Mercury Removal by Adsorption on Pectin Extracted from Sugar Beet Pulp: Optimization by Response Surface Methodology

Considering the rich sugar beet resource in Xinjiang, China, the possibilities for Hg(II) removal by pectin extracted from sugar beet pulp and optimization of the extraction process using response surface methodology (RSM) were studied. The experiments were proposed by Box‐Behnken design (BBD) and a second‐order regression model was developed for regression analysis and analysis of variance. Optimized conditions in terms of temperature, concentration, and solid‐liquid ratio were determined. The effects of different parameters like pH, time, temperature, and initial Hg(II) concentration on adsorption capacity were investigated. The isotherm adsorption experiments were fitted with the Langmuir model which indicated monolayer adsorption.     

生产竹胶粘浆粕的实践和探讨

该文对竹类的生长和化学组成及其竹纤维特性进行分析，并结合南纸公司竹粘胶浆粕生产实际对竹粘胶浆粕制浆工艺、操作要点进行技术总结。     

Batch and continuous studies on treatment of pulp mill wastewater by Aeromonas formicans

Batch and continuous studies have been conducted on the treatment of black liquor from a kraft pulp and paper mill by a bacterial strain, Aeromonas formicans. The results of batch studies revealed that the strain was able to remove 71% and 78% of COD and lignin respectively, while the colour removal efficiency was around 86% in 10 days of retention time. The analysis of lignin degradation products by gas chromatography after 20 days of incubation revealed the formation of some phenolic acids, which were responsible for the decrease in pH during batch studies. The removal efficiencies of COD, colour and lignin obtained in continuous reactor studies were 73, 88 and 77% respectively for an 8 day detention period and these efficiencies were almost the same as obtained in batch studies. © 2001 Society of Chemical Industry     

Electrochemical bleaching of kraft bagasse pulp using a new cell design

In situ single‐stage electrochemical bleaching of kraft bagasse pulp was carried out in a cylindrical agitated vessel fitted with four graphite rod anodes and a cylindrical stainless steel screen cathode, using NaCl as an electrolyte. The effect of current density, pH, NaCl concentration, impeller rotational speed, temperature, and pulp consistency on the rate of bleaching was studied. It was found that the rate of bleaching increased with increasing current density, NaCl concentration, and temperature and decreased with increasing pH and pulp consistency. The effect of temperature was found to fit Arrhenius equation with an activation energy of 0.515 kcal/mol, which denotes a diffusion‐controlled mechanism. Energy consumption (EC) calculation showed that EC ranged from 0.225 to 3.11 kWh/kg dry pulp depending on the current density. The strength of bleached pulp was little affected by bleaching lying within an acceptable range.     

大麻全杆化机浆H2O2漂白

大麻全杆化机浆经Ｈ２Ｏ２单段漂白后，其白度和物理强度明显增加，达到二号凸版纸标准，漂白纤维变得更柔软，纤维表面变得更整洁，主要发色基因双键和共轭羰基被破坏，芳族邻羟基酮和聚木糖Ｃ＝０键及甲氧基等被消除．     

不同的漂剂对红麻磺化化学机械浆色度的影响

应用一种新颖的方法，研究了不同的漂剂对红麻磺化化机浆（ＳＣＭＰ）的颜色或色调的影响。结果表明，就去除纸浆的黄色调而言，ＮａＢＨ＿４和Ｈ＿２Ｏ＿２漂白是非常有效的，而效果以ＮａＢＨ＿４为最佳。ＣＨ＿３ＣＯＯＯＨ漂白浆的黄色调较深，而Ｈ＿２Ｏ＿２两段漂能获得比Ｈ＿２Ｏ＿２单段漂较浅黄色调的纸浆。     

红麻半化学浆试制牛皮箱纸板

本文论述了在实验室对红麻全杆及芯杆分别试制牛皮箱纸板的研究．研究结果表明：红麻全杆及芯杆经适宜的化学方法和工艺条件处理后，经高浓磨浆制得的半化学浆以不同的配比代替本色木浆挂面，试制的牛皮箱纸板各项技术指标均可达到国家标准要求．     

由龙头汪金矿硫精砂中综合回收金银铜的研究

研究探讨了从硫精矿中综合回收金银铜的途径．确定了最易实现工业化的浮选流程。在原硫精矿害Cu、Au、Ag、S分别为0．67%、5．01g／t、17．23g／t、35．17%的情况下，经氧化浮选后，可获得铜金精矿；βCu=15．59％．βAu=112g／t．βAg=210g／t，εCu=77．74%，εAu=40.72%，浮选尾矿中βs=35．42%，εs=97．31%，可作为硫精矿出售。     

紫穗槐碱法纸浆的漂白性能研究

紫穗槐烧碱—蒽醌浆的实验室漂白的研究表明,其白度可达到生产一般书写纸和有光纸的要求。采用常规次氯酸盐单段或次氯酸盐两段漂白,白度能达到66—70°。研究中发现,碱法紫穗槐浆的硬度对漂白的影响最大,当硬度为高锰酸钾值14～16时,其漂率相当于麦草浆的漂率。研究中还发现,选用HA—P(次氯酸盐/酸处理—过氧化氢)法漂白时,也能获得较好的白度。     

亚铵法制浆蒸煮过程中蒸球缓蚀剂的研究

本文通过电化学和失重法正交筛选实验,得出(NH_4)_3PO_4为亚铵法制浆过程蒸球的有效缓蚀剂,并对其缓蚀机理进行了探讨。实验表明,磷酸铵为一种阳极钝化型缓蚀剂,它在亚铵蒸煮过程中的缓蚀率可达88.1％,能使体系的腐蚀率下降到0.1mm/Y。在蒸煮液中有Ca~(2+)、Mg~(2+)、Fe~(2+)等二价阳离子存在的条件下,磷酸根离子与其形成难溶性沉淀物,抑制了碳钢表面的阳极溶解反应,减缓了蒸球的腐蚀。本文还利用现代表面分析手段对加入磷酸铵后碳钢表面形成的保护膜进行了分析测定,并用电化学方法研究了温度、pH值对加入(NH_4)_3PO_4缓蚀剂前后腐蚀电流的影响。最后通过对纸浆物检性能的测定,证明(NH_4)_3PO_4缓蚀剂的加入对纸浆性能没有显著影响。