Polyether coagulants are one of the few solutions that are effective against the colloidal silica formed during acid leaching of slags or ores containing silicates. POLYSIL® RM 1250, POLYSIL® RM2050 and POLYSIL® RM 3560 coagulants are liquid products that offer an economic solution for the treatment of colloidal silica in a wide range of applications.
The natural silica found in minerals has a low aqueous solubility. When these minerals are digested in strong acids at elevated temperatures, large amounts of silicic acid are released; this can polymerize in solution to form colloidal silica.
Colloidal silica in a hydrometallurgy process can interfere with flocculation and crystallization, and initiate CRUD formation in solvent extraction. Polyether coagulants have a ‘lock and key’ relationship with the surface of colloidal silica formed by the polymerization of silicic acid.
Coagulating the colloidal silica with POLYSIL®coagulants can improve process efficiency and reduce reagent losses by minimizing CRUD formation.
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