Method for segregation and purification of high-purity aluminum

Abstract

The invention discloses a method for segregation and purification of high-purity aluminum. The method comprises the following steps that a segregation furnace is started up for preheating, a non-stickaluminum coating is sprayed on the inner wall of a crucible, and then the inner wall of the crucible is preheated, the preheated crucible is put unit the segregation furnace, metal molten aluminum orrefined electrolytic aluminum liquid is poured into the crucible, the cooling water on the outer wall of the crucible is opened, when the temperature of the aluminum liquid is reduced to a set value,the upper cover of the segregation furnace is closed, and a heating device, a stirring device and a vacuumizing device of the segregation furnace are opened; during the solidification and growth of an aluminum crystal, the temperature of an aluminum melt is controlled through a temperature measuring device, a purification heat conducting layer is subjected to forced cooling through a cooling device, a temperature gradient of the solid-liquid interface of the aluminum melt in the crucible is controlled between 5 DEG C and 20 DEG C, the growth rate is monitored in real time, and the heating temperature and the cooling water flow of the segregation furnace are adjusted and corrected in real time according to the growth rate. According to the method, the solid-liquid interface can be accurately controlled to maintain a stable temperature gradient, the concentration of impurities in the melt at the front edge of the solid-liquid interface is reduced, thus the solidification process is controlled, and high purification efficiency and quality is maintained.

Description

Technical field: [0001] The invention relates to the technical field of casting metallurgy, in particular to a method for segregating and purifying high-purity aluminum. Background technique: [0002] With the continuous progress and development of science and technology, high-purity aluminum is widely used in the fields of electronics, aviation, aerospace and defense industries, and its consumption is increasing year by year. Purification of metals, especially aluminum, by segregation is a mature industrial process. Segregation purification technology currently mainly includes distribution crystallization method, zone smelting method and directional solidification method. Among them, the directional solidification method has the advantages of low energy consumption, relatively simple equipment and process, and high yield. It is suitable for mass production of 4N to 6N high-purity aluminum, and is the main research and development direction of high-purity aluminum purificat...

AI Technical Summary

Problems solved by technology

However, this invention has some disadvantages in the process of use: 1. Since all operations are completed in a single furnace body, workers need to operate step by step, and the efficiency is relatively low; 2. When multiple segregation furnaces are produced at the same time, workers need to rush between multiple devices , prone to operating errors, reducing production efficiency, but also increasing labor intensity

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