JPH07138621A - Treatment of molten remaining residue in steelmaking process - Google Patents

Abstract

PURPOSE:To obtain a treating method of molten remaining residue in a steelmaking process, in which the treating capacity is large, the development of dust, etc., is little and the separating efficiency of a metal and the slag is high, by blowing high pressure fluid to the flowing down molten remaining residue, pulverizing and separating. CONSTITUTION:The molten remaining residue in the steelmaking process is flowed down directly into a chamber 12 opened to the air from a flow-out hole 32 of a pouring vessel 17 providing control mechanism for flow-out rate and separating mechanism for the molten metal and the molten slag. The high pressure fluid is blown and pulverized to the flowed down molten remaining residue from plural nozzles. This granular remaining residue is separated into the molten metal grain and the slag grain through the separator 20. By this constitution, the treating method of the molten remaining residue, in which the treating capacity is large, the development of dust, etc., is little and the separating efficiency of the metal and the slag is high, is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating molten residue generated in a steelmaking process.

[0002]

2. Description of the Related Art The molten residue generated in the steelmaking process consists of a mixture of molten metal (molten metal) and molten slag.
Generally, the molten residue is treated in a molten and semi-solidified state by receiving the molten residue in a slag pan and discharging it onto a field or an iron plate to naturally cool it. There is a method of performing the method, a method of cooling in a container such as a tundish after casting, and the like. In any method, after solidification / cooling of the molten residue, a crushing step is performed to separate the metal and slag. On the other hand, as a technique for granulating the molten slag, for example, as described in JP-A-59-22642 or JP-A-64-52638, a high-speed gas is blown from a nozzle directed obliquely upward, or A method has been proposed in which molten slag is dropped onto a rotating drum with ribs, atomized (hereinafter, referred to as atomize) and caused to fly, and the flying object is brought into contact with water mist to obtain granular slag.

[0003]

However, since a general method of discharging the molten residue onto a field or an iron plate to solidify and cool it requires a long time for cooling, it is necessary to process a large amount of molten residue. Has a problem in that it requires a large amount of space and equipment. Furthermore, the work of crushing the solidified molten residue requires a large number of personnel in the dusting environment when separating metals, or in the smoke-producing environment when melting large metals, resulting in loss of processed metal, There is a problem that it is necessary to go through complicated steps in order to produce slag particles of various sizes. And, the above-mentioned JP-A-59-22642.
In the method disclosed in Japanese Patent Laid-Open No. 64-52638 or Japanese Patent Laid-Open No. 64-52638, since the cooling capacity is small, there is a problem that the equipment becomes huge to treat a large amount of molten slag, and in order to obtain an appropriate granular slag. However, it is difficult to control the operating conditions and temperature, and if you intend to process the molten residue that is a mixture of molten metal and molten slag, it is difficult to obtain appropriate metal particles and slag particles at the same time due to the difference in physical properties of both. In addition, when treating a molten residue containing molten metal, the metal adheres to the ribbed drum, causing a problem. Therefore, the process of treating the residue in the steelmaking process should be a simple process to improve the environment, to significantly reduce the number of personnel, to further treat the metal and slag at the same time, and to separate them for recycling. Was a problem. The present invention has been made in view of such circumstances, and has a large processing capacity,
An object of the present invention is to provide a method for treating a molten residue in a steelmaking process which produces little dust and the like, has good separation efficiency between slag and metal, and can be used as respective resources.

[0004]

A method according to the above-mentioned object.
The method for treating molten residue in the steelmaking process described is a method of pouring a molten residue consisting of a mixture of molten metal and molten slag generated in the steelmaking process, which has a mechanism for controlling the outflow rate and a mechanism for separating molten metal and molten slag. From the outlet of the container, flow down directly into the chamber opened to the atmosphere,
A high-pressure fluid is sprayed from a plurality of nozzles to the flowing molten residue to granulate it, and then the granular residue is separated into metal particles and slag particles by a sorter. Here, the separation mechanism refers to, for example, a mechanism that distinguishes molten metal from molten slag, such as an eddy current sensor, a magnetic sensor, and a current sensor. With this, the flow rate and pressure of the high-pressure fluid are controlled, and the metal and slag are appropriately cooled to form a granular material. The method for treating a molten residue in a steelmaking process according to claim 2 is the method according to claim 1, wherein the molten residue introduced into the pouring container is configured to be sufficiently heated in advance in a heating container. There is. A method for treating a molten residue in a steelmaking process according to claim 3 is the method according to claim 1 or 2, wherein a predetermined amount of a modifier is mixed in advance with the molten residue discharged from the extraction container. Is configured. A method for treating a molten residue in a steelmaking process according to claim 4 is the method according to claim 1, 2 or 3, wherein the molten residue flowing down is granulated under a low water ratio and high pressure condition. The collision plate is arranged, and secondary cooling water for cooling the residue that has collided with the collision plate under a high water ratio and low pressure condition is supplied. A method for treating a molten residue in a steelmaking process according to claim 5 is the method according to claim 1,
The dispensing container is composed of a heating container.

[0005]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic explanatory view of a treatment facility used in a method for treating a molten residue in a steelmaking process according to a first embodiment of the present invention, FIG. 2 is a sectional view of the atomizing nozzle block, and FIG. 2 is a schematic explanatory view of the treatment equipment used in the method for treating the molten residue in the steelmaking process according to the second embodiment, FIG. 4 is a front sectional view of the atomizing nozzle block, and FIG. 5 is the atomizing nozzle of the atomizing nozzle block. FIG. 6 is an explanatory diagram showing a state where water is sprayed on the residue, and FIG. 6 is a schematic explanatory diagram of a treatment facility used in the method for treating the molten residue in the steelmaking process according to the third embodiment of the present invention.

As shown in FIG. 1, a molten residue treatment equipment 10 used in a method for treating molten residue in a steelmaking process according to a first embodiment of the present invention includes an arc heating furnace 11 which is an example of a heating vessel. A chamber 12 having a modifier hopper 11a for charging a slag modifier in the molten residue and a space for granulating and cooling the injected molten residue.
And a hollow processing body 14 having a recovery hopper 13, an atomizing nozzle block 16 having a plurality of atomizing nozzles (an example of nozzles) 15, a molten residue heated in the arc heating furnace 11, and the outflow of the molten residue. A pouring container 17 having a flow rate control mechanism for flowing the molten residue into the chamber 12, an ejector 18 for ejecting the granulated granular material from the recovery hopper 13, and the ejector 1
The dewatering device 19 for dewatering the granular material conveyed in 8 and the magnetic separator 20 which is an example of a separator for separating the dehydrated granular material into a metal component and a slag component.

The arc heating furnace 11 is mainly made of refractory material and is adapted to pour in the molten residue generated in the steelmaking process to raise the temperature to a predetermined temperature. The modifier hopper 11a is adapted to add a known modifier to the molten residue in order to modify the molten slag in the arc heating furnace 11 as required. The hollow processing body 14 includes a ceiling plate 22 having an injection port 14a in the center, a chamber 12 having a large-diameter cylindrical portion 23 in the upper part and a lower conical collision plate 24 in the lower part, and the collision plate 24 in the upper part. And a recovery hopper 13 having a discharge port 25 at the bottom. Then, the water accumulated in the recovery hopper 13 used for granulating and cooling the molten residue that has flowed down is sent to the cooling water tank 26b by the circulating water pump 26a,
The water in the cooling water tank 26b is sent to the upper part of the chamber 12 by the cooling water pump 26c, flows along the inner wall of the chamber 12, and is used as secondary cooling water.

As shown in FIG. 2, the atomizing nozzle block 16 has a supply port 27 in the center and water supply parts 29 and 29a to which water, which is an example of a high-pressure fluid, is supplied by pumps 28 on both sides. , An annular chamber 31 communicating with the holes 30 and 30a of the water supply units 29 and 29a, and a plurality of atomizing nozzles (12 in the present embodiment are used) surrounding the periphery of the supply port 27 at the lower part. They are provided on the chamber 12 in such a manner that they are inclined obliquely downward and are arranged at equal intervals so as to inject water at one point on the axis.

The pouring container 17 is provided with a residue discharge nozzle 33 as an example of a control mechanism for controlling the flow rate of the heated molten residue at the bottom outlet 32. In this case, when the residue discharge nozzle 33 is a cone type, the diameter is 7 to
Use a 20mm nozzle, 5mm when using a V-shaped nozzle
Although a slit nozzle of ˜12 mm is used, in any case, it is changed depending on the viscosity of the molten residue and the atomizing ability, and it is surely poured from the pouring container 17 at a stable flow rate. Then, the atomizing nozzle block 16 is placed on the ceiling plate 22 of the chamber 12, and the pouring container 17 is provided on the upper portion of the atomizing nozzle block 16 such that the axes of the respective inlets 14a, the supply ports 27, and the outlets 32 are aligned. Are arranged as follows. The discharger 18 is composed of a chain conveyor or a screw conveyor, and discharges the particulate matter from the discharge port 25 at the bottom of the recovery hopper 13,
It is designed to be sent to the carrier 34. The dehydrator 19
Is designed to blow hot air or cold air to the particulate matter adhering to the water, which is sent from the carrier machine 34, to evaporate the moisture and dry it. The magnetic separator 20 is
The particulate matter sent from the dehydrator 19 is separated into metal particles and slag particles and sent to the respective storage hoppers 35 and 36 for separation.

Using this molten residue treatment facility 10,
When treating the molten residue left in the tundish 37 that has been cast by continuous casting, first, the molten residue is poured into the arc heating furnace 11 to raise the temperature to a predetermined temperature, and at the same time, the well-known modification from the modifier hopper 11a. The quality material is added to improve the slag. In this case, the modifying agent lowers the melting point of the slag to improve the activation, and the modifying agent is selected and added within the range of the recycled component of the slag. Since the viscosity of the heated molten residue becomes small, the metal having a high specific gravity is likely to settle down. When the heating and the reforming of the slag are completed, the molten residue whose temperature has been raised is transferred to the pouring container 17 and flows down into the chamber 12 while controlling the outflow rate by the residue discharge nozzle 33, and then the atomizing nozzle 15 injects high pressure. On the collision plate 24 where the secondary cooling water is flowing on the surface, the metal portion is first granulated by the water to become the granular material, then the boundary portion between the metal and the slag, and then the slag and the granular material in sequence. Then, it is cooled while moving downward on the collision plate 24 and accumulated in the recovery hopper 13.

The particulate matter accumulated in the recovery hopper 13 is sent from the discharge port 25 to the dehydrator 19 by the discharge machine 18 and the transport machine 34 to dehydrate the water adhering to the granular matter, and the dehydrated particulate matter. Items are sent to the magnetic separator 20 to separate them into metal particles and slag particles, and the respective storage hoppers 35,
Store in 36. The water accumulated in the recovery hopper 13 is sent to the cooling water tank 26b by the circulating water pump 26a,
The water in the cooling water tank 26b is sent to the upper part of the chamber 12 by the cooling water pump 26c, flows along the inside of the chamber 12, and is used as secondary cooling water. The water pressure for producing metal particles by water atomizing the metal melt is usually 100 to 1000 kg / cm ² , and the water ratio is 3 to 40, which is a high pressure and a high water ratio. The equipment cost is high and the running cost is high. Therefore, in this embodiment, the pressure is 50 to 1000 kg /
cm ² , primary cooling performed in a granulation zone for grinding the melt at a water ratio of 0.3-2.5 and a pressure of 50 kg / cm ^2.
Hereinafter, the function is divided into a secondary cooling performed in a zone having an enhanced cooling function with a water ratio of 3 to 20 to simultaneously and safely granulate a molten residue composed of a mixture of molten metal and molten slag. Further, the outflow timing that changes due to the difference in specific gravity between the molten metal and the molten slag is detected by an eddy current sensor or the like, and the signals are used to adjust the water pressure and water ratio to adjust the particle shape. The particle size distribution of the metal particles and the slag particles by this treatment is shown in Table 1.

[0012]

[Table 1]

Next, a method for treating molten residue in the steelmaking process according to the second embodiment of the present invention will be described.
It should be noted that, in the molten residue treatment equipment used in the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 3, the molten residue treatment equipment 41 used in the molten residue treatment method in the steelmaking process is equipped with an arc heating furnace 42 for raising the temperature of the molten residue and a slag modifier in the molten residue. A reforming material hopper 43, a hollow processing body 46 having a chamber 44 having a space for granulating and cooling the injected molten residue and a recovery hopper 45, and a plurality of atomizing nozzles (an example of nozzles) 47. Atomizing nozzle blocks 48, 48a and the arc heating furnace 4
2, a pouring container 49 that receives the molten residue heated by 2 and has a mechanism for controlling the flow rate of the molten residue and causes the molten residue to flow down into the chamber 44; and the recovery hopper 45 that collects the granulated particles. And a dehydrator 19 for dehydrating the granular material conveyed by the ejector 50,
It has a magnetic separator 20 which is an example of a separator for separating dehydrated granular materials. The hollow processing body 46 includes a cylindrical chamber 44 having a ceiling plate 51 having an inlet in the center, and a recovery hopper 45 having a discharge port 52 at the bottom. Then, the water accumulated in the recovery hopper 45 used for granulating and cooling the molten residue that has flowed down is sent to the cooling water tank 26b by the circulating water pump 26a, and the water in the cooling water tank 26b is chambered by the cooling water pump 26c. It is sent to the upper part of 44 and is made to flow along the inside of the chamber 44 to be used as secondary cooling water.

The atomizing nozzle blocks 48, 48
As shown in FIGS. 4 and 5, a has the same rectangular shape and is provided with water supply portions 54 and 55 to which high-pressure water is supplied by the pump 28 on the back. A chamber 58 communicating with the holes 56, 57 of the parts 54, 55,
A plurality of atomizing nozzles 47 having a wide angle nozzle are arranged at equal intervals in the lower portion of the nozzle 59, and water is jetted by inclining downward at the same angle. Then, the atomizing nozzle blocks 48, 48a are arranged facing each other with a space, and the water in the chambers 58, 59 is linearly jetted to the molten residue flowing down between the atomizing nozzle block 48 and the atomizing nozzle block 48a. Then it is made into granules. Unlike the pouring container 17 of the first embodiment, the pouring container 49 does not have the residue discharge nozzle 33, and the weight of the pouring container 49 is tilted by a signal such as a load cell. Thus, the outflow rate of the molten residue is kept constant and the molten residue is allowed to flow down into the chamber 44. The discharger 50 discharges the particulate matter from the discharge port 52 at the bottom of the recovery hopper 45 and sends it to the conveyor 34.

The second embodiment is a case where the molten residue generated from the refining furnace is treated, and as shown in FIG. 3, the molten residue generated from the refining furnace is received in a slag pan 60 and conveyed. The molten residue is transferred to the arc heating furnace 42, heated to a predetermined temperature, and if necessary, a modifier is introduced from the modifier hopper 43 to modify the molten slag. The molten residue whose temperature has been raised is transferred to the pouring container 49, and the weight of the pouring container 49 is tilted by a signal from a load cell or the like to flow down into the chamber 44. Water is sprayed linearly from the atomizing nozzle 47 equipped with a nozzle into a granular material, which is collected in the recovery hopper 45 while being cooled by the secondary cooling water. The accumulated particulate matter is sent from the discharge port 53 to the conveyor 34 by the ejector 50, is sent to the dehydrator 19 by the conveyor 34 to dehydrate the water adhering to the granular material, and is dehydrated. Send the granular material to the magnetic separator 20 to separate it into metal particles and slag particles,
It is stored in each storage hopper 35, 36. The water accumulated in the recovery hopper 45 is sent to the cooling water tank 26b by the circulating water pump 26a, the water in the cooling water tank 26b is sent to the upper part of the chamber 44 by the cooling water pump 26c, and flows along the inside of the chamber 44. The particle size distributions of the metal particles and the slag particles produced in the second example were almost the same as those in Table 1 in the first example.

Further, the molten residue treatment equipment 62 used in the method for treating molten residue in the steelmaking process according to the third embodiment of the present invention shown in FIG. 6 is the arc heating in the treatment equipment 10 in the first embodiment. The furnace is provided with a pouring function to form a pouring container 63, and after the temperature rise, the residue discharge is an exterior sliding type installed at the bottom of the heating furnace, or the heating furnace is closed to control the pressurization and depressurization in the furnace. By controlling the outflow rate, the molten residue is made to flow down from the residue discharge nozzle 33 into the chamber 12. In this case, the metal and the slag are separated while the temperature of the molten residue is raised. The above 3
In one embodiment, water was sprayed as a high-pressure fluid onto the flowing molten residue, but a gas such as carbon dioxide, air or nitrogen may be used. Further, a magnetic force sorter is used as the sorter, but a specific gravity sorter may be used. Then, the heating container may be omitted by providing a heating device in the pouring container. Furthermore,
As a mechanism for controlling the outflow rate, the present invention is also applied to the case where the pouring container is provided with a lid and hermetically closed, and the discharge flow rate is controlled by changing the internal pressure.

[0017]

In the method for treating molten residue in the steelmaking process according to claims 1 to 5, the molten residue consisting of the mixture of molten metal and molten slag generated in the steelmaking process is caused to flow into the chamber and then to flow down. The molten residue is sprayed with high-pressure fluid from multiple nozzles for granulation, and then the granular residue is selected and separated into metal particles and slag particles, so there is no generation of dust and smoke, and there are few personnel and it is simple. High-speed processing can be continuously performed in various processes. Therefore, the space and personnel can be reduced and the working environment is improved as compared with the case of discharging and treating on a field or an iron plate. Furthermore, since high-speed processing can be performed continuously, the number of spare bases for the slag pan and tundish is reduced, and hot rotary operation of the slag pan and tundish is possible, which significantly reduces refractory costs. it can. In addition, it is now possible to obtain metal particles and slag particles at the same time, which was difficult with conventional relatively simple equipment.Furthermore, there are problems in processing capacity and equipment cost, equipment size, and process problems. Problems such as occurrence of can be solved. The metal particles granulated by this treatment method can be controlled in particle size and can be used in a wide range of fields as high value-added products.

Particularly, in the method for treating a molten residue in the steelmaking process according to the second aspect, since the molten residue charged into the pouring container has been sufficiently heated in advance in the heating container, the viscosity of the molten residue is The metal having a lower specific gravity descends to form a layer on the metal and the slag, and the metal, the boundary portion between the metal and the slag, and the slag are effectively granulated in this order. In the method for treating molten residue in the steelmaking process according to claim 3, since the molten residue discharged from the extraction container is preliminarily mixed with a predetermined amount of the modifier, the range of utilization of the granulated slag particles. Spreads. In the method for treating molten residue in the steelmaking process according to claim 4, a collision plate for receiving the granulated residue is arranged in the chamber, and the secondary cooling water for further cooling the residue collided with the collision plate. Is supplied, the equipment is not heated, and the metal particles and the slag particles are sufficiently cooled, which facilitates the subsequent processing. In the method for treating a molten residue in the steelmaking process according to the fifth aspect, since the pouring container is a heating container, the heating container is not required and the labor for transferring to the heating container can be omitted, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a treatment facility used in a method for treating a molten residue in a steelmaking process according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the atomizing nozzle block.

FIG. 3 is a schematic explanatory diagram of a treatment facility used in a method for treating a molten residue in a steelmaking process according to a second embodiment of the present invention.

FIG. 4 is a front sectional view of the atomizing nozzle block.

FIG. 5 is an explanatory view showing a state in which water is sprayed on the molten residue by the atomizing nozzle of the atomizing nozzle block.

FIG. 6 is a schematic explanatory diagram of a treatment facility used in a method for treating a molten residue in a steelmaking process according to a third embodiment of the present invention.

[Explanation of symbols]

 10 Processing Equipment 11 Arc Heating Furnace 11a Reformer Hopper 12 Chamber 13 Collection Hopper 14 Hollow Processing Body 14a Inlet 15 Atomize Nozzle 16 Atomize Nozzle Block 17 Pouring Vessel 18 Discharger 19 Dehydrator 20 Magnetic Separator 22 Ceiling Plate 23 Cylinder Shaped part 24 Collision plate 25 Discharge port 26a Circulating water pump 26b Cooling water tank 26c Cooling water pump 27 Supply port 28 Pump 29 Water supply part 29a Water supply part 30 hole 30a hole 31 Room 32 Outlet port 33 Residue discharge nozzle 34 Carrier 35 Storage Hopper 36 Storage Hopper 37 Tundish 41 Processing Equipment 42 Arc Heating Furnace 43 Modifying Material Hopper 44 Chamber 45 Recovery Hopper 46 Hollow Processing Body 47 Atomizing Nozzle 48 Atomizing Nozzle Block 48a Atomizing Noz Block 49 dispensing container 50 evacuator 51 ceiling plate 52 outlet 54 water supply unit 55 water supply section 56 hole 57 hole 58 room 59 room 60 受滓 pan 62 treatment facility 63 dispensing container

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoji Shimogasa No. 1 Tobata-cho, Tobata-ku, Kitakyushu, Kitakyushu, Fukuoka Inside the Nippon Steel Corporation Yahata Works (72) Fujiya Nogami Tobata, Kitakyushu, Kitakyushu, Fukuoka No. 1-1, Hibata-cho, Shin-Nippon Steel Co., Ltd., Yawata Works (72) Inventor Kazumi Totoku, No. 1-1, Hibata-cho, Tobata-ku, Kitakyushu, Fukuoka Prefecture (72) Inside Yawata Works, New Japan (72) Inventor Tomohiro Furuta 1-1 Hibahata-cho, Tobata-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor, Shigemitsu Kanegae 1-3-1, Otani, Hachiman-higashi, Kitakyushu, Kitakyushu, Astec Co., Ltd. Irie (72) Inventor Hiroshi Yoshino 1-3-1 Otani, Hachimanto-ku, Kitakyushu, Fukuoka Astec Inc. Irie (72) Inventor Akiharu Kitakyu, Fukuoka 1-3-1 Otani, Hachiman-to-ku, Kumamoto-shi Astec Inc. Irie

Claims (5)

[Claims] 1. A molten residue consisting of a mixture of molten metal and molten slag generated in a steelmaking process is directly exposed to the atmosphere from an outlet of a pouring container equipped with a mechanism for controlling an outflow rate and a mechanism for separating molten metal and molten slag. It is allowed to flow into a chamber opened to the inside, and the molten residue flowing down is sprayed with a high-pressure fluid from a plurality of nozzles to be granulated, and then the granular residue is separated into metal particles and slag particles by a sorter. A method for treating molten residue in a characteristic steelmaking process. 2. The molten residue charged into the pouring container is
The method for treating a molten residue in a steelmaking process according to claim 1, wherein the temperature is sufficiently raised in a heating container in advance. 3. The method for treating a molten residue in a steelmaking process according to claim 1, wherein the molten residue discharged from the extraction container is preliminarily mixed with a predetermined amount of the modifying material. 4. A collision plate is disposed in the chamber for receiving a residue of the molten residue flowing down and granulated under a low water ratio and a high pressure condition, and the residue colliding with the collision plate has a higher water ratio. The method for treating a molten residue in a steelmaking process according to claim 1, 2 or 3, wherein secondary cooling water for cooling under a low pressure condition is supplied. 5. The method for treating a molten residue in a steelmaking process according to claim 1, wherein the pouring container is a heating container.