Refining & Grade Specs

Cobalt Refining Methods and Grade Specifications

The transformation of Cobalt concentrate into refined products suitable for industrial use requires specialized metallurgical and chemical processes. Cobalt is refined into 5 primary commercial forms, each serving specific end-use sectors.

Refining Processes

The primary refining and processing pathways for Cobalt include:

1. Solvent extraction and electrowinning (SX-EW)
2. Hydrometallurgical processing
3. High-pressure acid leaching (HPAL)

Product Forms and Grade Specifications

Refined Cobalt is available in the following commercial forms, each with specific purity requirements:

Quality Standards and Benchmarks

International standards for Cobalt products are established by organizations such as ASTM International and various national standards bodies. Pricing is referenced against LME/Fastmarkets MB assessments. These standards define minimum purity levels, acceptable impurity limits, and testing methodologies that facilitate international trade.

Refining Capacity and Geography

Global refining capacity for Cobalt is concentrated in a limited number of countries. DR Congo controls approximately 73% of primary production and plays a significant role in downstream refining. Efforts to diversify refining capacity are a key priority for governments seeking to reduce supply chain dependencies, particularly in the lithium-ion battery cathodes sector.