ã€China Aluminum Industry Net】1. Recovery, baking and sifting of aluminum swarf Recycling of aluminum scrap When cutting aluminum, the chips account for about 20% of the weight of the casting, up to about 30%. The aluminum shavings in the recycling process of the product can reduce the production cost and have good economic benefits. Aluminum scrap recycling work should pay attention to the following points: (1) When a certain material grade of the workpiece is processed, it should be promptly received by the country to prevent aluminum scraping. During recycling, aluminum scraps in the chassis of various machine tools that participate in cutting should be cleaned. (2) Aluminum scraps to be recycled should be stacked strictly in the specified bins of the storage yard according to the classification of the grades, and the aluminum scraps should be marked. The type of brand, when conditions are met, should be remelted in time to avoid mixing numbers. (3) It should be avoided that dust, such as sediment and cotton yarn, is mixed with aluminum chips.
1.1 Preheating of aluminum shavings Aluminum chips with a lot of oil and moisture. Oil and moisture from the machining process, or other processes (such as in order to improve the homogeneity of the failure of the piston parts, the temperature of the oil furnace furnace failure process), oxidation corrosion is serious, it should be timely preheat baking. The baking temperature of aluminum shavings must be determined according to various factors. If the temperature is too high, not only the heat loss will be great, but it will also cause strong oxidation of aluminum chips. Therefore, the general baking temperature should be brewed between 250 ~ 300C.
A simple way to bake aluminum chips is to place the aluminum chips on a steel plate and heat them until they do not emit smoke. It can also be used to put aluminum scraps into the "baking car" and push it into the drying kiln to bake or add the aluminum scraps to the industrial frequency furnace and bake it in a cast iron pot to make the oil and volatile oil evaporate at high temperature. And burning, and then melting (of course, this method has the disadvantage of poor working conditions, smoke filled the workshop) J aluminum preheat baking can not only remove the oil and water in the aluminum shavings, but also can shorten the melting time, in the reduction of power consumption At the same time, it can increase the productivity of melting equipment and reduce the cost of melting (remelting).
L.2 Aluminum sifting After the aluminum swarf has been baked, it is better to be sifted to remove the oxidized powder or the entrapped mud sand and the steel shavings that may have formed. However, if the aluminum shavings are “fresh†and clean, and the baking temperature is normal, it is not necessary to screen. Through the above-prepared aluminum scrap, it can be used for remelting remelting, casting into a reclaimed ingot for use in smelting aluminum alloys.
2. Aluminum smelting In industrial frequency furnaces, the smelting methods of smelting aluminum swarf generally have two types: (1) Two smelting methods: Depending on the chemical composition, aluminum swarf is melted into ingots (recycled ingots); In the second smelting, the recycled ingot is smelted into the finished product. (2) Direct addition method: When using this method, the aluminum chips can be directly baked in the furnace (using the waste heat or the bottom temperature), and after the aluminum chips are dried, the temperature is increased to melt and added to the various materials. The main and auxiliary materials are smelted.
Compared with the two methods, twice smelting, power consumption and elemental burning are larger. 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. In the same period of production of multi-god brand aluminum, the use of the first method is more applicable.
Vanity Lights,Glass Vanity Light,Indoor Solar Lights,Stair Lights Indoor
Foshan Nanhai Pinming Electrical Appliance Co.,Ltd , https://www.mavcadonf.com