Advancing Cobalt Purity: Sunresin's Innovative Resin Technologies

Cobalt Refining and the Role of Ion Exchange Resins


With the cobalt industry increasingly turning to low-grade ores to reduce costs, the challenge of refining 

battery-grade cobalt sulfate has grown. These ores lead to intermediate products laden with impurities such as Cu, Zn, Fe, Mn, and Ni.


Cobalt Refining


Process Steps in Preparing Battery-Grade Cobalt Sulfate:

1.Impurity Dissolution:Using dilute sulfuric acid.

2.Reduction Leaching: Extracting cobalt content from crude cobalt hydroxide using reduction agents.

3.Oxidation Precipitation: Removing specific impurities such as iron, manganese, and arsenic.

4.Calcium and Magnesium Removal: Employing ammonium fluoride for precipitation.

5.Deep Purification: Utilizing P204* extractant.

6.Sodium Removal and Cobalt-Nickel Separation: With P507*.

7.Reverse Extraction: Achieving cobalt sulfate with sulfuric acid solution.

*Extractants P204: di(2-ethylhexyl) phosphoric acid and P507: 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester


The impurity content in the cobalt solution after reverse extraction meets China national standards, making it suitable for battery-grade cobalt sulfate preparation.

However, a significant challenge arises from the presence of oil phase components in the raffinate and reverse extraction agent. These can compromise the purity and performance of the cobalt products.


These oil phases mainly consist of dispersed oil, dissolved oil, and emulsified oil. The challenge lies in removing dissolved oil and emulsified oil. The presence of emulsified oil, dissolved oil, and dispersed oil results in an oil content in the raffinate or reverse-extracted solution exceeding 200 ppm, which is significantly higher than the required specification.


The Role of Ion Exchange Resins in Quality Enhancement:


Removal of Oil Impurities:

  • Suspended Oil: The resins are adept at adsorbing oil particles, ensuring their effective removal from the solution.

  • Dissolved Oil: By addressing dissolved oil, the resins play a pivotal role in augmenting the purity and overall quality of the liquid.


Spotlight on Sunresin's Expertise: Sunresin leads the way with its specialized high-porosity polymer-based adsorption resins. Tailored for oil removal in aqueous solutions, these resins stand out due to their exceptional adsorption capacity, rapid adsorption rate, ease of regeneration, simple operation and long service life due to their excellent mechanical and chemical stability.


Broadening the Application Horizon: Sunresin's premium resins excel in eliminating impurities from the leaching solution, marking a significant reduction of TOC (residual P204, P507, sulfonated coal oil, etc.), COD (Chemical Oxygen Demand). This method is not only efficient but also environmentally conscious, ensuring no new impurities are introduced. The result? Enhanced economic value and benefits.

As the cobalt industry continues to evolve, pioneering solutions like Sunresin's are setting the gold standard for quality and sustainable practices.


The oil removal process can also be applied to the resourceful treatment of oily wastewater generated e.g. from extraction processes or oil removal in various liquids.


Elevate Your Production Quality with Sunresin!

Curious about our high-porosity polymer-based resins? Head to our homepage to learn more about our innovations and their impact.


Sunresin offers a wide range of polymeric adsorbents and chelating resins as well as solvent impregnated resins e.g. with Cyanex272 and D2EHPA.


  Free Quote

Contact Us

Sunresin Park,No.135, jinye Road, Xi’an Hi-tech Industrial Development Zone, Shaanxi-710076, China
seplite@sunresin.com +86-29-89182091
Our Product List
Bio-Pharmaceutical & Life Science
Modern biopharmaceutical technologies typically use biological microbial fermentation...
Chemical Industry
Purification of chemical compounds has become a vital part of most industrial processes.
Drinking Water Treatment
Drinking water is essential to life. Every day every human being has to drink and use water for food preparation.
Food & Beverage Industries
Food is closely related to everyone, and the finishing of food comes from people's relentless pursuit...
Hydrometallurgy & Mining
Hydrometallurgy is a technique for extractive metallugry involving the three general area...
Direct Lithium Extraction (DLE)
Sunresin is the major DLE lithium sorbent producer in China which mainly used for extraction lithium from salar brine and geothermal brine etc with high efficiency.
Industry Water Treatment
There are many uses of water in industry and, in most cases, the used water also needs treatment to render...
Plant Extraction
Plant Extraction is a process to gather the trace bioactive compounds from the tissue of a plant.
VOCs Treatment
With the widespread use of chemical products in the industry, more and more organic...
Wastewater Treatment
Wastewater treatment is the process of converting wastewater into an effluent that can be discharged
Latest News
2024 01
 Sunresin has been selected for the Hang Seng China A Specialised & Sophisticated 50 Index
On January 22, Hong Kong's Hang Seng Index Company launched the "Hang Seng China A Specialised & Sophisticated 50 Index", and Sunresin (300487.SZ) was successfully selected as a constituent stock. As of January 12, 2024, the proportion was 2.78%.
2023 11
 Sunresin Participates in Morgan Stanley 22nd Annual Asia-Pacific Summit
Sunresin, a leading technology company, was invited to attend Morgan Stanley's 22nd Asia-Pacific Summit in Singapore from November 15th to 16th. This summit is a pivotal conference for institutional investors in the Asia-Pacific region.

Leave a Message

Please send any questions you want to know, we will reply to you immediately.
Choose File
Here to Provide Complete Separation and Purification Solutions
Sunresin Park,No.135, jinye Road, Xi’an Hi-tech Industrial Development Zone, Shaanxi-710076, China
Call us on: