Positive flotation beneficiation process for bauxite

Positive flotation beneficiation process for bauxite

For low-grade bauxite raw ore (aluminum silicon ratio 3-4), the original selective grinding agglomeration flotation method is difficult to meet the requirements, and flotation desilication has gradually become a research focus; At present, flotation is divided into two types of flotation processes: positive flotation and reverse flotation.

Bauxite positive flotation beneficiation process flow

1.Ore preparation:

  • The raw ore undergoes coarse and fine crushing to a certain particle size for subsequent flotation treatment.
  • The ore is dried to remove moisture and improve flotation efficiency.

2.Medication preparation:

  • Flotation reagents include collectors, foaming agents, and adjusters. The collector is used to selectively adsorb on the surface of aluminum minerals, the foaming agent is used to generate foam, and the regulator is used to adjust the pH of pulp and the surface properties of minerals.

3.Flotation machine separation:

  • The slurry is fed into the flotation machine, where aluminum and silicon minerals in the slurry are separated under the action of reagents.
  • Due to the role of collectors, aluminum minerals selectively adsorb on bubbles and float to the pulp surface to form a foam layer.
  • Silicon minerals and impurities remain in the slurry and are not subjected to flotation.

4. foam collection:

  • The aluminum minerals in the flotation foam layer are collected to form bauxite concentrate.
  • The collected foam is dehydrated to obtain a high grade bauxite concentrate containing a certain amount of water.

5.Concentrate Treatment:

  • The concentrate is dried to remove moisture and obtain a dry bauxite concentrate.
  • Concentrates can also be further processed, such as calcination, electrolysis, etc., to extract aluminum metal.

Technological advantages

  • Efficient Separation: The positive flotation process can effectively separate aluminum and silicon minerals in bauxite, improving the recovery rate of aluminum.
  • Reagent optimization:By optimizing the selection and use of flotation reagents, flotation efficiency can be improved and reagent costs can be reduced.
  • Flexible operation:The positive flotation process is flexible and can adjust flotation conditions according to the properties and needs of the ore to achieve the best flotation effect.
  • The positive flotation process of bauxite separates aluminum and silicon minerals from bauxite through flotation, which has the advantages of efficient separation, optimization of reagents, and flexible operation. This process plays an important role in bauxite beneficiation, providing effective technical support for the processing and utilization of bauxite.

Typical beneficiation plant

Henan Zhongzhou Aluminum Plant: In the raw ore, diaspore is the main useful mineral, while gangue is mainly illite, kaolinite, pyroxene, and chlorite. Iron minerals mainly include rutile, goethite, hematite, etc; Flotation of diaspore with anionic collectors, dispersion of slurry with sodium hexametaphosphate, and inhibition of silicate minerals.