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对炼钢污泥的物化性能进行分析,结合实验室链蓖机——回转窑模拟试验装置进行的添加炼钢污泥浆球团试验,得出用浓度约30%的细粒炼钢污泥浆替代部分或全部造球水进行球团生产,有利于提高生球、预热球和成品球的各项性能,球团矿冶金性能指标也得到了改善。 相似文献
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目前传统的球团黏结剂是膨润土(一种富含SiO_2的黏土),它的添加会降低球团矿的含铁品位,寻找能够兼顾球团矿生球质量、成品球含铁品位和较低球团矿成本的优质膨润土,成为各球团矿生产单位的主要目标。通过在唐钢中厚板公司竖炉进行实地生产试验,对辽宁沙海膨润土矿业有限公司生产的两种膨润土与竖炉生产所用3种铁精粉,进行4种组合生产2种球团矿的方式,从生球质量、炉内操作参数、成品球质量、球团矿成本等方面,综合考察适宜中厚板公司球团矿生产的品种组合。试验结果表明:用复合膨润土生产普通球团矿时,球团矿的成球性能、干球抗压强度、成品球抗压强度及含粉率等指标是最好的,使用普通膨润土生产含钛球团矿比较合适。 相似文献
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介绍了利用回收的炼钢污水,提高竖炉球团生球强度,降低膨润土消耗的方法。炼钢污水浓度为27%,用罐车倒入竖炉造球储泥罐中,经筛板过滤后,由泥浆泵打入管道再通过污水喷头喷到造球盘中。工艺简单,投资小,成本很低,污水回收利用方便,利用率高,不占用场地,不污染环境,不需脱水、烘干和晾晒,可有效提高生球强度,降低膨润土消耗。 相似文献
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改性钠基膨润土在造球工艺中的试验研究 总被引:2,自引:0,他引:2
为提高球团矿品位 ,进行了以配加防爆剂改性钠基膨润土替代钙基膨润土的造球试验研究。结果表明 ,在 1#竖炉的原料条件下 ,添加 1.5 %的钠基膨润土和 0 .5 %防爆剂 ,生球性质与添加 5 %钙基膨润土相当 ,且爆裂温度大于 80 0℃。 相似文献
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膨润土作为一种黏结剂,在球团生产中广泛应用。在实际生产中添加一定量的膨润土能改善物料的成球性,提高生球强度及生球爆裂温度,稳定竖炉的生产操作,但由于膨润土SiO2含量较高,导致球团矿品位降低。通过实践理论计算,膨润土配比降低1个百分点,球团矿铁品位可提高0.6个百分点;高炉入炉料铁品位提高1个百分点,焦比可降低2%,产量可提高3%:经济效益、社会效益都十分明显。 相似文献
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为解决改性钠基膨润土在苯钢球团竖炉生产上的爆裂问题,进行了莱钢铁精粉添加配加防爆剂改性钠基膨润土的造球试验研究。 相似文献
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为了合理利用转炉污泥,减少炼铁流程中有害元素的富集,对转底炉处理转炉污泥进行了研究。结果表明,转炉污泥配入混合料后对生球质量影响较小,但可以提高干球的强度,因此可以减少球团在转运和预热阶段的破裂、粉化情况。混合料的碱度和碳质量分数是影响金属化球团质量的关键因素,而转炉污泥配入混合料后会对它们产生较大影响。将混合料的碱度控制在0.75~0.85,碳质量分数控制在11%~12%,可以保证金属化球团具有所需的强度和金属化率。工业试验过程中,转炉污泥配比从8%逐渐提高至24%,通过控制各原料配比来调节碱度和碳质量分数,金属化球团的质量能够满足生产需要。 相似文献
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为了获得低成本、质量好的球团矿产品,以两种铁精矿粉(低铁高硅磁铁矿和高铁低硅磁铁矿)和一种膨润土为原料,以生球落下强度、抗压强度以及焙烧后成品球团抗压强度为评价指标,在相同造球工艺和膨润土加入量的条件下,研究两种质量不同的铁精矿混合配料造球对球团性能的影响。研究表明,随着低铁高硅矿配比的增加,生球落下强度、抗压强度以及焙烧后成品球团抗压强度均随之降低。通过优化配矿,当低铁高硅矿配比达40%时,生球的落下强度达到3次以上,抗压强度达20N以上,焙烧后抗压强度为3850N,完全满足生产要求。 相似文献
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为了解决黏性姑山赤铁精矿(姑精矿)用于烧结生产引起烧结质量指标降低,球团生产混合料难以混匀,球团质量变差,生产波动大等问题,开展了将姑山磁铁精矿B精、C精和姑精矿在矿浆状态下预先混匀成姑山混合精矿实验,并研究了姑精矿粒度、配比等因素对生球制备、球团预热焙烧制度和球团性能的影响。结果表明:在矿浆状态下混匀可使姑精矿在姑山混合精矿中分布均匀,添加姑精矿润磨后,造球混合料细粒级含量增加,姑精矿较磁铁精矿润磨性能好;使用造球混合料2号造球,生球落下强度为7.8次/(0.5 m),较磁铁精矿生球落下强度提高1.3次/(0.5 m)。在预热温度950℃、预热时间18 min、焙烧温度1 200℃、焙烧时间20 min时,焙烧球团强度为2 987 N/球,较磁铁精矿混合料焙烧球团强度降低129 N/球,姑精矿的加入对球团的焙烧强度不利。生产中可以通过适当提高焙烧温度或姑精矿细度的措施来满足高炉对球团强度的要求。 相似文献
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Joseph A. Halt 《Mineral Processing and Extractive Metallurgy Review》2017,38(2):73-82
Organic binders are often desired when making low-silica iron ore pellets. Corn and wheat are grown in large quantities near certain iron ore pelletizing facilities and their starches are easily modified to form cold-water-soluble powders that can be used as binders. We investigated how starch cold-water solubility, starch dose, starch hydration time, green ball moisture content, and firing temperature affected pellet quality. With a fluxed, hematite concentrate, the high-soluble starch led to good wet and dry balls, but weak and friable indurated pellets compared to the standard binder, bentonite clay. As expected, the low-soluble starch did not make as good green balls as the high-soluble starch. Thermogravimetric analyses of unfired pellets and their abrasion products showed that modified starch was inhomogeneously distributed in pellets, with a high concentration near the ball surfaces. The surface concentration increased, and the core concentration decreased, as pellets grew during the pelletizing process. This suggests that starch enrichment near surfaces is a consequence of the agglomeration–compaction process, and may occur with other pelletizing binders. Abrasion mass losses were 81% greater with modified starch than with bentonite at 1100°C, and 31% greater at 1250°C. However, starch contents near the surfaces did not qualitatively correlate to roughness, as the highest starch dose tested gave the smoothest and least dusty pellets. 相似文献
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Youlian Zhou Pradchaya Wattanaphan 《Mineral Processing and Extractive Metallurgy Review》2017,38(2):126-131
Modified humic acid (MHA) binder consists of high molecular weight organic molecules and inorganic part. It is extracted from lignite coal with sodium hydroxide and used in pelletization of iron ore concentrates. Our previous study shows that MHA binder is also a potential binder instead of bentonite for pelletizing of fluxed hematite. For evaluating the use of MHA binder in pelletization of fluxed hematite, pelletizing tests were conducted to optimize parameters, such as dose, firing temperature and time. The results show that the qualities of green/dried balls with 0.6 wt% MHA binder are equal to or even better than that of 0.66 wt% bentonite pellets, and that both are much higher than the minimum requirements of the pellets’ strengths. The compression strength of fired pellets also suggested that MHA binder is promising to completely replace bentonite in pelletizing of fluxed hematite concentrate. However, the abrasion rate of the fired pellets with MHA binder is slightly higher than that of bentonite pellets. 相似文献
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竖炉球团加有机粘结剂的经济效益 总被引:1,自引:0,他引:1
选择膨润王最便宜的球团厂为例,计算分析添加人格伉的有机粘结剂后的经济效益.球团矿只有实行优质优价政策,竖炉球团有可能使用有机粘结剂.计算结果表明,在年产30万吨球团矿的条件下,当TFe品位提高1%,售价增加7~9元/t时,投篱产出的利润为70.、!154.1万元/a。 相似文献