Preparation and Characterization of Phosphate-sludge Kaolin Mixture for Ceramics Bricks

International Journal of Technology

JacksonMuliawan¹ 

关键词: Ceramics;    Firing;    Kaolin;    Phosphate-sludge;   

DOI  :  10.14716/ijtech.v9i2.1119

学科分类：工程和技术（综合）

来源: Universitas Indonesia

【 摘 要 】

Phosphate Sludge (PS) waste has been a problem in metal surface finishing industry. The waste cannot be dumped in landfill due to the metal content. Valorisation of the waste will be beneficial in a way that it conserves natural reserves and reduces energy consumption. This paper describes the attempt of utilization of PS by mixing it in kaolin in preparation of ceramic bricks. A series of experiments showed that mixtures containing between 25–50 mass % PS sintered at 1200oC attained the highest compressive strength of >25 MPa. X-ray diffractions (XRD) showed that the presence of PS hindered the formation of mullite, the phase that contribute to strength in Al2O3–SiO2 kaolin system. In the mixture of 1:1 kaolin: PS fired at 1200oC, cristobalite was formed, instead of mullite, as observed in the XRD patterns.

【 授权许可】

CC BY-NC-ND