Abstract
Continuing the first part on this subject, the results of precipitation experiments are described by the example of the removal of humic acid and lignosulphonic acid. Moreover, to increase the number of process variants and in accordance with process methods after Haberer, there is proposed a two‐stage chemical treatment, inter alia. According to the latest findings, already at the first stage a metallic salt dosing should be done, so that the purification effect can be improved. This new technique, termed “combination stage flocculation”, is based on new findings concerning the solubility behaviour of aluminium compounds at higher pH‐values in the presence of magnesium salts, when slightly soluble aluminium‐magnesium double hydroxides originate.
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