マグネシア含有酸化ニッケルペレットのガス還元に及ぼす微量のガス状硫黄の影響

DOI Web Site Web Site

書誌事項

タイトル別名
  • Effect of a Trace of Gaseous Sulphur on the Gaseous Reduction of NiO Pellets Containing MgO
  • マグネシア ガンユウ サンカ ニッケル ペレット ノ ガス カンゲン ニ オヨ

この論文をさがす

抄録

Experiments have been made on the reduction of NiO pellets containing MgO with H2 or CO-CO2 mixtures bearing gaseous sulphur in the temperature range from 773 to 1273 K using a thermobalance; the sulphur activity in the reducing gas ranged from the value in the coexistence of Ni and Ni sulphide to 10−2 of it.<BR>Except the reduction of pure NiO with H2 or 99%CO-1%CO2 mixtures, a macroscopic reduction pattern of a pellet in the absence of sulphur is a homogeneous type with the formation of a dense Ni shell on the entire surface of NiO particles, and the pattern in the presence of sulphur is a topochemical type with the formation of a fine porous Ni layer.<BR>The reduction in the former pattern is retarded following the rate equation of oxygen diffusion control through a dense metallic nickel layer, while in the latter one it proceeds without the retardation and conforms with the mixed control equation. These facts are also observed in the reduction of pure NiO with 50%CO-50%CO2 mixtures.<BR>The phenomena mentioned above can be interpreted by a mechanism that adatoms of sulphur on the surface of metallic Ni suppress the development of the bonding between Ni and NiO.<BR>The gas diffusion through a porous Ni layer and the mass transfer in NiO solid were discussed using some diffusion data available.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 51 (4), 319-327, 1987

    公益社団法人 日本金属学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ