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Back extraction solution prepared by extraction separation of washing organic matter of saponification wastewater by recycling rare earth and solution washing method

A rare earth extraction separation and saponification wastewater technology, which is applied in the direction of improving process efficiency, can solve the problems of increasing wastewater discharge, large new water volume, and large equipment investment, so as to reduce organic consumption, reduce resource waste, and increase rare earth yield. Effect

Inactive Publication Date: 2012-07-18
BAOTOU JINGRUI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Rare earth extraction and separation using P 507 ,P 204 , naphthenic acid, etc. as the extraction agent, the saponification agent uses ammonia water, ammonium bicarbonate, sodium hydroxide, sodium carbonate, calcium oxide, magnesium oxide, and the saponified extraction agent enters the rare earth saponification section of the extraction and separation process to produce ammonium chloride , sodium chloride, calcium chloride, magnesium chloride wastewater, the salt content of these wastewaters is low, and a large amount of water needs to be evaporated to crystallize the recovered salt, which requires high energy consumption and large investment in equipment
[0003] The rare earth extraction and separation process uses fresh water to wash the organic matter. After washing the organic matter, the washing residue contains 0.5-3mol / L acidic aqueous solution. Since the amount of the washing residue is relatively large, except for dissolving mixed rare earth carbonate, the remaining part is discharged as waste water; Fresh water is used to prepare stripping liquid and washing liquid separately. The process consumes a large amount of fresh water and increases the amount of waste water discharge, resulting in low concentration of ammonium chloride or sodium chloride in waste water. Recover ammonium chloride or sodium chloride from waste water high energy consumption

Method used

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  • Back extraction solution prepared by extraction separation of washing organic matter of saponification wastewater by recycling rare earth and solution washing method
  • Back extraction solution prepared by extraction separation of washing organic matter of saponification wastewater by recycling rare earth and solution washing method
  • Back extraction solution prepared by extraction separation of washing organic matter of saponification wastewater by recycling rare earth and solution washing method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The raw material is the raffinate after the separation of neodymium and samarium from the mixed rare earth chloride solution, the rare earth concentration is 1.5mol / L, pH=2, and its composition includes La 2 o 3 Content is 28.61%, CeO 2 The content is 50.46%, Pr 6 o 11 The content is 5.31%, Nd 2 o 3 The content is 15.63%; the separation scale is 12250 tons / year (calculated by rare earth oxide);

[0019] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0020] La 3+ and Ce 3+ For refractory rare earth elements, Pr 3+ and Nd 3+ Easy to extract rare earth elements;

[0021] Ammonia is used as the saponification agent for the extraction and separation of cerium and praseodymium and the saponification agent for the extraction and separation of praseodymium and neodymium;

[0022] The saponification wastewater produced by the extraction and separation of praseodymium and neodymium is 174M 3 / day, the concentration of ammonium ch...

Embodiment 2

[0026] The raw material is the back-extraction solution after the mixed rare earth chloride solution is separated by gadolinium and terbium, the rare earth concentration is 1.2mol / L, pH=2, and its composition includes Tb by weight ratio 4 o 7 The content is 6.72%, Dy 2 o 3 The content is 22.52%, (Ho-Lu, Y) 2 o 3 The content is 70.76%; the separation scale is 464 tons / year (calculated by rare earth oxide);

[0027] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0028] Tb 3+ and Dy 3+ Refractory rare earth elements, (Ho-Lu, Y) 3+ Easy to extract rare earth elements;

[0029] Sodium hydroxide is used as the saponification agent for the extraction and separation of dysprosium and holmium and the saponification agent for the extraction and separation of erbium and thulium;

[0030] Erbium and thulium extraction and separation to produce saponification wastewater is 9.25M 3 / day, the sodium chloride concentration in the waste water is...

Embodiment 3

[0034] The raw material is a mixed rare earth chloride solution, the rare earth concentration is 1.5mol / L, pH=2, and its composition is by weight ratio La 2 o 3 -Nd 2 o 3 Content is 98%, Sm 2 o 3 -Lu 2 o 3 and Y 2 o 3 The content is 2%; the separation scale is 12,500 tons / year (calculated as rare earth oxides)

[0035] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0036] La 3+ -Nd 3+ For refractory rare earth elements, Sm 3+ -Lu 3+ and Y 3+ Easy to extract rare earth elements;

[0037] Ammonium bicarbonate solution is used as the saponification agent for the extraction and separation of neodymium and samarium, and ammonia water is used as the saponification agent for the extraction and separation of praseodymium and neodymium;

[0038] The saponification wastewater produced by the extraction and separation of praseodymium and neodymium is 174M 3 / day, the concentration of ammonium chloride in the waste water is 2.6mol / L; ...

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Abstract

The invention relates to a back extraction solution prepared by extraction separation of a washing organic matter of saponification wastewater by recycling rare earth and a solution washing method, belonging to the field of rare earth wet method hydrometallurgy. According to the requirement on purity of difficultly-extracted and easily-extracted elements by a rare earth extraction separation process and different ammonium chloride or sodium chloride media in a water phase in the process, the saponification wastewater is recycled and used as a washing organic matter water solution for preparing a back extraction solution and a washing solution, thus the wastewater discharge is lowered, the consumption of fresh water is reduced, the concentration of ammonium chloride or sodium chloride in the wastewater is improved, the energy consumption of concentrating and crystallizing as well as recycling the ammonium chloride or sodium chloride is decreased, the rare earth yield is improved and the organic matter loss is lowered.

Description

technical field [0001] The invention relates to a method for reusing rare earth to extract and separate saponification waste water for washing organic matter and preparing stripping liquid and lotion, and belongs to the field of rare earth hydrometallurgy. Background technique [0002] Rare earth extraction and separation using P 507 ,P 204 , naphthenic acid, etc. as the extraction agent, the saponification agent uses ammonia water, ammonium bicarbonate, sodium hydroxide, sodium carbonate, calcium oxide, magnesium oxide, and the saponified extraction agent enters the rare earth saponification section of the extraction and separation process to produce ammonium chloride , sodium chloride, calcium chloride, magnesium chloride wastewater, the salt content of these wastewaters is low, and a large amount of water needs to be evaporated to crystallize the recovered salt, which requires high energy consumption and large investment in equipment. [0003] The rare earth extraction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 郝先库张瑞祥刘海旺王士智斯琴毕力格许宗泽马显东陈敏璇吴英王兴
Owner BAOTOU JINGRUI NEW MATERIAL
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