Covering agent for aluminum alloy melting

Abstract

A covering agent for aluminum alloy smelting, characterized in that the covering agent is composed of the following components in parts by mass: 15-30 parts of potassium chloride, 20-30 parts of sodium chloride, 4-4 parts of potassium fluoride 6 parts, 2-6 parts of sodium bisulfate, 10-18 parts of lithium chloride, 4-6 parts of sodium fluorosilicate, 4-8 parts of aluminum trichloride, and 2-4 parts of cryolite. The covering agent configuration process of the present invention can effectively improve the heat preservation of the covering agent, prevent secondary oxidation, reduce the thickness of the sintered layer of the covering agent, have suitable melting temperature, fast melting and fast expansion speed, and form a layer of oily film on the surface of the casting. Effectively prevent castings from oxidizing, burning, and getting gas. It has strong chemical stability and thermal stability, has no corrosion effect on molten aluminum and furnace lining, and ensures the original composition and performance of the alloy.

Description

technical field [0001] The invention relates to a covering agent for aluminum alloy smelting, which belongs to the field of aluminum alloy smelting. 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. However, aluminum is a relatively active metal. When it is smelted in the atmosphere, it is easy to form oxide slag and absorb gas. If these oxides and gases enter the ingot with the melt, slag will be formed; oxide film, pores, loose Or other defects, which reduce the physical properties and corrosion resistance of the product, will also deteriorate the processing performance of the alloy. The main reason for this is that the protective effect of the covering agent currently used is too weak before the aluminum scrap is melted. If you do not add molten aluminum and directly heat and melt t...

AI Technical Summary

Problems solved by technology

However, aluminum is a relatively active metal. When it is smelted in the atmosphere, it is easy to form oxide slag and absorb gas. If these oxides and gases enter the ingot with the melt, slag will be formed; oxide film, pores, loose Or other defects, which reduce the physical properties and corrosion resistance of the product, will also deteriorate the processing performance of the alloy. The main reason for this is that the protective effect of the covering agent currently used is too weak before the aluminum scrap is melted. If the aluminum scrap is directly heated and melted without adding molten aluminum (that is, it is often called the empty furnace feeding)

Aluminum swarf oxidizes violently before melting, resulting in reduced yield