CN114686624A - Non-stop slag treatment method - Google Patents
Non-stop slag treatment method Download PDFInfo
- Publication number
- CN114686624A CN114686624A CN202210324988.1A CN202210324988A CN114686624A CN 114686624 A CN114686624 A CN 114686624A CN 202210324988 A CN202210324988 A CN 202210324988A CN 114686624 A CN114686624 A CN 114686624A
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- Prior art keywords
- slag
- pit
- dry
- molten
- stop
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- 239000002893 slag Substances 0.000 title claims abstract description 307
- 238000000034 method Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000005192 partition Methods 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003672 processing method Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 3
- 101150054854 POU1F1 gene Proteins 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/07—Receptacle features where the slag is treated open to atmosphere
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/072—Tanks to collect the slag, e.g. water tank
Abstract
The invention discloses a non-stop slag treatment method, and relates to the technical field of blast furnace smelting. The slag treatment method comprises the following steps of S1: opening an iron notch to enable the molten slag to flow into a dry slag pit, wherein a partition piece is arranged in the dry slag pit and divides the dry slag pit into a first slag pit and a second slag pit, and the molten slag flows into the first slag pit; s2: enabling the molten slag to continuously enter the first slag pit, wherein when the liquid level of the molten slag in the first slag pit is higher than the partition piece, the molten slag passes through the partition piece and enters the second slag pit; s3: closing the taphole and opening another taphole, allowing the molten slag to flow into another dry slag pit, and repeating steps S1-S2; s4: and taking out the molten slag in the second slag pit. The method can be used for performing non-stop treatment when the grain slag treatment system has faults, so that the yield loss and the fuel consumption are greatly reduced.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a non-stop slag treatment method.
Background
Blast furnace smelting is a complex physical and chemical reaction process for extracting iron elements in iron ores through a blast furnace, a slag-iron mixture after reaction flows out of an iron notch and is separated, molten iron enters an iron ladle, and molten slag enters slag treatment equipment.
Slag treatment equipment is divided into a granulated slag treatment system and a dry slag treatment system, and the granulated slag treatment system is generally used for treating molten slag. When the water slag treatment system fails, the dry slag treatment system is used as an emergency system to treat the molten slag. However, the slag-iron mixture is separated roughly, so that a small amount of molten iron is contained in the slag, and the slag cannot be directly cooled by pumping water, so that the slag can be slowly cooled after the water granulated slag system is repaired and used. The dry slag treatment period is long, when the water granulated slag system is out of service for too long time and the capacity of the dry slag treatment system is insufficient, the water granulated slag system can only be shut down for damping down, a large amount of manpower and material resources are consumed, huge yield loss and fuel consumption are generated for the production of the blast furnace, and various indexes of the blast furnace are seriously influenced.
In view of the above problems, there is a need to develop a non-stop slag treatment method to solve the problems of production loss and fuel consumption caused by production shutdown when the capacity of the dry slag system is insufficient, and severe influence on various indexes of the blast furnace.
Disclosure of Invention
The invention aims to provide a non-stop slag processing method which can prevent the capacity of a dry slag processing system from being insufficient, so that the non-stop processing is carried out when a water slag processing system breaks down, and the yield loss and the fuel consumption are greatly reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a non-stop slag treatment method comprises the following steps:
s1: opening an iron notch to enable the molten slag to flow into a dry slag pit, wherein a partition piece is arranged in the dry slag pit and divides the dry slag pit into a first slag pit and a second slag pit, and the molten slag flows into the first slag pit;
s2: enabling the molten slag to continuously enter the first slag pit, wherein when the liquid level of the molten slag in the first slag pit is higher than the partition piece, the molten slag passes through the partition piece and enters the second slag pit;
s3: closing the taphole and opening another taphole, allowing the molten slag to flow into another dry slag pit, and repeating steps S1-S2;
s4: and taking out the molten slag in the second slag pit.
Preferably, the partition piece is as high as the side wall of the dry slag pit, an overflow port is formed in the partition piece, and the slag enters the second slag pit through the overflow port.
Preferably, the molten slag enters the first slag pit through a slag runner, and the slag runner and the overflow port are arranged in a staggered mode.
Preferably, the depth of the overflow port is D, and the height of the partition is H, wherein D is 1/3H to 1/5H.
Preferably, the partition piece is located in the middle of the dry slag pit, and the first slag pit and the second slag pit are equal in size.
Preferably, the first slag pit and the second slag pit have the length of A and the width of B, and the mass of the molten slag flowing out of the taphole at one time isM, the density of the slag is rho, the expansion coefficient of the slag is k, and the value of H-D is larger than or equal to
Preferably, the second slag pit is provided with a cooling pipe.
Preferably, after step S3, water is poured into the second slag pit in which the flow of the molten slag is stopped, and the molten slag in the second slag pit is cooled.
Preferably, the slag is cooled and solidified to form dry slag, the dry slag is broken, and then the step S4 is performed.
Preferably, a plurality of partitions are arranged in the dry slag pit, and the molten slag flows in from one side of the dry slag pit.
The invention has the beneficial effects that:
the invention provides a non-stop slag treatment method. According to the method, the dry slag pit is divided into a first slag pit and a second slag pit by arranging the partition piece in the dry slag pit. The molten iron is deposited at the bottom of the first slag pit, namely the molten iron and the molten slag are separated for the second time, so that the content of the molten iron in the molten slag entering the second slag pit is further reduced, and the molten iron can be directly cooled by pumping water. Therefore, the slag in the second slag pit can be directly taken out after the tap hole is switched, the circulation is carried out, the dry slag pit cannot cause insufficient capacity due to overlarge slag amount, the slag can be treated for a long time, and even if the repair of the granulated slag treatment system needs a long time, the production stop and the damping down are not needed.
The method can prevent the capacity of the dry slag processing system from being insufficient, so that the water granulated slag processing system can be processed without stopping when the water granulated slag processing system fails, thereby greatly reducing the yield loss and the fuel consumption.
Drawings
FIG. 1 is a flow diagram of a non-stop slag treatment process provided by the present invention;
FIG. 2 is a schematic structural diagram of a dry slag pit provided in a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dry slag pit according to a second embodiment of the present invention.
In the figure:
1. a dry slag pit; 11. a spacer; 111. an overflow port; 12. a first slag pit; 13. a second slag pit; 14. and (4) slag runner.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
A blast furnace normally comprises at least two tapholes, and when a certain amount of slag has tapped from one taphole, the taphole is switched to another taphole, so that the operator has time to handle this portion of slag. According to production practices, the molten iron cannot be cooled by water, otherwise, the molten iron is easy to explode, the safety of operation sites and personnel is seriously harmed, and the molten slag can be directly cooled by water.
Because the separation of the slag-iron mixture is rough, a small amount of molten iron is contained in the slag, so that the traditional dry slag treatment system can only contain the dry slag, and the dry slag cannot be directly cooled by water. When the repair time of the granulated slag treatment system is too long and the dry slag pit 1 corresponding to the taphole is filled with the molten slag, the process can only be carried out in a stopping and blowing-down mode, so that a large amount of manpower and material resources are consumed, huge yield loss and fuel consumption are generated in the production of the blast furnace, and various indexes of the blast furnace are seriously influenced.
First embodiment
The embodiment provides a non-stop slag treatment method. As shown in fig. 1 and 2, the method includes the steps of:
s1: opening an iron notch to enable molten slag to flow into a dry slag pit 1, wherein a partition piece 11 is arranged in the dry slag pit 1, the dry slag pit 1 is divided into a first slag pit 12 and a second slag pit 13 by the partition piece 11, and the molten slag flows into the first slag pit 12;
s2: enabling the molten slag to continuously enter the first slag pit 12, and enabling the molten slag to cross the partition piece 11 and enter the second slag pit 13 when the liquid level of the molten slag in the first slag pit 12 is higher than that of the partition piece 11;
s3: closing the taphole and opening another taphole, making the molten slag flow into another dry slag pit 1, and repeating the steps S1-S2;
s4: and taking out the slag in the second slag pit 13.
In the method, a partition piece 11 is arranged in a dry slag pit 1, so that the dry slag pit 1 is divided into a first slag pit 12 and a second slag pit 13. The molten slag enters the first slag pit 12 firstly, and because the density of the molten iron is far greater than that of the molten slag, the molten iron can be deposited at the bottom of the first slag pit 12, which is equivalent to secondary separation of the molten iron and the molten slag, so that the content of the molten iron in the molten slag entering the second slag pit 13 is further reduced, water can be directly pumped for cooling, and the molten slag in the second slag pit 13 can be directly taken out after the iron notch is switched. The circulation is carried out in such a way, the dry slag pit 1 cannot cause insufficient capacity due to overlarge slag amount, so that the slag can be treated for a long time, and even if the repair of the granulated slag treatment system needs a long time, the production stop and the damping down are not needed.
The method can utilize the existing dry slag pit 1, only the dry slag pit 1 needs to be modified, and the partition piece 11 is arranged, so that the cost is low and the effect is good.
The method can prevent the capacity of the dry slag processing system from being insufficient, so that the water granulated slag processing system can be processed without stopping when the water granulated slag processing system fails, thereby greatly reducing the yield loss and the fuel consumption.
Preferably, as shown in fig. 2, the height of the partition 11 is equal to that of the side wall of the dry slag pit 1, the partition 11 is provided with an overflow port 111, and the slag enters the second slag pit 13 through the overflow port 111. The height of the side wall of the partition part 11 and the height of the side wall of the dry slag pit 1 are equal, the slag is enabled to enter the second slag pit 13 through the overflow port 111, the initial position of the slag flowing to the second slag pit 13 can be controlled manually, the width of the overflow port 111 can be adjusted according to actual requirements, the flow speed of the slag entering the second slag pit 13 is changed, and the situation that the slag splashes due to the fact that the flow speed is too fast is prevented.
Preferably, as shown in FIG. 2, the molten slag enters the first slag pit 12 through a slag runner 14, the slag runner 14 being offset from the overflow 111. After the slag enters the first slag pit 12, the slag can reach the overflow port 111 only by flowing through the diagonal line of the first slag pit 12, so that the flow path of the slag is increased, the deposition effect of molten iron is improved, the secondary separation effect is further improved, the purity of the slag entering the second slag pit 13 is higher, the content of contained molten iron is lower, and the possibility of explosion during water cooling is further reduced.
Preferably, the depth of the overflow port 111 is D, the height of the partition 11 is H, and D is 1/3H to 1/5H. The depth of the overflow port 111 should not be too large, otherwise, when the amount of the slag stored in the first slag pit 12 and the second slag pit 13 is small, the slag in the two slag pits are communicated, so that the secondary separation function cannot be achieved. The depth of the overflow port 111 is not too small, and the overflow port 111 with too small depth can cause the height of the slag in the first slag pit 12 to flow into the second slag pit 13 when the height of the slag is close to the height of the side wall of the dry slag pit 1, and at the moment, the slag in the first slag pit 12 is easy to splash out of the dry slag pit 1 to cause safety accidents.
Preferably, the partition 11 is positioned in the middle of the dry slag pit 1, and the first slag pit 12 and the second slag pit 13 are equal in size. Because this dry slag hole 1 utilizes current dry slag hole 1 to reform transform and form, its length and width size is all fixed, will separate the piece 11 and set up in the intermediate position, and the parameter of the capacity of the first slag hole 12 of being convenient for operating personnel fast calculation and second slag hole 13, and be difficult for makeing mistakes to can combine the slag quantity that the iron notch flowed out every time to calculate the degree of depth that overflow mouth 111 needs to set up according to the capacity of first slag hole 12 and second slag hole 13.
Specifically, as shown in fig. 2, the first slag pit 12 and the second slag pit 13 both have a length a and a width B, the mass of the primary taphole slag is M, the density of the slag is ρ, and the volume of the primary taphole slag is known
The expansion coefficient of the slag is k, H-D represents the distance from the bottom of the overflow port 111 to the bottom of the second slag pit 13, namely the height of the overflow port 111, and the value of H-D is larger than or equal to
If the value of H-D is equal to
The molten slag in the first slag pit 12 and the second slag pit 13 easily flows into each other.
To solve this problem, a safety reservation factor K needs to be set,
K＞1。
wherein, the mass M of the once-flowing molten slag at the taphole is calculated, and the slag ratio is a. Wherein the slag ratio is the amount of slag produced by smelting one ton of qualified pig iron, the unit is Kg/t, and the amount of molten iron is m. M tons of molten iron are produced, and the mass M of slag is am. Substituting to obtain:
preferably, the second slag pit 13 is provided with cooling pipes. The cooling pipe can spray cold water to the second slag pit 13 to cool the slag in the second slag pit 13.
Preferably, after step S3, water is poured into second slag pit 13 into which the flow of slag is stopped, and the slag in second slag pit 13 is cooled. After the taphole is switched, the slag in the second slag pit 13 is in a non-flowing state, and water is pumped for cooling at the moment, so that splashing caused by the contact of the slag and cooling water during flowing is avoided. Specifically, water is pumped through the cooling pipe.
Preferably, the slag is cooled and solidified to form dry slag, the dry slag is broken up, and then the step S4 is performed. It will be appreciated that the slag, once cooled, solidifies and needs to be broken up before it can be removed. Specifically, after cooling, the dry slag is smashed by a hook machine, loaded and transported to the next process for treatment.
Second embodiment
In the present embodiment, as shown in fig. 3, in the dry slag pit 1, based on the first embodiment, a plurality of partitions 11 are provided in the dry slag pit 1, each partition 11 is provided with an overflow port 111, and slag flows in from one end of the dry slag pit 1, sequentially passes through the overflow ports 111 of the partitions 11, and is cooled by water. Through setting up a plurality of partitions 11, make slag and molten iron accomplish a lot of and separate, further improved the purity of slag when final cooling, explosion when preventing to beat water.
Preferably, the overflow ports 111 of two adjacent partitions 11 are arranged in a staggered manner to prolong the flow path of the slag, improve the effect of multiple separation, increase the purity of the slag during cooling, and further reduce the possibility of explosion during water cooling.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A non-stop slag treatment method is characterized by comprising the following steps:
s1: opening an iron notch to enable the molten slag to flow into a dry slag pit (1), wherein a partition piece (11) is arranged in the dry slag pit (1), the partition piece (11) divides the dry slag pit (1) into a first slag pit (12) and a second slag pit (13), and the molten slag flows into the first slag pit (12);
s2: -continuing the slag into the first slag pit (12), the slag passing over the partition (11) into the second slag pit (13) when the level of the slag in the first slag pit (12) is higher than the partition (11);
s3: closing the taphole and opening another taphole, making the molten slag flow into another dry slag pit (1), and repeating the steps S1-S2;
s4: and taking out the molten slag in the second slag pit (13).
2. The non-stop slag treatment method according to claim 1, wherein the partition (11) and the dry slag pit (1) have the same height, the partition (11) is provided with an overflow port (111), and the slag enters the second slag pit (13) through the overflow port (111).
3. The non-stop slag processing method according to claim 2, wherein the slag enters the first slag pit (12) through a slag runner (14), and the slag runner (14) is arranged offset from the overflow port (111).
4. The non-stop slag processing method according to claim 2, wherein the depth of the overflow port (111) is D, the height of the partition (11) is H, and D is 1/3H-1/5H.
5. The non-stop slag treatment method according to claim 4, characterized in that the partition (11) is located in an intermediate position of the dry slag pit (1), the first slag pit (12) being of equal size to the second slag pit (13).
6. The non-stop slag processing method according to claim 5, wherein the first slag pit (12) and the second slag pit (13) have a length A and a width B, the mass of the slag flowing out of the taphole at one time is M, the density of the slag is p, the expansion coefficient of the slag is k, and the value of H-D is greater than or equal to that of the slag
7. The non-stop slag treatment method according to claim 1, characterized in that the second slag pit (13) is provided with a cooling pipe.
8. The non-stop slag processing method according to claim 1, wherein after step S3, water is poured into the second slag pit (13) in which the flow of the slag is stopped, and the slag in the second slag pit (13) is cooled.
9. The non-stop slag processing method according to claim 8, wherein the slag is cooled and solidified to form dry slag, the dry slag is broken up, and then the step S4 is performed.
10. A method for non-stop slag treatment according to any of the claims 1-9, characterized in that a plurality of partitions (11) are arranged in the dry slag pit (1), the slag flowing in from one side of the dry slag pit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210324988.1A CN114686624A (en) | 2022-03-29 | 2022-03-29 | Non-stop slag treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210324988.1A CN114686624A (en) | 2022-03-29 | 2022-03-29 | Non-stop slag treatment method |
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| CN114686624A true CN114686624A (en) | 2022-07-01 |
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| CN202210324988.1A Pending CN114686624A (en) | 2022-03-29 | 2022-03-29 | Non-stop slag treatment method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203307352U (en) * | 2013-05-21 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Device for recycling roughing slag iron of blast furnace slag |
| WO2017152784A1 (en) * | 2016-03-11 | 2017-09-14 | 西安交通大学 | System and method for dry centrifugal granulation of high_temperature liquid slag and exhaust heat recovery |
| CN107828926A (en) * | 2017-10-31 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of multiple wind slag sluicing system at initial stage method after large blast furnace long term blowing-down |
| CN207918885U (en) * | 2018-03-19 | 2018-09-28 | 宣化钢铁集团有限责任公司 | A kind of Punched box cooling to dry pit high-temperature slag granulation |
| CN113621744A (en) * | 2021-08-10 | 2021-11-09 | 广东韶钢松山股份有限公司 | Method for first iron discharging during blast furnace opening |
-
2022
- 2022-03-29 CN CN202210324988.1A patent/CN114686624A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203307352U (en) * | 2013-05-21 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Device for recycling roughing slag iron of blast furnace slag |
| WO2017152784A1 (en) * | 2016-03-11 | 2017-09-14 | 西安交通大学 | System and method for dry centrifugal granulation of high_temperature liquid slag and exhaust heat recovery |
| CN107828926A (en) * | 2017-10-31 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of multiple wind slag sluicing system at initial stage method after large blast furnace long term blowing-down |
| CN207918885U (en) * | 2018-03-19 | 2018-09-28 | 宣化钢铁集团有限责任公司 | A kind of Punched box cooling to dry pit high-temperature slag granulation |
| CN113621744A (en) * | 2021-08-10 | 2021-11-09 | 广东韶钢松山股份有限公司 | Method for first iron discharging during blast furnace opening |
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