| Identification and Control of Pitch in the Final Product of the Eucalyptus Pulp Production Line |
| Received:August 29, 2025 Click here to download the full text |
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| Author Name | Affiliation | | Otth Edison Humberto Durán | 1Arauco and Constitution Pulp Inc, Santiago, F3 00000, Chile | | de Azevedo Vítor Orçai | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil | | de Moura Gabriella Almeida | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil | | de Carvalho Bittencourt Ricardo | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil | | de Almeida Jaqueline Maria | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil | | de Oliveira Rubens Chaves | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil | | Costa Marcelo Moreira da* | 2Department of Forestry Engineering, Federal University of Vi?osa, Vi?osa, Minas Gerais, 36570-900, Brazil |
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| Abstract:This study evaluated the agglomerating effect of aluminum on substances in weak black liquor from eucalyptus pulp washing, as well as its contribution to the formation of inorganic deposits. The addition of aluminum sulfate led to an increase in the levels of silica and magnesium, which were the major components of the resulting inorganic solids (termed "artificial pitch"). The artificial pitch closely resembled the historical deposits from a filtrate tank during normal operation (referred to as Event 1), thereby validating its suitability as a representative model. The deposits from Event 2, which occurred six years later, exhibited higher metal concentrations. This was attributed to delays in maintenance following a major earthquake. A parallel laboratory study was conducted to test the coagulant ECO 1024. It was found that this coagulant reduced the residual aluminum in mill water by 42%, and it was projected to result in annual savings of US$117,420. The results confirmed that aluminum played a role in promoting the agglomeration of silica and magnesium, which in turn contributed to the buildup of deposits, particularly under stable operating conditions. Moreover, ECO 1024 proved to be effective in mitigating the challenges associated with aluminum, offering both technical and economic advantages for optimizing pulp washing processes. |
| keywords:aluminum artificial pitch eucalyptus pulp washing |
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