Overview
Sodium tetrahydroxoaluminate is an important inorganic compound primarily existing as a solution or crystalline solid. It is commercially significant in various industrial processes due to its alkaline nature and ability to form stable complexes with aluminum. The compound is typically produced by dissolving aluminum hydroxide in sodium hydroxide solution. Its tetrahydrate form is more commonly encountered in industrial settings than the anhydrous version.
Physical and Chemical Properties
As a white crystalline solid, sodium tetrahydroxoaluminate is highly soluble in water, forming a strongly alkaline solution. The compound is hygroscopic and reacts with acids to form aluminum hydroxide and sodium salts. In solution form, it appears colorless and viscous. The pH of commercial solutions typically ranges between 12-14, making it strongly caustic. The compound demonstrates stability under normal conditions but decomposes at elevated temperatures.
Main Applications
In water treatment, sodium tetrahydroxoaluminate serves as an effective coagulant for removing suspended solids and phosphates. The paper industry utilizes it for improving paper strength and as a sizing agent. The compound also functions as a key intermediate in alumina production processes. Additional applications include use in concrete setting accelerators, textile dyeing processes, and as a catalyst support in some chemical reactions.
Safety and Storage
Proper handling requires chemical-resistant gloves, goggles, and protective clothing due to its corrosive nature. Inhalation of dust or mists should be avoided through adequate ventilation or respiratory protection. Storage recommendations include keeping containers tightly closed in dry, cool areas away from acids and other incompatible substances. Secondary containment is advised for large quantities to prevent environmental contamination in case of leaks.
B2B Procurement Guide
Industrial buyers should specify required concentration (typically 30-50% w/w for solutions), aluminum oxide content, and impurity limits. Bulk purchases in tanker trucks or intermediate bulk containers (IBCs) offer cost advantages for regular users. Quality certifications to request include ISO 9001 and relevant industry-specific standards. Consider suppliers with proven track records in chemical distribution and proper transportation infrastructure for hazardous materials.
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