What is sodium oleate? The effects of the molar ratio ofNaOl on the recovery of diaspore and kaolinite were investigated. The effects of different NaOl to TDM molar ratios on diaspore and kaolinite flotation recovery. The effect of the molar ratio of NaOl to TDM on the recovery of diaspore is obvious. When the molar fraction of TDM is less than 20%, the flotation recovery of the diaspore with the mixed collector is higher than that with NaOl. With the increase of the molar fraction of TDM, the recovery of the diaspore decreases sharply. When the molar ratio of NaOl to TDM is 8:2, the recovery of the diaspore reaches the maximum of 91.4%. Unlike diaspore, the recovery of kaolinite does not change significantly with the molar ratio of the mixed collector. The recovery of kaolinite decreases slowly with the increase of the molar fraction of TDM. When the molar ratio of NaOl to TDM is 8:2, the recovery of kaolinite is 11.5%, which is 5.6% lower than that of single collector NaOl. Therefore, the optimum molar ratio of diaspore and kaolinite separated by the mixed collector is about 8:2 for NaOl: TDM.
Chemically pure sodium oleate Chemically pure sodium oleate (NaOl), chemically pure tert dodecyl mercaptan (TDM), and NaOl/TDM mixtures with different molar ratios were used as collectors. NaOl was supplied by China Pharmaceutical Group Chemical Reagent Co. Ltd., And TDM was supplied by Shanghai Macklin Biochemical Co. Ltd. All the reagents were ready-to-use to avoid drug failure. The analytical purity of hydrochloric acid (HCl) and sodium hydroxide (NaOH) were used as pH regulators of the system. Deionized (DI) water was used for all experiments. The mass ratio of diaspore to kaolinite in artificially mixed minerals is 3:1, and the A/S ratio of mixed minerals is 3.49. The flotation concentrates, and tails were filtered, dried, and weighed for single mineral flotation, and the recovery was calculated. For mixed binary mineral flotation, the content of Al and Si in the flotation products was analyzed, and A/S was calculated.
Sodium oleate was used as a single collector The recovery of diaspore using NaOl increases first and then decreases with the enhancement of pH. The best pH range for the flotation by NaOl is 9–11, which is consistent with the results of other scholars. The recovery of NaOl to diaspore reaches the maximum of 84.6%. Still, at this time, the recovery of NaOl to kaolinite also reaches 16.7%, so single collector NaOl cannot make an efficient separation between diaspore and kaolinite. Unlike NaOl, recovery of diaspore and kaolinite with TDM as collector alone is relatively low. The maximum recovery of diaspore by TDM at pH = 9 is only 42.8%. Neither NaOl nor TDM alone can achieve efficient flotation separation of diaspore from kaolinite. We considered further investigating the flotation of diaspore and kaolinite with NaOl/TDM mixed collector to obtain a better separation effect.
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