Overview
Dried sand is processed natural sand that undergoes thermal treatment to eliminate moisture, enhancing its suitability for industrial applications. It is primarily composed of silica (SiO2) and is valued for its consistency and dryness. The drying process ensures minimal clumping and improved flowability, making it a preferred material in precision-dependent industries like foundry work and construction. In China, 烘干砂 is widely used due to its controlled properties and cost-effectiveness. Unlike untreated sand, it reduces defects in casting and improves bonding in construction materials. Its production involves heating raw sand to temperatures exceeding 100°C, followed by sieving to achieve uniform granularity.
Physical and Chemical Properties
Dried sand exhibits low moisture content (typically below 0.5%), which prevents gas porosity in metal casting and ensures stable performance in high-temperature environments. Its particle size distribution is tightly controlled, often ranging between 50–200 mesh, depending on the application. The high silica content (over 95% in premium grades) contributes to its chemical inertness and thermal resistance. Key physical properties include a bulk density of 1.4–1.6 g/cm³ and a neutral pH, making it non-reactive with most binders and additives. Unlike wet sand, it does not require additional drying during industrial processes, saving energy and time. These attributes make it indispensable in sectors requiring precise material specifications.
Main Applications
In foundries, dried sand is a core material for mold and core production, where moisture-free sand minimizes steam explosions during metal pouring. The construction industry uses it in dry-mix mortars, concrete, and as a bedding material for pavers, leveraging its stability and ease of compaction. Glass manufacturers rely on its high silica purity for melting into glass products. Other applications include abrasive blasting for surface preparation, where its uniform granules provide consistent finishes, and water filtration systems, where its porosity aids in trapping impurities. Specialized grades are also used in ceramics and refractory materials, benefiting from its thermal resistance and low impurity levels.
Safety and Storage
While dried sand is non-toxic, prolonged inhalation of silica dust can cause respiratory issues such as silicosis. Workers should use NIOSH-approved dust masks and ensure proper ventilation in handling areas. Storage requires dry conditions to prevent moisture regain, which can compromise its quality. Bulk storage in silos or sealed bags is recommended. Fire hazards are negligible due to its non-combustible nature, but static electricity buildup during transport should be mitigated with grounding. Spills should be cleaned promptly to prevent slip hazards. Disposal follows standard inert material guidelines, though recycling is preferred to reduce environmental impact.
B2B Procurement Guide
Procuring dried sand involves verifying technical specifications such as moisture content, SiO2 percentage, and particle size distribution. Reputable suppliers provide material test reports (MTRs) to confirm compliance with industry standards like AFS (American Foundry Society) for foundry applications. Bulk purchases (20+ metric tons) often attract discounts, but ensure logistics align with storage capacity. Regional pricing varies; coastal areas may offer lower costs due to proximity to sand sources. For specialized applications (e.g., high-purity glass), request samples to test performance. Contracts should include clauses for quality rejection and moisture re-testing upon delivery. Preferred payment terms include LC or TT with inspection rights.
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