Magnetic separation flotation process of spodumene

15311826613

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Lithium has been applied in many fields, such as metallurgy, aviation, aerospace, etc., especially in the application of lithium batteries and controlled thermonuclear fusion reactors, so the current global demand for lithium metal is very urgent. Lithium minerals in nature mainly exist in the form of spodumene, lepidolite  and diathlidene . Spodumene is one of the more widely developed and used minerals, enjoying the laudatory name of " industrial MSG ". Because spodumene is often symbiosis with gangue minerals such as quartz, feldspar, mica, it will cause more slime of spodumene minerals, thus affecting the dressing effect of spodumene and improving its dressing difficulty.

Flotation method is currently commonly used for spodumene, generally need to add into the pulp "three alkali, two soap " to improve the collection ability of target minerals. The common flotation process of spodumene in the concentrator is mainly one rough, two sweeping, two fine , and the middle ore obtained in the process returns to the closed circuit process, and the desliming before flotation is very necessary. The return processing of medium ore will affect the stability of roughing beneficiation, the concrete operation is not strong, the applicability is limited, so the beneficiation index is not ideal. In order to overcome the existing technology problems, the following will introduce a spodumene magnetic flotation combined beneficiation process , This process is stable, has strong applicability, and has ideal concentrate taste and recovery rate.

First, spodumene maglev joint process flow

The combined process of spodumene maglev is roughly as follows: The raw spodumene ore is broken , grinding , and the pulp after grinding is successively weak magnetic separation , strong magnetic separation to obtain weak magnetic concentrate and strong magnetic concentrate. After the strong magnetic tailings are concentrated and deslimed , they enter the flotation operation, and the treated tailings are lithium concentrate.

spoxene grinding - grading operation: Raw ore enters the crusher for coarse crushing, medium crushing and fine crushing after grinding, grinding operation and grading operation often form a closed loop, thereby improving the utilization rate of ore.

spodumene weak magnetic - strong magnetic separation operation: The product after grinding classification enters the magnetic separator for weak magnetic separation and strong magnetic separation to obtain weak magnetic concentrate and strong magnetic concentrate. Low magnetic separation can be used permanent magnet drum magnetic separator , the magnetic field intensity is set at 150 ~ 175kA/m. When the mineral is strongly magnetic separation, the high gradient magnetic separator is selected, and the magnetic field strength is generally 770 ~ 950kA/m. The low intensity magnetic concentrate can further recover the iron-bearing minerals in it, and the high intensity magnetic concentrate can obtain tantalum niobium and other elements by gravity separation.

Concentrate concentration and desliming operation: This process is only for strong magnetic separation tailings, and the concentration of bottom flow slurry after concentration and desliming ranges from 32% to 38%.

spodumene flotation operation: When the concentration and desliming bottom flow concentration meets the requirements, it is fed into the flotation operation. The flotation process is one rough selection, two sweep selection, two select . After flotation, lithium concentrate is obtained and tailings are discharged. The collector used in flotation is a combination collector of fatty acid calcium, hydroxylamine compounds and oleic acid, and the adjustment agent used in roughing is sodium carbonate, sodium hydroxide and calcium chloride.

Second, spodumene maglev combined process advantages

1. The medium ore produced in the flotation process adopted by this process does not need to be returned to roughing, the flotation process is more stable, and the beneficiation index is good.

2. The use of weak magnetic and strong magnetic separation can further recover valuable elements in minerals, such as the recovery of iron minerals in weak magnetic concentrate and the recovery of tantalum niobium elements in strong magnetic concentrate.

3, the use of compound collector can play a synergistic effect between various agents, learn from each other. The composite collector has the advantages of good selectivity and strong collecting ability.

4, the process is simple, stable and reliable, and the flotation reagent used is environmentally friendly. In addition, the grade and recovery of spodumene concentrate obtained are high.

The above is a simple introduction to a spodumene magnetic flotation combined beneficiation process and advantages. The optimization of the specific process flow and the setting of the beneficiation equipment should be determined according to the ore characteristics and production requirements. Xinhai proposed to carry out beneficiation test analysis to determine the ore composition, customize and design a reasonable lithium pyroxene beneficiation process according to the test results, and obtain good beneficiation index economic benefits.