An alternative solution to the silica problem in wheat straw pulping
A Tutus, H Eroglu
article (Uluslararası, Hakemli) | Yazar(lar): A Tutus, H Eroglu | Yıl: 2004 | Dergi/Kurum: APPITA JOURNAL | İndeks: WOS.SCI | Anahtar Kelimeler: wheat straw, silica problem, SOAQ, oxide-added SOAQ pulping — Özet: As a preliminary study, wheat straw pulps were prepared by soda-oxygen-anthraquinone (SOAQ) pulping to inve
As a preliminary study, wheat straw pulps were prepared by soda-oxygen-anthraquinone (SOAQ) pulping to investigate the silica content in pulp and black liquor. The results showed that 88.4% of the silica remained with the pulp in this process. In this study the oxide-added SOAQ pulping process was used to further enhance silica precipitation on pulp by adding 1 to 3% oxide such as Al2O3, CaO and MgO. The results indicated that the optimum oxide-added soda-oxygen-anthraquinone pulping conditions for wheat straw were: alkali charge on o.d. raw material, 16%; anthraquinone (AQ) charge on o.d. raw material, 0.1%; Al2O3 charge on o.d. raw material, 3%; temperature, 140degreesC; time at maximum temperature, 40 min; oxygen pressure, 8 kg/cm(2) (similar to0.79MPa); and liquor-to-straw ratio, 5:1. It was found that the oxide-added SOAQ process increased silica precipitation on pulps by about 9% compare to the SOAQ pulping process. It was concluded that the oxide-added SOAQ process gives the best precipitation of silica onto pulp and also gives good pulp physical and optical properties. The method offers a practical and radical solution to the silica problem.