Jan 01, 2018 Our flotation cell is built of borosilicate glass, is designed for up to 90?g of sample material with grain sizes between 250–1000? m, and achieves quartz and feldspar separation in =2?h. The operation procedure uses air bubbles to which the feldspars attach, 0.2% HF to reduce the surface energy of quartz, dodecylamine solution as a feldspar collector, and operates at a pH range of 2.4–2.7