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Process for production of hydrogen-storing alloy composition

A technology of hydrogen storage alloy and manufacturing method, applied in chemical instruments and methods, hydrogen, non-metallic elements, etc., can solve problems such as low recovery rate

Active Publication Date: 2012-07-11
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it has been gradually known that when the constituent elements of the hydrogen storage alloy are reclaimed from spent nickel-hydrogen batteries, if the negative electrode main body recyclate containing a large amount of negative active material is heat-treated in a hydrogen atmosphere, the positive active material contained in a small amount, In particular, hydroxides such as nickel hydroxide oxidize rare earths (La, Ce, Pr, Nd, Sm, etc.), so the recovery rate of rare earths is lower compared to other hydrogen storage alloy constituent elements

Method used

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  • Process for production of hydrogen-storing alloy composition
  • Process for production of hydrogen-storing alloy composition
  • Process for production of hydrogen-storing alloy composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] After freezing and deactivating the spent nickel metal hydride batteries with liquid nitrogen, dry crushing with a biaxial shear crusher, then wet crushing with a dismantling grinder, and washing with water to remove plastics and paper, etc. , and then use a sieve (28 mesh) to classify, and perform magnetic separation on the non-classified material on the sieve with 2000-3000 Gauss, thereby removing the negative electrode Fe substrate. The fractionated product under the sieve is a negative electrode active material main body recovery product (negative electrode main body recovery material) in which the hydrogen storage alloy of the negative electrode is concentrated.

[0101] The proportion of the negative electrode active material in this negative electrode body recovery product (also referred to as "recycled raw material") was 88% by mass, the positive electrode active material etc. were mixed in the remainder, and the Co concentration was 9.6% by mass.

[0102] In ad...

Embodiment 2-6

[0113] (Example 2-6, Comparative Example 2)

[0114] A product (hydrogen storage alloy composition) was obtained in the same manner as in Example 1, except that the amount of granular aluminum added, the mass of the aluminum foil wrapping it, and the composition of the molten alloy to which they were added were varied as shown in Table 2. .

[0115] The obtained product (hydrogen storage alloy composition) was subjected to ICP analysis, and the results are shown in Table 1 below. Each numerical value in Table 1 is by mass %.

[0116] Table 1

[0117]

[0118] The dissolution rate (mass %) of the treated negative electrode body recovery material in Table 2 below is a value calculated by the following formula.

[0119] Dissolution rate of Co (%)=(Co content in hydrogen storage alloy composition after casting / Co content in recycled raw material)×100

[0120] Table 2

[0121]

[0122] (investigation)

[0123] From this, it can be seen that by putting aluminum and the r...

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Abstract

Disclosed is a method which can increase the dissolution efficiency in the thermal dissolution of a negative electrode active material or a composition mainly composed of the negative electrode active material that has been collected from a waste nickel-hydrogen battery, by introducing the negative electrode active material or the composition into a molten product of an alloy of an element constituting the negative electrode active material. The dissolution efficiency of the negative electrode active material or the composition mainly composed of the negative electrode active material can be increased dramatically by adding aluminum to the molten product of the alloy simultaneously with or subsequent to the addition of a negative electrode main collection product.

Description

technical field [0001] The present invention relates to a method for remanufacturing a hydrogen storage alloy composition from a spent nickel-hydrogen secondary battery. Background technique [0002] As a method of recovering nickel, cobalt, and rare earth metals as valuable metals from waste nickel-hydrogen secondary batteries, for example, the following method is proposed: the battery is crushed, disassembled, pulverized, and sieved, and then separated into coarse particles (plastics). , iron, nickel substrates, etc.) and the fine particle portion (nickel hydroxide, hydrogen storage alloy), the fine particle portion is dissolved using sulfuric acid containing alkali metal, and after impurities are removed from the nickel solution containing cobalt, electrolytic treatment is performed, thereby Metallic nickel and nickel-cobalt alloys are recovered (Patent Document 1). [0003] And, report following insight: when recovering valuable metal by waste nickel-hydrogen secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00H01M4/38
CPCY02E60/124C22C19/03H01M4/383C22B7/003H01M10/345H01M4/46C01B3/0031H01M10/54H01M4/26Y02E60/327H01M4/242Y02E60/10Y02E60/32Y02P10/20Y02W30/84
Inventor 荫井慎也宫之原启祐井上秀利菊川真吾畑祥巳
Owner MITSUI MINING & SMELTING CO LTD
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