... oil field, paper-making, textile, dyeing, petrochemical industry, tanning industry, metallurgical industry and building material industry, and used as a water softening agent ... boiler, as diffusant in papermaking; Retarding agent, floating agent, dispersing medium, high temperature agglomerant, ... Food grade: Mainly used as additive agent, pH adjusting agent, fermenting agent, and nourishment, etc. 3. ...