共查询到20条相似文献,搜索用时 125 毫秒
1.
采用转底炉直接还原工艺,将铜渣含碳球团在高温条件下直接还原得到金属化球团和高品位氧化锌粉尘,再通过熔分或磨矿磁选方式将铁回收,得到的铁产品可作为冶炼含铜钢的原料.转底炉中试结果表明:采用"转底炉直接还原—燃气熔分"流程处理铜渣,可获得TFe品位94%以上、铁回收率93%以上的熔分铁水;采用"转底炉直接还原—磨矿磁选"流程处理铜渣,可获得TFe品位90%以上、铁回收率85%以上的金属铁粉;采用两种流程处理铜渣,均可获得锌品位60.02%的ZnO粉尘.结果表明,经过转底炉直接还原,铜渣中的铁橄榄石Fe_2SiO_4和磁铁矿Fe_3O_4相转变为含有金属铁Fe、二氧化硅SiO_2和少量辉石相Ca(Fe,Mg)Si_2O_6的金属化球团,具备通过磨选或熔分进行进一步富集的条件. 相似文献
2.
3.
4.
5.
6.
7.
8.
低品位铁矿石直接还原新工艺研究 总被引:2,自引:0,他引:2
对多种难选铁矿石进行了煤基直接还原和渣铁分离研究,提出了煤基直接还原──渣铁分离──还原铁粉冷固结成型的新的工艺流程。所得产品的铁品位、金属化率和铁回收率分别在90%、92%和84%以上。直接还原铁粉经冷固结成型后即为电炉炼钢的优质原料。该工艺为利用我国大量尚未开发的低品位难选铁矿石提供了新的途径。 相似文献
9.
开发了转底炉内铁矾渣含碳球团直接还原—熔分回收铁、烟气回收次氧化锌的联合工艺,研究了工艺参数对铁矾渣中铁和锌综合回收的影响。最佳工艺条件为:碱度2.5,配碳比1.4,还原温度1 300℃,还原时间30min,金属化率达到98.47%,铁回收率为95%,在还原阶段锌的挥发率达到94%,熔分结束锌的挥发率接近100%。在最佳工艺参数下进行了Φ3.0 m转底炉中试试验,得到全铁含量44.50%,金属铁含量34.71%,金属化率78%的金属化球团,锌挥发率达到92%。 相似文献
10.
11.
12.
《钢铁研究学报(英文版)》2016,(9):874-883
Direct reduction of high-phosphorus oolitic hematite ore based on biomass pyrolysis gases(CO,H_2,and CH_4),tar,and char was conducted to investigate the effects of reduction temperature,iron ore-biomass mass ratio,and reduction time on the metallization rate.In addition,the effect of particle size on the dephosphorization and iron recovery rate was studied by magnetic separation.It was determined that the metallization rate of the hematite ore could reach 99.35% at iron ore-biomass mass ratio of 1∶0.6,reduction temperature of 1 100℃,and reduction time of 55 min.The metallization rate and the aggregation degree of iron particles increase with the increase of reduction temperature.The particle size of direct reduced iron(DRI) has a great influence on the quality of the iron concentrate during magnetic separation.The separation degree of slag and iron was improved by the addition of 15 mass% sodium carbonate.DRI with iron grade of 89.11%,iron recovery rate of 83.47%,and phosphorus content of 0.28% can be obtained when ore fines with particle size of-10 μm account for 78.15%. 相似文献
13.
转底炉工艺是目前处理含铁尘泥最有效的工艺之一,但传统转底炉处理尘泥需要造球且只能铺设1~2层球团以致生产效率较低。针对该问题,料层厚度是传统工艺10~30倍的新型厚料层转底炉技术应运而生,同时无需造球并取消了燃烧装置,极大提高生产效率。基于计算流体力学(CFD)方法建立了新型厚料层转底炉工艺多孔介质异相反应直接还原数学模型,研究厚料层转底炉的工作特性,分别对厚料层转底炉内的还原性气氛、脱锌、金属化率进行分析与讨论。研究表明,厚料层转底炉物料出炉时脱锌率超过99%且金属化率达到90%以上,能够有效提升生产效率。研究结果丰富了转底炉工艺理论,并为新型厚料层转底炉工程化提供理论依据。 相似文献
14.
铁矿直接还原用台车连续炉 总被引:2,自引:0,他引:2
介绍一种用于铁矿直接还原的台车连续炉,含碳球团料层铺在台车上并通过炉膛进行焙烧和还原。此炉子已经成功地用于铁精矿粉还原焙烧,所得到的海绵铁产品的金属化率大于92%,全铁约90%。和转底炉比较,台车连续炉的优点是结构简单,供热点少,台车维修方便;主要缺点是台车运转速度不能太快,焙烧时间较长。 相似文献
15.
高铁氧化铝赤泥中铁回收技术研究 总被引:1,自引:0,他引:1
以高铁氧化铝赤泥为对象进行还原焙烧-磁选试验研究,从铁氧化物还原理论出发,分析其在还原气氛下的行为特点,重点研究了在不同种类添加剂类别及用量情况下,赤泥中铁氧化物还原效果及还原后的金属铁与其它非磁性成分分离效果。最终试验结果表明,实验条件为添加6%碳酸钠、6%硫酸钠时(还原条件:焙烧温度1 050℃、焙烧时间60 min、还原介质为褐煤),焙烧矿中铁的金属化率为90.16%,在一定条件下经磨矿磁选后铁精矿全铁品位为90.21%,铁回收率达到94.86%。 相似文献
16.
台车连续炉直接还原法 总被引:4,自引:0,他引:4
开发了一种在台车连续炉中实现铁矿直接还原的方法。台车连续炉的炉膛是直条形,炉底由若干个台车组成。含碳球团料层铺在台车上,通过炉膛时进行还原焙烧。为了得到高金属化率,在料层表面覆盖薄焦炭层保护。此方法已经成功地用于唐钢石人沟铁矿。生产线所用的炉子长70 m,宽2 8 m。炉底由26 个台车组成。用这种方法生产的海绵铁产品成分如下:金属化率大于92%,全铁约90%,硫小于0 08%。一座炉子的产量为5 t/h,总煤耗低于700 kg/t。和转底炉比较,台车连续炉的优点是:结构简单,供热点少,台车维修方便,主要缺点是台车运转速度不能太快,焙烧时间较长。 相似文献
17.
Recovery of Iron From High-Iron Red Mud by Reduction Roasting With Adding Sodium Salt 总被引:1,自引:0,他引:1
Red mud is the waste generated during aluminum production from bauxite, containing lots of iron and other valuable metals. In order to recover iron from red mud, the technology of adding sodium carbonate—reduction roasting—magnetic separation to treat high-iron red mud was developed. The effects of sodium carbonate dosage, reduction temperature and reduction time on the qualities of final product and the phase transformations in reduction process were discussed in detail. The results showed that the final product (mass percent), assaying Fe of 90.87% and Al2O3 of 0.95% and metallization degree of 94.28% was obtained at an overall iron recovery of 95.76% under the following conditions of adding 8% sodium carbonate, reduction roasting at 1050 ℃ for 80 min and finally magnetic separation of the reduced pellets by grinding up to 90% passing 0.074 mm at magnetic field intensity of 0.08 T. The XRD (X-ray diffraction) results indicated that the iron oxides were transformed into metallic iron. Most of aluminum mineral and silica mineral reacted with sodium carbonate during the reduction roasting and formed nonmagnetic materials. 相似文献
18.
摘要:含锌除尘灰是钢铁厂重要的固体废弃物,属于危废,为了探索妥善解决该种危废的方法,模拟回转窑工艺对国内某钢厂含锌除尘灰进行焙烧 磁选锌铁分离研究,研究不同焙烧温度、时间以及不同内配C含量对焙烧矿金属化率、脱锌率以及对磁选后精矿铁品位、Fe回收率的影响。结果表明,在C质量分数为12%、焙烧温度1100℃、焙烧时间60min的条件下,得到铁品位53.45%、金属化率91.95%、脱锌率99.05%的焙烧物料,挥发物中ZnO质量分数高达95.04%。焙烧物料经过磨矿磁选后可得到铁品位91.30%,Fe回收率82.37%的金属铁粉。 相似文献
19.
为了实现赤泥资源高附加值化综合利用,通过高温模拟试验对赤泥含碳球团还原焙烧-熔分过程进行研究。将赤泥含碳球团在1 200℃下进行还原焙烧,并结合相图分析,向粉碎后的焙烧球团中添加一定比例的CaO、Al_2O_3进行调质和熔分。结果表明,赤泥含碳球团在1 200℃下还原12min后金属化率可达91.3%,还原效果良好;在1 450℃下进行还原熔分,可实现渣铁的有效分离,金属铁收得率可达到90%以上,所得铁水质量符合炼钢要求;熔分渣中w(TFe)可降至0.5%以下,渣中主要物相为12CaO·7Al_2O_3、CaTiO_3和2CaO·Al_2O_3·SiO_2,通过熔点性能测试试验,熔化性能符合钢液脱硫条件。 相似文献
20.
Xiang-dong XING Jian-liang ZHANG Zhen-yang WANG Ke-xin JIAO Xing-le LIU Shan REN 《钢铁研究学报(英文版)》2014,21(7):653-659
Direct reduction of pyrite cinder in a rotary hearth furnace(RHF)was studied under the condition of laboratory simulation.Effects of reduction temperature,reduction time,molar ratio of carbon to oxygen,and CaO addition on metallization rate as well as compressive strength of the pellets after reduction were discussed.The results showed that the metallization rate and compressive strength were 93.9% and 2160Nper pellet respectively under the conditions of the reduction temperature of 1200℃,the reduction time of 16min,and the molar ratio of carbon to oxygen(xC/xO)of 1.0;adding 2.5% CaO was beneficial to sulfur enrichment in slag phase of pellet,and metallization rate increased slightly while compressive strength decreased. 相似文献