东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (2): 262-269.DOI: 10.12068/j.issn.1005-3026.2024.02.014

• 资源与土木工程 • 上一篇    

某金矿氰化尾渣氧化焙烧无害化处置及机理研究

宋岩1,2, 赵冰1,2, 李艳军1,2, 赵羚伯1,2   

  1. 1.东北大学 资源与土木工程学院,辽宁 沈阳 110819
    2.东北大学 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
  • 收稿日期:2022-05-03 出版日期:2024-02-15 发布日期:2024-05-14
  • 作者简介:宋 岩(1998-),男,山东临沂人,东北大学硕士研究生
    李艳军(1972-),男,内蒙古赤峰人,东北大学教授.
  • 基金资助:
    辽宁省“兴辽英才计划”项目(XLYC1907162);中央高校基本科研业务费专项资金资助项目(N2130001)

Study on Harmless Disposal and Mechanism of Cyanide Tailings of a Gold Mine by Oxidation Roasting

Yan SONG1,2, Bing ZHAO1,2, Yan-jun LI1,2, Ling-bo ZHAO1,2   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.National and Local Joint Engineering Research Center for Efficient Development and Utilization of Refractory Iron Ore Resources,Northeastern University,Shenyang 110819,China. Corresponding author: ZHAO Bing,E-mail: zhaob@mail. neu. edu. cn
  • Received:2022-05-03 Online:2024-02-15 Published:2024-05-14

摘要:

针对某金矿氰化尾渣络合氰化物占比极高的特点,采用氧化焙烧工艺处理氰化尾渣.试验结果表明,将氰化尾渣样品在焙烧温度550 ℃,焙烧时间30 min,O2体积分数20%,总气量600 mL/min条件下进行氧化焙烧试验,可将氰化尾渣中的总氰化物含量降至检出限0.04 mg/kg以下,同时硫元素保留率达到82.22%.针对相应的铁氰络合物K4Fe(CN)6进行热重分析,结果表明K4Fe(CN)6首先被氧化为KCNO,进而氧化为K2CO3,两阶段均伴随有CO2,CO,NO2,NO等气态产物生成,且第一阶段伴随有副反应发生.该工艺不仅可以将氰化尾渣中的氰化物特别是络合氰化物有效分解,同时可保证尾渣中硫元素不易被氧化,大幅减少后续烟气脱硫成本,具有广泛的应用前景.

关键词: 氰化尾渣, 焙烧, 络合氰化物, 氧化分解, 无害化处置

Abstract:

In view of the high complex cyanide ratio in cyanide tailings of a gold mine, the process of oxidation roasting was adopted to treat cyanide tailings. The results showed that the total cyanogen content in cyanidation tailings could be reduced below the detection limit 0.04 mg/kg when the samples were roasted at 550 °C for 30 min, at 20% O2 volume fraction and a total gas of 600 mL/min, at the same time, the sulfur retention rate reached 82.22%. Thermogravimetric analysis of the corresponding ferricyanide complex K4Fe(CN)6 showed that K4Fe(CN)6 is first oxidized to KCNO, and then oxidized to K2CO3. Both stages are accompanied by gaseous compounds such as CO2, CO, NO2 and NO, and the first stage also involves sub-reactions. The process can not only effectively decompose cyanide, especially complex cyanide in the cyanide tailings, but also avoid the easy oxidation of sulfur element in the tailings, greatly reducing the cost of subsequent flue gas desulfurization, and has broad application prospects.

Key words: cyanide tailings, roasting, complex cyanide, oxidative decomposition, harmless disposal

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