Investigation on possible use of palm Nutshells as Reductant for the Reduction of copper slag for copper recovery

M. Kalenga, Motshoea Thunka, D. Nyembwe
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Abstract

The depletion of ores from the first sources on one hand has led to using damped materials that contain valuable metals to be recycled while environmental threats are being targeted and on the other hand high price of reductant coupled with their depletion have caused a stir in the metallurgical industry. Many slags are currently recycled for the recovery of valuable metals while new reductants are being tested for eventually replace the generic reductants. In this work, copper slag from Water-jacket furnace have been used to recover copper in presence of raw palm nutshells as possible replacement of generic reductants. Characterisation of the copper slag, the palm nutshells and products were conducted using XRD, XRF and SEM-EDS. Results have shown that dominants elements in the slag were Fe 33.83 wt%, Zn 6.73 wt%, Cu 1.26 wt%. Raw palm nutshells analyses revealed 6.39 wt% moisture, 61.56 wt% volatile matters and 4.35 wt% ash content while fixed carbon amounted to be 27.89 % and loss of ignition (LOI) 91.8 %. The reduction experiments were conducted in a horizontal tube furnace at 1300 °C under argon to create an inert environment and efficiently test the reducing capability of the palm nutshells. The composition of the metal produced revealed 41.84 wt% Cu, 26.41 wt% Co and 31.75 wt% Fe. However, it was noticed that the miscibility of the metal and the slag was prominent. As a first attempt, results showed very promising and further investigations are required to reveal optimums
棕榈仁壳作为还原剂用于铜渣还原铜回收的可行性研究
一方面,从第一个来源的矿石的枯竭导致使用含有有价值金属的阻尼材料进行回收,而环境威胁是目标,另一方面,还原剂的高价格加上它们的枯竭在冶金工业中引起了轰动。目前,许多炉渣被回收用于回收有价金属,同时正在测试新的还原剂,以最终取代通用还原剂。本研究以水套炉铜渣为原料,在棕榈仁壳存在的情况下回收铜,作为通用还原剂的可能替代品。采用XRD、XRF和SEM-EDS对铜渣、棕榈仁壳及其制品进行了表征。结果表明,渣中主要元素为Fe 33.83 wt%, Zn 6.73 wt%, Cu 1.26 wt%。原始棕榈仁壳的水分含量为6.39 wt%,挥发物含量为61.56 wt%,灰分含量为4.35 wt%,固定碳含量为27.89%,失燃率为91.8%。在1300℃的水平管式炉中,在氩气条件下进行了还原实验,创造了一个惰性环境,有效地测试了棕榈仁壳的还原能力。所得金属的组成为41.84 wt% Cu, 26.41 wt% Co和31.75 wt% Fe。然而,注意到金属与炉渣的混相性很突出。作为第一次尝试,结果显示非常有希望,需要进一步的研究来揭示最佳方案
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