加压氧化处理黄金冶炼氰化废水  

Treatment of Cyanide Wastewater from Gold Smeltingby Pressurized Oxidation

作　　者：董文强 谢锋 王伟 白云龙 高腾跃 李光胜 DONG Wenqiang;XIE Feng;WANG Wei;BAI Yunlong;GAO Tengyue;LI Guangsheng(School of Metallurgy,Northeastern University,Shenyang 110819,China;Electrometallurgical Laboratory Branch of Shandong Gold Mining Science and Technology Co.,Yantai 261441,Shandong,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]山东黄金矿业科技有限公司选冶实验室分公司,山东烟台261441

出　　处：《有色金属（冶炼部分）》2024年第10期147-153,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点研发计划项目(2018YFC0604604)。

摘　　要：采用加压氧化方法对黄金冶炼氰化废水进行脱氰处理,研究了反应温度、氧分压、处理时间及酸度等对加压氧化降解氰化废水中总氰、硫氰根及重金属离子脱除规律的影响。结果表明,提高反应温度、氧分压、反应时间和酸度均有利于含氰废水中总氰的脱除,当反应温度80℃、氧分压0.3 MPa、反应时间1 h、酸化时浓硫酸用量0.31 mol/L时,总氰降至22.2 mg/L,静置两天后进一步降至7.73 mg/L,SCN-降至13.8 g/L,Cu降至30.3 mg/L,Fe降至3.21 mg/L,Zn降至2.2 mg/L。铜、铁、锌几乎全部分别以Zn3(Fe(CN)6)2、Cu2Fe(CN)6·2H2O和Fe4(Fe(CN)6)3的形式固定在沉淀物中,进而降低黄金冶炼废水的毒性。降解处理后的废水经调节pH后返回金矿氰化浸出工序,实现废水循环再利用。A pressurized oxidation method was adopted for the decyanidation of cyanide wastewater from gold smelting,and the effects of reaction temperature,oxygen partial pressure,reaction time and acidity on the removal of total cyanide,thiocyanate ion and heavy metal ions from cyanide wastewater degraded by pressurized oxidation were investigated.The results show that increasing the reaction temperature,oxygen partial pressure,reaction time and acidity are all favorable to the removal of total cyanide from cyanide-containing wastewater.When the reaction temperature is 80℃,oxygen partial pressure is 0.3 MPa,reaction time is one hour,and the dosage of concentrated sulfuric acid is 0.31 mol L during acidification,the total cyanide can reduce to 22.2 mg L and further reduce to 7.73 mg L after two days of static storage,the SCN-reduces to 13.8 g L,Cu reduces to 30.3 mg L,Fe reduces to 3.21 mg L,and Zn reduces to 2.2 mg L.Cu,Fe,and Zn are almost all immobilized in the precipitates in the form of Zn 3(Fe(CN)6)2,Cu 2 Fe(CN)6•2H 2 O and Fe 4(Fe(CN)6)3,respectively,which in turn reduces the toxicity of gold smelting wastewater.After pH adjustment,the degraded wastewater can be returned to the gold mine cyanide leaching process to realize the recycling of wastewater.

关 键 词：加压氧化 含氰废水 协同沉淀 

分 类 号：TF831[冶金工程—有色金属冶金] TF803