Production of materials with alumina and ashes from incineration of chromium tanned leather shavings: environmental and technical aspects.
The leather tannery industry produces a significant amount of solid and hazardous wastes. Chromium-containing wastes like tanned shavings used to be incinerated in order to recover energy. The incineration process generates ashes that must be disposed of. This paper is a report on the results of the evaluation of technological properties and environmental compatibility of products made of alumina and ashes from incinerated chrome tanned shavings. The raw materials, tannery ashes and alumina were mixed together in different proportions. The ceramic bodies were molded using a hydraulic press and fired with a heating rate of 100 K/h until 1400 degrees C for 4 h in a muffle furnace. The ceramic specimens were characterized regarding physical, mechanical and thermal properties. Leaching tests, according to Brazilian, German and Dutch regulations, were performed on ceramic bodies containing different additions of ash. Results show that the ceramic materials produced are acceptable for refractory applications.
Basegio
T
T
Programa de Pós-Graduação em Engenharia de Minas, Metalúrgica e de Materiais, Escola de Engenharia, Universidade Federal do Rio Grande do Sul, Laboratório de Materiais Cerâmicos, Porto Alegre, RS, Brazil. basegio@ufrgs.br
Haas
C
C
Pokorny
A
A
Bernardes
A M
AM
Bergmann
C P
CP
D000537:Aluminum Oxide; D002516:Ceramics; D002857:Chromium; D003247:Conservation of Natural Resources; D017743:Equipment Reuse; D017745:Incineration
D002857:Chromium; D000537:Aluminum Oxide