钢铁厂含锌尘泥的除锌工艺

介绍适合我国钢铁厂应用的含锌尘泥除锌工艺及其状况,即水力旋流器脱锌系统,循环流床床,利用铁水显热回收率、二次燃烧熔炼技术,环形转底炉（ＲＨＦ）法等。     

微波场下冶金含锌尘泥的脱锌效果

研究了在微波场下用C和SiC作还原剂时,氧化锌在精矿粉中的还原率,以模拟钢铁企业冶金含锌尘泥中锌的去除.结果表明:微波处理冶金含锌尘泥,脱锌反应快,效果显著,并且SiC作还原剂时效果较好,得到的氧化锌纯度可达97.7%.     

转炉和含锌铅高炉尘泥的物性和物相分析

对转炉和含锌、铅高炉尘泥的部分物性、化学成分、物相种类及分布,尤其是含锌、铅物相分布的研究表明：两种尘泥的粒度均较小;转炉尘泥堆密度较大,铁含量较高;高炉尘泥的锌、铅、碳含量较高,其中的大多数锌、铅氧化物均匀附着在硅酸盐和焦碳末粒子上。这些特点有利于对两种尘泥采用造球－直接还原方法处理。     

Kinetics of isothermal reduction of stainless steelmaking dust pellets

The stainless steelmaking dust pellets were reduced in isothermal temperature condition simulating the direct recycling practice in the stainless steel production and the kinetics of the reduction process was investigated.The pellets were formed after mixing the dust with carbon as the reducing agent and dolomite as the binder and smelting flux. An electric furnace was used to heat the pellets and an electrical microbalance was used to check the mass of the pellets in the reduction process. The reduction rate was calculated according to the data of pellet mass change in consideration of the evaporation of moisture, zinc and lead at high temperature. The results of the experi-ments show that the reduction process is in two consecutive stages. The reduction kinetic models were set up for each stage and the kinetic parameters such as activation energy and frequency factor were determined. The apparent activation energy of the first stage is 21.69 kJ/mol, and this stage is controlled by chemical reaction. The apparentactivation energy of the second stage is 17.35 kJ/mol, and this stage is controlled by the diffusion of carbon monox-ide through the resultants of reaction.     

马钢首座20万吨含锌尘泥转底炉脱锌工程点火烘炉

4月中旬，马鞍山钢铁集团公司三铁总厂20万吨／年含锌尘泥转底炉脱锌工程成功实施点火烘炉。这是一项节能减排、绿色环保型工程，发展前景十分广阔，对马钢来说属于首次。该项工程正常达产后，年产金属化球团达11．34万吨，回收锌为0．3488万吨，为马钢最终实现循环经济和绿色环保型经济相结合的发展模式开了一个好头。     

高炉泥炮液压系统的改进

通过分析现有泥炮液压系统的工作原理及其不足,提出了高炉泥炮液压系统的改进措施.经过改进的泥炮液压系统消除了安全隐患,为高炉的连续生产提供了可靠的保障.     

高炉泥炮双向液压锁系统的改进

介绍了石家庄钢铁有限责任公司炼铁厂高炉泥炮使用中出现的振动问题，通过分析高炉泥炮双向液压锁工作原理以及系统的改进，消除了高炉泥炮的振动。     

湿法炼锌净化渣酸浸的动力学

对湿法炼锌净化渣的浸出动力学进行了研究,并探讨了硫酸浓度、反应温度、粒度等对钴、锌浸出率的影响规律。从动力学的角度分析了整个浸出过程,得到优化条件：液固比50：1(mL/g),硫酸浓度100 g/L,反应温度70°C,粒度75~80μm,反应时间20 min。在此优化条件下钴的浸出率为99.8%,锌的浸出率为91.97%。结果表明：在硫酸体系中钴的浸出符合不生成固体产物层的“未反应收缩核”模型。通过 Arrhenius 经验公式求得钴和锌表观反应活化能分别为11.693 kJ/mol和6.6894 kJ/mol,这表明浸出过程受边界层扩散控制。     

300m~3高炉液压泥炮的故障分析及其改造

本文详细地分析了液压泥炮产生故障的原因和采取的有效防止措施。     

含Ti高炉渣的加压酸解

含Ti高炉渣中的TiO2 含量很高 ,质量分数约为 2 4%左右 ,是宝贵的二次资源。用稀硫酸加压酸解含Ti高炉渣提取其中的Ti,并分析物料粒度、酸浓度、渣酸比、反应温度、反应时间等因素对TiO2 酸解率的影响 ,得出了加压酸解的适宜条件。TiO2 酸解率达到 90 %以上。酸解液水解获得的TiO2 产物纯度为 90 %以上。为开发利用废稀酸提取含Ti高炉渣中的Ti提供了依据。     

高炉出铁场除尘技术研究与应用

本文论述了出铁场烟气治理的必要性,介绍了武钢对出铁场烟尘的"全面控制”方法,总结了效果并指出了需进一步完善的措施.     

烧结电除尘灰中钾盐的回收及其浸出动力学

为了研究烧结电除尘灰中回收钾盐的强化浸出措施,使用ICP-AES、SEM-EDS和XRD分析技术对除尘灰的表面和内部形态,特别是钾盐的赋存形式进行分析。结果表明,该电除尘灰的主要成分是铁氧化合物,在其表面裸露吸附着一定含量的KCl晶体。水浸实验表明,该粉尘中的KCl可以通过水浸出、蒸发结晶的方式回收,其收率为18.56%。结晶产物的分析结果表明,KCl占61.21%,NaCl占13.40%,CaSO4占14.62%,K2SO4占10.86%。其水浸出动力学符合外扩散控制模型控制。强化浸出实验表明,提高浸出温度、加强搅拌、增加液固比等措施可以提高钾盐的浸出率和浸出速率。     

钢铁厂烧结机头灰中铅的配位浸出行为与综合回收

针对钢铁厂烧结机头灰中富含铅、铁、碳、钾、氯等多种有价元素的特点,根据氯离子与铅配位的特性,采用配位浸出的方式实现铅与铁、碳等元素的选择性分离回收。SEM-EDS、XRD等研究分析表明,烧结机头灰中铅主要以絮状的KPb₂Cl₅等物相吸附于铁氧化合物、硅铝酸盐和碳颗粒表面,铁主要以Fe₂O₃和Fe₃O₄物相存在。实验考察了溶液pH值、温度、氯离子浓度、浸出时间和液固比等因素对铅浸出率的影响。研究表明,在溶液pH值为3.0,浸出温度为80℃,氯离子浓度为6 mol/L,液固比(mL/g)为10:1,浸出时间为2 h的优化条件下,烧结机头灰中铅化合物与氯发生配位溶解反应生成PbCl_i^2-i(i=1～4)等易溶解的络合离子,实现铅的浸出,铅浸出率为95.7%;而烧结机头灰中对钢铁冶炼有用的铁、碳、硅、铝等元素不被浸出,富集在浸出渣中,较好地实现了选择性浸出。浸出液中的铅经冷却结晶、洗涤纯化后,获得纯度为99%的氯化铅产品...     

Selective recovery of zinc from zinc oxide dust using choline chloride based deep eutectic solvents

Deep eutectic solvents (DESs) are a kind of potential lixiviant for selective metal processing due to their versatile complexation properties. In this study, we investigated the recovery of zinc from zinc oxide dust using choline chloride−urea− ethylene glycol (ChCl−urea−EG) DESs. The zinc extraction efficiency can be up to 85.2% when the slurry concentration is 50 g/L, leaching temperature is 80 °C and stirring speed is 600 r/min. The leaching process is controlled by the diffusion and the corresponding activation energy is 32.1 kJ/mol. The resultant solution was directly used for the electrodeposition of zinc. The pure zinc deposit is obtained with a current efficiency of 82.6%. Furthermore, the ChCl−urea−EG DESs can be recycled. This approach is shown to be promising for the recycling of zinc from the zinc-containing dust.     

Recovery of valuable metals from zinc leaching residue by sulfate roasting and water leaching

Zinc leaching residue (ZLR), produced from traditional zinc hydrometallurgy process, is not only a hazardous waste but also a potential valuable solid. The combination of sulfate roasting and water leaching was employed to recover the valuable metals from ZLR. The ZLR was initially roasted with ferric sulfate at 640 °C for 1 h with ferric sulfate/zinc ferrite mole ratio of 1.2. In this process, the valuable metals were efficiently transformed into water soluble sulfate, while iron remains as ferric oxide. Thereafter, water leaching was conducted to extract the valuable metals sulfate for recovery. The recovery rates of zinc, manganese, copper, cadmium and iron were 92.4%, 93.3%, 99.3%, 91.4% and 1.1%, respectively. A leaching toxicity test for ZLR was performed after water leaching. The results indicated that the final residue was effectively detoxified and all of the heavy metal leaching concentrations were under the allowable limit.     

Optimization of operating parameters and kinetics for chloride leaching of lead from melting furnace slag

The feasibility and kinetics of lead recovery from the slag of traditional lead melting furnace using chloride leaching were investigated. The effects of operating parameters such as leaching time, NaCl concentration, FeCl₃ concentration, liquid/solid ratio, stirring rate, temperature, and particle size on recovery of lead were studied and the optimization was done through the response surface methodology (RSM) based on central composite design (CCD) model. The optimum conditions were achieved as follows: leaching time 60 min, 80 °C, stirring rate 800 r/min, NaCl concentration 200 g/L, FeCl₃ concentration 80 g/L, liquid/solid ratio 16, and particle size less than 106 μm. More than 96% of lead was effectively recovered in optimum condition. Based on analysis of variance, the reaction temperature, liquid/solid ratio, and NaCl concentration were determined as the most effective parameters on leaching process, respectively. Kinetics study revealed that chloride leaching of galena is a first-order reaction and the diffusion through solid reaction product and chemical reaction control the mechanism. The activation energy of chloride leaching of galena was determined using Arrhenius model as 27.9 kJ/mol.     

响应面法优化电炉炼钢粉尘中Zn的选择性浸出

研究浸出参数对电炉炼钢粉尘灰中选择浸出性Zn的影响,以Zn和Fe的浸出率为响应变量,以硫酸浓度、浸出温度、浸出时间和液固比为独立变量,采用基于三水平Box?Behnken的响应面法对浸出参数进行优化。对试验结果进行ANOVA分析和验证。在硫酸浓度为2.35 mol/L,浸出温度为25℃,浸出时间为56.42 min,液固比为5的条件下,可得到Zn的最大浸出率为79.09%, Fe的最小浸出率为4.08%。通过ANOVA分析表明,对Zn和Fe浸出率影响最大的因素为硫酸浓度和浸出温度。基于响应面法的模型与试验数据具有很好的一致性,Zn和Fe浸出率的相关系数分别为0.98和0.97。