What is converter slag splash protection technology?

Answer: The converter slag splashing technology is a new technology developed in recent years to improve the life of the furnace. It is based on the technology of adding MgO-containing slag forming agent to the slag to make sticky slag and slag and protect the furnace, which was widely used in the 1970s. The oxygen lance is used to inject high-pressure nitrogen gas, and the steel will be tapped within 2 to 4 minutes. The residual slag remaining in the furnace is spray coated on the entire surface of the converter lining to form the furnace protection technology of the slag protective layer. This technology can greatly increase the life of the converter, with low investment, simple process and significant economic benefits.

This technology was developed by Praxair Gas Company of the United States and first applied in the Great Lakes branch of Republic Steel Company of the United States. After being implemented in the Great Lakes Plant and Granite City Plant, it has not been promoted. In 1991, the Indiana HaBOr plant of the American LTV Company used slag splashing as part of the overall furnace protection. In September 1994, the lining life of the plant's 252t top-bottom combined blowing converter reached 15,658 furnaces, the gunning material consumption was reduced to 0.37kg/t steel, the gunning material cost was saved by 66%, and the converter operation rate increased from 78% in 1987 to 97% in 1994. The slag splashing furnace protection technology can keep the furnace lining balanced for a long period of time during the furnace service period, and realize "permanent" furnace lining.

What is the basic principle of slag splashing furnace protection technology?

Answer: The basic principle of the slag splashing technology is to adjust the remaining end slag composition after the converter is tapped, and use the end slag whose MgO content reaches saturation or supersaturation to form a layer on the surface of the furnace lining by blowing with high pressure nitrogen The high melting point slag splash layer that is well sintered and adhered to the furnace lining is shown in Figure 2-1. This slag splash layer has better corrosion resistance and can reduce the mechanical erosion of the furnace lining during the steelmaking process, thereby protecting the furnace lining bricks, slowing down their damage, and improving the life of the furnace lining.