Recycling of the product of thermal inertization of cement-asbestos for various industrial applications.
Recycling of secondary raw materials is a priority of waste handling in the countries of the European community. A potentially important secondary raw material is the product of the thermal transformation of cement-asbestos, produced by prolonged annealing at 1200-1300 °C. The product is chemically comparable to a Mg-rich clinker. Previous work has assured the reliability of the transformation process. The current challenge is to find potential applications as secondary raw material. Recycling of thermally treated asbestos-containing material (named KRY·AS) in traditional ceramics has already been studied with successful results. The results presented here are the outcome of a long termed project started in 2005 and devoted to the recycling of this secondary raw materials in various industrial applications. KRY·AS can be added in medium-high percentages (10-40 wt%) to commercial mixtures for the production of clay bricks, rock-wool glasses for insulation as well as Ca-based frits and glass-ceramics for the production of ceramic tiles. The secondary raw material was also used for the synthesis of two ceramic pigments; a green uvarovite-based pigment [Ca(3)Cr(2)(SiO(4))(3)] and a pink malayaite-based pigment [Ca(Sn,Cr)SiO(5)]. The latter is especially interesting as a substitute for cadmium-based pigments. This work also shows that KRY·AS can replace standard fillers in polypropylene plastics without altering the properties of the final product. For each application, a description and relevant results are presented and discussed.
Gualtieri
Alessandro F
AF
Dipartimento di Scienze della Terra, Università di Modena e R.E., Via S. Eufemia 19, I-41100 Modena, Italy. alessandro.gualtieri@unimore.it
Giacobbe
Carlotta
C
Sardisco
Lorenza
L
Saraceno
Michele
M
Gualtieri
Magdalena Lassinantti
ML
Lusvardi
Gigliola
G
Cavenati
Cinzia
C
Zanatto
Ivano
I
D000538:Aluminum Silicates / Q000737:chemistry; D001194:Asbestos / Q000737:chemistry*; D002516:Ceramics; D000077215:Clay; D004396:Coloring Agents / Q000737:chemistry; D003252:Construction Materials / Q000032:analysis*; D052918:Environmental Restoration and Remediation; D006361:Heating; D007221:Industry; D010969:Plastics / Q000737:chemistry; D059027:Recycling; D018505:Waste Management / Q000379:methods*
D000538:Aluminum Silicates; D004396:Coloring Agents; D010969:Plastics; D001194:Asbestos; D000077215:Clay