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Study on Recovery Process for Nickel and Cobalt from Spent Ni-MH Batteries

Author: YangZhiYuan
Tutor: WangLinShan;LiXuMing
School: Northeastern University
Course: Applied Chemistry
Keywords: Ni-MH battery Nickel sulfate Recover Leaching Extraction
CLC: X76
Type: Master's thesis
Year: 2008
Downloads: 165
Quote: 0
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Abstract


Scrap nickel hydrogen battery positive and negative plates contain a lot of valuable metals nickel and cobalt and precious rare earth elements , high resource value . But the difference is small , the content of each element of impurity elements , separation and recovery more difficult , and therefore how effective comprehensive recycling the valuable metals to become one of the topics that need to be urgently addressed . This study draws on the traditional wet method of recycling processes for different impurity elements , positive and negative , to take positive and negative methods of separation and recovery . In combination with acid leaching , inorganic the precipitate and organic solvent extraction processing anode materials, a used nickel-metal hydride battery recycling process overall . For the cathode material, the top of the sulfuric acid leaching process , and on this basis the use of P204 as extraction agent extraction purification leaching solution obtained optimum extraction impurity process : concentration of 10% with P204 , the extractant saponification was 65% of the water phase equilibrium pH value of 3.5 , the extraction equilibrium time of 10min, compared to 1:1 extraction stages 3 . Under this condition , the consolidated nickel and cobalt recovery of 95% or more . Anode material to study the the optimum leaching process using sulfuric acid dissolved the pretreatment conditions precipitated In addition to the rare earth elements and iron and aluminum , and then use the P204 further extraction impurity , the experimental optimum extraction Purifying Technology : P204 concentration of 10% , the the saponification rate is 65 % , the water phase equilibrium pH value of 3.5 , the extraction equilibrium time 10min, compared to 1:1 extraction stages 3 . Under such conditions , the nickel cobalt recoveries of 90% or more . This process to achieve the separation and recycling of used nickel metal hydride electrode material in a variety of metal elements . The process is simple , and the recovery is a viable recovery process .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Machinery, instruments and industrial waste treatment and comprehensive utilization
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