Highlights of Feldspar Ore Dressing Technology

In industrial applications, feldspar ore often contains a variety of impurities and can not be used directly, need to be separated from other minerals to remove impurities. The impurities in feldspar ore are various, and the harmful impurity elements are mainly iron and titanium, and the harmful impurity minerals include quartz, clay minerals, mica, rutile, etc. In the process of removing impurities, hand separation, washing and desliming are the common roughing methods.

In the removal of impurities in the process method, hand-selecting, washing and desliming are commonly used roughing means. Part of the crystalline feldspar ore impurities are mainly massive mica and quartz, which can be removed by hand separation; photometric ore sorting machine can also replace the hand separation, based on the difference in light reflection characteristics of the ore for sorting. Feldspar ore from feldspathic sandstone or weathered granite can be washed to remove impurities such as clay, mica, and fines, based on the principle that different minerals with different particle sizes and specific gravity can be separated under the action of water flow. In addition, desliming for feldspar ore beneficiation is also very critical, can remove the primary and secondary sludge affecting the effect of beneficiation, commonly used centrifuges, desliming hoppers and other equipment.

Magnetic separation is the use of feldspar ore containing iron minerals, garnet, etc. has a certain magnetic characteristics, in the role of the applied magnetic field to remove impurities. Due to the weak magnetic properties of these minerals, often need strong magnetic separation equipment, including permanent magnetic cylinder magnetic separator and other types of strong magnetic field. Selection of magnetic separation equipment should take into account the characteristics of feldspar ore, process flow and other factors, such as priority selection of permanent magnetic separator, first weak magnetic separation after strong magnetic separation.

Flotation is widely used in feldspar ore removal. Feldspar and mica separation generally use reverse flotation method, mica coarse grinding, dodecylamine and other cationic collectors in acidic conditions flotation; feldspar and quartz separation through the fluorine acid method, non-fluorine acid method, non-fluorine acid method, etc., the current acid flotation feldspar method is most widely used, but there are corrosion problems of the equipment; feldspar and iron-containing minerals need to be separated according to the different types of iron-containing minerals in a specific pH conditions, choose the yellow drug class, Amines and other trappers; feldspar and titanium-containing minerals separation, rutile can be used under different pH values of fatty acids and other trappers flotation, titanite flotation is relatively complex and sensitive to sludge.

For feldspar ores containing iron impurities with very fine embedded crystal structure, acid leaching can achieve better results, and increasing the acid leaching temperature, sulphuric acid concentration and prolonging the time can enhance the effect of iron removal. Bio-leaching is mainly for feldspar fine particles of iron-containing minerals, the use of microorganisms and iron-containing minerals oxidation, reduction reaction, so that the dissolution of iron ions, and then wash to remove impurities, the method of environmental pollution is small, the operation is simple, but the domestic research is less.

When a single beneficiation method is difficult to meet the requirements, it is necessary to use a joint process, such as ‘magnetic separation a flotation’ ‘reverse flotation a strong magnetic separation’ and so on. Specific process according to the characteristics of feldspar ore and the impurity content of the precision requirements of the choice, practice has proved that the joint process can achieve better results in removing impurities.