4 types of scheelite beneficiation technologies

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Tungsten ores can be classified into four categories, namely brine, quartz vein, rock mass and skarn. The beneficiation methods used for these ores are also different. Brine tungsten ores use chemical beneficiation technology, quartz vein tungsten ores use pre-enrichment + gravity separation technology, rock mass tungsten ores use gravity separation + flotation technology, and skarn tungsten ores use flotation + chemical beneficiation. At present, the commonly used methods for recovering tungsten minerals are mainly flotation, gravity separation, magnetic separation and combined beneficiation.

Pre-enrichment can improve the grade of the selected ore and the technical and economic indicators of mineral processing, and reduce the energy consumption of grinding. It is a very important process in the tungsten ore beneficiation process. Gravity separation technology is used for the treatment of coarse and medium-sized tungsten ores, and can effectively separate tungsten minerals and calcium-containing gangue minerals. Magnetic separation technology is mainly used for the roughing and concentrating of tungsten ore, which can separate wolframite and scheelite, and remove magnetic mineral impurities in tungsten ore. Flotation can be divided into caustic soda method, lime method, shear flocculation method, etc., which is the main method for scheelite separation. The following will introduce you to several scheelite beneficiation technologies.

1. Scheelite Gravity Selection Technology

The ratio of scheelite to its gangue minerals is in the range of 2.08-2.78, which is an ore that is easy to reselect. However, the particle size of scheelite ore is fine, and it needs to be ground to 0.2mm to complete the basic monomer dissociation, which will increase the difficulty of reselection recovery. The equipment suitable for reselection of fine-grained materials includes spiral chute, fine mud groove shaking table, etc. Since the spiral chute has a large processing capacity, small footprint, and no power is required, it is the preferred equipment for reselection of scheelite in the ore dressing plant. The purpose of reselection is to discard tailings, reduce the amount of ore for further flotation, and remove calcium-containing gangue minerals to create conditions for selection.

2. Scheelite magnetic separation technology

Since wolframite has weak magnetic properties and scheelite has no magnetic properties, magnetic separation technology can be used to separate wolframite and scheelite. Generally, ore dressing plants will choose magnetic separation technology and flotation technology to separate wolframite and scheelite to improve the recovery rate of concentrate. When there are magnetic minerals such as pyrrhotite and magnetite in the ore, magnetic separation technology can be used to separate these impurity minerals to achieve the purpose of pre-desulfurization and pre-enrichment of scheelite.

3. Scheelite Chemical Separation Technology

Chemical beneficiation technology generally refers to chemical leaching, which is mainly used to treat low-grade tungsten concentrate and middlings, especially for treating fine-grained impregnated refractory ores. The commonly used chemical beneficiation methods for scheelite are hydrochloric acid decomposition method, caustic soda leaching method, soda solution pressure cooking method, fluoride salt decomposition method, etc. Different chemical methods require different process conditions. In order to achieve the appropriate separation effect, it is necessary to control the actual production conditions.

4. Scheelite flotation technology

Scheelite has fine crystal size and good floatability, so flotation technology has become one of the main processes for recovering scheelite. The gravity separation, magnetic separation and chemical separation technology of scheelite sometimes require a combined flotation process to achieve satisfactory beneficiation indicators. The equipment configuration of tungsten ore flotation is simple, the processing capacity is large, and the product quality and concentrate recovery rate are high. However, the deployment of the flotation process should be based on the characteristics of the ore, and the appropriate flotation reagent should be selected to improve the flotation effect.

The above content is a brief introduction to several scheelite beneficiation technologies. Different technologies are used to process different types of scheelite, and other beneficiation technologies need to be combined when necessary to improve beneficiation indicators. Xinhai Mining can provide you with overall beneficiation services for wolframite and scheelite according to the characteristics of the ore, helping you to achieve efficient resource recovery and utilization and improve the overall economic benefits of the beneficiation plant.