Preparation of CaCO3 Fibers Coated with Fine Particles of Al(OH)3
1997 Volume 105 Issue 1221 Pages 374-376
Details
1997 Volume 105 Issue 1221 Pages 374-376
A suspension of C3AH6-NaOH was prepared by adding -37g of Ca(OH)2 with stirring into 2l of aqueous solution in which -27g of NaAlO2 is dissolved. The CaCO3 fibers having aspect ratios of -20 with diameters of -3μm were obtained by blowing CO2 gas into the suspension at 80-85°C. Successive CO2-gas-blowing at 25-30°C leads to precipitation of the fine particles of Al(OH)3 on the surface of the CaCO3 fibers, so that the CaCO3 fibers coated with fine particles of Al(OH)3 were obtained. By heating them at 500°C, the CaCO3 fibers coated with fine particles of activated alumina with large specific surface area of -120m2/g were also obtained. These coated layers firmly adhered to the CaCO3 fibers.
