The method for preparing ultrafine magnesium hydroxide and basic magnesium sulfate whiskers from low grade magnesite relates to a method for preparing magnesian chemical products from magnesite.
Will first low-grade magnesite calcination after magnesium oxide content of 75% - 80% of the light burning powder, then add the part of the light burning powder and ammonium sulfate, and water to steam ammonia in the reactor, reaction after filtering impurities by magnesium salt solution, join the bubbling reactor, bubbled into by steamed the ammonia in the ammonia reactor, reaction after completely by aging, filtration, washing, drying high-purity ultrafine magnesium hydroxide product is available, the filtrate can be recycling use;
The mixture of magnesium hydroxide and magnesium sulfate was prepared by adding sulfuric acid solution to the other part of light sintering powder for hydration reaction. The basic magnesium sulfate whisker product was obtained by hydrothermal reaction.
The process of producing magnesium sulfate from magnesite ore has the advantages of low production cost, no pollution, high product purity and yield, and is suitable for large-scale production.