脂肪酸作捕收剂白云石浮选规律及其机理研究  

Study of flotation behavior and mechanism of dolomite with fatty acid as collector

作　　者：祁宗[1] 孙传尧[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京矿冶研究总院矿物加工科学与技术国家重点实验室,北京100070

出　　处：《中国矿业大学学报》2013年第3期461-465,共5页Journal of China University of Mining & Technology

基　　金："十一五"国家科技支撑计划项目(2007BAB08B02)

摘　　要：通过单矿物浮选试验,研究了饱和脂肪酸作捕收剂时白云石的浮选规律.以肉豆蔻酸、月桂酸为捕收剂时,酸性条件下药剂用量相对较小,当回收率达到70%时,酸、碱性条件下的药剂用量相差分别为3.72,5.64倍.FTIR,XPS测试结果表明在酸、碱性条件下,捕收剂均可以吸附于矿物表面,SEM测试表明在酸性条件下泡沫产品表面存在大量固体附着物.机理研究表明,碱性条件下,捕收剂与白云石之间以化学吸附为主.在酸性环境中,脂肪酸类捕收剂主要以不溶于水的脂肪酸固体的形式在矿物表面形成固体附着物,进而导致矿物表面疏水,使得在酸性条件下白云石也具有较好的可浮性.This study researches on the flotation behavior and mechanism of dolomite through the experiment of monomineral flotation in the use of fatty acid as collector.Results of flotation tests indicate that the agent dosage is relatively small in acidic environment with myristic acid and lauric acid as collector.When the recovery of dolomite researches 70% with myristic acid and lauric acid as collector,the difference of agent dosage under the condition of alkaline and acidic environment is 3.72 and 5.64 times,respectively.The measuring results show that： under the condition of acidic and alkaline environment,the collector is adsorbed on the surface of mineral.The measuring results of SEM show that a large amount of solid attachment is on the surface of foam product.The study of mechanism shows that the chemisorption mainly wages between collector and dolomite in an alkaline environment.In an acidic environment,the collector which belongs to fatty acid is mainly solid fatty acid which is hard to dissolve,and the solid attachment forms on the surface of mineral,giving rise to draining on the surface of mineral.That makes the dolomite have better floatability in an acidic environment.

关 键 词：白云石 单矿物浮选 溶液化学 饱和脂肪酸 

分 类 号：TD923[矿业工程—选矿]