Mutual Reaction of Lead Sulfide with Lead Sulfate

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  • 硫化鉛と硫酸鉛の相互反応について
  • リュウカ ナマリ ト リュウサン ナマリ ノ ソウゴ ハンノウ ニ ツイテ

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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:<BR>2Pb(1)+2H2S=2PbS+2H2<BR>PbS+2SO2=PbSO4+2S°<BR>PbS+PbSO4=2Pb+2SO2<BR>2H2S=2H2+2S°<BR>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.<BR>From the results obtained in this study, it can be concluded that:<BR>1) It has been demonstrated that gaseous PbS was thought to take an important part in the Pb formation.<BR>2) PbSO4 is rapidly converted into PbO·PbSO4 in the presence of gaseous PbS.<BR>3) This basic sulfate moves from 2PbO·PbSO4 to 4PbO·PbSO4.<BR>4) Over the lower temperature range, 4PbO·PbSO4 is easy to produce metallic lead by the reaction with gaseous PbS.<BR>5) Increasing temperature tends to promote the formation of metallic lead from 2PbO·PbSO4.<BR>These conclusions could be supported thermodynamically by log Pso2-logPpbs (g) equilibriudiagram.

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