Process for preparing potassium sulphate crystals, potassium sulphate crystals prepared accordingly, and growth-enhancing agent for potassium sulphate crystals

摘要

For the purpose of preparing potassium sulphate crystals by reacting a saturated potassium chloride solution with langbeinite in the solid phase at from 45 to 55 DEG C, a growth-enhancing agent is proposed, comprising a monosulphonated or monosulphated surfactant and a neutralised disulphonated surfactant in a weight ratio from approximately 0.14 to 0.60.