Process for the manufacture of spheroidal bodies by selective agglomeration
US4902666A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Jan 11, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/21
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention relates to the preparation of small spheroidal solid agglomerates. More particularly, the process produces strong solid spheroidal agglomerates containing alumina or a mixture of alumina and at least one other inorganic material, which process comprises: PA0 (a) mixing at high speed a portion of alumina or a mixture of alumina and at least one other inorganic material in the form of hydrophilic mircon-sized particles in a water-immiscible liquid thereby forming a dispersion; PA0 (b) gradually adding to the dispersion an aqueous acidic phase while continuing the high-speed mixing until substantially spherical micro-agglomerates form within the water-immiscible liquid; PA0 (c) subjecting the micro-agglomerates to agitation in a vessel having a hydrophobic inner surface at a speed low enough to achieve substantially uniformly sized spheroidal agglomerates; PA0 (d) drying the agglomerates to produce hardened spheroidal uniformly sized agglomerates; and PA0 (e) optionally further separating the agglomerates by size. Optionally, the aqueous phase in step (b) may include the soluble salts of catalytic metals, and bases and/or colloidal-sized inorganic particles. These spher…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.