Poultices for desalination
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Author: Hans-Jürgen Schwarz
English version by Sandra leithäuser
back to Desalination
| Poultice composition | Advantages | Disadvantages |
| Pure cellulose fibres of different length | - pH-neutral - flexible, soft, adherent - high water absorption |
- low stability - risk of mould formation |
| Bentonite, attapulgit, kaolin, pure or mixed with cellulose | - high water retention capacity - kaolin: in solution almost neutral,hardly any alkali can be mobilised |
- extremely hard when high clay mineral content is present - sometimes increased pH- values - kaolin: risk of white residue on the surface |
| Clays (no further specification) | - high water retention capacity | - extremely hard - sometimes increased pH-values - contamination and soluble proportion unpredictable |
| Newspaper or paper pulp predominantly cellulose/ hemicellulose/ lignin |
- high water absorption | - bleaches, additives and colors could be introduced |
| Cellulose-mixtures with high sand content | - with good quality sands pH-neutral | - properties vary - difficult to process - low stability |
| Clay mineral-cellulose-sand- mixture (different mixtures, commercially available, predominantly on bentonit basis) | - good stability - machine processable - strength and shrinkage can be controlled through composition |
- any mix can become too heavy or too hard - sometimes increased pH-values |
| Clay minerals-light aggregates-mix, sometimes with cellulose | - good stability - machine processable - low shrinkage, low density |
- sometimes increased pH-values - can become too hard, depending on the mix - kaolin: risk of white residue on the surface |