Green liquor dregs and slaker grits residues characterization of a pulp and paper mill for future application on ceramic products

Santos, Verônica Ribeiro dos; Cabrelon, M. D.; Trichês, Eliandra de Sousa; Quinteiro, Eduardo

doi:10.1016/j.jclepro.2019.118220

Cited by 24 publications

(19 citation statements)

References 34 publications

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“…SG is mainly composed of Ca (63.60 wt.%) and Na (5.02 wt.%), presenting a LOI of 41.38 wt.%. The obtained results expressed in terms of oxides are in line with the ones obtained by other authors [ 2 , 11 , 12 , 13 , 14 ].…”

Section: Resultssupporting

confidence: 92%

“…The XRD pattern of SG revealed that the most abundant crystalline phase is calcite (CaCO 3 ), in line with the observations of Santos et al [ 11 ], Siqueira et al [ 12 ], Saeli et al [ 13 , 14 ], and Júnior et al [ 2 ]. Additionally, small amounts of calcium hydroxide (Ca(OH) 2 ) were also detected.…”

Section: Resultssupporting

confidence: 88%

“…Slaker grits (SG) are composed of insoluble particles that are generated at the bottom of the lime slaker during the chemical recovery process in kraft mills. They are a granular residue with a greyish color, high alkalinity, and are mostly composed of CaCO 3 [ 11 ]. It was estimated that 12 kg of SG is generated for each ton of produced cellulose pulp [ 12 ], and it is mostly disposed of in landfills [ 8 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

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Valorization of Kraft Pulp and Paper Mill Slaker Grits and Biomass Fly Ash as Fillers in a Commercial Screed Mortar Formulation

et al. 2022

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Slaker grits (SG) and biomass fly ash (BFA), two waste streams generated in the pulp and paper industry, are commonly disposed of in landfills, a practice with a high economic and environmental burden. In this work, their individual valorization as fillers in a commercial screed mortar formulation was evaluated in order to achieve a more sustainable management practice. The waste streams were characterized in terms of true density, particle size and morphology, and chemical and mineralogical composition. The influence of their incorporation amount (5.0, 7.5, and 10.0 wt.% of the total solids) and pre-treatment (sieving and grinding) on the fresh (workability) and hardened state (density, water absorption by capillarity, and flexural and compressive strength) properties of the mortars were assessed. The results show that the addition of 10.0 wt.% of the SG after milling and sieving (<75 µm) and 7.5 wt.% of BFA in the as-received condition, or up to 10.0 wt.% after grinding and sieving (<63 µm), allowed for the production of mortar samples with properties within the recommended specifications and that were resistant to 25 consecutive freeze-thaw cycles. This waste valorization route could represent an economic benefit of up to 8.85 €/tmortar and 2.87 €/tmortar for mortar, and pulp and paper companies, respectively.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Valorization of Kraft Pulp and Paper Mill Slaker Grits and Biomass Fly Ash as Fillers in a Commercial Screed Mortar Formulation

et al. 2022

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“…This residue can cause negative impact soil contamination and leaching toxic compounds [2]. Solid waste pulp drags contain heavy metals harmful to the environment, such as Cd, Cu and Zn [3]. Green liquor dregs and slaker waste grits can have a negative impact on environment because it is a type of B3 waste (hazardous materials and toxic) which has easy properties flammable, explosive, reactive and corrosive [4].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Solid Waste Pulp Green Liquor Dregs and Slaker Grits for Rooftile Production Application

Tamboesai

2024

KLS

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This study aims to utilize solid waste pulp green liquor dregs and slaker grits by analyzing the effect of adding solid waste green liquor dregs and slaker grits on water absorption and tile compressive strength, analyzing the chemical content of solid waste green liquor pulp dregs and slaker grits and concrete tile products and chemical morphology of the samples. The method used in this research is pressing. The results of the water absorption test for concrete roof tiles with the addition of 0%, 5%, 10%, and 15% solid waste green liquor pulp and slaker grits were 8.4%, 6.4%, 7.5%, and 9.4%. Testing the compressive strength of concrete tiles with the addition of 0%, 5%, 10%, and 15% solid waste green liquor pulp and slaker grits was 19.0 MPa, 19.7 MPa, 18.6 MPa, and 18.3 MPa. The chemical content of solid waste pulp before and after the finished concrete tile product is in accordance with the building blocks of the tile which consists of compounds Al2O3, SiO2, Fe2O3, and CaO. From the above test, it can be concluded that the addition of solid waste pulp can produce quality concrete roof tiles with reference to the value of SNI 0096-2007, that the maximum water absorption value of tile is 10% and the compressive strength of roof tiles is at least 6.0 MPa. Keywords: solid waste, green liquor, slaker grits, rooftile

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“…Dregs are generated in the clarification step of the green liquor in the PPI process and consist of sodium carbonate (Na 2 CO 3 ), calcium carbonate (CaCO 3 ), and sodium sulfide (Na 2 S). Grits are another waste generated in the causticizing step and consist of calcium carbonate (CaCO 3 ), but may also present CaO, Ca(OH) 2 , and Na 2 CO 3 as residual components [22,25]. Both wastes show similarity with the fine limestone aggregates used in several construction materials.…”

Section: Introductionmentioning

confidence: 99%

Sustainability Evaluation of a Paper and Pulp Industrial Waste Incorporation in Bituminous Pavements

Simões,

Rios-Davila,

Paiva

et al. 2024

Applied Sciences

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The valorization of wastes as an alternative or secondary raw material in various products and processes has been a solution for the implementation of sustainability, a safer environment, and the concept of circular economy in the efficient use and management of natural resources. To promote sustainability through a circular economy approach, this work tries to demonstrate the environmental gains that are obtained by bringing together, in an industrial symbiosis action, two large industrial sectors (the pulp and paper and the road pavement sectors) responsible for generating large amounts of wastes. A sustainability assessment, based on a life cycle and circular economy approach, is presented here, and discussed using a simple case study carried out on a real scale. Two wastes (dregs and grits) from the pulp and paper industry (PPI) were used to partially replace natural fine aggregates in the production of bituminous mixtures used on the top surface of road pavements. The impacts at a technical, environmental, economic, and social level were assessed and it was shown that this simple waste valorization action is not only positive for the final product from a technical point of view, but also for the environment, causing positive impacts on the different sustainability dimensions that were evaluated.

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Green liquor dregs and slaker grits residues characterization of a pulp and paper mill for future application on ceramic products

Cited by 24 publications

References 34 publications

Valorization of Kraft Pulp and Paper Mill Slaker Grits and Biomass Fly Ash as Fillers in a Commercial Screed Mortar Formulation

Valorization of Kraft Pulp and Paper Mill Slaker Grits and Biomass Fly Ash as Fillers in a Commercial Screed Mortar Formulation

Utilization of Solid Waste Pulp Green Liquor Dregs and Slaker Grits for Rooftile Production Application

Sustainability Evaluation of a Paper and Pulp Industrial Waste Incorporation in Bituminous Pavements

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