(中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 通过纯矿物试验，研究金红石在油酸钠为捕收剂体系中的浮选行为。当油酸钠用量为20 mg/L、pH值为6~8时，金红石浮选回收率均在80%以上；当pH =7.5时，金红石浮选回收率最高，为85.27%。Zeta电位及红外光谱测试结果表明，油酸钠在金红石表面主要发生了化学吸附，同时也可能存在物理吸附。根据油酸钠溶液化学计算，当pH值为6~8时，油酸钠溶液的优势组分为C17H33COO-和(C17H33COO)22-；而金红石表面Ti4+的羟基化合物主要以[Ti(OH)2]2+和[Ti(OH)3]+形式存在。结合金红石在油酸钠捕收剂体系中的浮选行为，油酸钠在金红石表面的相互作用原理是，金红石表面解离的Ti4+在水溶液中形成羟基化合物[Ti(OH)2]2+和[Ti(OH)3]+络合在金红石表面成为浮选的活性质点，再与C17H33COO-和(C17 H33COO)22-作用形成Ti(C17H33COO)4，从而使金红石疏水上浮；油酸(C17H33COOH(aq))分子和离子 -分子缔合物(C17H33COOH？C17H33COO-)的物理吸附也可能存在。
关键字: 金红石；油酸钠；溶液化学；浮选
（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
