2022/8/26 0:00:00 CHEN Lingchen,SHEN Huiying,LI Bingyun,LEI Yichao,LI Hailong 5true 2022/8/26 0:00:00 YUAN Xiaojun,SUN Xiaoping,WEI Yuhe,ZHU Qiuxiao,WANG Tingting,LUO Lianxin 4true 2+， Cu²⁺， Fe²⁺， Fe³⁺， Mn²⁺ and Mg²⁺ on Fock reactivity of bamboo dissolving pulp were studied. Using acid-alone treatment and then introducing the diethylene triamine pentaacetic acid （DTPA） into the acid treatment to process dissolving pulp， the effects of pH value and DTPA amount on Fock reactivity， ash content， brightness and polymerization degree were investigated. For dissolving pulp， metal ions， especially iron ions， significantly deteriorated the reactivity of bamboo dissolving pulp. Decreasing pH value was beneficial to improve reactivity of bamboo dissolving pulp. In the meantime， the ash content and polymerization degree of bamboo pulp decreased gradually， and the whiteness increased continuously.Under the optimum pH value of 3.0， Fock reactivity increased from 68.3% to 72.7%， while further acid treatment combined with DTPA had very little effect on improving Fock reactivity.]]> 2022/8/26 0:00:00 CHEN Qiuyan,HUANG Liulian 3true 2 were 3.2， 3.4 and 3.5 times higher than those of masson pine chips， respectively. After the mixed cooking of bamboo and masson pine chips with comparison to masson pine chips cooking alone， the amount of knots & rejects increased significantly， and the content of bamboo strips in rejects was very small. Attention should be paid to alkali distribution during different stages of cooking to avoid uneven cooking of wood chips caused by low circulating residual alkali. When bamboo mixed ratio was 20%~30%， the appropriate alkali consumption was 17.8%~18.2% （AA， as Na₂O）， the sulfidity was 26%~30%， the alkali distribution ratios were 15%∶25%~30%∶60%~55% for warm black liquor∶hot black liquor∶cooking， the maximum cooking temperature was 158~160℃， the H factor was 1050~1150， and the Kappa number of the pulp was 35~40. The paper strength properties were insignificantly changed while bamboo chips proportion was within 30%， but the number of PFI rotations decreased obviously at the same beating degree. When running for a long time， it was necessary to increase external displacement of the alkali ash to reduce the enrichment of chloride and potassium ions. The key to high-value-added applications of bamboo pulp was separating pulp into long-fibre and short-fiber fractions by screening.]]> 2022/8/26 0:00:00 LIU Pingyuan,YUAN Zhaobing,ZHOU Kunpeng,XU Yingsheng,QIU Pengfu,ZHOU Jiawei 2true 2022/8/26 0:00:00 CHENG Xinlei,YANG Xuefang,HUANG Liulian,CHEN Lihui,HU Huichao 1true