Method for dissolving non-amphoteric hydroxide with alkali

The invention discloses a method for dissolving non-amphoteric hydroxide with alkali. The method comprises the following steps: adding polyhydroxy carboxylic acid or polyhydroxy carboxylate and alkali into metal hydroxide, dissolving the metal hydroxide to obtain a solution containing metal ions, and then adding acid into the solution containing the metal ions to obtain the metal hydroxide. According to the method provided by the invention, reversibility of alkali-adding dissolution and acid-adding precipitation of the non-amphoteric hydroxide under the alkaline condition is realized, the method is simple to operate, and the raw materials are cheap and environment-friendly. 本发明公开了一种用碱溶解非两性氢氧化物的方法。所述方法包括：将多羟基羧酸或多羟基羧酸盐以及碱加入到金属氢氧化物中，使所述金属氢氧化物溶解，获得包含金属离子的溶液，然后向所述包含金属离子的溶液中加入酸，得到所述金属氢氧化物。本发明提供的方法实现了碱性条件下非两性氢氧化物的加碱溶解与加酸析出的可逆性，且该方法操作简单、原料廉价环保。