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點石成金——朝陽東大礦冶研究院主要業績巡禮(五)
來源: | 作者:pmo2087f8 | 發布時間: 2020-03-23 | 139 次瀏覽 | 分享到:

                                                                                                                     主要創新研究成果

                                                                                                              The Main Innovation Research

      9、變廢為寶 黃金氰化尾渣無害化處置與綜合利用技術
氰化尾渣是金精礦經氰化作業壓濾后排放的危險廢棄物,尾渣中含有氰根和重金屬等有害成分,部分尾渣中還含硫、鐵、金、銀、銅、鉛、鋅等多種有價組分。該類危險廢棄物長期堆存,不僅占用土地,污染環境,而且浪費了資源。部分黃金企業排放的氰化尾渣中鐵含量較高,鐵品位高達25%以上,且主要以赤(褐)鐵礦的物相形式存在,具有較高的回收價值。朝陽東大礦冶研究院針對高鐵氰化尾渣礦物組分復雜、毒害組分含量高的特點,成功開發了高鐵氰化尾渣預熱破氰解毒-蓄熱還原新技術,不僅實現了尾渣中氰化物分解解毒,還將弱磁性赤鐵礦還原為強磁性磁鐵礦,經磨礦-磁選實現高鐵氰化尾渣無害化高效利用。針對不同種類的黃金氰化尾渣無害化處置及高效利用技術,研究院目前與中國黃金集團有限公司、云南黃金礦業集團有限公司等企業已啟動相關研究及工程化應用工作。
       9.Turning waste into treasure 
The detoxification treatment and comprehensive utilization technology of the gold cyanidation residues
    Cyanidation residue is a hazardous waste from the pressurized filtration in the cyanidation process of the gold concentrate. It contains many harmful components including the cyanide ions, heavy metal and etc. On the other hand, some of the tailings also contain various valuable resources such as sulfur, iron, gold, silver, copper, lead, zinc etc. In the long run, the heaps of the hazardous waste not only take up land and contaminate the environment, but only squander those valuable resources contained. The cyanidation residues discharged by some gold businesses contain relatively high iron content with Fe grades over 25%. The iron contents mainly exist in the form of hematite or limonite with high value of recovery. Chaoyang NEU Minerals and Metallurgy Institute (CNMMI) has successfully developed the preheating – detoxification – heat storage – reduction technology, which conquers the complexity and toxicity of the high-iron-content cyanidation residues. The new technology realizes the decomposition and detoxification of the cyanides as well as reduces the weakly magnetic hematite content into strongly magnetic magnetite. The reduction enables the effective utilization of the high-iron-content residue through a grinding – magnetization process. To date, CNMMI has initiated the collaborative project on relevant research and industrial application with the companies of China National Gold Group Co., Ltd., Yunnan Gold Mining Group Co., Ltd. and so on, aiming at the detoxification and effective utilization of different types of gold cyanidation residues.

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