Sodium aluminates obtained from the al(no3)3 • 9h2o — naoh system using the controlled precipitation method

Sodium aluminate, NaAlO2• xH2O, is an important comer- cial chemical used in water treatment, as a source of alumi- nium in the preparation of zeolites and other catalytic mate- rials and as an additive in paper manufacturing. Sodium alu- minates were synthesised in this work by using the Al(NO3)3 •9H2O- NaOH system’s controlled precipitation method. Using the controlled precipitation method enabled identifying the process’s different stages from potentiometric titration of Al(NO3)3 • 9H2O dissolved in water and using NaOH as precipitating agent to ensure control and reproducibility and also identify final product characteristics. Powders were characterised by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and gravimetric and differential thermal analysis. The results indicated that NaAlO2 crystallised well at 1,000°C (obtained as the main crystalline sodium aluminate phase) and that β-alumina treatment began to form at 1,500°C.

• Autores: Ruiz Madroñero, Christhy Vanessa; Rodríguez Páez, Jorge Enrique
• Tipo de recurso: Article of journal
• Fecha de publicación: 2010
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/29643
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/29643; http://bdigital.unal.edu.co/19691/; http://bdigital.unal.edu.co/19691/2/; http://bdigital.unal.edu.co/19691/5/
• Palabra clave: Ingeniería Química; Ingeniería de Alimentos; aluminato de sodio; síntesis; precipitación controlada; Chemical Engineering; Food Engineering; sodium aluminate; synthesis; controlled precipitation method
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional