Sodium-free refining agent for aluminum alloy smelting and using method of sodium-free refining agent for aluminum alloy smelting

Abstract

The invention relates to a sodium-free refining agent for aluminum alloy smelting and a using method of the sodium-free refining agent for aluminum alloy smelting. The sodium-free refining agent and the using method are characterized in that the sodium-free refining agent is prepared from the following raw materials including, by weight, 12-18 parts of calcium fluoride, 12-20 parts of potassium fluosilicate, 10-16 parts of potassium chloride, 10-16 parts of lithium chloride, 12-16 parts of magnesium chloride, 10-14 parts of calcium oxide, 10-14 parts of titanium dioxide and 4-8 parts of carbondust; and the using method includes the following steps that (1) when the temperature of an aluminum alloy smelting furnace reaches 710 DEG C-720 DEG C, the sodium-free refining agent for aluminum alloy smelting is added; and (2) nitrogen or argon is led into a refining tank for purging refining, and sufficient mixing and stirring and drossing are carried out. According to the sodium-free refining agent for aluminum alloy smelting, impurity sodium cannot be led in, influences of detrimental impurities are eliminated, meanwhile, in the process that the aluminum alloy sodium-free refining agentis used, the aluminum alloy smelting temperature is kept at 710 DEG C-720 DEG C, and the purifying effect is good. The using method is simple, convenient and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a sodium-free refining agent for aluminum alloy smelting and a using method thereof, belonging to the technical field of aluminum alloy casting. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. During the production of aluminum alloy, the hydrogen atoms in the solution will spontaneously form hydrogen gas, and the hydrogen gas and inclusions will form bubbles during the solidification of the aluminum alloy solution, causing defects in the aluminum alloy components. At present, the refining agents disclosed in my country generally contain one or more of sodium salts such as sodium chloride, sodium fluoroaluminate, sodium fluoride, sodium fluorosilicate, and sodium sulfate. Sodium is introduced into aluminum-magnesium, aluminum-copper, and ...

AI Technical Summary

Problems solved by technology

At present, the refining agents disclosed in my country generally contain one or more of sodium salts such as sodium chloride, sodium fluoroaluminate, sodium fluoride, sodium fluorosilicate, and sodium sulfate. Sodium is introduced into aluminum-magnesium, aluminum-copper, and aluminum-lithium alloys, resulting in the phenomenon of "sodium embrittlement"