The Effects of Polymeric Additives on the Crystallization of Compounds Found in the Evaporator Scales of Australian Sugar Mills (I), Compositions of the Scale Deposits

✍ Scribed by Dr. W. O. S. Doherty; O. L. Crees; Prof. E. Senogles

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 604 KB
• Volume: 28
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170280505

✦ Synopsis

Abstract

The composition of scales formed in multiple evaporator units at three Australian sugar mills have been determined using X‐ray fluorescence (XRF), high performance liquid chromatography (HPLC), X‐ray diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA) and other analytical methods. The composition of the scales formed in each mill have been found to be significantly different and to depend on whether they originated from early or later stages of the evaporation process. Calcium oxalate (present as the di and monohydrate) was identified as a major component of the scales from one mill but was found to be only a minor component of the scales from the other two. The latter were shown to contain two or more forms of calcium phosphate as dominant phases. Amorphous or crystalline silica was found to be present in most of the scales examined.