When flotation and beneficiation of spodumene, these influencing factors should be noted!

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Flotation is a commonly used technology for sorting spodumene. Since spodumene in the ore coexists with silicate minerals such as feldspar, quartz and beryl, and has similar surface chemical properties, spodumene and other silicon The sorting of acid salt minerals is more difficult. During the operation, many factors will affect its flotation efficiency. Below we analyze the influencing factors from several aspects.

1. The crushing method affects the various aspects of spodumene. Effect of anisotropy

Different force application methods usually lead to different cleavage and fracture behaviors of spodumene crystal planes. The use of impact crushers in the crushing stage can preferentially produce spodumene cleavage planes. The main reason is that the proportion of surfaces exposed after wet grinding of spodumene is different from that exposed after crushing, and the crushed minerals are more in line with adsorption conditions.

However, studies on different grinding media have found that after wet grinding with iron ball media, the surface elements of the mineral change, especially the hydroxyl complex of iron generated on the surface, which has a greater impact on the adsorption of the collector.

2. Effect of dissolution behavior of mineral surface components on floatability

After spodumene, feldspar and quartz were pre-treated with NaOH and HCl solution stirring respectively, they showed the same characteristics. flotation behavior (in order to eliminate the influence of surface dissolved components, deionized water is used to clean the mineral surface).

After NaOH pretreatment, the flotation recovery rate of spodumene increased significantly, while the flotation recovery rate of feldspar decreased. , the recovery rates of quartz and mica increased slightly. On the contrary, after HCl pretreatment, the flotation recovery rates of spodumene, feldspar and quartz all decreased, among which the flotation recovery rate of spodumene dropped significantly, indicating that the surface properties of the minerals changed significantly after NaOH or HCl pretreatment. Variety.

After spodumene is pretreated in ultrapure water and NaOH solution, the surface components are all dissolved, but the degree of dissolution is different. In the NaOH solution, precipitated materials are formed on the surface of spodumene from the beginning, but the distribution of precipitated materials on the surface is relatively concentrated and disappears quickly, that is, strong dissolution occurs on the surface of spodumene, and as time goes by , the surface is covered with a layer of colloidal material. After being treated with NaOH and cleaned, the Al content on the surface of spodumene is relatively increased, while after being treated with HCl and cleaned, the relative content of Al on the surface is reduced. This shows that the floatability of spodumene increases after the action of NaOH, but the floatability decreases after the action of HCl. It can be seen that by regulating the selective dissolution process of surface components of spodumene and gangue minerals under different pretreatment conditions, the difference in surface properties of spodumene and gangue minerals can be adjusted, and the floatability between minerals can be further expanded. The purpose of sexual difference.

3. Effect of surface component dissolution on spodumene surface properties

In different pretreatment systems, spodumene flotation and mineral processing The different dissolution behaviors of stone surface components have a significant impact on its surface properties. After pretreatment and cleaning with different systems, the contact angle of the surface of spodumene mineral will change. After spodumene is pretreated with deionized water and NaOH solution system, sodium oleate is easily adsorbed on its surface. After the action of chemicals, spodumene The contact angle increased significantly because the Si component on the surface of spodumene was more eroded, which increased the Al active sites acted upon by sodium oleate. On the contrary, after pretreatment with HCl solution, the Al component on the surface of spodumene is more eroded, the active sites are reduced, and the contact angle after interaction with sodium oleate is lower.

The above three effects are analyzed from the perspective of spodumene crystal chemistry, the anisotropy of its cleavage plane and the dissolution characteristics of surface components. No matter which aspect is considered, affecting its flotation efficiency will affect the recovery rate. Before beneficiation, conduct a beneficiation test analysis to determine a reasonable spodumene beneficiation. Processplans, mineral processing equipment and reasonable mineral processing chemicals are necessary.