Development of New Refining Process in Two-Stage Slag-Metal Counter Flow Tank Operation Using Two Converters

The conventional dephosphorization method of injecting a powder dephosphorizing agent into molten pig iron in a torpedo car or in a ladle requires the installation of expensive facilities. The new method, called SRP (Simple Refining Process, Slag Recycling Process), which requires lower investment cost and smaller amount of an agent, was developed. In the new method, two converters are used, one as a dephosphorizing reactor and the other as a decarburizing reactor. In the process slag produced in a decarburization reactor is recycled into a dephosphorization reactor as a dephosphorizing agent. The developed method is applied as the manufacturing process in Kashima Works as a requisite technology for producing low phosphor steels.