1 parts of a sludge containing 47 per cent. of moisture; and sludge
of this character has been stated by Vogel to weigh about 22.5 cwt. per
cubic yard.
Experience has shown that those pasty carbide residues can be employed
very satisfactorily, and to the best advantage from the maker's point of
view, by builders and decorators for the preparation of ordinary mortar
or lime-wash. The mortar made from acetylene lime has been found equal in
strength and other properties to mortar compounded from fresh slaked
lime; while the distemper prepared by diluting the sludge has been used
most successfully in all places where a lime-wash is required,
_e.g._, on fruit-trees, on cattle-pens, farm-buildings, factories,
and the "offices" of a residence. Many of the village installations
abroad sell their sludge to builders for the above-mentioned purposes at
such a price that their revenue accounts are materially benefited by the
additional income. The sludge is also found serviceable for softening the
feed-water of steam boilers by the common liming process; although it has
been stated that the material contains certain impurities--notably "fatty
matter"--which becomes hydrolysed by the steam, yielding fatty acids that
act corrosively upon the boiler-plates.
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