We provide defoamers for the metallurgical industry, which mainly used for mineral flotation and gold cyanidation. The defoaming agent used in the mineral flotation can maintain a good defoaming effect in a high-shear working environment, which is suitable for potash flotation and other flotation operations of various metal ores such asbauxite, phosphate, etc.  And defoamers for gold cyanidation can be used in various kinds of gold extraction processes and Copper sulfur concentrate flotation.