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Method for separating tombarthite from phosphorus ore

A technology of rare earth and phosphate rock, applied in the direction of improving process efficiency, etc., can solve problems such as economic difficulties and complex recovery process of rare earth, and achieve the effect of simple process, high rare earth grade and low slag rate

Active Publication Date: 2011-10-19
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the production of phosphoric acid by the dihydrate method: the rare earth-containing phosphate rock and the back acid are mixed in the first room of the reaction tank. Since the back acid temperature is above 50°C, more than 50% of the rare earth in the phosphate rock enters the solution. After sulfuric acid is added to the second, third and fourth tanks, the rare earths will enter the phosphogypsum due to the adsorption of phosphogypsum. Due to the large amount of phosphogypsum slag and the grade of rare earths is lower than that of the original ore, the process of recovering rare earths from phosphogypsum is complicated and relatively economical. big difficulty

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  • Method for separating tombarthite from phosphorus ore
  • Method for separating tombarthite from phosphorus ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 100g containing rare earth 0.14 wt % rare earth phosphorus concentrate and 1000 mL Contains P 2 o 5 20 wt % dilute phosphoric acid solution was mixed according to the solid-to-liquid ratio of 1:10, stirred and reacted at 15°C for 1 hour, filtered to obtain the filtrate and leached residue, weighed and analyzed the leached residue after drying, the slag rate was 22%, and the rare earth content in the slag was 0.59% 93% of the rare earths are enriched in the slag, and the enrichment factor is 4.2 times. The rare earths in the slag are leached with sulfuric acid to obtain a sulfuric acid rare earth solution. Rare earths are recovered.

Embodiment 2

[0028] Take 100g containing rare earth 0.14 wt % rare earth phosphorus concentrate and 1000 mL Contains P 2 o 5 20 wt % dilute phosphoric acid solution was mixed at a solid-to-liquid ratio of 1:10, stirred and reacted at 45°C for 1 hour, filtered to obtain the filtrate and leached residue, weighed and analyzed the leached residue after drying, the slag rate was 21%, and the rare earth content in the slag was 0.57% , 85% of rare earths are enriched in the slag, and the enrichment factor is 4.1 times. The rare earths in the slag are leached with sulfuric acid to obtain a sulfuric acid rare earth solution. One or more methods in extraction, ion exchange adsorption, precipitation, and crystallization Rare earths are recovered.

Embodiment 3

[0030] Take 100g containing rare earth 0.14 wt % rare earth phosphorus concentrate and 1000 mL Contains P 2 o 5 20 wt % dilute phosphoric acid solution was mixed at a solid-to-liquid ratio of 1:10, stirred and reacted at 16°C for 4 hours, filtered to obtain the filtrate and leached residue, weighed and analyzed after the leached residue was dried, the slag rate was 18%, and the rare earth content in the slag was 0.73% 94% of the rare earths are enriched in the slag, and the enrichment factor is 5.2 times. The rare earths in the slag are leached with sulfuric acid to obtain a sulfuric acid rare earth solution. Rare earths are recovered.

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Abstract

The invention discloses a method for separating tombarthite from phosphorus ore and relates to the method for separating the tombarthite from the phosphorus ore containing the tombarthite. The method is characterized in that the process steps are as follows: (1) mixing phosphate concentrate containing the tombarthite with a phosphoric acid solution for performing reaction; (2) filtering for getting a reaction solution and slag containing the tombarthite; (3) adding acid into the slag containing the tombarthite for leaching for getting leachate containing the tombarthite, and further recycling the tombarthite through one or more of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and (4) performing decalcification on the reaction solution obtained by filtration and then returning to the step (1). By adopting the method, the precipitation rate of the tombarthite in the phosphorus ore is greater than 85%, the slag rate is small, the grade of the tombarthite in the slag is high, the leaching rate of the tombarthite in the slag is high, no additives are added during the process and the product quality of the phosphoric acid is not affected; and furthermore, the phosphoric acid used during the process can be self-produced and can also be circulating dilute phosphoric acid, dilute phosphoric acid and the like generated during the production process of the phosphoric acid, thereby being tightly linked with the production process of the phosphoric acid through the sulfuric acid method.

Description

technical field [0001] The invention discloses a method for separating rare earth from phosphate rock, relating to a method for separating rare earth from phosphate rock containing rare earth. Background technique [0002] The total proven reserves of rare earth resources in the world are 45 million tons (calculated as oxides), which are relatively concentrated in China, the United States, India, Australia, the former Soviet Union and other countries. A large amount of rare earth resources are associated with non-metallic phosphate rocks. The total reserves of phosphate rocks in the world are about 100 billion tons. According to the average rare earth content of 0.05%, the total reserves can reach 50 million tons. It is of great significance to recover rare earths from phosphate rocks. [0003] The content of rare earth in phosphate rock is low, and it has no economic advantages to be used only as a raw material for rare earth extraction. It needs to be combined with the tra...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B59/00
CPCC22B59/00Y02P10/20
Inventor 蒋开喜冯林永蒋训雄汪胜东范艳青蒋伟刘巍张登高王海北张邦胜林江顺刘三平赵磊王玉芳张磊邹小平黄胜冯爱玲蒋应平冯亚平
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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