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Method of prepn of ferrite from waste zinc-magnesium battery

A zinc-manganese battery and ferrite technology, which is applied in battery recycling, chemical instruments and methods, and solid waste removal, etc., can solve the problems of the limitation of zinc-shell battery preparation method, the difficulty of ferrite, and the unstable composition. Achieve high economic value and social value, easy implementation, and the effect of solving environmental pollution

Inactive Publication Date: 2005-03-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In addition to zinc-manganese batteries with zinc shells, a considerable number of waste zinc-manganese batteries produced in the society now have iron shells. In the process of preparing precursors for batteries, it is also necessary to consider recycling the mercury in them, which makes zinc-shell batteries The preparation method has limitations
Furthermore, the composition of each element in different waste batteries is not fixed, and the composition ratio of each element in the prepared ferrite is different, which also affects the final performance of the product. Therefore, if the iron, zinc and manganese contained in the battery are directly used as Precursors, and then by adding different precursors to adjust the ratio between the elements to prepare ferrite, it will make it more difficult to prepare ferrite with different compositions

Method used

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Examples

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Effect test

Embodiment 1

[0028] Attached below figure 1 And attached figure 2 An example of the present invention is described in detail, the used waste zinc-manganese battery (iron shell battery accounts for about 35%) is collected from the market, and the composition of the prepared ferrite is (MnO) 0.26 (ZnO) 0.23 (Fe 2 o 3 ) 0.1 .

[0029] The roasting furnace used for roasting the washed magnetic separation residue is self-made, the roasting temperature is 850°C, and the roasting time is 1h.

[0030] When using the iron shell separated by magnetic separation to prepare ferric sulfate, the reaction temperature condition is room temperature, and the H 2 SO 4 The concentration is 4mol / L, and the iron and sulfuric acid molar ratio is 1:1.5 for dissolution, and the final iron leaching rate can reach more than 93%. Obtained FeSO 4 Ni in solution 2+ The content is only Fe 2+ 2.5 / 10,000, the nickel impurity content meets the requirements, and no further impurity removal treatment is required....

Embodiment 2

[0036] Others are the same as Example 1, and the difference is that in step (1), the temperature of roasting through the magnetic separation residue washed with water is 800°C, the time is 5h, and the concentration of sulfuric acid that dissolves each species is 0.5mol / L, so The number of moles of sulfuric acid required is twice the number of moles of dissolved species. In the step (2), the precipitating agent is ammonia water, and the amount of the precipitating agent added is twice the total molar number of the three metal salt ions. The gas used to maintain the inert atmosphere in step (3) is nitrogen, the pre-calcination temperature is 700°C, and the pre-fire time is 3h; the high-temperature calcination temperature is 1050°C, and the calcination time is 2h. The specific saturation magnetization of the obtained sample was 67 emu / g.

Embodiment 3

[0038] Others are the same as Example 1, and the difference is that in step (1), the temperature of roasting the magnetic separation residue after washing is 950° C., the time is 0.5h, and the concentration of sulfuric acid that dissolves each species is 4mol / L, so The number of moles of sulfuric acid required is 1.1 times the number of moles of dissolved species. The precipitating agent in step (2) is ammonium oxalate, the amount of the precipitating agent added is 1.1 times of the total moles of the three metal salt ions, the temperature of the reaction solution is 40°C, and the reaction time is 0.5h. The gas used to maintain the inert atmosphere in step (3) is argon, the pre-firing temperature is 850°C, the pre-firing time is 1h, and the sintering temperature is 950°C for 3h. The specific saturation magnetization of the obtained sample is 58emu / g.

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Abstract

The method includes following steps: (1) crashing zinc-manganese cells, solving coarsely separated iron-zinc-manganese so as to obtain solution of reaction predecessor: ferrous sulfate, zinc sulfate and manganese sulfate; (2) preparing predecessor of ferrite by reaction between mixed predecessors according to proportion and ammonium oxalate; (3) baking predecessor of ferrite in high temperature so as to obtain product of ferrite. The method carries out innoxiousness treatment and changes matter in cells to resources. Features are simple, economical and practical.

Description

(1) Technical field [0001] The invention relates to a method for preparing soft magnetic ferrite products by using waste zinc-manganese batteries as raw materials, which belongs to the recycling technology of harmful solid waste. (2) Background technology [0002] Batteries have been widely used in many fields of modern society, and the total output of zinc-manganese batteries (including zinc-manganese dry batteries and alkaline manganese batteries) in China has reached more than 20 billion per year. Recycling the waste batteries produced after these failures can not only realize the recycling of mercury, zinc, copper, manganese and other substances contained in the batteries, but also solve the possible pollution problems caused by waste batteries to the environment. [0003] Now, people have developed a variety of recycling methods for waste zinc-manganese batteries based on pyrometallurgical or hydrometallurgical processes. Among them, the pyrometa...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C01G49/00C04B35/26C04B35/622H01F1/34H01F41/02H01M6/52
CPCY02E60/12Y02W30/84
Inventor 南俊民韩东梅崔明何广平左晓希
Owner SOUTH CHINA NORMAL UNIVERSITY
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