ABSTRACT To promote biooxidation efficiency of a refractory high-sulphide gold concentrate, microwave technology has been applied. Two factors were investigated in the microwave stage including initial solution pH and microwave irradiation time. The results show that biooxidation efficiency of the gold concentrate increases with the increasing initial solution pH. The effect of microwave irradiation on biooxidation efficiency becomes negligible after 300 s. The optimal experiment conditions were initial solution pH of 7.00 and microwave irradiation time of 300 s. Using the irradiated sulphide concentrate, the biooxidation period decreased and the biooxidation efficiency increased. After microwave irradiation, the mineral particle surface was destroyed and became bumpy. Microwave contributed to the decrease of mineral particle size and the increase of specific surface area. A mechanism model shows that the increasing mineral surface area caused by microwave irradiation leads to the enhancement of biooxidation efficiency.

中文翻译：

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微波在难降解高硫精矿生物氧化中的应用：影响因素分析

摘要 为了提高难处理的高硫化金精矿的生物氧化效率，微波技术已被应用。在微波阶段研究了两个因素，包括初始溶液 pH 值和微波辐射时间。结果表明，金精矿的生物氧化效率随着初始溶液 pH 值的增加而增加。微波辐射对生物氧化效率的影响在 300 秒后变得可以忽略不计。最佳实验条件为初始溶液pH为7.00，微波照射时间为300 s。使用辐照硫化物精矿，生物氧化时间缩短，生物氧化效率提高。微波照射后，矿物颗粒表面被破坏，变得凹凸不平。微波有助于矿物粒径的减小和比表面积的增加。机理模型表明，微波辐射引起的矿物表面积增加导致生物氧化效率的提高。