CN111621619A - Desulfurizer for reducing corrosion of RH refractory material and preparation process thereof - Google Patents
Desulfurizer for reducing corrosion of RH refractory material and preparation process thereof Download PDFInfo
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- CN111621619A CN111621619A CN202010494462.9A CN202010494462A CN111621619A CN 111621619 A CN111621619 A CN 111621619A CN 202010494462 A CN202010494462 A CN 202010494462A CN 111621619 A CN111621619 A CN 111621619A
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- 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
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- 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
- C21C7/10—Handling in a vacuum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a desulfurizer for reducing corrosion of RH refractory materials and a preparation process thereof, belonging to the technical field of desulfurizers and comprising the following raw materials in percentage by weight: 40 to 60 percent of CaO and 60 to 40 percent of Al2O3、MgO≤2％、CaF2≤1％、SiO2Less than or equal to 3 percent, CaO and Al2O3The weight percentage of the formed compound is more than 95 percent, the weight percentage of CaO in the compound is 60 percent, and Al2O3The weight percentage is 40%. Increasing CaO and Al in raw materials2O3Proportioning, reducing MgO and SiO2Content of CaF not added2The pollution is reduced, CaO is lime generated by calcining natural gas, the burning is reduced, and the carbon increment is small; the etching to RH resistant material is small.
Description
Technical Field
The invention relates to the technical field of desulfurizer, in particular to a desulfurizer for reducing corrosion of RH refractory materials and a preparation process thereof.
Background
A low-melting-point RH desulfurizer with the patent number of CN201010597181.2, belonging to the technical field of steel making. It is characterized in that: is CaO-Al2O3Adding MgO, BaO and CaF into the basic slag system2、SiO2The RH desulfurizer comprises the following raw materials by weight percent: 45 to 50 percent of CaO and 20 to 25 percent of Al2O3，10％～15％BaO，6％～8％MgO，0～3％CaF2，4％SiO2. The melting point is 1200-1300 ℃. Pre-melting treatment is carried out before use, and the particle size of the desulfurizer is controlled to be 3-5 mm. The advantages are that: the desulfurization effect is equivalent to that of the traditional RH desulfurizer, the melting point is 200 ℃ lower than that of the traditional RH desulfurizer, and the addition of BaO not only improves the desulfurization rate of the desulfurizer, but also reduces the melting point of the desulfurizer and CaF2The amount of (A) to (B). Improves the melting speed of the desulfurizer, and lightens the temperature drop of the molten steel during RH desulfurization treatment.
A high alkalinity fluorine-free RH desulfurizer with the patent number of CN201010617119.5 belongs to the technical field of steel making. It is characterized in that: with CaO-Al2O3-SiO2The slag system is a basic slag system, and BaO is added to reduce the melting point of the desulfurizer and improve the optical alkalinity of the desulfurizer so that the optical alkalinity of the desulfurizer can reach 0.83. By adding B2O3The melting point of the desulfurizer is reduced, and the melting speed of the desulfurizer is increased. Therefore, under the condition of no fluorine, the RH desulfurizer can be melted quickly without reducing the optical alkalinity of the RH desulfurizer. And the formula does not contain fluoride which has serious influence on the environment and seriously corrodes equipment, so that the corrosivity of the desulfurizer is reduced and the service life of the RH equipment is prolonged. Thereby solving the contradiction between high optical alkalinity, low melting point and rapid melting of the RH desulfurizer under the fluorine-free condition and improving the efficiency of RH refining on the desulfurization treatment of the weakly deoxidized steel.
However, the above patents all reduce the melting point of the desulfurizer by adding BaO and reduce the usage of fluoride, and for the desulfurizer in the refractory production process, the purpose of lowering the melting point is achieved without adding BaO, but the etching of the desulfurizer on the RH refractory is reduced by increasing the C content, and the existing desulfurizer and the desulfurizer in the above patents all have carbon, MgO and CaF2、BaO、SiO2The amount of the corrosion inhibitor is high, and the corrosion resistance to RH resistant materials is high, and the ignition loss is high.
Disclosure of Invention
The invention aims to provide a desulfurizer for reducing RH refractory material erosion and a preparation process thereof, which can improve CaO and Al in raw materials2O3Proportioning, reducing MgO and SiO2Content of CaF not added2Reduction of pollution, CThe aO is lime generated by calcining natural gas, so that the burning is reduced, and the carburetion amount is small; the RH resistant material is etched little to solve the problems proposed in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a desulfurizer for reducing corrosion of RH refractory materials comprises the following raw materials by weight percent: 40 to 60 percent of CaO and 60 to 40 percent of Al2O3、MgO≤2％、CaF2≤1％、SiO2≤3％。
Further, the CaO and Al2O3The weight percentage of the formed compound is more than 95 percent, the weight percentage of CaO in the compound is 60 percent, and Al2O3The weight percentage is 40%.
Further, the material comprises the following raw materials in percentage by weight: 50% CaO, 48% Al2O3。
Further, the material comprises the following raw materials in percentage by weight: 55% CaO, 43% Al2O3。
Further, the material comprises the following raw materials in percentage by weight: 60% CaO, 38% Al2O3。
According to another aspect of the invention, a preparation process of a desulfurizer for reducing corrosion of RH refractory materials is provided, which comprises the following steps:
s1: preparing CaO;
s2: pretreating the material, selecting CaO and Al2O3；
S3: grinding the CaO and Al obtained in S22O3Putting the mixture into a ball mill, and grinding the mixture into powder with the particle size of 0.03-0.075 mm to prepare a desulfurizer;
s4: mixing, and proportioning the finished CaO and Al2O3Mixing in a blender, and drying.
Further, S1 further includes the following steps:
s101: selecting the density of more than 2560kg/m3And limestone with few impurities;
s102: crushing limestone, removing impurities from the limestone by using an impurity removal screening machine, and screening limestone particles with the diameter of 50-150 mm;
s103: evenly spreading limestone in a gas-fired lime kiln, spraying natural gas into the gas-fired lime kiln, heating to 890-1050 ℃, and calcining for 2-4 hours to obtain lime with CaO as a main component.
Further, in S2, Al is extracted in advance from bauxite2O3。
Furthermore, the injection flow rate of the natural gas in S103 is 1500-2500 Nm3/h, and the injection pressure is 0.40-0.60 MPa.
Further, CaO and Al selected in S22O3Without addition of CaF2BaO, small granularity, high smelting speed in molten steel, high desulfurizing speed and less corrosion to RH refractory.
Compared with the prior art, the invention has the beneficial effects that:
1. the desulfurizer for reducing the corrosion of RH refractory materials and the preparation process thereof provided by the invention can improve CaO and Al in raw materials2O3Proportioning, no addition of MgO and CaF2、BaO、SiO2Reduction of CaF2And the use amount of BaO reduces pollution.
2. The desulfurizer for reducing the corrosion of RH refractory materials and the preparation process thereof do not add CaF2And BaO, and the desulfurizer has small etching to RH refractory materials when in use.
3. The invention provides a desulfurizer for reducing RH refractory corrosion and a preparation process thereof, CaO used is lime generated by calcining natural gas, is reduced by burning, and is added with Al purified by bauxite2O3The carbureting amount is less than 3PPm after adding molten steel, and the method is particularly suitable for the desulfurization production of ultra-low carbon steel.
Drawings
FIG. 1 is a flow chart of the process for preparing the desulfurizing agent for reducing the corrosion of RH refractory according to the present invention;
FIG. 2 is a flow chart for preparing CaO according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The first embodiment is as follows:
referring to fig. 1-2, a desulfurizing agent for reducing RH refractory corrosion includes the following raw materials by weight percent: 40 to 60 percent of CaO and 60 to 40 percent of Al2O3、MgO≤2％、CaF2≤1％、SiO2Less than or equal to 3 percent. The CaO and Al2O3The weight percentage of the formed compound is more than 95 percent, the weight percentage of CaO in the compound is 60 percent, and Al2O3The weight percentage is 40%.
In order to better show the flow of preparing the desulfurizer for reducing the corrosion of the RH refractory, the present embodiment now provides a preparation process of the desulfurizer for reducing the corrosion of the RH refractory, which includes the following steps:
step 1: preparing CaO;
selecting the density of more than 2560kg/m3And limestone with few impurities; the main component of limestone is CaCO3(ii) a The limestone has high calcium content, high density, high calcining difficulty, long calcining time and high calcining temperature, and the calcined lime has good quality, so that the selected lime has CaO content higher than 52%, Mg content lower than 3%, and SiO2High quality limestone with content less than 1%.
The method comprises the steps of crushing limestone, removing impurities from the limestone by using an impurity removal screening machine, screening limestone blocks with the diameter of 50-150 mm, and during calcination, avoiding incomplete calcination and overburning of limestone with different sizes after calcination, wherein the limestone blocks needing to be screened are basically consistent in size, and the calcination uniformity is improved.
Uniformly spreading limestone in a gas-fired lime kiln, spraying natural gas into the gas-fired lime kiln, heating to 900-1050 ℃, and calcining for 2-4 hours to obtain lime with CaO as a main component; the combustion temperature of the natural gas needs to be strictly monitored by a temperature controller, and the limestone is completely calcined and cannot be over-calcined by accurately controlling the calcining temperature and the calcining time, so that the generated lime ash has good quality and less impurities; the natural gas injection flow is 1500-2500 Nm3/h, the injection pressure is 0.40-0.60 MPa, and the lime is fired by using a gas-fired lime kiln, so that the energy can be saved, the temperature in the kiln is uniform, the natural gas is clean energy, the lime is fired by using the natural gas, the environment is protected, and compared with the conventional combustion of blast furnace gas and coke oven gas, the generation of harmful gas is reduced, and the harmful substances are prevented from being attached to the lime.
Step 2: pretreating the material, selecting CaO and Al2O3Extracting Al from bauxite2O3；
And step 3: grinding, the mixture obtained in the step 3 is put into a ball mill to be ground into powder with the particle size of 0.03-0.075 mm, a desulfurizer is prepared, a certain amount of material is weighed and firstly ground once, the material after primary grinding is screened by a screen with the particle size of less than 0.075mm and the particle size of more than 0.03mm, the powder with the particle size of 0.03-0.075 mm in the radial direction is obtained, new material is supplemented to the material with the particle size of more than or equal to 0.075mm, secondary grinding is carried out, screening is carried out again after grinding, and accordingly, the desulfurizer with the particle size of 0.03-0.075 mm in batches is obtained in a reciprocating mode, wherein the mixture with the larger particle size can be ground again, the particle size of the mixture with the smaller particle size cannot be enlarged, therefore, the particle size of the desulfurizer is controlled by adopting a reciprocating circulating type screening and grinding method, and excessive grinding.
And 4, step 4: mixing, and proportioning the finished CaO and Al2O3Mixing in a blender, and drying.
Example two:
referring to fig. 1-2, a desulfurizing agent for reducing RH refractory corrosion includes the following raw materials by weight percent: 50% CaO, 48% Al2O3Said CaO and Al2O3The weight percentage of the compound is 98%.
In order to better show the flow of preparing the desulfurizer for reducing the corrosion of the RH refractory, the present embodiment now provides a preparation process of the desulfurizer for reducing the corrosion of the RH refractory, which includes the following steps:
step 1: preparing CaO;
selecting the density of more than 2560kg/m3And limestone with few impurities; the main component of limestone is CaCO3(ii) a The limestone has high calcium content, high density, high calcining difficulty, long calcining time and high calcining temperature, and the calcined lime has good quality, so that the selected lime has CaO content higher than 52%, Mg content lower than 3%, and SiO2High quality limestone with content less than 1%.
The limestone is crushed, the limestone is subjected to impurity removal by adopting an impurity removal screening machine, limestone particles with the diameter of 10-30 mm are screened, and in the calcining process, limestone with large particle size needs to be calcined for a long time and has smaller particle size, so that incomplete firing and overburning of limestone with different sizes after calcining are avoided, limestone blocks needing to be screened are basically consistent in size, and the calcining uniformity is improved.
Uniformly spreading limestone in a gas-fired lime kiln, spraying natural gas into the gas-fired lime kiln, heating to 900-1050 ℃, and calcining for 2-4 hours to obtain lime with CaO as a main component; the combustion temperature of the natural gas needs to be strictly monitored by a temperature controller, and the limestone is completely calcined and cannot be over-calcined by accurately controlling the calcining temperature and the calcining time, so that the generated lime ash has good quality and less impurities; the injection flow rate of the natural gas is 1500-2500 Nm3/h, and the injection pressure is 0.40-0.60 MPa. The gas-burning lime kiln is used for burning lime, energy can be saved, the temperature in the kiln is uniform, natural gas is clean energy, the lime is burned by using the natural gas, environment protection is facilitated, and compared with the traditional combustion of blast furnace gas and coke oven gas, the gas-burning lime kiln reduces the generation of harmful gas and avoids harmful substances from being attached to the lime.
Step 2: pretreating the material, selecting CaO and Al2O3And then proportioning the components; extracting Al from bauxite2O3；
And step 3: grinding, the mixture obtained in the step 3 is put into a ball mill to be ground into powder with the particle size of 0.03-0.075 mm, a desulfurizer is prepared, a certain amount of material is weighed and firstly ground once, the material after primary grinding is screened by a screen with the particle size of less than 0.075mm and the particle size of more than 0.03mm, the powder with the particle size of 0.03-0.075 mm in the radial direction is obtained, new material is supplemented to the material with the particle size of more than or equal to 0.075mm, secondary grinding is carried out, screening is carried out again after grinding, and accordingly, the desulfurizer with the particle size of 0.03-0.075 mm in batches is obtained in a reciprocating mode, wherein the mixture with the larger particle size can be ground again, the particle size of the mixture with the smaller particle size cannot be enlarged, therefore, the particle size of the desulfurizer is controlled by adopting a reciprocating circulating type screening and grinding method, and excessive grinding.
And 4, step 4: mixing, and proportioning the finished CaO and Al2O3Mixing in a blender, and drying.
Example three:
referring to fig. 1-2, a desulfurizing agent for reducing RH refractory corrosion includes the following raw materials by weight percent: 60% CaO, 38% Al2O3Said CaO and Al2O3The weight percentage of the compound is 98%.
In order to better show the flow of preparing the desulfurizer for reducing the corrosion of the RH refractory, the present embodiment now provides a preparation process of the desulfurizer for reducing the corrosion of the RH refractory, which includes the following steps:
step 1: preparing CaO;
selecting the density of more than 2560kg/m3And limestone with few impurities; the main component of limestone is CaCO3(ii) a The limestone has high calcium content, high density, high calcining difficulty, long calcining time and high calcining temperature, and the calcined lime has good quality, so that the selected lime has CaO content higher than 52%, Mg content lower than 3%, and SiO2High quality limestone with content less than 1%.
The limestone is crushed, the limestone is subjected to impurity removal by adopting an impurity removal screening machine, limestone particles with the diameter of 10-30 mm are screened, and in the calcining process, limestone with large particle size needs to be calcined for a long time and has smaller particle size, so that incomplete firing and overburning of limestone with different sizes after calcining are avoided, limestone blocks needing to be screened are basically consistent in size, and the calcining uniformity is improved.
Uniformly spreading limestone in a gas-fired lime kiln, spraying natural gas into the gas-fired lime kiln, heating to 900-1050 ℃, and calcining for 2-4 hours to obtain lime with CaO as a main component; the combustion temperature of the natural gas needs to be strictly monitored by a temperature controller, and the limestone is completely calcined and cannot be over-calcined by accurately controlling the calcining temperature and the calcining time, so that the generated lime ash has good quality and less impurities; the natural gas injection flow is 1500-2500 Nm3/h, the injection pressure is 0.40-0.60 MPa, the injection speed is 46-55 kg/min, the lime is fired by adopting a gas-fired lime kiln, energy can be saved, the temperature in the kiln is uniform, the natural gas is clean energy, the lime is fired by using the natural gas, the environment is protected, and compared with the traditional combustion of blast furnace gas and coke oven gas, the generation of harmful gas is reduced, and harmful substances are prevented from being attached to the lime.
Step 2: pretreating the material, selecting CaO and Al2O3And then proportioning the components; extracting Al from bauxite2O3；
And step 3: grinding, the mixture obtained in the step 3 is put into a ball mill to be ground into powder with the particle size of 0.03-0.075 mm, a desulfurizer is prepared, a certain amount of material is weighed and firstly ground once, the material after primary grinding is screened by a screen with the particle size of less than 0.075mm and the particle size of more than 0.03mm, the powder with the particle size of 0.03-0.075 mm in the radial direction is obtained, new material is supplemented to the material with the particle size of more than or equal to 0.075mm, secondary grinding is carried out, screening is carried out again after grinding, and accordingly, the desulfurizer with the particle size of 0.03-0.075 mm in batches is obtained in a reciprocating mode, wherein the mixture with the larger particle size can be ground again, the particle size of the mixture with the smaller particle size cannot be enlarged, therefore, the particle size of the desulfurizer is controlled by adopting a reciprocating circulating type screening and grinding method, and excessive grinding.
And 4, step 4: mixing, and proportioning the finished CaO and Al2O3Mixing in a blender, and drying.
In summary, the following steps: the desulfurizer for reducing the corrosion of RH refractory materials and the preparation process thereof provided by the invention can improve CaO and Al in raw materials2O3Proportioning, no addition of MgO and CaF2、BaO、SiO2Reduction of CaF2The use amount of BaO reduces pollution; CaO is lime calcined by natural gas, and when the desulfurizer is used, the desulfurizer has small corrosion to RH refractory materials, is burnt less, and has small carburetion amount.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions disclosed in the present invention and the equivalent alternatives or modifications thereof within the scope of the present invention.
Claims (10)
1. The desulfurizer for reducing the corrosion of RH refractory materials is characterized by comprising the following raw materials in percentage by weight: 40 to 60 percent of CaO and 60 to 40 percent of Al2O3、MgO≤2％、CaF2≤1％、SiO2≤3％。
2. The desulfurizing agent for reducing RH refractory corrosion according to claim 1, wherein said CaO and Al are2O3The weight percentage of the formed compound is more than 95 percent, the weight percentage of CaO in the compound is 60 percent, and Al2O3The weight percentage is 40%.
3. The desulfurizer for reducing corrosion of RH refractory material as claimed in claim 1, which comprises the following raw materials by weight percent: 50% CaO, 48% Al2O3。
4. The desulfurizer for reducing corrosion of RH refractory material as claimed in claim 1, which comprises the following raw materials by weight percent: 55% CaO, 43% Al2O3。
5. Such asThe desulfurizer for reducing corrosion of RH refractory material as claimed in claim 1, which is characterized by comprising the following raw materials by weight percent: 60% CaO, 38% Al2O3。
6. The preparation process of the desulfurizing agent for reducing RH refractory corrosion according to any one of claims 1 to 5, comprising the following steps:
s1: preparing CaO;
s2: pretreating the material, selecting CaO and Al2O3；
S3: grinding the CaO and Al obtained in S22O3Putting the mixture into a ball mill, and grinding the mixture into powder with the particle size of 0.03-0.075 mm to prepare a desulfurizer;
s4: mixing, and proportioning the finished CaO and Al2O3Mixing in a blender, and drying.
7. The preparation process of the desulfurizing agent for reducing RH refractory corrosion of claim 6, wherein S1 further comprises the following steps:
s101: selecting the density of more than 2560kg/m3And limestone with few impurities;
s102: crushing limestone, removing impurities from the limestone by using an impurity removal screening machine, and screening limestone blocks with the diameter of 50-150 mm;
s103: evenly spreading limestone in a gas-fired lime kiln, spraying natural gas into the gas-fired lime kiln, heating to 890-1050 ℃, and calcining for 2-4 hours to obtain lime with CaO as a main component.
8. The process for preparing desulfurizing agent for reducing RH refractory corrosion as set forth in claim 6, wherein Al is extracted from bauxite as raw material in advance in S22O3。
9. The preparation process of the desulfurizing agent for reducing the corrosion of the RH refractory according to claim 7, wherein the injection flow rate of the natural gas in S103 is 1500-2500 Nm3/h, and the injection pressure is 0.40-0.60 MPa.
10. The preparation process of the desulfurizing agent for reducing RH refractory corrosion as claimed in claim 6, wherein CaO and Al selected from S22O3Does not contain CaF2Small granularity, high smelting speed in molten steel, high desulfurizing speed and less corrosion to RH refractory.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171253A (en) * | 1991-12-24 | 1993-07-09 | Kawasaki Steel Corp | Method for desulfurizing molten steel |
| CN1271021A (en) * | 2000-04-25 | 2000-10-25 | 宝山钢铁股份有限公司 | Pre-smelted steel ladle slag reductant and its preparation |
| CN1804055A (en) * | 2005-01-12 | 2006-07-19 | 宝山钢铁股份有限公司 | Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel |
| CN102312048A (en) * | 2010-06-29 | 2012-01-11 | 鞍钢股份有限公司 | Premelting type desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
| CN103924038A (en) * | 2013-01-14 | 2014-07-16 | 宝山钢铁股份有限公司 | Desulfurizing agent and desulfurizing method for vacuum circulation refining production of ultra-low sulfur steel |
| CN106587667A (en) * | 2016-12-28 | 2017-04-26 | 柳州市昌泉贸易有限公司 | Method for producing active lime powder by calcining limestone |
| CN107793049A (en) * | 2016-08-30 | 2018-03-13 | 河南凤宝特钢有限公司 | A kind of energy-saving processing technique using twin beams kiln calcined limestone |
-
2020
- 2020-06-03 CN CN202010494462.9A patent/CN111621619A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171253A (en) * | 1991-12-24 | 1993-07-09 | Kawasaki Steel Corp | Method for desulfurizing molten steel |
| CN1271021A (en) * | 2000-04-25 | 2000-10-25 | 宝山钢铁股份有限公司 | Pre-smelted steel ladle slag reductant and its preparation |
| CN1804055A (en) * | 2005-01-12 | 2006-07-19 | 宝山钢铁股份有限公司 | Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel |
| CN102312048A (en) * | 2010-06-29 | 2012-01-11 | 鞍钢股份有限公司 | Premelting type desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
| CN103924038A (en) * | 2013-01-14 | 2014-07-16 | 宝山钢铁股份有限公司 | Desulfurizing agent and desulfurizing method for vacuum circulation refining production of ultra-low sulfur steel |
| CN107793049A (en) * | 2016-08-30 | 2018-03-13 | 河南凤宝特钢有限公司 | A kind of energy-saving processing technique using twin beams kiln calcined limestone |
| CN106587667A (en) * | 2016-12-28 | 2017-04-26 | 柳州市昌泉贸易有限公司 | Method for producing active lime powder by calcining limestone |
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