(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 通過純礦物試驗，研究金紅石在油酸鈉為捕收劑體系中的浮選行為。當(dāng)油酸鈉用量為20 mg/L、pH值為6~8時，金紅石浮選回收率均在80%以上；當(dāng)pH =7.5時，金紅石浮選回收率最高，為85.27%。Zeta電位及紅外光譜測試結(jié)果表明，油酸鈉在金紅石表面主要發(fā)生了化學(xué)吸附，同時也可能存在物理吸附。根據(jù)油酸鈉溶液化學(xué)計算，當(dāng)pH值為6~8時，油酸鈉溶液的優(yōu)勢組分為C17H33COO-和(C17H33COO)22-；而金紅石表面Ti4+的羥基化合物主要以[Ti(OH)2]2+和[Ti(OH)3]+形式存在。結(jié)合金紅石在油酸鈉捕收劑體系中的浮選行為，油酸鈉在金紅石表面的相互作用原理是，金紅石表面解離的Ti4+在水溶液中形成羥基化合物[Ti(OH)2]2+和[Ti(OH)3]+絡(luò)合在金紅石表面成為浮選的活性質(zhì)點，再與C17H33COO-和(C17 H33COO)22-作用形成Ti(C17H33COO)4，從而使金紅石疏水上浮；油酸(C17H33COOH(aq))分子和離子 -分子締合物(C17H33COOH？C17H33COO-)的物理吸附也可能存在。
關(guān)鍵字: 金紅石；油酸鈉；溶液化學(xué)；浮選
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The flotation behavior of rutile in the system with sodium oleate as collector was studied through pure mineral test. When the dosage of sodium oleate is 20 mg/L, and pH value of the pulp is set from 6 to 8, the flotation recovery of rutile is over 80%. The highest recovery of rutile is 85.27% when pH value of the pulp is 7.5. Zeta potential and IR spectra results show that the chemical adsorption mainly occurs on the surface of rutile for sodium oleate, and physical adsorption may also be present at the same time. Based on the results of solution chemistry calculation, C17H33COO- and (C17H33COO)22- are the main compositions when the pH value of the pulp is 6-8. [Ti(OH)2]2+ and [Ti(OH)3]+ are the major components of the hydroxyl compound of Ti4 +on the surface of rutile. Combined with the results of rutile flotation behavior, the surface interaction mechanism of rutile with sodium oleate is as follows: Ti4+ is exposed on the surface of rutile, and titanium hydroxyl complexes [Ti(OH)2]2 + and [Ti(OH)3] will form because of the dissolution of Ti4+ in water solution of the pulp. These Ti hydroxyl complexes are absorbed on the mineral surface and become the active point of flotation and then react with C17H33COO- and (C17H33COO)22- to form Ti(C17H33COO)4. Besides, physical adsorption of C17H33COOH(aq) and C17H33COOH？C17H33COO- on rutile may also happen.
Key words: rutile; sodium oleate; solution chemistry; flotation
