CN112280913A - AOD slag treatment method - Google Patents
AOD slag treatment method Download PDFInfo
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- CN112280913A CN112280913A CN202011100460.3A CN202011100460A CN112280913A CN 112280913 A CN112280913 A CN 112280913A CN 202011100460 A CN202011100460 A CN 202011100460A CN 112280913 A CN112280913 A CN 112280913A
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- 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
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- 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
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- 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
- C21B2400/028—Methods of cooling or quenching molten slag with the permanent addition of cooled slag or other solids
-
- 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
- C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising 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
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
Abstract
The invention relates to the technical field of slag treatment, in particular to a treatment method of AOD slag, which comprises the following steps: inhibiting pulverization; preparing AOD mixed slag; adding the AOD mixed slag into a hot stuffy pit; hot-stuffy pit first-stage water fetching; hot stuffy pit two-stage water fetching; water is taken out from the hot stuffy pit three sections; slag is discharged from the hot stuffy pit; compared with the prior art, the treatment method of the AOD slag provided by the invention has the advantages that in order to inhibit pulverization of the slag, borax is selected as a steel slag stabilizer to inhibit pulverization, and the adding method is that an air injection tank is adopted to synchronously inject the borax into a slag tank when the initial AOD slag and the AOD reducing slag are subjected to slag discharge, so that the initial AOD slag, the AOD reducing slag and the borax are fully mixed, and the utilization rate is improved.
Description
Technical Field
The invention relates to the technical field of slag treatment, in particular to a treatment method of AOD slag.
Background
The AOD furnace can produce 200kg of slag per 1t of stainless steel produced, and the metal content in the slag is about 10%. And contains precious rare metals such as nickel, chromium and the like. Therefore, the recovery of metals in AOD slag and the realization of resource recycling are important problems faced by stainless steel production enterprises.
At present, the AOD slag is treated by adopting a slag basin slow cooling treatment process in China.
The slow cooling link in the process treatment method is mainly carried out by adopting a slag basin air cooling and artificial water spraying mode. However, the process has the following disadvantages:
1. in the slag basin air cooling mode, the capacity of the slag basin is small, so the treatment capacity is small, the turnover period is long, the slag basin occupies a large area, and the workshop is large;
2. the AOD slag is easily pulverized to form dust by slow air cooling, so that dust pollution in a steel slag workshop is caused.
3. The water pumping is not controlled, the water pumping is not uniform, the slag cooling is not controlled, the slag is pulverized seriously, and the pulverization degree is not uniform;
4. no facilities for water drainage, gas exhaust and dust exhaust, and great workshop pollution.
In conclusion, the existing slag basin air cooling process method has the defects of large treatment field, low treatment efficiency, non-uniform pulverization, low metal recovery rate, large dust pollution and the like. Therefore, with the increase of the productivity of domestic stainless steel enterprises and the improvement of domestic environmental protection requirements, the treatment of AOD slag becomes a necessary task for each production enterprise. In order to effectively recycle resources and protect the environment. Further research and exploration are needed to explore advanced process methods for AOD slag treatment.
Disclosure of Invention
The invention aims to provide a treatment method of AOD slag, which aims to solve the problems of large treatment field, low treatment efficiency, non-uniform pulverization, low metal recovery rate, large dust pollution and the like existing in the conventional process method.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
respectively adding borax with the respective mass ratio of 1-5% into the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1: 0.5-2 to obtain AOD mixed slag;
3) adding the AOD mixed slag into a hot stuffy pit;
4) hot-stuffy pit first-stage water fetching;
watering and spraying the AOD mixed slag in the hot disintegrating pit for cooling, disintegrating the slag after watering and spraying for cooling, and disintegrating the slag to obtain a section of AOD mixed slag;
5) hot stuffy pit two-stage water fetching;
continuously watering and spraying the first-stage AOD mixed slag for cooling, stewing the slag after watering and spraying the cooled slag, and stewing the slag to obtain second-stage AOD mixed slag;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, carrying out slag smoldering after the water spraying and cooling are carried out, and obtaining three-section AOD mixed slag after the slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Preferably, in the step of inhibiting pulverization, borax in an amount of 2% by mass of each of the AOD initial-stage slag and the AOD reduction slag is added to obtain AOD initial-stage mixed slag and AOD reduction mixed slag.
Preferably, in the step of preparing the AOD mixed slag, the AOD initial-stage mixed slag and the AOD reduction mixed slag are mixed in a mass ratio of 1:1 to obtain the AOD mixed slag.
Preferably, in the step of adding the AOD mixed slag into the hot stuffy pit, the temperature of the AOD mixed slag is 1100-1300 ℃.
Preferably, in the step of adding the AOD mixed slag into the hot stuffy pit, the temperature of the AOD mixed slag is 1200 ℃.
Preferably, in the step of water fetching in the first stage of the hot stuffy pit, the water fetching and spraying cooling time is 120min, the water fetching amount is 30t/h, and the slag stuffy time is 60 min.
Preferably, in the step of hot stuffy pit two-stage water fetching, the water fetching and spraying cooling time is 120min, the water fetching amount is 20t/h, and the slag stuffy time is 60 min.
Preferably, in the three-stage water fetching step of the hot stuffy pit, the water fetching and spraying cooling time is 60min, the water fetching amount is 15t/h, and the slag stuffy time is 60 min.
Preferably, a plurality of automatic water spraying nozzles are uniformly distributed on the pit cover of the hot stuffy pit, and two rows of automatic water spraying nozzles are uniformly arranged on the pit wall of the hot stuffy pit.
Preferably, the automatic water spraying nozzle is a water mist nozzle.
Compared with the prior art, the AOD slag treatment method provided by the invention has the following advantages:
1. according to the AOD slag treatment method, in order to inhibit pulverization of slag, borax is selected as a steel slag stabilizer to inhibit pulverization, and the adding method is that an air injection tank is adopted to synchronously inject the borax into a slag tank when primary AOD slag and AOD reducing slag are discharged, so that the primary AOD slag, the AOD reducing slag and the borax are fully mixed, and the utilization rate is improved.
2. According to the AOD slag treatment method provided by the invention, AOD slag is generally secondary slag, and can be divided into AOD initial slag and AOD reducing slag. The AOD initial slag and the AOD reducing slag have different components, the pulverization degree in the AOD reducing slag pit is very large, and in order to prevent the unevenness during the processing, before the AOD slag is added into the hot stuffy pit, the AOD initial slag and the AOD reducing slag are mixed and then added into the hot stuffy pit, so that the unevenness in the processing process can be avoided.
3. According to the AOD slag treatment method provided by the invention, in order to ensure the watering uniformity, the automatic watering water mist spray heads are arranged on the pit cover of the hot stuffy pit and are uniformly arranged according to the size of the pit cover; meanwhile, two rows of automatic water-fetching water mist nozzles are uniformly arranged at the lower parts of the peripheral pit walls so as to ensure that the lower slag can be fully fetched, and the fetching system ensures the fetching uniformity of water in the pit.
4. According to the AOD slag treatment method provided by the invention, rapid water pumping and cooling are carried out in the process of hot stuffy pit one-stage water pumping, so that C3S (tricalcium silicate) can be condensed, and the formation of C2S (dicalcium silicate) is prevented. And even if it has been converted to a fraction of C2S, the transition from the beta phase to the gamma phase is avoided, so that swelling and decrepitation are minimized.
5. In the AOD slag treatment method provided by the invention, the size of a conventional hot stuffy pit is larger and is 7 meters multiplied by 5 meters, and the size of the hot stuffy pit is determined to be 5 meters long, 5 meters wide and 3.5 meters deep by reducing the size of the hot stuffy pit. Therefore, the pouring of the slag and the digging of the slag are facilitated, and the uniformity of water fetching can be ensured.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
respectively adding borax with the mass ratio of 1% of each of the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1:0.5 to obtain AOD mixed slag;
3) adding the AOD mixed slag into a hot stuffy pit;
4) hot-stuffy pit first-stage water fetching;
carrying out water spraying and cooling on the AOD mixed slag in the hot stuffy pit, wherein the water spraying and cooling time is 120min, the water spraying amount is 30t/h, and carrying out slag stuffiness after the water spraying and cooling, wherein the slag stuffiness time is 60min, and a section of AOD mixed slag is obtained after slag stuffiness;
5) hot stuffy pit two-stage water fetching;
continuously carrying out water spraying and cooling on the first-stage AOD mixed slag, wherein the water spraying and cooling time is 120min, the water spraying amount is 20t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining second-stage AOD mixed slag after the slag smoldering;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, wherein the water spraying and cooling time is 60min, the water spraying amount is 15t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining three-section AOD mixed slag after slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Example 2
A treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
respectively adding borax with the mass ratio of 2% of each of the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1:1 to obtain AOD mixed slag;
3) adding AOD mixed slag into the hot stuffy pit, wherein the temperature of the AOD mixed slag when the AOD mixed slag is added into the hot stuffy pit is 1200 ℃;
4) hot-stuffy pit first-stage water fetching;
carrying out water spraying and cooling on the AOD mixed slag in the hot stuffy pit, wherein the water spraying and cooling time is 120min, the water spraying amount is 30t/h, and carrying out slag stuffiness after the water spraying and cooling, wherein the slag stuffiness time is 60min, and a section of AOD mixed slag is obtained after slag stuffiness;
5) hot stuffy pit two-stage water fetching;
continuously carrying out water spraying and cooling on the first-stage AOD mixed slag, wherein the water spraying and cooling time is 120min, the water spraying amount is 20t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining second-stage AOD mixed slag after the slag smoldering;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, wherein the water spraying and cooling time is 60min, the water spraying amount is 15t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining three-section AOD mixed slag after slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Example 3
A treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
respectively adding 5% of borax in each mass ratio into the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1:2 to obtain AOD mixed slag;
3) adding AOD mixed slag into a hot stuffy pit, wherein the temperature of the AOD mixed slag when the AOD mixed slag is added into the hot stuffy pit is 1100 ℃;
4) hot-stuffy pit first-stage water fetching;
carrying out water spraying and cooling on the AOD mixed slag in the hot stuffy pit, wherein the water spraying and cooling time is 120min, the water spraying amount is 30t/h, and carrying out slag stuffiness after the water spraying and cooling, wherein the slag stuffiness time is 60min, and a section of AOD mixed slag is obtained after slag stuffiness;
5) hot stuffy pit two-stage water fetching;
continuously carrying out water spraying and cooling on the first-stage AOD mixed slag, wherein the water spraying and cooling time is 120min, the water spraying amount is 20t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining second-stage AOD mixed slag after the slag smoldering;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, wherein the water spraying and cooling time is 60min, the water spraying amount is 15t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining three-section AOD mixed slag after slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Example 4
A treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
respectively adding 3% of borax in each mass ratio into the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1:1.5 to obtain AOD mixed slag;
3) adding AOD mixed slag into the hot stuffy pit, wherein the temperature of the AOD mixed slag when the AOD mixed slag is added into the hot stuffy pit is 1300 ℃;
4) hot-stuffy pit first-stage water fetching;
carrying out water spraying and cooling on the AOD mixed slag in the hot stuffy pit, wherein the water spraying and cooling time is 120min, the water spraying amount is 30t/h, and carrying out slag stuffiness after the water spraying and cooling, wherein the slag stuffiness time is 60min, and a section of AOD mixed slag is obtained after slag stuffiness;
5) hot stuffy pit two-stage water fetching;
continuously carrying out water spraying and cooling on the first-stage AOD mixed slag, wherein the water spraying and cooling time is 120min, the water spraying amount is 20t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining second-stage AOD mixed slag after the slag smoldering;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, wherein the water spraying and cooling time is 60min, the water spraying amount is 15t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining three-section AOD mixed slag after slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Example 5
The embodiment is basically the same as the embodiment 2, except that a plurality of automatic water-fetching spray heads are uniformly distributed on the pit cover of the hot stuffy pit, two rows of automatic water-fetching spray heads are uniformly arranged on the pit wall of the hot stuffy pit, and the automatic water-fetching spray heads are water mist spray heads.
Comparative example 1
This comparative example is substantially the same as example 2 except that borax was not added to both the AOD initial slag and the AOD reduction slag in the step of suppressing pulverization.
Comparative example 2
The comparative example is substantially the same as example 2 except that in the step of adding the AOD mixed slag to the hot stuffy pit, the temperature of the AOD mixed slag when added to the hot stuffy pit is 1600 ℃.
Comparative example 3
A treatment method of AOD slag comprises the following steps:
1) inhibiting pulverization;
adding 2 mass percent of borax and AOD mixed slag into AOD furnace slag;
2) adding AOD mixed slag into the hot stuffy pit, wherein the temperature of the AOD mixed slag when the AOD mixed slag is added into the hot stuffy pit is 1200 ℃;
3) hot-stuffy pit first-stage water fetching;
carrying out water spraying and cooling on the AOD mixed slag in the hot stuffy pit, wherein the water spraying and cooling time is 120min, the water spraying amount is 30t/h, and carrying out slag stuffiness after the water spraying and cooling, wherein the slag stuffiness time is 60min, and a section of AOD mixed slag is obtained after slag stuffiness;
4) hot stuffy pit two-stage water fetching;
continuously carrying out water spraying and cooling on the first-stage AOD mixed slag, wherein the water spraying and cooling time is 120min, the water spraying amount is 20t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining second-stage AOD mixed slag after the slag smoldering;
5) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, wherein the water spraying and cooling time is 60min, the water spraying amount is 15t/h, carrying out slag smoldering after the water spraying and cooling are carried out, the slag smoldering time is 60min, and obtaining three-section AOD mixed slag after slag smoldering;
6) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
Comparative example 4
The comparative example is substantially the same as example 2 except that in the hot stuffy pit stage water beating step, the water beating amount is 35 t/h.
Comparative example 5
The comparative example is substantially the same as example 2 except that in the hot stuffy pit stage water beating step, the water beating amount is 25 t/h.
Comparative example 6
The comparative example is substantially the same as example 2 except that the stuffy slag time is 0min in the hot stuffy pit one-stage watering step.
Comparative example 7
The comparative example is substantially the same as example 2 except that in the hot stuffy pit one-stage watering step, the stuffy slag time is 30 min.
Comparative example 8
The comparative example is substantially the same as example 2 except that the stuffy slag time is 90min in the hot stuffy pit one-stage watering step.
Comparative example 9
The comparison example is basically the same as the example 2, except that in the steps of first-stage water pumping of the hot stuffy pit, second-stage water pumping of the hot stuffy pit and third-stage water pumping of the hot stuffy pit, the slag stuffy time is 0 min.
Comparing the three-segment AOD mixed slag prepared in comparative example 1 with the three-segment AOD mixed slag prepared in example 2, it can be found that the three-segment AOD mixed slag prepared in example 2 has a lower degree of pulverization. In the scheme, in order to inhibit pulverization of the slag, the borax is selected as the steel slag stabilizer to inhibit pulverization, and the adding method is that the borax is synchronously sprayed into the slag pot by adopting the air injection pot when the AOD initial slag and the AOD reducing slag are discharged, so that the AOD initial slag, the AOD reducing slag and the borax are fully mixed, and the utilization rate is improved.
Comparing the three-segment AOD mixed slag prepared in the comparative example 2 with the three-segment AOD mixed slag prepared in the example 2, it can be found that the three-segment AOD mixed slag prepared in the example 2 has a lower pulverization degree. In the scheme, the slag discharging temperature of the AOD initial slag and the AOD reducing slag from the AOD furnace is 1600 ℃, if the AOD initial slag and the AOD reducing slag are directly added into the hot stuffy pit, the AOD initial slag and the AOD reducing slag cannot be rapidly cooled to a proper temperature (675 ℃), so that C2S is formed in the hot stuffy pit in a large amount, C2S exists in the slag in various forms, namely alpha, beta and gamma forms, during the period of 600-700 ℃, various solid phases of alpha-C2S are converted into beta-C2S, and during the period of 400-500 ℃, the beta-C2S is partially or completely converted into gamma-C2S. The difference in crystal structure and density between β -C2S and γ -C2S leads to an increase in internal stress, which tends to cause the slag to pulverize into dust, forming a large amount of powder. Therefore, the AOD initial slag and the AOD reducing slag are cooled to 1200 ℃ and added into the hot stuffy pit to better inhibit the pulverization phenomenon.
Comparing the three-segment AOD mixed slag prepared in the comparative example 3 with the three-segment AOD mixed slag prepared in the example 2, it can be found that the three-segment AOD mixed slag prepared in the example 2 has a lower pulverization degree. In the scheme, AOD furnace slag is generally discharged secondarily and can be divided into AOD initial-stage slag and AOD reducing slag. The AOD initial slag and the AOD reducing slag have different components, particularly the pulverization degree of the AOD reducing slag in a hot stuffy pit is very large, and if the AOD slag is directly introduced into the hot stuffy pit without distinguishing, the AOD pulverization degree is inevitably uncontrollable, so that the AOD slag can be uniformly processed by mixing the AOD initial slag and the AOD reducing slag according to the proportion of 1: 05-2 (preferably 1:1) according to the difference of the components of the AOD initial slag and the AOD reducing slag.
Comparing the three-segment AOD mixed slag prepared in comparative examples 6, 7, 8 and 9 with the three-segment AOD mixed slag prepared in example 2, it can be found that the three-segment AOD mixed slag prepared in example 2 has a lower degree of pulverization. In the scheme, the inventor finds that the time of only pumping water and reducing the temperature cannot meet the reaction time inside the AOD furnace slag, so that appropriate slag smoldering time needs to be added, 60min slag smoldering time is selected in the scheme, the reaction time inside the AOD furnace slag can be guaranteed to the greatest extent, the slag smoldering time is short (0min and 30min), the reaction time is not enough, the slag smoldering time is long (90min), and the reaction is not carried out any more, so that the process time is wasted.
Comparing the three-segment AOD mixed slag prepared in comparative examples 4 and 5 with the three-segment AOD mixed slag prepared in example 2, it can be found that the three-segment AOD mixed slag prepared in example 2 has a lower pulverization degree. In this scenario, the inventors found that rapid cooling of the AOD slag can cause C3S to condense, preventing the formation of C2S. And even if it has been converted to a fraction of C2S, the transition from β to γ is avoided, so swelling and bursting are minimized. After the slag is rapidly cooled, the area occupied by the crystal is greatly reduced, and the polycrystal beta of the C2S is stable at low temperature, so that the volume expansion can be inhibited, and the polycrystal beta cannot burst to form dust. Therefore, in the step of water fetching in the first stage of the hot stuffy pit, the water fetching amount is 30t/h, and the AOD slag can be rapidly cooled to 675 ℃ by cooling under the water fetching amount; the water pumping amount is too small (25t/h), so that the cooling is not rapid, and the aim of rapid cooling cannot be fulfilled; too large a water injection (35t/h) results in too rapid a temperature drop and insufficient internal reaction time of the AOD slag.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The AOD slag treatment method is characterized by comprising the following steps:
1) inhibiting pulverization;
respectively adding borax with the respective mass ratio of 1-5% into the AOD initial-stage slag and the AOD reducing slag to respectively obtain AOD initial-stage mixed slag and AOD reducing mixed slag;
2) preparing AOD mixed slag;
mixing the AOD initial mixed slag and the AOD reduction mixed slag according to the mass ratio of 1: 0.5-2 to obtain AOD mixed slag;
3) adding the AOD mixed slag into a hot stuffy pit;
4) hot-stuffy pit first-stage water fetching;
watering and spraying the AOD mixed slag in the hot disintegrating pit for cooling, disintegrating the slag after watering and spraying for cooling, and disintegrating the slag to obtain a section of AOD mixed slag;
5) hot stuffy pit two-stage water fetching;
continuously watering and spraying the first-stage AOD mixed slag for cooling, stewing the slag after watering and spraying the cooled slag, and stewing the slag to obtain second-stage AOD mixed slag;
6) water is taken out from the hot stuffy pit three sections;
continuously carrying out water spraying and cooling on the two-section AOD mixed slag, carrying out slag smoldering after the water spraying and cooling are carried out, and obtaining three-section AOD mixed slag after the slag smoldering;
7) slag is discharged from the hot stuffy pit;
digging out the three-stage AOD mixed slag from the hot stuffy pit.
2. The method according to claim 1, wherein in the step of suppressing pulverization, borax is added into each of the AOD initial slag and the AOD reducing slag in an amount of 2% by mass, so as to obtain AOD initial mixed slag and AOD reducing mixed slag.
3. The AOD slag treatment method according to claim 2, wherein in the AOD mixed slag preparation step, the AOD initial mixed slag and the AOD reduction mixed slag are mixed in a mass ratio of 1:1 to obtain the AOD mixed slag.
4. The method for treating the AOD slag according to claim 3, wherein the temperature of the AOD slag mixture in the step of adding the AOD slag mixture into the hot stuffy pit is 1100-1300 ℃.
5. The method for treating the AOD slag according to claim 4, wherein the temperature of the AOD slag mixture is 1200 ℃ in the step of adding the AOD slag mixture into the hot stuffy pit.
6. The AOD slag treatment method according to claim 5, wherein in the step of water removal in the hot stuffy pit section, the water removal spraying cooling time is 120min, the water removal amount is 30t/h, and the slag stuffy time is 60 min.
7. The AOD slag treatment method according to claim 6, wherein in the hot stuffy pit two-stage water fetching step, the water fetching and spraying cooling time is 120min, the water fetching amount is 20t/h, and the slag stuffy time is 60 min.
8. The AOD slag treatment method according to claim 7, wherein in the three-stage water-fetching step of the hot stuffy pit, the water-fetching spraying cooling time is 60min, the water-fetching amount is 15t/h, and the slag stuffy time is 60 min.
9. The AOD slag treatment method according to claim 8, wherein a plurality of automatic water spraying nozzles are uniformly distributed on a pit cover of the hot stuffy pit, and two rows of automatic water spraying nozzles are uniformly arranged on a pit wall of the hot stuffy pit.
10. The AOD slag processing method according to claim 9, wherein the automatic water spraying nozzle is a water mist nozzle.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002555A (en) * | 2010-12-01 | 2011-04-06 | 山西太钢不锈钢股份有限公司 | Method for treating refining slag in stainless steel smelting by using argon oxygen decarburizing furnace |
| CN102230039A (en) * | 2011-06-03 | 2011-11-02 | 山西太钢不锈钢股份有限公司 | Method for cooling stainless steel slag in tank |
| CN103397120A (en) * | 2013-07-26 | 2013-11-20 | 首钢京唐钢铁联合有限责任公司 | Hot braising method for phosphorus removed slag and carbon removed slag |
| CN106834570A (en) * | 2016-11-30 | 2017-06-13 | 振石集团东方特钢有限公司 | A kind of method of stainless steel slag comprehensive utilization of resources |
-
2020
- 2020-10-15 CN CN202011100460.3A patent/CN112280913B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002555A (en) * | 2010-12-01 | 2011-04-06 | 山西太钢不锈钢股份有限公司 | Method for treating refining slag in stainless steel smelting by using argon oxygen decarburizing furnace |
| CN102230039A (en) * | 2011-06-03 | 2011-11-02 | 山西太钢不锈钢股份有限公司 | Method for cooling stainless steel slag in tank |
| CN103397120A (en) * | 2013-07-26 | 2013-11-20 | 首钢京唐钢铁联合有限责任公司 | Hot braising method for phosphorus removed slag and carbon removed slag |
| CN106834570A (en) * | 2016-11-30 | 2017-06-13 | 振石集团东方特钢有限公司 | A kind of method of stainless steel slag comprehensive utilization of resources |
Non-Patent Citations (1)
| Title |
|---|
| 仪桂兰 等: "抑制AOD不锈钢渣粉化的试验研究", 《炼钢》 * |
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