Manganese iron oxide (MnFe₂O₄), an excellent arsenic(As)/antimony(Sb) removal adsorbent, is greatly restricted for the solid-liquid separation. Through the application of superconducting high gradient magnetic separation (HGMS) technique, we herein constructed a facility for the in situ solid-liquid separation of micro-sized MnFe₂O₄ adsorbent in As/Sb removal process. To the relative low initial concentration 50.0 μg L⁻¹, MnFe₂O₄ material sorbent can still decrease As or Sb below US EPA’s drinking water standard limit. The separation of MnFe₂O₄ was mainly relied on the flow rate and the amount of steel wools in the HGMS system. At a flow rate 1 L min⁻¹ and 5% steel wools filling rate, the removal efficacies of As and Sb in natural water with the system were achieved to be 94.6% and 76.8%, respectively. At the meantime, nearly 100% micro-sized MnFe₂O₄ solid in the continuous field was readily to be separated via HGMS system. In a combination with the experiment results and finite element simulation, the separation was seemed to be independent on the magnetic field intensity, and the maximum separation capacities in various conditions were well predicted using the Thomas model (R² = 0.87–0.99).

中文翻译：

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吸附结合超导高梯度磁选技术去除砷和锑

锰铁氧化物（MnFe ₂ O ₄）是一种优异的砷（As）/锑（Sb）去除吸附剂，固液分离受到很大限制。通过应用超导高梯度磁分离（HGMS）技术，我们在本文中构建了一种在As / Sb去除过程中原位固液分离微型MnFe ₂ O ₄吸附剂的设备。相对较低的初始浓度50.0μgL ^-1，MnFe ₂ O ₄材料吸附剂仍可以将As或Sb降低到美国EPA饮用水标准限值以下。MnFe ₂ O ₄的分离主要取决于HGMS系统中的流速和钢丝绒的数量。在1 L min ^-1的流速和5％的钢丝棉填充率下，用该体系去除天然水中的As和Sb的效率分别为94.6％和76.8％。同时，通过HGMS系统可以很容易地分离出连续场中近100％的MnFe ₂ O ₄微米级固体。结合实验结果和有限元模拟，分离似乎与磁场强度无关，并且使用托马斯模型可以很好地预测各种条件下的最大分离能力（R ²  = 0.87-0.99）。