Overview
Zinc blocks are refined metallic zinc typically cast into rectangular ingots for industrial use. With a purity of 99.995% or higher, they serve as primary raw material for downstream zinc processing. The global zinc block market is driven by demand from construction (galvanized steel) and transportation sectors. China, Australia, and Peru lead in zinc production, with LME-certified blocks being the trade standard. Electrolytic refining produces the highest purity zinc, while thermal distillation yields commercial-grade blocks. The metal's recyclability (80% recovery rate) makes it an environmentally preferred choice.
Physical and Chemical Properties
Zinc blocks exhibit characteristic bluish-silver luster with hexagonal crystal structure. They maintain stability in dry air but develop a protective carbonate layer (patina) when exposed to moisture. The metal shows anisotropic mechanical properties—relatively brittle at room temperature but becomes malleable above 100°C. Chemically, zinc is amphoteric, dissolving in both acids (forming Zn²⁺ salts) and strong alkalis (yielding zincates). Its -0.76V standard electrode potential makes it an effective sacrificial anode. Thermal conductivity (116 W/m·K) and electrical resistivity (59 nΩ·m) suit it for electrical components.
Main Applications
Over 50% of zinc blocks are processed into galvanizing solutions for steel corrosion protection. Hot-dip galvanizing baths typically operate at 450°C using zinc blocks with <0.01% lead content. The automotive industry consumes zinc for die-cast alloys (e.g., Zamak) combining it with aluminum and copper. Chemical manufacturers use zinc blocks to produce zinc oxide (rubber additive), zinc chloride (wood preservative), and zinc sulfate (agricultural supplements). Emerging applications include zinc-air batteries and anti-corrosion coatings for offshore wind turbines. Pharmaceutical grades (99.999% purity) are essential for dietary supplements.
Safety and Storage
Zinc blocks pose low immediate hazard but require precautions. Dust from machining may cause metal fume fever if inhaled—use local exhaust ventilation. Store separately from acids and oxidizers to prevent violent reactions. Larger blocks should be stacked on wooden pallets to avoid moisture-induced white rust. For transportation, UN3077 (environmentally hazardous substances) labeling applies when shipped as powder. Workers handling molten zinc need heat-resistant PPE and hydrogen detectors (zinc + moisture produces H₂). Spills should be collected dry; water contact generates flammable hydrogen gas.
B2B Procurement Guide
Industrial buyers should specify: 1) Purity grade (SHG 99.995% vs. Prime Western 99.5%), 2) Physical dimensions (common 25kg blocks or custom sizes), 3) Trace element limits (critical for galvanizing), and 4) Packaging (bare or plastic-wrapped). Request mill test certificates with ICP-OES analysis. Consider delivery terms—LME warehouses offer standardized blocks, while direct mill purchases allow customization. For long-term contracts, price indexing to LME zinc futures (USD/ton) is advisable. Asian buyers often prefer CJK (China-Japan-Korea) standard blocks with tighter lead/cadmium controls.
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