Silicon Removal from Battery Grade High-Purity Manganese Sulfate Solution

Manganese sulfate is an important basic chemical raw material widely used in fields such as fertilizers, coatings, catalysts, ceramics, and mineral processing.

Ordinary industrial grade pure manganese sulfate products or solutions can meet the needs of the above fields, but cannot meet the material requirements of lithium-ion batteries. Lithium manganese oxide and nickel cobalt manganese multi-element materials are the core directions of material demand for lithium-ion power batteries. With the development of new energy vehicles, the preparation and production technology of high-purity manganese sulfate has become a research hotspot in the field of manganese metallurgy.

Obtaining crude manganese sulfate solution is a mature technology in the field of wet manganese metallurgy. During the leaching process of manganese ore, impurities contained in the manganese ore will be synchronously leached into the solution, which will affect the performance of battery materials. These impurities must be deeply removed to obtain high-purity manganese sulfate solution, where silicon content is one of the important technical indicators of manganese sulfate.

At present, most of the commonly used desilication processes for manganese sulfate solutions achieve desilication effects under alkaline conditions. However, at the same time, alkaline environments can also cause loss of the main metal manganese in the manganese sulfate solution, and the pH required for subsequent impurity removal and extraction processes of the manganese sulfate solution does not match. In addition, these methods cannot achieve deep desilication.

The HP4800 silicon removal material developed by Haipu is a nano hybrid adsorption material. The polymer silicon removal material has abundant nanopores and excellent hydraulic diffusion performance, ensuring fast silicon removal adsorption rate and high activity of the adsorbent. The polymer chains in the adsorbent have high affinity with nanoparticles, providing good coating for nanoparticles and ensuring high mechanical strength and stability of the adsorbent.

The following table shows the silicon removal effect of our HP4800 product on the leachate of lithium iron phosphate waste batteries in the lithium battery recycling industry. The silicon content can be processed to below 1.