The manufacture of alum and the sulphates and other salts of alumina and iron; their uses and applications as mordants in dyeing and calico printing, and their other applications in the arts, manufactures, sanitary engineering, agriculture, and horticulture (1901)
Geschwind, Lucien, Salter, Charles Thomas · London, Scott, Greenwood & son; New York, D. Van Nostrand co. [etc., etc.] · leaf 237
working up into alum by the addition of ammonium sulphate. The crystals are taken out by shifts of four men and trans- FIG. 135. — Longitudinal section (CD) of washing tank (turbine). ferred to a square receptacle fitted with a false bottom, on which a layer of brushwood is placed (Figs. 135 to… … FIG. 136. — Transverse section of turbine. the real hydro-extractors are better. The crystals are washed with a saturated solution of ferrous sulphate, and left to drain for 1 2 hours : in this way they are gradually purged of aluminous mother liquor, and are soon ready for storage.
Alum · Sulphates · Dyes and dyeing · Chemistry, Technical
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