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Citation: DONG Qi, HAN En-Shan, YAN Yan-Bo, KANG Hong-Xing. Reuse of Mother Liquor with Crystal Seeds in Preparation of Nickel Hydroxide[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1009-1012. shu

Reuse of Mother Liquor with Crystal Seeds in Preparation of Nickel Hydroxide

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a Hebei University of Technology Lanffang Department, Lanffang 065000;
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b Institute of Chemical Engineering and Technology, Hebei University of Technology, Tianjin;
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c Hebei Langfang Technical School, Langfang

Corresponding author: DONG Qi,
Received Date: 8 October 2006
Available Online: 21 January 2007
Fund Project: 河北省自然科学基金资助项目(200006) (200006)

Ammonia is usually added as a complex agent in preparation of high electrochemical and spherical nickel hydroxide by chemical precipitation. As the result, a lot of liquid waste with ammonia has to be disposed. Studies show that part of the mother liquor with crystal seeds can be reused in the preparation. SEM, charge-discharge, and cycle life test were used to analyze the influence on nickel electrode of the content of crystal seeds and the quantity of mother liquid. Studies showed that the mother liquid with crystal seeds was much better than the one without crystal seeds in the field of surface and sphericity. When mother liquor with 6~9 g/L crystal seeds reacting for about 8 hours, the tap density of the nickel hydroxide can reached 1.90 g/cm³, the diameter of 10 μm and the discharge capacity of 200 mA·h/g. When the cycle content of mother liquid was less than 20%, the content of SO₄^2- could be less than 0.3%. Using 20% mother liquor with 6~9 g/L crystal seeds to react for about 10 hours, the discharge capacity of nickel electrode reached 215.06 mA·h/g. The discharge capacity of nickel electrode above 1.2 V is 153.33 mA·h/g, accounting for 71.3% of the discharge capacity. It not only improves the discharge capacity and reduces the dispose quantity of liquid waste with ammonia, but also improves the tap density and the spheroid degrees of nickel hydroxide. It also shortens the reaction time effectively.
- nickel hydroxide,
- preparation,
- seed,
- mother liquors,
- reuse
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