Kolon Flotasyonunda Hava Hızının Su ile Taşınıma Etkisi

Öz

Hidrofilik tanelerin konsantreye gelmesinde önemli rol oynayan su ile taşınım, kolon içerinde tabandan yukarı yükselen hava kabarcığının arkasında veya çevresinde su ile ya da köpük ara yüzeyinde yukarı doğru hareket eden hava kabarcıkları tarafından ince tanelerin itilerek köpük fazı içine taşınması olayıdır.

Bu çalışmada, 5 cm çapında 75 cm yüksekliğinde dairesel kesitli kolon hücresi kullanılmıştır. Yüksek saflıktaki kalsit (%97,78 CaCO₃) ve sölestit (%97,20 SrSO₄) minerallerinin karışımı (1:1 oranında) ile değişen hava kabarcığı hızlarında kalsit, sölestit ve su verimi değerleri hesaplanmış, Kirjevainen Modeli (1989) kullanılarak kalsit için su ile taşınım faktörü (Pi) elde edilmiştir. Kolon hücresi ile 1 cm/sn hava hızlarında 4. dakika kalma süresinde konsantrede yüksek verim ve seçimlilik değerine ulaşılmış ve en düşük su ile taşınım faktörü (Pi: 0,365) elde edilmiştir.

Anahtar Kelimeler

• Sölestit,kalsit,su ile taşınım,kolon flotasyonu

Influence of Superficial Air Rate on Entrainment in Column Flotation

Abstract

Entrainment, which is play an important role in the water-entrained concentration of hydrophilic particles, takes place behind or round the uprising air bubbles, through the pushing of the water or the uprising bubbles the entrainment of fine particles at the bubble interface.

In this study, a column cell with a height of 75 cm, diameter of 5 cm and circular cross-section was used in our experiments. Calcite, sölestit and water recovery were calculated with a mixture (1: 1 ratio) of artificial minerals of high purity calcite (97,78% CaCO₃) and celestite (97,20% SrSO₄) at different superficial air rates. The results showed that the superficial air rate had significant effect on the grade and recovery, flotation time, and fine gangue entrainment. When the superficial air rate (1 cm/sec.) were used, high recovery and selectivity values ​​were reached in column flotation (4th minute residence time) and entrainment factor was calculated the lowest (Pi: 0,365). The superficial air rate also influenced flotation rate and recovery of celestite particles to a great extent. Kirjaveinen (1989) model was used for describing a specific entrained factor (Pi) of hydrophilic particles in this study.

Keywords

• Celestite,calcite,entrainment,column flotation

Kaynakça

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