湿法炼锌浸出渣的资源化实践与创新

在循环经济的时代背景下,如何处理高温离酸浸出湿法炼锌工艺所产生的铅银渣和铁矾渣的问题日益提到议事日程,若采用单一的浸渣固化标准来衡量高温高酸浸出湿法炼锌工艺,势必从根本上否定该工艺.本文分析了高温高酸浸出工艺面临的困境,指出了浸出渣难以资源化的症结所在,介绍了几种浸渣资源化的技术与实践,探讨了今后高温高酸浸出工艺改革的发展方向.     

Hexagonal hematite platelets synthesized from pyrite cinders by hydrothermal process

Well-crystallized hexagonal hematite (α-Fe2O3) platelets were synthesized by hydrothermal process,using a highly concentrated ferric hydroxide as precursor.The precursor was prepared by adding ammonia to the ferric sulfate solution which was obtained by leaching pyrite cinders with sulfuric acid.Structure and morphology of the synthesized products were investigated by X-ray diffraction,scanning electron microscope,transmission electron microscope and selected area electron diffraction.The results reveal tha...     

氧化铁的制备方法及其应用

随着高科技的迅速发展和对合成新材料的迫切需要,氧化铁的制备技术及其应用的开发已越来越受到重视.为此全面叙述了氧化铁的制备方法,分析了焙烧法、热分解法、鲁式法、溶胶-凝胶法、空气氧化法、水解法、沉淀法、水热法、催化法及包核法等各种制备工艺的优缺点.同时,详细地介绍了氧化铁在磁性材料、颜料、催化、生物医学及其他领域的应用.最后,针对目前氧化铁制备技术中存在的一些问题,提出了进一步研究的方向.     

硫铁矿烧渣水热法制备氧化铁红颜料工艺研究

在以硫铁矿烧渣为原料、氨水为沉淀剂水热法制备氧化铁红颜料试验中,研究了总铁含量、反应温度、反应时间、pH值及n（Fe~（2＋））/n（Fe~（3＋））等因素对氧化铁红Fe_2O_3含量和颜色色相的影响。研究表明,在总铁含量2.0 mol/L、反应温度200℃、反应时间0.5 h、pH=7～8和n（Fe~（2＋））/n（Fe~（3＋））=0.11的条件下,可以获得高性能鲜红色氧化铁红颜料,并对氧化铁红产品进行XRD和SEM表征,产品质量符合国家标准要求。     

Micaceous iron oxide prepared from pyrite cinders by hydrothermal method

Micaceous iron oxide (MIO) with a hexagonal flaky shape was prepared by hydrothermal method. The ferric hydroxide used as precursor was obtained by an acidic leaching solution of pyrite cinders reacting with ammonia solution. The optimal experimental conditions for preparing micaceous iron oxide were investigated by orthogonal experiments. Micaceous iron oxide can be successfully prepared when optimal parameters of total iron concentration of 2.0 mol/L, pH value of 8, n(Fe²⁺)/n(Fe³⁺) of 0.1, mass of seed crystal of 1 g, reaction temperature of 260 °C and reaction time of 30 min are applied. X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffractometry (SAEM) were adopted to characterize the hydrothermal products prepared under optimal conditions. The results indicate that highly crystallized α-Fe₂O₃ hexagonal flakes, about 1.0–1.5 μm in diameter and 0.1 μm in thickness, are prepared. Furthermore, the quality of micaceous iron oxide prepared can meet the required characteristics of micaceous iron oxide pigments for paints (ISO10601—2007).     

用水热法从硫铁矿烧渣制备氧化铁红

在硫铁矿烧渣与硫酸反应后的酸浸液中加入氨水,所得含Fe(OH)₃和Fe(OH)₂胶体的前驱物经水热反应可制备出氧化铁红。以广东某硫铁矿烧渣为原料,着重研究了采用该酸浸-水热法制备氧化铁红时酸浸后的适宜工艺条件,结果表明,在酸浸液总铁浓度为2.0 mol/L、水热反应温度为200 ℃、水热反应时间为0.5 h、酸浸液pH=8、酸浸液n(Fe²⁺)/n(Fe³⁺)=0.11时,可获得各项质量指标均达到国家标准一级品要求的氧化铁红产品,其主要物相为Fe₂O₃和FeO(OH),颗粒为大小均匀的假立方形,同时还可从水热反应产物的滤液中获得工业优等品硫酸铵。