Comprehensive recovery method for nickel-hydrogen waste battery

Abstract

The invention discloses a comprehensive recovery method for a nickel-hydrogen waste battery. The method comprises the following steps of: crushing the nickel-hydrogen waste battery and sieving the crushed battery by magnetic separation; preparing leaching solution which contains sulfuric acid and oxidant; throwing undersize powder into the leaching solution, increasing the temperature to 50 to 100 DEG C and leaching the mixture for 1 to 3 hours; performing solid-liquid separation, adjusting the pH value of filtrate to be 2 to 5 and adding water soluble sulfate to precipitate rare earth elements therein; and performing the solid-liquid separation and adding an extraction agent into the filtrate to remove impurities to obtain nickel and cobalt-containing sulfate solution. The comprehensive recovery method for the nickel-hydrogen waste battery can effectively recover various valuable metal elements in various nickel-hydrogen batteries. The extracted and purified nickel and cobalt-containing sulfate solution can be directly applied to the production of positive material spherical nickel hydroxide of the nickel-hydrogen battery. The recovery method has the advantages of low energy consumption in the recovery process, short route and good recovery benefit.

Description

technical field

[0001] The invention relates to a recycling method for waste batteries, in particular to a comprehensive recycling method for nickel-hydrogen waste batteries. Background technique

[0002] Batteries are widely used in daily life, and nickel metal hydride batteries are one of them, and the consumption is also very large.

[0003] Ni-MH batteries contain a large amount of nickel and a considerable amount of cobalt and rare earth elements, and their shells are generally steel shells. Nickel and its compounds are toxic and are environmental carcinogens.

[0004] At the same time, nickel is also a rare, widely used, and highly valuable non-ferrous metal; cobalt is a metal with few resources and is expensive; rare earth elements are also widely used and valuable. Therefore, whether it is from the perspective of environmental protection or from the perspective of economic interests, it is of great significance to recycle waste nickel-metal hydride batteries. [0...

Examples

Embodiment 1

[0043] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0044] 2) Prepare leachate, the concentration of sulfuric acid in the leachate is 1mol / L, the concentration of hydrogen peroxide is 10%;

[0045] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 6L, heat up to 50°C, and leaching for 3 hours;

[0046] 4) Solid-liquid separation, adjust the pH value of the filtrate to 2, the temperature is 50°C, add 1.5 times the theoretical amount of sodium sulfate required for precipitation of rare earth elements, and precipitate the rare earth elements therein;

[0047] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0048] The recovery rate of nickel was 99.4%, that of cobalt was 99.9%, and that of rare earth elements was 97.9%.

Embodiment 2

[0050] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0051] 2) prepare leachate, the concentration of sulfuric acid in the leachate is 5mol / L, the concentration of hydrogen peroxide is 5%;

[0052] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 1 L, heat up to 100°C, and leaching for 1 hour;

[0053] 4) Solid-liquid separation, adjust the pH value of the filtrate to 2, and the temperature is 90°C, add sodium sulfate 3 times the theoretical amount required for precipitation of rare earth elements, and precipitate the rare earth elements therein;

[0054] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0055] The recovery rate of nickel was 99.2%, that of cobalt was 99.8%, and that of rare earth elements was 98.6%.

Embodiment 3

[0057] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0058] 2) prepare leachate, the concentration of sulfuric acid in the leachate is 3mol / L, the concentration of hydrogen peroxide is 8%;

[0059] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 3 L, heat up to 70°C, and leaching for 1.5 hours;

[0060] 4) Solid-liquid separation, adjust the pH value of the filtrate to 3, the temperature is 65 ° C, add sodium sulfate twice the theoretical amount required for precipitation of rare earth elements, and precipitate the rare earth elements;

[0061] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0062]The recovery rate of nickel was 99.7%, that of cobalt was 99.6%, and that of rare earth elements was 98.2%.

technical field

[0001] The invention relates to a recycling method for waste batteries, in particular to a comprehensive recycling method for nickel-hydrogen waste batteries. Background technique

[0002] Batteries are widely used in daily life, and nickel metal hydride batteries are one of them, and the consumption is also very large.

[0003] Ni-MH batteries contain a large amount of nickel and a considerable amount of cobalt and rare earth elements, and their shells are generally steel shells. Nickel and its compounds are toxic and are environmental carcinogens.

[0004] At the same time, nickel is also a rare, widely used, and highly valuable non-ferrous metal; cobalt is a metal with few resources and is expensive; rare earth elements are also widely used and valuable. Therefore, whether it is from the perspective of environmental protection or from the perspective of economic interests, it is of great significance to recycle waste nickel-metal hydride batteries. [0...

Examples

Embodiment 1

[0043] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0044] 2) Prepare leachate, the concentration of sulfuric acid in the leachate is 1mol / L, the concentration of hydrogen peroxide is 10%;

[0045] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 6L, heat up to 50°C, and leaching for 3 hours;

[0046] 4) Solid-liquid separation, adjust the pH value of the filtrate to 2, the temperature is 50°C, add 1.5 times the theoretical amount of sodium sulfate required for precipitation of rare earth elements, and precipitate the rare earth elements therein;

[0047] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0048] The recovery rate of nickel was 99.4%, that of cobalt was 99.9%, and that of rare earth elements was 97.9%.

Embodiment 2

[0050] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0051] 2) prepare leachate, the concentration of sulfuric acid in the leachate is 5mol / L, the concentration of hydrogen peroxide is 5%;

[0052] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 1 L, heat up to 100°C, and leaching for 1 hour;

[0053] 4) Solid-liquid separation, adjust the pH value of the filtrate to 2, and the temperature is 90°C, add sodium sulfate 3 times the theoretical amount required for precipitation of rare earth elements, and precipitate the rare earth elements therein;

[0054] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0055] The recovery rate of nickel was 99.2%, that of cobalt was 99.8%, and that of rare earth elements was 98.6%.

Embodiment 3

[0057] 1) Broken the waste Ni-MH batteries, sieved by magnetic separation, and separated the steel case from the rest of the waste Ni-MH batteries;

[0058] 2) prepare leachate, the concentration of sulfuric acid in the leachate is 3mol / L, the concentration of hydrogen peroxide is 8%;

[0059] 3) Put the powder under the sieve into the leaching solution, powder: leaching solution = 1 kg: 3 L, heat up to 70°C, and leaching for 1.5 hours;

[0060] 4) Solid-liquid separation, adjust the pH value of the filtrate to 3, the temperature is 65 ° C, add sodium sulfate twice the theoretical amount required for precipitation of rare earth elements, and precipitate the rare earth elements;

[0061] 5) Solid-liquid separation, adding extractant P204 to the filtrate to remove impurities to obtain a sulfate solution containing nickel and cobalt.

[0062]The recovery rate of nickel was 99.7%, that of cobalt was 99.6%, and that of rare earth elements was 98.2%.

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