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A method for removing aluminum ions in a praseodymium neodymium chloride feed solution

A technology of praseodymium chloride and aluminum ions, which is applied in the field of removing aluminum ions in praseodymium neodymium chloride feed liquid, can solve problems such as high cost and difficulty in solid-liquid separation of precipitation, and achieve high effective utilization rate, good precipitation performance, and convenient solidification The effect of liquid separation

Active Publication Date: 2020-12-15
SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the high cost of removing aluminum ions in the praseodymium and neodymium chloride liquid in the prior art and the generated Al(OH) 3 For the problem of difficult solid-liquid separation in precipitation, the invention provides a method for removing aluminum ions in a praseodymium-neodymium chloride feed liquid, and its purpose is to provide a low-cost method for removing aluminum ions in a praseodymium-neodymium chloride feed liquid, and to make Generated Al(OH) 3 Precipitated particles are small in size and easy to filter and separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] 1. Take the praseodymium and neodymium material liquid after extraction and separation, and the concentration of rare earth in the material liquid is 316.25g / L, Al 2 o 3 / REO=0.26%, dilute the praseodymium and neodymium material liquid concentration with clear water and the rare earth concentration is 85g / L.

[0039] 2. Take 1500ml of the above-mentioned diluted feed solution and put it in a 2000ml beaker, place the beaker on an adjustable temperature electric furnace, and stir it with a precision booster electric stirrer.

[0040] 3. When the temperature of the feed liquid is raised to 40°C, slowly add 1.5mol / L mixed lye to the system at the same time to adjust the pH to 4.0, and then quantitatively add citric acid, sodium citrate, acetic acid and sodium acetate to prepare the pH= 5ml of the buffer solution of 4.5.

[0041] 4. Quantitatively add 25ml of mixed lye to the system, control the reaction temperature at 40°C, and the reaction time is 30min.

[0042] 5. Add ...

example 2

[0047] 1. Take the praseodymium and neodymium material liquid after extraction and separation, and the concentration of rare earth in the material liquid is 306g / L, Al 2 o 3 / REO=0.2%, the rare earth concentration of the praseodymium and neodymium feed solution diluted with clear water is 95g / L.

[0048] 2. Take 1500ml of the above-mentioned diluted feed solution and put it in a 2000ml beaker, place the beaker on an adjustable temperature electric furnace, and stir it with a precision booster electric stirrer.

[0049] 3. When the temperature of the feed liquid is raised to 40°C, slowly add 1.5mol / L mixed lye to the system at the same time to adjust the pH to 4.0, and then quantitatively add citric acid, sodium citrate, acetic acid and sodium acetate to prepare the pH= 4.5 4ml of buffer solution.

[0050] 4. Quantitatively add 15ml of mixed lye to the system, control the reaction temperature at 40°C, and the reaction time is 40min.

[0051] 5. Add 5ml of polyacrylamide solu...

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PUM

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Abstract

The invention belongs to the technical field of rare-earth separation, and particularly relates to a method for removing aluminum ions in a neodymium praseodymium chloride material liquid. Due to diversity of mineral sources, non-rare earth impurities in a mixed rare earth chloride material liquid obtained through chemical leaching are difficult to remove. According to the method, another way is opened, the hydrolytic process of the aluminum ions in the neodymium praseodymium chloride material liquid subjected to extraction separation is explored, and optimal conditions of aluminum ion hydrolysis are found out by adding an additive and used for removing the aluminum ions in the neodymium praseodymium chloride material liquid. It is shown through the experimental result that the depositionrate of the aluminum ions in the neodymium praseodymium chloride material liquid reaches 93% or above, the deposition rate of rear earth is 1.5% or below, the deposition volume rate is small, and solid-liquid separation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of rare earth separation, and in particular relates to a method for removing aluminum ions in a praseodymium and neodymium chloride feed liquid. Background technique [0002] Due to the diversity of rare earth raw ores, the rare earth grades, components and the content of non-rare earth impurities are extremely complex, and the chemical leaching process for different minerals is also very different. Increased difficulty, especially the removal of aluminum ions in the rare earth feed solution. In the rare earth extraction and separation process, the mixed rare earth chloride obtained after extraction, washing and back extraction will form Al 3+ The enrichment, so that the Al in the back-extracted praseodymium neodymium liquid 2 o 3 / REO reaches above 0.2%, high content of Al 3+ The praseodymium neodymium material liquid seriously affects the product quality in the subsequent precipitation process, causing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B59/00
CPCC22B3/44C22B59/00Y02P10/20
Inventor 朱光荣张荣许思玉冯新瑞林伟吴仕伦
Owner SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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