[China Aluminum Industry Network] On December 3, the 2015 (2nd) China International Aluminum Fusion Summit was held in Harbin with the theme of “focusing on casting technology, leading the future of processing, focusing on technological exploration, and achieving mutual benefits”. The conference was organized by Shanghai Cosmos Business Development Co., Ltd., China Nonferrous Metals Processing Industry Association, and Harbin Dongsheng Metal Materials Co., Ltd. As the industry's melting and casting industry exchange platform, the conference gathered experts and scholars in the industry and production technology elites. Explore the production technology and jointly promote the technological upgrading of the casting industry and promote the development of the industry.

Wang Xiaodong, general manager of sales of Harbin Dongsheng Metal Materials Co., Ltd. delivered a keynote speech entitled "Technical Changes in the Addition of Aluminum Alloy Elements."

At the beginning, Wang always thrown a question: How to add high melting point and low solubility to metal?

Of the more than 500 kinds of aluminum alloys used in modern industry, about 480 kinds need to add different kinds of alloy elements to adjust the elemental composition required in the alloy. The smelting temperature of normal aluminum alloys is generally between 710 and 760 degrees. Alloying elements with low melting points and high solubility can be directly added, such as magnesium and zinc. However, due to the low limit of the melting temperature of aluminum alloys, a large part of alloying elements cannot be directly added, such as magnesium, manganese, and titanium. The melting points of these metal elements are mostly above 1000 degrees.

How to solve this problem? In the course of the development of the industry, there have been three generations of technological changes.

Based on the previous generation technology: aluminum-based master alloy.

Refers to melt the primary aluminum, by raising the temperature of the aluminum liquid, a certain high-melting element element is added to the aluminum liquid in a certain proportion, and the intermediate product to be used after casting is used, and is used to adjust the alloy composition when producing the alloy product.

Production Process:

Charge preparation—furnace installation—heating and melting—adding target metals or compounds—stirring—refining slag—stirring—casting.

Advantages: easy operation, good alloying, easy to control alloy composition;

Disadvantages: high energy consumption, high metal loss, high cost.

Second-generation technology: flux additives.

This technique uses 75% of pure metal powder and 25% of flux to fully mix and compress. The flux is used to increase the local temperature to melt the high melting point metal and melt it into the aluminum liquid to achieve alloying effect. This technique is very widely used in rolled products.

Additive production process:

Milling - screening - mixing - drying - pressing - testing - packaging.

Advantages: Reduce costs, effectively reduce the energy consumption and metal burning caused by secondary melting, and at the same time reduce labor intensity due to high content and added amount.

Disadvantages: More slag will increase the chance of slag inclusion in the melt; more smoke will produce smoke and dust pollution to the environment; more harmful gases, harmful to the health of smelting workers.

Third-generation technology: aluminum additives.

With pure aluminum powder as the matrix, 80% of the target metal powder and 20% of the active aluminum powder are pressed.

The aluminum alloy additive not only has the advantages of the intermediate alloy and flux additive, but also solves the "three high" problem of the intermediate alloy "three high" problem and the flux type additive. The cost is also unique. Compared with the master alloy, the aluminum additive has a cost saving of 48.65 million yuan per 100,000 tons of 3003 alloy; and 300,000 yuan per 100,000 tons of 3003 alloy compared to the flux additive.

It is estimated that the annual output of aluminum products in China will reach 30 million tons in 2015. If all the third-generation products are used to cast alloys, the benefits will be considerable. (China Aluminum Network reporter Shao Qiping)

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