Improvement of ink and heavy metal removal from old corrugated container stock by alkali kneading

Byoung-Uk Cho; Jeong-Yong Ryu; Bong-Keun Song

Journal of Industrial and Engineering Chemistry, Vol.18, No.2, 697-701, March, 2012

DOI10.1016/j.jiec.2011.11.135 Export Citation

Improvement of ink and heavy metal removal from old corrugated container stock by alkali kneading

Byoung-Uk Cho, Jeong-Yong Ryu^{1, †}, and Bong-Keun Song¹

Dept. of Paper Science & Engineering, Kangwon National University, Chuncheon, Gangwon-do, 200-701, Republic of Korea
¹Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 305-600, Republic of Korea

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One of the possible ways to strengthen competitiveness of Kraft paper industry is to replace the expensive virgin unbleached kraft pulp (UKP) with old corrugated container (OCC), a cheaper and lower grade raw material. When OCC is utilized to produce kraft paper, the main problems are the impaired appearance of the products, and heavy metals and hazardous materials in the products caused by the printed ink and other contaminants. In order to improve the removal efficiency of ink and heavy metals from old corrugated container stock, the effect of adding alkali during kneading of OCC stock was investigated. It was found that adding NaOH and sodium silicate during kneading could improve detachment of ink from fiber surface and removal of it from stock and hence improve heavy metal removal from OCC stock. Since alkali addition improves ink detachment, effective residual ink concentration (ERIC) of pulp was decreased and brightness was increased. Tensile strength and tensile energy absorption (TEA) were increased with addition of alkali.

Keywords:Old corrugated container;Recycling;Kneading;Alkali;Heavy metals

[References]

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Freeland SA, Hrutfiord BF, TAPPI J., 77(4), 185 (1994)

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[1] Meinander PO, in: Gullichsen J, Paulapurom H (Eds.), Papermaking Science and Technology, Book 18, Fapet Oy, Helsinky, 121 (2000)

[2] Minor JL, Atalla RH, in: Rowell RM, Laufenberg TL, Rowell JK (Eds.), Proc. Mat. Res. Soc. Symp., 266, San Francico, USA, 215 (1992)

[3] Nazhad MM, J. Ind. Eng. Chem., 11(3), 314 (2005)

[4] Hubbe MA, Venditti RA, Rojas OJ, Bioresources., 2, 739 (2007)

[5] European Parliament and Council Directive 94/62/EC of 20 Dec. (1994)

[6] Kim JW, Lee HL, Lee WJ, Seo JH, Proc. Spring Conf. Korea, TAPPI, Seoul, South Korea, 158 (2008)

[7] Kim JW, Seo JH, Youn HJ, Lee HL, J. Korea TAPPI., 41(2), 55 (2009)

[8] Wirojanagud W, Tantemsapya N, Tantriratna P, Songklanakarin, J. Sci. Technol., 26, 45 (2004)

[9] Vieira M, Tavares CR, Bergamasco R, Petrus JCC, J. Membr. Sci., 194(2), 273 (2001)

[10] Nurmesniemi H, Po¨ykio¨R , Pera¨ma¨ki P, Kuokkanen T, Chemosphere., 61, 1475 (2005)

[11] McCool MA, in: Spangenberg RJ (Ed.), Secondary Fiber Recycling, TAPPI Press, Atlanta, USA, 141 (1993)

[12] Cho BU, Ryu JY, Song BK, J. Korea TAPPI., 40(5), 27 (2008)

[13] Turvey RW, in: Mckinney RWJ (Ed.), Technology of Paper Recycling, Blackie Academic and Professional, Glasgow, UK, 130 (1995)

[14] Dennis JK, Such TE, Nichel and Chromium Plating, 3rd ed., Woodhead Publishing, Cambridge (1993)

[15] Eriksson E, Sjostrom E, TAPPI J., 51, 56 (1968)

[16] Katz S, Liebergott N, Scallan AM, TAPPI J., 64, 97 (1981)

[17] Scallan AM, TAPPI J., 66(11), 73 (1983)

[18] Freeland SA, Hrutfiord BF, TAPPI J., 77(4), 185 (1994)