Production method for magnesium nitrate hexahydrate

The invention discloses a production method for magnesium nitrate hexahydrate. The method comprises the following steps: 1) adding magnesium oxide into a reaction vessel filled with dilute nitric acid in proportion for a reaction and controlling temperature and pH value in the reaction vessel; 2) subjecting a reaction solution to solid-liquid separation, filtering out inorganic impurities and allowing a filtrate to directly enter a heat-insulation storage tank; and 3) allowing an aqueous solution of magnesium nitrate in the storage tank to enter a granulation procedure so as to obtain a finished magnesium nitrate product. The production method provided by the invention is simple in process, omits the frequently used process of evaporative concentration, guarantees the quality of the magnesium nitrate product, shortens a production period and reduces energy consumption. 本发明公开了种生产六水硝酸镁的方法；所述方法包括如下步骤：1）氧化镁按比例加入到装有稀硝酸的反应釜中进行反应，控制反应釜温度、pH值；2）反应液进行固液分离，滤除无机杂质，滤液直接进入带保温的储罐；3）储罐内的硝酸镁水溶液进入造粒工序，得到粒状硝酸镁成品。应用本发明生产硝酸镁，工艺简