共查询到20条相似文献,搜索用时 156 毫秒
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1 前言硫酸渣(硫铁矿烧渣)是硫酸生产过程中排出的废物,每生产1t硫酸约排出渣0.8-1.1t。龙海磷肥厂现有硫酸生产系统两套,年产硫酸6.5万t,每年排放废渣6万t。对这些废渣的利用一般以低价(8元/t)销售给水泥厂,如果遇到水泥厂不景气,就大量堆积于厂内矿渣场,或弃之空地,这样,不仅占据大量的土地,污染周围 相似文献
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《矿山资源开发利用与环境保护》2002,(3):4-4
聚凝硫酸铁(PPFS)是以硫铁矿烧渣为原料,通过熟化、水浸、过滤等工艺得到聚合硫酸铁溶液,再向溶液中加入一定量的Na3PO4溶液,在80℃下搅拌2h即得到PPFS。 相似文献
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用硫酸烧渣制取硫酸亚铁 总被引:1,自引:0,他引:1
用硫酸烧渣制取硫酸亚铁在硫酸的生产过程中,排出硫酸烧渣,其中含有58%的铁和一些有色金属。目前,我国对此废渣尚未很好地利用。我们采用一种廉价的还原剂,将其先与此烧渣进行还原反应,使烧渣中的三价铁全部转化为低价铁,而后再用硫酸厂的废硫酸浸取还原渣,浸出... 相似文献
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探讨了利用硫铁矿烧渣制备电池级磷酸铁的工艺。实验结果表明:常压下,添加1.3倍31%的盐酸,100℃下搅拌反应60 min,Fe的浸出率可达96%以上,残渣率为20.4%。浸出液经还原后,在添加氟化钠除铝时,需考虑溶液中钙、镁的影响;添加1倍量的NaF,还原液中的Al可降低到1 mg/kg。利用除杂后的FeCl2溶液氧化制备得到的磷酸铁,符合行标要求。该工艺实现了硫铁矿烧渣的资源化利用,具备一定的经济与社会价值。 相似文献
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Ibrahim Alp 《Waste management & research》2008,26(5):431-438
In this study, colemanite was recovered from tailings produced by the Kestelek (Turkey) Processing Plant by magnetic separation. Magnetic susceptibility measurements revealed that colemanite is diamagnetic in character whereas gangue minerals are weakly paramagnetic, apparently due to the presence of the iron-bearing silicates such as smectite and, to a less extent, illite. Three-stage magnetic separation tests were performed on the size fractions coarser than 75 microm produced from the tailings (31.52% B(2)O(3)) using a high-intensity permanent magnetic separator. Under the test conditions a colemanite concentrate with a B(2)O(3) content of 43.74% at 95.06% recovery was shown to be produced from the tailings. The mineralogical composition of the tailings appears to allow the removal of gangue minerals by magnetic separation and hence the production of a concentrate of commercial grade. 相似文献
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以介孔分子筛SBA-15为模板,采用三氯化铁和蔗糖同步浇铸的方法,利用纳米刻蚀技术合成了Fe-Fe3O4磁性纳米粒子/介孔碳复合体(简称磁性粒子/介孔碳)。XRD分析和高分辨透射电子显微镜表征结果表明,磁性粒子/介孔碳中含有强磁性粒子——Fe3O4和α-Fe。在初始罗丹明B质量浓度为200 mg/L的溶液中加入于碳化温度为800 oC下制得的磁性粒子/介孔碳1 mg/L,吸附190 min后,平衡吸附量为329 mg/g。吸附后的磁性粒子/介孔碳在乙醇中的脱附率可达93.7%。通过外加磁场可将吸附后的磁性粒子/介孔碳与溶液分离。 相似文献
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Integrated iron and steel plants generate large amounts of metallurgical slag, which usually contains some quantity of metals or mixtures of oxides that could be treated to be recycled in various applications. The conventional method for disposal of slags is dumping. However, it is possible to process the slags to be used in the production of metallic iron, or as an additive in cement making. In this study, a basic oxygen furnace (BOF) steelwork slag obtained from the Kardemir integrated iron and steel works, Karabuk, Turkey is used. A drum magnetic separator system with pre-engineered crucial processing parameters of drum revolution speed, drum radius, drum flesh thickness, and magnitude of the magnetic field applied is utilized, as these parameters have a competing influence on the results. Subsequently, the effects of slag grain size and the drum-blade gap are investigated in the separation efficiency of magnetic grains. It is found that collection of magnetic grains is improved by decreasing the grain size of slags and moreover, the collection of magnetic grains fraction is increased with an increase in the gap between the blades and drum. 相似文献
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磁载光催化剂ZnO/SiO_2-Fe_3O_4的光催化活性 总被引:1,自引:1,他引:0
采用液相沉积法制备出了纳米SiO_2-Fe_3O_4复合粒子,并在其表面负载ZnO,得到了易于磁性固液分离的磁载光催化剂ZnO/SiO_2-Fe_3O_4,并通过傅立叶红外光谱仪、X射线衍射仪和透射电子显微镜等对光催化剂进行了表征.以亚甲基蓝为目标降解物,研究了光催化剂在紫外光下的光催化活性.实验结果表明,在Fe_3O_4和ZnO之间包覆一层无定形SiO_2可使亚甲基蓝降解率由20.34%提高到94.52%,所制备的ZnO/SiO_2-Fe_3O_4在3次重复使用后仍能保持较好的光催化性能. 相似文献
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以Al-Fe柱撑膨润土为原料,通过原位氧化沉淀法负载纳米Fe3O4颗粒,制备磁性膨润土。采用XRD,SEM,EDS技术对磁性膨润土进行了表征,并将其作为类Fenton反应催化剂对焦化厂二沉池出水(COD为267.6 mg/L、色度为428度)进行了深度处理,探讨了各反应条件对处理效果的影响。实验结果表明:Fe3O4颗粒较为均匀地分布在膨润土表面,负载牢固;在H2O2加入量70 mmol/L、磁性膨润土加入量0.8 g/L、反应温度30 ℃、初始废水pH 5.0的条件下反应30 h,废水COD和色度的去除率分别达到78.5%和93.4%,COD和色度分别降至57.5 mg/L和28度,满足GB/T 19923—2005《城市污水再生利用 工业用水水质》的要求;磁性膨润土使用4次后,对废水的处理效果仍很稳定。 相似文献
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以正硅酸乙酯(TEOS)作为包覆材料,对锰锌铁氧体纳米颗粒进行SiO2包覆,制备出锰锌铁氧体/SiO_2复合磁性材料。利用FTIR,XRD,SEM等技术对其进行了表征,并研究了其对模拟亚甲基蓝废水的吸附脱色效果。实验结果表明:当SiO_2质量分数为40%1时,采用先将锰锌铁氧体在柠檬酸溶液中搅拌分散3 h后,加人氨水调节溶液pH,再继续搅拌分散3 h的分段分散方法制备的复合磁性材料对亚甲基蓝废水的处理效果更好,处理亚甲基蓝质量浓度为50 mg/L、COD为160 mg/L的废水,废水脱色率为97.2%,COD去除率为19.3%。表征结果显示:复合磁性材料锰锌铁氧体/SiO_2为球形颗粒,平均粒径为100 nm;SiO_2包覆前后锰锌铁氧体的晶型均为尖晶石型结构,在复合磁性材料中SiO_2以无定型的形态存在。 相似文献
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含磁粉生物反应器处理苯酚废水 总被引:4,自引:2,他引:2
采用含磁粉生物反应器对质量浓度为120~350 mg/L的苯酚模拟废水进行强化生物处理.实验结果表明:添加适量磁粉可使废水中DO提高约10%;与不含磁粉生物反应器比较,含磁粉生物反应器工艺使填料挂膜时间缩短1~2 d,填料上附着微生物量增多;质量浓度为350 mg/L的苯酚模拟废水在20 h内的苯酚去除率可达80%,降解时间缩短了10 h.初步分析了添加磁粉提高生物反应器处理废水效率的机理.实验证实了含磁粉生物反应器工艺的合理运用是强化处理含酚废水的有效途径. 相似文献
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An overview of recovery of metals from slags 总被引:17,自引:0,他引:17
Various slags are produced as by-products in metallurgical processes or as residues in incineration processes. According to the origins and the characteristics, the main slags can be classified into three categories, namely ferrous slag, non-ferrous slag and incineration slag. This paper analysed and summarised the generation, characteristics and application of various slags, and discussed the potential effects of the slags on the environment. On this basis, a review of a number of methods for recovery of metals from the slags was made. It can be seen that a large amount of slags is produced each year. They usually contain a quantity of valuable metals except for blast furnace slag and they are actually a secondary resource of metals. By applying mineral processing technologies, such as crushing, grinding, magnetic separation, eddy current separation, flotation and so on, leaching or roasting, it is possible to recover metals such as Fe, Cr, Cu, Al, Pb, Zn, Co, Ni, Nb, Ta, Au, and Ag etc. from the slags. Recovery of metals from the slags and utilisation of the slags are important not only for saving metal resources, but also for protecting the environment. 相似文献