Experimental Results for the Settling Behaviour of Particle-Fiber Mixtures
Experimental Results for the Settling Behaviour of Particle-Fiber Mixtures
复制标题
颗粒纤维混合物沉降行为的实验结果
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Schabel
中科院分区：
文献类型：
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作者：
M. Feist;H. Nirschl;J. Wagner;G. Hirsch;S. Schabel
有机纤维和无机颗粒的沉积可以在几个工业应用中观察到。纤维不仅用于废水处理，还用于其他分离应用。在造纸工业中，从短纤维素纤维中分离无机填料和涂料颗粒仍然是回收过程中的一个挑战。在该过程中，必须去除颗粒以获得纯化的纤维悬浮液。这些纤维可以再次用于生产新的纸张。目前采用的筛分、浮选等工艺，短纤维的分选效果很差。此外，由于重的小颗粒和轻的较大纤维的沉降速度相似，通过沉降的分离也失败了。本文着重研究了水中有机纤维和无机颗粒的沉降。调查的悬浮液是通过解决两个不同的和专门生产的纸张涂层和未涂层的，以及用于其生产的单一组分。根据悬浮液中纤维和颗粒的浓度以及pH值的不同，我们观察到不同的沉降行为，主要结果是，根据纤维率，沉降行为是颗粒主导的或纤维主导的。
Sedimentation of organic fibres and inorganic particles can be observed in several industrial applications. Fibres are involved not only in wastewater treatment but also in other separation applications. In the paper industry, the separation of inorganic filler and coating particles from short cellulose fibres is still a challenge in the recycling process. During that process, particles have to be removed to obtain a purified fibre suspension. These fibres can be used again to produce new paper. With the currently applied techniques, like screening and flotation, the efficiency of short fibre separation is very poor. Moreover, also separation by sedimentation fails due to similar settling velocities of heavy-small particles and the light and larger fibres. This paper concentrates on the sedimentation of organic fibres and inorganic particles in water. The investigated suspensions are made by resolving two different and specially produced papers a coated and an uncoated one, as well as the single components used for its production. We observe a different sedimentation behaviour according to the concentration of fibres and particles in the suspension and the pH-value of it. The main result is that, according to the fibre rate, the sedimentation behaviour is particle dominant or fibre dominant.