Nitric-Acid Pulping of Municipal Wastepapers and its Spent-Liquor Utilization for Fertilizers(I) -Study on the Nitric-Acid Pulping Conditions of OCC Pulp-

도시 폐휴지의 질산 펄프제조와 펄프폐액의 입상 비료화 기술개발(I) -폐골판지 상자(OCC)의 질산 펄프제조 조건-

  • 임기표 (전남대학교 농과대학 임산공학과) ;
  • 위승곤 (전남대학교 농과대학 임산공학과) ;
  • 김창래 (전남대학교 농과대학 임산공학과) ;
  • 양정훈 (전남대학교 농과대학 임산공학과)
  • Published : 2000.12.01

Abstract

A series of studies on nitric-acid pulping of municipal recycled waste papers were carried out to substitute the bleached chemical pulp imported for producing printing paper as well as to use its solidified spent-liquor as fertilizer. The first experiment was carried out to find the optimum treatment conditions such as pulp consistency, nitric acid charge and temperature in $HNO_3$-alkali pulping process. The results obtained were as follows: 1. Some selective delignification of OCC pulp was conducted by $HNO_3$-alkali process. The higher the temperature and concentration of nitric acid, the lower the pulp yield and kappa number of treated pulp. while its brightness was increased. 2. The higher consistency required the stronger mixing in case of more than 5% pulp. 3. In the laboratory, the suitable $HNO_3$-treating condition seemed to be less than 6% consistency, lower than 500% $HNO_3$charge on pulp and lower than $100^{\circ}C$ in cooking temperature. 4. The spent liquor with 1.77% N-content seemed to be slow-release nitrogen fertilizer suitable for agriculture.

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References

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