Quicklime powder

The most critical factor is the Calcium Oxide (CaO) content, which should typically be above 85% to 95% depending on the application. You must also verify the reactivity (slaking rate), as high-reactivity lime reacts faster with water. Additionally, pay attention to the particle size distribution (mesh size); for example, 200-325 mesh is standard for chemical processes, while coarser grades may suit construction. Ensure the Magnesium Oxide (MgO) and Silica (SiO2) impurities are within acceptable limits to prevent unwanted chemical reactions.

Suppliers should ideally hold ISO 9001:2015 for quality management. For specific industries, look for compliance with ASTM C911 (for chemical and industrial uses) or ASTM C5 (for structural purposes). If the lime is used in water treatment, ensure it meets NSF/ANSI Standard 60 certification. Always request a recent COA (Certificate of Analysis) and a Third-Party Inspection Report (such as SGS or Intertek) to verify the chemical composition before shipment.

Quicklime is highly hygroscopic and reacts exothermically with moisture. Therefore, it must be packed in moisture-proof bags, typically PP/PE woven bags with an inner plastic liner or 1-ton jumbo bags (FIBCs). For long-distance cross-border shipping, ensure the supplier uses UV-resistant and hermetically sealed packaging to prevent the lime from absorbing atmospheric CO2 and moisture, which leads to 'air-slaking' and loss of potency.

Quicklime is a versatile chemical used extensively in Steel Manufacturing (as a flux to remove impurities), Water Treatment (for pH adjustment and softening), and Environmental Protection (flue gas desulfurization). It is also a staple in the Construction Industry for soil stabilization and the production of aerated concrete blocks, as well as in the Paper and Pulp industry for causticizing processes.

Quicklime is classified under IMDG Class 8 (Corrosive) or sometimes as a Hazardous Material (UN1910) for air transport because it generates significant heat when in contact with water, posing a fire risk. You must ensure the supplier provides a valid MSDS (Material Safety Data Sheet) and uses carriers experienced in handling dangerous goods. Always confirm that the shipping containers are completely dry and leak-proof to avoid maritime accidents.

Prioritize Audited Suppliers on Made-in-China.com who have undergone on-site inspections. Use the Secured Trading Service (STS) to ensure your payment is only released to the supplier after you have confirmed receipt and quality. It is highly recommended to request a pre-shipment inspection to verify that the CaO content matches the agreed specifications, as chemical quality can vary between batches.

Since Quicklime is a commodity, pricing is sensitive to raw material (limestone) and energy costs. Negotiate based on volume-based tiers; for instance, a 10-15% discount is common for orders exceeding 500 tons. Discuss Incoterms clearly—while FOB gives you control over freight, CIF might be safer if the supplier has established relationships with specialized chemical carriers. Also, negotiate a retention payment (e.g., 10%) to be paid only after the goods pass a local lab test upon arrival.

Many countries are imposing Carbon Border Adjustment Mechanisms (CBAM) or environmental taxes on carbon-intensive products like lime. Verify if your country has anti-dumping duties on chemical imports from specific regions. Ensure the supplier adheres to environmental compliance in their mining and calcination processes to avoid supply chain disruptions caused by government-mandated factory shutdowns in the exporting country.