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Method for recovering cerium and fluorine from bastnaesite leachate

A technology of bastnaesite and leaching solution, which is applied in the field of recycling, can solve the problems of high process cost, high cost, loss of organic phase, etc., and achieve the effect of reducing cost, reducing dosage and high added value

Active Publication Date: 2020-08-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems in this process are: (1) The precipitation of cerium fluoride during the operation of the extraction section will easily lead to the blockage of the mixing and settling tank. In addition, the loss of the organic phase caused by the precipitation of cerium fluoride is also more significant. (2) The extraction agent Cyanex923 used in the co-recovery process of cerium and fluorine is an imported extraction agent with high cost, and due to the high content of cerium, the amount of Cyanex923 is large, which makes the process cost high

Method used

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  • Method for recovering cerium and fluorine from bastnaesite leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using the sulfuric acid leaching solution of bastnaesite as the raw material solution to recover cerium and fluorine, the raw material solution composition: 30g / L CeO 2 , CeO 2 / REO is 40% by weight, and REO is the total content of rare earth oxides. There is also 6g / L of F. The acidity of feed liquid is 2.0mol / L H 2 SO 4 . The diluent is n-heptane and n-octane, the volume ratio of the two is 1:1.

[0028] (1) Add the boric acid of 5g / L in feed liquid;

[0029] (2) The extractant is HL (monobasic phosphoric acid P204 (bis(2-ethylhexyl) phosphoric acid), diluted with a diluent so that the volume fraction of the extractant is 10%, and it is used to extract the feed liquid of step (1) , the flow ratio of organic phase: feed liquid: lotion is 2.5:1:0.75, and the lotion is 1mol / L of H 2 SO 4 . The number of extraction stages is 7, the number of washing stages is 3, and the raffinate containing cerium-containing organic phase and containing F and other trivalent rare...

Embodiment 2

[0034] The process of recovering cerium and fluorine from the sulfuric acid leaching solution of bastnaesite and monazite mixed ore, the composition of the raw material solution: 10g / L CeO 2 , CeO 2 / REO is 20% by weight, and REO is the total content of rare earth oxides. There is also 1g / L of F. The acidity of feed liquid is 1.5mol / L H 2 SO 4 . The diluent is n-heptane and n-octane, the volume ratio of the two is 1:1.

[0035] (1) Add the boric acid of 1g / L in feed liquid;

[0036] (2) The extractant is HL phosphonic acid P507 (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester)), diluted with diluent to extractant volume fraction is 5%, organic phase: feed liquid: washing liquid The flow ratio is 1:1:0.5, and the wash solution is 0.1mol / L H 2 SO 4 . The number of extraction stages is 4, the number of washing stages is 1, and the raffinate containing cerium-containing organic phase and F and other trivalent rare earths is obtained;

[0037] (3) The stripping soluti...

Embodiment 3

[0040] The process of recovering cerium and fluorine with the sulfuric acid leaching solution of bastnaesite, the composition of the raw material solution: 60g / L CeO 2 , CeO 2 / REO is 80% by weight, and REO is the total content of rare earth oxides. There is also 12g / L of F. The acidity of feed liquid is 2.5mol / LH 2 SO 4 . The diluent is n-heptane and n-octane, the volume ratio of the two is 1:1.

[0041] (1) Add the boric acid of 10g / L in feed liquid;

[0042] (2) extractant is HL (monobasic phosphoric acid P204 (two (2-ethylhexyl) phosphoric acid), is diluted to extractant volume fraction with diluent and is 15%. Organic phase: material liquid: the flow ratio of lotion is 4:1:1, the washing solution is 2mol / L H 2 SO 4 . The number of extraction stages is 10, and the number of washing stages is 5, so that the organic phase containing cerium and the raffinate containing F and other trivalent rare earths are obtained

[0043] (3) The stripping solution for the cerium-...

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Abstract

The invention relates to a method for recovering cerium and fluorine from bastnaesite leachate, and the method comprises the following steps: taking sulfuric acid leachate of bastnaesite or bastnaesite and monazite mixed ore as a raw material solution, and adding 0.02-10g / L of boric acid into the raw material solution; extracting cerium in the raw material solution by using an extracting agent, and then carrying out reverse extraction, precipitation, separation and roasting to obtain CeO2; and then taking trialkyl phosphine oxide as an extracting agent to extract F in the extraction raffinate,and carrying out reverse extraction by using a KOH solution to obtain KBF4. According to the method disclosed by the invention, the cerium and the fluorine are separately recovered, and the F is prepared into the KBF4 in strip liquor, so that the problems that a mixing clarification tank is easily blocked in the operation process of a cerium fluoride precipitate in an extraction section, and an organic phase is lost due to the fact that the cerium fluoride precipitate carries the organic phase are avoided. According to the method, the Ce is recovered by using the extraction agents P507 and P204, so that the consumption of Cyanex923 is reduced, and the cost is reduced. Compared with a CeF3 product, the KBF4 product has more definite market requirements and higher additional value, and themethod better meets the market requirements and enterprise requirements.

Description

technical field [0001] The invention relates to a recovery method, in particular to a method for recovery of cerium and fluorine from bastnaesite leaching solution. Background technique [0002] The rare earth resources in Baotou in my country are mainly the mixed ore of bastnaesite and monazite, and their relative content is 9:1-1:1. Among them, bastnaesite is cerium fluorocarbonate mineral, theoretical chemical composition: REO is 74.77%, CO 2 is 20.17%, F is 8.73%, and rare earth oxides are mainly cerium group rare earth elements, so bastnaesite is an important mineral for extracting cerium and lanthanum. Many people in the prior art have studied the extraction and separation of cerium and other rare earth elements from Baotou rare earth concentrates. The method is to oxidize trivalent cerium in cerium-containing minerals or other cerium-containing mixtures to tetravalent cerium, and then add acid solution for leaching, and then The tetravalent cerium in the acid leachi...

Claims

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Application Information

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IPC IPC(8): C01F17/235C01F17/17C01B35/06
CPCC01F17/235C01F17/17C01B35/066C01P2006/80C01P2002/72
Inventor 陈继邹丹邓岳锋李德谦
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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