The dry process is a traditional and original production process of iron oxide red in China. Its advantages are that the production process is simple, the process is short, and the equipment investment is relatively small. The disadvantage is that the quality of the product is slightly poor, and the calcination process produces harmful gases, which has a significant impact on the environment. Such as the jarosite calcination method, a large amount of sulfur-containing gas is generated during the calcination process.
In recent years, based on the comprehensive utilization of iron-containing wastes, dry processes such as sulfuric acid slag method and iron ore powder acidification roasting method have appeared. The advantages are simple process and low investment, and the disadvantage is that the quality level of the products produced is low. Can only be used in low-end areas.
