共查询到20条相似文献,搜索用时 62 毫秒
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基于矿物自动分析(MLA)技术,结合多种手段,对某硫化镍铜矿磨矿沉砂的进行了工艺矿物学研究。结果表明,沉砂主要由30%金属矿物和70%硅酸盐脉石矿物组成,其中目的元素镍、铜、钴、金、银、铂、钯含量分别为0.82%、1.10%、0.04%、0.75 g/t、10.50 g/t、0.23 g/t、0.13 g/t。独立的金矿物主要为合金相,独立的铂钯矿物包括合金相、砷化物和铋碲化物。金及铂钯矿物虽粒度细小,但部分已单体解离,且载体矿物大多为金属硫化物;银多以碲银矿形式赋存,碲银矿粒度细小,且银矿物大多呈包裹体分布于金属硫化物中。 相似文献
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针对失效有机铑催化剂,利用还原-磨选工艺富集铑。在还原过程中,添加剂促进铁晶粒长大并富集铑,再通过磁选分离富集含铑的铁精粉。研究表明最佳工艺参数为:还原温度1200℃,还原时间6 h,添加剂配比10%,煤粉配比5%,球磨时间45 min,磁场强度1.28×105 A/m。利用X射线衍射对磁选铁精粉进行了分析,磁选后主要物相为金属铁、铑,除去了大部分脉石。最终得到铁精矿品位88.67%,回收率92.74%,铑回收率为92.08%。本工艺具有还原温度低、收率高等特点,为失效有机铑催化剂富集提供一种途径。 相似文献
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为了研究含铜超低碳钢等温时效铜析出,对试验钢在950 ℃固溶,经650 ℃保温1、20、45 h和400~650 ℃保温1 h等温时效后,通过金相、扫描电镜和透射电镜观察及维氏硬度测试揭示等温时效对铜析出的影响规律。试验结果表明随着时效时间的增长,试验钢晶粒尺寸差别不大,但Cu时效析出颗粒的尺寸和形貌存在很大差异,反映在试验钢的平均硬度值发生变化:时效时间为1 h时,试验钢硬度值最高,平均硬度值达到189 HV;时效时间为20 h和45 h时硬度值降低,在160 HV左右。400~650 ℃保温1 h结果表明随着时效温度增长,试验钢的硬度呈现先上升后下降的趋势。 相似文献
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A new process recycling rhodium from organic waste containing rhodium in acetic acid industry is developed. Use the special affinity of base metal sulfides (FeS, Ni2S3 , CuS, etc.) on platinum group metals, adopting high nickel matte trapping-aluminothermic activation method to recovery rhodium from incinerator residue of organic rhodium waste. The method is shorter process, lower equipment requirement, and the higher activity of rhodium black. In pyrometallurgy enrichment process,the recovery rate of rhodium reached 94.65%, the full flow of rhodium recovery rate was 92.04%. 相似文献
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R. Markandeya S. Nagarjuna D.S. Sarma 《Journal of Materials Engineering and Performance》2007,16(5):640-646
Precipitation strengthening of Cu-3Ti-1Cd alloy has been studied using hardness and tensile tests, electrical resistivity
measurements, and transmission electron microscopy. The alloy exhibited a hardness of 117 Hv in solution-treated (ST) condition
and attained a peak hardness of 288 Hv after aging at 450 °C for 72 h. Electrical conductivity increased from 7%IACS (International
Annealed Copper Standard) in ST condition to 13%IACS on aging at 450 °C for 16 h. The alloy exhibited yield strength (YS)
of 643 MPa and ultimate tensile strength (UTS) of 785 MPa in peak-aged (PA) condition. Strengthening in Cu-3Ti-1Cd alloy in
PA condition is attributed to solid solution strengthening effect of cadmium (Cd) as well as fine scale precipitation of metastable
and coherent β′-Cu4Ti phase. On overaging at 450 or 500 °C, the alloy showed a decrease in hardness as a result of formation of equilibrium precipitate
β-Cu3Ti as continuous precipitation within the matrix and as discontinuous precipitation at the grain boundaries. While the tensile
properties are better, the electrical conductivity of Cu-3Ti-1Cd alloy is less than that of binary Cu-2.7Ti alloy. The strengthening
mechanism is the same in both binary and ternary alloys of Cu-Ti, i.e., precipitation of metastable and coherent β′-Cu4Ti phase. 相似文献
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利用交流阻抗(EIS)和极化曲线,结合扫描电镜(SEM)和能谱分析, 对常温下低碳钢在含H2S的模拟炼厂常减压塔顶冷凝水中的腐蚀电化学行为和不同浸泡时间下硫化物膜的生长过程进行了研究。结果表明,H2S对腐蚀反应的阴极过程有很大的促进作用,搅拌条件下尤甚;随介质pH值升高,其腐蚀性减弱。腐蚀浸泡初期(小于8h),电极表面硫化物膜的生长遵循抛物线机制,随浸泡时间的延长,硫化物膜变得疏松、易于破裂和脱落,并出现二次生长、修复过程,最终达到膜生长和溶解的平衡。实验条件下电极表面所生成的硫化物膜,不足以对碳钢起到保护作用。 相似文献