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Method for chemically separating bastnaesite and urdite from mixed rare earth concentrate

A mixed rare earth and bastnaesite technology, which is applied in the direction of improving process efficiency and the like, can solve the problems of unresearched smelting of mixed rare earth ore with high monazite, and achieve the effects of low cost, industrialization and simple method.

Inactive Publication Date: 2011-05-11
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sulfuric acid smelting process and caustic soda smelting process of high bastnaesite-containing mixed rare earth ores (Baotou ore) have been applied in production practice, the smelting of high monazite mixed rare earth ores has not been studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1Kg of Baotou mixed rare earth concentrate, in which the ratio of bastnaesite to monazite is 3:1, the rare earth content is 50.6%, and 800 mL of water is added to make slurry. Take 395g of anhydrous aluminum chloride, add it into 370mL of water, make it dissolve, and make a solution of 8mol / L. Take 950 mL of 10 mol / L HCl. AlCl 3 solution and HCl solution were added to the slurry of rare earth concentrate, stirred at 75°C for 60 minutes, filtered and washed with water for 3 times, and dried to obtain a solution containing rare earth after bastnaesite decomposed and monazite-rich filter residue. After testing the filtrate 2420mL, the rare earth concentration is 180.2g / L, the leaching rate of bastnaesite is 96.5%; the filter residue weighs 345g, and the rare earth content is 33.9%.

Embodiment 2

[0027] Take 1Kg of Baotou mixed rare earth concentrate, in which the ratio of bastnaesite to monazite is 3:1, the rare earth content is 50.6%, and 500 mL of water is added to make slurry. Take 880g of boric acid, add it into 2840mL of water, heat to make it dissolve, and make a 5mol / L solution. Take 1190mL of 6mol / L HCl. Add boric acid solution and HCl solution to the slurry of rare earth concentrate, stir at 60°C for 180 min, filter and wash the filter residue with water for 3 times, and dry the filter residue to obtain the solution containing rare earth after bastnaesite decomposes and rich Filter residue of monazite. The detected filtrate was 4850mL, the concentration of rare earth was 76.6g / L, and the leaching rate of bastnaesite was 93.6%; the weight of filter residue was 364g, and the content of rare earth was 37.5%.

Embodiment 3

[0029] Take 1Kg of Baotou mixed rare earth concentrate, in which the ratio of bastnaesite to monazite is 3:1, the rare earth content is 50.6%, and 500 mL of water is added to make slurry. Take 685g of aluminum nitrate, add it into 460mL of water, make it dissolve, and make a 7mol / L solution. Take 8mol / L HNO 3 1200mL. Aluminum nitrate solution and HNO 3 Add the solution to the rare earth concentrate slurry, stir at 50°C for 150 minutes, filter and wash the filter residue with water three times, and dry the filter residue to obtain a rare earth-containing solution after bastnaesite decomposition and a monazite-rich filter residue respectively. After testing the filtrate 2600mL, the rare earth concentration was 143.8g / L, the leaching rate of bastnaesite was 94.2%; the filter residue weighed 368g, and the rare earth content was 34.2%.

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Abstract

The invention relates to a method for chemically separating bastnaesite and urdite from a mixed rare earth concentrate, belonging to the technical field of rare earth hydrometallurgy. In the invention, the mixed rare earth concentrate (bastnaesite / urdite mixed rare earth ores) from Baotou is separated into a single bastnaesite concentrate and a urdite concentrate, and fluorions can be converted into a complex by using a complexing method, so that the complex can enter a solution to destroy the bastnaesite. The method provided by the invention comprises the following steps: adding bastnaesite / urdite mixed ores into water, pulping, and adding a complexing agent solution and an inorganic acid solution to decompose the bastnaesite, so that the dissolved bastnaesite enters the solution, thereby separating the bastnaesite from the urdite. The method provided by the invention is simple, has the advantages of low production cost and low pollution, develops a new way for further extracting rare earth elements from bastnaesite and urdite, and can be used as a method for extracting rare earth elements from single bastnaesite or other bastnaesite / urdite mixed rare earth ores.

Description

Technical field: [0001] The invention relates to a chemical separation method of bastnaesite and monazite ore of mixed rare earth concentrate, belonging to the technical field of rare earth hydrometallurgy. Background technique: [0002] The Baiyan Obo Mine in Baotou is the largest rare earth deposit in the world. The rare earth minerals contained in the ore are mainly bastnaesite and monazite. The ratio of these two rare earth minerals is generally between 9:1 and 6:4. In each rare earth beneficiation process, the ratio of bastnaesite and monazite into the concentrate is basically similar, so the obtained products are all mixed rare earth concentrates of bastnaesite and monazite, and the rare earth ratio of the two mineral forms No major changes. [0003] Because Baotou rare earth concentrate is a mixed ore of bastnaesite and monazite, and the chemical composition of bastnaesite and monazite is different, bastnaesite is a rare earth fluorocarbonate, and monazite is a rare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B1/00C22B59/00
CPCY02P10/20
Inventor 李梅柳召刚胡艳宏张晓伟张永强刘佳
Owner INNER MONGOLIA UNIV OF SCI & TECH
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