Nuisanceless powder injection refining flux

Abstract

The invention relates to a nuisanceless powder injection refining flux belonging to a flux for casting. Aiming at the problem that a hexachloroethane powder injection refining flux inevitably generates toxic chlorine gas and fluorine gas which are harmful to the health of an operator, etch equipment and tools and cause serious pollution to the environment to generate public hazards. The nuisanceless powder injection refining flux is characterized by comprising the following components in percent by weight: 15-25 percent of Na2SiF6, 5-15 percent of Na2SO4, 5-15 percent of Na2NO3, 5-15 percent of CaF2, 15-25 percent of KCl and the balance of NaCl added to 100 percent. The NaCl and the KCl are combined to achieve favorable spread performance, coverage and separability; the Na2SiF6 produces non-toxic and volatile SiF4 and AlF3 and SiO2 with good slagging performance; a large quantity of hydrogen and other impurities can be taken out in the floating process of a fusant; the CaF2 promotes slag bodies to flow, and the Na2NO3 enables the fusant to raise the temperature partially, and a small quantity of molten aluminum or aluminum alloy doped in slag is dropped back to the fusant. On trial, the nuisanceless powder injection refining flux shows a favorable refining effect and has the beneficial effect of no toxicity or public hazards.

Description

technical field [0001] The invention belongs to the technical field of casting flux, in particular to a pollution-free powder-spraying refining agent for refining aluminum or aluminum alloy melts. Background technique [0002] Refining and modification are essential processes in the smelting process of aluminum or aluminum alloy. In the past, hexachloroethane refining and fluorine salt modification processes have been used, among which hexachloroethane powder spraying refining agent is more commonly used. Hexachloroethane is the most toxic of chlorinated hydrocarbons. It has an anesthetic effect on the central nervous system of humans and animals, damages the liver and kidneys, and slightly stimulates the skin and mucous membranes. Dizziness, vomiting, liver pain, increased blood bilirubin, slow heart rate, nephritis and anuria. The refining process using hexachloroethane powder spraying refining agent will inevitably produce gases mainly composed of chlorine and fluorine....

AI Technical Summary

Problems solved by technology

The use of such powder spraying refining agent firstly endangers the health and even life of operators; secondly, it severely corrodes equipment and tools; more seriously, it causes serious pollution to the surrounding environment and causes public nuisance.