Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第4期    总第205期    2016年4月

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文章编号:1004-0609(2016)-04-0878-06
油酸钠作用下异极矿的浮选行为及作用机理
刘 诚,冯其明,张国范

(中南大学 资源与生物工程学院,长沙 410083)

摘 要: 通过纯矿物试验研究油酸钠为捕收剂体系中异极矿的浮选行为。结果表明:当油酸钠用量为3×10-4 mol/L、pH值为4~8和11时,异极矿浮选回收率均在80%左右。Zeta电位及红外光谱测试结果表明:油酸钠在异极矿表面主要发生化学吸附,同时也可能存在物理吸附。根据油酸钠溶液和锌离子水解组分含量化学计算,当pH值为4~8时,油酸钠溶液的优势组分为RCOO-和(RCOO)22-;而异极矿表面锌离子主要以Zn2+和少量ZnOH+形式存在。结合异极矿在油酸钠捕收剂体系中的浮选行为,油酸钠在异极矿表面的相互作用原理是异极矿表面Zn2+和羟基络合物Zn(OH)+成为浮选的活性质点,能与油酸钠作用形成油酸盐,从而使异极矿疏水上浮;RCOOH(aq)分子和离子-分子缔合物RCOOH·RCOO-的物理吸附也可能存在;而在pH为11时矿物可浮性较好,可能是油酸根离子与矿物表面的形成Zn(OH)2发生离子交换。

 

关键字: 异极矿;油酸钠;浮选

Flotation behaviors and mechanism of hemimorphite using sodium oleate as collector
LIU Cheng, FENG Qi-ming, ZHANG Guo-fan

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:The flotation behavior of hemimorphite using sodium oleate as collector was studied through pure mineral test. When the dosage of sodium oleate is 3×10-4 mol/L, and pH of the pulp is set as 4-8, the flotation recovery rate of hemimorphite is all about 80%. Zeta potential and IR spectra results show that the chemical adsorption mainly occurs on the surface of hemimorphite for sodium oleate. Based on the results of solution chemistry calculation of sodium oleate and ratio of hydroxyl Zn2+, RCOO- and (RCOO)22- are the main compositions when the pH of the pulp is from 6 to 8, Zn2+ and ZnOH+ are the major components of the hydroxyl compound of Zn2+ on the surface of hemimorphite. Combined with the results of hemimorphite flotation behavior, the surface interaction mechanism of hemimorphite with sodium oleate is as follows:Zn2+ and ZnOH+ on hemimorphite surface are activated adsorption sites and able to chemically react with sodium oleate. Besides, physical adsorption of RCOOH(aq) and RCOOH·RCOO- on rutile may also happen. The flotation recovery of hemimorphite around pH of 11 may be attributed to interaction between RCOO- and zinc on the hemimorphite surface and can be assumed that the adsorption of sodium oleate takes place by an ion exchange mechanism.

 

Key words: hemimorphite; sodium oleate; flotation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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