Method for recycling rare earth from waste nickel-hydride battery and conducting transformation
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A nickel-metal hydride battery, waste technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve problems such as difficulty in returning to the rare earth production system, poor solubility of rare earth sulfate, and unfavorable deep processing, etc. Easy to break, easy to recycle, easy to dissolve
Active Publication Date: 2016-12-14
JINCHUAN GROUP LIMITED
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[0003] The technical problem to be solved by the present invention is to provide a method of recovering rare earths from waste nickel-hydrogen batteries and transforming them, so as to solve the problem that the rare earth sulfates in the prior art have poor solubility and high thermal stability, which are not conducive to further deep processing, and are very difficult to obtain. It is difficult to return to the rare earth production system for repeated reuse
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Embodiment 1
[0016] A crushing treatment: Take 95g of waste nickel-metal hydride batteries, in a dry state, cool the waste nickel-hydrogen batteries to 15 degrees Celsius, and then crush the waste nickel-metal hydride batteries with a temperature of 15 degrees Celsius. The temperature of the processed slag is lower than 18 degrees Celsius;
[0017] B acid leaching treatment: Slurry the slag with 1.5mol / L sulfuric acid at a liquid-solid ratio of 10.7:1, add 30% hydrogen peroxide and heat for a period of time (indicating the concentration of sulfuric acid), until the percentage of solid-liquid substances in the mixture No longer changes, when the pH value is 1.5;
[0018] C primary solid-liquid separation: the mixing after the acid leaching treatment carries out the solid-liquid separation treatment to obtain filtrate A and filter residue A, wherein filtrate A is nickel sulfate solution rich in impurities such as rare earth and cobalt, iron, manganese, and filter residue A is useless residue...
Embodiment 2
[0028] A crushing treatment: Take 2000g of waste nickel-metal hydride batteries, in a dry state, cool the waste nickel-hydrogen batteries to 15 degrees Celsius, and then crush the waste nickel-metal hydride batteries with a temperature of 15 degrees Celsius. 18 degrees Celsius;
[0029] B acid leaching treatment: Slurry the slag with 1.5mol / L sulfuric acid at a liquid-solid ratio of 10:1, add 30% hydrogen peroxide and heat for a period of time (indicating the concentration of sulfuric acid), until the percentage of solid-liquid substances in the mixture No longer changes, when the pH value is 2;
[0030] C primary solid-liquid separation: the mixing after the acid leaching treatment carries out the solid-liquid separation treatment to obtain filtrate A and filter residue A, wherein filtrate A is nickel sulfate solution rich in impurities such as rare earth and cobalt, iron, manganese, and filter residue A is useless residue;
[0031] D primary precipitation treatment: Add 200...
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Abstract
The invention discloses a method for recycling rare earth from a waste nickel-hydride battery and conducting transformation. The method comprises seven steps including the first step of crushing treatment, the second step of acid leaching treatment, the third step of primary solid-liquid separation, the fourth step of primary sedimentation treatment, the fifth step of secondary solid-liquid separation, the sixth step of sulfuric acid rare earth double salt transformation treatment and the seventh step of rare earth sedimentation extraction. Compared with rare earth sulfate, carbonic acid rare earth sediment is easy to dissolve, the carbonic acid rare earth sediment can be better conducted to further deep processing and can be well separated from nickel and cobalt in the waste nickel-hydride battery, recycling of the rare earth is facilitated, and other valuable metal can be recycled. The reaction is conducted under the normal pressure, the reaction temperature is low, and therefore energy consumption is low. The waste nickel-hydride battery is crushed under the temperature condition of 15 DEG C, volatilization of harmful substances of the waste nickel-hydride battery can be reduced, and the waste nickel-hydride battery can be easier to crush; and to prevent temperature rise of the waste nickel-hydride battery due to collisions in the crushing process, it is most proper to crush the waste nickel-hydride battery in winter.
Description
technical field [0001] The invention relates to the technical field of recycling valuable metals in waste nickel-hydrogen batteries, in particular to a method for recovering rare earths from waste nickel-hydrogen batteries and transforming them. Background technique [0002] Waste nickel-metal hydride batteries contain a large amount of nickel, cobalt, manganese and rare earth elements, among which the content of rare earth elements is about 12%. Rare earth elements are rare resources in nature and their content is low. At present, they are widely used in electronics, Petrochemical, metallurgy, machinery, energy, light industry, environmental protection, agriculture and other fields. Therefore, being able to recycle it not only has significant economic benefits, but also reduces environmental pollution, saves energy, and reduces energy consumption. In the past, the nickel-hydrogen battery recycling method mainly used the traditional dressing and smelting process to recover ...
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