某氰化尾渣预氧化——蓄热还原同步提铁试验研究  

Experiment Study on Synchronous Iron Extraction of Pre-oxidation and Heat-retaining Reduction for a Cyanide Tailings

作　　者：赵羚伯 赵冰[1,2] 高鹏 董再蒸[1,2] ZHAO Lingbo;ZHAO Bing;GAO Peng;DONG Zaizheng(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]难采选铁矿资源高效开发利用技术国家地方联合工程研究中心,辽宁沈阳110819 [3]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《金属矿山》2022年第7期170-174,共5页Metal Mine

基　　金：国家自然科学基金项目(编号:52004056);辽宁省“兴辽英才计划”项目(编号:XLYC1908017,XLYC1907162);中央高校基本科研业务费专项(编号:N2130001)。

摘　　要：辽宁新都黄金选金焙烧氰化尾渣总氰含量719 mg/kg,尾渣中铁矿物主要以赤铁矿的形式存在,TFe品位为35.08%。采用预氧化—蓄热还原同步提铁技术处理氰化尾渣,可实现在氰化物高效分解的同时回收铁精矿。研究结果表明,将氰化尾渣样品预先在550℃的空气气氛下焙烧25 min,可将氰化尾渣中的总氰含量降至检出限以下,同时完成对氰化尾渣的蓄热。将预氧化处理后的尾渣在还原温度560℃、还原时间30 min、CO浓度40%、总气量500 mL/min的条件下进行蓄热还原试验。焙烧产品使用棒磨机磨至-0.038 mm占82.02%,后在磁场强度143.28 kA/m条件下进行弱磁选,最终得到TFe品位58.94%,回收率89.93%的铁精矿。该工艺不仅将氰化物有效分解,还实现了氰化尾渣中铁矿物的高效回收利用。The total cyanide contents of a gold-selecting roasting cyanide tailings from Liaoning Xindu Gold is 719 mg/kg.The main iron minerals in residue is mainly hematite and the TFe grade is of 35.08%.The iron concentrate could be recycled from the cyanide tailings with the decomposition of cyanide efficiently by synchronous iron extraction of per-oxidation and heat-retaining reduction.The results showed that the total cyanide content in cyanide tailings can be reduced to below the detection limit at 550℃,25 min in the cyanide-oxidation stage,and the heating of the tailings was completed.Then,under the condition of reduction temperature of 560℃,reduction time of 30 min,CO concentration of 40%,gas flow of 500 mL/min,the heat-retaining reduction tests was carried out.The iron concentrate with a TFe grade of 58.94%and the recovery of 89.93%was obtained by low intensity magnetic separation at magnetic field intensity of 143.28 kA/m after being ground to-0.038 mm accounting for 82.02%by rod mill.This process can not only oxidize the cyanide effectively,but also realize efficient recovery and utilization of iron minerals from cyanide tailing.

关 键 词：氰化尾渣 蓄热还原 磁化焙烧 磁选 

分 类 号：X753[环境科学与工程—环境工程]