Flotation is an effective method to remove impurities in feldspar. On the one hand, impurity elements such as iron and titanium can be removed from feldspar, and the combination of chemical agents depends on the existing composition of impurities; on the other hand, feldspar can be precipitated from quartz, thereby increasing the content of potassium and sodium.
At present, there are many studies on the separation of feldspar and quartz, and the selective separation of potassium feldspar and albite.
The flotation results show that titanium mainly exists in rutile (or anatase) and a small amount of titanium. With fatty acids as collectors, rutile (or anatase) is easily floated at pH 4-6, but its floatability decreases in the following order: oleic acid, linoleic acid, and linolenic acid.
Rutile (or anatase) can also float at Ph 2.5 using petroleum sulfonates or aliphatic primary amine acetates. Currently, only a few literatures describe its flotation performance.
Flotation of iron-bearing gangue minerals
Generally speaking, the iron element in feldspar mainly exists in mica, pyrite, hematite and metal silicate containing iron alkali. Under normal circumstances, mica can be floated by amine cation collectors at pH 2.5-3.5; xanthate collectors can float sulfide minerals such as pyrite at pH 5-6; iron-containing silicates can be Ph 3-4 were obtained by flotation with sulfonate collectors.
Quartz feldspar flotation separation of quartz feldspar
The flotation separation method is the hydrofluoric acid method. Considering environmental protection, most prefer the free fluoric acid method.
Magnetic flotation of feldspar beneficiation process
At present, the combined process is easy to obtain high-grade concentrate, and it is economical and effective to use acid leaching extraction to pretreat feldspar ore with high iron content.
It is difficult to remove iron-bearing minerals from ultra-fine feldspar particles by traditional methods, but leaching can achieve better results. The feldspar leaching agent is not only beneficial to the decomposition of feldspar, but also can effectively remove the interlayer iron minerals on the surface of the feldspar.
Bioleaching has the advantages of simple operation and less environmental pollution.
For some difficult-to-separate feldspars with high iron content, some iron minerals are infiltrated in feldspar cleavage, and the single-selection separation process cannot meet the requirements of concentrates, and multi-stage assemblages are introduced in a timely manner.
(1) Maglev combined flow
Most of the iron minerals are removed by magnetic separation, and then fine iron minerals and iron-dyed potassium feldspar are removed by flotation. Flotation after dry magnetic separation can achieve the best separation effect, but dry magnetic separation requires dehydration and drying process, and the cost is high, so the flotation process after wet magnetic separation is more widely used.
(2) Combination process of peeling-strong magnetic separation process
If the feldspar ore is soft and easy to break, put it in a pulverizer to strip the iron from the mica group of minerals. The results show that the stripping-intensive magnetic separation process is significantly improved, and the cost is lower than the combined magnetic-flotation process.
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