Preparation method of cobalt hydroxide colloid

The invention discloses a cobalt colloid preparation method, which comprises: adding a cobalt salt solution to a boric acid-lithium hydroxide solution, and uniformly mixing to obtain a mixed solution; and dropwise adding a hydrazine solution into the mixed solution, and reacting to obtain the cobalt hydroxide colloid. According to the preparation method of the cobalt hydroxide colloid, the prepared cobalt hydroxide colloid is close to the real cobalt hydroxide colloid component and particle size of a primary loop, the preparation condition is milder than the high-temperature and high-pressure operation condition of the primary loop, and the preparation difficulty of the cobalt hydroxide colloid is reduced. 本发明公开了一种钴胶体的制备方法，包括如下步骤：向硼酸-氢氧化锂溶液中加入钴盐溶液，混合均匀后得到混合溶液；向所述混合溶液中滴加联氨溶液，反应后，获得氢氧化钴胶体。本发明的氢氧化钴胶体的制备方法，制备得到的氢氧化钴胶体接近一回路真实的氢氧化钴胶体成分和粒径，且制备条件相比一回路高温、高压运行条件更加温和，降低了氢氧化钴胶体的制备难度。