SELECTIVE SEPARATION OF Na- AND K-FELDSPAR FROM WEATHERED GRANITES BY FLOTATION IN HF MEDIUM


Demir C.

CERAMICS-SILIKATY, cilt.54, sa.1, ss.60-64, 2010 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 54 Konu: 1
  • Basım Tarihi: 2010
  • Dergi Adı: CERAMICS-SILIKATY
  • Sayfa Sayıları: ss.60-64

Özet

Granite and granodiorite deposits are widely scattered throughout in Eastern Black Sea region of Turkey. These granitic bodies also contain considerable amounts of quartz, Na-feldspar, K-feldspar mica and other color-imparting ferruginous impurities. Average chemical composition of these rocks are SiO(2) = 65.00 +/- 5.60; K(2)O = 3.05 +/- 1.35; Na(2)O = 3.50 +/- 1.47 %. Modally, these rocks contain 21.5 +/- 5.2 quartz; 19.3 +/- 4.8 K-feldspar and 48.3 +/- 10.2 % plagioclase. Although the chemical composition of these run-of-mine granite masses cannot meet the specifications required for the glass and ceramic industry, application of some mineral processing methods may recover quartz, Na-feldspar and K-feldspar as separate products. This study deals with the selective separation of sodium feldspar from potassium feldspar from weathered granite using cationic flotation technique (HF + amine) in the presence of NaCl. The most striking result in this experimental study is the depressive effect of NaCl on Na-feldspar NaCl addition controls amine adsorption on sodium feldspar through adsorption of Na(+) ions onto mineral surfaces. The use of NaCl in flotation was found to increase the K-feldspar grade in the concentrate. This study clearly demonstrates that an effective separation of sodium feldspar from potassium feldspar from a weathered granite can be achieved by cationic flotation in HF medium using NaCl as a depressant.