：The step 2 and step 5
In bulk screen out can use roll screen carry out the miscellaneous material screen of bulk remove, roll screen gap 20mm.
6. a kind of pellet screening reuse method according to claim 1, it is characterised in that：The high pressure roller mill lower part
Conveying device, which uses, can use turnover panel funnel or can be conveyed with the reversible belt machine that positive and negative rotation operates.
7. a kind of pellet screening reuse method according to claim 1, it is characterised in that：On step 6 mesohigh roller mill
Portion's stock column mainly consists of two parts, and returns mine first, the need of lower half are broken, second is that the first half needs the Iron concentrate of fine grinding to coordinate
Material.
8. a kind of pellet screening reuse method according to claim 1, it is characterised in that：Drying in the step 5
Rotary kiln rotary drum dryer can be used.
9. a kind of pellet screening reuse method according to claim 1, it is characterised in that：Described second feed bin of returning mine is set
There are weighing and sensing or level-sensing device, the capacity returned mine to second in feed bin measures.
10. a kind of pellet screening reuse method according to claim 1, it is characterised in that：The Iron concentrate is exactly steel
The general fine iron breeze in ironworks, predominantly magnetite powder and ground hematite；
The bentonite is exactly the general bentonite of steel plant, also referred to as bentonite, mainly there is calcium-base bentonite and sodium bentonite,
It refers to unqualified pellet that drying grate lower part bulk cargo and finished product screen screen out to return mine；
The dedusting ash is the mixing in the dedusting ash of the craft dust removal device and the collection of environmental dust removal device used in pelletizing production
Object mainly has electro-precipitating dust, multi-tube dusting ash, gravitational precipitator ash, cyclone dust removal grey, bag-type dust ash one or more.
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| CN109772550B (en) * | 2017-11-15 | 2020-10-27 | 宝山钢铁股份有限公司 | System and method for integrating auxiliary raw material crushing and pellet material screening |
| CN109250418A (en) * | 2018-09-30 | 2019-01-22 | 四川德胜集团钒钛有限公司 | Returning charge recovery system and its method for recycling returning charge in a kind of pelletizing production technique |
| CN111468268B (en) * | 2020-04-15 | 2021-10-01 | 中天钢铁集团有限公司 | Pellet composite ore grinding system and pellet composite ore grinding method |
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| CN113186392B (en) * | 2021-04-02 | 2022-10-04 | 首钢京唐钢铁联合有限责任公司 | Pelletizing method for realizing efficient utilization of metallurgical solid waste |
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