It is used in the electroplating industry to prepare electroplating solutions, which can form complexes with iron. In the wool spinning industry, it is used as a wool degreaser and bleaching agent. The paper industry is used for the bleaching of paper and vegetable fibers. In the printing and dyeing industry, it is used as an auxiliary agent for printing, dyeing and fine bleaching. The daily chemical industry is used as toothpaste additive, which can form a colloid with calcium hydrogen phosphate and play a stabilizing role. As a water softener in water treatment. Used as a rust remover in machining. Used as dispersant and emulsifier in chemical production. It can also be used in water treatment agents, oil drilling, etc., as a quality improver, emulsifier, buffer, chelating agent, etc. in the food industry.