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为解决冰铜喷嘴单分散风环孔洞式设计对冰铜颗粒分散程度影响有限、且作用不均的问题,在维持现有分散风环外形尺寸不变的条件下,通过设置双层交错排布出风孔洞的形式增加分散风出风面积,同时弥补单风环孔洞作用不均的缺陷。此外,在不同的分散风环孔洞倾角结构条件下,开展了分散风总量为1 000 m3/h和1 500 m3/h的仿真寻优研究。研究表明,新型双分散风环结构能够在一定程度上提高冰铜颗粒在反应塔中的反应速率与反应程度,但增设竖直偏转角可能会引起炉内冰铜颗粒着火延迟的现象。因此,建议在仅保留孔洞的水平偏转结构条件下,将双环分散风的出口总流量提高至1 500 m3/h,以进一步改善冰铜颗粒在反应塔内的反应速率以及反应程度。 相似文献
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基于对反应塔中反应机理的理解,提出了一种用于生产高品位冰铜的新风速熔炼技术。这项新技术的特点是氧油烧嘴安装在精矿流管的中央,在反应塔塔壁上装有侧喷嘴,工业富氧空气通过烧嘴垂直喷入反应塔,同时,外界空气通过喷嘴水平吹入。这项新技术的优点已通过小型闪速炉试验所证实。 相似文献
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固态碳质燃料(如煤和焦炭)已经常用作闪速炼铜的代用能源,其结果大大节省了能源成本。此外,由于反应塔和沉淀池中化学势不同而使闪速炉工况得以改善。它包括:弃渣含Fe_3O_4及Cu降低;沉淀池炉底上升减至最小;上升烟道炉结易于清除。但是在低氧分压下熔炼使得某些微量元素富集于冰铜相中。热力学计算表明,某些Va族微量元素会富集于冰铜,难以造渣及挥发除去。所以,了解固态碳质燃料对闪速炼铜化学过程的影响对于优化实际操作显得十分重要。 相似文献
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在金冠铜业闪速熔炼高强度生产条件下,从反应塔不同高度上在线提取高温悬浮物料的水冷试样进行系列检测分析,研究了精矿粒子在反应塔中氧化、脱硫、熔化的过程,以及粒子的化学组成、物相组成、粒径沿反应塔轴向和径向的变化等,分析了这些过程和变化对闪速炉炉况的影响,最后对控制闪速炉炉况、改进精矿喷嘴和炉体设计等提出了建议。 相似文献
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介绍了Ausmelt"双顶吹"炼铜工艺,分析了熔炼过程不同物料入炉品位时冰洞品位的控制,得出熔炼过程合理的冰铜品位控制为:入炉品位≤20%,冰铜品位52%~55%;入炉品位≥20%,冰铜品位55%~60%。总结了熔炼炉工况、过程温度、热冰铜样断面形状颜色、电炉炉渣含硫变化等反馈来判断实时冰铜品位的操作经验。 相似文献
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从工业闪速炉及其排烟路径上的不同位置在线提取烟尘试样分析,研究了烟尘形貌、粒度等的变化及烟尘的形成条件,发现烟尘不是反应塔中没有反应的细颗粒精矿粒子,而是反应塔中未沉降到沉淀池的、过氧化的、粒度很小的熔融球形粒子;石英砂和吹炼渣粒子很难成为烟尘;反应塔高度对烟尘率有较大的影响,提高反应塔高度有利于降低烟尘发生率。提出了工业闪速熔炼生产中烟尘形成的过程机理。 相似文献
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冰铜水淬与实践 总被引:1,自引:0,他引:1
刘卫东 《有色金属(冶炼部分)》2009,(2)
简要介绍了冰铜水淬"INBA"系统在祥光铜业的生产工艺,分析了冰铜在水淬过程中产生爆炸的原因,阐述了冰铜性质、冰铜温度、水淬水压、相对水量等内外条件对沙状冰铜品质的影响,总结了"IN-BA"系统在生产实践中存在的问题和整改措施。 相似文献
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采用苏打-铁屑法单独处理基夫赛特炉铅冰铜,介绍了试验原理及过程,以粗铅直收率为考察指标在试验基础上探讨反应温度、铅冰铜与铁屑质量比、反应时间、搅拌次数、苏打与铅冰铜质量比对粗铅直收率的影响。试验结果表明:在温度为1 100℃、铅冰铜与铁屑质量比为6、反应时间120 min、搅拌次数为3次、苏打与铅冰铜质量比为6%条件下,粗铅直收率为90.53%,Cu、Zn在冰铜中富集含量分别提高6%左右和4%左右。有效实现金属铅与铅冰铜的分离及冰铜层中Cu、Zn等有价金属的富集。 相似文献
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采用CV、LSV等电化学方法研究了阴极电化学机制,同时通过SEM、XPS等表征方法考察亚硫酸铵对阴极表面、锰晶体结构的影响。结果表明:氢在不锈钢阴极表面析出和锰在不锈钢阴极表面沉积的起始电位分别为-0.95、-1.40 V;亚硫酸铵对析氢反应具有明显的抑制作用,降低锰沉积的电流,减小直流电耗。当亚硫酸铵用量为SeO2的4倍时,锰沉积电流效率高达67.42%,亚硫酸铵有望成为替代SeO2的添加剂。在沉积锰的小区域能谱图中,能捕捉到100%纯度的锰,利于后期高纯锰的研发。 相似文献
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K Wang CJ Martoff D Poanic WJ Cummings SS Hanna RC Byrd CC Foster 《Canadian Metallurgical Quarterly》1988,38(5):2478-2481
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The influence of the extrusion ratio on sintering behavior of cold-extruded powder mixture Ti-48A1 has been investigated.
Both pressureless reaction sintering and hot isostatic pressing (HIP) without encapsulation were carried out. Moreover, two-step
sintering,i.e., combination of pressureless sintering and HIP, was conducted. It was found that both porosity and pore size in reactively
sintered specimens largely decrease with increaseing extrusion ratio. For a given extrusion ratio, the porosity after pressureless
sintering decreases with increasing temperature. Although a reduction of porosity can be reached by directly HIP specimens,
the effect of applied pressure in case of combined treatments is strongly dependent on extrusion ratio. By applying an extremely
high extrusion ratio of 350, material with a porosity of only 0.7 pct has been prepared by pressureless sintering and subsequent
HIP without encapsulation while a reverse treatment route led to a porosity of5%. On the contrary, lower porosities were obtained for low extrusion ratios of 17 and 25 by HIP and following pressureless sintering.
The effect of extrusion ratio, as well as sintering temperature, was discussed. In addition, pore coalescing, gas penetration,
and swelling were considered in order to understand the effect of applying pressure. 相似文献
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The reaction between bovine rhodanese (thiosulfate:cyanide sulfurtransferase, EC 2.8.1.1) and reduced dithiothreitol has been studied. This reagent, in the absence of thiosulfate, reduces the amount of sulfur carried by rhodanese with formation of sulfide and oxidized dithiothreitol: E-S-SH + reduced dithiothreitol replaced by E-SH + HS- + oxidized dithiothreitol, (E = enzyme). An inactivation was observed at high dithiothreitol/enzyme ratios or at very low enzyme concentrations. The inactivation was not observed in the presence of thiosulfate and can be reversed by cyanide or thiosulfate. A thiosulfate reduction activity of rhodanese was also found using dithiothreitol as reductant. 相似文献
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The commonly encountered cardiovascular effects of intravenous indigo carmine administration is transient alpha-receptor stimulation, namely increased total peripheral resistance, diastolic and systolic blood pressure, and central venous pressure with decreased cardiac output, stroke volume and heart rate. These usually cause no problems and frequently go undetected unless the patient is monitored closely during that brief interval. However, significant problems occur occasionally and its use is not totally without risks. 相似文献