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钢铁含油污泥是轧钢工艺过程中产生的一种危险性废物(HW08),其资源化利用难度大。采用碱洗法对含油污泥进行分离处理,并将分离所得的铁组元制备成复合纳米催化剂。碱洗脱油研究表明,当温度为80 ℃、碱溶液/含油污泥的质量比为1∶2、碱浓度为15%、反应时间为1 h时,含油污泥的脱油率达到94.14%,并得到铁质量分数为62.49%的固相。将脱油后的含铁固相通过共沉淀方法,得到粒径约为8 nm的磁性纳米Fe3O4,并与硅藻土通过溶剂热法制备了复合纳米催化剂,应用于罗丹明B催化降解,其降解率达到99.53%。本方法实现了对含油污泥的无害化处理和资源化利用。 相似文献
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在资源约束、环保压力趋紧的形势下,新时期球团环保的重点是减少NOx的排放,其高效控制关系着球团行业的生存。以铁矿球团为对象,研究了球团料层温度对不同铁精矿球团脱硝的影响,在此基础上研究了链箅机抽风干燥段(DDD段)催化脱硝的反应行为,并通过脱硝率、氨利用率等来表征烟气成分对DDD段喷氨脱硝的影响。研究结果表明,在相同条件下,赤铁精矿的催化性能优于磁铁精矿和混合铁精矿,同时分析了链箅机各段温度分布的特点,最终选择DDD段作为SCR脱硝的反应区域。DDD段适宜的脱硝条件为,温度为300~350 ℃,氧气体积分数为15%~20%,氨氮比(物质的量比)为0.5;在链箅机抽风干燥段进行SCR脱硝时,烟气中的SO2体积分数由0提高到0.050%,反应脱硝率由51.0%降低到34.4%;随着烟气中水蒸气含量的提高,反应脱硝率降低,在水蒸气体积分数为9%时,脱硝率仅为44.9%,总体来讲,控制SO2体积分数小于0.040%,水蒸气体积分数小于6%,可以获得40%左右的脱硝率,在DDD段喷氨催化法脱硝是高效可行的。 相似文献
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In order to optimize the sintering process, a real-time operation guide system with artificial intelligence was developed, mainly including the data acquisition online subsystem, the sinter chemical composition controller, the sintering process state controller, and the abnormal conditions diagnosis subsystem. Knowledge base of the sintering process controlling was constructed, and inference engine of the system was established. Sinter chemical compositions were controlled by the strategies of self-adaptive prediction, internal optimization and center on basicity. And the state of sintering was stabilized centering on permeability. In order to meet the needs of process change and make the system clear, the system has learning ability and explanation function. The software of the system was developed in Visual C+ + programming language. The application of the system shows that the hitting accuracy of sinter compositions and burning through point prediction are more than 85 % ; the first-grade rate of sinter chemical composition, stability rate of burning through point and stability rate of sintering process are increased by 3 %, 9 % and 4%, respectively. 相似文献
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针对钢铁厂难处理粉尘有害元素含量高而制约其资源化利用的问题,以转炉泥为研究对象,通过卧式管炉模拟高温处理工艺生产条件,研究了转炉泥单独焙烧时有害元素的脱除特征,焙烧过程可脱除部分K、Na、Zn、Pb,但因氯低导致氯化挥发的脱除率低、焙烧温度高。针对此问题,将高氯垃圾飞灰配入转炉泥进行协同处置,以强化有害元素的脱除。研究表明,当飞灰配入量为28%时,焙烧温度可以降至1 100 ℃,且K、Na、Pb、Zn、Cl的脱除比例分别从61.32%、46.65%、36.09%、10.99%、77.06%提高到97.93%、68.96%、87.91%、59.76%、93.79%,焙烧过程主要为固相反应,无明显液相生成。在转炉泥和飞灰的混合料中适当配入碳粉,提供一定的还原性气氛,还可进一步提高有害元素的脱除比例,当配碳量为6%时,Pb、Zn脱除率提高到94.10%、67.94%,继续提高至10%时,Pb、Zn脱除率达到95.84%、94.74%。通过协同处理,不仅能够实现钢铁粉尘中有害元素的高效分离和富集,而且还能获得具有利用价值的固态铁渣,并可为飞灰无害化提供新的途径。 相似文献