硫化鉛と硫酸鉛の相互反応について
1980 年 96 巻 1108 号 p. 417-422
詳細
1980 年 96 巻 1108 号 p. 417-422
Recently, the roast-reaction in lead sulfide has been expected to come to the fore in relation to the days of high grade lead concentrates and energy conservation. In addition, the roast-reaction is noteworthy in the following thermochemical splitting of hydrogen sulfide:
2Pb(1)+2H2S=2PbS+2H2
PbS+2SO2=PbSO4+2S°
PbS+PbSO4=2Pb+2SO2
2H2S=2H2+2S°
Experiments were carried out by using mixtures of galena powder and reagent grade PbSO4 over the temperature range 650 to 750°C in a stream of inert gas. The progress of the reaction was followed with continuous analysis of evolved SO2. The reaction products were analyzed by X-ray diffraction.
From the results obtained in this study, it can be concluded that:
1) It has been demonstrated that gaseous PbS was thought to take an important part in the Pb formation.
2) PbSO4 is rapidly converted into PbO·PbSO4 in the presence of gaseous PbS.
3) This basic sulfate moves from 2PbO·PbSO4 to 4PbO·PbSO4.
4) Over the lower temperature range, 4PbO·PbSO4 is easy to produce metallic lead by the reaction with gaseous PbS.
5) Increasing temperature tends to promote the formation of metallic lead from 2PbO·PbSO4.
These conclusions could be supported thermodynamically by log Pso2-logPpbs (g) equilibriudiagram.
