Overview
Sodium aluminate (NaAlO₂) is an important inorganic chemical compound with versatile industrial applications. Primarily produced through the reaction of aluminum hydroxide with sodium hydroxide, this white crystalline substance serves as a key intermediate in various manufacturing processes. As a strongly alkaline compound, sodium aluminate finds extensive use in water treatment facilities where it acts as an effective coagulant for removing silica and phosphates. Its unique chemical properties make it valuable across multiple industries including construction, paper manufacturing, and textile processing.
Physical and Chemical Properties
Sodium aluminate typically appears as a white, odorless crystalline solid or as a clear aqueous solution. The compound exhibits high solubility in water, forming strongly alkaline solutions that can reach pH levels of 11-12 in typical working concentrations. When heated above 1650°C, sodium aluminate decomposes rather than melting. The solid form has a density of approximately 1.5-1.6 g/cm³. Chemically, it reacts vigorously with acids and can undergo hydrolysis in water. These properties make proper handling and storage essential for industrial applications.
Main Applications
In water treatment, sodium aluminate serves dual purposes as both a coagulant and for pH adjustment. It effectively removes silica, phosphates, and other contaminants from wastewater streams. The paper industry utilizes it for sizing and pitch control during pulp processing. The construction sector employs sodium aluminate as an accelerator in cement formulations, particularly for quick-setting applications. Additional uses include catalyst production, textile dyeing processes, and as a raw material for manufacturing other aluminum compounds. Recent developments have explored its potential in advanced materials synthesis.
Safety and Storage
As a strongly alkaline substance, sodium aluminate requires careful handling to prevent chemical burns. Workers should wear appropriate PPE including gloves, goggles, and protective clothing. Adequate ventilation is necessary when handling powdered forms to prevent dust inhalation. Storage recommendations include keeping containers tightly sealed in cool, dry areas away from acidic materials. Solution forms should be protected from freezing. Spills should be contained with inert absorbents and neutralized with weak acids before disposal according to local regulations.
B2B Procurement Guide
Industrial buyers should specify whether they require solid (anhydrous) or solution forms of sodium aluminate, as concentration significantly affects pricing and shipping costs. Typical commercial solutions contain 40-45% NaAlO₂. Quality parameters to verify include iron content (<0.01% for premium grades), chloride levels, and solution clarity. Bulk purchases (20+ tons) generally offer the best pricing, with tanker truck delivery being most economical for liquid forms. Establish long-term contracts to mitigate price volatility in aluminum feedstock markets.