Used as water softener for boiler water and industrial water (including dye production water, titanium dioxide production water, printing and dyeing water, washing color film copy water, chemical water, reagent production water, etc.), water treatment agent for industrial circulating cooling water; also used as corrosion inhibitor, flotation agent, dispersant, high temperature binding agent, dyeing auxiliary, metal surface treatment, rust inhibitor, detergent Auxiliaries, cement hardening accelerators . Coated paper is produced as a slurry diffuser to improve permeability. It is also used in washing utensils and chemical fibers to remove iron ions from pulp. Used in the petroleum industry to prevent rust of drilling pipes and to control the viscosity of mud during oil drilling. Mainly used as water softener for boilers, water softener for printing, dyeing and dyeing bath, and paper diffusion agent. It is also used in corrosion inhibitors, flotation agents, dispersants and high temperature binders. Others are used in washing utensils and chemical fibers to remove iron from pulp. It is also used for soil analysis.