Potassium titanate whisker( K2O.6TiO2) preparation method

Abstract

Disclosed is a process for preparing potassium hexatitanate whisker material with high factor of porosity, high bending strength, strong caustic corrosion resistance, low rate of deformation and high liquid holdup, which consists of charging mixture of other types of titanates and potassium-containing compound into potassium hexatitanate whisker, then carrying out granulating, modeling, sintering at 700-1050 deg. C, and water scrubbing.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous materials, in particular to a preparation method of potassium hexatitanate whisker porous materials. Background technique [0002] Porous ceramics have a wide range of applications in filtration, separation, and various catalytic reactions. α-Al 2 o 3 , ZrO 2 and TiO 2 It is the main material for the preparation of ceramic membrane supports at present. Due to α-Al 2 o 3 It has good thermal stability, stable crystal form at high temperature and low price, so it is the most widely used commercial ceramic membrane support and catalyst carrier. But Al 2 o 3 As a typical amphoteric oxide, it has poor corrosion resistance in non-neutral solutions [1] . Studies have shown that dense Al 2 o 3 After the sintered body was reacted in a high-concentration NaOH solution of 25mol / Kg at 150°C for 5 days, the mass loss was as high as 20%, accompanied by a sharp drop in flexural strength...

AI Technical Summary

Problems solved by technology

Many scholars add reaction raw materials (titanium-containing oxides and potassium-containing compounds) to potassium hexatitanate or directly use precursors to prepare potassium titanate ceramics. [12] , although the strength has been improved, but due to many reactions and complex processes, there are generally multiple phases, and the strong phase change reaction causes high density, small porosity, and low liquid holding capacity (water absorption rate 1.25 %, JP60231464) and material deformation are not easy to solve

In order to reduce the deformation of titanate ceramics, spherical particles such as alumina or ultrafine fibers are generally added [13] , but the impact of the impurities introduced on the material during use has not been resolved

There are also direct use of potassium hexatitanate as raw material by hot pressing, plasma method, etc. [14] Prepare high-strength ceramics. The potassium hexatitanate ceramics obtained by these methods have high density and small porosity, and require high preparation conditions and equipment

Images