从炼钢烟尘中回收氧化锌的研究

根据炼钢烟尘和锌浸出渣成分的相似性,从理论上分析了应用炼钢烟尘时,挥发窑反应原理及炉料温度,焦粉配比,窑头风量和窑内的负压等工艺技术条件控制,介绍了从炼钢烟尘中回收氧化锌生产试验的结果,并提出了最佳工艺条件。     

从高炉瓦斯灰和炼钢炉的烟尘中回收锌

本文介绍了炼铁和炼钢过程所产生的烟尘中锌的回收工艺研究,其浸取率约为58％,烟尘经过高压浸取、蒸馏、置换、焙烧和水洗可获得高纯度氧化锌。     

HTR—节能型还原挥发除锌法

<正> 世界上电炉炼钢所占比例不断增加,电炉冶炼每吨钢回收的烟尘量为13～17kg,一般筑路用或废弃。从环境保护和资源回收来看,烟尘含锌、铅等有价金属,应回收。处理电炉烟尘有还原挥发法,西德的伯泽列厄斯金属工厂的威尔兹烟化法就是其典型例子。基本流程是将含锌、铅、镉的电炉烟尘     

从电炉炼钢烟尘中回收钼

<正> 电炉炼钢烟尘主要组分为氧化铁及氧化锌,已有回收的研究结果报导,新近日本室兰工业大学又对电炉炼钢烟尘中所含的少量元素钼的回收进行了研究试验工作,并根据试验结果提出了系统的处理方案。电炉炼钢烟尘中所含的钼以三氧化钼形式存在,难溶于水而易溶于碱性溶液之中,故回收过程一般采用碱性溶液浸出法。但由     

有色冶金动态

四贩岛冶炼厂从炼钢烟尘中生产氧化锌炼钢烟尘中含有相当多的锌和铅。最近,从这些废料中回收锌和铅的工作,无论从环境保护和资源回收来说,都已引起广泛的重视。日本住友公司四阪岛冶炼厂处理炼钢烟尘的一个车间,于1977年8月投产以来一直在进行生     

转炉除尘灰的循环利用技术和应用

转炉炼钢过程中会产生大量有害烟尘,经现代化的环保除尘设备处理回收后,可以得到粒度细小且含铁料高的除尘灰。通过采取一定的技术措施,成功开发出符合转炉使用的除尘灰压块。经炼钢转炉现场使用证明除尘灰压块具有良好的冷却和化渣效果,可以替代铁皮球、渣钢和铁矿石,实现了转炉除尘灰的"全闭路"综合利用。     

利用CO2减少炼钢烟尘的实验研究

炼钢过程每冶炼1 t钢产生约10～20 kg烟尘,烟尘量的增加既降低金属收得率又增加了除尘负荷.炼钢烟尘的治理,传统方式是在烟尘产生后再进行回收处理利用;然而如何在冶炼过程中减少烟尘产生的工艺方法还未见文献报道.通过热力学计算和理论分析,进行了利用CO2减少炼钢烟尘产生的探索性实验,实验结果表明,随着混合喷吹中二氧化碳比例的提高,烟尘的产生量逐步减少,铁损呈明显的下降趋势.     

负能炼钢在宝钢的应用与发展

介绍了自1989年以来“负能炼钢”在宝钢的应用与发展情况,系统分析了实现负能炼钢的途径与方法:即从降低能源介质消耗和提高余能回收入手,阐述了降低电力消耗和转炉煤气(LDG)回收在负能炼钢中的重要性。并指出了今后工作的重点是在稳定现有技术的基础上应用密闭裙罩技术提高LDG回收;应用干法除尘技术以提高蒸汽回收;以及应用其他余能回收技术来稳定和推动负能炼钢的进一步发展。同时,指出了负能炼钢对环境保护的现实意义。     

方大特钢转炉-精炼-连铸全工序负能炼钢实践剖析

对方大特钢中小型转炉从铁水脱硫预处理—转炉—LF精炼炉—连铸全工序实现＂负能炼钢＂的实践进行了剖析,开发转炉煤气和蒸汽用户是前提,提高转炉煤气回收是降低炼钢工序单位能耗的关键,而提高转炉蒸汽回收又是进一步降低炼钢工序单位能耗的重点,同时节电、提高工序作业率等也是降低炼钢工序单位能耗的措施。     

铅、铜冶炼烟尘中有价金属的综合回收

对铜、铅冶炼氧气底吹熔炼炉烟尘中有价金属的回收进行研究,介绍了两类烟尘有价金属回收的工艺流程,主要包括烟尘浸出后,从浸出液中回收镉、锌、铜等金属,从浸出渣中回收铅、铋等金属。     

高炉污泥处理用的水力旋流设备

高炉炉顶煤气中产生大量的粉尘。此粉尘被排放到废料场,但是,更具有吸引力的是通过烧结厂将此粉尘进行回收,再返回到高炉中。这些粉尘的某一部分,特别是细颗粒,含有0．4％～2％的锌和不同浓度的其他重金属。锌源于铁矿,但是,也有部分来自于钢厂的其他各种回收含铁废物,其中一些是来自于镀锌废钢。回收大部分重金属成分,特别是锌,对高炉工艺流程来说是不希望有的,因为在工厂锌平衡中引起锌增加。Corus Ijmuiden开发了一种水力旋流设备,用于将高炉粉尘分离出粗、细颗粒,并能在高炉中带入最大锌的量、回收含铁材料和排出富锌粉尘之间实现最经济的平衡。     

从高氟氯烟尘中富集铟的研究

国内冶炼常规湿法流程锌浸出渣生产氧化锌脱氟氯时会产生大量的烟尘,其中含有锌、铅、铟、镉、氟、氯、砷等元素。研究了该烟尘富集铟、回收锌和铅以及处理氟、氯、砷等有害元素的工艺流程。结果表明,采取适当的工艺后可以回收烟尘中的有价金属。     

An electrolytic process for recovery of zinc dust from melting furnace slag

The fine fraction (below 74 μm) of the slag from a zinc cathode melting furnace contains about 80% zinc. Zinc from this slag may be recovered as zinc dust by electrolysing sodium zincate solution. Zinc recovery as zinc dust is about 75–80% and the zinc dust so obtained may be used successfully for cementation of impurities in the hydrometallurgical process of manufacturing zinc. The process has been studied both on the small and pilot scales and process engineering studies indicate that it is economical.     

Extraction of zinc and iron from electrosmelting dust

The extraction of zinc and iron from dusty electrosmelting wastes is discussed. The chemical composition of the dust is investigated. Methods of obtaining zinc- and iron-bearing products by reduction are identified. The optimal conditions for the generation and capture of zinc sublimates are determined. A system for processing steel-smelting dust to obtain iron is proposed. Simultaneously, this technology extracts zinc from the dust in the form of zinc-oxide concentrate.     

钢厂尘泥的整体优化处理

由于含有对高炉冶炼有害的锌，钢厂各种尘泥在钢厂内无法得到全部的综合回用，这不仅会造成环境污染,也是尘泥资源的巨大浪费。本文提出了对含铁尘泥整体优化处理的方案，即按其中锌含量的不同而将尘泥分类，从而采取不同的高效、合理的回收处理方案。     

Correlation of BOS process variables with dust mass formation and zinc content

Abstract

The basic oxygen steelmaking (BOS) process typically produces a dust rich in valuable iron units and often contaminated with zinc. This paper takes a look at statistical correlation and multiple regressions of process variables with the quantity of dust and the zinc mass contained in the dust. A robust inline sampling system was designed and installed to isokinetically sample the primary BOS dust slurry from a 248 m³ capacity BOS converter at Tata Steelworks Port Talbot (UK). This system was used to measure the dust mass and composition changes against time for 12 large scale trial heats and to compare with the process information data for a statistical evaluation of the variables. Statistically significant Pearson linear correlations were measured for the total dust mass produced with the iron ore and for the zinc mass contained in the dust with the addition of waste oxide briquettes (WOBs). A multiple regression analysis model showed strong associated correlations between the zinc mass contained in the dust with the galvanised scrap and WOB additions and explained 73% of the zinc mass variance.     

锌氧化物杂料中氯的脱除工艺研究

以阴极锌铸型渣为原料,对水洗除氯工艺进行了系统的条件试验研究,并得出结论:在固液比1∶10、温度70℃、时间1.5 h、中等搅拌强度的条件下,氯的脱除率为84.64%。在此试验条件下,以阴极锌熔铸电炉烟尘、蒸馏炼锌焦结烟尘、挥发窑氧化锌多膛炉除氯烟尘为原料,进行了半工业试验,一次水洗脱氯率可达85%～92%,高于火法烟化工艺,也高于文献报道的湿法脱氯水平。     

高炉锌平衡及含锌尘泥的回收利用

分别对宝钢2BF、3BF的原燃料、重力灰、集成灰、生铁、炉渣、污泥、污水、煤气进行取样,测定各试样中的锌含量,结合高炉生产数据对2BF、3BF进行锌平衡计算。计算结果表明：烧结矿锌含量是影响高炉锌负荷的主要因素;高炉污泥和重力灰带走的锌占2BF全部锌支出的88．11％;而3BF中的锌主要由渣、铁(包括集成灰)带走;高炉尘泥需进行脱锌处理才能配入烧结料中。     

Dust formation in a BOF converter

Minimisation of waste and manipulation of residues to suit succeeding processes today is one of the steel works most important research areas. BOF dust is expensive to depose in landfills and difficult to recycle due to its zinc contents. The simultaneous loss of raw materials and cost increase makes it important to minimise the generation of dust. This can be done by employing better process control systems with regard to the mechanisms governing the generation. Four dust forming mechanisms can be considered in a converter: ejection of metal, ejection of slag, entrainment of charged material and vaporisation. In order to determine the importance of the four dust forming mechanisms and to characterise dust, with special emphasis to zinc, the off-gas from a 100-t BOF was sampled during twenty seven heats. The sampling equipment allows the sampling of both solid dust particles and vaporised elements. Samples from the first and the second part of blowing show significant differences both in chemical composition and in the origin of formation. The major dust formation mechanism is the ejection of metal and slag, respectively. Entrainment of solids plays an important role only during the first part of blowing. Vaporisation of elements from the bath is most important during the end of blowing. The formation of dust is influenced by process operation control, especially lance position, silica contents and time of charging of slag formers. Zinc is mostly found on the rim of ejected particles where a gradual transition of zinc oxide to zinc ferrite to iron oxide is found. At sampling temperatures of between 800 and 1000°C most of the zinc had already condensed.     

回转窑还原焙烧锌冶炼污泥与烟尘回收研究

设计了处理能力为100t/d的回转窑,开展低品位锌冶炼废水处理污泥还原焙烧回收氧化锌烟尘的试验。结果表明,污泥含锌品位对回转窑挥发获得氧化锌烟尘的效果有显著影响;当污泥的锌品位为5.04%和8.34%时,表冷收尘系统回收烟尘含锌分别为19.4%和21.4%,对应的布袋收尘系统回收烟尘的含锌量高达50.2%和51.6%。水淬渣浸出液中重金属浓度均低于GB5085.3-2007危险废物的各项限值,可直接用于生产或堆存。