CN214765752U - Solid waste treatment equipment for steel slag - Google Patents
Solid waste treatment equipment for steel slag Download PDFInfo
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- CN214765752U CN214765752U CN202120483999.5U CN202120483999U CN214765752U CN 214765752 U CN214765752 U CN 214765752U CN 202120483999 U CN202120483999 U CN 202120483999U CN 214765752 U CN214765752 U CN 214765752U
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Abstract
The utility model discloses a steel slag solid waste treatment device, which relates to the technical field of steel slag solid waste recycling, and comprises a rolling device and a screening device, wherein a discharge port of the rolling device is connected with a feed port of the screening device, and an oversize magnetic separation device and an undersize magnetic separation device are respectively arranged on and under a sieve corresponding to the screening device; the steel slag screening device comprises an oversize magnetic separation device, an undersize magnetic separation device and a screening device, wherein the oversize magnetic separation device is used for classifying the steel slag left on the screen after screening, and the undersize magnetic separation device is used for classifying the steel slag screened to undersize. The steel slag solid waste treatment equipment provided by the utility model can carry out magnetic separation on steel slag on and under the sieve at the same time, improves the magnetic separation efficiency, realizes high-efficiency separation of the steel slag, and has short process flow and high recovery rate of metallic iron; the steel slag with proper granularity is selected for ball milling, so that the operation load of the ball mill can be effectively reduced, and the energy consumption of the ball mill can be reduced.
Description
Technical Field
The utility model relates to a solid waste recycling technical field of slag, concretely relates to solid waste treatment equipment of slag.
Background
The steel slag is waste slag produced in steel-making industry, and the discharge amount of the steel slag is about 13-20% of the steel yield. In 2014, the production amount of steel slag in China is about 1.15 hundred million tons, the steel slag cannot be comprehensively developed and utilized for a long time, the utilization rate is low, the steel slag is stacked for a long time to form a slag hill, a large amount of land is occupied, and a large amount of dust causes environmental pollution. The steel slag resource is fully utilized, which not only is the internal requirement of improving the environment and realizing sustainable development, but also is the root of developing the recycling economy and building resource-saving enterprises.
The iron content in the steel slag reaches 15-20%, and the iron content in the steel slag discharged by the steel industry every year reaches more than 1500 ten thousand tons. The iron content of the steel slag is high, and if the iron in the steel slag can not be effectively removed, the difficulty of crushing and grinding the steel slag is increased, the quality of a steel slag mineral powder product is influenced, and a large amount of iron resources are wasted. At present, domestic steel slag is generally separated by crushing and magnetic separation, for example, a 240 ten thousand ton/year magnetic separation processing line of saddle steel is used for processing the steel slag generated by a converter. The magnetic separation powder produced by the production line is about 4 ten thousand tons every year, the grade of the magnetic separation powder is 40-50%, the magnetic separation powder cannot be directly used as a raw material for blast furnace production, and only can be used as an addition raw material for sintering pellets and returned to sintering for reuse, but the recovery utilization rate is lower. Therefore, the steel slag magnetic separation product needs to be further processed to improve the utilization rate of the steel slag.
Patent application documents have also been published in China, and the following documents are representative by analysis:
the invention patent with the patent application number of CN201610994169.2 discloses a method for recovering metallic iron from steel slag magnetic separation powder, but the separation method of the process is complex, multiple times of ore grinding are needed, the energy consumption of the whole process is high, and the recovery rate is too low although the grade of the obtained iron concentrate is high.
By comprehensively considering the technology disclosed above, the magnetic separation process adopted by the existing steel slag magnetic separation production line is complex, the recovery rate of iron resources is low, and the waste of the iron resources is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: in view of the existing problems, the utility model provides a solid waste treatment equipment of steel slag, classify the steel slag after screening through magnetic separation device on the sieve and magnetic separation device under the sieve, can high-efficiently separate out concentrate, middlings and tailings, the concentrate of magnetic separation can directly be regarded as the raw materials of blast furnace production, middlings and tailings of magnetic separation carry out further processing, or enter the circulation roll-in return circuit and roll-in screening once more, or enter the ball-milling branch road and carry out the ball-milling process after as cement or miscellany raw and other materials; the equipment has the advantages of short process flow, high screening efficiency, low energy consumption, high metal iron recovery rate and the like, and has wide application prospect.
The utility model adopts the technical scheme as follows:
a steel slag solid waste treatment device comprises a rolling device and a screening device, wherein a discharge port of the rolling device is connected with a feed port of the screening device, and an oversize magnetic separation device and an undersize magnetic separation device are respectively arranged on the screen and under the screen corresponding to the screening device; the steel slag screening device comprises an oversize magnetic separation device, an undersize magnetic separation device and a screening device, wherein the oversize magnetic separation device is used for classifying the steel slag left on the screen after screening, and the undersize magnetic separation device is used for classifying the steel slag screened to undersize.
Due to the adoption of the technical scheme, the rolled steel slag is screened into the two parts of the screen and the screen, the screen magnetic separation device and the screen magnetic separation device can simultaneously carry out magnetic separation on the steel slag on the screen and the screen, the magnetic separation efficiency is improved, the high-efficiency separation of the steel slag is realized, the process flow is short, and the recovery rate of the metal iron is high.
Further, the magnetic separation device on the sieve is provided with a concentrate I discharge port and a tailing I discharge port, and the magnetic separation device under the sieve is provided with a concentrate II discharge port, a middlings discharge port and a tailing II discharge port.
By adopting the technical scheme, the steel slag on the screen is divided into the concentrate I and the tailings I by the magnetic separation device on the screen, the steel slag under the screen is divided into the concentrate II, the middlings and the tailings II by the magnetic separation device under the screen, the separated concentrate I and the concentrate II can be directly used as raw materials for blast furnace production, and the rest steel slag needs to be further processed.
Further, the middling discharge port and the tailing I discharge port are connected and return to the rolling device to form a circulating rolling loop; and the discharge port of the tailings II is connected with a ball mill to form a ball milling branch.
By adopting the technical scheme, the middling and the tailings I which are magnetically separated enter a circulating rolling loop to be rolled and screened again, and the magnetically separated tailings II enter a ball milling branch to be subjected to a ball milling process to obtain fine-grained micropowder serving as a cement or mixed material raw material. Because the energy consumption of the ball mill is higher, the tailings II with smaller grain size than the middlings and the tailings I are sent into the ball milling branch for ball milling, so that the operation load of the ball mill can be effectively reduced, and the energy consumption of the ball mill can be reduced.
Further, the middling discharge port is connected with and returns to the rolling device to form a circulating rolling loop; and the tailing II discharge port and the tailing I discharge port are connected with a ball mill to form a ball milling branch.
By adopting the technical scheme, the magnetically separated middlings enter the circulating rolling loop to be rolled and sieved again, and magnetically separated tailings I and tailings II enter a ball milling branch to be subjected to a ball milling process to obtain fine-grained micropowder serving as a cement or mixed material raw material. Because the energy consumption of the ball mill is high, the tailings I and the tailings II with relatively small particle sizes are sent into a ball milling branch for ball milling, so that the operation load of the ball mill can be effectively reduced, and the energy consumption of the ball mill can be reduced.
Further, the magnetic separation device on the screen is a magnetic pulley, and the magnetic separation device under the screen is a magnetic separator with a rotating gradient magnetic field.
By adopting the technical scheme, the steel slag on the screen has larger granularity, so a magnetic pulley is selected for roughing, the steel slag under the screen has smaller granularity, a magnetic separator is selected for multistage fine selection, and the selected tailings I can be selected to enter a circulating rolling loop to be rolled and screened again or enter a ball milling branch to be used as cement or mixed material raw materials after being subjected to a ball milling process according to needs, so the method has wide application prospect.
Furthermore, the field intensity of the magnetic pulley is 5000GS, and the field intensity of the magnetic separator is 300-3000 GS.
Further, the rolling device is a high-pressure roller mill, and the particle size of the steel slag processed by the high-pressure roller mill is less than 50 mm.
Further, the projection pressure of the high-pressure roller mill during rolling is 3-5 MPa.
Further, the screening device 2 is a vibrating screen, and the particle size of a screen mesh of the vibrating screen is 3-5 mm.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a magnetic separation device and undersize magnetic separation device can sieve the slag of oversize and undersize simultaneously, improve magnetic separation efficiency, realize selecting separately the high efficiency of slag, and process flow is short, and the rate of recovery of metallic iron is high.
2. The utility model discloses the concentrate that the magnetism was elected can directly regard as the raw materials of blast furnace production, can regard as cement or admixture raw and other materials after partial slag carries out the ball-milling process.
3. The utility model discloses the suitable slag of granularity is elected to magnetism carries out the ball-milling process, can effectively reduce the running load of ball mill, reduce the energy consumption of ball mill.
4. The utility model discloses the tailing I of electing can select as required to get into roll-in equipment and roll-in screening once more or get into the ball mill and carry out as cement or mixed material raw and other materials after the ball-milling process, has wide application prospect.
Drawings
Fig. 1 is a flow chart of the operation of the embodiment of the tailings I entering the rolling equipment to be rolled again for screening;
fig. 2 is a flow chart of the operation of the embodiment of the ball milling process of the tailings I entering the ball mill.
The labels in the figure are: 1-rolling device, 2-screening device, 3-magnetic separation device on screen, 4-magnetic separation device under screen, and 5-ball mill.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A steel slag solid waste treatment device is shown in figure 1 and comprises a rolling device 1 and a screening device 2, wherein a discharge hole of the rolling device 1 is connected with a feed inlet of the screening device 2, and an oversize magnetic separation device 3 and an undersize magnetic separation device 4 are respectively arranged on the screen and under the screen corresponding to the screening device 2; the steel slag on the sieve after being sieved is classified by the on-sieve magnetic separation device 3, and the steel slag from the sieve after being sieved to the under-sieve magnetic separation device 4. Specifically speaking, through the preliminary screening of sieving mechanism 2, the slag screening after will rolling is oversize and undersize two parts, can sieve the slag of oversize and undersize simultaneously through oversize magnetic separation device 3 and undersize magnetic separation device 4, improves magnetic separation efficiency, realizes selecting separately the high efficiency of slag, and process flow is short, and the rate of recovery of metallic iron is high.
The oversize magnetic separation device 3 is provided with a concentrate I discharge port and a tailing I discharge port, and the undersize magnetic separation device 4 is provided with a concentrate II discharge port, a middlings discharge port and a tailing II discharge port. Specifically, steel slag on the screen is divided into concentrate I and tailings I through the magnetic separation device 3 on the screen, steel slag under the screen is divided into concentrate II, middlings and tailings II through the magnetic separation device 4 under the screen, the comprehensive grade of the separated concentrate I and concentrate II reaches over 65 percent, the concentrate I and the concentrate II can be directly used as raw materials for blast furnace production, and the rest steel slag needs to be further processed.
The middling discharge port and the tailing I discharge port are connected and return to the rolling device 1 to form a circulating rolling loop; and a discharge port of the tailings II is connected with a ball mill 5 to form a ball milling branch. Specifically, the magnetically separated middlings and tailings I enter a circulating rolling loop to be rolled and sieved again, and the magnetically separated tailings II enter a ball milling branch to be subjected to a ball milling process to obtain fine-grained micropowder serving as a raw material of cement or a mixed material. Because the middlings are in an undissociated state and have the granularity larger than that of the tailings II, the middlings need to be circulated to a compression roller mill for further dissociation and are fully selected, and the content of sample iron entering the ball mill is guaranteed to be as low as possible. Because the energy consumption of the ball mill 5 is high, the tailings II with the particle size smaller than that of the middlings and the tailings I are sent into the ball milling branch for ball milling, so that the operation load of the ball mill 5 can be effectively reduced, and the energy consumption of the ball mill 5 can be reduced.
The magnetic separation device 3 on the screen is a magnetic pulley, and the magnetic separation device 4 under the screen is a magnetic separator with a rotary gradient magnetic field. Specifically, the steel slag on the screen has larger granularity, so the magnetic pulley is selected for roughing, and the steel slag under the screen has smaller granularity, so the magnetic separator is selected for multi-stage fine selection.
The field intensity of the magnetic pulley is 5000GS, and the field intensity of the magnetic separator is 300-3000 GS.
The rolling device 1 is a high-pressure roller mill, and the particle size of the steel slag processed by the high-pressure roller mill is less than 50 mm.
And the projection pressure of the high-pressure roller mill during rolling is 3-5 MPa.
The screening device 2 is a vibrating screen, and the particle size of a screen mesh of the vibrating screen is 3-5 mm.
The steel slag solid waste treatment equipment in the embodiment operates according to the following process:
s1: rolling the steel slag solid waste by a rolling device 1;
s2: screening the rolled steel slag through a screening device 2;
s3, classifying the screened steel slag through the magnetic separation device 3 on the screen and the magnetic separation device 4 under the screen respectively;
s4: magnetically separating concentrate I and tailings I by the oversize magnetic separation device 3, and magnetically separating concentrate II, middlings and tailings II by the undersize magnetic separation device 3;
s5, the middling and the tailings I enter a circulating rolling loop to return to the rolling equipment 1 for continuous circulation;
and S6, enabling the tailings II to enter a ball milling branch circuit to be used as a raw material of cement or a mixed material after a ball milling process.
Example 2
A steel slag solid waste treatment device replaces the connection mode of a tailings I discharge port in example 1, and as shown in figure 2, a middling discharge port is connected with and returns to a rolling device 1 to form a circulating rolling loop; and the discharge port of the tailings II and the discharge port of the tailings I are connected with a ball mill 5 to form a ball milling branch. Specifically, the magnetically separated middlings enter a circulating rolling loop to be rolled and sieved again, and magnetically separated tailings I and tailings II enter a ball milling branch to be subjected to a ball milling process to obtain fine-grained micropowder serving as a raw material of cement or a mixed material. Because the middlings are in an undissociated state and have the granularity larger than that of the tailings II, the middlings need to be circulated to a compression roller mill for further dissociation and are fully selected, and the content of sample iron entering the ball mill is guaranteed to be as low as possible. Because the energy consumption of the ball mill is high, the tailings I and the tailings II with relatively small particle sizes are sent into a ball milling branch for ball milling, so that the operation load of the ball mill can be effectively reduced, and the energy consumption of the ball mill can be reduced.
The steel slag solid waste treatment equipment in the embodiment operates according to the following process:
s1: rolling the steel slag solid waste by a rolling device 1;
s2: screening the rolled steel slag through a screening device 2;
s3, classifying the screened steel slag through the magnetic separation device 3 on the screen and the magnetic separation device 4 under the screen respectively;
s4: magnetically separating concentrate I and tailings I by the oversize magnetic separation device 3, and magnetically separating concentrate II, middlings and tailings II by the undersize magnetic separation device 3;
s5, the middlings enter a circulating rolling loop to return to the rolling equipment 1 for continuous circulation;
and S6, enabling the tailings II and the tailings I to enter a ball milling branch circuit to be used as raw materials of cement or mixed materials after ball milling.
Example 3
The raw ore of the steel slag in the Yanxi lake has the moisture content of 5.78 percent, the moisture content is higher, the grade of total iron is 25.60 percent, the maximum grain diameter of the steel slag is less than 30mm, the steel slag solid waste treatment equipment in the embodiment 1 is adopted for treatment, the projection pressure of a high-pressure roller mill during rolling is 4.22MPa, the grain diameter of a screen of a vibrating screen is 5mm, and the field intensity of a magnetic separator is 2500 GS. The comprehensive grade of the concentrate obtained after magnetic separation is 66.63%, the recovery rate is 53.12%, and the concentrate can be directly used as a raw material for blast furnace production; tailings I and middlingsThe cyclic load was 73.10%; the specific surface area of the tailings II after ball milling is 612cm2After the concentration of the cement is/g, the cement can be used as a raw material of cement.
Example 4
The Liaoning steel slag raw ore has the water content of 2.0 percent, the total iron grade of 27.04 percent and the maximum grain size of the steel slag of less than 30mm, the steel slag solid waste treatment equipment in the embodiment 2 is adopted for treatment, the projection pressure of a high-pressure roller mill during rolling is 4.22MPa, the grain size of a screen mesh of a vibrating screen is 5mm, and the field intensity of a magnetic separator is 2500 GS. The comprehensive grade of the concentrate obtained after magnetic separation is 65.43 percent, the recovery rate is 50.84 percent, and the concentrate can be directly used as a raw material for blast furnace production; the middling cycle load is 36.40%; the specific surface area of the tailings I and II after ball milling is 523cm2After the concentration of the cement is/g, the cement can be used as a raw material of cement.
The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to aid in understanding the methods and their core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (9)
1. The utility model provides a solid waste treatment equipment of slag, includes roll-in device (1) and sieving mechanism (2), its characterized in that: a discharge port of the rolling device (1) is connected with a feed port of the screening device (2), and an oversize magnetic separation device (3) and an undersize magnetic separation device (4) are respectively arranged on the screen and under the screen corresponding to the screening device (2); the steel slag screening device comprises an oversize magnetic separation device (3) and an undersize magnetic separation device (4), wherein the steel slag left on the screen after screening is classified by the oversize magnetic separation device, and the steel slag screened to the undersize after screening is classified by the undersize magnetic separation device (4).
2. The steel slag solid waste treatment apparatus according to claim 1, wherein: the screen magnetic separation device (3) is provided with a concentrate I discharge port and a tailing I discharge port, and the screen magnetic separation device (4) is provided with a concentrate II discharge port, a middlings discharge port and a tailing II discharge port.
3. The steel slag solid waste treatment apparatus according to claim 2, wherein: the middling discharge port and the tailing I discharge port are connected and return to the rolling device (1) to form a circulating rolling loop; and the discharge port of the tailings II is connected with a ball mill (5) to form a ball milling branch.
4. The steel slag solid waste treatment apparatus according to claim 2, wherein: the middling discharge hole is connected with and returns to the rolling device (1) to form a circulating rolling loop; and the discharge port of the tailing II and the discharge port of the tailing I are connected with a ball mill (5) to form a ball milling branch.
5. The steel slag solid waste treatment apparatus according to any one of claims 1 to 4, wherein: the magnetic separation device (3) on the screen is a magnetic pulley, and the magnetic separation device (4) under the screen is a magnetic separator with a rotary gradient magnetic field.
6. The steel slag solid waste treatment apparatus according to claim 5, wherein: the field intensity of the magnetic pulley is 5000GS, and the field intensity of the magnetic separator is 300-3000 GS.
7. The steel slag solid waste treatment apparatus according to any one of claims 1 to 4, wherein: the rolling device (1) is a high-pressure roller mill, and the particle size of the steel slag processed by the high-pressure roller mill is less than 50 mm.
8. The steel slag solid waste treatment apparatus according to claim 7, wherein: and the projection pressure of the high-pressure roller mill during rolling is 3-5 MPa.
9. The steel slag solid waste treatment apparatus according to any one of claims 1 to 4, wherein: the screening device (2) is a vibrating screen, and the particle size of a screen mesh of the vibrating screen is 3-5 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121586A (en) * | 2022-07-04 | 2022-09-30 | 中冶节能环保有限责任公司 | Electric furnace slag treatment method and device |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121586A (en) * | 2022-07-04 | 2022-09-30 | 中冶节能环保有限责任公司 | Electric furnace slag treatment method and device |
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