Refining & Grade Specs

Antimony Refining Methods and Grade Specifications

The transformation of Antimony concentrate into refined products suitable for industrial use requires specialized metallurgical and chemical processes. Antimony is refined into 3 primary commercial forms, each serving specific end-use sectors.

Refining Processes

The primary refining and processing pathways for Antimony include:

1. Pyrometallurgical smelting
2. Hydrometallurgical leaching
3. Liquation

Product Forms and Grade Specifications

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

Quality Standards and Benchmarks

International standards for Antimony products are established by organizations such as ASTM International and various national standards bodies. Pricing is referenced against Fastmarkets/Asian Metals 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 Antimony is concentrated in a limited number of countries. China controls approximately 48% 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 flame retardants sector.