company news about Metallic silicon block

Metallic silicon block

Application of metal silicon block: aluminum alloy smelting industry used in the industrial silicon particle size is generally different phenomenon, the traditional method of adding silicon for aluminum ingots after melting metal silicon block directly poured on the surface of liquid aluminum, the disadvantages of this addition method are: Among them, the large particles of metal silicon block will directly enter the aluminum liquid due to the effect of gravity, and can melt quickly after stirring, while the small particles of powdered silicon will float on the surface of the aluminum liquid due to its small size and light weight, and it is easy to be covered by aluminum oxides, resulting in melting difficulties. In the subsequent slag cleaning process, if the oxidation slag coated with powdery silicon can be removed, the recovery rate of Si will be low. If it cannot be removed, the powdery silicon residue forms a hard point in the aluminum alloy, which seriously affects the quality of the product and causes difficulties for subsequent processing.

AL-Si alloy production method (CN102230098A), the steps are as follows: (1) in the furnace to add aluminum liquid, aluminum ingots; (2) Add silicon or intermediate alloy, first add the metal silicon block to the melting furnace melting, at the temperature of 730~760°C with electromagnetic stirring thoroughly, evenly stirring for half an hour, to be fully dissolved, and then add the intermediate alloy to the melting furnace, at the temperature of 730~760°C with electromagnetic stirring thoroughly, evenly stirring for half an hour, Ensure that the added raw materials are completely dissolved, so that the chemical composition of AL-Si cast aluminum alloy meets the requirements; (3) The prepared aluminum melt is slagged and degassed, and degassed with powder refining agent and nitrogen to obtain aluminum melt with high purity; (4) Casting. This method is the traditional method of adding silicon to aluminum alloy melting, which inevitably has the above problems.

The invention relates to a method of adding alloying elements to aluminum liquid and an alloying element addition bag (CN102296193A), loading the alloying element powder to be added into aluminum foil bag, and vacuum encapsulation, and putting the alloying element addition bag into aluminum liquid. The structure of alloying element addition bag is that aluminum foil bag is used to contain the alloying element powder required for aluminum alloy production, and the inside of the bag is vacuumed. The method is to put alloying element powder into aluminum foil bag and vacuum package, although the problem of powder floating is solved, but it needs to purchase additional aluminum foil bag and add vacuum packaging equipment, the process is complicated and the practicability is low.