Low-metal-loss smelting method of copper alloy

Abstract

The invention discloses a low-metal-loss smelting method of a copper alloy, which comprises the following steps: (1) adding all the raw materials except fusible and oxidable raw metals into a smelting furnace according to the components contained in the target alloy; after the raw materials are molten, introducing nitrogen or air into the smelting furnace, raising the pressure of the smelting furnace to 1-50 atm, and adding the low-melting raw metals into the smelting furnace; cooling the alloy melt, lowering the pressure of the hearth, and recovering valuable metals by using a micro reducing medium; using high-purity nitrogen, argon or carbon dioxide as a carrier gas, and adding a refining agent into the melt; introducing high-purity nitrogen or argon into the melt by using a rotary sprayer; adding a reducer-slag former mixture into the smelting furnace; and after removing all the furnace slag, adding a covering agent on the surface of the molten metal. The smelting method of the copper alloy can lower the metal loss, effectively remove impurity elements and gas inclusions in the alloy in the smelting process and enhance the refining effect.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for smelting copper alloys with low metal loss. Background technique [0002] During the copper alloy smelting process, the casting cost mainly comes from the loss of metal. Traditional copper alloy smelting generally adopts the smelting temperature system based on the melting point of copper under normal pressure conditions. The main problems of this smelting system are: when smelting brass containing zinc, brass containing lead, and Bronze, cadmium-containing bronze, tin-containing bronze, and copper alloys such as aluminum, magnesium, beryllium, silicon, manganese, zirconium, and chromium, which are easily burnt, have strong metal oxidation and volatilization losses. Although some technological measures are taken, limited by the melting characteristics of the alloy, it often has little effect. For example, brass smelting adopts low-temperature zinc addition, fire-spray sme...

AI Technical Summary

Problems solved by technology

Traditional copper alloy smelting generally adopts the smelting temperature system based on the melting point of copper under normal pressure conditions. The main problems of this smelting system are: when smelting brass containing zinc, brass containing lead, and Bronze, cadmium-containing bronze, tin-containing bronze, and copper alloys such as aluminum, magnesium, beryllium, silicon, manganese, zirconium, and chromium, which are easily burnt, have strong metal oxidation and volatilization loss

The so-called fire-spraying smelting process, in essence, utilizes the characteristics of the low boiling point of metal zinc in copper-zinc alloys, raises the temperature to make metal zinc boil, evaporate, and burn, and there is a strong oxidation loss of metal zinc

In the process of high-temperature slag removal, the surface of the high-temperature alloy copper liquid is unprotected, and there is also strong metal oxidation and volatilization loss

The modern copper alloy smelting process volatilizes, oxidizes and slags a large amount of metals such as zinc, cadmium, lead, tin, aluminum, magnesium, beryllium, zirconium, silicon, manganese and other alloy elements with low melting point and easy oxidation, resulting in high metal loss

[0003] ZL201210076603.0 proposed a brass alloy smelting method to reduce zinc loss, but it only proposed a flame-free refining method for high-zinc brass and complex Metal loss of brass, cadmium bronze, leaded brass, leaded bronze, tin bronze, and copper alloys such as aluminum, magnesium, beryllium, silicon, manganese, zirconium, chromium and other elements that are easily burnt, no measures and methods are proposed