论文部分内容阅读
从含有电解池的半连续浮选机,用于从报纸纸浆中收集油墨。一般情况下,制浆时间过长不利于柔印旧报纸或新闻纸印刷品100%脱墨,但升温有助于脱墨。然而,当施加电场后,延长制浆时间,如从5min到25min,通过测定有效残余油墨浓度(ERIC)百分比变化发现,制浆效率提高了5%。在电场的作用下,温度增加,从25℃到40℃,脱墨效率将提高5%。本文通过以下变量进一步讨论了施加电场对浮选脱墨的影响:碱量(氢氧化钠含量),悬浮物的浓度(纸浆悬浮液固体百分比),非离子表面活性剂和阴离子表面活性剂含量,以及柔印报纸在混合纸浆中的比例。与100%柔印报纸不同,由48%的柔印报纸、30%的胶印报纸和22%旧杂志(OMG)组成的混合废纸中因包含柔印和胶印两种油墨,具有不同的粒径和化学成分,施加电场可使脱墨效率平均提高3%。在氢氧化钠、非离子表面活性剂和阴离子表面活性剂与电场共同作用下,浮选浓度达到1%时脱墨效率最高。通过热重分析(TGA)验证了脱墨效率。根据脱墨选择性参数(即加权系数Z)对脱墨效率进行了讨论。
Semi-continuous flotation machine with cell for collecting ink from newspaper pulp. In general, pulping too long is not conducive to 100% deinking of old flexo or newsprint prints, but warming can help deinking. However, after applying an electric field, the pulping time was extended, such as from 5 min to 25 min, and the pulping efficiency was found to be increased by 5% by measuring the percentage change in effective residual ink concentration (ERIC). Under the action of electric field, the temperature increases, from 25 ℃ to 40 ℃, the deinking efficiency will increase 5%. This article further discusses the effect of applied electric field on flotation deinking by the following variables: base amount (sodium hydroxide content), concentration of suspended solids (percentage of pulp suspension solids), nonionic surfactant and anionic surfactant content, As well as the proportion of flexo newspapers in mixed pulps. Unlike 100% flexo newspapers, mixed waste paper consisting of 48% flexo, 30% offset and 22% back magazines (OMG) contains both flexo and offset inks with different particle sizes And the chemical composition, the application of electric field deinking efficiency can be increased by 3% on average. Under the combined action of sodium hydroxide, nonionic surfactant and anionic surfactant and electric field, the deinking efficiency is the highest when the concentration of flotation reaches 1%. Deinking efficiency was verified by thermogravimetric analysis (TGA). Deinking efficiency is discussed based on the deinking selectivity parameter (ie, the weighting factor Z).