| 摘要 |
<p>The present invention refers to a process for the obtention of iron oxide having high reactivity and high specific surface, utilized, mainly, as hydrogen sulphide absorber in oil drilling muds, which is obtained from calcination and reduction of natural and/or synthetic iron oxides and presents specific surface superior to 100.000 cm2/g. The process, object of the present invention, comprises the steps of calcination of natural iron oxides, with granulometry inferior to 3.0 mm, at temperatures in the range of 400 to 1000°C, reduction of the calcined oxide with a gaseous composition composed of 15 to 40 % of CO (carbon monoxide), 5 to 20 % of CO¿2? (carbon dioxide), 1 to 30 % of H2 (hydrogen) and 10 to 70 % of N2 (nitrogen), followed by cooling, in a reducing or neutral atmosphere, at temperatures lower than 140° C.</p> |
