共查询到20条相似文献,搜索用时 774 毫秒
1.
近期,由于增加烧结矿石中褐铁矿的配比,导致烧结料层透气性和烧结矿成品率降低。一般认为,虽然烧结料层是多孔的结构,但烧结过程中料层中孔隙的崩溃导致这一系列问题。一些方法如通过在烧结混合料中插入棒条等松料器控制空隙率,改善料层透气性。但却带来安装和维护费用等问题。因此,对通过改变原料颗粒粒度控制料层结构,或调节局部料层的松散密实程度等措施进行了讨论。本文中,进行了烧结混合料中配加大颗粒料改善料层透气性的烧结杯实验。并讨论了该烧结混合料的烧结行。研究发现:粉料中配加大颗粒料后,粉料部分料层的堆密度降低。因此透气性增大,烧结垂速加快。同时,增加焦粉配比可以保持烧结矿成品率维持不变。结果,烧结产能大幅度提高。 相似文献
2.
3.
为开发利用储量丰富、价格低廉的红土镍矿,本文在不提高总配碳量的条件下,通过改变上下料层混合料中固体燃料的占比,进行红土镍矿双层配碳烧结试验,研究新工艺的烧结性能及其对混合料制粒性能的影响,并分析烧结烟气中污染物的变化规律。结果表明:双层配碳烧结可使上下料层热量分布更均匀,降低下料层的过熔现象,改善制粒效果,增强烧结过程料层透气性,使无烟煤燃烧更加充分,并大幅提高烧结性能;与基准试验相比,两组试验烧结矿的成品率分别提高7.99%和10.40%,转鼓强度分别提高6.77%和5.34%,利用系数分别提高0.29、0.20 t/(m2·h),固体燃料消耗分别降低15.80、22.59 kg/t,烧结矿性能均有大幅度提高;双层配碳烧结有助于减少污染物排放,其中NOx和SO2排放量均减少31.14%和61.35%,有利于环境保护。 相似文献
4.
5.
6.
通过数学模型分析研究了采用气循环烧结法时,烧结料层吸入气体中的氧和水蒸气对烧结反应的影响。通过烧结杯试验,探讨了氧和水蒸气含量变化对烧结时间、成品率、烧结料层内温度被动等的影响。随差点及入含量的下降,烧结速度、烧结料层最高温度及成品率都下降。当增加吸入气体中的水分时,烧结料层内同温度下降。因为水分蒸发需要时间。同时,由于烧结料层表面热量减少,使料层内水冷凝区气流阻力增大,结速度也下降。如果在降低氧 相似文献
7.
8.
9.
10.
11.
纳米硬质合金烧结技术进展 总被引:8,自引:0,他引:8
介绍了用于纳米硬质合金烧结的压力烧结、场辅助烧结、微波烧结、二步烧结等新技术,在评价各种烧结方法的基础上,以实验依据充分论证了普通真空烧结在纳米硬质合金制备中的可行性。 相似文献
12.
A comparative study has been made of the processes involved in the consolidation of nanosized barium titanate powders by nonisothermal sintering at a linear heating rate, by rate-controlled sintering, and high-pressure sintering (up to 5 GPa). The use of linear heating and high-pressure has been found to be ineffective for obtaining nonporous ceramics (residual porosity of about 2%) and for miniziming grain growth. The application of external pressure does not prevent coalescent grain growth controlled by surface diffusion. When rate-controlled sintering is employed a densification/grain growth optimum can be attained with a relative density of 99.9% of the theoretical value and a grain size of about 100 nm. 相似文献
13.
14.
介绍了攀钢钒炼铁厂360 m2烧结机自投产以来,通过采取一系列的攻关措施,如解决设备问题,提高烧结 机作业率;工艺改进、烧结强化,提高烧结机利用系数;强化生产操作,提高烧结矿质量;实现了烧结矿产质量的提 高。2010年利用系数为1.415 t/(m 2 ·h)、作业率为96.52%、转鼓强度为73.27%,固体燃耗为45.27 kg/t,2011 年1-6月平均利用系数为1.425 t/(m 2 ·h)、作业率为97.39%、转鼓强度为73.61%,固体燃耗为47.96 kg/t。 相似文献
15.
16.
In order to obtain good sintering performance, it is important to understand sintering properties of iron ores. Sintering properties including chemical composition, granulation and high-temperature behaviors of ores from China, Brazil and Australia. Furthermore, several indices were defined to evaluate sintering properties of iron ores. The results show that: for chemical composition, Brazilian ores present high TFe, low SiO2, and low Al2O3 content. For granulation, particle diameter ratio of Brazilian ores are high; particle intermediate fraction of Chinese concentrates are low; and average particle size and clay type index of Australian ores are high. For high-temperature properties, ores from China, Brazil and Australia present different characteristics. Ores from different origins should be mixed together to obtain good high-temperature properties. According to the analysis of each ore′s sintering properties, an ore blending scheme (Chinese concentrates 20%+Brazilian ores 40%+Australian ores 40%) was suggested. Moreover, sinter pot test using blending mix was performed, and the results indicated that the ore blending scheme led to good sintering performance and sinter quality. 相似文献
17.
基于酒钢现有的原料条件,进行了强化烧结添加剂的工业性试验研究。主要通过配加0.5‰的洛阳隆越强化烧结添加剂,研究其在酒钢烧结厂全精矿烧结生产中对烧结矿产质量及消耗指标的影响。 相似文献
18.
Fe-Mo-B Enhanced Sintering of P/M 316L Stainless Steel 总被引:1,自引:0,他引:1
Liquid-phase enhanced sintering of powder metallurgy(P/M)316L stainless steel by addition of sintering aids was studied.2%-8% of pre-alloyed Fe-Mo-B powder with two different particle sizes was added as sintering aids,and the specimens were sintered in vacuum at 1 200-1 350 ℃.The results show that the fine Fe-Mo-B powder(5-10 μm)has stronger activated effect.The sintered density increases with the increase in sintering aid content or sintering temperature.Warm compaction has a better effect on the control of dimensional precision of compacts.The prealloyed Fe-Mo-B powder deviated from Mo2FeB2 component can also be sintering aid of P/M 316L stainless steel. 相似文献
19.
20.
LIUZheng-ping WANGYi-fang WUJin-bo 《钢铁研究学报(英文版)》2004,11(5):1-7
As one of the biggest iron and steel companies in China, Handan Iron and Steel Co has made a substantial progress in the sintering process. The mini-pellet sintering technology has been successfully applied based on lab investigation and industrial trials. Equipment enlargement was realized through replacing small sintering strands with the construction of huge sintering machine with a grate area of 400 m^2. The productivity, iron content and the metallurgical properties of sintering process have been improved. 相似文献