Phosphorus iron and its preparation methods

Abstract

The invention provides phosphorous pig iron. The phosphorous pig iron comprises, by weight, 3.0%-3.4% of C, 2.0%-2.6% of Si, 0.8%-1.2% of P, 0.5% 0.7% of Mn, the balance iron and unavoidable impurities, and less than 0.15% of S. The invention further provides a preparation method of the phosphorous pig iron. Compared with relevant arts, the phosphorous pig iron and the preparation method thereof have the beneficial effects that the voltage drop between a steel claw and a carbon block is reduced; the production cost of electrolysis is lowered; the properties of the phosphorous pig iron are improved; the defects of cracking, iron infiltration and shrinkage limit of a phosphorous pig iron ring are eliminated; the stability of melted iron is improved; the composition of the phosphorous pig iron is easy to control.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of aluminum electrolysis, in particular to a formula of phosphorus pig iron and a preparation method thereof. [0003] 【Background technique】 [0004] In the production of aluminum electrolysis, phosphorus pig iron is used to cast the anode carbon bowl, connect the steel claw and the carbon anode, and conduct current. Reducing the resistance between the anode steel claw and the anode carbon block is one of the effective ways to reduce the cost of electrolysis, and the best way to reduce the iron-carbon pressure drop is to adjust the phosphorus pig iron, reduce the shrinkage rate of the phosphorus iron ring, and increase the distance between iron and carbon. Contact pressure requires control of phosphorus pig iron composition. In the related technology, the carbon content of phosphorus pig iron is lower than 3%, and the sulfur content is higher than 0.2%. The deficiency of the current technology is t...

AI Technical Summary

Problems solved by technology

In the related technology, the carbon content of phosphorus pig iron is lower than 3%, and the sulfur content is higher than 0.2%. The deficiency of the current technology is that the strength of phosphorus pig iron is higher, and the overall pressure drop of phosphorus pig iron is higher after connecting with steel claws and carbon blocks; In addition, the components in phosphorus pig iron are seriously lost during smelting, and auxiliary materials need to be added for adjustment. It is difficult to maintain consistent conditions during smelting, resulting in large fluctuations in components, for example, the fluctuation of carbon content can reach 1%.