| http://www.w3.org/ns/prov#value | - her size reduction. [0032] According to one variant, the layer silicate activated with acid is calcined before use, for example at a temperature of about 200 to 400?? C. and optionally ground. [0033] All strong acids can be used in general for acid activation, especially sulfuric acid, phosphoric acid, hydrochloric acid, formic acid and citric acid. [0034] A mineral ac
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