Preparation of Ultrafine Al(OH)3 Powders from Scrap Aluminum

摘要

The homogeneous precipitation pathway was explored to synthesize ultrafine powders of Al(OH)3.In the experiment,the scrap aluminum were used as raw material.The effects of reaction time,reaction temperature,stirring speed,concentration of sulphuric acid and dispersant on the preparation process were investigated.The results showed that ultrafine Al(OH)3 powders can be yielded and well-controlled under the following optimal conditions:the concentration of sulphuric acid 3.0 mol·L-1,reaction temperature 0-4 ℃,stirring speed 900 r.min-1 and reaction time 15 min.The diameter less than 100nm of sphericity Al(OH)3 particles with the narrow distribution were successfully obtained.The Al(OH)3 powders was analyzed with scanning electron microscopy,infrared spectrometer.The Al(OH)3 powders have good dispersancy and purity is more than 90％.The operation of the experiment was very simple,and the particles were separated easily.