试剂
氟化物
过饱和度
废水
流化床
化学
氟化氢
材料科学
结晶
制浆造纸工业
废物管理
化学工程
无机化学
有机化学
工程类
作者
Kris Van den Broeck,N. Van Hoornick,Jan Van Hoeymissen,Rudolf A. de Boer,Andreas Giesen,D. Wilms
出处
期刊:IEEE Transactions on Semiconductor Manufacturing
[Institute of Electrical and Electronics Engineers]
日期:2003-08-01
卷期号:16 (3): 423-428
被引量:31
标识
DOI:10.1109/tsm.2003.815624
摘要
Within the semiconductor industry, large volumes of hydrogen fluoride (HF) containing wastewaters need to be treated. This paper describes a technique that makes it possible to treat HF wastewater with virtually no waste production. A method based on crystallization of CaF/sub 2/ on sand particles in a fluidized bed reactor, with trade name Crystalactor, was assessed for the first time with real wastewater originating from a semiconductor prototyping line. Several process parameters were investigated such as influent fluoride concentration, calcium reagent excess, pH, single versus multiple calcium reagent dosing, etc. It can be concluded that the performance of the reactor is greatly dependent on the initial concentrations of calcium and fluoride at the bottom of the reactor (referred to as local saturation). The original hardware design was changed from a single reagent dosing to a multiple reagent dosing to prevent too high local supersaturation values of fluoride and calcium and thus obtain higher CaF/sub 2/ crystallization efficiencies. Fluoride loads up to 7 kg/m/sup 2//spl middot/h were still possible with multiple reagent dosing, compared to a maximum treatable load of 3.5 kg/m/sup 2//spl middot/h for single reagent dose. Additionally, an alternative post-treatment process based on replacement of calcite by fluorite in a granular calcite column is demonstrated.
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