CN103308547A - Method for judging dissolving property of crystallizer casting slag to rare earth oxide - Google Patents
Method for judging dissolving property of crystallizer casting slag to rare earth oxide Download PDFInfo
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- CN103308547A CN103308547A CN2013102011400A CN201310201140A CN103308547A CN 103308547 A CN103308547 A CN 103308547A CN 2013102011400 A CN2013102011400 A CN 2013102011400A CN 201310201140 A CN201310201140 A CN 201310201140A CN 103308547 A CN103308547 A CN 103308547A
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Abstract
The invention relates to a method for judging a dissolving property of crystallizer casting slag to a rare earth oxide. The method is characterized by comprising the following steps of: adding the rare earth oxide to the crystallizer covering slag according to an addition ratio of 0.5-26% by weight; mixing and grinding to obtain a mixture with granularity of 200 meshes; blending the mixture with alcohol; preparing a standard sample with a diameter phi of 3mm*3mm by a special sample preparing device; detecting the melting property of the standard sample by a high-temperature physical property tester; judging the dissolving property of the standard sample by means of analyzing the melting process of the standard sample and the sample characteristics after melting; observing the whole process from a softening point to a flowing point of the standard sample along with the rising of temperature; and analyzing the shape characteristic of the melted sample which is cooled down. The method has the advantages that the concept of the shape characteristic of molten slag is introduced, and the dissolving property of the crystallizer covering slag to the rare earth oxide can be accurately judged by detection and analysis on the melting property with the combination of the shape characteristic; the method has the advantages of completeness and high reliability.
Description
Technical field
The present invention relates to a kind ofly judge that crystallizer protecting residue to the method for rare earth oxide solubility property, belongs to the tendency of mould powder technology for CC field.
Background technology
In continuous casting production process; the physicochemical property of crystallizer protecting residue directly affects the steady production of continuous casting and the Quality and yield of strand, joins covering slag in the crystallizer and must have suitable physicochemical property and just can give full play to its five large metallurgical function: covering and heat insulating, prevent secondary oxidation, absorb inclusion, lubricate between crystallizer and strand and improve crystallizer and strand between heat transfer.The good performance of these functions realizes by means of the good physicochemical property of molten mold flux.
In the rare earth steel production run, must there be the part rare earth to generate rare earth oxide and enters in the slag, because the fusing point of rare earth oxide is very high (such as La
2O
32320 ℃ of fusing points), can not in liquid slag, melt voluntarily, can only be dissolved gradually by melt cinder.Therefore, covering slag just directly has influence on physicochemical property and the usability of covering slag to the dissolving power of rare earth oxide, also just has influence on surface quality and the output of strand.Covering slag dissolving rare earth oxide has three kinds of situations: (1) is not good and rare earth oxide reacts, and can not dissolve too much rare earth oxide, causes rare earth oxide to sink, and might pollute molten steel, and the covering slag result of use is produced harmful effect; (2) covering slag can react with rare earth oxide preferably, and can dissolve the silicate that contains rare earth, does not affect the normal use of covering slag; (3) can be very fast and the rare earth oxide reaction, and can dissolve a large amount of silicate that contains rare earth, slag is entirely glassy state in use, on the result of use of covering slag without impact.
In the continuous casting rare earth steel is produced; if can correctly and comprehensively judge crystallizer protecting residue to the solubility property of rare earth oxide, just can reduce or stop the generation that stops the accident of watering and raising slab quality and the output that change and cause owing to the covering slag physicochemical property.Judge that at present crystallizer protecting residue yet there are no report at home and abroad to the method for rare earth oxide dissolving power.
Summary of the invention
The objective of the invention is in order more fully to judge crystallizer protecting residue to the solubility property of rare earth oxide, provide a kind of and judge that crystallizer protecting residue is to the method for rare earth oxide solubility property.Method of the present invention can judge accurately that crystallizer protecting residue to the solubility property of rare earth oxide, has great directive function to produced on-site.
Method provided by the invention is as follows:
Get crystallizer protecting residue, allocate rare earth oxide into, the allocation ratio of rare earth oxide is by weight percentage between 0.5%～26%, mixed grinding makes its granularity reach 200 orders, be in harmonious proportion with alcohol, use special-purpose sample preparation device, be made into Ф 3mm * 3mm standard specimen, utilizing the high temperature property tester that it is carried out meltdown property detects, judge its solubility property by analyzing its fusion process and melting complete sample characteristics, rising with temperature, observe the whole process of standard specimen from the softening point to the pour point, if the whole fusion process from the softening point to the pour point is steady, temperature of fusion is compared fluctuation with former slag little, for round uniformly, judge that then crystallizer protecting residue is fine to the dissolving power of rare earth oxide after the molten complete standard specimen cooling; If behind softening point expansion is arranged slightly, afterwards fusing is even, and temperature of fusion is compared with former slag and increased, and is even fractional melting type after the molten complete standard specimen cooling, judges that then crystallizer protecting residue is better to the dissolving power of rare earth oxide; If there is the expansion fluctuations in the whole fusion process from the softening point to the pour point always; melting region is longer; temperature of fusion significantly improves, and molten finish after the standard specimen cooling as inhomogeneous fractional melting and has no cofusing particle, judges that then crystallizer protecting residue is bad to the dissolving power of rare earth oxide.
Advantage of the present invention is: the concept of having introduced the slag shape facility in the method; detection analysis by meltdown property; and in conjunction with its shape facility, more can accurately judge crystallizer protecting residue to the rare earth oxide solubility property, have advantages of comprehensively, reliability is high.
Description of drawings
Fig. 1 is sample change of shape process in the former slag temperature-rise period;
Fig. 2 is the molten rear sample photo of cooling of finishing of former slag;
Fig. 3 is the molten rear sample photo of cooling of finishing of slag that covering slag has fine solubility property among the present invention to rare earth oxide;
Fig. 4 is the molten rear sample photo of cooling of finishing of slag that covering slag has better solubility property among the present invention to rare earth oxide;
Fig. 5 is when covering slag is bad to the rare earth oxide solubility property among the present invention, fusion process specimen shape change procedure;
Fig. 6 is that covering slag cools off rear sample photo to molten the finishing of the bad slag of rare earth oxide solubility property among the present invention.
Embodiment
1) get the slag sample, allocate rare earth oxide into, the allocation ratio of rare earth oxide between 0.5%～26%, grinds by weight percentage, and powder size reaches 200 orders after grinding, and is in harmonious proportion with anhydrous alcohol, makes the standard specimen of Ф 3mm * 3mm with special-purpose sample preparation device;
2) made standard specimen is put into baking oven, temperature is set to 200 ℃, keeps 2 hours;
3) the high temperature property tester at the uniform velocity heats up, and when temperature is raised to 500 ℃, the sample that baking is good is put into.
4) with the rising of temperature, observe the sample fusion process, the molten rear shape facility of sample cooling of finishing is analyzed.
Take generous slab production crystallizer protecting residue as example, covering slag is divided into 16 parts, keep 1 part of former slag, in all the other 15 parts of covering slags, allocate the rare earth oxide of different proportion into, concrete allocation ratio sees Table 1, and it is carried out the detection of meltdown property.Fig. 1 is former slag fusion process.Fig. 2 is the molten rear sample of cooling of finishing of former slag, finds out from figure, and shape is even.Table 1 finds out from table for allocating the covering slag temperature of fusion of different proportion rare earth oxide into, when rare earth oxide content 5% when following; its fusion process is compared with former slag and is changed not quite, and the temperature of fusion fluctuation is little, and the molten cooling samples that finishes is seen Fig. 3; as seen from the figure, the sample fusing evenly.When rare earth oxide content 25% when following, temperature of fusion slightly is improved, the molten cooling samples that finishes is seen Fig. 4, though sub-melting phenomenon is arranged, all fusings and evenly illustrate that covering slag is better to the solubility property of rare earth oxide.When rare earth oxide content 25% when above, it is larger that its fusion process and former slag are compared variation, after softening point, expand rises and falls always, sees Fig. 5, temperature of fusion significantly improves; Fig. 6 is the molten cooling samples that finishes, and as seen from the figure, sample has obvious sub-melting phenomenon and no cofusing particle, illustrates that covering slag is bad to the solubility property of rare earth oxide.Judge that by this inventive method this slag is stronger to the dissolving power of rare earth oxide, can reach about 25%, satisfy existing rare earth steel production.In actual production was used, the physicochemical property of covering slag changed little, and its usability is good, can guarantee continuous casting direct motion and slab quality.
Table 1 is allocated the covering slag temperature of fusion of different proportion rare earth oxide by weight percentage into
Claims (1)
1. judge that crystallizer protecting residue is to the method for rare earth oxide solubility property for one kind, it is characterized in that: get crystallizer protecting residue, allocate rare earth oxide into, the allocation ratio of rare earth oxide is by weight percentage between 0.5%～26%, mixed grinding makes its granularity reach 200 orders, be in harmonious proportion with alcohol, use special-purpose sample preparation device, be made into Ф 3mm * 3mm standard specimen, utilizing the high temperature property tester that it is carried out meltdown property detects, judge its solubility property by analyzing its fusion process and melting complete sample characteristics, with the rising of temperature, observe the whole process of standard specimen from the softening point to the pour point, if the whole fusion process from the softening point to the pour point is steady, temperature of fusion is compared fluctuation with former slag little, for round uniformly, judges that then crystallizer protecting residue is fine to the dissolving power of rare earth oxide after the molten complete standard specimen cooling; If behind softening point expansion is arranged slightly, afterwards fusing is even, and temperature of fusion is compared with former slag and increased, and is even fractional melting type after the molten complete standard specimen cooling, judges that then crystallizer protecting residue is better to the dissolving power of rare earth oxide; If there is the expansion fluctuations in the whole fusion process from the softening point to the pour point always; melting region is longer; temperature of fusion significantly improves, and molten finish after the standard specimen cooling as inhomogeneous fractional melting and has no cofusing particle, judges that then crystallizer protecting residue is bad to the dissolving power of rare earth oxide.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550797A (en) * | 2015-01-13 | 2015-04-29 | 东北大学 | Hyporeactive crystallizer casting powder for rear earth steel continuous casting |
| CN104597071A (en) * | 2015-02-10 | 2015-05-06 | 攀枝花学院 | Measurement method for relative softening temperature of carbon-sulphur crucible |
| CN113358679A (en) * | 2021-05-21 | 2021-09-07 | 包头钢铁（集团）有限责任公司 | Method for judging influence of rare earth steel on crystallizer protection slag phase |
| CN114460124A (en) * | 2022-01-24 | 2022-05-10 | 包头钢铁（集团）有限责任公司 | Method for judging influence of rare earth content in casting molten steel on melting temperature of crystallizer casting powder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002296206A (en) * | 2001-04-02 | 2002-10-09 | Japan Nuclear Cycle Development Inst States Of Projects | Method of measuring melting point of high melting point material |
| 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 |
-
2013
- 2013-05-27 CN CN2013102011400A patent/CN103308547A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002296206A (en) * | 2001-04-02 | 2002-10-09 | Japan Nuclear Cycle Development Inst States Of Projects | Method of measuring melting point of high melting point material |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| LI GUI-RONG ET AL.: ""Physical Properties and Regulating Mechanism of Fluoride-Free and Harmless B2O3-Containing Mould Flux"", 《JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL》 * |
| 王德永 等: ""稀土氧化物对结晶器保护渣理化性质的影响"", 《东北大学学报(自然科学版)》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550797A (en) * | 2015-01-13 | 2015-04-29 | 东北大学 | Hyporeactive crystallizer casting powder for rear earth steel continuous casting |
| CN104550797B (en) * | 2015-01-13 | 2016-08-31 | 东北大学 | A kind of hypoergia crystallizer protecting residue of rare earth steel continuous casting |
| CN104597071A (en) * | 2015-02-10 | 2015-05-06 | 攀枝花学院 | Measurement method for relative softening temperature of carbon-sulphur crucible |
| CN104597071B (en) * | 2015-02-10 | 2017-07-28 | 攀枝花学院 | Assay method of the carbon-sulfur crucible with respect to softening temperature |
| CN113358679A (en) * | 2021-05-21 | 2021-09-07 | 包头钢铁（集团）有限责任公司 | Method for judging influence of rare earth steel on crystallizer protection slag phase |
| CN114460124A (en) * | 2022-01-24 | 2022-05-10 | 包头钢铁（集团）有限责任公司 | Method for judging influence of rare earth content in casting molten steel on melting temperature of crystallizer casting powder |
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Application publication date: 20130918 |