Method for producing nickel sulfate aqueous solution
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SUMITOMO METAL MINING CO LTD
- Filing Date
- 2022-10-11
- Publication Date
- 2026-06-23
AI Technical Summary
【0008】 第1発明によれば、硫化工程において、硫化終液の鉄と亜鉛の比率を亜鉛/鉄の重量比で0.6~10に調整しておき、中和工程において、粗硫酸ニッケル水溶液のpHを5.5~6.0にするので、亜鉛を含む沈澱物が生成されやすく、亜鉛濃度の低い硫酸ニッケル水溶液が得られる。また、硫化工程では亜鉛の沈澱を多くする必要がないので硫化剤の添加量を減少させ、その結果ニッケル沈澱物も多くしないようにしてニッケルロスを減少させることができる。 第2発明によれば、中和工程において、粗硫酸ニッケル水溶液のpHを段階的に上昇させるので、急激なpH上昇操作に伴う局所的な過度のpH上昇を抑えることができる。その結果、中和工程においても、中和剤の添加量を減少させ、ニッケル沈澱物を多くしないようにすることができる。 第3発明によれば、硫化終液の鉄と亜鉛の比率に加えて、鉄濃度、および亜鉛濃度を調整することにより、より亜鉛を含む沈澱物が生成されやすくなり、亜鉛濃度の低い硫酸ニッケル水溶液が得られる。
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Abstract
Claims
1. A sulfidation process involves adding a sulfidating agent to a crude nickel sulfate solution containing iron and zinc as impurities to produce a zinc sulfide precipitate, and then separating the solid-liquid to generate the final sulfidation solution and sulfidation precipitate. The process consists of a neutralization step in which air is blown into the sulfurized final liquid and alkali is added to produce a precipitate containing iron and zinc by oxidation neutralization reaction, and the neutralized final liquid and neutralized precipitate are produced by solid-liquid separation. In the sulfidation step, the ratio of iron to zinc in the sulfidation final solution is adjusted to a zinc / iron weight ratio of 0.6 to 10, and then in the neutralization step, the pH of the crude nickel sulfate aqueous solution, which is the sulfidation final solution, is set to 5.5 to 6.
0. A method for producing an aqueous nickel sulfate solution characterized by the following:
2. In the neutralization step, the crude nickel sulfate aqueous solution is sequentially passed through multiple reaction vessels connected in series, and the pH of the crude nickel sulfate aqueous solution is gradually increased from the first reaction vessel to the last reaction vessel, until the pH of the crude nickel sulfate aqueous solution in the last reaction vessel is set to 5.5 to 6.
0. A method for producing an aqueous nickel sulfate solution according to claim 1, characterized by the above.
3. The iron concentration of the sulfurized final solution is in the range of 200 to 800 mg / L, and the zinc concentration is in the range of 200 to 8000 mg / L. A method for producing an aqueous nickel sulfate solution according to claim 1 or 2, characterized by the above.