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Q: How to remove Calcium sulfate scale ( No Answer,   4 Comments )
Subject: How to remove Calcium sulfate scale
Category: Science > Chemistry
Asked by: colex-ga
List Price: $3.00
Posted: 18 Oct 2002 18:38 PDT
Expires: 17 Nov 2002 17:38 PST
Question ID: 83281
We are using chemicals to feed into cooling water system; however,
Calcium sulfate scale will arise around the tube side of heat
exchanger.  The material of the tube is copper or carbon steel shell. 
As Calcium sulfate scale is very rigid to remove cleanly, if anyone
could offer effective method to resolve the said scale problem.
There is no answer at this time.

Subject: Re: How to remove Calcium sulfate scale
From: denco-ga on 18 Oct 2002 19:02 PDT

(a page about sugar processing) seems to indicate that
hot sugar water ("juice") might do the trick:

"Calcium sulfate has a quite high solubility in hot water
and juice ..."

Search: "removing calcium sulfate"

Subject: Re: How to remove Calcium sulfate scale
From: blanketpower-ga on 20 Oct 2002 02:10 PDT
Very common industrial problem. Most inhibitors are phosphorus-based,
and one-shot cleanouts tend to be EDTA-based. Suggest that you contact
NALCO ... they are usually more than happy to help, and have a variety
of products on the market for just this type of application. (I work
in mining.. no stranger to this problem).

CHeck out
Subject: Re: How to remove Calcium sulfate scale
From: ziffielou-ga on 02 Nov 2002 06:02 PST
Hot one Normal sulfuric acid.
Subject: Re: How to remove Calcium sulfate scale
From: corroman-ga on 11 Feb 2003 22:50 PST
For removing calcium sulfate and other water-borne scales, from MS and
copper surfaces, CITRIC ACID SOULTION will be more beneficial then
other acids, as it is less corrosive.

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