Feldspar Ore Iron Removal Process

(1) Ore crushing

The crushing process of feldspar ore includes crushing and grinding. On the one hand, the crushing of feldspar is to meet the particle size requirements of the final product, and on the other hand, it is also the need for the impurity removal process. At present, feldspar grinding is mainly divided into two methods: dry method and wet method. The wet grinding method is more efficient than the dry method and is less prone to “over-grinding”. Most feldspar processing in the glass industry uses steel rod media grinding, which has high grinding efficiency and uniform particle size, but is contaminated by iron, resulting in low quality feldspar; in the ceramics industry, stone wheel grinding or porcelain ball grinding is used, which has low grinding efficiency. Low, high energy consumption. On the basis of ensuring the high quality of feldspar products, achieving high-efficiency grinding and continuous production is an important topic in the research on feldspar processing and purification.

(2) Ore washing and desliming

Ore washing is suitable for feldspar produced from weathered granite or feldspar placer. It mainly removes impurities such as clay, fine mud and mica, which can reduce the Fe2O3 content in the feldspar ore and increase the potassium and sodium in the feldspar ore. content. The ore washing process often uses a vibrating screen or a washing tank, which uses clay, fine mud, and mica with small particle sizes or low sedimentation speeds (light specific gravity) to easily separate from coarse-grained feldspar under the action of water flow.

Desliming is mainly to remove the primary slime in the ore and the secondary slime produced by grinding, etc., to prevent a large amount of fine slime from affecting the separation effect of subsequent operations (such as flotation, magnetic separation, etc.). It is usually deslimed in a single or composite force field. Commonly used equipment includes desludging buckets, centrifuges, hydrocyclones, etc. In addition, amine collectors are very sensitive to mineral mud. RNH3+ is easily adsorbed on the surface of negatively charged slime particles, which not only consumes a large amount of collector, but also often causes a large amount of sticky foam, making the process lose selectivity and reducing the flotation effect. Therefore, when using amine collectors, the flotation slurry needs to be deslimed in advance.

(3) Magnetic separation

Since the iron minerals, biotite, hornblende and tourmaline in feldspar all have certain magnetic properties, they can be separated from feldspar under the action of an external magnetic field. Generally, the magnetism of these minerals in feldspar is weak, and only strong magnetic separation equipment can be used to obtain better sorting results.

At present, the domestic magnetic separation equipment used to remove iron from feldspar mainly includes: permanent magnet roller type strong magnetic separator, permanent magnet cylinder type medium strong magnetic field magnetic separator, electromagnetic flat ring strong magnetic separator, electromagnetic induction roller type strong magnetic separator Separator, high gradient magnetic separator and superconducting magnetic separator.

(4) Flotation

Flotation is an effective way to beneficiate and purify feldspar. On the one hand, flotation can remove iron and titanium minerals in the ore. Reverse flotation is generally used to remove iron and titanium minerals. On the other hand, flotation can achieve the separation of feldspar and quartz. , to further purify the feldspar mineral.