The beneficiation of Scheelite ore
The coarse-grained scheelite is still recovered by gravity separation, and the fine-grained scheelite is generally recovered by flotation.
Scheelite flotation is generally divided into a rough selection section and a selection section. The rough selection section is for the purpose of maximizing the grade of the coarse concentrate, and the selection section is for the purpose of the tungsten concentrate to meet market demand.
Therefore, in order to obtain qualified tungsten concentrate, it is often necessary to adopt a more complicated process and multiple selections to achieve the goal.
In the research and practice of scheelite flotation, the rough separation process includes lime+sodium carbonate method and sodium carbonate method. Generally, short rough separation and long sweep separation are used.
The key to the scheelite concentration section is to separate calcium-containing gangue minerals from scheelite. The scheelite coarse concentrate selection process includes room temperature method and heating method. The room temperature method is not very adaptable to ore, and the selection index fluctuates greatly. The WO3 grade of flotation scheelite concentrate is generally 55% ~ 60%. Containing high impurities, usually by adding hydrochloric acid leaching method to finally achieve the purpose of recovering WO3 more than 65% tungsten concentrate.
The room temperature method is commonly used in quartz vein mines and mines with low calcium mineral content. The calcium mineral content, especially mines with high fluorite content and low tungsten content, generally use the heating method.
The separation of scheelite and calcium gangue minerals such as calcite and fluorite minerals is also very difficult, so the research on scheelite flotation reagents and flotation equipment is very important.
Scheelite collectors can be divided into 4 categories: anionic collectors, cationic collectors, amphoteric collectors and non-polar collectors. The most commonly used are anionic collectors.
In addition, the combined use of collectors is also a research focus.
Anionic collectors mainly include fatty acid, sulfonic acid, phosphonic acid, hydroxamic acid and chelating collectors.
Cationic collectors mainly refer to amine collectors, and amphoteric collectors are amino acid collectors.
Our special chemical:
An effective collector for the flotation of oxidized ores such as phosphate ore, fluorite ore, scheelite, lead-zinc oxide ore, rare earth ore and so on. Especially for refractory oxidized ores such as carbonate-type apatite ore, fluorite ore and scheelite, selectivity and collecting capacity are very good.
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