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Floatation Behavior Study of Rare Earth-containing Phosphorite from Canada

Author: JiaLiPan
Tutor: CheXiaoKui；ZhengQi
School: Beijing Nonferrous Metal Research
Course: Mineral Processing Engineering
Keywords: Containing rare earth phosphate Bastnaesite Hydroxamic acid Flotation
CLC: TD913
Type: Master's thesis
Year: 2011
Downloads: 175
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Abstract

Rare earth ore beneficiation complex is in the field of mineral processing problems. Hydroxamic acid represented by the rare earth ore flotation has strong selectivity can be effective for some rare earth ore flotation, but the actual mineral composition vary, which requires a process the ore mineralogy, beneficiation process conditions and beneficiation research be carried out in order to determine the actual ore beneficiation methods adapted. In this paper, the Canadian containing rare earth phosphate process mineralogy research determined on the basis of the ore flotation methods, and for a lot of conditions for testing and closed-circuit test; Then through Bastnaesite and single mineral apatite flotation behavior, and Bastnaesite and surface properties of the mineral apatite, flotation reagent solution chemistry and the role of minerals and pharmaceutical research and analysis of the infrared spectra, discusses the mechanism of minerals and pharmaceutical. First, through the actual process mineralogy minerals studied to determine the ore and mineral composition of various elements and content. Research shows: RE mainly cerium (Ce02), lanthanum (La2O3), neodymium (Nd2O3) and other light rare earths, accounting for 77.74% of total rare earth, in which cerium (Ce02) accounted for 40.38% of total rare earth. Useful ore minerals include apatite and rare earth minerals (allanite, and monazite Bastnaesite), gangue minerals are mainly pyroxene, amphibole, chlorite, feldspar, calcite. The study also analyzed to determine a variety of useful minerals in the ore characteristics and disseminated dissemination size. Secondly, according to the mine craft mineralogical characteristics, determine the use of phosphorus and rare earth mixed recycling its flotation flotation process. By grinding test, adjust dosage and adjusting agent composition tests and collector dosage and composition of the test to determine grinding fineness is 85%-0.074mm to sodium fluoride and fulvic acid as gangue mineral assemblage suppression agents, 731 #, and Maoniuping collector for phosphorus and rare combination of the actual mineral collector for two roughing, two featured, sweeping away the election, flotation step phosphorus and rare earth concentrate containing mixture obtained REO 4.39%, P205 26.80%, rare earths and phosphorus recoveries were 86.85% and 97.63%. Conditions for single mineral tests showed: under various conditions, oil and sodium Maoniuping flotation collectors effects are superior to salicylic hydroxamic acid. Sodium oleate Bastnaesite selective weak, and strong selective hydroxamic acids. Maoniuping apatite flotation flotation best, followed by sodium oleate. In all conditions, salicylic hydroxamic acid collector for apatite almost no effect. Maoniuping flotation collectors of the two minerals better performance, but poor selectivity of sodium oleate collector performance center, salicylic hydroxamic acid collector worst performance but the best selectivity. Artificial mixed ore flotation results: sodium fine mineral oil was 34.75%, while salicylic hydroxamic acids fine mineral rate of only 8.46%, but salicylic hydroxamic acid concentrates Bastnaesite accounted 80.57%, while oil Sodium concentrate only 54.02% Bastnaesite. For minerals and pharmaceutical properties in solution for analysis, the following conclusions: In the pH = 8 ~ 9, a solution of Ce (OH) 2 concentration of the highest, and Ce (OH) 2 is a hydroxamic acids minerals and fishing closing occurred chelation agent key, which explains in pH = 8 ~ 9 时 Bastnaesite flotation best reasons; sodium oleate Bastnaesite flotation effect pH = 7 ~ 11 range increases with pH variation, this change with acid soap RCOOH · RCOO-dimer concentration changes relatively consistent, predictable dimer acid soap flotation played a decisive role. Apatite in the solution have a lot of Ca2 ion elution, and calcium ions and may produce a precipitate of sodium oleate, pH adjusting agent in conjunction with calcium carbonate can precipitate. With the increase of pH, calcium ions are preferentially react with sodium carbonate, which avoids the consumption of the collector, making it more effective to react with the minerals, so that better flotation. Hydroxamic acid chelates formed with Ca2 stability than Ce3 be a lot worse, so hydroxamic acid on apatite collector role not because agents with mineral sequestration. Minerals and IR spectra showed the role of agents: Bastnaesite action of an acid and the resulting hydroxamic association (OH) - to reduce or even disappear, while the formation of new chemical bonds, which indicates the presence of chemical adsorption, absorption products are mainly hydroxyl hydroxamic acid and cationic surface hydroxyl Bastnaesite chelate complexes formed with five-membered ring chelate-based; Bastnaesite sodium oleate effect only showed association (OH) - decreased or disappeared, Description of sodium oleate and Bastnaesite and no apparent surface chemical reaction, the adsorption is mainly electrostatic adsorption and adsorption. Apatite and infrared spectra of three insecticides did not change significantly.

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