CN116164549A - Liquid copper smelting furnace slag waste heat recovery device and treatment method thereof - Google Patents
Liquid copper smelting furnace slag waste heat recovery device and treatment method thereof Download PDFInfo
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- CN116164549A CN116164549A CN202310450450.XA CN202310450450A CN116164549A CN 116164549 A CN116164549 A CN 116164549A CN 202310450450 A CN202310450450 A CN 202310450450A CN 116164549 A CN116164549 A CN 116164549A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
Abstract
The invention provides a liquid copper smelting furnace slag waste heat recovery device and a treatment method thereof, wherein the liquid copper smelting furnace slag waste heat recovery device comprises a tunnel kiln type slow cooling unit, a shaft furnace type cooling unit and a waste heat recovery unit; the tunnel kiln type slow cooling unit comprises a tunnel kiln type slow cooling zone, and smelting hot slag generated by a smelting furnace is slowly cooled in the tunnel kiln type slow cooling zone to form solid hot slag; the shaft furnace type cooling unit comprises a vertical cooling tower, the solid hot slag formed by the tunnel kiln type slow cooling zone is cooled by the vertical cooling tower to form cold slag, and high-temperature hot air is generated; and the high-temperature hot air is subjected to waste heat recovery through the waste heat recovery unit. The liquid copper smelting furnace slag waste heat recovery device provided by the invention can solve the problems that the existing liquid copper smelting furnace slag treatment mode is low in economic benefit and easy to cause resource waste.
Description
Technical Field
The invention relates to the technical field of waste recovery, in particular to a liquid copper smelting furnace slag waste heat recovery device and a treatment method thereof.
Background
The copper smelting process produces great amount of high temperature 1150-1250 deg.c copper smelting slag, and has high temperature and great amount of waste heat energy source. The method not only causes serious waste of the waste heat of the high-temperature copper smelting furnace slag, but also causes low-altitude pollution due to the formation of SO2 by a small amount of S.
The cooling process of copper smelting slag belongs to a slow cooling process, the process lasts about 64-72 h, in order to enable the copper smelting slag to carry out waste heat recovery, for example, CN202010571614.0 discloses a device system and a method for absorbing waste heat of the copper smelting slag based on coal gasification reaction steps. But the slow cooling process of the copper smelting furnace slag promotes the aggregation and growth of copper matte particles therein, which is beneficial to the recovery of copper in the subsequent beneficiation process. The technical proposal ensures that the copper smelting furnace slag is cooled rapidly, and has great influence on the beneficiation treatment of the copper smelting furnace slag, so that the problems of reduced copper concentrate quantity, high copper content in slag tailings, low copper recovery rate, high beneficiation difficulty and the like are caused by the copper smelting furnace slag. In addition, CN201610566154.6 discloses a system for recovering waste heat of copper smelting furnace slag and directly reducing and extracting iron, and the patent proposes that molten copper smelting furnace slag is directly discharged to a centrifugal device for granulation and then enters a heat exchanger for recovering waste heat, so that the ore grinding process required by extracting iron from copper smelting furnace slag is avoided; the same problems as the prior patent exist, namely that the copper content of the existing copper smelting furnace slag is between 0.8% and 4%, the copper content of the slag is reduced to below 0.3% through ore dressing, and the treatment flow is more. In addition, CN202122689739.6 discloses a high-temperature steel slag waste heat recovery device, the high-temperature steel slag waste heat recovery system is mainly divided into three waste heat recovery rooms, each waste heat recovery room exists separately, and the waste heat recovery room is sequentially pushed to the next waste heat recovery room according to the production procedure; after three waste heat recovery rooms, pouring the waste heat into a slag disintegrating pool, and enabling the slag pan to move by means of rail driving. The three waste heat recovery rooms are respectively provided with a steam branch pipe for converging the waste heat of one steam recovery. According to the technical scheme, carbon powder is added into the furnace to burn and supply heat, and more materials are used. In addition, CN202110296136.1 discloses a device and a method for recovering waste heat of high-temperature steel slag, which are characterized in that semi-solid high-temperature steel slag at 1300 ℃ is poured on a crushing bed, cooling is carried out by adopting cold air, most of steel slag is crushed to be less than 200mm within 8min, and then the steel slag enters an air-cooled heat exchanger, so that the obtained high-temperature air at 360 ℃ is used for heat exchange recovery, and the working flow is complicated. In addition, CN202110546598.4 provides a system and a method for recovering waste heat of high-temperature slag, the method is that the high-temperature slag is poured into a slag water heat exchange device, then water is sprayed to quench the slag to produce steam recovery waste heat, and the scheme is not suitable for recovering waste heat of slag of a copper smelting furnace, and is unfavorable for subsequent mineral separation.
As known from the description of the prior art, most of domestic copper smelting furnace slag treatment is slow cooling and ore dressing to recover valuable metals such as copper; the slow cooling process is that copper smelting furnace slag is discharged from a smelting furnace and enters a slag ladle, the slag ladle is conveyed to an open-air slow cooling field for slow cooling by a slag ladle car, most of waste heat in the slag ladle cannot be recovered, and low-altitude pollution is easily caused.
Based on the above technical problems, a method for effectively recovering heat of copper smelting furnace slag and effectively reducing air pollution is needed.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a liquid copper smelting furnace slag waste heat recovery device and a treatment method thereof, so as to solve the problems of low economic benefit and easy resource waste caused by the existing solid waste treatment method.
The invention provides a liquid copper smelting furnace slag waste heat recovery device, which comprises a tunnel kiln type slow cooling unit, a shaft furnace type cooling unit and a waste heat recovery unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the tunnel kiln type slow cooling unit comprises a tunnel kiln type slow cooling zone, and smelting hot slag generated by a smelting furnace forms solid hot slag after being slowly cooled in the tunnel kiln type slow cooling zone;
the shaft furnace type cooling unit comprises a vertical cooling tower, the solid hot slag formed by the tunnel kiln type slow cooling zone is cooled by the vertical cooling tower to form cold slag, and high-temperature hot air is generated;
and the high-temperature hot air is subjected to waste heat recovery through the waste heat recovery unit.
In addition, the tunnel kiln type slow cooling unit preferably further comprises a flat trolley, smelting hot slag generated by the smelting furnace enters a slag ladle through a chute, and the slag ladle is conveyed to the tunnel kiln type slow cooling area through the flat trolley to be slowly cooled and conveyed out, wherein the smelting hot slag is slowly cooled to form solid hot slag.
In addition, the preferable scheme is that the tunnel kiln type slow cooling zone is of a film wall structure of the waste heat boiler; and, in addition, the processing unit,
and the tunnel kiln type slow cooling zone recovers heat emitted by the smelting hot slag based on the hot boiler film wall structure.
In addition, the top of the outlet of the tunnel kiln type slow cooling zone is provided with a smoke outlet, the smelting hot slag is slowly cooled in the tunnel kiln type slow cooling zone and generates high-temperature smoke, and the high-temperature smoke is discharged through the smoke outlet and then subjected to waste heat recovery and smoke treatment.
Furthermore, it is preferable that a receiving hopper is provided at an upper portion of the vertical cooling tower, and a crushing assembly and a feeding grid are provided in the receiving hopper; wherein, the liquid crystal display device comprises a liquid crystal display device,
and the solid hot slag formed by the tunnel kiln type slow cooling zone is processed by the crushing assembly and the feeding grid in the receiving hopper to form solid crushed hot slag, and the solid crushed hot slag enters the vertical cooling tower.
In addition, preferably, an air supply assembly is arranged at the lower part of the vertical cooling tower, and the air supply assembly supplies cold air into the vertical cooling tower to cool the solid crushed hot slag and form the high-temperature hot air.
In addition, the waste heat recovery unit preferably comprises a dust settling chamber, a waste heat boiler, a cloth bag dust collector and a flue gas circulating fan; wherein, the liquid crystal display device comprises a liquid crystal display device,
the high-temperature hot air generated by the vertical cooling tower enters the waste heat boiler for waste heat recovery after large-particle dust fall is carried out in the dust settling chamber, and then low-temperature cold air is formed after dust collection through the bag dust collector; the low-temperature cold air is sent into the air supply assembly through the smoke circulating fan.
In addition, preferably, a metallurgical crane is arranged above the vertical cooling tower, and the solid hot slag formed by slow cooling in the tunnel kiln type slow cooling zone is transported into the receiving hopper through the metallurgical crane.
On the other hand, the invention also provides a liquid copper smelting furnace slag waste heat recovery method, which utilizes the liquid copper smelting furnace slag waste heat recovery device to carry out waste heat treatment, and the method comprises the following steps:
slowly cooling smelting hot slag generated by a smelting furnace through the tunnel kiln type slow cooling zone to form solid hot slag;
cooling the solid hot slag formed in the tunnel kiln type slow cooling zone by the vertical cooling tower to form cold slag and generating high-temperature hot air;
and carrying out waste heat recovery on the high-temperature hot air through the waste heat recovery unit.
In addition, preferably, the process of forming solid hot slag after slowly cooling the smelting hot slag generated by the smelting furnace through the tunnel kiln type slow cooling zone comprises the following steps of:
smelting hot slag generated by a smelting furnace enters a slag ladle through a chute;
carrying slag bags containing smelting hot slag to the tunnel kiln type slow cooling area through a flat trolley for slow cooling and carrying out; wherein the smelting hot slag is slowly cooled to form solid hot slag.
In addition, preferably, the process of cooling the solid hot slag formed in the tunnel kiln type slow cooling zone by the vertical cooling tower to form cold slag and generating high-temperature hot air comprises the following steps:
the solid hot slag formed in the tunnel kiln type slow cooling zone is treated through a crushing assembly and a feeding grid in a receiving hopper to form solid crushed hot slag, and the formed solid crushed hot slag is introduced into the vertical cooling tower;
and cold air is fed into the vertical cooling tower through an air supply assembly to cool the solid crushed hot slag, and the high-temperature hot air is formed.
Furthermore, preferably, the process of recovering the waste heat of the hot air by the waste heat recovery unit includes:
large-particle dust settling is carried out on the high-temperature hot air generated by the vertical cooling tower through a dust settling chamber;
waste heat recovery is carried out on the high-temperature hot air after the dust fall of the large particles through a waste heat boiler;
collecting dust from the waste heat recovered high-temperature hot air by using a bag dust collector to form low-temperature cold air;
and the low-temperature cold air is sent into the air supply assembly through the flue gas circulating fan.
Compared with the prior art, the liquid copper smelting furnace slag waste heat recovery device and the treatment method thereof have the following beneficial effects:
according to the liquid copper smelting furnace slag waste heat recovery device and the treatment method thereof, the tunnel kiln type slow cooling zone and the vertical cooling tower are utilized to collect waste heat of liquid slag in a grading manner, so that the liquid copper smelting furnace slag waste heat recovery device is used for power generation or other purposes. In addition, the high-temperature solid hot slag is transferred into a vertical cooling tower, and cold air is introduced into the bottom of the vertical cooling tower, so that the cooling speed of the slag can be increased; simultaneously obtaining high-temperature hot air, and recovering waste heat of the high-temperature hot air through a waste heat recovery unit; compared with the conventional slow cooling process, the method can efficiently recover the waste heat of the liquid smelting slag, avoid slow cooling low-altitude pollution, improve the copper recovery rate and the slag concentrate grade, and reduce the copper content in the tailings.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and readily appreciated by reference to the following description and claims in conjunction with the accompanying drawings and a more complete understanding of the invention. In the drawings:
FIG. 1 is a block diagram of a liquid copper smelting slag waste heat recovery apparatus according to an embodiment of the present invention;
fig. 2 is a process flow diagram of a liquid copper smelting slag waste heat recovery apparatus according to an embodiment of the present invention.
Reference numerals: smelting furnace 1, smelting slag ladle 2, flat trolley 3, tunnel kiln type slow cooling zone 4, smoke outlet 5, metallurgical crane 6, vertical cooling tower 7, feeding grid 8, crushing assembly 9, receiving hopper 10, dust settling chamber 11, waste heat boiler 12, bag dust collector 13, and smoke circulating fan 14.
The same reference numerals will be used throughout the drawings to refer to similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The structure of the liquid copper smelting slag waste heat recovery device provided by the invention is described in detail below, and fig. 1 shows the structure of the liquid copper smelting slag waste heat recovery device according to an embodiment of the invention.
As can be seen from fig. 1, the liquid copper smelting slag waste heat recovery device provided by the invention comprises a tunnel kiln type slow cooling unit for carrying out primary slow cooling on liquid copper smelting slag, a shaft furnace type cooling unit for carrying out secondary cooling on the liquid copper smelting slag, and a waste heat recovery unit for carrying out waste heat recovery on generated high-temperature hot-split or high-temperature flue gas.
The tunnel kiln type slow cooling unit comprises a tunnel kiln type slow cooling zone 4, and smelting hot slag (namely liquid copper smelting slag) generated by the smelting furnace 1 is slowly cooled in the tunnel kiln type slow cooling zone 4 to form solid hot slag; the shaft furnace type cooling unit comprises a vertical cooling tower 7, and solid hot slag formed by the tunnel kiln type slow cooling zone 4 is cooled by the vertical cooling tower 7 to form cold slag and generate high-temperature hot air; and the high-temperature hot air is subjected to waste heat recovery through a waste heat recovery unit.
Specifically, the tunnel kiln type slow cooling unit further comprises a flat trolley 3, an inlet of the tunnel kiln type slow cooling zone 4 is arranged near the lower part of a slag discharging hole of the smelting furnace 1, liquid copper smelting slag (the temperature is generally between 1150 ℃ and 1250 ℃) generated by the smelting furnace 1 is discharged into slag ladles through a chute to be packaged to form a first slag ladle 2, the first slag ladle 2 is carried to the tunnel kiln type slow cooling zone 4 through the flat trolley 3 (namely the slag ladle trolley) to be slowly cooled, the first slag ladle 2 is naturally cooled for a period of time (generally between 36 and 42 hours), the temperature of the first slag ladle 2 is reduced to a first preset temperature (generally between 700 and 900 ℃), and then a second slag ladle (a solid slag ladle containing solid hot slag in the interior) is formed.
In order to improve the working efficiency, a tunnel kiln type slow cooling zone 4 is generally configured with a plurality of flat plate trolleys 3 (generally 20 to 200 are provided), slag ladle positions corresponding to the flat plate trolleys 3 are arranged in the tunnel kiln type slow cooling zone 4, one slag ladle is placed on each flat plate trolley 3, in the operation process, the flat plate trolleys 3 carrying the first slag ladle 2 (the smelting hot slag temperature of which is generally between 1150 ℃ and 1250 ℃) enter from an inlet of the tunnel kiln type slow cooling zone 4, and then the flat plate trolleys 3 carrying the second slag ladle with the temperature of 700 to 900 ℃ are transported from an outlet of the tunnel kiln type slow cooling zone 4.
In addition, in order to collect heat dissipated from the smelting slag ladle 2 by the tunnel kiln type slow cooling zone 4, the tunnel kiln type slow cooling zone 4 is generally arranged as a film wall structure of the waste heat boiler 12; for the heat dissipated by the first slag ladle 2 in the tunnel kiln type slow cooling zone 4, the tunnel kiln type slow cooling zone 4 utilizes a film wall structure of a heat boiler to recycle the heat dissipated by the high-temperature slag in the smelting slag ladle 2 and generate saturated steam for other purposes.
In addition, a smoke outlet 5 is arranged at the top of an outlet of the tunnel kiln type slow cooling zone 4, a small amount of S can escape to react with oxygen in the air to form SO2 in the slow cooling process of the tunnel kiln type slow cooling zone 4, namely high-temperature smoke, and the high-temperature smoke is discharged through the smoke outlet 5 and enters the waste heat boiler 12 to recover waste heat and is discharged after being treated by the smoke.
The invention provides a slag waste heat recovery device of a liquid copper smelting furnace 1, which is provided with a flat trolley 3 and a slag ladle return line, wherein a first slag ladle 2 passes through a second slag ladle of 700-900 ℃ which is transported out after a tunnel kiln type slow cooling unit, solid hot slag is contained in the second slag ladle, the solid hot slag is lifted into a receiving hopper 10 arranged at the upper part of a vertical cooling tower 7 through a metallurgical crane 6 arranged above the vertical cooling tower 7, and a crushing assembly 9 and a feeding grid 8 are arranged in the receiving hopper 10; wherein, the solid hot slag formed after slow cooling in the tunnel kiln type slow cooling zone 4 is subjected to a crushing component 9 and a feeding grid 8 in a hopper 10 to form solid crushed hot slag, the solid crushed hot slag enters a vertical cooling tower 7, and the solid crushed hot slag entering the vertical cooling tower 7 is crushed to be less than 200 mm.
It should be noted that, to increase the working efficiency of the vertical cooling towers 7, a plurality of receiving hoppers 10 (1 to 10) are generally provided at the upper portion of each vertical cooling tower 7, each receiving hopper being provided with a respective crushing assembly 9 and a feed grid.
In addition, in order to realize the cooling of the solid crushed hot slag in the vertical cooling tower 7, an air supply assembly is arranged at the lower part of the vertical cooling tower 7, and cold air is sent into the vertical cooling tower 7 by the air supply assembly to cool the solid crushed hot slag and form high-temperature hot air. In order to improve the cooling effect of the vertical cooling tower 7, a plurality of air supply assemblies (1 to 20 air supply assemblies) are generally disposed at the lower part of the waste heat recovery tower, the air supply assemblies supply 100 to 200 ℃ of cold air into the vertical cooling tower 7, the cold air enters the vertical cooling tower 7 to cool the solid hot slag, and high-temperature hot air of 500 to 800 ℃ is discharged at the upper part of the vertical cooling tower 7.
In addition, in order to achieve recovery of the high-temperature hot air, the waste heat recovery unit may include a dust settling chamber 11, a waste heat boiler 12, a cloth bag dust collector 13, and a flue gas circulation fan 14; wherein, the high-temperature hot air generated by the vertical cooling tower 7 enters the waste heat boiler 12 for waste heat recovery after large-particle dust fall is carried out by the dust settling chamber 11, and then the low-temperature cold air of 100 to 200 ℃ is formed after dust collection by the bag dust collector 13; the low-temperature cold air is sent into the air supply assembly through the flue gas circulating fan 14 and returns to the vertical cooling tower 7 for recycling, wherein solid hot slag in the vertical cooling tower 7 enters from top to bottom, and the low-temperature cold air enters from bottom to top at the bottom of the vertical cooling tower 7.
On the other hand, fig. 2 shows a process flow of a liquid copper smelting slag waste heat recovery device according to an embodiment of the present invention, and as can be seen from fig. 2, in order to explain in detail the working principle of the liquid copper smelting slag waste heat recovery device provided by the present invention, the present invention also provides a liquid copper smelting slag waste heat recovery method, which uses the liquid copper smelting slag waste heat recovery device to perform waste heat treatment, the method includes:
slowly cooling smelting hot slag generated by a smelting furnace 1 through a tunnel kiln type slow cooling zone 4 to form solid hot slag;
the solid hot slag formed in the tunnel kiln type slow cooling zone 4 is cooled by a vertical cooling tower 7 to form cold slag, and high-temperature hot air is generated;
and (5) carrying out waste heat recovery on the high-temperature hot air through a waste heat recovery unit.
Specifically, the process of forming solid hot slag after slowly cooling the smelting hot slag generated by the smelting furnace 1 through the tunnel kiln type slow cooling zone 4 comprises the following steps: the smelting hot slag generated by the smelting furnace 1 enters a first slag ladle 2 through a chute, the first slag ladle 2 is carried to a tunnel kiln type slow cooling zone 4 through a flat trolley 3 for slow cooling and is carried out, the smelting hot slag is slowly cooled to form solid hot slag, and the slag ladle containing the solid hot slag is recorded as a second slag ladle.
Further, the process of cooling the solid hot slag formed in the tunnel kiln type slow cooling zone 4 by the vertical cooling tower 7 to form cold slag and generating high-temperature hot air comprises the following steps: the solid slag ladle formed in the tunnel kiln type slow cooling zone 4 is processed through a crushing assembly 9 and a feeding grid 8 in a receiving hopper 10 to form solid crushed hot slag, and the formed solid crushed hot slag is introduced into a vertical cooling tower 7; cold air is fed into the vertical cooling tower 7 through the air supply assembly to cool the solid crushed hot slag, and high-temperature hot air is formed.
Still further, the process of performing the waste heat recovery on the hot air by the waste heat recovery unit includes: large-particle dust fall is carried out on high-temperature hot air generated by the vertical cooling tower 7 through the dust settling chamber 11; waste heat recovery is carried out on the high-temperature hot air after the dust fall of the large particles through the waste heat boiler 12; collecting dust from the waste heat recovered high-temperature hot air through a bag dust collector 13 to form low-temperature cold air; the low temperature cool air is sent to the air supply assembly by the flue gas recirculation fan 14.
The process of the whole liquid copper smelting furnace slag waste heat recovery method is described in detail below.
1. An inlet of the tunnel kiln type slow cooling zone is arranged near the lower part of a slag discharging port of the smelting furnace, liquid copper smelting slag is discharged into a slag ladle to form a first slag ladle, and the first slag ladle is placed on a flat trolley;
2. simultaneously opening an inlet and an outlet of the tunnel kiln type slow cooling zone, conveying a smelting slag ladle filled with liquid copper smelting slag into the tunnel kiln type slow cooling zone through a flat trolley, and simultaneously conveying a flat trolley filled with a second slag ladle cooled to 700-900 ℃ out of the outlet;
3. the flat trolley entering the tunnel kiln type slow cooling zone slowly goes forward to be slowly cooled, 42 to 48 hours are usually needed from entering to transferring out, the first slag ladle is generally cooled to 700 to 900 ℃ to be transferred out, and compared with the traditional slow cooling process, the time is prolonged by 6 to 12 hours, the aggregation and growth of copper matte droplets are further promoted, and the improvement of the slag concentrate grade and the copper recovery rate in the slag beneficiation process is facilitated.
4. The top of the tunnel kiln type slow cooling zone is provided with a boiler membrane type wall structure, water is introduced into the boiler membrane type wall structure, the water in the boiler membrane type wall structure forms saturated low-pressure steam based on heat emitted in the slow cooling process of the smelting slag ladle, the recovery of the heat of the smelting slag ladle is realized, and the generated saturated low-pressure steam is discharged from a steam discharge port for power generation or other modes of application.
5. The slag temperature in the second slag ladle transferred from the tunnel kiln type slow cooling zone is between 700 and 900 ℃, the slag is transferred to the upper part of a receiving hopper at the upper part of the vertical cooling tower, slag in the ladle is poured into the receiving hopper, crushed to less than 200mm in the receiving hopper by a crushing assembly, and screened by a feeding grid to enter the vertical cooling tower;
6. introducing cold air at 100-200 ℃ into the lower part of the vertical cooling tower, enabling the cold air to move from bottom to top, enabling the upper part of the vertical heat recovery tower to be hot slag (the temperature is 700-900 ℃) which is just entered, enabling the lower part of the vertical heat recovery tower to be cold slag (the temperature is 100-200 ℃), enabling the cold air to be heated to form high-temperature hot air (the temperature is 700-900 ℃) and discharging the high-temperature hot air from the upper part of the vertical heat recovery tower, enabling the high-temperature hot air to enter a waste heat boiler to recover waste heat after large-particle dust fall is carried out on the high-temperature hot air in a dust settling chamber, and enabling the high-temperature hot air to enter a bag dust collector to collect smoke dust to form low-temperature cold air.
7. The formed low-temperature cold air is compressed and recycled by a smoke exhaust fan and is sent into an air supply assembly to be used for cooling hot slag again.
8. The slag discharging port of the vertical cooling tower is arranged at the bottom of the tower, slag piles below 200 ℃ are discharged after cooling, and the slag piles are sent to a slag selecting workshop after natural cooling.
9. Before the liquid slag is completely solidified, a small amount of sulfur volatilizes to react with air to form SO2 in the cooling process, and the conventional slow cooling process is easy to cause low-altitude pollution.
10. The traditional slow cooling process has the advantages that the high-temperature slow cooling time is 36-48 h, the low-temperature spraying slow cooling time is 24-30 h, and the liquid copper smelting furnace slag waste heat recovery device provided by the invention has the advantages that the high-temperature slow cooling time is 48-56 h and the low-temperature cooling time is 6-8 h; compared with the conventional process, the water resource waste caused by spraying is avoided, the total cooling time is reduced, and the operation efficiency is improved.
11. The rear-end process of the slow cooling process is slag mineral separation, copper matte microdroplet aggregation growth is facilitated in the slow cooling process, the grade of slag concentrate and the copper recovery rate are improved by subsequent slag mineral separation, the copper matte microdroplet aggregation growth is carried out before the slag is completely solidified, and the copper matte microdroplet aggregation growth is not carried out after the slag is solidified; the high-temperature slow cooling time of the liquid copper smelting furnace slag waste heat recovery device provided by the invention is 8-12 hours longer than that of the conventional process, copper matte microdroplet aggregation growth is facilitated, slag concentrate grade and copper recovery rate can be improved, and copper content in tailings is reduced from 0.25-0.3% to 0.15-0.2%.
According to the specific embodiment, the liquid copper smelting furnace slag waste heat recovery device and the treatment method thereof provided by the invention have the following advantages:
1) And the waste heat of the copper smelting furnace slag in the slow cooling process is fully utilized, and the waste heat of the liquid copper smelting furnace slag is recycled in sections by utilizing the corresponding waste heat recycling device, so that energy waste is avoided.
2) The boiler membrane wall technology is combined with the tunnel kiln type slow cooling zone, so that the waste heat of the high-temperature liquid copper smelting furnace slag is efficiently recovered, the complete solidification time of the copper smelting furnace slag is prolonged, the grade of slag concentrate and the copper recovery rate are improved, and the slow cooling low-altitude pollution of the copper smelting furnace slag is eliminated;
3) And the air cooling technology is utilized to efficiently recycle the waste heat of the high-temperature solid copper smelting furnace slag, so that the cooling speed of the solid copper smelting furnace slag is increased, and the operation rate is improved.
4. The top of the tunnel kiln type slow cooling zone adopts a boiler membrane wall structure, and the front and back of the tunnel kiln type slow cooling zone are provided with doors, so that the slag ladle is ensured to enter and exit, the internal temperature is kept, the waste heat recovery rate is improved, and the solidification process time of liquid slag is prolonged.
5) The bottom of the vertical cooling tower is provided with a one-way door, so that hot air is prevented from escaping from the feed inlet.
6) The vertical cooling tower is matched with a smoke exhaust fan, and the produced high-temperature hot air is recycled after being collected by a waste heat boiler and a cloth bag.
The liquid copper smelting slag waste heat recovery apparatus and the method of using the same according to the present invention are described above by way of example with reference to fig. 1 and 2. However, it will be appreciated by those skilled in the art that various modifications may be made to the liquid copper smelting slag waste heat recovery apparatus and method of use thereof set forth in the foregoing invention without departing from the spirit of the invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (12)
1. The liquid copper smelting furnace slag waste heat recovery device is characterized by comprising a tunnel kiln type slow cooling unit, a shaft furnace type cooling unit and a waste heat recovery unit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the tunnel kiln type slow cooling unit comprises a tunnel kiln type slow cooling zone, and smelting hot slag generated by a smelting furnace forms solid hot slag after being slowly cooled in the tunnel kiln type slow cooling zone;
the shaft furnace type cooling unit comprises a vertical cooling tower, the solid hot slag formed by the tunnel kiln type slow cooling zone is cooled by the vertical cooling tower to form cold slag, and high-temperature hot air is generated;
and the high-temperature hot air is subjected to waste heat recovery through the waste heat recovery unit.
2. The liquid copper smelting furnace slag waste heat recovery device according to claim 1, wherein,
the tunnel kiln type slow cooling unit further comprises a flat trolley, smelting hot slag generated by the smelting furnace enters a slag ladle through a chute, and the smelting hot slag in the slag ladle is transported to the tunnel kiln type slow cooling area for slow cooling and is transported out through the flat trolley; wherein the smelting hot slag is slowly cooled to form solid hot slag.
3. The liquid copper smelting furnace slag waste heat recovery device according to claim 2, wherein,
the tunnel kiln type slow cooling zone is of a film wall structure of the waste heat boiler; and, in addition, the processing unit,
and the tunnel kiln type slow cooling zone recovers heat emitted by the smelting hot slag based on the hot boiler film wall structure.
4. A liquid copper smelting furnace slag waste heat recovery device according to claim 3, wherein,
the top of the outlet of the tunnel kiln type slow cooling zone is provided with a smoke outlet, smelting hot slag is slowly cooled in the tunnel kiln type slow cooling zone and generates high-temperature smoke, and the high-temperature smoke is discharged through the smoke outlet and then subjected to waste heat recovery and smoke treatment.
5. The liquid copper smelting furnace slag waste heat recovery device according to claim 4, wherein,
a receiving hopper is arranged at the upper part of the vertical cooling tower, and a crushing assembly and a feeding grid are arranged in the receiving hopper; wherein, the liquid crystal display device comprises a liquid crystal display device,
and the solid hot slag formed by the tunnel kiln type slow cooling zone is processed by the crushing assembly and the feeding grid in the receiving hopper to form solid crushed hot slag, and the solid crushed hot slag enters the vertical cooling tower.
6. The liquid copper smelting furnace slag waste heat recovery device according to claim 5, wherein,
an air supply assembly is arranged at the lower part of the vertical cooling tower, and cold air is fed into the vertical cooling tower by the air supply assembly to cool the solid hot slag and form the high-temperature hot air.
7. The liquid copper smelting furnace slag waste heat recovery device according to claim 6, wherein,
the waste heat recovery unit comprises a dust settling chamber, a waste heat boiler, a bag dust collector and a flue gas circulating fan; wherein, the liquid crystal display device comprises a liquid crystal display device,
the high-temperature hot air generated by the vertical cooling tower enters the waste heat boiler for waste heat recovery after large-particle dust fall is carried out in the dust settling chamber, and then low-temperature cold air is formed after dust collection through the bag dust collector; the low-temperature cold air is sent into the air supply assembly through the smoke circulating fan.
8. A liquid copper smelting furnace slag waste heat recovery apparatus according to any one of claims 5 to 7,
and a metallurgical crane is arranged above the vertical cooling tower, and the solid hot slag formed by slow cooling in the tunnel kiln type slow cooling zone is transported into the receiving hopper through the metallurgical crane.
9. A liquid copper smelting furnace slag waste heat recovery method characterized by performing waste heat treatment using the liquid copper smelting furnace slag waste heat recovery apparatus according to any one of claims 1 to 8, the method comprising:
slowly cooling smelting hot slag generated by a smelting furnace through the tunnel kiln type slow cooling zone to form solid hot slag;
cooling the solid hot slag formed in the tunnel kiln type slow cooling zone by the vertical cooling tower to form cold slag and generating high-temperature hot air;
and carrying out waste heat recovery on the high-temperature hot air through the waste heat recovery unit.
10. The method for smelting and treating sulfur-containing multi-metal solid wastes according to claim 9, wherein the process of forming solid hot slag after slowly cooling the smelting hot slag generated by the smelting furnace by the tunnel kiln type slow cooling zone comprises the following steps:
smelting hot slag generated by a smelting furnace enters a slag ladle through a chute;
carrying slag bags containing smelting hot slag to the tunnel kiln type slow cooling area through a flat trolley for slow cooling and carrying out; wherein the smelting hot slag is slowly cooled to form solid hot slag.
11. The sulfur-containing multi-metal solid waste smelting process according to claim 10, wherein the process of cooling the solid hot slag formed in the tunnel kiln type slow cooling zone by the vertical cooling tower to form cold slag and generating high-temperature hot air comprises:
the solid hot slag formed in the tunnel kiln type slow cooling zone is treated through a crushing assembly and a feeding grid in a receiving hopper to form solid crushed hot slag, and the formed solid crushed hot slag is introduced into the vertical cooling tower;
and cold air is fed into the vertical cooling tower through an air supply assembly to cool the solid crushed hot slag, and the high-temperature hot air is formed.
12. The sulfur-containing multi-metal solid waste smelting process according to claim 11, wherein the process of recovering waste heat of the hot blast by the waste heat recovery unit comprises:
large-particle dust settling is carried out on the high-temperature hot air generated by the vertical cooling tower through a dust settling chamber;
waste heat recovery is carried out on the high-temperature hot air after the dust fall of the large particles through a waste heat boiler;
collecting dust from the waste heat recovered high-temperature hot air by using a bag dust collector to form low-temperature cold air;
and the low-temperature cold air is sent into the air supply assembly through the flue gas circulating fan.
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