A kind of desulfurizer for waste phosphorus pig iron and desulfurization and carbonization method thereof

Abstract

The invention provides a desulfurizing agent for waste phosphorus pig iron and a desulfuration and recarburization method for the waste phosphorus pig iron. According to the method, the recycled wastephosphorus pig iron is smelted, then, the desulfurizing agent is adopted for desulfurizing, a manganese increasing agent is adopted for manganese increasing after desulfurizing is finished, then, carburant is adopted for recarburization, and silicon increasing treatment is conducted after recarburization. According to the method, desulfurizing treatment is conducted on the waste phosphorus pig iron, then recarburization is conducted, influences of S on recarburization are eliminated, the recarburization efficiency and the desulfuration efficiency are obviously improved, and consumption of rawmaterials, the desulfurizing agent and the carburant is reduced. The method is high in desulfuration and recarburization efficiency and good in effect. Thus, when the waste phosphorus pig iron is treated, even no new phosphorus pig iron is added, the usage requirements can be met through direct treatment of the waste phosphorus pig iron, raw material consumption is further reduced, cost and energy consumption are reduced, and the waste phosphorus pig iron is well recycled and reused.

Description

technical field [0001] The invention belongs to the technical field of metal smelting. Specifically, it relates to a desulfurizer for waste phosphorus pig iron and a method for desulfurizing and increasing carbon. Background technique [0002] In the production process of pre-baked anodes for aluminum electrolysis, molten phosphorus pig iron is usually used to weld anode steel claws and anode carbon blocks. The quality of the phosphorus pig iron ring will directly affect the pouring quality and pouring efficiency of the anode. Moreover, phosphorus pig iron plays the role of connection and conduction, and its quality also directly affects the conduction of the electrode. [0003] There are many alloying elements in phosphorus pig iron, which play a certain role in it. Among them, the higher the C content, the more graphite is precipitated, and the expansion of graphite can reduce the shrinkage of molten iron after cooling; the bonding force between Si atoms and Fe atoms is...

AI Technical Summary

Problems solved by technology

[0008] The technical problem addressed by the present invention is: in the prior art, the decarburization and desulfurization treatment of waste phosphorus pig iron is carried out firstly, followed by desulfurization or carbon increase and desulfurization in parallel, which reduces the carbon increase efficiency and desulfurization efficiency; Greatly increase the consumption of recarburizer and desulfurization, and also increase the consumption of new phosphorus pig iron and foundry pig iron in the process of processing waste phosphorus pig iron, which obviously increases the production cost, causes the consumption of raw materials to increase, and causes the consumption of manpower and material resources

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