Rare earth contained deslagging and refining flux for smelting of cast aluminium alloy and preparation method of flux

Abstract

The invention discloses rare earth contained deslagging and refining flux for smelting of a cast aluminium alloy and a preparation method of the flux. The flux is formed by adding finely powdered rare earth oxide and rare earth carbonates to powder mainly containing sodium chloride, potassium chloride, sodium fluoroaluminate, sodium fluosilicate, sodium carbonate and calcium fluoride, and then carrying out mixing, dehydration and curing. Based on the characteristics of metamorphism and inactivation of rare earth on the aluminium alloy, the characteristic of promoting a series of low-melting-point impurities to form infusible compounds, and other characteristics of rare earth, if the flux is used during the smelting, a molten aluminium alloy can be effectively purified, the liquidity and casting property can be improved, the refinement of crystal grains in an aluminium alloy casting structure and dispersed precipitation of a second phase in the crystal grains can be facilitated, thus the strength, hardness, abrasive resistance and corrosion resistance of the aluminium alloy can be improved. With the adoption of the flux, the disadvantage that the conventional aluminium alloy deslagging and refining flux produces a large amount of harmful gas and smoke in a molten aluminium alloy purification treatment process is overcome.

Description

technical field [0001] The invention relates to a slag-removing and refining flux used for purifying aluminum alloy melt during the smelting process of cast aluminum alloy and a preparation method thereof. Background technique [0002] The smelting process of cast aluminum alloy is divided into melting, adjusting composition, slag removal and refining, modification treatment, adjusting temperature and pouring. Due to the uncleanness of the charge, the heated surface of the charge is oxidized, resulting in a certain amount of inclusions and gases inside the molten aluminum alloy liquid, and there is scum or slag composed of metal oxides and a mixture of foreign impurities on the liquid surface. This scum and inclusions and gases dispersed in the melt must be removed to ensure the purity of the casting structure. Therefore, slag removal and refining is a necessary purification process. Generally, 1) flux treatment is used, including volatile flux such as hexachloroethane, an...

AI Technical Summary

Problems solved by technology

Although the above treatment process can remove the gas and 40%-80% oxides and intermetallic compounds in the aluminum alloy liquid to varying degrees, it also produces a large amount of smoke and toxic and corrosive gases at the same time, which deteriorates the working environment and makes the alloy melt The loss rate increases, and it is difficult to obtain an aluminum alloy material with a dense structure, no slag, no bubbles and inclusions

Images