Process for manufacturing high-purity magnesium oxide

Abstract

A process for converting magnesium chloride into magnesium oxide having the steps of: subjecting a magnesium chloride solution to a spray drying step in a spray-drying apparatus at a temperature of 300-475° C., resulting in the formation of a spray-dried product having 10-80 wt. % magnesium oxide and 20-90 wt. % of the total of magnesium hydroxychloride and magnesium chloride, subjecting the product of the spray drying step to a roasting step in a roaster at a temperature of 600-900° C. in the presence of water, resulting in the formation of a product having at least 98 wt. % of MgO, and less than 2 wt. % of the total of magnesium hydroxychloride and magnesium chloride, wherein the percentages of MgO, magnesium hydroxychloride and magnesium chloride, are calculated on the total of MgO, magnesium hydroxychloride and magnesium chloride.

Dependencies are inferred from the claim text.