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Continuous vacuum purification process of producing high-purity aluminium

A vacuum and continuous technology, applied in the field of vacuum continuous purification and purification of high-purity aluminum, can solve the problems of poor purification effect, reduced production efficiency, increased energy consumption, etc., to reduce the intrusion of oxygen atoms, quality The effect of maintaining stability and improving production efficiency

Inactive Publication Date: 2004-09-29
NANTONG TADE ELECTRONICS MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cumulative result of impurity elements at the interface front leads to C 0 The value of increases, when the condition is stable k E value remains constant, the solute concentration of the solid phase C E As a result, the purification effect is poor, and the content of impurity elements at the tail of the solidified aluminum ingot is high, and its removal and reprocessing remelting cause energy waste, which reduces production efficiency and increases energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: When the growth rate is 0.5 cm / h, the impurity-rich liquid with a thickness of 2 mm at the front of the interface is sucked out every 0.5 h, and the purity of the solid phase can reach 5N4 to 5N5.

Embodiment 2

[0008] Example 2: When the growth rate is 5 cm / h, the impurity-rich liquid with a thickness of 2 mm at the front of the interface is sucked out every 1 h, and the purity of the solid phase can reach 5N2 to 5N3.

Embodiment 3

[0009] Example 3: When the growth rate is 10 cm / h, the impurity-rich liquid with a thickness of 5 mm at the front of the interface is sucked out every 3 hours, and the purity of the solid phase can reach 5N to 5N2.

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PUM

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Abstract

The present invention belongs to the casting technology. The continuous vacuum purifying method includes: vacuumizing the purifying furnace and introducing aluminum liquid to the purifying crucible in the furnace via pipe and cut-off valve by means of the air pressure difference between the furnace and the electrolyzer; growing crystal with cellular interface at high temperature gradient with the growth rate being controlled in 0.5-10 cm; vacuumizing the waste liquid recovering furnace and inflating the purifying furnace with certain amount of protecting gas; and sucking surface liquid layer with enriched impurity every 0.5-3 hr to the waste liquid recovering furnace to maintain the original density. The present invention can produce high-purity aluminium ingot with stable quality in the whole length.

Description

technical field [0001] The invention relates to a method for refining and purifying aluminum, in particular to a method for continuously purifying and purifying high-purity aluminum in vacuum, which belongs to the field of casting. Background technique [0002] Purification and purification of metals, especially aluminum, by segregation is a process that has been widely industrialized. The application number of French PICHENY company is the invention patent of 87100033, once related to this kind of technology. However, we found that when using the segregation method for purification, it is impossible to remove the impurity elements segregated in the purification process simply by relying on natural convection or forced stirring (and the pressure extrusion method after solidification cannot Completely squeeze out the impurity elements), so that when the crystal continues to grow further, the precipitated elements accumulate in the remaining liquid phase, so that the solute c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/04C22B21/06
Inventor 张佼孙宝德丁文江
Owner NANTONG TADE ELECTRONICS MATERIAL TECH