Method for removing impurities in furnace during production of oxygen-free copper rods for bridge bus

Abstract

The invention discloses a method for removing impurities in a furnace during production of oxygen-free copper rods for a bridge bus. The method comprises the following steps: encapsulating impurity removing composition in a copper box or a charcoal box; during feeding, placing the copper box or the charcoal box containing the impurity removing composition together with cathode copper into a melting bin for melting, wherein the weight of the impurity removing composition is 0.3%-1.5% of the total weight of raw materials in the melting bin; and filtering out products of reaction of the impurity removing composition and the impurities in the furnace. The impurity removing composition comprises calcium oxide, natron, praseodymium oxide and cerium oxide, of which the weight part ratio is (5-20) to (8-18) to (1-3) to (1-5). The method for removing the impurities in the furnace during production of the oxygen-free copper rods for the bridge bus has the advantages of simplicity in operation, safety, environmental friendliness and the like.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a method for removing impurities in a furnace while producing an oxygen-free copper rod for a bridge busbar. Background technique [0002] When electrolytic method is used to produce oxygen-free copper, the melting furnace device is equipped with melting inductor and heat preservation inductor, and the above inductor includes coil, iron core water jacket and melting channel. When working, a strong current is generated in the melting channel to melt copper into copper liquid. Copper raw materials often contain impurities such as sand. At high temperatures, the sand reacts with copper to form cuprous silicate. After the temperature drops, cuprous silicate adheres to the surface of the melting channel, reducing the effective surface area of ​​the melting channel and reducing the temperature of the furnace. heating effect. There are two methods in the prior art to solve the above ...

AI Technical Summary

Problems solved by technology

Copper raw materials often contain impurities such as sand. At high temperatures, the sand reacts with copper to form cuprous silicate. After the temperature drops, cuprous silicate adheres to the surface of the melting channel, reducing the effective surface area of ​​the melting channel and reducing the temperature of the furnace. heating effect

There are two methods in the prior art to solve the above problems. One is to stop the furnace. When the temperature drops to normal temperature, remove it by mechanical or pickling. This method needs to stop the furnace for operation, and restarting the furnace requires a large amount of electric energy and It is labor-intensive and wastes production time; one is to use sodium fluoroaluminate as a cleaning agent, put the cleaning agent on the surface of the melting channel, and repeatedly stir the copper liquid with a wooden stick to make the cleaning agent contact with the surface of the melting channel to eliminate impurities. The disadvantage of this method is that during cleaning, the copper liquid of this batch is polluted and mixed with new impurities. At the same time, the cleaning agent sodium fluoroaluminate will release highly toxic hydrogen fluoride gas when it encounters acid liquid, and the workshop will often Acid solution is used to clean copper raw materials, so this is a big hidden danger, which seriously threatens the health of workers

Images