【摘要】 针对陕西山阳某难处理金矿中硫化物包裹金及碳质物"劫金"现象导致金浸出率低的问题,使用二氧化氯作为氧化剂,实验室自制复配表面活性剂DS-1作为碳质物抑制剂,DS-5作为浸出剂对该难处理金矿进行预处理—浸出条件试验。结果表明:在磨矿细度-23μm含量80%,使用二氧化氯0.6 kg/t预氧化1 h,预氧化后试样在碳质物抑制剂DS-1用量4.5 kg/t、碳质物抑制预处理时间0.5 h、预处理温度30℃条件下进行碳质物抑制预处理,预处理后矿样在浸金药剂DS-5用量为5 kg/t,矿浆pH=11.08,液固比3 mL/g以及浸出时间48 h的条件下浸出,最终金的浸出率为49.30%,相比于原矿在该条件下直接浸出的浸出率9.29%提高了40.01个百分点。更多还原

【Abstract】 With conventional cyanide leaching techniques,the leaching rate of the refractory gold ore from Shanyang in Shaanxi Province is extremely low due to the cover of gold by sulfides and the "preg-robbing" by carbonaceous matter.To liminate these effects thus improve the leaching rate,the process of chlorine dioxide oxidation pretreatment-inhibition of carbonaceous matter-leaching was proposed.The condition experiments were carried out with DS-1 as the inhibitor of carbonaceous matter and DS-5 as the leaching agent.Results indicated that with the grinding fineness of 80%-23 μm,the overall gold leaching rate is 49.30% under the following conditions:1 h oxidation pretreatment at 30℃ with 0.6 kg/t chlorine dioxide,0.5 h inhibition treatment with 4.5 kg/t DS-1,followed by 48 h leaching with 5 kg/t DS-5 and liquid-solid ratio of 3 mL/g at pH 11.08.With the process,the leaching rate has increased from initial direct cyanide leaching technique of 9.29% relative to that of 40.01 percentage points at the comparative conditions.更多还原