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Low cost honeycomb ceramic from natural, low grade attapulgite clay

Authors： XUE Ailian, FAN Zhaoru, MAO Hengyang, ZHOU Shouyong, LI Meisheng, ZHAO Yijiang

Units： School of Chemistry and Chemical Engineering, Jiangsu Engineering Laboratory for Environment Functional Materials, Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology, Huaiyin Normal University, Huaian 223300, Jiangsu, China

KeyWords： low-grade attapulgite clay, Al2O3, Honeycomb ceramics, extrusion molding, sintering

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(6):35-42

Abstract：

Honeycomb ceramics with regular, parallel channels have high mechanical strength, good thermal shock resistance, high specific surface area and good permeability. The performance of the honeycomb ceramics largely depends on the material and formation process. Low-grade attapulgite clay (LATP) is a natural, non-metallic mineral preferred for its abundance, low cost, inert property and low sintering temperature. In this study, honeycomb ceramics were prepared by extrusion molding and sintering of LATP and alumina. Carbon powder was used for making pores, methyl cellulose for binding, boric acid for sintering, while glycerol and liquid paraffin for plasticizing and lubrication, respectively. Plasticity of the mud was best when the content of water, binder and plasticizer were 17.5-20.0 wt.%, 8-10 wt.% and 3-4 wt.%, respectively. This produced excellent extrusion and subsequently, honeycomb ceramic green with no defects. After sintering at 700 °C for 3 h, the thickness of the walls and pore density were about 0.34 mm and 169 holes/in2, respectively. Open porosity, water absorption, volume density and mechanical strength was 43.43±0.1 %, 25.98±0.1 %, 0.9±0.1 g/cm3, 16.34±1.23 MPa, respectively. Honeycomb ceramics provided a new way for the application of low-grade attapulgite clay.

Funds：

国家自然科学金面上项目（21978109），国家自然科学基金国际(地区)合作与交流项目（22111530109）。

AuthorIntro：

薛爱莲（1977-），女，江苏淮安人，博士，副教授，主要从事先进膜材料与过程研究，E-mail：ailian1977@hytc.edu.cn.

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