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	<title>Pulp and Paper Circle &#187; Bleach plant scaling</title>
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	<link>http://pulpandpapercircle.com</link>
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		<title>Barium sulphate scaling in the bleach plant</title>
		<link>http://pulpandpapercircle.com/2007/05/barium-sulphate-scaling-in-the-bleach-plant/</link>
		<comments>http://pulpandpapercircle.com/2007/05/barium-sulphate-scaling-in-the-bleach-plant/#comments</comments>
		<pubDate>Sun, 13 May 2007 17:39:54 +0000</pubDate>
		<dc:creator>Roxare</dc:creator>
				<category><![CDATA[Bleach plant scaling]]></category>

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		<description><![CDATA[Barium sulphate is another problematic scale in the bleach plant. Barium enters the mill with wood/bark (especially hardwood) and water. Barium scaling depends on the kappa number, the pH and the concentration of Ba and SO4 in the bleaching stage. The problem of BaSO4 scaling has been observed when switching from chlorine to ECF bleaching. [...]]]></description>
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		<title>Oxalate scaling</title>
		<link>http://pulpandpapercircle.com/2007/04/oxalate-scaling/</link>
		<comments>http://pulpandpapercircle.com/2007/04/oxalate-scaling/#comments</comments>
		<pubDate>Sun, 29 Apr 2007 15:53:32 +0000</pubDate>
		<dc:creator>Roxare</dc:creator>
				<category><![CDATA[Bleach plant scaling]]></category>
		<category><![CDATA[Evaporator scaling]]></category>

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		<description><![CDATA[In a kraft mill, large amounts of oxalate ions [C2O4]-2, are formed in oxygen delignification, as well as in the D, Z and, to a lesser extent, in the E and P stages in bleaching. In the bleach plant, CaC2O4 scales can form in the acid stage. CaC2O4 solubility depends on the concentration of the [...]]]></description>
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		<title>Calcium carbonate scaling</title>
		<link>http://pulpandpapercircle.com/2007/04/calcium-carbonate-scaling/</link>
		<comments>http://pulpandpapercircle.com/2007/04/calcium-carbonate-scaling/#comments</comments>
		<pubDate>Sat, 14 Apr 2007 20:06:17 +0000</pubDate>
		<dc:creator>Roxare</dc:creator>
				<category><![CDATA[Bleach plant scaling]]></category>
		<category><![CDATA[Evaporator scaling]]></category>

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		<description><![CDATA[Calcium contributes to scaling in various operations in a pulp and paper mill. CaCO3 is water insoluble, and has inverse solubility with temperature. Consequently, it forms on heat transfer surfaces such as digester heaters and black liquor evaporators. CaCO3 scales are also seasonal, and not easy to deal with. Calcium enters the mill through wood/ [...]]]></description>
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