硫化鉱浮選精鉱の熱電率
1985 年 101 巻 1164 号 p. 81-86
詳細
1985 年 101 巻 1164 号 p. 81-86
For better understanding of the semiconducting properties of particulate minerals, thermoelectric power (α) of 4 samples of sulfideare and 12 samples of flotation products supplied from the Hanaoka mine were measured. It was found that 2 samples of yelloware and one of blackare were n-type semiconductors. Only one sample of yelloware showed p-type behaviour. It was only possible to measure 4 of the 12 flotation samples; of these, 3 concentrates (Cu-Pb, Pb, and Py) were p-type semiconductors and one concentrate (Cu) was n-type. The other 8 samples had too high a resistance to measure.
At a later date (Jan. 1983) a further 10 samples of each concentrate were obtained. Cu-Pb and Cu concentrates showed large variations in α 50-150 and 80-180μV/deg, respectively.
It was found that, except for a few samples, measured values followed the relation.
α=±Eα/2eT
where Eα, e, and T are the activation energy for α, the charge of an electron, and absolute temperature, respectively. The electric conductivity was also measured'as a function of temperature. When Eα was less than 0.1eV, there was a linear correlation between the activation energies for the thermoelectric power and conductivity. A negative correlation between α and the copper content was found for the Pb concentrate, i. e., α=180 and 100μV/deg for Cu concentrations of 0.15 and 0.18 mol fraction, respectively.
