Feldspar is a kind of silicate minerals which contains calcium, sodium and potassium, there are many categories of Feldspar including albite, anorthite, etc. Feldspar mining process mainly applying flotation process, and Feldspar mining machines mainly including jaw crusher, ball mill, spiral chute, and concentrating table, etc.
Feldspar ore is the main source of feldspar mineral concentrate or purified feldspar used in the manufacture of various grades of glass and ceramics including high-end ceramics and electronic-grade glass fibers. The glass and ceramic industries, in particular, are major consumers of feldspar, accounting for 95% of total consumption.
In recent times, the increasing rate of depletion of high-grade feldspar ores has resulted in lower-grade ores becoming the primary source of feldspar. This has placed added pressure on producers to further optimize existing feldspar processing methods like flotation to more efficiently produce higher grades of feldspar for the specialty glass, ceramics and electronics markets.
Process Description
Conventional open-pit mining methods including removal of overburden, drilling and blasting, loading, and transport by trucks are used to mine ores containing feldspar. A froth flotation process is used for most feldspar ore beneficiation.
An amine collector that floats off and removes mica is used in the first flotation step. Also, sulfuricacid, pine oil, and fuel oil are added. After the feed is dewatered in a classifier or cyclone to remove reagents,sulfuric acid is added to lower the pH. Petroleum sulfonate (mahogany soap) is used to remove iron-bearingminerals.
To finish the flotation process, the discharge from the second flotation step is dewatered again, and a cationic amine is used for collection as the feldspar is floated away from quartz in an environment of hydrofluoric acid (pH of 2.5 to 3.0).
If feldspathic sand is the raw material, no size reduction may be required. Also, if little or no mica is present, the first flotation step may be bypassed. Sometimes the final flotation stage is omitted, leaving a feldspar-silica mixture (often referred to as sandspar), which is usually used in glassmaking.
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