Overview
Basic zinc carbonate (indirect method) is a white, odorless powder synthesized through a controlled precipitation process. It is distinct from direct-method variants due to its higher purity and uniform particle size. The compound is chemically stable and finds extensive use in industrial and pharmaceutical applications. Its production involves reacting zinc salts with sodium carbonate under specific pH and temperature conditions. This method ensures minimal impurities, making it preferable for high-end uses like medicine and advanced ceramics.
Physical and Chemical Properties
The compound decomposes at around 300°C, releasing carbon dioxide and leaving zinc oxide residue. Its insolubility in water makes it suitable for applications requiring slow zinc release, such as fertilizers or corrosion inhibitors. Key characteristics include a high surface area and reactivity with acids, enabling its use as a precursor for other zinc compounds. Its flame-retardant properties stem from endothermic decomposition, which absorbs heat and dilutes flammable gases.
Main Applications
In rubber manufacturing, it acts as an activator for vulcanization, improving tensile strength and elasticity. The ceramics industry values it for glazes and pigments due to its thermal stability and opacity. Pharmaceutical formulations utilize it as a mild astringent or zinc source. Additionally, it serves as a cost-effective UV stabilizer in plastics and a micronutrient in animal feed.
Safety and Storage
While low in toxicity, prolonged exposure to dust may cause respiratory irritation. Storage requires dry conditions to prevent caking or hydrolysis. Containers should be sealed and labeled per GHS standards (Hazard Class 9). Spills should be neutralized with dilute acid (e.g., acetic acid) and collected for disposal. Regulatory compliance (e.g., EPA, EU REACH) mandates SDS documentation for transportation and handling.
B2B Procurement Guide
Buyers should prioritize suppliers with batch-wise Certificates of Analysis (CoA) confirming Zn content (≥56%) and heavy metal limits (e.g., Pb <20 ppm). Bulk shipments typically use moisture-resistant woven bags with inner liners. Spot-check for off-odor or discoloration, which may indicate degradation. Long-term contracts often secure better pricing, especially for quantities above 5 metric tons.
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