Effect of Power and Exposure Time on the Microwave-Assisted Roasting of Refractory Gold Ore

Materials Science Forum Pub Date : 2024-02-15 DOI:10.4028/p-l8nrjw

Abdul Hapid, S. Zullaikah, M. Mahfud, A. Kawigraha

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Abstract

Reserves of high-grade gold ore worldwide are decreasing, and some industries have started processing refractory gold ore. Refractory gold ore contains sulfide minerals such as pyrite (FeS2), chalcopyrite (CuFeS2), galena (PbS), and sphalerite (ZnS). Gold in refractory ores occurs as fine-size gold-bearing sulfide minerals. In this study, the microwave-assisted roasting method has been investigated as a pretreatment for a refractory gold ore. This method can provide rapid heating radiation, cause micro-cracks, and trigger the decomposition of sulfide minerals. The presence of additive helps in the oxidation of sulfide minerals. The microwave-assisted roasting was carried out using variations in microwave power and time. Microwave power between 300 - 600 watts significantly affected the increase in roasting temperature and weight loss of refractory gold ore. The highest temperature reached 567°C in roasting at 800 watts for 30 minutes. The optimum condition for microwave roasting was achieved at 400 watts of power with a roasting time of 30 minutes. Metals extraction of Cu, Zn, Pb, and Fe reached 97.2%, 82.7%, 16.1%, and 2.1% in water leaching.

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功率和暴露时间对微波辅助焙烧难熔金矿的影响

全球高品位金矿石的储量正在减少，一些行业已开始加工难选金矿石。难选金矿石含有硫化物矿物，如黄铁矿（FeS2）、黄铜矿（CuFeS2）、方铅矿（PbS）和闪锌矿（ZnS）。难处理矿石中的金是以细粒度的含金硫化物矿物形式出现的。本研究将微波辅助焙烧法作为难处理金矿石的预处理方法进行了研究。这种方法可以提供快速加热辐射，产生微裂缝，并引发硫化物矿物的分解。添加剂的存在有助于硫化矿物的氧化。微波辅助焙烧是通过改变微波功率和时间来实现的。300 - 600 瓦之间的微波功率对焙烧温度的升高和难熔金矿石的重量损失有明显影响。在 800 瓦的功率下焙烧 30 分钟，最高温度达到 567°C。微波焙烧的最佳条件是功率为 400 瓦，焙烧时间为 30 分钟。在水浸法中，铜、锌、铅和铁的金属提取率分别达到 97.2%、82.7%、16.1% 和 2.1%。

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Materials Science Forum

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