Title:
【発明の名称】高反応性高比表面積酸化鉄の製造方法
Document Type and Number:
Japanese Patent JPH03503156
Kind Code:
A
Abstract:
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 cm<2>/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 DEG C, reduction of the calcined oxide with a gaseous composition composed of 15 to 40 % of CO (carbon monoxide), 5 to 20 % of CO2 (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 DEG C.
Inventors:
Paixao, Jose Marcio Jardim
Application Number:
JP50465988A
Publication Date:
July 18, 1991
Filing Date:
June 09, 1988
Export Citation:
Assignee:
COMPANHIA VALE DO RIO DOCE
International Classes:
C01G49/02; C01G49/06; C01G49/08; C09K8/03; C01G; (IPC1-7): C01G49/02; C01G49/06
Attorney, Agent or Firm:
Akira Asamura (3 outside)
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