Potassium feldspar impurity removal process, how much do you know

The methods for removing impurities of potassium feldspar mainly include flotation, magnetic separation, acid leaching process and combined process. The specific process should be based on the occurrence state of impurity minerals and the particle size of the embedded distribution to screen the appropriate impurity removal process.

1. Potassium feldspar magnetic separation impurity removal process

For some weak magnetic impurity minerals such as iron oxide, mica and garnet, it is more suitable to adopt the magnetic separation impurity removal process. The selection of magnetic separation equipment needs to be determined according to the nature of the ore. Commonly used are vertical ring pulsating high-gradient magnetic separator, wet drum magnetic separator, flat plate magnetic separator, etc.

The magnetic separation effect of potassium feldspar is mainly affected by the magnetic field strength of the magnetic separation equipment and the number of magnetic separations. Generally, the higher the magnetic field intensity, the more magnetic separation times, the less iron content in ore, and the pulsating current can also improve the iron removal effect.

2. Potassium feldspar flotation impurity removal process

When the iron-containing impurities in potassium feldspar exist in the form of iron-containing alkali metal silicate minerals such as sulfide minerals, mica minerals, and silicate minerals, the flotation method is often used to remove impurities. The conditions for flotation to remove impurities are divided into:

① For sulfide minerals, under the natural pH condition of the pulp, use xanthate collectors to remove them by flotation;

② For mica minerals, it can be realized in the amine collector system with a pulp pH of 2.5-3.5;

③ For silicate minerals, when the pH of the pulp is 3-4, sulfonate collectors can be selected to float.

3. Potassium feldspar acid leaching and impurity removal process

The acid leaching impurity removal process uses acids to selectively dissolve iron-containing minerals in potassium feldspar, and is an effective method for treating impurities in potassium feldspar with extremely fine embedded crystal structures. Commonly used acids are hydrofluoric acid, hydrochloric acid, sulfuric acid, nitric acid, oxalic acid, etc. Among them, oxalic acid has strong acidity, stronger reducibility than other inorganic acids, and good complexing ability. It is currently an effective organic acid for dissolving iron oxides. It is widely used in potassium feldspar to remove iron. It dissolves hematite slowly, but Iron hydroxides such as goethite and lepidosite are easy to dissolve, and the iron removal rate can be as high as 90%.

4. Potassium feldspar combined impurity removal process

For some refractory potassium feldspar ores, not only the iron content is high, but also some impurities in the potassium feldspar cleavage gap in the form of iron staining, when the single separation process cannot meet the concentrate requirements, a combined impurity removal process should be adopted , such as acid leaching-flotation combined process, flotation-magnetic separation combined process, scrubbing-magnetic separation-flotation combined process, desliming-strong magnetic-acid leaching combined process, etc.