Feldspar is an aluminosilicate mineral of a framework structure of alkali metal or alkaline earth metal such as potassium, sodium, calcium and a small amount of cerium, and its main components are SiO2, Al2O3, K2O, Na2O, CaO and BaO.
Feldspar is an important raw material for ceramics, glass and other manufacturing industries. As glass and ceramic products become more and more high-grade, the demand for high-purity and low-iron feldspar raw materials continues to expand. Although feldspar resources are abundant, it is mainly based on potassium feldspar, which generally has a high iron content. At the same time, the feldspar mine contains a certain amount of quartz impurities, which must be applied after iron removal and purification.
The main harmful minerals found in K-feldspar are iron minerals. Other impurity minerals include clay, mica, garnet, tourmaline, chlorite, and quartz.
Different types of K-feldspar, due to the occurrence of impurities such as iron and titanium, the size of the inlay and the interaction between minerals, the methods and effects of beneficiation whitening are also different. According to the ore properties of the feldspar mine, the following four mineral processing principles are generally adopted:
(1) High-quality feldspar produced in pegmatite: Hand selection--Crushing--Grinding (or water-milling)--Grading.
(2) Feldspar in weathered granite: Crushing--Grinding--Grading--Flotation (except iron, mica)-Flotation (quartz, feldspar separation).
(3) Feldspar in fine-grained rock (generally containing mica, sometimes containing iron): Crushing--Grinding--Screening--Magnetic separation.
(4) Feldspar sand mine: Water-eluting mud--Screening (or flotation separation of quartz, etc.).
In recent years, with the reduction of feldspar resources and the decline of quality, the requirements for product quality have been continuously improved, and the development of comprehensive utilization of mines has introduced more complicated sorting operations such as re-election, flotation, and high-gradient magnetic separation. Thereby the purpose of removing quartz, mica and iron-containing titanium minerals is achieved.
Main Feldspar Processing Machines: