Abstract
An efficiently optimized reagent regime was investigated to improve scheelite heating flotation. The scheelite grade and recovery in the plant were significantly improved by 5% and 6%, respectively, which remarkably augmented the economic profit by $260,000 per month. The interaction mechanisms of sodium sulfide and sodium oleate with scheelite, calcite and fluorite were evaluated by adsorption amount and Fourier transform infrared (FTIR) analyses. Sodium sulfide exhibited an excellent ability to promote the adsorption and desorption of sodium oleate on the scheelite surface and from the calcite and fluorite surfaces, thus facilitating the separation of scheelite from fluorite and calcite.
Highlights
Tungsten is a strategic metal for stockpiling in many countries because of its significant economic importance and high supply risk [1]
Sodium hydroxide and sodium sulfide are jointly applied with water glass to enhance the separation of scheelite from calcium-bearing minerals [20,26]
Sodium sulfide exhibits an excellent ability to simultaneously improve the scheelite grade and Sodium sulfide exhibits an excellent ability to simultaneously improveother the calciumscheelite grade recovery, whereas water glass depresses scheelite to some extent while depressing and recovery, water glass depresses scheelite to some extentsulfide while depressing other bearingwhereas minerals
Summary
Tungsten is a strategic metal for stockpiling in many countries because of its significant economic importance and high supply risk [1]. When the scheelite ore is associated with high-grade calcium-bearing gangue minerals, the classical Petrov process cease to be effective in achieving the ideal concentrate grade and recovery. Combinatory depressant, such as sodium hydroxide [24], lime [25] or sodium sulfide [26,27] combined with water glass, has been demonstrated to strengthen the selective depression of calcite and fluorite and improve scheelite flotation. Scheelite is subjected to the modified Petrov process, in which a collector (GYR), sodium hydroxide, sodium sulfide and water glass are used for heat cleaning to depress calcium-bearing gangue minerals and obtain qualified scheelite concentrate. The interaction mechanism of sodium sulfide and sodium silicate with scheelite, calcite and fluorite was evaluated by adsorption amount and Fourier transform infrared (FTIR) analyses
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