CN-119504063-B - Treatment process based on evaporation mother liquor generated in waste battery recovery process

Abstract

The invention provides a treatment process based on evaporation mother liquor generated in a waste battery recovery process, which comprises the following steps of carrying out pyrolysis treatment on the evaporation mother liquor to obtain a mixed material, carrying out vibration screening treatment on the mixed material to remove organic carbonized ash in the mixed material, carrying out dissolution and value adjustment treatment on the mixed material after vibration screening to obtain a mixed solution, carrying out freezing crystallization treatment on the mixed solution to obtain sodium sulfate salt and frozen liquid, carrying out evaporation concentration treatment on the frozen liquid to obtain sodium chloride salt and mixed salt solution, and carrying out drying treatment on the mixed salt solution to obtain mixed salt. The treatment process can effectively remove organic matters in the evaporation mother liquor, furthest recover salt resources in the evaporation mother liquor, and simultaneously realize sodium salt classification recovery.

Inventors

• JIN DONGHAO
• RUAN DINGSHAN
• LIANG FEIYU
• CHEN RUOKUI
• LI CHANGDONG

Assignees

• 湖南邦普循环科技有限公司
• 广东邦普循环科技有限公司

Dates

Publication Date

20260505

Application Date

20241115

Claims (6)

1. 1. The treatment process based on the evaporation mother liquor generated in the recovery process of the waste batteries is characterized by comprising the following steps of: extracting the evaporation mother liquor to recover residual lithium ions in the evaporation mother liquor; carrying out carbonization treatment on the evaporation mother liquor to obtain a solid salt mixture; carrying out vibration screening treatment on the mixed material to remove organic carbonized ash in the mixed material; Carrying out dissolution value adjustment treatment on the mixed material subjected to vibration screening treatment to obtain a mixed solution subjected to dissolution value adjustment treatment, wherein the method comprises the following steps of: Stirring and dissolving the mixed material after vibration screening treatment to obtain a mixed solution after stirring and dissolving treatment, adding sulfuric acid into the mixed solution after stirring and dissolving treatment to adjust the pH value to an acidic condition, and then adding sodium hydroxide solution to adjust the pH value of the mixed solution to a neutral condition; Filtering the mixed solution with the pH value adjusted to be neutral to remove residual organic carbonized ash in the mixed solution, and then carrying out adsorption treatment on the mixed solution by adopting oil removal resin to remove residual organic matters in the mixed solution; then carrying out freezing crystallization treatment on the mixed solution to obtain sodium sulfate salt and frozen solution; Evaporating and concentrating the frozen liquid to obtain sodium chloride salt and mixed salt solution; And drying the mixed salt solution to obtain mixed salt.
2. 2. The process for treating a mother liquor based on evaporation generated in a recovery process of waste batteries according to claim 1, wherein the step of subjecting the mixed solution to a freeze crystallization treatment comprises: cooling and separating the mixed solution to obtain sodium sulfate crystal slurry and the frozen liquid respectively; Performing first filter pressing and drying treatment on the sodium sulfate crystal slurry to obtain frozen filtrate and sodium sulfate salt respectively; and conveying the frozen liquid and the frozen filtrate to an evaporation concentration treatment step.
3. 3. The process for treating an evaporation mother liquor generated during a recovery process of waste batteries according to claim 1, wherein the step of performing an evaporation concentration treatment on the frozen liquid comprises: evaporating the frozen liquid to obtain an evaporated liquid; thickening and separating the evaporated liquid to obtain sodium chloride crystal slurry and the mixed salt solution respectively; performing second filter pressing and drying treatment on the sodium chloride crystal slurry to obtain sodium chloride and evaporation filtrate respectively; and conveying the mixed salt solution and the evaporation filtrate to a drying treatment step.
4. 4. The process for treating an evaporation mother liquor generated during a recovery process of waste batteries according to claim 3, wherein the step of evaporating and concentrating the frozen liquid before the step of evaporating the frozen liquid further comprises: detecting whether the sodium chloride concentration of the frozen liquid is larger than or equal to a preset sodium chloride concentration value, if so, evaporating and concentrating the frozen liquid; Otherwise, recycling the frozen liquid to the dissolution value adjusting treatment step.
5. 5. The process according to claim 3, wherein after the step of evaporating the frozen liquid and before the step of thickening and separating the evaporated liquid, the process further comprises: and detecting whether the mass ratio of sodium chloride in the frozen liquid is larger than or equal to a preset mass percentage value, and if so, stopping evaporation treatment.
6. 6. The treatment process based on the evaporation mother liquor generated in the recovery process of the waste batteries according to claim 1, wherein the solid-liquid mass ratio of the mixed solution after the dissolution and value adjustment treatment is 0.55:1-0.6:1.

Description

Treatment process based on evaporation mother liquor generated in waste battery recovery process Technical Field The disclosure relates to the technical field of waste battery recovery, in particular to a treatment process based on evaporation mother liquor generated in a waste battery recovery process. Background In the process of battery recovery technology, waste batteries are pretreated to obtain battery powder, and the battery powder enters a wet comprehensive recovery system. The recovery flow of the wet comprehensive recovery system is that the primary battery powder is leached by acid to obtain complex leaching solution, then the metal impurities are removed by sections to obtain valuable metal solution, the valuable metal solution is further subjected to solvent extraction deep purification and enrichment procedures to recover valuable metals, and then the extracted mother liquor is evaporated and concentrated to reduce the volume of the mother liquor, so that the concentration of the impurity salt in the mother liquor is increased, the impurity salt is recovered conveniently, but the recovery mode inevitably mixes the organic extractant into the evaporated mother liquor. For example, the related art battery recovery process adopts activated carbon to remove organic matters in the mother liquor, and the organic solvent still remains in the mother liquor due to the limited adsorption effect of the activated carbon, and meanwhile, the mother liquor contains a large amount of sodium salt, so that the mother liquor is not suitable for direct discharge, if the mother liquor is directly evaporated to dryness, a large amount of energy is consumed, and the evaporated impurity salt contains an extractant, so that the impurity salt needs to be scrapped, and the salt resource is wasted. Therefore, how to effectively remove the organic matters in the evaporation mother liquor and simultaneously recover the salt resource to the maximum extent is a major problem which needs to be solved at present. Disclosure of Invention The purpose of the present disclosure is to overcome the shortcomings in the prior art, and provide a treatment process of evaporating mother liquor based on waste battery recovery process, which can effectively remove organic matters in evaporating mother liquor and simultaneously recover salt resources to the greatest extent. The aim of the disclosure is achieved by the following technical scheme: A treatment process based on evaporation mother liquor generated in the recovery process of waste batteries comprises the following steps: Carrying out pyrolysis treatment on the evaporation mother liquor to obtain a mixed material; carrying out vibration screening treatment on the mixed material to remove organic carbonized ash in the mixed material; Carrying out dissolution and value adjustment treatment on the mixed materials after vibration screening to obtain a mixed solution; Performing freezing crystallization treatment on the mixed solution to obtain sodium sulfate salt and frozen solution; Evaporating and concentrating the frozen liquid to obtain sodium chloride salt and mixed salt solution; And drying the mixed salt solution to obtain mixed salt. In one embodiment, before the step of subjecting the vaporized mother liquor to pyrolysis, the treatment process further comprises: And extracting the evaporation mother liquor to recover residual lithium ions in the evaporation mother liquor. In one embodiment, the step of pyrolytically treating the vaporized mother liquor comprises: pre-carbonizing the evaporation mother liquor to obtain a solid salt mixture; and carbonizing the solid salt mixture to obtain the mixed material. In one embodiment, the operation of performing dissolution modification on the mixture after vibration screening comprises: stirring and dissolving the mixed material after vibration screening to obtain the mixed solution; and (3) carrying out pH adjustment treatment on the mixed solution. In one embodiment, after the step of dissolving and adjusting the value of the mixed material after vibration screening and before the step of freezing and crystallizing the mixed solution, the treatment process further comprises: And filtering and adsorbing the mixed solution to remove residual organic matters in the mixed solution. In one embodiment, the step of subjecting the mixed solution after the filtration adsorption treatment to the freeze crystallization treatment includes: Cooling and separating the mixed solution after filtering and adsorbing treatment to obtain sodium sulfate crystal slurry and the frozen solution respectively; performing first filter pressing and drying treatment on the sodium sulfate crystal slurry to obtain the frozen filtrate and the sodium sulfate salt respectively; and conveying the frozen liquid and the frozen filtrate to an evaporation concentration treatment step. In one embodiment, the step of evaporating and concentrating the frozen liquid compris