A kind of phosphorus pig iron carburizing method

Abstract

The invention relates to the field of aluminum electrolysis production, in particular to a recarburization ball for prebaked anode casting, a preparation method of the recarburization ball and a phosphorous pig iron recarburization method. The recarburization ball for prebaked anode casting is prepared by pressing 95.5%-98.5% of a carbon material, 1.0%-3.5% of a binder and 0.5%-1% of carbonate by mass percent into a pellet. The carbon material is cathode milling face powder generated in the aluminum cathode processing process. The preparation method is simple, the prepared recarburization ball is low in cost, and the recarburization effect on phosphorous pig iron is good. The phosphorous pig iron recarburization method comprises the steps that a recarburization agent and a phosphorous pig iron raw material are added into an intermediate frequency furnace in a layered manner, and then smelting is carried out. The method is high in carbon absorptivity and good in recarburization effect, and it can be guaranteed that the new phosphorous pig iron carbon content is controlled to range from 3.0% to 3.5%; meanwhile, material flying losses in the phosphorous pig iron recarburization process can be effectively reduced, and the workshop environment can be improved; and the flowability phosphorous pig iron liquid is good, and the obtained phosphorous pig iron meets the requirement of phosphorous pig iron for prebaked anode casting.

Description

technical field [0001] The invention relates to the field of aluminum electrolysis production, and in particular to a method for increasing the carbon content of phosphorus pig iron. Background technique [0002] In the production of aluminum electrolysis, the prebaked anode is called the "heart" of the electrolytic cell. The prebaked anode is composed of an anode carbon block and an aluminum guide rod, specifically the gap between the steel claw of the aluminum guide rod and the carbon bowl of the anode carbon block. The phosphorus pig iron water is poured, and after cooling, the anode carbon block and the aluminum guide rod are combined into one, and the phosphorus pig iron plays the role of connection and conduction. Reducing the Fe-C pressure drop of the prebaked anode is one of the ways to reduce the production cost of electrolytic aluminum, and practice shows that adjusting the element ratio of phosphorus pig iron is the best way to reduce the Fe-C pressure drop. [0...

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Problems solved by technology

The anode carbon particles selected by this method have a relatively large proportion, which can reduce the flying loss and environmental pollution during the carburization process. Due to the long-term immersion of the electrolyte in the electrolytic cell, it contains a large amount of electrolyte, which leads to the impurity of the electrolytic residual electrode particles, which contain many electrolyte particles and powders, and the electrolyte contains Na, Al, O, Si and other elements. These impurities The elements will enter the phosphorus pig iron water with the recarburizer, destroying the chemical composition of the phosphorus pig iron, and then affecting the performance of the phosphorus pig iron

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