Tremensite flotation technology (1) Flotation method of scheelite. The molecular formula of scheelite is CaW04. Because of the calcium content in the molecular formula, it is easy to chemically adsorb and chemically react with fatty acids. Commonly used collectors are vegetable oil oleic acid and 731 oxidized paraffin soap. The vegetable oil oleic acid has a good selectivity and collection property. 731 oxidized paraffin soap has better selectivity but poorer harvesting power.
Scheelite flotation technique since the normally Scheelite various calcium and magnesium phosphates, sulfates, carbonates, fluorides symbiotic their floatability similar, often difficult to select qualified concentrate. To enhance the selectivity of the process, the following methods can be used:
1) with sodium sulfide, cyanides, chromates and the like which inhibit the associated sulfide minerals (mineral sulfide is large, must be separately flotation); water glass, tannins, poly-sodium, chromate inhibit gangue Mineral: The pH of the slurry is adjusted to 9.5 to 10 with water glass or sodium carbonate, and 11 to 12 when selected.
White tungsten ore flotation technology 2) "Lime-flotation" method. The main points are: pulp with lime (about 0.5kg / t), then add sodium carbonate (about 0.15kg / t) and water glass (about 2.2kg / t), and finally with oleic acid and naphthenic acid (both The ratio is 1:1). The method is characterized in that Ca2+ in the slurry is first adsorbed on the surface of the gangue mineral. When sodium carbonate is added, the Ca2+ adsorbed on the surface of the gangue becomes a CaC03 film which is more easily inhibited. Therefore, the concentrate grade can be greatly improved.
The scheelite flotation technology 3) uses a large number of water glass heating selection method (ie Petrov method). The low-grade coarse concentrate is added to 40-90kg/t water glass, heated to 60-90 °C for a period of time, stirred, dehydrated (substantially removing the excess agent from the surface of the gangue), then pulping, and then Select 4 to 8 times to get a higher grade concentrate. If the concentrate contains more barite , the barium sulfate or sulfonate may be used to reverse float flolite at a pH equal to 1.5 or less. When the concentrate contains phosphorus, it may be leached with hydrochloric acid. Select the concentrate to dissolve the phosphate minerals. After solid-liquid separation and washing, the phosphorus content in the scheelite concentrate can be qualified.
The scheelite flotation technology often has some symbiotic minerals (such as tin , molybdenum, etc.) in the scheelite deposit. These symbiotic minerals will enter the scheelite concentrate during the re-election process, affecting the quality of the concentrate. Therefore, In the flotation of scheelite, there is also the problem of separation of tungsten-tin and tungsten-molybdenum. The separation of scheelite and cassiterite can be either electrified or floated. When the flotation is separated, the scheelite is captured by the fatty acid, and the cassiterite is suppressed by the water glass. When the scheelite contains molybdenum, since molybdenum has good floatability, the molybdenum ore may be floated first, and then the scheelite may be floated.
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