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首页> 外文期刊>Monatsschrift fur Brauwissenschaft >Heat treatment of kieselguhr in order to improve filtration properties and for recycling
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Heat treatment of kieselguhr in order to improve filtration properties and for recycling

机译：硅藻土的热处理，以提高过滤性能和回收利用

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The heat treatment for the recycling of used kieselguhr from deep bed filtration at 500℃ for 120 minutes in the presence of water vapor improves the filtration properties of the recycled kieselguhr. The cumulative increase in pressure across the filter bed of the pilot filter as a parameter for the maximum duration of filtration rose more gradually over time. The total amount of filtration time increases, therefore reducing filter down time. The turbidity, as a measure of filtration precision, does not increase. The water value and the permeability both increase with heat treatment. The particle size distribution indicates that structural changes were uncommon as a result of heat treatment. The specific surface area and the pore volume of the kieselguhr was reduced one third and the pore surface area, by 70%. Additionally, the average pore diameter was almost doubled. The more decrease in filtration pressure, together with the higher values for turbidity both resulted from a change in pore size and a reduction in the adsorptive characteristics of the particles due to the heating process. Heat treatment presumably caused a reduction in smaller pores. Only the larger pores remained open, which lowered the resistance of the filter bed, increasing the flow rate through it. As a consequence, the filter bed compressed more slowly, which resulted in a more gradual pressure increase during filtration. Measuring the flow and the zeta potential, the amount of specific charge all prove that the adsorptive properties of the particles were reduced because of their diminished surface area and their reduction in surface area charge.
机译：在水蒸气存在下于500℃进行深床过滤120分钟以回收利用的硅藻土的热处理提高了回收的硅藻土的过滤性能。作为最大过滤持续时间的参数，引导过滤器滤床两端的压力累积增加随时间逐渐增加。过滤时间总量增加，因此减少了过滤器停机时间。作为测量过滤精度的浊度不会增加。水值和渗透率均随热处理而增加。粒度分布表明，热处理不会引起结构变化。硅藻土的比表面积和孔体积减少了三分之一，孔表面积减少了70％。另外，平均孔径几乎增加了一倍。过滤压力的降低越多，浊度值越高，这都归因于孔径的变化和由于加热过程导致的颗粒吸附特性的降低。热处理可能会减少小孔。只有较大的孔保持开放，这降低了滤床的阻力，从而增加了通过滤床的流速。结果，滤床压缩得更慢，这导致在过滤过程中压力逐渐增加。通过测量流量和ζ电势，比电荷的量全部证明了颗粒的吸附性能由于其表面积减小和表面积电荷的减少而降低。

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