Preparation method of rare earth phosphorus pig iron for assembling electrolytic aluminum anode

Abstract

The invention relates to phosphorus pig iron and particularly relates to a preparation method of rare earth phosphorus pig iron for assembling an electrolytic aluminum anode. According to the preparation method disclosed by the invention, a formula comprising high carbon or medium carbon, high silicon, high phosphorus, low manganese and high sulfur of the ordinary phosphorus pig iron is changed to the formula with the high carbon, low silicon, medium phosphorus, medium manganese and low sulfur, and a rare earth element is used as a modifier. According to the preparation method disclosed by the invention, the melting time of the phosphorus pig iron is shortened, the high-temperature mobility is improved, and the melting temperature and the energy consumption are reduced; the thermal expansion and contraction matching between the phosphorus pig iron and a carbon bowl wall is improved, the contact resistance is reduced, and the iron-carbon pressure is reduced; and the room temperature brittleness of the phosphorus pig iron and the contact status between a steel claw head and the carbon bowl wall are improved and the rejection rate caused by looseness of a steel claw of the anode is reduced.

Description

technical field [0001] The invention relates to the composition of phosphorus pig iron assembled by electrolytic aluminum anodes. Background technique [0002] The function of phosphorus pig iron in the anode assembly process is to connect the new anode carbon block and the guide rod group together. The connection part is between the steel claw of the guide rod group and the bowl gap of the carbon block. The molten phosphorus pig iron in the state is poured into the gap between the steel claw and the carbon bowl by means of a pouring machine, and after cooling, the guide rod group and the carbon block are combined into one, and then transported into the electrolysis process for use. It has good bonding strength to the steel claw material and carbon quality, which ensures that the anode will not fall off during the electrolysis process. It has good electrical conductivity and ensures the uniform distribution of current among the claws. The used anodes are assembled in the p...

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Problems solved by technology

(2) Phosphorus element is a key element in the anode assembly and pouring. Since the anode assembly and pouring adopts a discontinuous method, the fluidity of molten iron is required to be good. The presence of phosphorus element can reduce the viscosity of molten iron. The combination of phosphorus and iron forms The melting temperature of the crystal is 1050℃, which can significantly improve the fluidity of molten iron, but too much phosphorus content can lead to the increase of the cold brittleness of the phosphorus pig iron ring, which will cause cracks in the iron ring after pouring, and in severe cases, it will lead to falling off.