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Machine translation
1. (WO1981002153) PRODUCTION OF HIGH PURITY AND HIGH SURFACE AREA MAGNESIUM OXIDE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/002153    International Application No.:    PCT/US1981/000153
Publication Date: 06.08.1981 International Filing Date: 30.01.1981
IPC:
C01F 5/12 (2006.01), C22B 26/22 (2006.01)
Applicants:
Inventors:
Priority Data:
117224 31.01.1980 US
Title (EN) PRODUCTION OF HIGH PURITY AND HIGH SURFACE AREA MAGNESIUM OXIDE
(FR) PRODUCTION D'OXYDE DE MAGNESIUM D'UN DEGRE ELEVE DE PURETE ET DE SURFACE SPECIFIQUE ETENDUE
Abstract: front page image
(EN)Process for refining a magnesium and nickel containing ore, comprising the steps of grinding the ore; preparing a slurry of the ground ore in sulfuric acid containing less than ten percent of water; adding water to the acid-ore slurry in an amount which is effective to initiate a sulfation reaction; allowing the sulfation reaction to continue, utilizing the heat of the sulfation reaction to heat the acid-ore slurry, whereby water-soluble metal sulfates and insoluble residue are formed; leaching the sulfation product with water to extract the water-soluble metal sulfates in solution; separating the metal sulfates solution from the insoluble residue; precipitating from the solution metals other than Mg as hydroxides; separating the solution from the metal hydroxide precipitate; concentrating the solution sufficiently to precipitate CaSO4; separating the concentrated solution from the precipitate; recovering dehydrated MgSO4 crystals from the concentrated solution; and decomposing the dehydrated MgSO4 crystals to form MgO of controlled surface area. Additionally disclosed are an autoclave step for reducing iron values in the metal sulfates solution, nickel or ferronickel recovery steps, a sulfuric-acid recycle; refactory MgO production steps, and Mg metal recovery steps.
(FR)Procede d'affinage de minerai contenant du magnesium et du nickel, comprenant les etapes de broyage du minerai; preparation d'une boue du minerai broye dans de l'acide sulfurique contenant moins de 10% d'eau; adjonction d'eau a la boue acide-minerai en une quantite permettant d'initier une reaction de sulfatation; poursuite de la reaction de sulfatation, en utilisant la chaleur produite par la reaction pour chauffer la boue d'acide-minerai, ce qui provoque la formation de sulfates metalliques solubles dans l'eau et de residus insolubles; lixiviation du produit de sulfatation avec de l'eau pour extraire les sulfates metalliques solubles a l'eau en solution; separation de la solution de sulfates metalliques des residus insolubles; precipitation de la solution sous forme d'hydroxides, de metaux autres que le Mg; separation de la solution du precipite d'hydroxides metalliques; concentration de la solution suffisamment pour precipiter le CaS04; separation de la solution concentree du precipite; recuperation des cristaux deshydrates de MgSO4 a partir de la solution concentree; decomposition des cristaux deshydrates de MgSO4 pour obtenir du MgO de surface specifique controlee. On decrit en outre une etape d'autoclave servant a reduire la teneur en fer de la solution de sulfates metalliques, des etapes de recuperation de nickel ou ferronickel, un recyclage d'acide sulfurique, des etapes de production de MgO refractaire et des etapes de recuperation metallique de Mg.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)