The existing literature on scheelite notation is quite extensive, because the gangue minerals vary in quality and quantity not only from mine to mine; but also within the same deposit with progress in mining, in principle, each ore dressing plant has its own recipe, and this will always be adjusted to the variations in ore constitution. Although patents have been granted, the detailed procedures are kept secret by most companies.
The following chemicals and conditions are generally in use:
Collectors. Oleic acid, mixtures of oleic and linolic acid, sodium oleat, tall oil, saponified tall oil and mixtures of these substances, coriander oil, rape oil, mustard oil, pyridine base, water-soluble carbohydrates of the green oil type, also in saponated form, fatty acids and their salts, fish oil, hydroxyl-ethylene- cellulose, carboxy-methyl-cellulose.
Frothers. Alcohols, cresylic acid, aerosol, oil of turpentine, ketones.
Depressants. Quebracho or tannin for calcite, formic acid for apatite, lactic acid for mica, and sodium salts of hydrolyzed polyacrylnitrile.
The optimal pH value is between 9.0 and 10.5 and must be controlled to a tolerance of ±0.1 units, depending on the ore composition and the reagents in use. Sodium carbonate or sodium hydroxide solutions are used for pH regulation.
Sodium silicate serves as a dispersant for calcite. The addition of polyacrylamide or flocculents increases the flotation yield.
Please visit our website www.tungsten-powder.com
没有评论:
发表评论