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Click to add WeChatLithium is one of the important raw materials for new energy, and its effective development is necessary. So this article will mainly introduce several methods of lithium ore extraction. The current lithium ore beneficiation methods in Changjiang are hand separation, flotation, heavy media separation and combined beneficiation. The specific choice of process method depends on the actual situation.
(picture from the Internet)
Hand The selection method can be used in the preliminary screening operation of lithium ore. According to the differences in color, appearance and gloss between lithium ore and gangue, waste rocks are manually sorted out to improve the grade of lithium ore in subsequent separation operations. In lithium ore beneficiation, manual separation is often used to sort coarse-grained crystalline lithium ore. Generally, the particle size of the ore is required to be between 10-25mm and the width should not be greater than 1200mm. It is appropriate to manually select the belt speed to be controlled at 0.2~0.4 m/s.
Flotation method is currently the main lithium ore separation method. All lithium ores with industrial value can be enriched through flotation method. , especially lithium ore that exists in fine-grained disseminated form. Common lithium ore flotation methods include forward flotation and reverse flotation.
Positive flotation:The positive flotation method of lithium ore means that after the lithium ore is ground (try to avoid over-grinding, which may cause Mudification phenomenon), add strong alkali for flotation. After desludging with high concentration, strong stirring, and multiple scrubbings in an alkaline medium, oleic acid and its soap salts are added as collectors to directly float out the lithium concentrate, leaving gangue minerals in the tank. No addition is needed in this process. Inhibitors.
Reverse flotation:The lithium ore reverse flotation method refers to using lime to create an alkaline environment, adding starch, dextrin, etc. to inhibit the floating of lithium ore, and at the same time using cation collectors to The silicate gangue minerals float to the surface of the slurry, and the product in the flotation machine tank is lithium concentrate. If lithium ore contains iron minerals, a foaming agent (such as HF, resinate) can be added to further help remove iron minerals and other impurities.
Generally speaking, the difference in specific gravity between lithium minerals and gangue minerals is not greater than 0.2-0.5g/m3< /sup>, not suitable for reselection with shakers or jigs. Therefore, heavy media beneficiation method can be used to make lithium ore into heavy mineral products, while gangue minerals are light products. Mix the washed and deslimed lithium ore with heavy medium (heavy medium includes heavy liquid and heavy suspension, here mainly refers to heavy suspension), and feed it into the heavy medium cyclone at a pressure of 0.05-0.20Mpa for selection. In addition, heavy products and light products can be separated. The heavy product becomes lithium concentrate after demediation through demediation screen, and the light product becomes tailings after demediation through demediation screen. Its main components are quartz, feldspar, biotite and other gangue minerals.
In nature, lithium ore is often associated with complex components, so it is sometimes difficult to obtain qualified lithium concentrate using a single beneficiation method. If necessary, Use combined processes for separation, such as: flotation-magnetic separation process, flotation-gravity separation-magnetic separation process, flotation-chemical treatment process, etc.
Take the flotation-magnetic separation process as an example. The lithium concentrate obtained by the flotation method sometimes contains more iron. In order to obtain low-iron spodumene and improve the product grade of spodumene concentrate, magnetic separation can be used as an auxiliary measure to improve the quality of lithium concentrate. Commonly used magnetic separation equipment include vertical ring pulsating high gradient magnetic separator and wet type Strong magnetic separator.
The above four methods are common methods for selecting lithium. Each method has its own advantages and mineral processing conditions. The specific process to choose depends on the ore properties and processing capacity of the lithium ore. . Therefore, it is recommended to design reasonable mineral processing methods and customize suitable Lithium Ore Processing Equipment.
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