硫化鉱の酸化に関する研究 (第2報)
閃亜鉛鉱の焙燒について
1955 年 71 巻 808 号 p. 645-650
詳細
1955 年 71 巻 808 号 p. 645-650
Mechanism and Kinetics of the roasting reaction of zinc blende were studied by measuring the change in weight and gas analgses at temperatures from 500°to 925°C. The results obtained are as follows:
(a) Oxidation:
An experimental equation, on the rate of oxidation was
1-(1-x)1/2=kt (825-900°C)
where x is the amount of S reacted/total amount of S in sample and t the time. The activation energy calculated was about 8.8 kcal, thus it was considered that the rate determining step inthe present oxidation would be the rate of diffusion.
(b) Sulphatization
The quantity of sulphate produced and the rate of sulphatization were calculated from the relation between the change in weight and the results of gas analyses. It was concluded that the present sulphatizing reaction obeyed an indirect process in which the sulphatization follows the oxidation.
The conditions for the muximum rate of sulphatization and the effects of the roasting atmospher being SO2-O2 or SO2-air were also studied.
