在氢氧化钠和相转移催化剂四丁基氯化铵的催化下，正丁醛缩合生成1,3,5?三乙基?6?正丙基?2?羟基?3?环己烯甲醛中间体；该中间体经亚氯酸钠氧化生成1,3,5?三乙基?6?正丙基?2?羟基?3?环己烯甲酸(HPTECHFA)。用HPTECHFA浮选萤石纯矿物，在矿浆pH为10、HPTECHFA用量为100 mg/L的条件下，萤石的回收率达90.60%。用HPTECHFA对坑口萤石实际矿石进行一次粗选浮选实验。结果表明：在30℃时，萤石粗精矿的品位和回收率分别达到82.71%和97.98%，与使用捕收剂油酸相比，CaF 2的品位提高2.23%，回收率提高1.86%；在10℃时，萤石粗精矿回收率达到89.88%，与使用捕收剂油酸相比，CaF 2的回收率提高16.09%。实际矿物浮选实验结果表明，HPTECHFA特别适合低温下萤石矿的浮选。红外光谱和Zeta电位测试表明，HPTECHCA能以化学作用方式吸附在萤石表面上。
A novel fatty acid 2?hydroxy?6?propyl?l, 3, 5?triethyl?3?cyclohexene?formic acid (HPTECHFA) was synthesized. 2?hydroxy?6?propyl?l, 3, 5?triethyl?3?cyclohexene carboxaldehyde intermediate was synthesized from n-butyraldehyde catalyzed by sodium hydroxide and phase-transfer catalyst tetrabutylammonium chloride. This intermediate was oxidized selectively into HPTECHFA by sodium chlorite. The flotation potential of HPTECHFA was assessed on fluorite mineral. The flotation results of pure minerals indicate that the recovery rate of fluorite reaches 90.60%under the flotation condition of pH 10 and HPTECHFA concentration of 100 mg/L. The results of bench-scale flotation tests of fluorite ore from Kengkou show that HPTECHFA achieves an excellent concentrate containing 82.71%CaF 2 with 97.98% CaF 2 recovery rate, the CaF 2 grade and recovery rate increase by 2.23% and 1.86%, respectively compared to those of oleic acid at 30 ℃. At 10 ℃, HPTECHFA achieves 89.88%CaF 2 recovery rate, and the recovery rate increases by 16.09%compared to that of oleic acid. The results of bench-scale flotation tests show that HPTECHFA is especially suitable for flotation of fluorite ore at low temperature. The results of IR spectra and Zeta potential demonstrate that HPTECHFA may be chemically adsorbed on fluorite surface.
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