Preparation method of alloy zinc dust special for mercury-free batteries

A technology of alloy zinc powder and battery, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as environmental pollution, and achieve the effects of convenient equipment operation, low production cost, and reduced hydrogen evolution.

Inactive Publication Date: 2008-10-22
潮州正龙电池工业有限公司
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Problems solved by technology

However, after this battery is discarded, it contains...

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  • Preparation method of alloy zinc dust special for mercury-free batteries
  • Preparation method of alloy zinc dust special for mercury-free batteries

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Embodiment 1

[0020] Example 1 as figure 1 Shown: a kind of preparation method of alloy zinc powder special for mercury-free battery, it is characterized in that: its production process comprises:

[0021] 1) Wash and dry the high-purity zinc ingots for later use.

[0022] 2) Put the high-purity powdered indium, bismuth, and aluminum of the added elements into the bottom of the graphite crucible of the power frequency induction furnace, and then put the dried high-purity zinc ingots on the top of the added elements; 350 parts by weight of zinc ingots, 0.105 parts by weight of indium Parts by weight, 0.105 parts by weight of bismuth, 0.0105 parts by weight of aluminum; the content of zinc in the high-purity zinc ingot is greater than 99.99%, and the content of impurity iron is less than 1ppm; the content of indium in the high-purity indium powder is greater than 99.99%, and the content of bismuth in the high-purity The content is greater than 99.99%, and the aluminum content in high-purity ...

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Abstract

The invention relates to a preparation method of zinc alloy powder special for Hg-free battery. The preparatin method of the invention includes the following steps: cleaned and dried high-purity zinc ingots and additional elements of high-purity powder of indium, bismuth and aluminum are put into a main frequency induction furnace and heated up to the temperature of 460 DEG C; the raw materials are melted, evenly mixed, and then poured into a heat preserving leaking package which is heated to 550DEG C for heat preservation; the zinc alloy solution is pulverized into powder by purified and compressed air jet in a pulverized settlement cylinder, then settled and condensed into solid particles in a double-layer pulverized settlement cylinder which is communicated with cooling water; a multi-layer rotating vibrating screen is used for screening and then the zinc powder with qualified granulation is put into a V-shaped mixer for even mixing; the zinc powder is packaged for oxidation prevention after being checked as qualified. The powder of the invention is totally consistent with the quality standard of Hg-free zinc alloy powder and is environmental protection due to no mercury pollution; the adopted pulverization method by compressed air jet has the advantages of simple process, convenient operation, low cost, low labor intensity and small occupied production area; the zinc alloy powder with indium, bismuth and aluminum added without environmental pollution can obviously reduce the amount of hydrogen evolution of the cathode.

Description

technical field [0001] The invention relates to a preparation method of zinc powder for batteries, in particular to a preparation method of special alloy zinc powder for mercury-free batteries. Background technique [0002] Alkaline zinc-manganese batteries use manganese dioxide as the positive electrode active material and zinc as the negative electrode active material. The action of zinc and lye will precipitate hydrogen gas, which will not only lead to a rapid decline in the capacity of the battery during storage and use, but also cause battery expansion and leakage. Therefore, traditional alkaline zinc-manganese batteries add mercury elements, and use amalgamation to increase the overpotential of hydrogen precipitation on the negative electrode to inhibit the precipitation of hydrogen gas on the zinc surface, thereby reducing the amount of hydrogen evolution at the negative electrode. However, after this battery is discarded, it contains mercury, which causes serious pol...

Claims

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Application Information

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IPC IPC(8): B22F9/08H01M4/42
CPCY02E60/10
Inventor 黄培龙黄伟杰林桑榆陈进金黄益基傅漫丹
Owner 潮州正龙电池工业有限公司
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