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Click to add WeChatMost of my country's scheelite deposits are skarn-type, with finer embedded grains, often associated or symbiotic with a variety of sulfide minerals such as molybdenum and bismuth. According to the different ore types, scheelite can be divided into two categories: scheelite-quartz (or silicate mineral) type and scheelite-calcite-fluorite type. The former is easier to recover, while the latter is more difficult to beneficiate due to its more complex ore properties. This is mainly because the floatability of scheelite and its symbiotic calcium-containing gangue minerals is similar, and tungsten ore is brittle. Therefore, flotation is often used as the main method for separation.
scheelite flotation is roughly divided into two parts: roughing and concentrating. The roughing stage is mainly to maximize the recovery rate of scheelite, while concentrating is the key to obtaining qualified tungsten concentrate. Therefore, in order to obtain qualified tungsten concentrate, the roughing and concentrating processes require strict process flow, and often require multiple concentrating to achieve the expected effect.
The roughing of scheelite is to recover scheelite to the maximum extent. Lime flotation method and sodium carbonate method are commonly used in the roughing stage. Although both are pH adjusters, their principles are different.
Sodium carbonate method: Among them, Na2CO3 can be used as a pH adjuster and a dispersant for the slurry, and can also precipitate metal ions in the slurry that have an adverse effect on flotation, thereby improving the flotation index of tungsten ore.
Lime method: Among them, the role of lime is mainly to use the adsorption of Ca2 on the surface of gangue minerals to change the potential of the surface of gangue minerals, and then add inhibitors such as water glass to inhibit the gangue minerals, thereby achieving the separation of tungsten ore and gangue minerals.
The key to scheelite concentration is to separate tungsten ore and gangue minerals to the greatest extent and improve the grade of tungsten concentrate. The main concentration processes of scheelite after roughing are heating method and normal temperature method.
Heating flotation of scheelite concentrate: It is mostly suitable for mines with high calcium mineral content and low tungsten content. The method mainly refers to the concentration of the concentrate from roughing, the concentration of the concentrated slurry is between 60% and 70%, and then a large amount of water glass is added to it, stirred at high temperature, and finally the slurry is diluted and flotated at room temperature. In this process, different mineral surfaces have different collector film decomposition speeds, so the mineral inhibition is also different, thereby achieving mineral separation. However, since this method requires heating, its working environment temperature is high, the environment is relatively poor, the cost is also high, and its process is relatively complicated and difficult to operate.
Normal temperature flotation of scheelite concentrate: Commonly used for flotation in quartz vein mines, alkaline media (sodium hydroxide, sodium carbonate) are often used to adjust the slurry, metal salts are used as activators, water glass is used as inhibitors, and mixed collectors are used to complete flotation; in addition, water glass can be used in combination with macromolecular organic inhibitors such as baked glue and tannin as combined inhibitors, and mixed collectors can be used to achieve flotation.
The above is an introduction to the two methods of roughing and concentrating in scheelite. In actual ore dressing plants, due to the complex ore properties of scheelite, the processing conditions of each process are different. Therefore, it is recommended to conduct ore dressing tests, and design suitable scheelite ore dressing process plans through experimental analysis to improve its ore dressing efficiency.
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