Traduction en anglais : Occurrence, use and possible substitution of quartz.
Silicates constitute approximately 90% of the earth crust.
Silicon dioxide occurs as quartz (crystalline silicic acid) and silicates.
Almost any natural inorganic raw material contains quartz.
As quartz combines a number of unique physical properties, it has become an indispensable raw material for many traditional and high-technology applications.
In many cases substitution is impossible due to technical, financial or logistic reasons.
Wherever substitution is realised however - at least partly - a lower technical performance level and/or higher costs must be accepted, and very often substitution materials with a quartz content>0.1% are used.
There is a large range of industrial and commercial applications of quartz in different substances, preparations and products.
In addition, quartz can be found everywhere in the human environment.
It is well-known that long-term high-level exposure to respirable quartz dust may cause silicosis.
The long-established co-operation between the German Berufsgenossenschaften and the quartz-producing and quartz-processing industry shows that silicosis can be efficiently avoided as long as the applying maximum workplace concentrations (MAK-values) are observed.
Mots-clés Pascal : Quartz, Tectosilicate, Silicate, Matière première, Propriété physique, Substitution, Utilisation, Industrie, Performance, Silicose
Mots-clés Pascal anglais : quartz, framework silicates, silicates, raw materials, physical properties, substitution, utilization, industry
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0143083
Code Inist : 001E01A02. Création : 16/11/1999.