Covering agent for aluminum alloy smelting and preparing method of covering agent

Abstract

The invention discloses a covering agent for aluminum alloy smelting and a preparing method of the covering agent. The covering agent is characterized by comprising, by mass, 20-40 parts of potassiumchloride, 20-40 parts of sodium chloride, 5-15 parts of lithium chloride, 3-5 parts of potassium fluoride, 1-3 parts of sodium hydrogen sulfate and 3-5 parts of sodium fluosilicate. The preparing method comprises the following steps that firstly, the components are prepared according to the weight part; secondly, the raw materials are sufficiently mixed and stirred evenly; thirdly, the mixture obtained in the second step is placed in a baking furnace to be dried, and the drying temperature ranges from 290 DEG C to 300 DEG C; fourthly, the dried mixture is pulverized, and powder of 80-100 meshes is formed through sieving; and fifthly, a waterproof plastic bag is used for packaging. According to the covering agent preparing technology, heat preservation of the covering agent can be effectively improved, the melting temperature is proper, and melting is rapid; a layer of oily film is formed on the surface of a casting, and casting oxidization burnout and air suction can be effectively prevented. Strong chemical stability and heat stability are achieved, molten aluminum and a furnace lining are not corroded, and original components and performance of the alloy are guaranteed.

Description

technical field [0001] The invention relates to a covering agent for aluminum alloy smelting and a preparation method thereof, belonging 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...

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