Overview
Sodium aluminate solution is an important inorganic compound produced by dissolving aluminum hydroxide in sodium hydroxide. It serves as a cost-effective source of soluble aluminum for industrial processes. The liquid form offers handling advantages over powdered alternatives in many applications. Its alkaline nature (pH 11-13) makes it particularly useful where simultaneous pH adjustment is required.
Physical and Chemical Properties
The solution typically contains 20-40% NaAlO2 by weight, with density ranging from 1.3-1.6 g/cm³ depending on concentration. It exhibits high thermal stability but gradually decomposes in atmospheric CO2. Key reactions include precipitation of aluminum hydroxide when neutralized, and formation of zeolites under controlled conditions. The solution's viscosity increases significantly at higher concentrations and lower temperatures.
Main Applications
In water treatment, sodium aluminate solution acts as a coagulant for phosphate removal and sludge conditioning. The construction industry uses it as an accelerator in shotcrete applications. The paper industry employs it for sizing and pitch control. Additional uses include catalyst production, textile mordanting, and as a raw material for synthetic zeolites. Emerging applications include wastewater treatment for heavy metal precipitation.
Safety and Storage
As a strong alkali, the solution requires corrosion-resistant storage in HDPE or rubber-lined steel containers. Exposure to acids produces hazardous aluminum hydroxide fumes. Personnel should wear chemical goggles, rubber gloves, and protective clothing when handling. Spills should be contained with inert absorbents. Shelf life typically exceeds 12 months when properly stored away from atmospheric CO2 ingress.
B2B Procurement Guide
Industrial buyers should specify: aluminum oxide content (as Al2O3), sodium oxide ratio, iron content limits, and viscosity requirements. Bulk shipments in tank trucks or ISO containers often provide the best economics. Quality verification should include density measurement and titrimetric Al2O3 analysis. Consider regional suppliers to minimize transport costs for this heavy liquid product. Just-in-time delivery helps prevent storage-related quality degradation.
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