Method for removing aluminum from rare earth solution by benzoate precipitation method

A rare earth solution and benzoate technology, applied in the fields of chemical industry, rare earth hydrometallurgy, and chemistry, can solve the problems of large consumption of oxalic acid, high environmental risks, high price of oxalic acid, etc., and achieve full utilization of resources and process operability. The effect of strengthening and eliminating environmental risks

Inactive Publication Date: 2015-07-22
葛新芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the rare earth products produced by this process can reach Al 2 o 3 Less than 50PPM, this process has a large consumption of oxalic acid, 1 ton of rare earth oxide consumes 1.35 to 1.5 tons of oxalic acid, and the price of oxalic acid is expensive. Only the cost of raw material consumption is currently as high as 1.0 to 15,000 yuan per ton of

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  • Method for removing aluminum from rare earth solution by benzoate precipitation method

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Embodiment 1

[0030] The embodiment of the present invention 1 benzoate precipitation method from rare earth solution aluminum removal method comprises the following steps:

[0031] (1) Raw material preparation:

[0032] Rare earth solution: praseodymium and neodymium chloride solution produced by extraction and separation: the rare earth content is Pr 6 o 11 +Nd 2 o 3 200g / l, PH4, 20m 3 .

[0033] Precipitating agent: industrial grade sodium benzoate, according to 130% of the theoretical reaction volume, prepare 265kg.

[0034] (2) Aluminum removal by precipitation:

[0035] Under stirring in the rare earth solution, add 265 kg of sodium benzoate, continue to stir for 30 minutes to make the reaction fully, let stand for 1 to 2 hours, separate and filter to obtain aluminum benzoate slag and praseodymium neodymium chloride filtrate with trace amounts of aluminum.

[0036] The obtained praseodymium-neodymium chloride filtrate of embodiment 1 is processed and reclaimed benzoic acid: the...

Embodiment 2

[0039] The embodiment of the present invention 2 benzoate precipitation method from the rare earth solution aluminum removal method comprises the following steps:

[0040] (1) Raw material preparation:

[0041] The rare earth solution is the yttrium chloride solution produced by extraction and separation: the rare earth content Y 2 o 3 180g / l, Al 2 o 3 2g / l, PH4, 10m 3 .

[0042] Precipitant: Prepare 180 kg of benzoic acid according to 120% of the theoretical reaction volume, dissolve 180 kg of benzoic acid with 6% ammonia water to pH 7-8, and wait for complete dissolution to obtain ammonium benzoate solution.

[0043] (2) Aluminum removal by precipitation:

[0044] Under stirring in the yttrium chloride solution, add the ammonium benzoate solution prepared in step (1), stir for 30 minutes to make the reaction fully, stand for 2 hours, separate and filter to obtain aluminum benzoate slag and yttrium chloride rare earth filtrate.

[0045] (3) Recovery of benzoic acid

[0...

Embodiment 3

[0051] The embodiment of the present invention 3 benzoate precipitation method from the rare earth solution aluminum removal method comprises the following steps:

[0052] (1) Raw material preparation:

[0053] The rare earth solution is a neodymium chloride solution produced by extraction and separation: the rare earth content Nd 2 o 3 200g / l, Al 2 o 3 2g / l, PH4, 10m 3 .

[0054] Precipitant: Prepare 180kg of benzoic acid according to 120% of the theoretical reaction volume

[0055] (2) Aluminum removal by precipitation:

[0056] Under stirring in the yttrium chloride solution, slowly add the benzoic acid in step (1), and at the same time add a small amount of ammonia water to adjust the pH to 4.5, continue to stir for 30 minutes to make the reaction fully, stand for 2 hours, separate and filter to obtain aluminum benzoate slag and chlorine Neodymium Rare Earth Filtrate.

[0057] (3) Recovery of benzoic acid

[0058] Add a small amount of hydrochloric acid to the rar...

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Abstract

The invention relates to a method for removing aluminum from a rare earth solution by a benzoate precipitation method. The method comprises the following steps: (1) preparing the raw materials: an aluminum-containing rare earth solution of which the pH is not less than 4 and a REO (rare earth oxide) is 30-300g/L, and a precipitating agent which is one or more of potassium benzoate, sodium benzoate, ammonium benzoate or benzoic acid; and (2) precipitating to remove the aluminum: adding a fixed quantity of the precipitating agent into the aluminum-containing rare earth solution to produce an aluminum benzoate precipitate, and filtering and separating to get rare earth filtrate and aluminum benzoate slag, wherein the using quantity of the precipitating agent is 100-150% of the theoretical reaction amount, and the ratio of Al2O3 in the rare earth filtrate to the REO in percentage by weight is 10-50PPM. The method has the advantages of very low production cost, simple production process, strong process operability, effects of reducing environmental pollution and eliminating environmental protection risk and excellent product quality; and the ratio of the Al2O3 to the REO in percentage by weight can be 10-50PPM.

Description

technical field [0001] The invention relates to the removal of aluminum (Al) in rare earth solution 3+ ) industrialized production methods for the purification of rare earths, especially medium and heavy rare earths such as praseodymium, neodymium, yttrium, and dysprosium, which belong to the fields of rare earth hydrometallurgy, chemical industry, and chemistry. Background technique [0002] Rare earth is known as the treasure trove of modern industrial new materials, especially in the application of high-tech methods, such as fluorescence, permanent magnetic materials, special glass, precision ceramics, superconducting materials, etc. Praseodymium and neodymium are the key and main components of permanent magnetic materials. Component. Aluminum is a harmful impurity in rare earth products, which must be removed during the production process. High-performance rare earth materials have strict requirements on the content of aluminum. The market price of rare earth products ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B59/00
CPCY02P10/20
Inventor 葛新芳
Owner 葛新芳
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