(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 通過浮選實驗、溶液化學(xué)計算及紅外光譜測試，研究油酸鈉在赤鐵礦和磷灰石表面吸附及其對浮選的影響。結(jié)果表明：赤鐵礦在pH為7~10內(nèi)有較好的可浮性，磷灰石在pH為3~12內(nèi)都保持較好的可浮性。堿性條件下，磷灰石表面的Ca2+為礦物表面的活性吸附點，能與油酸鈉發(fā)生化學(xué)作用形成油酸鹽；在弱堿性條件下，對赤鐵礦浮選起主導(dǎo)作用的是離子−分子締合物；pH為11.5的條件下，經(jīng)油酸鈉作用后的赤鐵礦紅外光譜研究未發(fā)現(xiàn)明顯的油酸鐵吸收峰，在磷灰石的紅外光譜中有明顯的油酸鈣吸收峰。
關(guān)鍵字: 赤鐵礦；磷灰石；油酸鈉；浮選；離子−分子締合物
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The flotation of hematite and apatite using sodium oleate as collector and the collection mechanism were studied through flotation tests, solution chemistry calculations and infrared spectroscopic analysis. The results show that hematite possesses good floatability in the pH range of 7−10 and apatite displays good floatability in the pH range of 3−12. Under the alkali condition, Ca2+ ions on apatite surface are activated adsorption sites and able to chemically react with sodium oleate. The ion and molecular association component in sodium oleate solution plays a dominant part in good floatability of hematite in weak alkali condition. Under the condition of pH=11.5, the absorption of oleic iron is found on the infrared spectra of hematite after the effect of oleate, and the absorption of oleic calcium is found on the infrared spectra of apatite after the effect of oleate.
Key words: hematite; apatite; sodium oleate; flotation; ion-molecular association
