The fundamental roles of monovalent and divalent cations with sulfates on molybdenite flotation in the absence of flotation reagents

Abstract

Schematic of molybdenite oxidation and flotation in the presence of various cations. (a) Oxidised molybdenite edge, in the presence of (b) Na+, (c) K+, (d) Ca2+, and (e) Mg2+.

New insights into the beneficial roles of dispersants in reducing negative influence of Mg2+ on molybdenite flotation

“…Mg(OH) 2 was found to be the predominant phase, with most crystal faces being detected, indicating a quick formation of crystalline Mg(OH) 2 under the otation condition. As indicated in the previous studies [13][14][15] and Fig. 2 herein, MoS 2 otation recovery was reduced in 0.05 M MgCl 2 solution, primarily due to the formation and adsorption of Mg(OH) 2 on MoS 2 surface, consistent with the contact angle measurements (Fig.…”

“…3a), indicating a good hydrophobicity, similar to previous ndings. 15,35 However, a contact angle of 71 was observed in 0.05 M MgCl 2 solution (Fig. 3b).…”

“…28)), and Z refers to the covering area of the macromolecules on the particle surfaces. 13,15 With the increase of SS/SH dosage, MoS 2 recovery was increased to various degrees, indicating the benecial roles of SS and SH on MoS 2 otation, with the latter being more signicant. Specically, the MoS 2 recovery dramatically increased from 22% to 78% when SH was increased to 30 mg L À1 .…”

“…[10][11][12] However, seawater inhibits MoS 2 otation under alkaline conditions, primarily due to the adsorption of colloidal Mg(OH) 2 precipitated onto MoS 2 surface. [13][14][15] Therefore, great efforts have been made to reduce the negative inuence of seawater (especially Mg 2+ ions). For instance, Suyantara, et al 16 reported that the addition of emulsied kerosene prevented the adsorption of Mg(OH) 2 onto MoS 2 .…”

Fundamental Studies of SHMP in Reducing Negative Effects of Divalent Ions on Molybdenite Flotation

“…In the flotation of Cu-Mo sulfide minerals, pH adjustment to 9.5-12 is usually used to depress pyrite flotation [30]. The selected pH of 10 for MoS 2 flotation was consistent with many other studies [22,[47][48][49]. When 50 mg/L SHMP was added, MoS 2 recovery in CaCl 2 solution was increased from 73% to 79% while a more significant increase from 25% to 79% was observed when MoS 2 was exposed to MgCl 2 solutions.…”