Method for manufacturing lithium adsorbent granules

JP7877643B2Active Publication Date: 2026-06-23SUMITOMO METAL MINING CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUMITOMO METAL MINING CO LTD
Filing Date
2021-06-30
Publication Date
2026-06-23

AI Technical Summary

Benefits of technology

【0009】 第1発明によれば、混錬工程と造粒工程とを経た後に、第1造粒体を焼結する焼結工程が設けられていることにより、リチウム吸着剤の前駆体に含まれているマンガンの価数を2から4に変えることができる。リチウム吸着剤の前駆体には、2価のマンガンが4価にならずに残存し、その2価のマンガンが溶離工程で溶出することが考えられていたが、焼結工程が設けられることにより、2価のマンガンのほとんどが4価のマンガンに変わる。4価のマンガンは、水に溶けにくいため、溶離工程でのマンガンの溶出を抑制できる。これにより、商業ベースでの生産において、リチウム吸着剤を繰り返し使用することが可能となる。また、本願のリチウム吸着用造粒体が溶離工程で使用されると、溶離工程で得られる溶離液内のマンガン濃度を抑制できるので、溶離工程以後の工程の負荷を軽減できる。 また、焼結工程での焼結温度が520℃以上600℃以下であることにより、さらに確実に2価のマンガンを4価のマンガンとすることができるので、マンガンの溶出をより抑制できる。

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Patent Text Reader

Abstract

To provide a method for producing granules for lithium adsorption in which elution of manganese in an elution process can be sufficiently suppressed in the case of producing lithium on a commercial basis.SOLUTION: A method for producing granules for lithium adsorption includes: a kneading process of kneading powder of precursor of lithium adsorbent and binding agent to obtain a kneaded product; a granulating process of mold-processing the kneaded product to obtain first granules; and a sintering process of sintering the first granules to obtain second granules. With this constitution, a valence of manganese included in the precursor of the lithium adsorbent can be changed from 2 to 4, and elution of manganese in an elution process can be suppressed. Further, it becomes possible to repeatedly use the lithium adsorbent in production on a commercial basis. Additionally, because manganese concentration in eluate obtained in the elution process can be suppressed, a burden of processes on and after the elution process can be lightened.SELECTED DRAWING: Figure 1
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Claims

[Claim 1] A mixing process involves mixing a precursor powder of a lithium adsorbent with a binder to obtain a compound, A granulation step is performed to mold the aforementioned compound to obtain a first granulated body, The process includes a sintering step of sintering the first granule to obtain a second granule, The sintering temperature in the aforementioned sintering process is 520°C or higher and 600°C or lower. The holding time at the sintering temperature is 4 hours or more and 6 hours or less. The binder is at least one of the following: an inorganic binder, a viscous binder, a cellulose-based binder, or a polymer binder. A method for producing lithium-adsorbent granules, characterized by the above.