The beneficiation of scheelite can be combined with re-election and flotation, or a single flotation method according to the characteristics of ore-dyeing. Individual scheelite ore dressing plants are also pre-enriched, such as King Island white in Syria. The tungsten ore dressing plant uses the ultraviolet fluorescent picker to select 50% of the waste rock from the ore. The grade is lower than the tailings discharged from the ore dressing plant. The recovery rate of the scheelite is 90~96%, and the picking capacity of the equipment is 35. ~40 tons / Taiwan, when.
The scheelite deposit is often accompanied by a variety of sulfide ore. Among them, molybdenum ore is especially common. In the process of beneficiation, the sulphide ore is generally floated and then the scheelite is floated. The flotation of scheelite is carried out in an alkaline medium. The pH of the slurry is adjusted to 9~10.5 with sodium carbonate and sodium hydroxide. The commonly used inhibitor is water glass (modulus 2.2~3), white bark juice. , tannins and various phosphates. Commonly used collectors are oleic acid, sodium oleate, tart oil, oxidized paraffin soap, etc. These collectors all have foaming properties, generally no additional foaming agent.
The scheelite has good floatability. In the ore, the flotation process is complicated by the presence of calcium-containing gangue minerals similar to their properties, such as calcite , fluorite , and apatite. To improve the selectivity of the flotation process, the polyvalent metal salt (such as ferrous sulfate) was added to the water glass, can significantly improve the flotation effect scheelite.
Increasing the temperature of the slurry is also an important measure to improve the flotation of white tungsten. The Petrov method uses the slurry to heat up to 70-90 ° C, adding a large amount of water glass, so that the collector on the calcite surface is desorbed, scheelite Get selectively floating up.
A "lime method" flotation developed by Vazquez et al. of United Carbide Corporation of the United States can make scheelite have excellent selectivity in the presence of fluorite, contrary to the general theory. It is beneficial to add an appropriate amount of lime during the flotation process. It is considered that lime is added to the flotation system, and calcium ions are adsorbed on the surface of fluorite, calcite and quartz , which causes surface charge changes, from negative to positive, and white. Tungsten ore still maintains a negative charge. Then, when sodium carbonate is added to the slurry, the calcium carbonate precipitates on the surface of quartz, fluorite and calcite, while the scheelite is still negatively charged and the surface is not precipitated. After the addition of water glass, the inhibition of the other calculus is enhanced, thereby improving the selectivity of scheelite with calcite and fluorite flotation.
Shear flocculation flotation has been successful for the first time at the Yxioberg white tungsten concentrator in Sweden. This is a promising approach to improving the flotation of fine-grained scheelite. The method is to add an appropriate amount of flotation agent in the mixing tank before the white tungsten flotation, and control the pH and concentration of the slurry. Under strong stirring, the hydrophobic mineral particles collide with each other, and the water film is thinned to form hundreds of particles. The scheelite granules of the granules increase the effective size of the granules and are more likely to adhere to the bubbles and rise quickly. Recent semi-industrial tests conducted in Australia have shown that when the ore grade 0.83% WO 3 scheelite ore is ground to 40-70%-15 microns, the recovery rate by conventional flotation is about 74% when the slurry is sheared. When flocculation is pretreated and then floated, the recovery rate is increased to 83%, the grade of coarse concentrate is also increased from 5% WO 3 to 6% WO 3 , and the value of multi-recovered tungsten is the cost of shear flocculation process. Times.
There are not many white tungsten flotation plants in China, accounting for about 5% of the processing capacity of tungsten processing plants. Floor finishes Baoshan scheelite flotation plant originally oleic acid as collector, with彼得洛夫法加temperature selection, after the collector in place of oleic acid to "731" oxidized paraffin soap, which is a sub-oil industry The production, the source is wide, the price is low, the pulp does not need to be heated during the flotation, and the high-quality selection index is obtained at room temperature, and it has been promoted and applied.
The search for a suitable pharmaceutical system and the implementation of normal temperature flotation are the development trend of scheelite flotation. Recently, in some studies of white tungsten ore dressing, “lime method” flotation was used, and oxidized paraffin soap was used as a collector at room temperature. Flotation yields high grade (>65% WO 3 ) sulphur concentrate and high recovery. In order to ensure high recovery rate, in order to ensure high recovery rate, in many cases only low grade (15~30% 6WO 3 ) concentrate is required, and then submitted to chemical beneficiation to produce synthetic white tungsten or ammonium paratungstate. Such products are economically advantageous, which is widely adopted abroad.

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