閃亜鉛鉱のザンセート吸着に関する実験的研究 (第1報)
非活性閃亞鉛鉱に対する吸着
1958 年 74 巻 846 号 p. 1015-1021
詳細
1958 年 74 巻 846 号 p. 1015-1021
Sphalerite used in this investigation was handsorted from large crystalline mass obtained from Mitate Mine, Yamagata. Analyses of principal elements were as follows: Zn 63.60 pct; Fe 1.40 pct; Cu 0.09 pct; Pb trace; Mn 0.02 pet; Cd 0.30 pet; S 32.77 pet; Si02 0.40 pct.
The amounts of abstraction of xanthates were calculated from xanthate ion concentrations in solution before and after contact with the powdered samples. Xanthate ion concentrations were measured by counting the activity of S 35 labelled potassium ethyl xanthate (KEtX) in some experiments and by spectrophotometric method using 301mμ wave length in others.
From the experimental work the following results were obtained:
(1) The amount of KEtX adsorbed was extremely small as compared with copper-activated sphalerite and was almost nil at high pH value of solutions.
(2) The amount of KEtX adsorbed increased by addition of Zn ion in the solution. This phenomenon can be interpreted by theory of “common ion activation”.
(3) Also, adsorption exieriments were carried out with the higher alcohol xanthates such as butyl, amyl and hexyl xanthate. As a result, it was confirmed that adsorption of these xanthates had a correlation with solubility of their zinc xanthates, i. e., a potassium xanthate of which zinc xanthate has low solubility was more adsorbed than the others of which zinc xanthates have higher solubility, or vice versa.
Measuring solubility of the above zinc xanthates by different methods such as radiotracer technique using Zn 65 marked zinc xanthate, ultraviolet spectro-photometric method for xanthate ion, colorimetric determination of Zn using dithizone and polarography for Zn, the respective values obtainedwere fairly coincident. The value of solubility of zinc ethyl xanthate was found to be in the range from 1.215×10-3mol per 1 to 1.020×10-3mol per 1 at 25°C.
