在流化床反应器中通过结晶回收钡：pH 值、Ba/P 摩尔比和晶种的影响。
Barium recovery by crystallization in a fluidized-bed reactor: effects of pH, Ba/P molar ratio and seed.
机构信息
Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan.
Department of Chemical Engineering, University of the Philippines, Diliman, Quezon City 1101, Philippines.
出版信息
Chemosphere. 2014 Jun;105:100-5. doi: 10.1016/j.chemosphere.2014.01.005. Epub 2014 Jan 23.
The effects of process conditions, including upward velocity inside the column, the amount of added seed and seed size, the pH value of the precipitant or the phosphate stream and the Ba/P molar ratio in a fluidized-bed reactor (FBR) were studied with a view to producing BaHPO₄ crystals of significant size and maximize the removal of barium. XRD were used to identify the products that were collected from the FBR. Experimental results show that an upward velocity of 48 cmmin(-1) produced the largest BaHPO₄ crystals with a size of around 0.84-1.0mm. The addition of seed crystals has no effect on barium removal. The use of a seed of a size in the ranges unseeded<0.149-0.29 mm<0.149 mm<0.29-0.42 mm produced increasing amounts of increasingly large crystals. The largest BaHPO₄ crystals were obtained at pH 8.4-8.8 with a Ba/P molar ratio of 1.0. In the homogeneous and heterogeneous processes, around 98% of barium was removed at pH 8.4-8.6 and [Ba]/[P]=1.0. The XRD results show that a significant amount of barium phosphate (Ba₃(PO₄)₂) was obtained at pH 11. The compounds BaHPO₄ and BaO were present at a pH of below 10.
研究了包括柱内上升速度、添加晶种量和晶种大小、沉淀剂或磷酸盐流的 pH 值以及流化床反应器 (FBR) 中 Ba/P 摩尔比在内的工艺条件对生成具有显著尺寸的 BaHPO₄ 晶体并最大程度去除钡的影响。使用 XRD 来鉴定从 FBR 收集的产物。实验结果表明，48 cmmin(-1)的上升速度产生了最大的 BaHPO₄ 晶体，其尺寸约为 0.84-1.0mm。添加晶种对钡去除没有影响。使用未添加晶种<0.149-0.29 mm<0.149 mm<0.29-0.42 mm 范围内的晶种的大小对晶体的大小没有影响。在 pH 值为 8.4-8.8 且 Ba/P 摩尔比为 1.0 时，获得了最大的 BaHPO₄ 晶体。在均相和多相过程中，在 pH 值为 8.4-8.6 且[Ba]/[P]=1.0 时，约 98%的钡被去除。XRD 结果表明，在 pH 值为 11 时获得了相当数量的磷酸钡（Ba₃(PO₄)₂）。在 pH 值低于 10 时存在 BaHPO₄ 和 BaO 化合物。
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