【作者】 韩毅；

【导师】 王京刚；

【作者基本信息】 北京化工大学 ， 环境工程， 2004， 硕士

【摘要】 赤泥是氧化铝生产中产生的废弃物，针对我国现阶段氧化铝生产、赤泥利用的现状，提出了进一步开发赤泥高附加值产品的必要，利用烧结法赤泥进行了两方面的研究工作。以氯化铁作为改性剂制得改性赤泥，用于吸附含铬废水中的六价铬离子，其去除率最高达到了 96.18%，效果较为理想。并借助扫描电镜（SEM）、X-射线衍射（XRD）、热失重与差热分析（TG-DTA）和红外光谱分析（FTIR）等手段，对赤泥及改性赤泥结构进行了系统的表征。结果表明由于三价铁离子（Fe3+）的引入，增强了改性赤泥的吸附能力。针对相应的改性剂用量、吸附剂用量、pH、吸附温度、吸附时间等条件进行了比较优化。并且利用Langmuir等温式和Freundlich等温式对于其吸附进行了机理上的探讨，表明氯化铁改性赤泥和赤泥原泥对重铬酸根阴离子的吸附是通过物理吸附和化学吸附的协同作用来进行的。 利用烧结法赤泥为主要原料，辅以粉煤灰、膨润土等其他物料，制备以赤泥为主体的新型陶粒产品。根据陶粒配料要求进行合理配比，以颗粒抗压强度和吸水率为主进行赤泥陶粒的表征。结果表明，当赤泥含量为50～60％ 、粉煤灰含量为20～30％时，在1100～1125℃的烧 I<WP=4>北京化工大学硕士学位论文结温度范围内，烧成时间小于120min时，所制得的陶粒单体强度可达8Mpa以上，吸水率可达40％左右。 这两种方法为赤泥的再利用又提供了新的途径，也为赤泥利用效率的提高提供了新的选择。更多还原

【Abstract】 Red Mud is a waste material formed during the production of alumina.Considering the situation of alumina production and red mud utilization, itis necessary for us to develop production which has the high additionalvaluation. And in this article, red mud were treated by two methods. Using red mud as the main material, red mud was activated by theFeCl3 as an absorbent of Cr6+. The results show that activated red mud hashigher adsorptive ability of Cr6+ by 96.18%. The structure of red mud andraw material are studied by SEM, XRD, TG-DTA and FTIR. Because of theincreased Fe3+, the adsorption capability of activated red mud has greatlyimproved. The dosage of modifier, the dosage of sorbent, pH, temperatureand equation time has been optimized. And the mechanism of adsorptionalso has been discussed using Langmuir and Freundlich isotherm equation.Adsorption mode of activated red mud and raw material are cooperated byphysical adsorption and chemical adsorption. Mixing with fly ash and bentonite, red mud as the main material was III<WP=6>北京化工大学硕士学位论文sintered to a new-style ceramsite production. When 50~60% red mud ismixed with 20~30% fly ash, sintering temperature range is 1100～1125℃,firing time is less than 2 hours, red mud ceramsite particle’s compressivestrength is higher than 8 MPa and rate of water absorption is higher than40%. Each of the two methods gave us a new choice to improve availabilitycoefficient of red mud.更多还原