The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 1979
Filed:
Jul. 22, 1977
Applicant:
Inventors:
Assignee:
Aluminum Pechiney, Lyon, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01F / ;
U.S. Cl.
CPC ...
423625 ; 423626 ; 423631 ; 423556 ;
Abstract
Alumina agglomerates with high mechanical strength and selectable particle size are obtained by compacting an intermediate product resulting from incomplete decomposition of a substance of the group comprising hexahydrated aluminum chloride, hydrated aluminum nitrate, hydrated aluminum sulfate of the formula Al.sub.2 O.sub.3, xSO.sub.3, yH.sub.2 O and hydrated aluminum sulfite of the formula Al.sub.2 O.sub.3, xSO.sub.2, yH.sub.2 O, which after thermal decomposition contain from 0.5 to 15% by weight of Cl, of nitrogen oxide expressed as N.sub.2 O.sub.5 or of sulfur expressed as SO.sub.3 or SO.sub.2, which compacted product is then granulated and the granulated product subjected to heat treatment.