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Activation mechanism of tantalum niobium flotation by lead ions in a combined collector flotation system

He Mingfei, Li Shuangke, Cao Miao, Gao Yude, Bu Hao, Meng Qingbo

Physicochemical Problems of Mineral Processing

2021

Vol. 57, iss. 1

29--38

The effect of lead ions on the flotation activation of tantalum niobium ore (TNO) was studied by micro-flotation, adsorption capacity experiments, solution chemical composition calculations, and infrared spectral analysis. The experimental demonstrated that the combined collector of salicylhydroxamic acid (SHA) and ammonium dibutyl dithiophosphate (ADDP) resulted in a strong collection capacity for TNO in the presence of lead ions. The solution chemistry calculations determined that the dominant source of lead ions in the aqueous solution was Pb(OH)+ at a pH of 8, which was conducive to the adsorption and interaction of SHA and ADDP anions. In the lead ion activation system, the combined reagent co-adsorbed onto the TNO surface, causing a large negative shift in the zeta potential. The co-adsorption mechanism of the combined collector consisted of complex chemisorption between SHA and the TNO surface active particles, while the main adsorption of ADDP is physisorption.

The effect of a novel depressant on the separation of talc and copper –nickel sulfide ore

Gu Guohua, Chen Zhixiang, Zhao Kaile, Song Siyu, Li Shuangke, Wang Chongqing

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

116--127

This paper researched the influence of the polysaccharide polymer sodium alginate (SAG) on the depression of talc at a fixed room temperature about 25 °C through micro flotation and batch flotation experiments, zeta potential and contact angle measurements as well as infrared spectroscopy analysis. The flotation results displayed that the SAG had a significant influence on the flotation of talc but less influence on sulphide flotation. Compared with the depressant carboxymethyl cellulose (CMC) and guar gum, using of the SAG gave the highest copper recovery. It could not only eliminate a talc removal step, but also significantly decrease in the depressant consumption by half at least. Sodium alginate apparently adsorbs on the talc surface and promotes hydrophilization, as revealed by contact angle tests (contact angle decreased from 75 to 33° after treating with SAG). It is demonstrated that the SAG obviously absorbed at the surface of talc but rarely for chalcopyrite through the results of zeta potential measurements and infrared spectroscopy analysis.