摘要
萤石(CaF_(2))是一种关键战略性矿产资源,在自然界中常与同为含钙矿物的方解石(CaCO_(3))共生。泡沫浮选是分离这两种含钙矿物最主要的方法,但萤石和方解石表面的钙活性位点相似,导致其选择性分离一直是世界性难题。萤石浮选中常用水玻璃抑制方解石,实现萤石正浮选富集。然而,水玻璃选择性低且用量大,导致部分萤石被抑制无法回收,且因其分散性好会造成尾矿难以沉降、尾水难以处理等问题。本文提出了抑制萤石浮选方解石的反浮选思路,并开发了一种绿色萤石抑制剂—二乙烯三胺五甲叉膦酸(DTPMP)。单矿物、二元混合矿及实际矿浮选试验表明,在中性pH下,以油酸钠(NaOL)作捕收剂、低用量的DTPMP作抑制剂,可实现萤石的反浮选分离。药剂吸附量检测和傅里叶变换红外光谱(FTIR)表明,DTPMP在萤石表面的吸附量更多、吸附强度更大。密度泛函理论(DFT)计算结果表明,DTPMP更容易在萤石表面吸附,且DTPMP膦酸基团中的H原子与萤石表面的F原子生成的氢键作用较强。因此,DTPMP作为一种绿色高效的抑制剂,在萤石浮选领域具有较好的工业应用前景。
Fluorite(CaF_(2))is an important strategic mineral,which is often closely intergrown with calcite(CaCO_(3)).Froth flotation is the main method for separating the two calcium-bearing minerals,but the selective separation of fluorite and calcite has always been a worldwide problem due to the similar calcium active sites on their surfaces.Sodium silicate is often used in fluorite flotation to depress calcite and enrich fluorite.However,the low selectivity and large amount of sodium silicate will not only lead to some fluorite being depressed and unable to be recovered,but also bring about the problems of difficult settlement for tailings particles and low efficient treatment in tailings wastewater.Therefore,the reverse flotation idea of depressing fluorite and collecting calcite by a green fluorite depressant named diethylene triamine penta methylene phosphonic acid(DTPMP)was proposed.The results of flotation tests of single minerals,binary mixed minerals and real ore indicate that fluorite can be enrich by reverse flotation with sodium oleate(NaOL)as collector and low dosage of DTPMP as depressant at neutral pH.The adsorption capacity test and fourier transform infrared spectroscopy(FTIR)confirm that the adsorption of DTPMP on fluorite surface has more adsorption capacity and stronger adsorption strength than calcite.The density functional theory(DFT)calculation results reveal that DTPMP is more easily adsorbed on the fluorite surface,and the H atom in the phosphonic acid group of DTPMP has a strong hydrogen bonds with the F atom on the fluorite surface.Therefore,as a green and efficient fluorite depressant,DTPMP has a good industrial application prospect in flotation field.
作者
吴望妮
陶黎明
范瑞华
彭涛
王建军
高志勇
WU Wangni;TAO Liming;FAN Ruihua;PENG Tao;WANG Jianjun;GAO Zhiyong(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China;Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral Resources,Central South University,Changsha 410083,China;Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization,Central South University,Changsha 410083,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第2期598-610,共13页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(U2067201)
湖南省科技创新领军人才项目(2021RC4002)
湖南省杰出青年科学基金资助项目(2020JJ2044)
湖南省重点研发计划项目(2021SK2043)
国家“111计划”资助项目(B14034)。
关键词
方解石
萤石
浮选
抑制剂
二乙烯三胺五甲叉膦酸
calcite
fluorite
flotation
depressant
diethylene triamine penta methylene phosphonic acid
