A production process of high-quality aluminum ingots

Abstract

The invention discloses a production process of high-quality aluminum ingots, including ① raw material selection: determining the impurity content in alumina powder; ② preparing electrolyte: adding aluminum fluoride, calcium fluoride and lithium fluoride to cryolite to prepare Electrolyte; ③Electrolysis: produce high-temperature electrolytic aluminum liquid by electrolysis; ④Refining: melt the high-temperature electrolytic aluminum liquid produced by electrolysis at high temperature; Refining treatment, on-line degassing treatment and on-line filtration to obtain molten aluminum; ⑥casting: casting the molten aluminum on-line with a casting machine to form aluminum ingots; ⑦packing: cooling the aluminum ingots on-line , After sawing, bundling and packaging, high-quality aluminum ingots can be obtained. The invention has the advantages of simple process control, low production cost, high production efficiency and less pollution. The aluminum ingots produced by the invention have stable quality and high purity, and the purity can reach more than 99.8%.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis production technology, and in particular relates to a production technology of high-quality aluminum ingots. Background technique [0002] Due to its many unique properties, high-purity aluminum has played an increasingly important role in some high-tech industries. Containers made of its acid corrosion resistance are often used to hold some strong corrosive acids. High-purity aluminum can be drawn into filaments with a diameter of 15 μm, which has been widely used as wiring in integrated circuits. High-energy ion energy such as beams is used as a "solar sail" to drive the movement of spacecraft. In addition, high-purity aluminum has also been widely used in the sputtering target market and the electronics industry. The aluminum purification industry originated from the three-layer liquid electrolysis method invented by the Americans in 1901. In the 1970s, with the development of t...

AI Technical Summary

Problems solved by technology

At present, some manufacturers in our country use the segregation method to produce pure aluminum, but due to the blockade of foreign technology and other reasons, the product purity has not reached a satisfactory result

my country's high-purity aluminum output is quite different from domestic demand, which is not commensurate with the fact that my country's aluminum output has been in the leading position for more than ten years. Due to less investment in research and development, the theoretical results obtained are also extremely limited, which limits high-quality, high-purity, High-efficiency products are put into the market

However, in order to further improve the purity and efficiency of aluminum purification, many domestic units have also done a lot of research work in recent years. On the basis of the traditional three-layer liquid method and segregation method, a cryolite- The production process of high-purity aluminum is produced by alumina molten salt electrolysis. Although this process can realize the production of high-purity aluminum in theory, in the actual production process, the selection of electrolytic raw materials, the selection of materials for the electrolytic cell, the selection of anode and cathode The choice of material will affect the quality of electrolytic aluminum liquid, and with the extension of electrolysis time, electrolysis needs to consume a large amount of anodes, and the impurity content of the anode body will enter the electrolytic cell with the electrolysis consumption, polluting the aluminum liquid, and it is necessary to replace the anode frequently , seriously affecting production efficiency