Effect of Chloride Salt Ions onto Coal Flotation based on Contact Angle and Bubble-Particle Attachment Time

Öz

This study was aimed to reveal the effect of K+, Na+, Ca2+, and Mg2+ ions on the bubble-particle interactions of high-rank coal with contact angle and bubble-particle attachment time studies. The results for the contact angle experiments indicated that the contact angle of the coal, which was 62° in the absence of ions, increased slightly in the presence of mono- and divalent ions and reached a maximum (67°) in the presence of 1∙10-1 mol/dm3 Mg2+, and the effect of K+ ions on the contact angle was minimal. Furthermore, the results for the bubble-particle attachment time experiments showed that the bubble-particle attachment time of coal, which was measured as 4.5 ms in the absence of ions, decreased as a function of ion concentration from 1∙10-2 mol/dm3 to 1 mol/dm3. While the bubble-particle attachment times of coal particles in the presence of K+/Na+ and Ca2+/Mg2+ at low concentrations were around 2-3 ms and 1-2 ms, respectively, the increase in the concentration slightly changed the attachment time which decreased to less than 1 ms except for K+ ions. Overall, it can be concluded from this study that the effect of these dissolved ions in water was more prominent on the bubble-particle attachment time of the coal particles rather than the contact angle which showed no significant change. Also, the specific ion effect was determined as “Mg2+ > Ca2+ > Na+ > K+” in terms of the bubble-particle interactions in the presence of these ions.

Anahtar Kelimeler

• Chloride Salt Ions
• Coal
• Flotation
• Bubble-Particle Attachment Time
• Contact Angle

Klorür Tuz İyonlarının Temas Açısı ve Kabarcık-Tane Yapışma Süresi Açısından Kömür Flotasyonuna Etkisi

Öz

Bu çalışma, K+, Na+, Ca+2 ve Mg+2 iyonlarının yüksek kaliteli kömürün kabarcık-tane etkileşimleri üzerindeki etkisini, temas açısı ve kabarcık-tane yapışma süresi çalışmaları ile ortaya koymayı amaçlamıştır. Temas açısı deney sonuçları, iyon yokluğunda 62° olan kömürün temas açısının, bir ve iki değerlikli iyonların varlığında hafifçe arttığını, 1∙10-1 mol/dm3 Mg+2 varlığında maksimuma (67°) ulaştığını ve K+ iyonunun temas açısı üzerindeki etkisinin minimum olduğunu göstermiştir. Ayrıca, kabarcık-tane yapışma süresi deney sonuçları, iyon yokluğunda 4,5 ms olarak ölçülen kömürün kabarcık-tane yapışma süresinin, iyon konsantrasyonunun bir fonksiyonu olarak 1∙10-2 mol/dm3 ile 1 mol/dm3 arasında azaldığını göstermiştir. K+/Na+ ve Ca+2/Mg+2 varlığında düşük konsantrasyonlarda kömür tanelerinin kabarcık-tane yapışma süreleri sırasıyla 2-3 ms ve 1-2 ms civarındayken, konsantrasyondaki artış yapışma süresini biraz değiştirmiş ve K+ iyonları hariç 1 ms’nin altına düşürmüştür. Genel olarak, bu çalışmadan, sudaki bu çözünmüş iyonların etkisinin önemli bir değişiklik göstermeyen temas açısından ziyade, kömür tanelerinin kabarcık-tane yapışma süresi üzerinde daha belirgin olduğu sonucuna varılabilir. Ayrıca bu iyonlar varlığında kabarcık-tane etkileşimleri açısından spesifik iyon etkisi “Mg+2 > Ca+2 > Na+ > K+” olarak belirlenmiştir.

Anahtar Kelimeler

• Klorür Tuz İyonları
• Kömür
• Flotasyon
• Kabarcık-Tane Yapışma Süresi
• Temas Açısı

Kaynakça

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