Maerz kilns, grate kilns - rotary kilns, sleeve kilns, and vertical kilns are currently used; Baosteel mainly uses grate machine rotary kilns, and Shougang mainly uses sleeve kilns. Tangshan Iron and Steel mainly uses Maerz kilns, Wuhan Iron and Steel has several types, and Anshan Iron and Steel has mostly vertical kilns. This depends on the type of fuel and technical mastery. There is no right or wrong way. For specific information, you can check with the China Iron and Steel Association.