(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 為了改善油酸鈉在低溫條件下的捕收性能，通過單礦物浮選試驗研究油酸鈉體系下不同結(jié)構(gòu)的脂肪醇聚氧乙烯醚對白鎢礦低溫浮選行為的影響，并應(yīng)用于白鎢礦低溫浮選實踐中。結(jié)果表明：油酸鈉在低溫條件下對白鎢礦的捕收能力很差，試驗用各脂肪醇聚氧乙烯醚對油酸鈉的捕收性能均有不同程度的改善，當pH=10、油酸鈉用量為60 mg/L時，白鎢礦在10 ℃時的浮選回收率僅僅為20%；而當油酸鈉與聚氧乙烯醚按照質(zhì)量比5:1混合使用時，相同油酸鈉濃度下白鎢礦的浮選回收率最高可達85%，可浮性大大提高。此外，聚氧乙烯醚對油酸鈉低溫捕收性能的增效程度與其結(jié)構(gòu)密切相關(guān)，當疏水基的碳原子個數(shù)小于14，且親水親油平衡值(HLB)為13~16時，增效效果顯著；當HLB值相近時，含支鏈的聚氧乙烯醚比直鏈聚氧乙烯醚增效效果好。實際礦石浮選試驗表明：MOA-9可以有效提高白鎢礦在低溫下的可浮性，大大降低捕收劑用量。
關(guān)鍵字: 白鎢礦；油酸鈉；聚氧乙烯醚；復(fù)配體系；低溫浮選
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:In order to improve the collecting performance of sodium oleate at low temperatures, the effect of a series of fatty alcohol-polyoxyethylene ether with different structures on flotation behavior of scheelite were investigated by single mineral flotation experiments and sucessfully applied in low-temperature flotation practice. The results show that sodium oleate has poor collecting capability to scheelite at low temperature, and all the polyoxyethylene ethers used have varying improvements. When sodium oleate concentration is 60 mg/L at pH=10, the flotation recovery of scheelite at 10 ℃ is only 20%. However, when sodium oleate and polyoxyethylene ether are mixed used with the mass ratio of 5:1, the flotation recovery of scheelite can reach a maximum value of 85%, the floatability greatly increases. In addition, the synergistic degree of polyoxyethylene ether to sodium oleate is closely related to the structure. When the number of carbon atoms in the hydrophobic group is less than 14, and the hydrophile-lipophile balance number (HLB) value is in the range of 13-16, the synergistic effect is remarkable. When the HLB value is close, the synergistic effect of branched polyoxyethylene ether is better than that of linear one. The real ore flotation experimental results show that MOA-9 can effectively increase the floatability of scheelite at low temperature, and significantly decrease the collector dosage, the synergistic effect is remarkable.
Key words: scheelite; sodium oleate; polyoxyethylene ether; compound system; low-temperature flotation
