Iron Removal from Leaching Solution of Hydrometallurgy

After 500-1500 charge and discharge cycles, the active materials of lithium-ion batteries will lose their activity, resulting in a decrease in battery capacity and causing the battery to be scrapped. The widespread use of lithium-ion batteries will inevitably lead to a large amount of waste batteries. If they are discarded indiscriminately, it will not only cause serious pollution to the environment, but also waste resources.

Lithium ion batteries contain abundant metal resources such as nickel (Ni), cobalt (Co), copper (Cu), lithium (Li), aluminum (Al), manganese (Mn), etc. The content of cobalt, nickel, manganese, and lithium can reach 30%, 20%, 20%, and 35%, or even higher, respectively.

Therefore, recycling the economically valuable metals in waste lithium-ion batteries is of great significance both in terms of environmental protection and resource recycling.

At present, the enterprises that recycle waste lithium-ion batteries mainly recycle valuable metals and then prepare them into battery materials, but battery materials have high requirements for impurity content. Waste lithium-ion batteries contain elements such as iron, aluminum, zinc, copper, and carbon. Therefore, in the process of recovering valuable metals from batteries, it is necessary to purify the leachate. However, how to remove the iron and aluminum in the leachate completely and reduce the amount of metal carried in the slag, the amount of slag generated, and the cost of impurity removal have always been several major challenges that plague the battery recycling industry.

Haipu utilizes the special functional groups of chelating resin to form complexes with heavy metal ions based on the characteristics of specific heavy metal ions, achieving the recovery and utilization of heavy metal ions. HT609 polymer has abundant nanopores and excellent hydraulic diffusion performance, ensuring fast iron removal and high activity of the adsorption resin.

HT609 is a special adsorbent material developed for iron removal, which has strong chelating ability for iron ions and chelated iron; Suitable for direct adsorption of iron under acidic to neutral conditions. After adsorption saturation, it can be regenerated directly with prepared acid. After cleaning with soft water, the next cycle of adsorption can begin; The saturated adsorption capacity can still reach 25g/L under complex water quality conditions. While adsorbing iron, the selectivity for metal ions such as zinc, nickel, and copper is weak.

The combination of iron removal resin and adsorption process can achieve the purification of iron in solution, which has good environmental and economic benefits.