(中南大學 資源加工與生物工程學院，長沙 410083)
摘 要: 選用非極性基結構不同的起泡劑MIBC和BK-201，利用自制的泡沫性能測試系統(tǒng)，在兩相泡沫體系下，測定兩相泡沫不同高度處的氣泡直徑、靜壓強、表觀溢流速度，研究起泡劑對泡沫特征及夾帶的影響。結果表明：增加起泡劑濃度，氣泡的兼并行為受到抑制，氣泡直徑逐漸減小；當MIBC濃度超過75 mg/L、BK-201濃度超過150 mg/L時，兼并行為受到顯著抑制，氣泡直徑基本保持不變。在相同的濃度下，相比MIBC，BK-201產(chǎn)生的泡沫氣泡直徑大、含液率低、水回收速率低。因而，微細粒脈石在BK-201所形成泡沫中夾帶更弱，浮選選擇性更好。
關鍵字: 起泡劑；泡沫柱；兩相泡沫；泡沫特征；泡沫夾帶
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:By using self-designed foam property testing system, two nonpolar base structure frothers, MIBC and BK-201 were chosen to study the influences of frothers on the foam characteristic and entrainment by measuring the bubble diameter, static pressure and apparent flooding velocity in the two-phase foam. The results show that bubble merger degree reduces and air bubble diameter decreases with increasing frothers concentration. When the concentrations of MIBC and BK-201 are more than 75 and 150 mg/L, respectively, the air bubble diameter basically remains unchanged because the merger behavior is dramatically depressed. Under the same concentration, BK-201 generates larger diameter bubble, lower liquid holdup and lower water recovery compared with MIBC. As a result, the foam entrainment of fine gangue is weaker and the selectivity of flotation is better when BK-201 is used.
Key words: frother; froth column; two-phase foam; froth characteristic; froth entrainment
