CN103572065A - Aluminum alloy dehydrogenation method - Google Patents
Aluminum alloy dehydrogenation method Download PDFInfo
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- CN103572065A CN103572065A CN201310517476.8A CN201310517476A CN103572065A CN 103572065 A CN103572065 A CN 103572065A CN 201310517476 A CN201310517476 A CN 201310517476A CN 103572065 A CN103572065 A CN 103572065A
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Abstract
The invention relates to an aluminum alloy dehydrogenation method. In a degasification box, inert gas is blew to an aluminum alloy melt from the upper part by a rotary blowing mode, simultaneously the inert gas is blew to the melt from the bottom of the degasification box by air bricks installed at the bottom of the degasification box; the inert gas in the upper part of the degasification box is nitrogen; the inert gas at the bottom of the degasification box is mixed gas of nitrogen and helium. The aluminum alloy dehydrogenation method disclosed by the invention has a good dehydrogenation effect, uses little gas for dehydrogenation, and is suitable for aluminum alloy with different marks.
Description
Technical field
The invention belongs to aluminium alloy refining field, specifically a kind of method of removing Dissolved H in Liquid Al-Si Alloy gas.
Background technology
Gas sweetening in aluminium alloy refining process is the gordian technique that guarantees aluminum alloy materials quality, and the hydrogen richness reducing in aluminum alloy melt is one of main order ground of cleaning aluminium alloy.In aluminum alloy melt, dehydrogenation purification techniques can be divided into adsorption cleaning and the large class of non-adsorption cleaning two by action principle, adsorption cleaning by adding sorbent material in aluminum alloy melt, make in process that sorbent material contacts with aluminum alloy melt, there is effect chemistry, physics or machinery with aluminium alloy, thereby reach the object of dehydrogenation.But not adsorption cleaning be by some physical action as vacuum, ultrasonic wave etc., change aluminum alloy melt-gas equilibrium state, thereby reach the object that gas is separated from aluminum alloy melt.
Utilize gas refinement agent, when air blast carries out adsorption cleaning dehydrogenation to aluminum alloy melt, owing to improving the efficiency of dehydrogenation by improving the dynamic conditions of dehydrogenation, therefore easy to operate and pollution is lacked.Current existing air blast is to grow up 20th century 70, the eighties mostly, according to the introduction method of gas, can be divided into single pipe method, porous blow head method, stationary nozzle method and rotating and puffing argon method.
The state of the art of the dehydrogenation treating plant of various countries can drop to 0.1-0.09ml/100gAl left and right by 0.2-0.4ml/100gAl before processing mostly at present, improvement along with degassing effect, gas consumption significantly rises, as degassing effect is compared good SNIF and ALPURUR technology, the rare gas element that every kg aluminium alloy consumes, metal gas consumption ratio has reached 0.67-0.84L/kg.Therefore the cost of degasification is higher, and owing to mostly adopting the method for rotary blowing, not only makes liquid fluctuating serious, causes oxidation to increase, and is unfavorable for realizing the even degasification of integral body of inside, molten bath simultaneously.
On the other hand, the rare gas element of the existing removal hydrogen using is to take nitrogen as main, and nitrogen is when carrying out dehydrogenation, can form aluminium nitride with aluminium, affects the quality of product.
Summary of the invention
The present invention is directed to above-mentioned deficiency of the prior art, a kind of method of aluminium alloy liquid purification is provided, when making its gas in reaching efficient removal aluminum alloy melt, reduces gas usage, and reduce the problem of oxidation that liquid fluctuating brings, and can effectively suppress the formation of aluminium nitride.
The present invention is achieved by the following technical solutions:
A dehydrogenating process adopts the mode of rotary blowing that rare gas element is blown into aluminium alloy melt in degasification tank from top, the gas permeable brick of simultaneously installing by the bottom of degasification tank is blown into melt by rare gas element from the bottom of degasification tank; The rare gas element on described degasification tank top is nitrogen; The rare gas element of described degasification tank bottom is the mixed gas of nitrogen and helium, and wherein, the volume ratio of helium and nitrogen is 1:20.
Degasification tank top rotary blowing rare gas element, gaseous tension is 0.1-0.15MPa, flow is 0.2-0.3m3/h.
Degasification tank bottom winding-up rare gas element, gaseous tension is 0.1-0.05MPa, flow is 0.03-0.05m3/h.
The invention has the beneficial effects as follows, be that the melt of simultaneously having realized each position in whole molten bath all can realize the object of dehydrogenation evenly, efficiently because of top and bottom complex blowing; The hydrogen that removes due to the introducing of bottom gas permeable brick, has significantly reduced top gas inlet, has reduced the liquid fluctuating causing thus, thereby has been conducive to avoid the increase that in aluminum alloy melt, nitrogen reacts with aluminum oxidation; Owing to evenly jetting in the end, top, gas utilising efficiency is increased simultaneously, thereby reduced the total flow of gas.
Embodiment
By specific embodiment, describe technical scheme of the present invention in detail below.
Adopt the inventive method on aluminium sheet casting and rolling the production line, to carry out actual tests.In standing furnace, aluminium liquid service temperature is 800 ℃ of left and right, and in degasification tank, aluminium liquid is 750 ℃ of left and right, aluminium liquid liquid level 500mm, processing aluminum alloy melt 750kg per hour.
A dehydrogenating process adopts the mode of rotary blowing that rare gas element is blown into aluminium alloy melt in degasification tank from top, the gas permeable brick of simultaneously installing by the bottom of degasification tank is blown into melt by rare gas element from the bottom of degasification tank; The rare gas element on described degasification tank top is nitrogen; The rare gas element of described degasification tank bottom is the mixed gas of nitrogen and helium, and wherein, the volume ratio of helium and nitrogen is 1:20.
Degasification tank top rotary blowing rare gas element, gaseous tension is 0.1-0.15MPa, flow is 0.2-0.3m3/h.
Degasification tank bottom winding-up rare gas element, gaseous tension is 0.1-0.05MPa, flow is 0.03-0.05m3/h.
Embodiment 1
In degasification tank from top rotary blowing: 200 revs/min of rotary blowing rotor rotating speeds, gases used N2, flow 0.2m3/h, gaseous tension 0.1MPa,
From the bottom of degasification tank, be blown into aluminum alloy melt: the gases used nitrogen of gas permeable brick and helium mix gas, gaseous tension is 0.1MPa, flow is 0.03m3/h, hydrogen richness 0.10ml/100gAl in aluminum alloy melt after purifying, metal gas consumption ratio is 0.31L/kg.
Embodiment 2
In degasification tank from top rotary blowing: 200 revs/min of rotary blowing rotor rotating speeds, gases used nitrogen, flow is 0.2m3/h, gaseous tension 0.15MPa,
From the bottom of degasification tank, be blown into aluminum alloy melt, the gases used nitrogen of gas permeable brick and helium mix gas, gaseous tension is 0.1MPa, flow is 0.03m3/h, hydrogen richness 0.12ml/100gAl in aluminum alloy melt after purifying, metal gas consumption ratio is 0.31L/kg.
Embodiment 3
In degasification tank from top rotary blowing: 200 revs/min of rotary blowing rotor rotating speeds, gases used nitrogen, flow is 0.3m3/h, gaseous tension 0.1MPa
From the bottom of degasification tank, be blown into aluminum alloy melt: the gases used nitrogen of gas permeable brick and helium mix gas, gaseous tension is 0.05MPa, flow is 0.05m3/h, hydrogen richness 0.09ml/100gAl in aluminum alloy melt after purifying, metal gas consumption ratio is 0.46L/kg.
Claims (3)
1. an aluminium alloy dehydrogenating process, it is characterized in that: in degasification tank, from top, adopt the mode of rotary blowing that rare gas element is blown into aluminium alloy melt, the gas permeable brick of simultaneously installing by the bottom of degasification tank is blown into melt by rare gas element from the bottom of degasification tank; The rare gas element on described degasification tank top is nitrogen; The rare gas element of described degasification tank bottom is the mixed gas of nitrogen and helium, and wherein, the volume ratio of helium and nitrogen is 1:20.
2. aluminium alloy dehydrogenating process according to claim 1, is characterized in that: degasification tank top rotary blowing rare gas element, and gaseous tension is 0.1-0.15MPa, flow is 0.2-0.3m3/h.
3. aluminium alloy dehydrogenating process according to claim 1, is characterized in that: degasification tank bottom winding-up rare gas element, and gaseous tension is 0.1-0.05MPa, flow is 0.03-0.05m3/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310517476.8A CN103572065A (en) | 2013-10-28 | 2013-10-28 | Aluminum alloy dehydrogenation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310517476.8A CN103572065A (en) | 2013-10-28 | 2013-10-28 | Aluminum alloy dehydrogenation method |
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| CN103572065A true CN103572065A (en) | 2014-02-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107805723A (en) * | 2017-09-15 | 2018-03-16 | 广西平果铝合金精密铸件有限公司 | A kind of purifying aluminium alloy melt method |
| CN109234550A (en) * | 2018-09-13 | 2019-01-18 | 洛阳新远大冶金成套设备有限公司 | Molten metal dehydrogenation air-channel system |
| CN111318657A (en) * | 2018-12-14 | 2020-06-23 | 宁波江丰电子材料股份有限公司 | Method for manufacturing titanium target copper-chromium alloy back plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693495A (en) * | 2005-06-09 | 2005-11-09 | 上海交通大学 | Method of purifying aluminium alloy melt |
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2013
- 2013-10-28 CN CN201310517476.8A patent/CN103572065A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693495A (en) * | 2005-06-09 | 2005-11-09 | 上海交通大学 | Method of purifying aluminium alloy melt |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107805723A (en) * | 2017-09-15 | 2018-03-16 | 广西平果铝合金精密铸件有限公司 | A kind of purifying aluminium alloy melt method |
| CN109234550A (en) * | 2018-09-13 | 2019-01-18 | 洛阳新远大冶金成套设备有限公司 | Molten metal dehydrogenation air-channel system |
| CN111318657A (en) * | 2018-12-14 | 2020-06-23 | 宁波江丰电子材料股份有限公司 | Method for manufacturing titanium target copper-chromium alloy back plate |
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Application publication date: 20140212 |