Tungsten granule

granulates

Overview
GTP tungsten chemicals — Ammonium Paratungstate (APT), Ammonium Metatungstate (AMT) and tungsten oxide — are produced from secondary feedstock or virgin tungsten ore concentrates (wolframite, hubnerite, scheelite). Vertical integration and a Western supply chain enable supply security, consistent material flow and traceable quality across manufacturing stages.

Ammonium Paratungstate (APT)
At GTP's USA production facility, APT has been manufactured for over 50 years using established process routes. GTP APT is supplied with very low impurity content (APT impurity level typically below 0.003%). APT is a feedstock for high-purity tungsten oxides, metal powders and carbides, and is also used as an analytical reagent.

Ammonium Metatungstate (AMT)
AMT production begins from APT and requires roasting, digestion, filtration, evaporation and spray drying steps. AMT provides a water-soluble tungsten source with negligible alkali and metallic contaminants. Typical uses include feedstock for tungsten-based catalysts (oxidation, hydroxylation, hydrogenation, polymerization) and petrochemical catalyst systems.

Tungsten Oxide
Tungsten trioxide (WO3) is a thermally stable, water-insoluble tungsten compound used in the manufacture of tungsten metal powders. GTP produces several tungsten oxide grades that differ by oxygen content; these oxides are derived from internally produced APT.

Applications

• Aerospace
• Electronics
• Hard materials (carbides)
• Energy
• Catalyst industry (oxidation, hydroxylation, hydrogenation, polymerization)
• Absorbent gels
• Porcelain coloring agents

Manufacturing & Raw Materials
Products may be manufactured from secondary raw materials or virgin ore concentrates (wolframite, hubnerite, scheelite). Core manufacturing capabilities include roasting, digesting, filtering, evaporating and spray drying (notably for AMT production).

Technical specifications

• Product family: Ammonium Paratungstate (APT), Ammonium Metatungstate (AMT), Tungsten oxide
• Raw materials: secondary feedstock or virgin tungsten ore concentrates (wolframite, hubnerite, scheelite)
• APT impurity level: below 0.003% (typical for GTP APT)
• AMT properties: water-soluble tungsten, essentially free of alkali and metallic impurities
• Tungsten oxide: tungsten trioxide (thermally stable, water-insoluble); multiple oxide types produced (varying oxygen content)
• Typical downstream uses: tungsten oxides, metal powders, carbides, catalysts, laboratory reagents
• Manufacturing location (APT): USA facility with >50 years production experience
• Typical AMT processing steps: roasting, digesting, filtering, evaporating, spray drying