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Content archived on 2024-05-07

Characterisation and control of colloids in paper mills recycling wastepaper

Objective



Wastepaper is in Europe one of the main sources of fibres for paper and board production. Wastepaper is made up of components which can be used to produce paper and contaminants which must be removed. Some of them are present as relatively large solids and can be removed by screening or cleaning. Others are finely dispersed and are called dissolved and colloidal materials (DCM). These DCM cannot be removed by conventional mechanical processes and are generally directly responsible for deposits on the paper machine clothing or indirectly by reagglomeration inducing spots on the paper sheet (secondary stickies).

In order to improve the wastepaper recycling process, the objective of this research project is to characterise DCM from various origins in process water of mills producing various grades of papers and to compare the different solutions for the removal of these components. Firstly, common test methods will be developed in order to identify the main sources of DCM produced in the recycling process. The DCM will be characterised regarding their properties and their detrimental effects on process and paper quality. Various control techniques will be investigated regarding their efficiency, incidence on yield (fibre and usable materials loss), investment and operating costs. Both techniques already developed in recycling mills (anionic trash catchers, dissolved air flotation) and techniques not already used for this purpose in the paper industry (microfiltration, ultrafiltration and electroflotation) will be evaluated, each one under the responsibility of one of the Partners (4 Research Institutes or Universities). Adapted chemicals will be proposed by the chemical supplier. For the main sources of DCM already identified and the main paper mill conditions, the various solutions will be compared in order to propose the most efficient and cost effective solutions. The more promising solutions will be evaluated in a continuous process in the small-scale pilot plant facilities of one of the partner. Full-scale trials wil1 then be performed in the mills of the industrial partners.

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Topic(s)

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Call for proposal

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Funding Scheme

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Coordinator

Centre Technique de l'Industrie des Papiers, Cartons et Celluloses
EU contribution
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Address
Domaine Universitaire
38044 Grenoble
France

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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

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Participants (2)

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