CN103436655A - Method for removing and refining inclusion and bubble from molten metal - Google Patents
Method for removing and refining inclusion and bubble from molten metal Download PDFInfo
- Publication number
- CN103436655A CN103436655A CN2013101946995A CN201310194699A CN103436655A CN 103436655 A CN103436655 A CN 103436655A CN 2013101946995 A CN2013101946995 A CN 2013101946995A CN 201310194699 A CN201310194699 A CN 201310194699A CN 103436655 A CN103436655 A CN 103436655A
- Authority
- CN
- China
- Prior art keywords
- molten metal
- bubble
- inclusion
- electrode
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for removing and refining inclusion and bubble from molten metal. A method of applying a low current density current in the molten metal to treat the molten metal is employed to achieve an object of removing the inclusion and bubble from the molten metal and refining the size of residual inclusion and bubble in the molten metal. A positive electrode and a negative electrode of a treatment system consisting of the positive and negative electrodes, wires and a power supply are contacted with the molten metal respectively, so as to form a conductive circuit by the treatment system and the molten metal; the low current density current generated by the circuit power supply is used to promote the removal of the inclusion and bubble in the molten metal and refine the residual inclusion and bubble in the molten metal. The method is low in cost, simple in operations, and convenient for implementation, and can significantly remove and refine the inclusion and bubble in the molten metal, without producing interference to a control system of an operational platform and detection signals.
Description
Technical field
The present invention relates to the purifying technology of molten metal, be specifically related to removal and the thinning method of inclusion and bubble in molten metal.
Background technology
Remove inclusion and bubble in molten metal, and control it and remain in quantity, distribution and the size in steel, be improve steel product quality and performance most important, also be the most basic technique means.Particularly in recent years along with improving constantly that scientific and technical development and every profession and trade require steel product quality, to the removal of inclusion in molten metal and bubble with control and also proposed higher and stricter requirement.
At present, the removal of inclusion and bubble is mainly to utilize inclusion and the molten metal difference on density, relies on buoyancy to remove.In order to promote the floating of inclusion, many auxiliary process measures have been developed.Wherein, current widely used have Argon and induction stirring.
Although aforesaid method, for inclusion and the bubble of removing in molten metal provides some technique means and technological measure, exists obvious shortcoming and defect.Mainly contain:
(1) Argon is not obvious to the removal effect of fine foreign matter in molten metal;
(2) if the bubble that Argon produces does not float and removes in time, the bubble of staying in metal can have a negative impact to the performance of metallic substance;
(3) electromagnetic stirring equipment is more complicated, and the bubble that promotes inclusion floating can not be provided;
(4) technology such as Argon and induction stirring all can not refinement remain in inclusion and the bubble in molten metal, makes it to become the less small size of steel performance impact is mingled with and bubble.
Apply large electric current (>10 in molten metal
6a m
-2) or high frequency (>10
6hz), during pulsed current, the electromagnetic force of generation can promote inclusion migration wherein.But, all can produce interference to Controlling System and the detection signal of service platform while adopting large electric current or high-frequency pulse electric current, have a strong impact on production safety.In addition, in order to obtain large electric current and high-frequency pulse electric current, cost of equipment is high and occupied ground is large, is unfavorable for directly implementing in scale production.
Summary of the invention
In the shortcoming existed in order to overcome above method, the present invention adopts the method apply low current density current processing molten metal in molten metal, reaches and removes the purpose that inclusion and bubble and refinement in molten metal remain in foreign material and bubble size in molten metal.Cost of the present invention is low, easy and simple to handle, easy to implement, can significantly remove with the refinement molten metal in inclusion and bubble, and can not produce and disturb the Controlling System of service platform and detection signal.The present invention includes selection, the electrode arrangement mode of electrode materials, selection, current density and the action time etc. of power supply, it is characterized in that:
A: electrode materials is selected: positive electrode and negative electrode material are the magnesium carbonaceous material, perhaps alumina graphite material, perhaps zirconium carbonaceous material, perhaps carbofrax material, or boron carbide material, or carbofrax material, perhaps zirconium boride 99.5004323A8ure material, perhaps Molybdenum metal materials industry, or tungsten metallic substance, or one or two or more kinds mixture or the compound in platinum metal material forms;
B: electrode arrangement mode: an end of positive electrode and negative potential is connected with power supply by cable, an other end directly contacts or inserts in molten metal with molten metal, electrode can insert from molten metal top, perhaps be embedded in the refractory materials of the bottom that holds molten metal container or sidewall, or can be the refractory materials that holds molten metal;
C: power supply is selected: power supply is conventional DC power supply or pulse dc power, and wherein pulse dc power is square-wave pulse, pulse-repetition 0.1Hz-10
4hz;
D: current density: when energising is processed in molten metal current density be 10
-2a m
-2-10
4a m
-2;
E: action time: according to allowing the size of inclusion or bubble in molten metal after processing, the energising treatment time can be chosen as 0.5min-300min.
Effect of the present invention is as follows:
(1) remove in molten metal, be mingled with the bubble effect remarkable: by changing the sense of current and size, can control migratory direction and the travelling speed of inclusion in molten metal, and can refinement and control residual quantity, size and the distribution be mingled with bubble in molten metal;
(2) processing costs is low: because treating processes electric current used is little, do not need special device and equipment, and can repeatedly use continuously, therefore, its processing costs will be well below other current treatment processs;
(3) treating processes is simple and convenient: the process that applies of low current density electric current is simple, convenient, easily realize, treating processes can not brought any disadvantageous effect to Controlling System and the detection signal of smelting process and service platform, and technique is simple, can directly in industrial production, apply.
The accompanying drawing explanation
Do not apply the steel sample of electric current in Fig. 1 melting process.
Applied the steel sample of galvanic current in Fig. 2 melting process.
Applied the steel sample of pulsed current in Fig. 3 melting process.
Embodiment
embodiment 1
The employing free-cutting steel is objective for implementation, is heated to 1580 ℃ of fusings under argon gas atmosphere in vertical corundum tube furnace.After the rear 10min of insulation, take high pure metal platinum as electrode inserts molten steel under 1580 ℃, the molten steel sample has been carried out respectively not applying electric current and applying galvanic current (current density 1A m
-2) and pulsed current (square wave positive pulse, current density 1A m
-2, frequency 200Hz) processing, the time is 10min.After processing finishes, the steel sample cools to room temperature with the furnace.By electron microscope observation, find, the steel sample after current processing, inclusion and number of bubbles wherein obviously reduce, and size is less, it is more even to disperse.In addition, while processing with direct current, compare, the effect while utilizing pulsed current to process is more obvious.
embodiment 2
The employing free-cutting steel is objective for implementation, take the magnesium carbonaceous material as crucible, is heated to 1580 ℃ of fusings in induction furnace.After the rear 10min of insulation, take the magnesium carbonaceous material as negative pole under 1580 ℃, is that 20mm magnesium carbonaceous material rod is the anodal molten steel that inserts by diameter, and the molten steel sample has been carried out respectively not applying electric current and applying galvanic current (current density 0.5A m
-2) and pulsed current (square wave positive pulse, current density 0.5A m
-2, frequency 100Hz) processing, the time is 15min.After processing finishes, the steel sample cools to room temperature with the furnace.By electron microscope observation, find, due to the effect of induction stirring, the inclusion in the steel sample is few with the steel sample that number of bubbles is processed than tube furnace.Similar to embodiment 1, the steel sample after current processing, inclusion and number of bubbles wherein obviously reduce, and size is less, it is more even to disperse.In addition, while processing with direct current, compare, the effect while utilizing pulsed current to process is more obvious.
Claims (2)
1. removal and the thinning method of inclusion and bubble in a molten metal, comprise selection, the electrode arrangement mode of electrode materials, selection, current density and the action time etc. of power supply, it is characterized in that:
A: electrode materials is selected: positive electrode and negative electrode material are the magnesium carbonaceous material, perhaps alumina graphite material, perhaps zirconium carbonaceous material, perhaps carbofrax material, or boron carbide material, or carbofrax material, perhaps zirconium boride 99.5004323A8ure material, perhaps Molybdenum metal materials industry, or tungsten metallic substance, or one or two or more kinds mixture or the compound in platinum metal material forms;
B: electrode arrangement mode: an end of positive electrode and negative potential is connected with power supply by wire, an other end directly contacts or inserts in molten metal with molten metal, electrode can insert from molten metal top, perhaps be embedded in the refractory materials of the bottom that holds molten metal container or sidewall, or directly using hold molten metal refractory materials as electrode;
C: power supply is selected: power supply is conventional DC power supply or pulse dc power, and wherein pulse dc power is square-wave pulse, pulse-repetition 0.1Hz-10
4hz;
D: current density: when energising is processed in molten metal current density be 10
-2a m
-2-10
4a m
-2;
E: action time: according to allowing the size of inclusion or bubble in molten metal after processing, the energising treatment time can be chosen as 0.5min-300min.
2. the removal of inclusion according to claim 1 and bubble and thinning method, by apply the low current density electric current in molten metal, can remove with the refinement molten metal in inclusion and bubble, it is characterized in that adopting current density is 1A m
-2-100A m
-2, the square wave direct current pulse action that pulse-repetition is 1-500Hz is after molten metal 10-30min, and the inclusion in molten metal and bubble total amount reduce 40%-90% and inclusion and bubble size and are not more than 10 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101946995A CN103436655A (en) | 2013-05-23 | 2013-05-23 | Method for removing and refining inclusion and bubble from molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101946995A CN103436655A (en) | 2013-05-23 | 2013-05-23 | Method for removing and refining inclusion and bubble from molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103436655A true CN103436655A (en) | 2013-12-11 |
Family
ID=49690368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101946995A Pending CN103436655A (en) | 2013-05-23 | 2013-05-23 | Method for removing and refining inclusion and bubble from molten metal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103436655A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
| CN104726638A (en) * | 2015-03-12 | 2015-06-24 | 东北大学 | Method for removing impurities from liquid steel in steel ladle |
| CN104725079A (en) * | 2015-03-12 | 2015-06-24 | 东北大学 | Method for forming smooth and compact layer on surface of carbon-containing refractory material |
| CN104772452A (en) * | 2015-03-12 | 2015-07-15 | 东北大学 | Method for preventing steel billet continuous casting nozzle from blocking |
| CN105483804A (en) * | 2015-11-26 | 2016-04-13 | 上海应用技术学院 | Preparing method of boron carbide combination electrode |
| CN113718121A (en) * | 2021-08-05 | 2021-11-30 | 北京科技大学 | Method for rapidly realizing ultra-clean smelting of rare earth magnesium alloy |
| CN113755891A (en) * | 2021-08-05 | 2021-12-07 | 北京科技大学 | Method and device for realizing metal melt purification by using pulse current density gradient |
| CN113770321A (en) * | 2021-09-06 | 2021-12-10 | 信承瑞技术有限公司 | Copper water smelting upward-drawing process for controlling copper alloy inclusions |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1453371A (en) * | 2002-04-25 | 2003-11-05 | 上海大学 | Electrochemical pollution-free metal liquid deoxygenating process |
| CN102517417A (en) * | 2011-12-08 | 2012-06-27 | 辽宁科技大学 | Method for removing and controlling foreign substances in metal and alloy |
-
2013
- 2013-05-23 CN CN2013101946995A patent/CN103436655A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1453371A (en) * | 2002-04-25 | 2003-11-05 | 上海大学 | Electrochemical pollution-free metal liquid deoxygenating process |
| CN102517417A (en) * | 2011-12-08 | 2012-06-27 | 辽宁科技大学 | Method for removing and controlling foreign substances in metal and alloy |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
| CN104726638A (en) * | 2015-03-12 | 2015-06-24 | 东北大学 | Method for removing impurities from liquid steel in steel ladle |
| CN104725079A (en) * | 2015-03-12 | 2015-06-24 | 东北大学 | Method for forming smooth and compact layer on surface of carbon-containing refractory material |
| CN104772452A (en) * | 2015-03-12 | 2015-07-15 | 东北大学 | Method for preventing steel billet continuous casting nozzle from blocking |
| CN105483804A (en) * | 2015-11-26 | 2016-04-13 | 上海应用技术学院 | Preparing method of boron carbide combination electrode |
| CN113718121A (en) * | 2021-08-05 | 2021-11-30 | 北京科技大学 | Method for rapidly realizing ultra-clean smelting of rare earth magnesium alloy |
| CN113755891A (en) * | 2021-08-05 | 2021-12-07 | 北京科技大学 | Method and device for realizing metal melt purification by using pulse current density gradient |
| CN113770321A (en) * | 2021-09-06 | 2021-12-10 | 信承瑞技术有限公司 | Copper water smelting upward-drawing process for controlling copper alloy inclusions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103436655A (en) | Method for removing and refining inclusion and bubble from molten metal | |
| CN100493770C (en) | Method for conticaster controlling solidification structure of casting block | |
| US20040084323A1 (en) | Extraction of metals | |
| CN110640120B (en) | Manufacturing device and manufacturing method of stainless steel electroslag remelting steel ingot | |
| JP6798575B2 (en) | Desulfurization method of molten metal | |
| RU2010129916A (en) | DEVICE AND METHOD FOR PRODUCING METALS OR METAL COMPOUNDS | |
| CN102912081A (en) | Method for improving cleanliness of steel by treating molten steel with external electric field | |
| CN104668526B (en) | Improve the method for steel ingot ingot quality | |
| CN103993132B (en) | The method of LF stove smelting low-nitrogen steel | |
| CN105331833B (en) | The purifying plant and method of a kind of high pure rare earth metals | |
| TWI816422B (en) | Refining method of molten steel | |
| CN102994694A (en) | Method for efficiently carburetting molten steel of LF (ladle furnace) | |
| CN103072997B (en) | Method and device for removing metal impurities in polycrystalline silicon | |
| KR101370029B1 (en) | Refining equipment and process for titanium scrap using plasma hydrogen ion | |
| CN104562085A (en) | Crude lead electrolytic refining method | |
| CN102517417A (en) | Method for removing and controlling foreign substances in metal and alloy | |
| RU2631215C1 (en) | Method of producing metallic aluminium and device for its implementation | |
| CN103938064A (en) | Electroslag remelting process of high-carbon steel for producing drawing wires | |
| Mamyachenkov et al. | Research into the influence of process parameters on the efficiency of zinc electrolysis from alkaline solutions | |
| KR101821252B1 (en) | Processing apparatus of molten metal and processing method using the same | |
| JP2013199671A (en) | Method for electrolyzing high bismuth quality lead anode | |
| CN110616338A (en) | Impurity removal method for copper melt and preparation method for high-purity high-conductivity copper | |
| WO2011099110A1 (en) | Silicon vacuum melting method | |
| CN203373383U (en) | LF refining deoxidizing device capable of improving molten steel cleanliness | |
| GB676854A (en) | Method of separating solid substances or colloids from liquids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131211 |