High-content manganese additive used for producing aluminum alloy and preparing method of high-content manganese additive

Abstract

The invention discloses a high-content manganese additive used for producing aluminum alloy and a preparing method of the high-content manganese additive. The manganese additive in a cake shape or rugby shape and formed by pressing raw material powder. The raw material powder comprises manganese powder, aluminum powder, iron powder and fluxing agents. The manganese powder, the aluminum powder, the iron powder and the fluxing agents are crushed under protection of inert gas, and the high-content manganese additive further comprises a surfactant. According to the high-content manganese additive, by mass, the manganese powder accounts for 86%-97%, the aluminum powder accounts for 2.39%-6.39%, the iron powder accounts for 0%-6%, the fluxing agents account for 0.01%-0.05%, and the surfactant accounts for 0.5%-2%. The density of the formed high-content manganese additive ranges from 3.0 g / cm<3> to 5.0 g / cm<3>. The method includes the steps of 1, crushing, 2, material preparing, 3, material mixing, 4, pressing, 5, drying, 6 packaging and the like. When the high-content manganese additive is dissolved into molten aluminum, the melting temperature is low, the melting time is short, and the recovery rate of manganese is high.

Description

technical field [0001] The invention belongs to the field of additives for aluminum alloys, and in particular relates to a high-content manganese additive for producing aluminum alloys and a preparation method thereof. Background technique [0002] With the continuous development of aluminum processing and aluminum alloy industry, the development of aluminum alloy is listed as a key development technology. Alloying is an important part of the aluminum alloy production process, and the melting of alloying elements in molten aluminum important process. [0003] At present, alloying elements usually include copper, silicon, magnesium, zinc, manganese, iron, chromium and so on. During implementation, the temperature of aluminum alloy melting and casting is usually 710-750°C. Alloy elements with low melting point or high solubility such as silicon magnesium, copper, etc. can be melted directly in the form of elemental metal powder, but for manganese, Alloy elements with high me...

AI Technical Summary

Problems solved by technology

However, the existing manganese additives, iron additives, and chromium additives all require a large amount of flux to melt manganese, iron, and chromium at 710-750°C, so that the effective element content in the manganese additives, iron additives, and chromium additives is relatively low Low, that is, when manganese additives, iron additives, and chromium additives are put into the aluminum liquid, more impurity elements are introduced, which makes the quality of the aluminum alloy poor

In particular, the content of manganese in existing manganese additives can only reach 85%

[0006] Secondly, in order to avoid the loosening of additive products during transportation, the additive products are usually pressed into cakes or balls with higher density. The density of existing manganese additives used in the production of aluminum alloys is usually greater than 5.0g / cm 3 , but for additive products with higher density, there are the following problems: 1. The melting is relatively slow, and the melting time is usually more than 20 minutes, and the melting time is long; 2. The additives added to the aluminum melt tend to sink to the bottom. It will cause the melting speed of manganese powder to slow down, and on the other hand, it will lead to uneven dispersion of manganese powder after dissolution; 3. A dense protective film will be formed on the surface of the denser additive product during the melting process, which will cause the inside to fail to continue melting, so that It will make the recovery rate (that is, the melting rate of manganese) low. At present, when the existing manganese additive is melted in the aluminum liquid, its melting temperature is 710-750 ° C, and the highest manganese recovery rate reaches 80% in 15 minutes.

[0007] In summary, when the existing manganese additives are dissolved in molten aluminum, the melting time is longer, the melting temperature is higher, and the recovery rate of manganese is low, and the melting time, melting temperature, and recovery rate of manganese need to be further improved

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