模拟烟气气氛下矿物元素组分对砷的吸附特性研究

利用气相砷吸附反应实验装置，研究了300-900℃条件下CaO、Fe₂O₃、MgO、Al₂O₃、K₂SO₄及钙铁混合吸附剂在模拟烟气气氛下的As₂O₃（g）吸附特性。结果表明，在五种单元素吸附剂中，CaO的吸附能力最强，K₂SO₄最弱；随着温度升高，CaO的吸附量先增加，在700℃时略微下降后又增加，Fe₂O₃的吸附量先增加后减少，MgO、Al₂O₃、K₂SO₄的吸附量一直增加；三种比例的钙铁混合吸附剂的吸附效果的实验值相比计算值至少提高了92%，Ca：Fe比为3：1时，吸附效果最好，达到7.91 mg/g。混合后烧结反应导致表面结构改变是吸附效果提升的重要原因。

Study on arsenic adsorption characteristics by mineral elements in simulated flue gas atmosphere

The adsorption characteristics of As₂O₃(g) by CaO, Fe₂O₃, MgO, Al₂O₃, K₂SO₄ and Ca/Fe mixed adsorbents under the simulated flue gas atmosphere were studied by using a gas phase arsenic adsorption reaction experimental device at temperatures between 300 and 900℃. The results indicate that the adsorption ability of CaO is the strongest among the five single element adsorbents, while K₂SO₄ is the weakest. With the increase of temperature, the adsorption amount of CaO increases first, decreases slightly at 700℃, and then increases, while the adsorption amount of Fe₂O₃ increases first, and then decreases. However, the adsorption amount of MgO, Al₂O₃ and K₂SO₄ increases all the way. Compared with the calculated values of adsorption amounts of Ca/Fe mixed adsorbents in three proportions, the experimental values increase by 92% at least. The adsorption effect is the best when the ratio of CaO to Fe₂O₃ is 3:1. And the change of surface structure caused by sintering reaction after mixing is an important reason for the improvement of the adsorption effect.