Method for recovering phosphorus and rare earth from rare earth-containing phosphate ore

A technology of rare earth and phosphate rock, which is applied in the direction of chemical instruments and methods, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of low recovery efficiency of phosphorus and rare earth elements, and achieve the purpose of improving the separation efficiency of rare earth, separating rare earth at low cost, reducing the The effect of miscellaneous burden

Active Publication Date: 2017-01-11
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for recovering phosphorus and rare earths from rare earth-containing phospha

Method used

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  • Method for recovering phosphorus and rare earth from rare earth-containing phosphate ore
  • Method for recovering phosphorus and rare earth from rare earth-containing phosphate ore

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Using 1000g of phosphate rock with a rare earth content of 0.05wt% as raw material, use a phosphoric acid solution with a mass concentration of 15% to leach the rare earth phosphate rock, control the liquid-solid ratio of the system at 10:1, react at 10°C for 1 hour, filter Finally, monocalcium phosphate solution containing rare earth and acid leaching residue are obtained.

[0061] Put the rare earth-containing monocalcium phosphate solution at 60°C for aging treatment for 24 hours, so that the rare earth elements are precipitated in the form of rare earth phosphate precipitates, and the monocalcium phosphate solution and 0.71g of rare earth phosphate precipitates are obtained through solid-liquid separation.

[0062] After testing, the leaching rate of impurity Fe in phosphate rock was 3.5%, the leaching rate of impurity Al was 2.5%, and the leaching rate of phosphorus element was 95.3%; the content of rare earth in rare earth phosphate precipitation was 57.1%, and the...

Embodiment 2

[0064] Using 1000g of phosphate rock with a rare earth content of 0.2wt% as raw material, use a phosphoric acid solution with a mass concentration of 20% to leach the rare earth phosphate rock, control the liquid-solid ratio of the system at 6:1, react at 20°C for 6 hours, and filter Finally, monocalcium phosphate solution containing rare earth and acid leaching residue are obtained.

[0065] Put the rare earth-containing monocalcium phosphate solution at 60°C for aging treatment for 1 hour, so that the rare earth element is separated from the monocalcium phosphate solution in the form of rare earth phosphate precipitation, and thus through solid-liquid separation, a monocalcium phosphate solution and 3.30 g Precipitation of rare earth phosphate.

[0066] After testing, the leaching rate of Fe in phosphate rock was 4.1%, that of Al was 3.1%, and that of phosphorus element was 96.8%. The content of rare earth in rare earth phosphate precipitation was 52.1%, and the recovery rat...

Embodiment 3

[0068] Using 1000g of phosphate rock with a rare earth content of 0.2wt% as raw material, use a phosphoric acid solution with a mass concentration of 20% to leach the rare earth phosphate rock, control the liquid-solid ratio of the system at 6:1, react at 20°C for 6 hours, and filter Finally, monocalcium phosphate solution containing rare earth and acid leaching residue are obtained.

[0069] Place the rare earth-containing monocalcium phosphate solution at 80°C for aging treatment for 1 hour, so that the rare earth element is separated from the monocalcium phosphate solution in the form of rare earth phosphate precipitation, and thus through solid-liquid separation, a monocalcium phosphate solution and 3.40 g Precipitation of rare earth phosphate.

[0070] After testing, the leaching rate of Fe in phosphate rock was 4.1%, that of Al was 3.1%, and that of phosphorus element was 96.6%. The content of rare earth in rare earth phosphate precipitation was 53.8%, and the recovery r...

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Abstract

The invention provides a method for recovering phosphorus and rare earth from a rare earth-containing phosphate ore; the method comprises the steps: step S1, leaching the rare earth phosphate ore with a solution containing phosphoric acid, to obtain acid-leached slag and a leached solution containing rare earth ions, Ca<2+> and H2PO<4->; and step S2, carrying out aging treatment of the leached solution to obtain a rare earth phosphate precipitate, and making rare earth separated from Ca<2+> and H2PO<4->, wherein a reaction temperature of the step S2 is higher than a reaction temperature of the step S1. The method adopts the solution containing phosphoric acid for acid leaching of the rare earth phosphate ore at relatively low reaction temperature, phosphorus and rare earth elements are allowed to enter the leached solution, then aging treatment of the leached solution is carried out at relatively high temperature, the rare earth ions are allowed to form the rare earth phosphate precipitate, rare earth and phosphorus are separated and recovered efficiently, the rare earth enrichment factor is high, and further recycling is facilitated.

Description

technical field [0001] The invention relates to the field of rare earth recovery, in particular to a method for recovering phosphorus and rare earth from phosphate rock containing rare earth. Background technique [0002] Rare earth minerals often coexist with barite, calcite, apatite, silicate ore and other minerals in nature. Due to the different mineralization reasons of minerals, the occurrence state and content of rare earth elements in minerals are also different. Among the currently mined rare earth minerals, the grade of rare earth oxides is generally a few percent. In order to meet the needs of rare earth metallurgical production, the rare earth must be separated from other ores by beneficiation before smelting, so that the rare earth minerals can be enriched. The content of rare earth oxides in the rare earth concentrate after beneficiation and enrichment is usually 50% to 70%. [0003] Rare earth minerals mainly include bastnaesite, monazite, xenotime and ion-a...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/06C01B25/32C01B25/18C01F11/46
CPCY02P10/20
Inventor 王良士黄小卫巫圣喜于瀛王春梅崔大立冯宗玉董金诗龙志奇
Owner GRIREM ADVANCED MATERIALS CO LTD
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