OCC造纸污泥特性的分析

Study on Characteristics of OCC Papermaking Sludge

关键词:  OCC造纸污泥  元素组成  化学特性  热解特性  污泥热值  微观形态

Key Words:waste paper sludge  elements  chemical properties  pyrolysis characteristics  sludge calorific value  morphology

摘要:对OCC造纸污泥中纤维素、半纤维素、木素、蛋白质等有机化学组分的含量进行了分析,并对OCC造纸污泥空气干燥基、灰分、挥发分、固定碳含量进行工业分析；同时对污泥的微观形态、元素组成、结构组成、热解特性、污泥热值等性能进行了研究。结果表明,OCC造纸污泥化学组分中灰分含量为58.84%,纤维素含量为12.9%,半纤维素含量为5.39%,木素含量为3.20%。湿污泥颗粒中位径为35.31 μm左右,热值达14.31 MJ/kg,未检出有毒重金属元素,各种金属离子含量未超标。扫描电子显微镜观察结果表明,OCC造纸污泥结构密实,有机纤维与矿物填料紧密结合。红外光谱分析可知,OCC造纸污泥含有木素、纤维素、半纤维素、蛋白质等固有的醇及酚类的羰基、胺类及亚胺类中的—NH,脂肪族以及羧酸化合物的 C—H、CC,苯环中主要的—C—C等有机物骨架。热重分析结果表明,OCC造纸污泥中的有机物组分在200～450℃分解；无机矿物填料在450～800℃分解,且分别在351.9℃和655℃出现急剧热分解峰,热解特性较明显。

Abstract:The characteristics of OCC papermaking sludge were analyzed, including content of organic matter, cellulose, hemicellulose, lignin, protein, and air dried basis, ash content, volatile points, fixed carbon content. At the same time, the sludge morphology, elemental composition, structure, composition, pyrolysis, sludge calorific value were studied. Results showed that the ash content, fibre content, hemicellulose and lignin content of OCC papermaking sludge were 58.84%, 12.9%, 5.39% and 3.2% respectively. The particle median diameter of wet sludge was about 35.31 μm, the calorific value was 14.31 MJ/kg. No toxic heavy metal elements were detected, and the content of metal ions was not exceeded. SEM results showed that the structure of OCC papermaking sludge was compact, combining organic fiber and mineral filler together. Infrared spectral analysis showed OCC papermaking sludge contained some inherent bonds existing in lignin, cellulose, hemiellulose, protein, such as carbonyl in alcohols and phenols, —NH in amine and imine, C—H and CC in aliphatic and carboxylic acid compound, as well as —C—C benzene. TGA results showed that, organic matter of OCC papermaking sludge decomposed in the temperture of 200~450℃; and the inorganic mineral filler decomposed in the temperture of 450~800℃, and peak thermal decomposition appeared at 351.9℃ and 655℃.