Abstract

A new approach is proposed to increase the recovery of Ni and Cu from the fly ash formed by roasting the copper–nickel matte in the production of nickel at PAO MMC Norilsk Nickel. This approach is based on the gas-phase treatment of fly ash in the HNO₃(vapor)–air or NO_x–H₂O(vapor)–air atmosphere with subsequent leaching of Ni and Cu with water. It is shown that nitrating media efficiently leach Ni and Cu from the bulk of the fly ash. It is determined that the pretreatment of the fly ash in a nitrating atmosphere at 70–150°C for 5 h makes it possible to reach the practically complete recovery of Ni and Cu with water (~100% of their total content in the fly ash). The recovery of Fe with water in this case does not exceed ~7% of its total content in the fly ash.

中文翻译：

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以 MMC Norilsk Nickel 生产的粉煤灰为例，对硝化介质中的冶金粉煤灰进行气相处理以提高有价值组分的回收率

摘要

提出了一种新方法来提高从 PAO MMC Norilsk Nickel 的镍生产过程中焙烧铜镍锍形成的飞灰中镍和铜的回收率。该方法基于在 HNO ₃（蒸气）-空气或 NO _x -H ₂ O（蒸气）-空气气氛中对飞灰进行气相处理，随后用水浸出 Ni 和 Cu。结果表明，硝化介质可以有效地从飞灰的主体中浸出 Ni 和 Cu。已经确定，在 70-150°C 的硝化气氛中对飞灰进行 5 小时的预处理可以使 Ni 和 Cu 与水几乎完全回收（飞灰中它们总含量的约 100%）。 ）。在这种情况下，Fe 与水的回收率不超过其在飞灰中总含量的 7%。