Regulators are a class of chemical reagents utilized in the flotation process to modify mineral surface properties and pulp medium conditions, thereby enhancing separation efficiency. Their primary functions include controlling the pulp's pH level, ionic composition, and the efficacy of collectors. These regulators are broadly classified into five categories: pH modifiers, activators, depressants, dispersants, and flocculants.
pH modifiers optimize the flotation environment by altering the acidity or alkalinity of the pulp; commonly used reagents include lime, sodium carbonate, and sulfuric acid. Activators enhance the adsorption interaction between minerals and collectors, with typical examples such as copper sulfate and sodium sulfide. Depressants reduce a mineral's floatability by disrupting its surface adsorption capacity; common types include sodium sulfide, zinc sulfate, water glass, and starch. Dispersants and flocculants, respectively, control the dispersed or aggregated state of mineral particles; notably, water glass serves a dual function as both a dispersant and a depressant, while polyacrylamide is a widely used flocculant.
Modifiers are reagents used to regulate the action of collectors and the conditions of the flotation medium. They include activators, which promote the interaction between target mineral particles and collectors; pH regulators, which adjust the pH of the medium; depressants, which inhibit the floatability of non-target particles; dispersants, which promote the dispersion of fine non-target particles within the slurry; and flocculants, which induce fine target particles in the slurry to aggregate into larger flocs.
Modifiers constitute one of the categories of flotation reagents. These are chemical agents employed to alter the surface properties of minerals and the characteristics of the mineral slurry (such as the composition of the liquid phase, frothing capacity, and foam properties), thereby enhancing the selectivity of the flotation process and optimizing flotation conditions. Based on the primary function they perform during the flotation process, modifiers can be broadly classified into depressants, activators, pH regulators, flocculants, and similar categories.
