CN107356624B - Method for judging melting speed of crystallizer covering slag - Google Patents
Method for judging melting speed of crystallizer covering slag Download PDFInfo
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- CN107356624B CN107356624B CN201710396245.4A CN201710396245A CN107356624B CN 107356624 B CN107356624 B CN 107356624B CN 201710396245 A CN201710396245 A CN 201710396245A CN 107356624 B CN107356624 B CN 107356624B
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Abstract
The invention discloses a method for judging the melting speed of crystallizer covering slag, which comprises the following steps: grinding the casting powder slag sample, and blending with dextrin to prepare a triangular conical standard sample; using a rectangular high-temperature ceramic gasket, wherein the high-temperature ceramic gasket is provided with a triangular prism groove, the bottom area of the triangular prism groove is the same as that of a triangular conical standard sample, placing the triangular conical standard sample in the triangular prism groove, and drying the high-temperature ceramic gasket and the triangular conical standard sample; and (3) putting the high-temperature ceramic gasket and the triangular conical standard sample into an ash melting point tester, measuring the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by using the ash melting point tester, and judging the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by analyzing the time corresponding to the shape change characteristics of the sample in the heating process. The method can accurately judge the melting speed of the covering slag added on the steel liquid surface of the crystallizer, the test temperature is closer to the actual production, the judgment phenomenon is visual, and the repeatability is obviously improved.
Description
Technical Field
The invention relates to a continuous casting covering slag technology, in particular to a method for judging the melting speed of the covering slag of a crystallizer.
Background
In the continuous casting production process, the physical and chemical properties of the crystallizer covering slag directly influence the stable continuous casting production and the quality and the yield of casting blanks, and the covering slag added into the crystallizer can fully exert five metallurgical functions only by having proper physical and chemical properties: covering and heat preservation, secondary oxidation prevention, impurity absorption, lubrication between the crystallizer and the casting blank and heat transfer between the crystallizer and the casting blank improvement. One of the most important physicochemical properties of the covering slag is the melting speed of the covering slag added into the crystallizer, which is an important index for judging the amount of liquid slag provided by the covering slag and influences the thickness of a liquid slag layer and the consumption of the molten slag. The melting speed is too high, so that the powder slag layer disappears quickly, the heat preservation effect of molten slag is influenced, liquid slag is encrusted, and slag inclusion on the surface of a casting blank can be caused; the melting speed is too slow, so that the liquid slag layer is too thin, and the steel leakage accident is easily caused. Whether the melting speed of the covering slag is proper or not directly influences the thickness of a liquid slag layer and the uniformity of the growth of a casting blank shell or not, and the reasonable melting speed can fully exert various metallurgical functions of the covering slag.
The currently widely adopted test method is as follows: crucible test method, molten drop test method, slag column test method, etc. The methods have certain limitations in practical application, the measurement results are often greatly different due to different test methods, and by analyzing the characteristics and the limitations of various existing melting speed test methods, it is necessary to develop and research a melting speed measurement method capable of reflecting the actual melting condition of the mold flux.
The slag column testing method is characterized in that the shape of the sample is standard, the phenomenon is visual, the consumed time is short, the operation is simple and convenient, but in the process of testing the sample, the weight of a standard sample is different due to different operations, a sample gasket is a plane, the melting shape of the protective slag reaching the testing end point is difficult to judge, the subjective operation factor influence is large, the testing error is large, and the reproducibility is low.
The patent document No. 201310017290.6 entitled method for measuring melting speed of continuous casting mold flux uses the fact that mold flux in a crucible is completely melted as recording end time, the melted mold flux is cooled and separated, and the melting speed is calculated according to the formula VR MR.104/(t.A) (10-3 kg/s.m 2). The method has the defects that ① is troublesome to operate by separating the melted part from the cooled mold flux, ② is used for separating the condensed glass flux by screening, the glass flux is easy to be mixed with unmelted mold flux in the condensation and separation process, the unmelted mold flux is easy to be mixed with glass flux with small granularity and is easy to generate larger errors, ③ is not good in test reproducibility because the mold flux in the crucible is completely melted as recording end time, subjective human errors exist, and the influence caused by the errors cannot be overcome through a plurality of tests.
Patent document No. 200410018064.0 entitled method for measuring melting rate of mold flux reflects melting rate of mold flux by measuring burning loss of free carbon in the mold flux, samples balance data by a computer, and many laboratories have not achieved such test conditions, and the method also needs to purchase instruments to perform the measurement.
Disclosure of Invention
The technical problem solved by the invention is to provide a method for judging the melting speed of the mold flux of the crystallizer, which can accurately judge the melting speed of the mold flux added on the steel liquid level of the crystallizer, the test temperature is closer to the actual production, the judgment phenomenon is visual, and the repeatability is obviously improved.
The technical scheme is as follows:
a method of determining a melting speed of mold flux, comprising:
grinding the casting powder slag sample, and blending with dextrin to prepare a triangular conical standard sample;
using a rectangular high-temperature ceramic gasket, wherein the high-temperature ceramic gasket is provided with a triangular prism groove, the bottom area of the triangular prism groove is the same as that of a triangular conical standard sample, placing the triangular conical standard sample in the triangular prism groove, and drying the high-temperature ceramic gasket and the triangular conical standard sample;
and (3) putting the high-temperature ceramic gasket and the triangular conical standard sample into an ash melting point tester, measuring the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by using the ash melting point tester, and judging the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by analyzing the time corresponding to the shape change characteristics of the sample in the heating process.
Further: quickly putting the baked high-temperature ceramic gasket and the triangular conical standard sample on a constant temperature belt in a furnace, starting timing, and observing the time required by the standard sample to be completely melted under the condition of constant temperature; and observing the shape change characteristics of the sample, and obtaining the melting speed of the mold flux sample according to the used time after timing when the standard sample is completely melted and collapsed and flows normally.
Further: heating the ash melting point tester, and keeping the temperature for 5 minutes when the temperature is raised to 1350 ℃;
further: and observing the shape change characteristics of the sample, taking the complete melting flow of the mold powder into the groove as a determination end point, and when the triangular conical standard sample is completely melted, collapses and flows into the triangular column groove and the liquid level is level with the plane of the high-temperature gasket, finishing timing, wherein the used time is the melting speed of the mold powder of the crystallizer.
Further: and (4) repeatedly melting, taking an average value, and obtaining the melting speed of the casting powder slag sample.
Further: taking 0.5 g of the mold powder of the crystallizer, blending with dextrin liquid, mixing the dextrin in the dextrin liquid: water 3: 1, using a special sample preparation device to prepare a triangular conical standard sample.
Further: the height of the triangular prism groove is 2mm, and the high-temperature porcelain gasket and the triangular cone-shaped standard sample are put into a drying oven with the temperature of 200 ℃ for drying for 2 hours.
Compared with the prior art, the invention has the technical effects that:
in the invention, because the standard sample is in a triangular conical shape, the high-temperature gasket with the groove is used, the melting leveling shape is more visual at high temperature, and simultaneously, the concept of quantitative protection slag is introduced, the test temperature is closer to the actual production, the constant-temperature bandwidth is wide, the temperature drop is small, the influence factors of small sample, low furnace temperature, quick temperature drop, poor judgment of the shape after melting and unstable weight of the standard sample in the conventional test method are overcome, the judgment phenomenon is visual, the repeatability is obviously improved, the melting speed of the protection slag can be directly and accurately tested without calculation, the crystallizer is quicker, simpler and more convenient to operate, the reliability of the judgment result is higher, the rectangular high-temperature ceramic gasket with the groove can be repeatedly used, the detection material is saved, and the cost is reduced.
In the continuous casting production process, the crystallizer covering slag is an indispensable auxiliary material, the performance of the crystallizer covering slag directly influences the continuous casting production smoothness and the surface quality of a casting blank.
In the continuous casting process, the melting speed of the crystallizer covering slag can be accurately and comprehensively judged through the implementation comparison analysis of the method, so that whether the crystallizer covering slag is suitable for being used in continuous casting production or not is judged, the surface defects of casting blanks and the bonding breakout accidents caused by the fact that the melting performance of the crystallizer covering slag is not proper are avoided, and the method has great economic benefit.
Detailed Description
The technical solution of the present invention will be described in detail with reference to exemplary embodiments. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
In the continuous casting production process, the crystallizer covering slag is an indispensable auxiliary material, and the accurate judgment of the melting speed of the crystallizer covering slag is an important measure for improving the quality of a casting blank by stable casting.
The method for judging the melting speed of the mold flux comprises the following specific steps:
step 1: grinding the casting powder slag sample, and blending with dextrin to prepare a triangular conical standard sample;
taking 0.5 g of the mold powder of the crystallizer, blending the mold powder with dextrin liquid (dextrin: water: 3: 1), and preparing a triangular conical standard sample by using a special sample preparation device.
Step 2: using a rectangular high-temperature ceramic gasket, wherein the high-temperature ceramic gasket is provided with a triangular prism groove, the bottom area of the triangular prism groove is the same as that of a triangular conical standard sample, placing the triangular conical standard sample in the triangular prism groove, and drying the high-temperature ceramic gasket and the triangular conical standard sample;
the height of the triangular prism groove is 2mm, the triangular pyramid sample is placed in the triangular prism groove on the gasket, and the triangular pyramid sample and the triangular prism groove are placed in an oven with the temperature of 200 ℃ together for drying for 2 hours.
And step 3: and (3) putting the high-temperature ceramic gasket and the triangular conical standard sample into an ash melting point tester, measuring the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by using the ash melting point tester, and judging the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by analyzing the time corresponding to the shape change characteristics of the sample in the heating process.
Step 31: heating the ash melting point tester, and keeping the temperature for 5 minutes when the temperature is raised to 1350 ℃;
step 32: quickly putting the baked high-temperature ceramic gasket and the triangular conical standard sample on a constant temperature belt in a furnace, starting timing, and observing the time required by the standard sample to be completely melted under the condition of constant temperature;
step 33: and observing the shape change characteristics of the sample, and obtaining the melting speed of the mold flux sample according to the used time after timing when the standard sample is completely melted and collapsed and flows normally.
And observing the shape change characteristics of the sample, taking the completely melted protective slag flowing into the groove as a determination end point, and determining the melting speed of the mold protective slag by finishing timing when the triangular conical standard sample is completely melted, collapsed and flowed into the triangular column groove and the liquid level is level with the plane of the high-temperature gasket, wherein the time is the melting speed of the mold protective slag in seconds S.
And 4, step 4: repeating the step 3 times, and taking an average value to obtain the melting speed of the casting powder slag sample at 1350 ℃.
Example 1
Taking a mold flux slag sample A, wherein the chemical composition and the physical properties of the mold flux slag sample A are as follows:
the mold flux sample A is subjected to the specific measurement steps, the melting speeds of three samples are measured, the average value of each group is calculated, and the melting speed is shown in the following table 2:
| sample number | Melting time (seconds) |
| 1 | 119 |
| 2 | 118 |
| 3 | 117 |
| Average | 118 |
Example 2
Taking a mold flux slag sample B, wherein the chemical composition and the physical properties of the mold flux slag sample B are as follows 3:
the mold flux slag sample B is subjected to the specific measurement steps, the melting speeds of three samples are measured, the average value of each group is calculated, and the melting speed is shown in the following table 4:
example 3
Taking a mold flux slag sample C, wherein the chemical composition and the physical properties of the mold flux slag sample C are as follows 5:
the mold flux slag sample C is subjected to the specific measurement steps, the melting speeds of three samples are measured, the average value of each group is calculated, and the melting speed is shown in the following table 6:
| sample number | Melting time (seconds) |
| 1 | 72 |
| 2 | 71 |
| 3 | 70 |
| Average | 71 |
The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (3)
1. A method of determining a melting speed of mold flux, comprising:
grinding the mold flux slag sample, taking 0.5 g of mold flux of a crystallizer, blending with dextrin liquid, and adding dextrin into the dextrin: water 3: 1, using a special sample preparation device to prepare a triangular conical standard sample;
using a rectangular high-temperature ceramic gasket, wherein the high-temperature ceramic gasket is provided with a triangular prism groove, the bottom area of the triangular prism groove is the same as that of a triangular conical standard sample, placing the triangular conical standard sample in the triangular prism groove, and drying the high-temperature ceramic gasket and the triangular conical standard sample;
heating the ash melting point tester, and keeping the temperature for 5 minutes when the temperature is raised to 1350 ℃; putting the dried high-temperature ceramic gasket and the triangular conical standard sample on a constant temperature belt of an ash melting point tester, measuring the melting speed of the high-temperature ceramic gasket and the triangular conical standard sample by using the ash melting point tester, starting timing, observing the time required by the standard sample to be completely melted under the condition of constant temperature, observing the shape change characteristics of a sample, taking the protective slag to be completely melted and flow into the groove as a determination end point, and finishing timing when the triangular conical standard sample is completely melted and collapsed and flows into the triangular column groove and the liquid level is level with the plane of the high-temperature ceramic gasket, wherein the time is the melting speed of the protective slag of the crystallizer; when the standard sample is completely melted and collapsed and flows normally, timing is finished; and determining the melting speed by analyzing the time corresponding to the shape change characteristics of the sample in the heating process.
2. The method of determining the melting speed of mold flux according to claim 1, wherein: and repeatedly melting, and taking an average value to obtain the melting speed of the casting powder slag sample.
3. The method of determining the melting speed of mold flux according to claim 1, wherein: the height of the triangular prism groove is 2mm, and the high-temperature porcelain gasket and the triangular cone-shaped standard sample are put into a drying oven with the temperature of 200 ℃ for drying for 2 hours.
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| CN201710396245.4A CN107356624B (en) | 2017-05-27 | 2017-05-27 | Method for judging melting speed of crystallizer covering slag |
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| CN201710396245.4A CN107356624B (en) | 2017-05-27 | 2017-05-27 | Method for judging melting speed of crystallizer covering slag |
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| CN107356624B true CN107356624B (en) | 2020-06-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346159A (en) * | 2011-09-10 | 2012-02-08 | 内蒙古包钢钢联股份有限公司 | Method for testing melting speed of continuous casting powder |
| CN102721718A (en) * | 2012-06-11 | 2012-10-10 | 内蒙古包钢钢联股份有限公司 | Method for judging heat transfer property of liquid-state protecting slag in crystallizer |
| CN103063537A (en) * | 2013-01-17 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Method for measuring melting speed of continuous casting covering slag |
| CN103792251A (en) * | 2013-10-19 | 2014-05-14 | 河南通宇冶材集团有限公司 | Method for measuring melting rate of covering slag |
| CN204214800U (en) * | 2014-07-11 | 2015-03-18 | 西峡县新越冶金材料开发有限公司 | A kind of covering slag burn-off rate proving installation |
-
2017
- 2017-05-27 CN CN201710396245.4A patent/CN107356624B/en not_active Withdrawn - After Issue
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346159A (en) * | 2011-09-10 | 2012-02-08 | 内蒙古包钢钢联股份有限公司 | Method for testing melting speed of continuous casting powder |
| CN102721718A (en) * | 2012-06-11 | 2012-10-10 | 内蒙古包钢钢联股份有限公司 | Method for judging heat transfer property of liquid-state protecting slag in crystallizer |
| CN103063537A (en) * | 2013-01-17 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Method for measuring melting speed of continuous casting covering slag |
| CN103792251A (en) * | 2013-10-19 | 2014-05-14 | 河南通宇冶材集团有限公司 | Method for measuring melting rate of covering slag |
| CN204214800U (en) * | 2014-07-11 | 2015-03-18 | 西峡县新越冶金材料开发有限公司 | A kind of covering slag burn-off rate proving installation |
Non-Patent Citations (1)
| Title |
|---|
| 结晶器保护渣熔化速度测定方法的研究;智建国等;《耐火材料》;20030430;第37卷(第2期);第100-102页 * |
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