铝离子对油酸钠浮选石英的影响及作用机理  

Effect and Mechanism of Aluminum Ion on Quartz Flotation in the System of Sodium Oleate

作　　者：陈俐全 张凌燕[1,2] 陈志强[3] 段树桐[3] 管俊芳[1] 唐劭禹 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]矿物资源加工与环境湖北省重点实验室,湖北武汉430070 [3]蚌埠玻璃工业设计研究院,安徽蚌埠233018

出　　处：《金属矿山》2018年第1期120-124,共5页Metal Mine

基　　金：安徽省科技重大专项(编号:15czz02044)

摘　　要：为了揭示铝离子对油酸钠浮选石英的影响,并探讨影响机理,以0.038~0.074 mm的石英纯矿物为研究对象,进行了油酸钠浮选石英试验,并从Zeta、溶液化学和红外光谱分析角度对影响机理进行了分析。结果表明:(1)在无Al3+活化的情况下,油酸钠对石英没有捕收能力;Al3+过量会消耗油酸钠,进而影响对石英的捕收。(2)在有Al3+活化的情况下,油酸钠适宜在偏碱性矿浆中捕收石英,提高油酸钠的用量有利于石英浮选回收率的提高。(3)在矿浆pH=8,Al3+浓度为3×10-4mol/L,油酸钠浓度为6.25×10-4mol/L情况下,石英的浮选回收率可达93.4%。(4)未加入Al3+时石英在pH=2.0~12.0时表面带负电,因而阴离子捕收剂油酸钠不能使石英上浮;Al3+的活化使石英表面的Zeta电位明显上升,大约在pH=3.8~9.2时石英表面的Zeta电位为正值,石英表面吸附的Al3+成为石英吸附油酸钠的活性点,从而提高了石英的可浮性。(5)石英浮选回收率较高时溶液中Al3+主要赋存状态是Al(OH)3(S),铝离子羟基络合物的含量很低,说明Al(OH)3沉淀是活化石英的主要成分。(6)石英+油酸钠的红外光谱曲线与石英的红外光谱曲线相似,只是吸收峰的强度有所减弱,出现的也仅为Si—O键的特征峰。石英+Al3++油酸钠的红外光谱曲线上新出现了—CH2—的伸缩振动吸收峰和弯曲振动吸收峰,以及—CH3和—CO—的伸缩振动吸收峰,这些都是油酸根的特征峰,说明油酸根在石英表面发生了吸附。In order to describe the effect and mechanism of aluminum ion on quartz flotation in the system of sodium ole- ate, quartz flotation tests in the system of sodium oleate were carried out with 0. 038 - 0. 074 mm quartz pure mineral, and the mechanism was analyzed from views of zeta potential tests, solution chemical calculation and infrared spectroscopy analysis. The results showed that （1）sodium oleate did not collect quartz without activation of aluminum ion but excessive aluminuu ion will have negative effect on collection of quartz because of the consumption of sodium oleate. （2）With the help of aluminum ion, quartz can be collected by sodium oleate under the alkalescent conditions, and increasing the concentration of sodium oleate can raise the recovery of quartz in flotation. （3）The recovery of quartz in flotation could reach 93.4% under the conditions of pH value 8.0, Al3＋ concentration of 3.0×0.4 mol/L and sodium oleate concentration of 6.25×10-4 mol/L. （4）Without aluminum ion, the surface of quartz is negatively charged under the conditions of pH values from 2.0 to 12.0, so sodium oleate,an- ionic collector, can not float quartz. But when aluminum ion has been added, the zeta potential of the quartz surface becomes positive at pH values from 3.8 to 9.2, and aluminum ion adsorbed on the quartz surface becomes the active point of the quartz adsorbing sodium oleate ,which improves the floatability of the quartz. （5）When the recovery of quartz flotation is high ,the main form of Al3＋ in solution is A1 （OH）3（s） and the content of Al（OH） 2. and Al（OH）2 are very low, indicating that Al （OH）3（s） is the main component which activates quartz. （6）The infrared spectrum of quartz ＋ sodium oleate is similar to that of quartz, andonly the intensity of the absorption peak is weakened. The only characteristic peak is the peak of Si--O bond. The infrared spectrum curve of quartz ＋ Al3＋ ＋ sodium oleate shows the --CHz- stretching vibration absorption peak,--CH2-

关 键 词：石英 铝离子 油酸钠 活化 

分 类 号：TD923.1[矿业工程—选矿]