[China Aluminum Industry Network] 1 aluminum scrap recovery, baking and screening

1. Recovery of aluminum scrap

When aluminum castings are machined, the chips account for about 20% of the casting weight and as high as 30%. Recovering the aluminum shavings in the commodity machining process can reduce production costs and have good economic benefits. The following points should be taken into account when retrieving aluminum scrap: (1) When the processing of the workpiece of a certain raw material trademark is completed, it shall be promptly received by the country to prevent aluminum scraps from mixing. When repossessing, the aluminum scraps in the chassis of various machine tools involved in cutting shall be cleaned up. (2) The recovered aluminum scraps shall be stacked in the storage bin's regular bins strictly according to the trademark classification and marked with aluminum scraps. The type of trademark should be remelted in time when conditions permit, to prevent mixed numbers. (3) Prevent dust, cotton, and other debris from mixing with aluminum chips.

1.1 Preheating baking of aluminum flakes

Aluminum shavings carry a lot of oil and moisture. Oil and moisture from the machining process, or other technical processes (such as in order to improve the failure of the piston part of the uniform process, the temperature of the selected oil furnace temperature failure technology), oxidation rigorous, it should be timely preheating baking. The baking temperature is necessary to determine according to various aspects of the Song Song. If the temperature is too high, not only the heat loss will be great, but it will also cause intense oxidation of the aluminum shavings. Therefore, the baking temperature should usually be controlled between 250 and 300C.

The simple method of baking aluminum chips is to place the aluminum chips on the steel plate and heat them until they do not stop smoking. It can also be used to put aluminum scraps into the "roasting car" and push it into the drying kiln for baking or the aluminum scraps to participate in the industrial frequency furnace and bake it in a cast iron pot to make the oil and evaporation at high temperature. Burning and then smelting (of course this method has the disadvantage of poor working conditions, smoke filled the workshop) J aluminum preheated baking can not only remove the oil and water in the aluminum, and can shorten the melting time, in the reduction of power consumption Together, it can improve the yield of melting equipment and reduce the cost of melting (remelting).

L.2 Screening of aluminum chips

After the aluminum scrap is finished, it is preferably subjected to a screening treatment to remove the oxidized powder or the noxious mud sand that can occur and the steel scrap brought in. However, if the aluminum shavings are "fresh" and clean and the baking temperature is normal, no screening is required. Through the above-mentioned pre-treated aluminum scrap, it can be used for remelting remelting, pouring into a reclaimed ingot for use when smelting aluminum alloys.

2. Smelting of aluminum scrap in industrial frequency furnace

There are usually two kinds of smelting methods for aluminum swarf: 1 twice smelting method: on the previous time, aluminum swarf is melted into ingots (reclaiming ingots) and stacked according to their chemical composition; during the second smelting, the recycled ingots are put into the furnace. Melting products. (2) Direct participation method: When this method is used, aluminum chips can be baked directly in the furnace (using waste heat or bottom temperature). After the aluminum chips are dried, they are heated to melt and participate in various The main and auxiliary materials are smelted.

Comparison of the two methods, two smelting, greater power consumption and elemental burns. The management work is cumbersome and wastes manpower and material resources. The second method is only applicable to the continuous production of a brand of aluminum castings. When producing aluminum parts with multiple trademarks at the same time, it is more appropriate to rely on the former method.

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