Limonite beneficiation process

Enhanced desliming-reverse flotation

Limonite is very easy to mud, which will seriously affect the flotation effect. Therefore, before reverse flotation, the limonite can be enhanced desliming or Strengthen the dispersion of sludge operations. Reverse flotation is mainly responsible for upgrading limonite and reducing impurities. However, because the limonite particles are loosely crystallized and have a large specific surface area, it is easy to adsorb and consume a large amount of chemicals during the flotation process. Therefore, it is advisable to use multiple small amounts of dosing and multiple dosages. Secondary selection of other flotation processes.

However, due to the loose crystallization of limonite particles and large specific surface area, it is easy to absorb and consume a large amount of chemicals during the flotation process. Therefore, it is advisable to use multiple small amounts of chemicals added and multiple selections of other flotation processes. .

Stage grinding-reverse flotation

This process is mainly suitable for processing limonite ore that has a close symbiosis between iron-containing minerals and gangue minerals and has finer particle size. , in the case of coarse grinding, a part of the qualified concentrate can be obtained, while the limonite minerals remaining in the rich tailings need to be recycled through the regrinding-reverse flotation process.

Since limonite ore has the characteristics of complex ore structure, finer particle size and large mud and water content, the reverse flotation process can be used to increase iron and reduce silicon to achieve better separation results.

Enhanced dispersion-strong magnetic separation

Suitable for processing limonite ore with large magnetic differences between ore and gangue ore. The process is: during the grinding process of raw ore, add Dispersants such as sodium carbonate and water glass strengthen the dispersion of the slurry and achieve separation; limonite with weak and medium magnetic properties can be recovered by a strong magnetic separation process, but it is still important to strengthen the dispersion of the slurry before magnetic separation.

Enhanced classification-coarse-grained magnetic separation-fine-grained flocculation magnetic separation

It is mainly suitable for low-grade fine-grained limonite. This process can better recover the materials in the grinding mill. The fine-grained iron minerals muddied during the mining process improve the recovery rate of the concentrate. The key lies in selective dispersion, flocculation condition control and magnetic separator separation conditions (such as ore feed concentration, magnetic field strength and flushing water, etc.) .

Gravity separation-strong magnetic separation-oxidation roasting-weak magnetic separation

Suitable for processing ores containing harmful impurities such as sulfur, phosphorus, lead, zinc and other compounds in limonite. With the reduction roasting method, the impurity content in the iron concentrate is still relatively high. Therefore, adding other agents (such as chlorinating agents) during the reduction roasting process can reduce the content of harmful impurities and obtain qualified iron ore concentrate.

Strengthened classification-gravity-reverse flotation

Limonite is a mineral that is prone to mudification, and mudification will occur during crushing, grinding, transportation and stirring. Iron-containing minerals and gangue minerals have a close symbiotic relationship, and dissociation of the monomers will inevitably lead to over-grinding and fine mud formation. Strengthening the classification-gravity-reverse flotation process can overcome the current problems of limonite beneficiation and grinding fineness, large metal loss during desliming, and low concentrate grade.

The above is an introduction to several common limonite beneficiation methods. In the actual beneficiation plant, the specific one to choose depends on the properties of limonite.