Coffee Husk as Feldspar Substitute in the Manufacture of Enameled Ceramic Tile

Abstract

This study researches the effect of adding coffee husk (CH) and coffee husk ash (CHA) as partial feldspar substitutes to the manufacture of enameled ceramic tiles. Clays and other paste additives were characterized using XRD and XRF. The designed prototypes were pressed, dried, and fired at 1,120 °C. The physical (drying and firing shrinkage, apparent density, water absorption) and mechanical (flexion resistance) properties were evaluated and compared with standard fired specimens. Although the physical and mechanical properties of the specimens with 5 and 10 % CH and CHA make them suitable for the manufacture of BIIb ceramic tiles, it was concluded that CH and CHA under the working conditions do not replace feldspar in the preparation of enameled ceramic tiles due to surface quality defects.

Rheological, Physicochemical, Thermal, and Mechanical Properties of Biopolymeric Films Incorporated with Micro‐Holocellulose from Coffee Residues

“…Instead, SCG and its isolated cellulosic portion (HOLO-SCG) show higher rates of ashes (35 and 23 %, respectively), which are related to samples with other compounds such as antioxidants, lipids, soluble compounds, and lignin. [53] Besides, Figure 5b shows that maximum degradation temperatures are found at 132 °C for stage (i), three near temperatures at 237 °C, 256 °C and 274 °C for stage (ii), and a final temperature at 327 °C for stage (iii) which are found in the range explained in Figure 5a. The DTG peaks for stage (ii) can be associated with the thermal decomposition of linear and crosslinked moieties of CS and PVA.…”

“…Notwithstanding, Figure 5 shows samples with a final reduction weight loss of around 15–17 %, which means the sample became a solid carbonic residue called ashes. Instead, SCG and its isolated cellulosic portion (HOLO‐SCG) show higher rates of ashes (35 and 23 %, respectively), which are related to samples with other compounds such as antioxidants, lipids, soluble compounds, and lignin [53] …”

Revalorization of Coffee Residues: Advances in the Development of Eco-Friendly Biobased Potential Food Packaging

“…However, the main idea for the revalorization of CH is its use as a filler material since the biomaterial has a porosity of approximately 80%, which means that it occupies large spaces but has a very low weight [48]. Moreover, the increased production of CH, which is up to 30-50% of the dry basis of coffee cherries [49], could be exploited to reduce landfill contamination.…”

Editorial

“…En el área de materiales de construcción se publican tres artículos: "Coffee husk as feldspar substitute in the manufacture of enameled ceramic tile" [1], "Desarrollo de un producto cerámico para la construcción bajo principios de bioclimática y arquitectura sostenible" [2] y "Material Ecológico vapoli" [3].…”

“…En [1] se presentan los resultados de un procedimiento para determinar el efecto de la adición de cáscara de café (ch) y ceniza de cáscara de café (cha) como sustituto parcial del feldespato en la fabricación de baldosas de cerámica esmaltada. En [2] se propone el desarrollo de productos aislantes, para mejorar el rendimiento energético de las edificaciones.…”