High-efficiency stirring method and device for non-gas-entrapment iron-aluminum oxide melt
A stirring method and alumina technology, which are applied in stirring devices, chemical instruments and methods, transportation and packaging, etc., can solve the problems of entrainment and low stirring efficiency, and achieve the effect of solving the technical problems of entrainment and low stirring efficiency.
Inactive Publication Date: 2018-06-22
BEIJING JIAOTONG UNIV
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Problems solved by technology
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Embodiment approach 1
[0030] Embodiment 1, under the condition that the power of the high-speed electromagnetic stirring device is 20kW, the rotating speed is 900 rpm, a is 0mm, b is 0mm, c is 0mm, and d is 5mm, after stirring stably for 1 minute and 50 seconds, you can get Iron-alumina melt with no air entrainment and uniform distribution of alumina particles6.
Embodiment approach 2
[0031] Embodiment 2, under the condition that the power of the high-speed electromagnetic stirring device is 20kW, the rotating speed is 1200 r / min, a is 20mm, b is 20mm, c is 10mm, and d is 10mm, after 2 minutes of stable stirring, no coil can be obtained Iron-alumina melt with uniform distribution of gas and alumina particles6.
[0032] It can be seen that under the premise of using variable-volume graphite crucible to evacuate and isolate the contact between gas and melt, and then under the condition of high-power and high-speed electromagnetic stirring, the method of the present invention can efficiently prepare gas-free and uniformly distributed alumina particles. Iron-alumina melt.
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Abstract
The invention discloses a high-efficiency stirring method and device for non-gas-entrapment iron-aluminum oxide melt, and belongs to material processing and research fields of metallurgy, casting andthe like. A volume-variable graphite crucible of which the inner wall is distributed with straight blades is combined with high-speed electromagnetic stirring so as to stir iron-aluminum oxide melt; the volume-variable graphite crucible is utilized for emptying all gas at the upper part of the melt in the graphite crucible by reducing the volume of the graphite crucible, and under the condition that the melt is completely isolated from the external gas, namely that no gas source is provided, stirring of the melt is performed so as to fundamentally avoid the gas entrapment of the melt; the high-speed electromagnetic stirring is utilized for enabling the iron-aluminum oxide melt to generate circumferential high-speed stirring motion under the condition of no gas entrapment constraint; and the straight blades on the inner wall of the graphite crucible are utilized for continuously moving internal iron-aluminum oxide melt to the periphery and moving the iron-aluminum oxide melt at the upper part to the lower part so as to prevent upward floating and central segregation motion of aluminum oxide granules, thereby obtaining non-gas-entrapment iron-aluminum oxide melt with uniformly distributed aluminum oxide granules. The stirring time can be shortened to two minutes, and the technical problems of gas entrapment and low stirring efficiency existing in the stirring process of the iron-aluminum oxide melt are solved.
Description
technical field [0001] The invention belongs to the research field of metallurgy, casting and other material processing, and in particular relates to a high-efficiency stirring method and device for an air-free iron-alumina melt. Background technique [0002] In metallurgy, casting and other material processing research fields, it is often necessary to stir various melts, such as metal semi-solid slurry, stirring of particle melts, etc., in order to make the temperature, composition, structure, etc. of the melt uniform change. Stirring efficiency usually depends on the stirring intensity. The greater the stirring intensity, the stronger the shear and turbulence formed, the shorter the stirring time for the melt to achieve homogenization of temperature, composition, structure, etc., and the higher the stirring efficiency. However, strong stirring will lead to the problem of entrained air in the melt, which can easily cause oxidation of the high-temperature melt and the forma...
Claims
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IPC IPC(8): B01F13/08F27D27/00C22C33/04
CPCF27D27/00C22C33/04B01F33/451B01F2101/26
Inventor 杜云慧张伟一张鹏王玉洁
Owner BEIJING JIAOTONG UNIV