稀土尾矿基沸石陶粒的制备与应用研究
发布时间：2018-07-16 10:48
【摘要】：内蒙古自治区稀土储量巨大,开采过程中产生了大量稀土尾矿。稀土尾矿资源化利用关系到内蒙古自治区的生态友好型和资源节约型社会的建设,因此为稀土尾矿开发适宜的资源化利用方法成为目前亟待解决的问题。本文利用建筑垃圾和稀土尾矿烧制陶粒,并对其进行沸石化处理,再进一步对其进行负载,目的在于:改善建筑垃圾和稀土尾矿带来的环境问题;开发以建筑垃圾和稀土尾矿为主要材料的高效吸附材料。主要研究如下:(1)添加稀土尾矿可显著降低建筑垃圾陶粒的烧结温度,此效果在尾矿加入量1/10前较明显,当尾矿加入量超过1/5后,烧结温度不再有明显的降低;结合当前的环境需求和资源化回收利用政策,建筑垃圾和稀土尾矿是制备陶粒很有潜力的原料。(2)对陶粒烧制过程中原料配比的优化以稀土尾矿掺量以1/10为优,此时对烧结温度的优化为1140℃。因为稀土尾矿中富含铁氧化物,在烧结过程中可产生气体,一方面可以促进多孔结构的形成,另一方面当尾矿加入量过高时,容易导致空心、开裂等现象。(3)影响水热产物的主要因素有稀土尾矿掺入量、水热温度、NaOH浓度和水热时间。稀土尾矿的掺入量越高越不利于合成沸石结构。在反应温度180℃、NaOH溶液浓度为4mol/L,反应时间为10h下生成稳定相八面沸石。硅钙石和P型沸石是碱水热反应的中间产物。经过沸石化处理的陶粒比表面积从1.03 m2/g增加到 32.56 m2/g。(4)沸石化陶粒具有较大的比表面积,对重金属铅废水具有良好的去除效果。吸附等温线符合langmuir等温模型(R2为0.989),吸附时间为4 h基本达到吸附平衡,初始浓度高于200 mg/L吸附量稳定,最大吸附量可达95.2381 mg/g。(5)沸石化陶粒由于负载了稀土元素,对阴离子磷酸根也能起到一定去除效果,吸附等温线符合langmuir.等温模型(R2为0.989),吸附时间为6h基本达到吸附平衡,初始浓度高于60 mg/L吸附量稳定,最大吸附量达8.5470 mg/g。
[Abstract]:The rare earth reserves in Inner Mongolia Autonomous region are huge, and a large number of rare earth tailings are produced in the process of mining. High efficient adsorption materials with construction waste and rare earth tailings as main materials are developed. The main results are as follows: (1) addition of rare earth tailings can significantly reduce the sintering temperature of construction refuse ceramsite, and this effect is obvious before 1 / 10 of tailings addition. When the tailings content exceeds 1 / 5, the sintering temperature will not be significantly reduced; In combination with the current environmental demand and recycling policy, construction waste and rare earth tailings are potential raw materials for the preparation of ceramsite. (2) the ratio of raw materials in the sintering process of ceramsite is optimized by 1 / 10 of rare earth tailings. The optimum sintering temperature is 1140 鈩，
本文编号：2126144
[Abstract]:The rare earth reserves in Inner Mongolia Autonomous region are huge, and a large number of rare earth tailings are produced in the process of mining. High efficient adsorption materials with construction waste and rare earth tailings as main materials are developed. The main results are as follows: (1) addition of rare earth tailings can significantly reduce the sintering temperature of construction refuse ceramsite, and this effect is obvious before 1 / 10 of tailings addition. When the tailings content exceeds 1 / 5, the sintering temperature will not be significantly reduced; In combination with the current environmental demand and recycling policy, construction waste and rare earth tailings are potential raw materials for the preparation of ceramsite. (2) the ratio of raw materials in the sintering process of ceramsite is optimized by 1 / 10 of rare earth tailings. The optimum sintering temperature is 1140 鈩，
本文编号：2126144
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