And Mechanism Of Spodumene Flotation Process Ningdu Quarry

With the popularity of lithium batteries, lithium and its compounds applied widely in industrial promotionin recent years, the demands for lithium grow rapidly so as to increase the development degree for lithiumresources continuously. Lithium resources are mainly occurrenced in Salt Lake and granite pegmatitedeposits.Though extraction of lithium from brine is low cost, lithium extraction technology from Salt Lakebrine was not perfect and the scale was not industrialized because brine resources are distributed in thehighlands in China, the development conditions are bad. So it is difficult to change the domestic lithium saltproduction with spodumene as raw materials in short terms.Spodumene resources in Chain are abundant andmainly occurrenced in granite pegmatite type rare metals, but often associated with pegmatite aluminumsilicate minerals such as mica, feldspar, quartz. It was greatly difficult to recover spodumene resources owingto similar floatability of these silicate minerals and easy-argillation, complex chemical component, variousstructures and interferenced seriously by inevitable ions, etc, and it has caused a waste of spodumeneresources.In order to achieve effective recovery of spodumene resources, spodumene flotation process wasstudied for Heyuan spodumene ore in Ningdu, Jiangxi of Jiangxi western resource Lithium Industry Co., Ltd.Process mineralogy study identify Li₂O grade between0.70%and0.80%. Complexcharacteristics are complex and occurrence forms are various, it is a typical granite pegmatitespodumene ore. Although lithium minerals exist mainly in the form of spodumene, some lithiumminerals was replaced by hydrothermal alteration or lattice, distributed in the form of cymatoliteor lepidolite. lithium minerals in the ore distributed uneven and embedded size fine-grained,monomer dissociation poor, it is essentially a complex and refractory low-grade spodumene ore.Flotation experiment was studied according to the ore properties, the results showed that“mica preferential flotation and then spodumene flotation” process was more suitable for this ore,The process adopted sulfuric acid as pH adjusting agent, dodecylamine as collector for micapreferential flotation, flotation tailings selecting NaOH as pH adjusting agent, CaCl₂as activator,（Oxidized paraffin soap+oleic） as the collector for spodumene flotation from mica flotaiontailings, and selecting flotation was conducted for spodumene rough concentrate after regrindingand adding Na₂CO₃, it could obtain spodumene concentrate with Li₂O grade of6.04%, Li₂Orecovery of76.77%.Compared with spodumene direct flotaion process, Li₂O grade could increase0.66%and Li₂O recovery rate up by4.61%. Mica preferential flotation and then spodumeneflotation process not only increased lithium grade, but also significantly improved lithiumrecovery, and it has a better application value.Pure mineral tests confirmed the results of small-scale test of the practical minerals, theaction mechanism of flotation reagents on spodumene was studied with flotation solutionchemistry and modern test technology. As was shown from the results, the main constituent contributing to active function of Ca²⁺was CaOH⁺. IR spectrum tests indicated that spodumeneminerals interacted with collectors after Ca²⁺activation, characteristic absorption peak wassignificantly enhanced, which indicated CaOH⁺was beneficial to adsorption of collectors onspodumene surface.