Industrial Grade Aluminum Sulfate
Overview
Industrial grade aluminum sulfate is an inorganic salt with the formula Al2(SO4)3. It is produced by reacting bauxite or aluminum hydroxide with sulfuric acid. The industrial grade typically contains 15-17% Al2O3 and is widely used for its coagulating and flocculating properties. Unlike food-grade aluminum sulfate, the industrial variant may contain trace impurities but offers cost advantages for large-scale applications. Its primary value lies in water purification, where it serves as an effective coagulant for removing suspended particles and colloidal matter.
Physical and Chemical Properties
Industrial aluminum sulfate appears as white crystalline flakes or powder with a density of 2.672 g/cm³. It decomposes at 770°C rather than melting, releasing sulfur oxides. The compound is highly soluble in water (31.2 g/100 mL at 0°C), forming acidic solutions (pH ~2.5 for 1% solution). Key chemical properties include its ability to hydrolyze in water, forming aluminum hydroxide flocs that trap impurities. The industrial grade typically has 15-17% alumina content, with the remainder being sulfate ions and bound water molecules. Its hygroscopic nature requires careful storage to prevent caking.
Main Applications
The primary application of industrial aluminum sulfate is in water treatment plants, where it serves as a cost-effective coagulant for municipal and industrial wastewater. In paper manufacturing, it adjusts pH and improves sizing. The textile industry uses it as a mordant in dyeing processes. Additional applications include fire retardant formulations, soil conditioning, and as a raw material for producing other aluminum compounds. Some petroleum refineries employ it as a catalyst support. The compound's effectiveness depends on proper dosage control and water chemistry parameters.
Safety and Storage
Aluminum sulfate requires careful handling due to its acidic nature and irritant properties. Workers should wear chemical-resistant gloves, goggles, and protective clothing. Avoid inhalation of dust and contact with skin or eyes. Store in original containers or corrosion-resistant bins, away from alkaline substances and moisture. The storage area should be cool, dry, and well-ventilated. Bulk storage requires lined concrete or plastic containers to prevent corrosion. Shelf life is typically 2 years when stored properly.
B2B Procurement Guide
When sourcing industrial aluminum sulfate, verify the Al2O3 content (typically 15-17%) and iron content (should be <0.5%). Request certificates of analysis for heavy metals and insoluble matter. Bulk shipments (25kg bags or 1-ton super sacks) offer better economics for large consumers. Consider transportation costs and storage requirements. Some suppliers offer just-in-time delivery for water treatment plants. Quality consistency is crucial - establish long-term relationships with reputable manufacturers who can provide consistent product specifications.
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