Mercapto-Collectors

Compared with xanthate, the collecting capability of mercaptan is better in the flotation of Cu, Pb, Zn, and Fe sulfide minerals. But mercaptan performs low 

Mercaptan can be synthesized by adopting alcohol, sulfourea, and HBr as raw materials. The reactions can be given by the following  

4) Preparation of mercaptan from alkyl sulfates and NaHS 

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It has been recommended that one should co-precipitate traces of Te with Fe(OH)3 as collector (pH 6-9) [3]. Traces of Te(IV) have been separated from sea-water by coprecipitation with Fe(OH)3 and flotation [4]. The tellurium compounds with trifluoroethyl xanthate [5], methylpiperazine dithiocarbamate [6], and 2-mercapto-4-methyl-5-phenyl-azopyrimidine [7] can be co-precipitated with microcrystalline naphthalene. 

Mercapto-benzothiazole collectors are mainly comprised of mercapto-benzothiazole, benzimidazole, and benzoxazole. 

The flotation results of several sulfide minerals with sodium mercapto-benzothiazole as collector are listed in Fig. 1.7. NaOH and HCl were used to adjust pH. Meantime, 2 oil is used as frother in the flotation process. 

Fig. 1.7 Flotation results of several sulfide minerals with sodium mercapto-benzothiazole as collector...

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