Pitch adsorption on natural and modified talcs



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Tijero Cruz, Antonio and Monte Lara, M. Concepción and Blanco Suárez, Ángeles and Negro Álvarez, Carlos and Tijero Miquel, Julio (2009) Pitch adsorption on natural and modified talcs. Journal of Pulp and Paper Science, 35 (3-4). pp. 130-136. ISSN 0826-6220

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Official URL: http://www.tappi.org/Bookstore/Technical-Papers/Journal-Articles/Archive/JPPS.aspx


Talc is used traditionally for pitch control in papermaking. The effectiveness of talcs as control agent of dissolved and colloidal pitch depends on its structural and surface characteristics of minerals. Talcs are modified by thermal and surface treatments to obtain different properties e.g specific surface, surface energy, surface charge and ratio lypophilic/hydrophilic surface.

Five commercial talcs have been tested to determine its capacity to adsorb the lypophilic contaminants by experiments of adsorption isotherms. The talcs correspond to two groups of different mineralogical compositions: one with high concentration of talc and some dolomite; and the other, with medium concentrations of talc and chlorite.

Colloidal dispersions of extractives were obtained by extraction of Eucalyptus globulus wood at pilot plant scale with acetone, evaporation of the solvent and reextraction with hexane to increase the selectivity of lypophillic compound extraction.

The isotherms of adsorption of the pitch dispersions were carried out at 50ºC on the different talcs. The adsorption took place by a mechanism of colloidal adsorption and the results obtained were adjusted to the Langmuir equation.

Results show that talc addition to bleaching waters or process waters can produce high reductions of colloidal pitch concentrations, at comparatively low doses.

Item Type:Article
Uncontrolled Keywords:Talc, modified talc, pitch, pitch control, wood extractives
Subjects:Sciences > Chemistry > Paper industry
Sciences > Chemistry > Chemical engineering
ID Code:34431
Deposited On:27 Nov 2015 12:22
Last Modified:07 Dec 2015 15:53

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