Raw materials sheet sizes Quality (standard) - Wehrhahn
Raw materials sheet sizes Quality (standard) - Wehrhahn
Raw materials sheet sizes Quality (standard) - Wehrhahn
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14 b | <strong>Raw</strong> Materials <strong>Quality</strong><br />
SAnD<br />
SiO2 > 75 %<br />
Al2O 3 < 10 %<br />
Fe2O3 < 3 %<br />
caO < 5 %<br />
MgO < 2 %<br />
na2O + K2O < 2 %<br />
SO3 < 3 %<br />
Loss on ignition < 5 %<br />
chloride < 0,05 %<br />
Silt (volume) < 3 %<br />
ceMent<br />
Portland Zement<br />
tricalcium Silicate<br />
c3S<br />
> 50 %<br />
calcium Aluminate<br />
c3A 7 – 10 %<br />
calcium Aluminoferrite<br />
c2 (A,F)<br />
< 10 %<br />
Spec. Surface (cm²/g) 3200 – 4500 blaine<br />
na2O + K2O < 1 %<br />
ADDitiVeS<br />
Flocculants in industrial <strong>standard</strong>s<br />
Defoamer<br />
FreSh WAter (= Plant Feeding Water)<br />
Drinking or ground water.<br />
for ccA <strong>sheet</strong>s only<br />
ALuMinAteS<br />
Aluminium trihydroxide 80 - 90 %<br />
Water 10 - 20 %<br />
Sodium Monoxide < 0,5<br />
Density kg/m 3 2.400<br />
Solid powder, free flowing crystalline<br />
Synthetic FibreS<br />
for cc <strong>sheet</strong>s only<br />
PVA = Poly-Vinyl-Alcohol<br />
Fibre length (mm) 4 - 6<br />
Fibre strength (km)<br />
27 - 54<br />
[ZSt (Pulmac km wet) Pulmac]<br />
and/or<br />
PAn = Poly-Acryl-nitril<br />
Fibre length (mm) 4 - 6<br />
Fibre strength (km)<br />
23 - 25<br />
[ZSt (Pulmac km wet) Pulmac]<br />
Details to be discussed.<br />
VAriAtiOn OF rAW MAteriALS<br />
ceLLuLOSe<br />
a) ccA <strong>sheet</strong>s<br />
-> unbleached softwood Kappa number:<br />
23 to 29<br />
Kraft pulp<br />
pref. radiata Pine<br />
refined properties:<br />
Freeness 500 - 650 cSF<br />
dissolved<br />
300 - 500 cSF<br />
refined<br />
Fibre length (mm) 2,6 - 2,7<br />
Fibre strength (km)<br />
> 11<br />
[ZSt (Pulmac km wet) Pulmac]<br />
b) cc <strong>sheet</strong>s<br />
-> bleached softwood<br />
Kraft pulp<br />
<strong>Quality</strong> as close to the<br />
specifications for unbleached<br />
quality as possible.<br />
Details to be discussed.<br />
Above basic requirements for raw material qualities are ideal figures. raw <strong>materials</strong> may vary from these<br />
figures, but still marketable Fibre cement can be produced. the final basic data, layout and the equipment<br />
to be used should then be further discussed.
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