CN112877505A - Fluorine-free KR desulfurizer and desulfurization method thereof - Google Patents
Fluorine-free KR desulfurizer and desulfurization method thereof Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 84
- 230000023556 desulfurization Effects 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 34
- 229910021538 borax Inorganic materials 0.000 claims abstract description 23
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 23
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004571 lime Substances 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 18
- 229910021532 Calcite Inorganic materials 0.000 claims abstract description 14
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 12
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 238000003682 fluorination reaction Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011737 fluorine Substances 0.000 abstract description 3
- 229910052731 fluorine Inorganic materials 0.000 abstract description 3
- 240000006909 Tilia x europaea Species 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000004328 sodium tetraborate Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a fluorine-free KR desulfurizer and a desulfurization method thereof, and belongs to the field of molten iron pretreatment production. The desulfurizer of the invention comprises the following components by weight percent: active lime: 75% -85%, aluminum ash: 6% -9%, sodium borate calcite: 6% -12%, calcium carbide: 3 to 4 percent. The desulfurization method comprises the following steps: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment; stirring by a lower stirring paddle, and continuously spraying a desulfurizing agent into the molten iron tank through a spray gun in the stirring process; and after the treatment is finished, removing the desulphurization slag. Aiming at the problems of pollution of a fluorine-containing desulfurizer and low use efficiency of the desulfurizer in the conventional KR desulfurization process, the invention provides the fluorine-free KR desulfurizer and the desulfurization method thereof, which improve the use efficiency of the desulfurizer and reduce the production cost on the premise of realizing non-fluorination of the desulfurizer.
Description
Technical Field
The invention relates to the technical field of molten iron pretreatment, in particular to a fluorine-free KR desulfurizing agent and a desulfurizing method thereof.
Background
In addition to a few steel grades, such as sulfur free-cutting steels, sulfur is one of the major detrimental elements in the steel, which creates a "hot-brittle" phenomenon that deteriorates the processing and mechanical properties of the steel. With the development of industries such as petroleum and automobiles, the requirements for the quality of steel products are higher and higher, and the requirements for impurity elements (such as sulfur) in steel are more and more strict, for example, the sulfur content in most of low-temperature steel, marine steel, hydrogen-induced crack resistant steel, steel for partial thick plates, steel for low-temperature containers (9Ni steel) and the like is less than 0.01%, even less than 0.001%, so that desulfurization becomes one of important links in the production process of steel.
In order to meet the quality requirement of steel products, the molten iron pretreatment desulfurization technology becomes an essential link in the production of high-purity clean steel products, wherein the KR method desulfurization process is most widely applied. At present, the desulfurizing agent of KR desulfurization process of domestic main iron and steel enterprises is lime, and a certain amount of CaF is added for promoting lime to dissolve2The dissolution is promoted, the desulfurization capability is effectively improved, however, CaF2Can destroy KR stirring head and ladle lining, and can pollute environment and harm human health.
Through search, numerous patents have been published on the application of KR desulfurizer and desulfurization method, such as Chinese patents CN108396092A, CN110117687A and CN110468255A, which disclose "a fluorine-free KR desulfurizer, its preparation method and desulfurization method", "a KR desulfurizer and desulfurization method", and "a fluorine-free KR desulfurizer, its preparation and use methods", respectively, by using Al2O3To replace CaF2. For another example, Chinese patent CN110669894 discloses a fluorine-free KR desulfurizing agent and a preparation method thereof, which adopts Al2O3To and B2O3To substitute CaF together2. Although the above patent realizes non-fluorination of desulfurizing agent, the solubilizing effect is not as good as CaF2And as with the fluorine-containing desulfurizer, the traditional feeding method is adopted in the desulfurization process, so that the desulfurizer is easy to generate the phenomena of bonding and aggregation in the desulfurization process, and meanwhile, because the desulfurizer still contains about 50 percent of unreacted free CaO, the utilization efficiency of the desulfurizer is seriously reduced, and the waste of raw materials and the increase of cost are caused.
Therefore, the invention provides a novel fluorine-free low-melting-point desulfurizer, and a novel desulfurization method is adopted, so that the use efficiency of the desulfurizer is improved and the production cost is reduced on the premise of realizing the non-fluorination of the desulfurizer.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the problems of pollution of a fluorine-containing desulfurizer and low use efficiency of the desulfurizer in the conventional KR desulfurization process, the invention provides the fluorine-free KR desulfurizer and the desulfurization method thereof, which improve the use efficiency of the desulfurizer and reduce the production cost on the premise of realizing non-fluorination of the desulfurizer.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a fluorine-free KR desulfurizer and a desulfurization method thereof, wherein the desulfurizer comprises the following components in percentage by weight: active lime: 75% -85%, aluminum ash: 6% -9%, sodium borate calcite: 6% -12%, calcium carbide: 3 to 4 percent.
Further, sodium borate calcite contains B2O3The weight percentage content of the sodium-containing material is more than or equal to 45 percent, and Na2The weight percentage content of O is more than or equal to 5 percent.
Furthermore, the weight percentage content of CaO in the lime is more than or equal to 90 percent, and SiO is2The content of the components is less than or equal to 2 percent by weight.
Further, the aluminum ash comprises the following chemical components in percentage by weight: al: 30% -50% of Al2O3：15％-35％， SiO2：4％-8％，MgO：2％-5％，Na2O: 2 to 4 percent of the total weight of the iron oxide and the MnO, and less than or equal to 1.0 percent of the total weight of the FeO and the MnO.
Further, CaC in calcium carbide2The content of the components is more than or equal to 75 percent by weight.
Furthermore, the particle size of the desulfurizing agent is less than or equal to 100 mu m.
A desulfurization method of fluorine-free KR desulfurizer comprises the following desulfurization steps:
s1: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment;
s2: stirring by a lower stirring paddle, and continuously spraying a desulfurizing agent into the molten iron tank through a spray gun in the stirring process;
s3: and after the treatment is finished, removing the desulphurization slag.
Furthermore, in the desulfurization treatment process, the stirring speed of the stirring paddle is 90r/min-130r/min, the desulfurization treatment time is 8min-15min, and the temperature of molten iron is more than or equal to 1250 ℃.
Further, the gas used in the lance is N2Or Ar, and the gas flow rate of the spray gun is 5Nm3/min-18Nm3/min。
Furthermore, the adding speed of the desulfurizer is 0.5kg/t/min-1.0 kg/t/min.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the fluorine-free KR desulfurizer, the sodium borate calcite is added, so that the fluorine-free KR desulfurizer can not only realize the fluorine-free effect of the desulfurizer and reduce the environmental pollution, but also effectively promote the dissolution of limestone and improve the use efficiency of the desulfurizer, and further improve the desulfurization effect; however, the content of the sodium borate calcite cannot be too high, the liquid phase ratio of limestone particles is too high due to too high content, the phenomenon of agglomeration of the limestone particles is easily caused, the utilization efficiency of the desulfurizer is seriously reduced, the desulfurization efficiency is reduced, and the waste of raw materials and the increase of the cost are caused.
(2) According to the desulfurization method of the fluorine-free KR desulfurizer, the composition and the adding mode of the desulfurizer are controlled, so that the agglomeration phenomenon of the desulfurizer is effectively reduced, the utilization rate and the desulfurization efficiency of the desulfurizer are improved, the using amount of the desulfurizer is reduced by more than 15%, and the desulfurization rate is improved to more than 90%.
(3) According to the desulfurization method of the fluorine-free KR desulfurizer, the lower stirring paddle is used for stirring, the desulfurizer is continuously sprayed into the molten iron tank through the spray gun in the stirring process, and the desulfurizer is uniformly and continuously sprayed into the molten iron tank through the spray gun, so that the agglomeration phenomenon of the desulfurizer, which is caused by the conventional one-time feeding mode, can be avoided, and the use efficiency and the desulfurization effect of the desulfurizer are prevented from being influenced.
Detailed Description
For a further understanding of the present invention, reference will now be made to the following examples.
Example 1
The fluorine-free KR desulfurizing agent of the embodiment comprises the following components in percentage by weight: active lime: 75% -85%, aluminum ash: 6% -9%, sodium borate calcite: 6% -12%, calcium carbide: 3 to 4 percent. Compared with common lime, the active lime has higher reaction efficiency and can effectively improve the desulfurization effect by adopting the active lime as the main component of the desulfurization agent. Wherein B in sodium borate calcite2O3The weight percentage content of the sodium-containing material is more than or equal to 45 percent, and Na2The weight percentage content of O is more than or equal to 5 percent. B in sodium borate dickite2O3And Na2O can effectively promote the dissolution of limestone, improves the service efficiency of desulfurizer, and then improves the desulfurization effect, but sodium borate calcite content can not be too high, and too high can lead to limestone particles liquid phase ratio too high, takes place limestone reunion phenomenon easily, has seriously reduced the utilization efficiency of desulfurizer, reduces desulfurization efficiency, and causes the waste of raw and other materials and the increase of cost. Specifically, the desulfurizing agent in this embodiment includes the following components in percentage by weight: active lime: 80%, aluminum ash: 7%, sodium borate calcite: 10%, calcium carbide: 3 percent. Wherein B in sodium borate calcite2O3Is 48 wt% of Na2The weight percentage of O is 7 percent. The particle size of the desulfurizer is less than or equal to 100 mu m. Specifically, the particle size of the desulfurizing agent in this example was 50 μm.
In this embodiment, the content of CaO in the lime is greater than or equal to 90% by weight, and SiO is contained in the lime2The content of the components is less than or equal to 2 percent by weight. SiO 22The content is controlled in a lower range, otherwise, dicalcium silicate is generated, and the dicalcium silicate wraps lime which is difficult to dissolve, so that the utilization efficiency and the desulfurization efficiency of the desulfurizer are seriously reduced. CaC in the calcium carbide2The content of the components is more than or equal to 75 percent by weight. Specifically, CaO in lime in this example91% by weight of SiO2The content of the calcium carbide is 2 percent by weight, and the CaC in the calcium carbide2Is contained in an amount of 78% by weight.
The aluminum ash in the embodiment comprises the following chemical components in percentage by weight: al: 30% -50% of Al2O3：15％-35％， SiO2：4％-8％，MgO：2％-5％，Na2O: 2 to 4 percent of the total weight of the iron oxide and the MnO, and less than or equal to 1.0 percent of the total weight of the FeO and the MnO. Specifically, the aluminum ash in this embodiment includes the following chemical components by weight percent: al: 45% of Al2O3：28％，SiO2：5％，MgO：3％， Na2O: 4 percent, and the sum of FeO and MnO is 1.0 percent.
A desulfurization method of fluorine-free KR desulfurizer comprises the following desulfurization steps:
s1: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment, wherein the temperature of the molten iron is more than or equal to 1250 ℃. Specifically, in this example, the molten iron temperature was 1290 ℃ and the inbound S content was 0.037%.
S2: stirring by a lower stirring paddle, wherein the stirring speed of the stirring paddle is 90r/min-130r/min, continuously spraying a desulfurizing agent into the molten iron tank by a spray gun in the stirring process, the adding speed of the desulfurizing agent is 0.5kg/t/min-1.0kg/t/min, and the desulfurization treatment time is 8min-15min, wherein in the desulfurization treatment process, the gas adopted by the spray gun is N2Or Ar and the gas flow of the lance is 5Nm3/min-18Nm3And/min. Specifically, in this embodiment, the stirring speed of the stirring paddle is 100r/min, and the gas used by the spray gun is N2The gas flow of the spray gun is 8Nm3And/min, the adding speed of the desulfurizer is 0.8kg/t/min, and the adding amount of the desulfurizer is 8.0kg/t molten iron. The desulfurizer is uniformly and continuously sprayed into the molten iron tank through the spray gun, so that the phenomenon of desulfurizer agglomeration as in the traditional one-time feeding mode can be avoided, and the use efficiency and the desulfurization effect of the desulfurizer are prevented from being influenced.
S3: and after the desulfurization treatment is finished, removing the desulfurization slag.
Compared with the comparative example, the advantages of the embodiment are mainly reflected in that the desulfurization rate of the end point is greatly improved and the desulfurization of the desulfurizing agent is reduced on the premise of realizing the fluoride-free of the desulfurizing agentConsumption and environmental pollution are reduced. Compared with the comparative example 1 (conventional desulfurizer), the desulfurization rate of the embodiment is improved by 15.64 percent; the desulfurization rate of this example was improved by 19.59% as compared to comparative example 2 (which did not contain sodium borate calcite); comparison with comparative example 3 (addition of soda NaCO)3) Compared with the prior art, the desulfurization rate of the embodiment is improved by 25.54 percent; compared with comparative example 4 (adding borax), the desulfurization rate of the embodiment is improved by 22.09%; and the consumption of the desulfurizer is reduced by 18.37 percent.
TABLE 1 desulfurization agent-related parameters
TABLE 2 desulfurization effect and desulfurizing agent consumption
Example 2
The KR desulfurization agent is substantially as in example 1, except that the KR desulfurization agent comprises the following components in percentage by weight: active lime: 79 percent, aluminum ash: 7%, sodium borate calcite: 11%, calcium carbide: 4 percent. Wherein B in sodium borate calcite2O349% by weight of Na2The weight percentage of O is 6 percent. The particle size of the desulfurizing agent is 80 μm.
In this example, the weight percentage content of CaO in the lime is 93%, and SiO is21% by weight of calcium carbide2The weight percentage of (B) is 80%.
The aluminum ash in the embodiment comprises the following chemical components in percentage by weight: al: 47% of Al2O3：26％，SiO2：6％， MgO：4％，Na2O: 3 percent, and the sum of FeO and MnO is 0.9 percent.
A desulfurization method of fluorine-free KR desulfurizer comprises the following desulfurization steps:
s1: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment, wherein the temperature of the molten iron is 1330 ℃, and the content of S entering the station is 0.039%.
S2: stirring by a lower stirring paddle, wherein the stirring speed of the stirring paddle is 110r/min, continuously spraying a desulfurizing agent into the molten iron tank by a spray gun in the stirring process, the adding speed of the desulfurizing agent is 0.6kg/t/min, and the desulfurization treatment time is 15min, wherein in the desulfurization treatment process, the gas adopted by the spray gun is Ar, and the gas flow of the spray gun is 10Nm3And the addition amount of the desulfurizing agent is 7.8kg/t molten iron per min.
S3: and after the desulfurization treatment is finished, removing the desulfurization slag.
Compared with the comparative example, the method has the advantages that the final desulfurization rate is greatly improved, the consumption of the desulfurizing agent is reduced, and the environmental pollution is reduced on the premise of realizing the non-fluorination of the desulfurizing agent. Compared with the comparative example 1 (conventional desulfurizer), the desulfurization rate of the embodiment is improved by 13.36 percent; compared with comparative example 2 (without sodium borate calcite), the desulfurization rate of the embodiment is improved by 17.31%; comparison with comparative example 3 (addition of soda NaCO)3) Compared with the prior art, the desulfurization rate of the embodiment is improved by 23.26%; compared with comparative example 4 (adding borax), the desulfurization rate of the embodiment is improved by 19.81%; and the consumption of the desulfurizer is reduced by 20.41 percent.
Example 3
The KR desulfurization agent is substantially as in example 1, except that the KR desulfurization agent comprises the following components in percentage by weight: active lime: 81%, aluminum ash: 8%, sodium borate calcite: 8% of calcium carbide: 3 percent. Wherein B in sodium borate calcite2O347% by weight of Na2The weight percentage of O is 7 percent. The particle size of the desulfurizing agent is 30 μm.
In this example, the lime contains 95% by weight of CaO and SiO21% by weight of calcium carbide2The weight percentage of (B) is 76%.
The aluminum ash in the embodiment comprises the following chemical components in percentage by weight: al: 42% of Al2O3：32％，SiO2：5％， MgO：4％，Na2O: 4 percent, and the sum of FeO and MnO is 0.9 percent.
A desulfurization method of fluorine-free KR desulfurizer comprises the following desulfurization steps:
s1: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment, wherein the temperature of the molten iron is 1345 ℃, and the content of S entering the station is 0.04%.
S2: stirring by a lower stirring paddle, wherein the stirring speed of the stirring paddle is 100r/min, continuously spraying a desulfurizing agent into the molten iron tank by a spray gun in the stirring process, the adding speed of the desulfurizing agent is 0.7kg/t/min, and the desulfurization treatment time is 10min, wherein in the desulfurization treatment process, the gas adopted by the spray gun is Ar, and the gas flow of the spray gun is 7Nm3And the adding amount of the desulfurizing agent is 6.5kg/t molten iron per min.
S3: and after the desulfurization treatment is finished, removing the desulfurization slag.
Compared with the comparative example, the method has the advantages that the final desulfurization rate is greatly improved, the consumption of the desulfurizing agent is reduced, and the environmental pollution is reduced on the premise of realizing the non-fluorination of the desulfurizing agent. Compared with the comparative example 1 (conventional desulfurizer), the desulfurization rate of the embodiment is improved by 13.55 percent; the desulfurization rate of this example was improved by 17.50% as compared to comparative example 2 (which did not contain sodium borate calcite); comparison with comparative example 3 (addition of soda NaCO)3) Compared with the prior art, the desulfurization rate of the embodiment is improved by 23.45 percent; compared with comparative example 4 (adding borax), the desulfurization rate of the embodiment is improved by 20.00%; and the consumption of the desulfurizing agent is reduced by 33.67 percent.
More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined (e.g., between various embodiments), adapted and/or substituted as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. For example, in the present invention, the term "preferably" is not exclusive, and it means "preferably, but not limited to" herein. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Claims (10)
1. A fluorine-free KR desulfurizing agent is characterized in that: the desulfurizer comprises the following components in percentage by weight: active lime: 75% -85%, aluminum ash: 6% -9%, sodium borate calcite: 6% -12%, calcium carbide: 3 to 4 percent.
2. The fluorine-free KR desulfurizing agent according to claim 1, wherein: b in the sodium borate calcite2O3The weight percentage content of the sodium-containing material is more than or equal to 45 percent, and Na2The weight percentage content of O is more than or equal to 5 percent.
3. The fluorine-free KR desulfurizing agent according to claim 1, wherein: the weight percentage content of CaO in the lime is more than or equal to 90 percent, and SiO is2The content of the components is less than or equal to 2 percent by weight.
4. The fluorine-free KR desulfurizing agent according to claim 1, wherein: the aluminum ash comprises the following chemical components in percentage by weight: al: 30% -50% of Al2O3：15％-35％，SiO2：4％-8％，MgO：2％-5％，Na2O: 2 to 4 percent of the total weight of the iron oxide and the MnO, and less than or equal to 1.0 percent of the total weight of the FeO and the MnO.
5. The fluorine-free KR desulfurizing agent according to claim 1, wherein: CaC in the calcium carbide2The content of the components is more than or equal to 75 percent by weight.
6. The fluorine-free KR desulfurizing agent according to any one of claims 1 to 5, wherein: the particle size of the desulfurizer is less than or equal to 100 mu m.
7. The method for desulfurizing a fluorine-free KR desulfurizing agent according to any one of claims 1 to 5, wherein: the method comprises the following desulfurization steps:
s1: before treatment, the molten iron in the molten iron tank is subjected to slag skimming treatment;
s2: stirring by a lower stirring paddle, and continuously spraying a desulfurizing agent into the molten iron tank through a spray gun in the stirring process;
s3: and after the treatment is finished, removing the desulphurization slag.
8. The method of claim 7, wherein the desulfurization of KR desulfurization agent is carried out by the following steps: in the desulfurization treatment process, the stirring speed of the stirring paddle is 90r/min-130r/min, the desulfurization treatment time is 8min-15min, and the temperature of molten iron is more than or equal to 1250 ℃.
9. The method of claim 7, wherein the desulfurization of KR desulfurization agent is carried out by the following steps: the gas used by the spray gun is N2Or Ar, and the gas flow rate of the spray gun is 5Nm3/min-18Nm3/min。
10. The method of claim 8 or 9, wherein the method comprises the following steps: the addition rate of the desulfurizer is 0.5kg/t/min-1.0 kg/t/min.
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