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Method for separating rare-earth element and fluorapatite, calcium chloraphosphate and calcium phosphate

A rare earth element and calcium chlorophosphate technology is applied in the field of monazite and fluorocarbon cerium, which can solve problems such as unfavorable extraction of rare earth element rare earth alloy, and achieve the effects of reducing production cost, waste water discharge, and high dephosphorization rate.

Inactive Publication Date: 2007-03-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and it is difficult to separate calcium fluorophosphate, calcium chlorophosphate and calcium phosphate from rare earth elements in rare earth minerals or decomposed rare earth minerals, which is unfavorable for extracting rare earth elements therefrom Elements and their use in the production of rare earth alloys, a new method for the separation of rare earth elements from calcium fluorophosphate, calcium chlorophosphate and calcium phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Calcium oxide + additives roasted monazite product, its chemical composition is shown in Table 1. The process includes the following steps:

[0022] (1). Dissolution of calcium chlorphosphate and calcium phosphate

[0023] Using this product as a raw material, the process conditions for dissolving calcium chlorophosphate and calcium phosphate with a mixed solution of hydrochloric acid and citric acid are: solid-to-liquid ratio = 1:10; stirring for 1 to 2 hours at room temperature; mixed solution of hydrochloric acid and citric acid The concentration of hydrochloric acid is 0.35mol L -1 ; Citric acid 0.04mol L -1 . After the dissolution is completed, the solid-liquid phases are separated by vacuum suction, centrifugal filtration, and plate-and-frame filter press. The solid phase is rare earth minerals after dephosphorization, and its main chemical composition is: RE x o y ≥78%, Ca 5 Cl(PO 4 ) 3 +Ca 3 (PO 4 ) 2 ≤1%.

[0024] (2). Recovery of calcium phosphate...

Embodiment 2

[0030] Calcium oxide + auxiliary agent roasting monazite and bastnaesite mixed type rare earth mineral product chemical composition is shown in Table 2, the process includes the following steps:

[0031] (1). Dissolution of calcium fluorophosphate and calcium phosphate

[0032] Using this product as a raw material, the process conditions for dissolving calcium fluorophosphate and calcium phosphate with hydrochloric acid and citric acid solution are: solid-liquid ratio=1:14; stirring for 1 to 2 hours at room temperature; the concentration of hydrochloric acid and citric acid solution 0.35mol·L hydrochloric acid -1 ; Citric acid 0.02mol L -1 . After the dissolution is completed, the solid-liquid phases are separated by vacuum suction filtration or centrifugal filtration. The solid phase is rare earth minerals after dephosphorization, and its main chemical composition is: RE x o y ≥63%, Ca 5 F(PO 4 ) 3 +Ca 3 (PO 4 ) 2 ≤1%.

[0033] (2). Recovery of calcium fluorophosp...

Embodiment 3

[0039] The chemical composition of monazite and bastnaesite mixed low rare earth grade minerals containing apatite is shown in Table 3. The process includes the following steps:

[0040] (1). Dissolution of calcium fluorophosphate and calcium phosphate

[0041] Using this product as a raw material, the process conditions for dissolving calcium fluorophosphate with hydrochloric acid and citric acid solution are: solid-liquid ratio=1:5; stirring for 1 to 2 hours under normal temperature; the concentration of hydrochloric acid and citric acid solution is 1.0 mol L -1 ; Citric acid 0.5mol L -1 . After the dissolution is completed, the solid-liquid phases are separated by vacuum suction filtration or centrifugal filtration. The solid phase is rare earth minerals after dephosphorization, and its main chemical composition is: RE x o y ≥33%, Ca 5 F(PO 4 ) 3 +Ca 3 (PO 4 ) 2 ≤1%.

[0042] (2). Recovery of calcium fluorophosphate and calcium phosphate

[0043] The solution i...

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PUM

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Abstract

The process of separating RE elements from calcium fluorophosphate, calcium chlorophosphate and calcium phosphate is to wash mineral with the mixed solution of hydrochloric acid and citric acid to leach out calcium fluorophosphate, calcium chlorophosphate and calcium phosphate while limiting the leaching of RE elements and other matters. The solution containing calcium fluorophosphate, calcium chlorophosphate and calcium phosphate is alkalized to produce precipitate and recover calcium fluorophosphate, calcium chlorophosphate and calcium phosphate product; and the small amount of RE elements are recovered with P204 or P507 extractant. The said process has calcium fluorophosphate, calcium chlorophosphate and calcium phosphate leaching rate not lower than 95 wt%, RE element leaching rate not higher than 10 wt% and total RE element yield not lower than 97 wt%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for extracting rare earth elements from rare earth minerals, in particular to a mixed type rare earth mineral and a phosphorite containing monazite decomposed by calcium oxide and monazite and bastnaesite. A method for separating rare earth elements from calcium fluorophosphate, calcium chlorophosphate and calcium phosphate in a mixed rare earth mineral in which monazite and bastnaesite are symbiotic. Background technique [0002] Monazite and mixed rare earth minerals in which monazite and bastnaesite coexist are important rare earth resources. Because rare earth elements exist in minerals in the form of phosphate or phosphate and fluorocarbonate coexistence, which makes decomposition more difficult. Therefore, the current industrial production method for extracting rare earth elements from such minerals is only high-temperature sulfuric acid. There are two kinds of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/00C22B3/04C22B3/22C22B3/26C22B59/00
CPCY02P10/20
Inventor 吴文远涂赣峰边雪孙树臣高波
Owner NORTHEASTERN UNIV
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