Carbonizing of wool

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Wool carbonising


Wool carbonising.jpg


Typical parameters of the process


Techniques Temperature [°C] Pressure (bar) Heat transfer medium Residence Time Additional information Literature:
soaking 20-30 2 - 3 h solution containing 6 – 8- % of mineral acid (generally sulphuric acid), 1-2 g/l detergent wool carbonising
pressing/centrifugation (ev. Hydro-extraction) until 5 – 7,5 % of sulphuric acid and 50 – 65 % of water remain
drying 65 – 90
baking 105 – 130 drying + baking ~ 1 h
crush embrittled vegetable matter (VM) heavy fluted rollers
remove charred VM dust rotating shaker/de-duster
neutralising bowl containing sodium carbonate
Rinsing small addition of detergent
Bleaching with hydrogen peroxide at approximately pH 5 with formic acid
final drying


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