The recovery of fine wolframite is low when using traditional flotation that does not use a microbubble. In this study, a microbubble was introduced into the fine wolframite flotation system; −20 μm wolframite was used as an experiment sample and octyl hydroxamic acid as the collector. The recovery of microbubble flotation reached 84.07%, which is about 12.04% higher than that of traditional flotation. A single-factor flotation experiment, high-speed camera analysis, and SEM (Scanning Electron Microscopy) analysis were used to study the influence of microbubbles on the flotation of fine wolframite. The results show that fine wolframite will more easily agglomerate under the action of microbubbles. The octyl hydroxamic acid adsorbed on the surface of wolframite treated with microbubbles is denser and more abundant.Keywords:wolframite;fine particles;microbubble;flotation
With the depletion of rich fluorite ore, flotation process suitable for fine-grained fluorite is of great necessity. In this study, such method was preliminarily developed with a combination of in-situ surface modification and gas-liquid microdispersion. By introducing additives into ball-milling, the interaction between reagents and particles was improved. Through exploitation of selective sedimentation of undesired minerals via pH adjustment, the flotation of fine-grained fluorite was achieved with little or even no depressant in this study. Using a well-designed membrane dispersion device, effective interaction between the particles and bubbles was achieved, with massive expansion of the surface area in a limited space, enabling continuous flotation in a miniaturized device. Satisfactory product grade and recovery were obtained while reducing the use of additives, along with significantly decreased costs related to energy consumption, wastewater and flue gas treatment, and facility investments. The mechanism of this flotation separation strategy was summarized on the basis of empirical data. The strategy was effectively and flexibly applied to fluorite ores with different particle sizes and surface properties.
The flotation separation of fine-grained ilmenite and titanaugite is a challenging issue. This study employed an environmentally friendly inhibitor, sodium alginate (SA), to overcome this challenge. Single mineral flotation results demonstrated that SA exhibited significant depression on fine-grained titanaugite over a wide pH range, while inhibitory effects on ilmenite was small. Furthermore, binary mixed mineral flotation experiments revealed that a concentrate with a grade of 37.52 % and a recovery of 65.15 % could obtain using 6.0 mg/L of SA. AFM images confirmed that SA had stable and dense adsorption on the surface of titanaugite compared to ilmenite, which hindered further adsorption of NaOL. Zeta potential and FTIR analyses indicated that SA underwent strong chemisorption on the titanaugite surface, while its interaction with ilmenite was comparatively weak, resulting in a considerable increase in the floatability difference between the two minerals. XPS analysis and DFT calculations confirmed that the carboxyl group within SA formed a stable bridge adsorption configuration with the Ca and Mg sites of titanaugite. However, SA had feeble influence the chemical interactions between NaOL and the Fe site on ilmenite. Consequently, SA shows a greater affinity for titanaugite than ilmenite, which facilitates the selective separation of fine-grained ilmenite from titanaugite.
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