Roller kilns belong to continuous kilns, with two types of transmission modes: helical gear transmission and chain transmission. Generally, corundum ceramic rollers are used as transmission rollers to transport products. Mainly used for the firing of catalysts, magnetic materials, ceramics, and powder materials. According to the heating method, it can be divided into two types: gas heated roller kilns and electric heated roller kilns. The atmosphere can be adjusted according to the requirements.