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A Mineralogical Investigation on Volatilization of Impurity Elements from Cu-Rich Polymetallic Concentrates During Roasting in Inert Atmosphere
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2021-01-06 , DOI: 10.1007/s11663-020-02051-z
Pande Nishant Prasad , Iris McElroy , Andreas Lennartsson , Caisa Samuelsson

Four different Cu-rich polymetallic concentrates are tested for volatilization of Sb and As during laboratory-scale roasting. The experiments are performed between 200 °C and 700 °C, at intervals of 100 °C and in an inert atmosphere. Sb volatilization is much less (maximum approximately 45 pct) than As volatilization (maximum approximately 95 pct) in these conditions at 700 °C. As volatilization is however limited from the concentrate having As mainly in a tetrahedrite solid solution ((Cu,Ag,Fe,Zn) 12 (Sb,As) 4 S 13 ). Sb and As retained in the roasted calcine are found in the low-melting liquid phase, formed at approximately 500 °C. This melt phase gets enlarged and enriched in Sb with an increase in temperature. However, there is noticeable As volatilization from this melt phase with the temperature approaching 700 °C. Furthermore, there is an early and relatively high Sb volatilization from the concentrate having Sb substantially as gudmundite. Micron-scale elemental redistribution in gudmundite in the 350 °C roasted calcine confirms its transformation at this temperature. Other Sb minerals did not undergo any detectable transformation at this temperature, suggesting that the significant Sb volatilization starting between 300 °C and 400 °C was primarily from gudmundite. This benign attribute of gudmundite featured in this work in the context of roasting should also be relevant from the geometallurgical perspective during concentrate production, where concentrates bearing Sb are considered substandard for further Cu extraction irrespective of the Sb mineralogy.

中文翻译:

惰性气氛焙烧过程中富铜多金属精矿杂质元素挥发的矿物学研究

在实验室规模的焙烧过程中,测试了四种不同的富铜多金属精矿的 Sb 和 As 挥发情况。实验在 200 °C 和 700 °C 之间进行,间隔为 100 °C,并在惰性气氛中进行。在 700 °C 的这些条件下,Sb 的挥发量(最大约 45 pct)远低于 As 的挥发量(最大约 95 pct)。然而,As 的挥发受限于主要在四面体固溶体中的具有 As 的浓缩物((Cu,Ag,Fe,Zn) 12 (Sb,As) 4 S 13 )。保留在焙烧煅烧物中的 Sb 和 As 存在于低熔点液相中,在大约 500 °C 形成。随着温度的升高,该熔体相变大并富含 Sb。然而,当温度接近 700 °C 时,该熔融相中有明显的 As 挥发。此外,从含有基本上作为古铜矿的 Sb 的精矿中存在较早且相对较高的 Sb 挥发。Gudmundite 在 350 °C 焙烧煅烧中的微米级元素重新分布证实了它在该温度下的转变。其他 Sb 矿物在此温度下未发生任何可检测到的转变,这表明在 300 °C 和 400 °C 之间开始的显着 Sb 挥发主要来自古铜矿。这项工作中在焙烧背景下的古铜锰矿的这种良性属性也应该与精矿生产过程中的地质冶金学角度相关,其中含有 Sb 的精矿被认为不符合进一步提取 Cu 的标准,而与 Sb 矿物学无关。Gudmundite 在 350 °C 焙烧煅烧中的微米级元素重新分布证实了它在该温度下的转变。其他 Sb 矿物在此温度下未发生任何可检测到的转变,这表明在 300 °C 和 400 °C 之间开始的显着 Sb 挥发主要来自古铜矿。这项工作中在焙烧背景下的古铜锰矿的这种良性属性也应该与精矿生产过程中的地质冶金学角度相关,其中含有 Sb 的精矿被认为不符合进一步提取 Cu 的标准,而与 Sb 矿物学无关。在 350 °C 焙烧煅烧中,gudmundite 中微米级元素的重新分布证实了它在该温度下的转变。其他 Sb 矿物在此温度下未发生任何可检测到的转变,这表明在 300 °C 和 400 °C 之间开始的显着 Sb 挥发主要来自古铜矿。这项工作中在焙烧背景下的古铜锰矿的这种良性属性也应该与精矿生产过程中的地质冶金学角度相关,其中含有 Sb 的精矿被认为不符合进一步提取 Cu 的标准,而与 Sb 矿物学无关。表明在 300 °C 和 400 °C 之间开始的显着 Sb 挥发主要来自古铜矿。这项工作中在焙烧背景下的古铜锰矿的这种良性属性也应该与精矿生产过程中的地质冶金学角度相关,其中含有 Sb 的精矿被认为不符合进一步提取 Cu 的标准,而与 Sb 矿物学无关。表明在 300 °C 和 400 °C 之间开始的显着 Sb 挥发主要来自古铜矿。这项工作中在焙烧背景下的古铜矿的这种良性属性也应与精矿生产过程中的地质冶金学角度相关,在这种情况下,无论 Sb 矿物学如何,含 Sb 的精矿被认为不符合进一步提取铜的标准。
更新日期:2021-01-06
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