Study on Mechanism of Activator of Tungsten Ore Flotation Agent

Cheng Xinchao studied the role of lead nitrate in the flotation process of tungsten by CF method. Studies have shown that the main active components of lead nitrate are Pb2+ ions and PbOH+ ions. In the presence of lead nitrate, the CF agent is chemically adsorbed on the surface of scheelite and wolframite. Its action form is that Pb2 + ions or PbOH+ ions are first chemically adsorbed on the surface of scheelite and wolframite, then CF agent and adsorption. to Pb2 and scheelite wolframite + ions and surface PBOH + ions chemically react with the agent to generate the metal chelate CF; regardless of presence or absence of lead nitrate, CF physisorption adsorption agents are calcite and fluorite surface In different pH ranges, the active components of Pb2+ activated mineral flotation are diverse. In the low pH range, the effective component of Pb2+ ion activated wolframite flotation is PbOH+, and Pb2+ ions are in the high pH range. The effective component of adsorption and its activation is the surface precipitation of lead hydroxide.

Zhong Chuangang studied the effect of metal ions on the flotation of wolframite and quartz in benzoate, and pointed out the influence of Fe3+, Fe2+, Cu2+, Mn2+, Ca2+ and Mg2+ on the flotation of wolframite and quartz. Very small, Pb2+ can obviously activate the dolomite flotation; the pH value of the slurry is an important condition for the separation of the black tungsten ore and quartz. The pH of the slurry is preferably controlled to be weakly alkaline; the metal ion can cause the helium-potential curve of the black tungsten ore. The degree of positive shift is Pb2+>Fe3+>Mn2+>Fe2+>Ca2+>Mg2+, but the sign is not changed, indicating that the metal ions are mainly concentrated in the diffusion layer of the electric double layer, which acts to compress the electric double layer. The metal ions increased the contact angle of the wolframite to different extents, and the effect of Pb2+ ions was the most obvious. After the addition of benzoic acid, the contact angle continued to increase, indicating that Pb2+ ions promoted the adsorption of benzyl hydroxamic acid.

Xiong Li Research pointed out that the addition of Pb2+ ions in the slurry enhances the selectivity and inhibition ability of water glass, promotes the formation of inhibitory SiO(OH)3- ions, and generates SiO(OH)3- and PbOH+ ions. A composite silicate with good adsorption and strong adsorption capacity, a large amount of colloidal Pb(OH)2 is formed, which is mixed with Si(OH)4, thereby enhancing the selectivity and strength of inhibition; The PbOH+ ion can separate from the surface of the scheelite and adsorb on the surface of the mineral, so that the negative charge of the mineral surface is reduced or positively charged, thereby increasing the electrostatic attraction of the anion collector and improving the floatability of the scheelite.

Sodium carbonate is a commonly used modifier for white tungsten flotation. It can adjust the pH value of the slurry and improve the selectivity of water glass [26]. Under the condition of sodium carbonate, the selective inhibition of water glass calcite and fluorite Can be played to the maximum [14]. When oleic acid is used as the collector, and the pH requirement of the slurry is greater than 11, the pH of the slurry can be adjusted by mixing NaOH and soda to prevent precipitation of oleic acid and calcium and magnesium [16].

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