Method for applying baotite mixed carbonate-rare earth precipitation wastewater in precipitation of europium (II) sulfate

A technology of rare earth carbonate and europium sulfate, applied in the direction of improving process efficiency, etc., can solve the problems of waste of resources, environmental pollution, high production costs, etc., and achieve the effect of increasing the yield of rare earth and reducing waste of resources

Inactive Publication Date: 2012-02-01
BAOTOU JINGRUI NEW MATERIAL
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Problems solved by technology

In terms of application, this mixture can only be used in low-demand industry applications such as agricultural fertilizers and leaching reagents for ion-adsorbed rare earth ores. To obtain relatively pure ammonium sulfate and magnesium sulfate heptahydrate products requires higher production costs. It is difficult for enterprises to bear, so the application in other fields is limited, and there is a backlog of a large number of recovered crystals, such as the discharge of sedimentation wastewater, which will cause waste of resources and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Baotou rare earth concentrate mixed rare earth carbonate precipitation wastewater contains ammonium sulfate 0.28mol / L, magnesium sulfate heptahydrate 0.2mol / L, the volume of the wastewater is concentrated 5 times, and the concentrated solution contains ammonium sulfate 1.4mol / L, seven Magnesium sulfate water 1mol / L, cooled for later use.

[0014] at 3M 3 In the reaction tank, add 2M 3 Samarium-europium-gadolinium-enriched material solution, the rare earth concentration of the material solution is 1mol / L, the acidity of the material solution is pH=4, and the content of europium oxide in the material solution is Eu 2 o 3 / REO is 10%, add 12.32kg of zinc powder, add 166.5 liters of concentrated ammonium sulfate and magnesium sulfate mixed solution, start stirring for 2 hours, clarify for 4 hours, filter, and the obtained filter cake is europium sulfate precipitate, the content of europium oxide Eu 2 o 3 / REO=92.6%, the filtrate is a samarium-gadolinium enrichment solu...

Embodiment 2

[0016] Baotou rare earth concentrate mixed rare earth carbonate precipitation wastewater contains ammonium sulfate 0.28mol / L, magnesium sulfate heptahydrate 0.2mol / L, the volume of the wastewater is concentrated 5 times, and the concentrated solution contains ammonium sulfate 1.4mol / L, seven Magnesium sulfate water 1mol / L, cooled for later use.

[0017] at 3M 3 In the reaction tank, add 2M 3 Samarium-europium-gadolinium-enriched material solution, the rare earth concentration of the material solution is 1.2mol / L, the acidity of the material solution is pH=4, and the content of europium oxide in the material solution is Eu 2 o 3 / REO is 8%, add 11.83kg of zinc powder, add 160 liters of concentrated ammonium sulfate and magnesium sulfate mixed solution, start the stirring reaction for 2 hours, clarify for 4 hours, filter, and the obtained filter cake is europium sulfate precipitate, the content of europium oxide Eu 2 o 3 / REO=92.8%, the filtrate is a samarium-gadolinium enr...

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Abstract

The invention relates to a method for applying baotite mixed carbonate-rare earth precipitation wastewater in precipitation of europium (II) sulfate, belonging to the field of rare earth hydrometallurgy. The method comprises the step of concentrating precipitation wastewater from production of mixed carbonate-rare earth by baking and decomposing rare earth baotite concentrate with concentrated sulfuric acid to obtain a concentrated mixed solution of ammonium sulfate and magnesium sulfate. The obtained concentrated mixed solution is used as a rich europium preparation reagent in europium oxide extraction process from Sm-Eu-Gd enrichment mineral to replace single magnesium sulfate heptahydrate to be used as europium (II) sulfate precipitant, thereby broadening the recycling ranges of precipitation wastewater from production of mixed carbonate-rare earth from rare earth baotite concentrate, lowering the energy consumption in concentration and crystallization of recovered wastewater, saving the production cost, and reducing the resource waste and environmental pollution.

Description

technical field [0001] The invention relates to a method for using mixed rare earth carbonate precipitation wastewater in Baotou mine for europium sulfate precipitation, and belongs to the field of rare earth hydrometallurgy. Background technique [0002] At present, in the process of extracting europium oxide from samarium, europium and gadolinium concentrates, one of the key processes is the preparation of rich europium, which is widely used in industry to reduce trivalent europium to divalent europium ions with zinc powder, and the resulting divalent europium ions Then react with sulfate radical to form stable europium sulfate precipitation to realize the separation of europium and other rare earths. In the process, sulfate radical is added to the reaction system with magnesium sulfate heptahydrate. Magnesium sulfate has been widely used as europium sulfate precipitant. Ammonium sulfate or a mixture of ammonium sulfate and magnesium sulfate has not been widely used as a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B59/00
CPCY02P10/20
Inventor 郝先库张瑞祥刘海旺王士智
Owner BAOTOU JINGRUI NEW MATERIAL
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