Sodium-free smokeless aluminum alloy environment-friendly refining agent and manufacturing method thereof

Abstract

The invention discloses a sodium-free smokeless aluminum alloy environment-friendly refining agent and a manufacturing method thereof. The environment-friendly refining agent comprises the original compositions of, by weight, 40-49% of magnesium chloride, 20-29% of potassium chloride and 30-39% of aluminum fluoride, and then the environment-friendly refining agent is obtained finally through special melting treatment. Compared with the prior art, the sodium-free smokeless aluminum alloy environment-friendly refining agent is simple in proportion and does not contain sodium, flue gas is not generated in smelting, the industry blank is filled, and meanwhile, the great significance to environment-friendly modern metallurgy is achieved.

Description

technical field [0001] The invention relates to the field of aluminum alloy smelting, in particular to a sodium-free and smoke-free aluminum alloy environment-friendly refining agent and a manufacturing method thereof. Background technique [0002] In the aluminum alloy smelting process, the traditional process is to use pure aluminum ingots or purchase aluminum alloy ingots that meet the national standard for melting, use nitrogen or chlorine to refine degassing and slag removal, and use sodium salt for modification. The mechanical properties of the products produced by this process are low, and the refining effect is poor or pollution occurs, and the effective time of deterioration treatment is short, especially for the batch production time of metal molds or small castings, which has serious restrictions. Most of the refining agents in the prior art have complex components (the more complex the components, the worse the reliability and the lower the controllability), and ...

AI Technical Summary

Problems solved by technology

The mechanical properties of products produced by this process are low, and the refining effect is poor or pollution is generated, and the effective time of deterioration treatment is short, especially for the mass production time of metal molds or small castings.

Most of the refining agents in the prior art have complex components (the more complex the components, the worse the reliability and the lower the controllability), and the applicant has been engaged in the technology for many years, and believes that the existing technology includes the refining of new patented technology There are two common defects in the refining agent: the first is that the refining agent contains sodium or even contains fluorine and sodium at the same time. As we all know, sodium will obviously increase the brittleness and elongation of aluminum alloy, and even easily cause Hot cracking; at the same time, many technical data show that when sodium and fluorine exist in the aluminum alloy smelting environment, it is easy to form a hard substance with a high melting point Na 3 AlF 6 , which is a substance with a melting point of 1009°C (much higher than the conventional technology of aluminum alloy smelting which usually does not exceed 750°C, and it is destined to not melt during the whole process of aluminum alloy smelting, but to exist in the form of a hard solid) , when the aluminum matrix changes from a liquid phase to a solid phase, it will hinder the growth of solid phase grains, causing dislocations, abnormal nucleation, micropores and even cracks. Therefore, although sodium can refine grains and facilitate deterioration, it is not compatible with fluorine There are also unavoidable flaws when there are both

The second is that the refining agent will produce smoke during the reaction, and even some refining agents use the gas generated by the reaction to take away the impurities in the aluminum solution to achieve the purpose of refining, which is harmless or even beneficial to the aluminum alloy smelting itself Yes, but in view of the current national environmental protection requirements and urbanization development process, the living space of the heavily polluting metallurgical industry is severely limited. Therefore, in order to maintain competitiveness in the future competition, it is more important to meet the requirements of environmental protection while achieving the purpose of refining