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Method for preparing saponifier by directly recycling saponification wastewater produced by extraction and separation of rare earth

A rare earth extraction and separation and saponification wastewater technology, which is applied in the direction of improving process efficiency, etc., can solve the problems of large energy consumption in evaporation and concentration, large wastewater volume, and low salt content, so as to improve the stratification effect, reduce organic consumption, and improve Effect of Rare Earth Yield

Inactive Publication Date: 2011-02-09
BAOTOU JINGRUI NEW MATERIAL
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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 waste water, the salt content in these waste water is relatively low, recovering salt needs to evaporate a large amount of water to crystallize, energy consumption is high, investment is big, (patent: CN200910138821.0) waste water produced by saponification Directly use the evaporation concentration method to increase the concentration of sodium chloride in the wastewater, and then enter the electrolysis section to prepare hydrochloric acid and sodium hydroxide. This method directly consumes a lot of energy by evaporation and concentration. (Patent: CN200610057908.1) The wastewater produced after saponification contains a certain amount of acid , the wastewater needs to be neutralized with alkaline compounds, and then the wastewater is returned to the extraction system. This method requires a large amount of wastewater to be neutralized, and the operation is cumbersome

Method used

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  • Method for preparing saponifier by directly recycling saponification wastewater produced by extraction and separation of rare earth
  • Method for preparing saponifier by directly recycling saponification wastewater produced by extraction and separation of rare earth

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Experimental program
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Effect test

Embodiment 1

[0015] The raw material is the raffinate after the mixed rare earth chloride solution is divided into groups of neodymium and samarium, the rare earth concentration is 1.5mol / L, pH=2, and its composition includes La 2 o 3 and CeO 2 The content is 79%, Pr 6 o 11 and Nd 2 o 3 The content is 21%; the separation scale is 12250 tons / year (according to rare earth oxides);

[0016] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0017] La 3+ and Ce 3+ For refractory rare earth elements, Pr 3+ and Nd 3+ Easy to extract rare earth elements;

[0018] Adopt ammonia water as saponification agent;

[0019] The mixed clarification extraction tank is used for the extraction and separation of cerium and praseodymium. The raffinate is the high-purity material liquid obtained by extraction and separation of lanthanum and cerium. Saponification agent is prepared from the saponified waste water generated in the stage.

[0020] In order to make th...

Embodiment 2

[0022] The raw material is mixed rare earth chloride solution, the rare earth concentration is 1.5mol / L, pH=2, and its composition includes 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 (according to rare earth oxides);

[0023] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0024] La 3+ -Nd 3+ For refractory rare earth elements, Sm 3+ -Lu 3+ and Y 3+ Easy to extract rare earth elements;

[0025] Adopt ammonium bicarbonate solution as saponification agent;

[0026] A mixed clarification extraction tank is used for the extraction and separation of neodymium and samarium. The raffinate is a high-purity feed solution obtained by extraction and separation of cerium and praseodymium. , the product does not require high content of refractory rare earth elements. The saponification wastewater produced by extraction and separation of cerium and praseo...

Embodiment 3

[0029] The raw material is mixed rare earth chloride solution, the rare earth concentration is 1.2mol / L, pH=2, and its composition includes Sm 2 o 3 and Eu 2 o 3 Content is 38%, Gd 2 o 3 The content is 62%; the separation scale is 220 tons / year (according to rare earth oxides);

[0030] The organic phase is P 507 (diluted with kerosene), its concentration is 1.5mol / L;

[0031] SM 3+ and Eu 3+ For refractory rare earth elements, Gd 3+ Easy to extract rare earth elements;

[0032] Adopt sodium hydroxide as saponification agent;

[0033] A mixed clarification extraction tank is used for the extraction and separation of europium and gadolinium. The raffinate is a europium-rich solution, which is used as a feed solution for the separation of europium. The solution contains very low refractory rare earth elements, and gadolinium chloride is the raw material solution for preparing gadolinium carbonate products; the saponification wastewater produced in this section is used...

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Abstract

The invention relates to a method for preparing saponifier by directly recycling saponification wastewater produced by the extraction and separation of rare earth, which belongs to the field of rare earth hydrometallurgy. In the invention, the saponification wastewater produced by the extraction and separation of the rare earth is directly recycled to prepare the saponifier; the saponification wastewater is recycled according to different ammonium chloride or sodium chloride contents of the wastewater and the characteristics of contained trace rare earth elements as well as the requirements for extraction and separation purity of the rare earth; the saponification wastewater is recycled, which reduces the discharge of wastewater, reduces the using amount of pure water, improves the ammonium chloride or sodium chloride contents of the wastewater, reduces the energy consumption on concentrating, crystallizing and recycling ammonium chloride or sodium chloride, improves the rare earth yield, and lowers the organic consumption.

Description

technical field [0001] The invention relates to a method for directly reusing saponification wastewater produced by rare earth extraction and separation to prepare a saponification agent, belonging 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 waste water, the salt content in these waste water is relatively low, recovering salt needs to evaporate a large amount of water to crystallize, energy consumption is high, investment is big, (patent: CN200910138821.0) waste water produced by saponification Directly u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/26
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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