Metallurgical soil industry is used to extract rare metals; glass industry is used as etchant; brewing industry is used as bacteria inhibitor for beer disinfection; machinery industry is used as metal surface chemical polishing agent; wood industry is used as corrosion agent Chemicalbook; chemical analysis is used as ion Masking agent for detection, drop reagent for content, precipitant for combined titration of aluminum; used to configure titration solution to determine the components of lead, copper, zinc in copper alloy, iron ore and coal tar.