CN219342237U - Chromium iron slag treatment system - Google Patents

Abstract

The application provides a treatment system of ferrochrome slag, includes: slag discharge launder, slag lifting device, slag drying pool, dust removing device, cooling device and water vapor recovery device; the slag lifting device is arranged in the ferrochrome slag inlet of the dry slag tank and connected with the slag discharging launder, and is used for changing the movement direction of the ferrochrome slag from the slag discharging launder and simultaneously giving the horizontal speed of the ferrochrome slag; the slag drying pool is also respectively connected with a dust removing device and a cooling device, and the cooling device is also connected with a water vapor recovery device. The cooling efficiency of the ferrochrome slag is improved, the particle size of the ferrochrome slag after cooling is reduced, and the production cost is reduced.

Description

Chromium iron slag treatment system

Technical Field

The application relates to the technical field of metal smelting, in particular to a chromium iron slag treatment system.

Background

In recent years, the development of the high-carbon ferrochrome industry in China is rapid, the world-wide largest ferrochrome production country has been reached, the submerged arc furnace is used for smelting high-carbon ferrochrome to produce slag, the ferrochrome slag is chromium-containing smelting waste slag generated in the ferrochrome production process, the ferrochrome slag belongs to general industrial solid waste, and 1.1-1.2t waste slag is produced every 1t ferrochrome, so that the production of the ferrochrome slag in China is estimated to be about 400 ten thousand t each year. The tapping temperature of the ferrochrome slag is 1750-1820 ℃.

The existing chromium iron slag treatment method is two methods, namely a water slag method and a dry slag method, wherein the water slag method is to flush slag into water slag by using high-pressure water in front of a furnace, and then the water slag is separated by slag water, so that the water slag can be recycled, and the finished water slag can be used as cement raw materials, concrete aggregates and the like. Explosion accidents easily occur in the water slag method treatment process, because high-temperature ferrochrome slag generates a large amount of high-temperature and high-pressure steam when meeting water and is decomposed, decomposed hydrogen and oxygen are burnt at high temperature to generate higher temperature, and then the water is vaporized and decomposed violently to generate strong explosion, so that great potential safety hazard is brought to production, and a large amount of water resources are consumed. And after the dry slag method, namely the ferrochrome slag is discharged out of the furnace, the ferrochrome slag is placed in a dry slag pit to be in direct contact with air, and heat exchange is carried out, so that the ferrochrome slag is broken into slag blocks with proper granularity after being cooled, and the slag blocks are used as raw materials of cement and concrete aggregate, slag cotton, glass ceramics and the like, the water consumption in the treatment process of the dry slag method is low, the operation is safe, and the problems in the water slag method are avoided. However, when the dry slag method is used for treating ferrochrome slag, heat exchange is only carried out through air, the cooling efficiency is low, and the molten ferrochrome slag is cooled in a stacked state and is easy to harden, so that the problems of long cooling time and large particle diameter of the ferrochrome slag exist in the dry slag method.

Disclosure of Invention

The present application provides a treatment system for ferrochrome slag, which is used for solving the above-mentioned problems in the background art.

The application provides a treatment system of ferrochrome slag, includes: slag discharge launder, slag lifting device, dry slag pool, dust collector, cooling device and water vapor recovery device.

The slag lifting device is arranged in the ferrochrome slag inlet of the dry slag tank and connected with the slag discharging launder, and is used for changing the movement direction of the ferrochrome slag from the slag discharging launder and giving the horizontal speed of the ferrochrome slag, so that the ferrochrome slag falls to the bottom of the dry slag tank in the air in a spiral track.

The slag drying pool is also respectively connected with a dust removing device and a cooling device, and the cooling device is also connected with a water vapor recovery device.

The dust removing device is used for removing dust in the dry slag pool.

The cooling device is used for cooling the ferrochrome slag in the dry slag pool by adopting a water spraying mode.

The water vapor recovery device is used for condensing water vapor generated in the cooling process of the ferrochrome slag in the dry slag pool into liquid water and recycling the liquid water to the cooling device.

Optionally, the slag lifting device comprises a motor, a speed reducer, a rotating shaft and slag lifting blades, wherein the motor is connected to the upper end of the speed reducer through bolts, the lower end of the speed reducer is connected with the rotating shaft through a coupling, and the slag lifting blades are welded at the lower end of the rotating shaft.

Optionally, the section of the slag-lifting blade is in a sector shape or a quadrilateral shape, and the included angle between the section direction of the slag-lifting blade and the horizontal direction is 45-90 degrees.

Optionally, the dust removing device comprises a cyclone separator and an ash collecting hopper, the cyclone separator is arranged on one side of the dry slag pool, and the ash collecting hopper is arranged right below the cyclone separator.

Optionally, cooling device includes circulating water pond, circulation spray pump, shower head, and the shower head passes through circulating spray pump with circulating water pond and is connected, and the shower head evenly is provided with a plurality ofly along dry sediment pond inside wall a week.

Optionally, the vapor recovery device comprises a filter, a negative pressure fan and a heat exchanger, the filter is arranged at the top of the dry slag pool, an outlet of the filter is fixedly connected with a gas phase inlet of the heat exchanger through the negative pressure fan, and a condensate outlet of the heat exchanger is connected with the circulating water pool.

Optionally, the system of the application is further provided with a controller, and the controller is respectively connected with the slag tapping launder, the slag lifting device, the slag drying pool, the dust removing device, the cooling device and the water vapor recovery device.

Optionally, the slag tapping launder is also provided with a first temperature sensor, the side wall of the dry slag pool is provided with a second temperature sensor, and the controller is respectively connected with the first temperature sensor, the motor, the second temperature sensor, the cyclone separator, the circulating spray pump and the negative pressure fan.

Optionally, the processing system is further provided with a crusher, and the crusher is connected with an outlet of the slag drying pool.

The treatment system for the ferrochrome slag provided by the application realizes the treatment of the ferrochrome slag, and compared with the prior art, the treatment system has the following beneficial effects:

(1) Through setting up the slag lifting device, when high temperature melting ferrochrome slag flows into dry slag pond, give ferrochrome slag horizontal direction's speed, by throwing away and granulating under the effect of centrifugal force and form the granule, this application makes ferrochrome slag form the granule promptly at whereabouts in-process through the slag lifting device, the particle diameter of ferrochrome slag after having reduced the cooling, be convenient for follow-up breakage and reuse, make the ferrochrome slag fall to dry slag pond bottom with spiral form orbit in the sky simultaneously, the fall time of extension ferrochrome slag for ferrochrome slag exchanges heat with the air at whereabouts in-process, and then makes the ferrochrome slag realize preliminary cooling in the sky.

(2) This application is through adopting the heat sink that sprays the water atomizing for the cooling of cooling in-process ferrochrome sediment is more even, and water contacts with ferrochrome sediment in the form of fog droplet, avoids explosion, and the operation is safer, and has practiced thrift the quantity of water, has reduced ferrochrome sediment processing cost, has fine economic benefits, can sink into the dry sediment pond bottom with remaining a small amount of dust in the dry sediment pond along with the water droplet simultaneously. The slag lifting device is used for carrying out primary cooling in the falling process, and the cooling device is used for carrying out secondary cooling, so that the cooling efficiency of molten chromium iron slag is improved, and the cooling time is shortened.

(3) Through vapor recovery unit, the water after will condensing is transported to the circulating water pond and is used for cooling chromium iron slag once more, has realized the cyclic utilization of water resource, has reduced the energy consumption, has reduced the manufacturing cost of enterprise.

(4) The chromium iron slag treatment system is safer, more convenient and more compact in equipment arrangement, saves the field and is suitable for popularization and application in industry.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a system for treating ferrochrome slag according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a slag lifting device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a dust removing device according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a cooling device according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a vapor recovery device according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a system for treating ferrochrome slag according to another embodiment of the present application;

fig. 7 is a schematic diagram of a connection structure of a controller according to an embodiment of the present application.

Reference numerals illustrate:

1: slag tapping launder;

2: a slag lifting device;

21: a motor;

22: a speed reducer;

23: a rotation shaft;

24: slag lifting blades;

25: a first temperature sensor;

3: a dry slag pool;

31: a second temperature sensor;

4: a dust removal device;

41: a cyclone separator;

42: an ash collecting hopper;

5: a cooling device;

51: a circulating water tank;

52: a circulating spray pump;

53: a spray header;

6: a water vapor recovery device;

61: a filter;

62: a negative pressure fan;

63: a heat exchanger;

7: a controller;

8: a crusher.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, are also within the scope of the present application based on the embodiments herein.

Fig. 1 is a schematic structural diagram of a ferrochrome slag treatment system according to an embodiment of the present application, as shown in fig. 1, a ferrochrome slag treatment system includes: slag discharge launder 1, slag lifting device 2, dry slag pool 3, dust collector 4, cooling device 5, water vapor recovery device 6 and controller 7.

The slag lifting device 2 is arranged in the ferrochrome slag inlet of the dry slag tank 3 and is connected with the slag discharging launder 1, and the slag lifting device 2 is used for changing the movement direction of the ferrochrome slag from the slag discharging launder 1 and simultaneously giving the ferrochrome slag a horizontal speed so that the ferrochrome slag falls to the bottom of the dry slag tank 3 in the air in a spiral track.

The slag drying pool 3 is also respectively connected with a dust removing device 4 and a cooling device 5, and the cooling device 5 is also connected with a water vapor recovery device 6.

The dust removing device 4 is used for removing dust in the slag drying pool 3.

The cooling device 5 is used for cooling ferrochrome slag in the dry slag pool 3 by adopting a water spraying mode.

The water vapor recovery device 6 is used for condensing water vapor generated in the cooling process of the ferrochrome slag in the dry slag pool 3 into liquid water and recycling the liquid water to the cooling device 5.

Specifically, high Wen Ge slag in a molten state is generated after chromite is smelted, and the high Wen Getie slag is required to be cooled to form solid chromite slag. The ferrochrome slag is drained from the submerged arc furnace through the slag discharging launder 1 and enters the slag drying pond 3, the bottom and the side surfaces of the slag drying pond 3 are paved with iron bricks, hot slag is borne, the slag lifting device 2 is started when the ferrochrome slag flows into the slag drying pond 3, the slag lifting device 2 is used for changing the moving direction of the ferrochrome slag from the slag discharging launder 1, meanwhile, the horizontal speed of the ferrochrome slag is given, the ferrochrome slag is thrown out and granulated to form particles under the action of centrifugal force, the condition that the molten ferrochrome slag is put into a slag drying pit to be in heat exchange with air in the prior art is avoided, the obtained cooled ferrochrome slag is in a large block shape, the operation load of a follow-up crusher is increased, the ferrochrome slag forms particles in the falling process through the slag lifting device 2, the particle size of the cooled ferrochrome slag is reduced, the follow-up crushing and reutilization are facilitated, meanwhile, the ferrochrome slag falls to the bottom of the slag drying pond 3 in the air in a spiral track, the falling time of the ferrochrome slag is prolonged, and the primary cooling of the ferrochrome slag is realized in the air. Dust can be generated when the ferrochrome slag enters the slag drying pool 3, and meanwhile, the dust removing device 4 is started to remove the dust in the slag drying pool 3, so that the operation safety is improved, and meanwhile, air pollution caused by the fact that the dust escapes into the air is avoided. After the ferrochrome slag enters the dry slag tank 3, the cooling device 5 is started to cool the ferrochrome slag, so that the ferrochrome slag in the dry slag tank 3 is cooled to a preset temperature and is formed into blocky ferrochrome slag, the cooling device 5 is carried out in a water spraying mode, a large amount of water vapor can be generated when the high Wen Ge iron slag contacts water, the water vapor recovery device 6 is started, and after the generated water vapor is cooled to form liquid condensate, the liquid condensate is recovered to the cooling device 5 for cooling the ferrochrome slag again, so that the water consumption is reduced, the energy consumption is reduced, and the production cost of enterprises is reduced.

According to the embodiment, the treatment of the ferrochrome slag is completed through the scheme, the moving direction of the ferrochrome slag from the slag discharge launder 1 is changed through the slag lifting device 2, meanwhile, the horizontal speed of the ferrochrome slag is given, the ferrochrome slag is thrown out and granulated to form particles under the action of centrifugal force, the ferrochrome slag falls to the bottom of the dry slag pool 3 in the air in a spiral track, the falling time of the ferrochrome slag is prolonged, and the primary cooling of the ferrochrome slag is realized in the air. The dust in the dry slag pool 3 is removed through the dust removing device 4, so that the operation safety is improved, and meanwhile, air pollution caused by the fact that the dust escapes into the air is avoided. The cooling device 5 is used for cooling the ferrochrome slag, so that the ferrochrome slag in the dry slag pool 3 is cooled to a preset temperature and is agglomerated into block-shaped ferrochrome slag, the slag raising device 2 is used for carrying out primary cooling in the falling process, and the cooling device 5 is used for carrying out secondary cooling, so that the cooling efficiency of the molten ferrochrome slag is improved, and the cooling time is shortened. Meanwhile, the produced vapor is condensed into liquid water through the vapor recovery device 6 and then is recovered to the cooling device 5 to cool the ferrochrome slag, so that the resource waste is avoided, and the energy consumption is reduced. The method reduces the particle size of the cooled ferrochrome slag, is convenient for subsequent crushing and reutilization, can effectively ensure production safety, reduces the production cost of enterprises, has obvious economic benefit and environmental protection benefit, and is suitable for popularization and application.

Fig. 2 is a schematic structural diagram of a slag lifting device according to an embodiment of the present application, as shown in fig. 2, optionally, the slag lifting device 2 includes a motor 21, a speed reducer 22, a rotating shaft 23, and a slag lifting blade 24, where the motor 21 is connected to an upper end of the speed reducer 22 through a bolt, a lower end of the speed reducer 22 is connected to the rotating shaft 23 through a coupling, and the slag lifting blade 24 is welded to a lower end of the rotating shaft 23.

Specifically, when ferrochrome slag flows into the slag drying pool 3, the slag lifting device 2 is started, the motor 21 is used as a power source of the slag lifting blades 24 to power the slag lifting device 2, the lower end of the speed reducer 22 is connected with the rotating shaft 23 through a coupling, and the speed reducer 22 is a speed reduction transmission device connected between the motor 21 and the rotating shaft 23 and is an important link for ensuring the normal operation of the slag lifting device 2. Starting the motor 21, the motor 21 drives the rotation shaft 23 to rotate through the speed reducer 22, the rotation shaft 23 drives the slag lifting blades 24 to rotate, when high-temperature molten ferrochrome slag flows through the slag lifting blades 24, the slag lifting blades 24 give the ferrochrome slag horizontal direction speed, the ferrochrome slag is thrown out and granulated to form particles under the action of centrifugal force, the ferrochrome slag forms particles in the falling process, the particle size of the cooled ferrochrome slag is reduced, the follow-up crushing and reutilization are facilitated, meanwhile, the ferrochrome slag falls to the bottom of the dry slag pool 3 in a spiral track in the air, the falling time of the ferrochrome slag is prolonged, the ferrochrome slag exchanges heat with air in the falling process, and the primary cooling of the ferrochrome slag is realized in the air. According to the size of the slag drying pool 3 and the viscosity of the molten ferrochrome slag in the actual working condition, the power of the motor 21 is adjusted to adjust the rotating speed of the motor, and the larger the rotating speed is, the smaller the particle size of the ferrochrome slag is.

Alternatively, the cross section of the slag lifting blade 24 is in a sector shape or a quadrilateral shape, and the included angle between the cross section direction of the slag lifting blade 24 and the horizontal direction is 45-90 degrees.

Specifically, the cross section of the slag lifting blade 24 is fan-shaped or quadrilateral, so that the contact area of the slag lifting blade 24 and ferrochrome slag can be increased, the included angle between the cross section direction of the slag lifting blade 24 and the horizontal direction is 45-90 degrees, more ferrochrome slag contacts with the slag lifting blade 24, the initial speed in the horizontal direction is obtained, the falling time of the ferrochrome slag is prolonged, and the heat exchange efficiency of the ferrochrome slag is improved.

Fig. 3 is a schematic structural diagram of a dust removing device according to an embodiment of the present application, as shown in fig. 3, optionally, the dust removing device 4 includes a cyclone 41 and a dust collecting bucket 42, the cyclone 41 is disposed at one side of the dry slag pool 3, and the dust collecting bucket 42 is disposed under the cyclone 41.

Specifically, dust is generated in the process that ferrochrome slag enters the slag drying pool 3, and the dust removing device 4 is used for removing the dust in the slag drying pool 3. The dust collector 4 comprises a cyclone 41 and an ash bucket 42, the cyclone 41 is arranged on one side of the dry slag pool 3, dust in the dry slag pool 3 is separated through the cyclone 41, the obtained clean air is discharged from the top of the cyclone 41, and the separated dust is discharged from the bottom of the cyclone 41 to the ash bucket 42 below. The cyclone 41 may be provided in plurality according to actual conditions. The dust in the dry slag pool 3 is removed by the dust removing device 4, so that the operation safety is improved, and meanwhile, air pollution caused by the escape of the dust into the air is avoided. More preferably, the air outlet at the top of the cyclone 41 is also connected with a heat exchange device, and because the tapping temperature of the molten ferrochrome slag is higher, a large amount of waste heat is generated, and the temperature of the air is increased after heat exchange with the air in the dry slag pool 3, clean air at the air outlet of the cyclone 41 is used as a heat source to exchange heat with materials to be heated in the heat exchange device, so that the waste heat is utilized, and the resource utilization rate is improved. The heat exchange means may be a steam generator.

Fig. 4 is a schematic structural diagram of a cooling device according to an embodiment of the present application, as shown in fig. 4, optionally, the cooling device 5 includes a circulation water tank 51, a circulation spray pump 52, and a spray header 53, where the spray header 53 is connected with the circulation water tank 51 through the circulation spray pump 52, and the spray header 53 is uniformly provided with a plurality of spray headers along a circumference of an inner sidewall of the dry slag tank 3.

Specifically, the cooling device 5 adopts a water spraying mode, water in the circulating water tank 51 is conveyed to the spray header 53 through the circulating spray pump 52, the spray header 53 atomizes the water and sprays the atomized water to the ferrochrome slag in the dry slag tank 3, so that the secondary cooling of the ferrochrome slag is realized, the ferrochrome slag in the dry slag tank 3 is cooled to a preset temperature and is formed into blocky ferrochrome slag, the cooling efficiency of the ferrochrome slag is improved, and the cooling time is shortened. The shower head 53 evenly is provided with a plurality of along dry slag pond 3 inside wall a week for the cooling of chromium iron slag is more even in the cooling process, and water with the contact of chromium iron slag in fogdrop form, avoids the explosion, and the operation is safer, and has practiced thrift the quantity of water, can sink into dry slag pond bottom with the water droplet with remaining a small amount of dust in the dry slag pond 3 simultaneously, reduces the escape of dust, improves operational environment's security.

Fig. 5 is a schematic structural diagram of a vapor recovery device according to an embodiment of the present application, as shown in fig. 5, optionally, the vapor recovery device 6 includes a filter 61, a negative pressure fan 62 and a heat exchanger 63, the filter 61 is disposed at the top of the dry slag pool 3, an outlet of the filter 61 is fixedly connected with a gas phase inlet of the heat exchanger 63 through the negative pressure fan 62, and a condensate outlet of the heat exchanger 63 is connected with the circulating water pool 51.

Specifically, when the cooling device 5 is used for cooling ferrochrome slag, a large amount of water vapor can be generated when the high-temperature ferrochrome slag contacts with water, the water vapor recovery device 6 is started, the generated water vapor is condensed into liquid water, the water vapor recovery device 6 comprises a filter 61, a negative pressure fan 62 and a heat exchanger 63, power is provided by the negative pressure fan 62, the water vapor in the dry slag pool 3 is conveyed to the heat exchanger 63 for condensation, and the condensed water is conveyed to the circulating water pool 51 for cooling the ferrochrome slag again, so that the recycling of water resources is realized, the energy consumption is reduced, and the production cost of enterprises is reduced. Meanwhile, the filter 61 is arranged at the top of the slag drying pool 3, the filter 61 is used for filtering a small amount of dust in the water vapor, so that the blockage of the subsequent heat exchanger 63 and the spray header 53 caused by the small amount of dust in the water vapor is prevented, and the service cycle of the system is prolonged. Wherein, the heat exchanger 63 can be an air heat exchanger, so as to reduce the use of cooling medium; the heat exchange device can also be used as heat exchange equipment needing a heating process, waste heat utilization is realized, and good economic benefit is achieved.

Fig. 6 is a schematic structural diagram of a ferrochrome slag treatment system according to another embodiment of the present application, and as shown in fig. 6, optionally, the system of the present application is further provided with a controller 7, where the controller 7 is connected with the slag tapping chute 1, the slag lifting device 2, the dry slag pool 3, the dust removing device 4, the cooling device 5, and the vapor recovery device 6, respectively.

Specifically, the controller 7 is connected with the slag runner 1, the slag lifting device 2, the dry slag pool 3, the dust removing device 4, the cooling device 5 and the water vapor recovery device 6 respectively, and is used for controlling the start and stop of each device, saving manpower and improving operation safety.

Fig. 7 is a schematic diagram of a connection structure of a controller according to an embodiment of the present application, as shown in fig. 7, optionally, the slag tapping chute 1 is further provided with a first temperature sensor 25, a second temperature sensor 31 is disposed on a sidewall of the dry slag pool 3, and the controller 7 is respectively connected with the first temperature sensor 25, the motor 21, the second temperature sensor 31, the cyclone 41, the circulating spray pump 52 and the negative pressure fan 62.

Specifically, the controller 7 is respectively connected with the slag tapping chute 1, the slag lifting device 2, the dry slag pool 3, the dust removing device 4, the cooling device 5 and the water vapor recovery device 6, and is used for controlling the starting and stopping of each device. The first temperature sensor 25 is used for detecting the temperature of the tapping spout 1, and the second temperature sensor 31 is used for detecting the temperature in the slag drying basin 3. The ferrochrome slag is led into the dry slag pool 3 from the submerged arc furnace through the slag discharging launder 1, when the controller 7 receives that the temperature from the first temperature sensor 25 reaches the first preset temperature, the controller 7 starts the motor 21 and the cyclone 41, the motor 21 drives the rotating shaft 23 to rotate through the speed reducer 22, the rotating shaft 23 drives the slag lifting blades 24 to rotate, and when high-temperature molten ferrochrome slag flows through the slag lifting blades 24, the slag lifting blades 24 give the ferrochrome slag horizontal speed and granulate, so that the ferrochrome slag falls to the bottom of the dry slag pool 3 in the air in a spiral track, and meanwhile the cyclone 41 removes dust in the dry slag pool 3. When the ferrochrome slag completely flows into the slag drying pool 3, the controller 7 receives that the temperature from the first temperature sensor 25 reaches a second preset temperature, the controller 7 turns off the motor 21 and the cyclone 41, meanwhile, the controller 7 turns on the circulating spray pump 52 and the negative pressure fan 62, the cooling device 5 and the water vapor recovery device 6 start to work, the circulating spray pump 52 conveys water in the circulating water pool 51 to the spray head 53, the spray head 53 atomizes the water and sprays the water to the ferrochrome slag in the slag drying pool 3, and cooling of the ferrochrome slag is achieved. Meanwhile, the negative pressure fan 62 conveys water vapor in the dry slag pool 3 to the heat exchanger 63 for condensation, the condensed water is conveyed to the circulating water pool 51 for cooling the ferrochrome slag again, and when the controller 7 receives that the temperature from the second temperature sensor 25 reaches a third preset temperature, the controller 7 turns off the circulating spray pump 52 and the negative pressure fan 62 to stop cooling the ferrochrome slag.

Optionally, the treatment system of the present application is further provided with a crusher 8, the crusher 8 being connected with the outlet of the dry slag bath 3.

Specifically, the cooled ferrochrome slag is formed into blocks, the block-shaped ferrochrome slag is crushed by the crusher 8, the particle size of the ferrochrome slag is further reduced, and the crushed ferrochrome slag is returned to the submerged arc furnace for smelting or for producing building materials such as concrete, so that the utilization of solid waste is realized.

The technical scheme of the present application is illustrated in detail by specific examples below.

The operation flow of the chromium iron slag treatment system in the embodiment during specific work is as follows:

the ferrochrome slag is led into the dry slag pool 3 from the submerged arc furnace through the slag discharging launder 1, when the controller 7 receives that the temperature from the first temperature sensor 25 reaches the first preset temperature, the controller 7 starts the motor 21 and the cyclone 41, the motor 21 drives the rotating shaft 23 to rotate through the speed reducer 22, the rotating shaft 23 drives the slag lifting blades 24 to rotate, and when high-temperature molten ferrochrome slag flows through the slag lifting blades 24, the slag lifting blades 24 give the ferrochrome slag horizontal speed, so that the ferrochrome slag falls to the bottom of the dry slag pool 3 in the air in a spiral track, and meanwhile the cyclone 41 removes dust in the dry slag pool 3. When the ferrochrome slag completely flows into the slag drying pool 3, the controller 7 receives that the temperature from the first temperature sensor 25 reaches a second preset temperature, the controller 7 turns off the motor 21 and the cyclone 41, meanwhile, the controller 7 turns on the circulating spray pump 52 and the negative pressure fan 62, the cooling device 5 and the water vapor recovery device 6 start to work, the circulating spray pump 52 conveys water in the circulating water pool 51 to the spray head 53, the spray head 53 atomizes the water and sprays the water to the ferrochrome slag in the slag drying pool 3, and cooling of the ferrochrome slag is achieved. Meanwhile, the negative pressure fan 62 conveys water vapor in the dry slag pool 3 to the heat exchanger 63 for condensation, the condensed water is conveyed to the circulating water pool 51 for cooling the ferrochrome slag again, and when the controller 7 receives that the temperature from the second temperature sensor 25 reaches a third preset temperature, the controller 7 turns off the circulating spray pump 52 and the negative pressure fan 62 to stop cooling the ferrochrome slag. The massive ferrochrome slag is crushed by a crusher 8, the grain size of the ferrochrome slag is reduced, and the crushed ferrochrome slag is returned to an ore furnace for smelting or for producing building materials such as concrete.

Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (9)

1. A system for treating ferrochrome slag, comprising: a slag discharge launder (1), a slag lifting device (2), a dry slag pool (3), a dust removing device (4), a cooling device (5) and a water vapor recovery device (6);

the slag lifting device (2) is arranged in a ferrochrome slag inlet of the dry slag tank (3) and is connected with the slag discharging launder (1), the slag lifting device (2) is used for changing the movement direction of the ferrochrome slag from the slag discharging launder (1) and simultaneously giving the ferrochrome slag a horizontal speed so that the ferrochrome slag falls to the bottom of the dry slag tank (3) in a spiral track in the air;

the dry slag pool (3) is also respectively connected with the dust removing device (4) and the cooling device (5), and the cooling device (5) is also connected with the water vapor recovery device (6);

the dust removing device (4) is used for removing dust in the dry slag pool (3);

the cooling device (5) is used for cooling ferrochrome slag in the dry slag pool (3) by adopting a water spraying mode;

the water vapor recovery device (6) is used for condensing water vapor generated in the cooling process of the ferrochrome slag in the dry slag pool (3) into liquid water and recycling the liquid water to the cooling device (5).

2. The ferrochrome slag treatment system according to claim 1, wherein the slag lifting device (2) comprises a motor (21), a speed reducer (22), a rotating shaft (23) and slag lifting blades (24), the motor (21) is connected to the upper end of the speed reducer (22) through bolts, the lower end of the speed reducer (22) is connected with the rotating shaft (23) through a coupling, and the slag lifting blades (24) are welded at the lower end of the rotating shaft (23).

3. The ferrochrome slag treatment system according to claim 2, wherein the cross section of the slag lifting blade (24) is in a sector shape or a quadrilateral shape, and the included angle between the cross section direction of the slag lifting blade (24) and the horizontal direction is 45-90 degrees.

4. The ferrochrome slag treatment system according to claim 1, wherein the dust removal device (4) comprises a cyclone (41) and an ash collection hopper (42), the cyclone (41) being arranged on one side of the dry slag bath (3), the ash collection hopper (42) being arranged directly below the cyclone (41).

5. The ferrochrome slag treatment system according to claim 1, wherein the cooling device (5) comprises a circulating water tank (51), a circulating spray pump (52) and a spray header (53), the spray header (53) is connected with the circulating water tank (51) through the circulating spray pump (52), and a plurality of spray headers (53) are uniformly arranged along the periphery of the inner side wall of the dry slag tank (3).

6. The ferrochrome slag treatment system according to claim 5, wherein the water vapor recovery device (6) comprises a filter (61), a negative pressure fan (62) and a heat exchanger (63), the filter (61) is arranged at the top of the dry slag tank (3), an outlet of the filter (61) is fixedly connected with a gas phase inlet of the heat exchanger (63) through the negative pressure fan (62), and a condensate outlet of the heat exchanger (63) is connected with the circulating water tank (51).

7. The ferrochrome slag treatment system according to claim 6, wherein the system is further provided with a controller (7);

the controller (7) is respectively connected with the slag discharging launder (1), the slag lifting device (2), the dry slag pool (3), the dust removing device (4), the cooling device (5) and the water vapor recovery device (6).

8. The ferrochrome slag treatment system according to claim 7, wherein the slag runner (1) is further provided with a first temperature sensor (25), and the side wall of the dry slag tank (3) is provided with a second temperature sensor (31);

the controller (7) is respectively connected with the first temperature sensor (25), the motor (21), the second temperature sensor (31), the cyclone separator (41), the circulating spray pump (52) and the negative pressure fan (62).

9. The system according to any of the claims 1-8, characterized in that the system is further provided with a crusher (8), which crusher (8) is connected with the outlet of the dry slag bath (3).

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