Method for preparing battery-grade ferrous sulfate heptahydrate by using acidic iron-containing waste liquid

• Main Authors: GAO SHIKANG, WU ZENGLING, WANG QIANKUN, SUN ZHONGMEI, XIAO QIN, JI CHANGQING, ZHONG PINGLI
• Format: Patent
• Language: Chinese; English
• Published: 22.12.2023
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; INORGANIC CHEMISTRY; METALLURGY

The invention discloses a method for preparing battery-grade ferrous sulfate heptahydrate from acidic iron-containing waste liquid. The method comprises the following steps: A, precise filtration; b, adsorbing iron; c, recycling iron; and D, crystallizing the ferrous sulfate heptahydrate. By utilizing the method disclosed by the invention, iron can be quickly and efficiently recovered from the acidic iron-containing waste liquid extracted by the wet process and prepared into the battery-grade ferrous sulfate, so that high-valued utilization of an iron source is realized, the iron salt is high in purity and environment-friendly, and a qualified iron source is provided for precursor development of an energy storage material. 本发明公开了一种利用酸性含铁废液制备电池级七水硫酸亚铁的方法，包括以下步骤：A、精密过滤；B、铁的吸附；C、铁的回收；D、七水硫酸亚铁结晶。利用本发明方法，可以快速、高效地从湿法提取酸性含铁废液中回收铁，并制备成电池级硫酸亚铁，实现铁源的高值化利用，铁盐纯度高、环境友好，为储能材料的前驱体开发提供合格的铁源。