Flotation behavior and adsorption mechanism of fine wolframite with octyl hydroxamic acid

Preparation of Aliphatic Hydroxamic Acid from Litsea cubeba Kernel Oil and Its Application to Flotation of Fe(III)-Activated Wolframite

“…Figure 7 a showed that the infrared spectrum obtained for the Fe 3+ -activated wolframite surface did not change significantly after BHA adsorption. Figure 7 b indicated that after adsorption by AHA, the infrared spectrum of Fe 3+ -activated wolframite changed obviously, and the N-H and O-H stretching vibration peaks attributed to AHA at 3253 and 3008 cm −1 disappeared [ 16 ]. The stretching vibration peak attributed to methyl and methylene in the range of 2800–2900 cm −1 appeared on the surface of the Fe 3+ activated wolframite and the characteristic absorption peak attributed to the AHA also appeared in the range of 1000–1700 cm −1 .…”

“…According to the literature, the solid waste obtained from Litsea cubeba kernels contains ~25% of Litsea cubeba kernel oil, which mainly contains 10 and 12 carbon fatty acids. Furthermore, hydroxamic acid with medium and long carbon chains (8–12 carbons) has been widely used in mineral flotation, corrosion inhibition, and other chemical industries [ 14 , 15 , 16 ]. Therefore, Litsea cubeba kernel oil is a suitable raw material for the preparation of hydroxamic acid, which also provides a new way to utilize Litsea cubeba kernel solid waste.…”

The Effect of Quartz on the Flotation of Fine Wolframite with Octyl Hydroxamic Acid

“…However, the FT-IR spectrum for quartz treated with OHA in the dissolved solution of wolframite (see Figure 10c) had new peaks at around 2956 cm −1 , 2919 cm −1 , 2851 cm −1 , and 1649 cm −1 , of which the peak at 2956 cm −1 was attributed to the asymmetrical stretching vibrations of -CH 3 , and the peaks at 2919 cm −1 and 2851 cm −1 were related to the asymmetrical and symmetrical stretching vibrations of -CH 2 -. The new peak at 1649 cm −1 , with an offset of 13 cm −1 , was attributed to the stretching vibrations of C=O in the OHA molecule, which could be attributed to the iron and manganese hydroxamate precipitates [25]. These changes indicate that a chemisorption process was occurring during the interaction of OHA onto the quartz surface in the dissolved solution of wolframite.…”

“…Therefore, OHA might chemisorb on activated quartz surfaces through a covalent bond, which is consistent with the results revealed by FT-IR analysis. The oxygen atoms from carbonyl (C=O) and hydroxyl (N-OH) of OHA had a high affinity to bonding with the adsorbed Fe 2+ /Mn 2+ ions on quartz surfaces, and formed stable iron and manganese hydroxamate complexes [6,25]. The potential interactions are presented in Scheme 3.…”