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Analysis method for neodymium content in neodymium chloride hydrate

An analysis method and hydrate technology, applied in the field of rare earths, can solve the problems of cumbersome determination steps and large errors in manual titration, and achieve the effects of small errors, small environmental pollution, and few interference factors

Inactive Publication Date: 2017-07-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The analysis of neodymium content in neodymium chloride hydrate is now mostly carried out by the EDTA titration method in "GB-T 14635-2008 Chemical Analysis Methods of Rare Earth Metals and Their Compounds - Determination of Total Rare Earth". Chemical reagents, and manual titration errors are large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] To determine the content of neodymium in neodymium chloride hydrate, the specific steps are as follows:

[0017] (1) Weigh 10.3350mg sample of neodymium chloride hydrate and put it in a thermogravimetric analyzer for testing. The temperature is increased from 50℃ to 800℃, the temperature rise is 10℃ / min, the nitrogen flow rate is 50ml, and the remaining weight after the test is completed is 7.0391mg;

[0018] (2) The content of neodymium in neodymium chloride hydrate is:

[0019] 7.0391×73.71% / 10.3350=50.20%

[0020] The content of neodymium determined by the EDTA titration method in "GB-T 14635-2008 Chemical Analysis Methods of Rare Earth Metals and Their Compounds: Determination of Total Rare Earth Content" is 50.55%, which is 0.35% deviation from the test result of the present invention, which is different from the national standard test result Basically match.

Embodiment 2

[0022] To determine the content of neodymium in neodymium chloride hydrate, the specific steps are as follows:

[0023] (1) Weigh 10.0800mg sample of neodymium chloride hydrate and put it in a thermogravimetric analyzer for testing. The temperature is raised from 50℃ to 1000℃, the temperature rise is 10℃ / min, the nitrogen flow rate is 50ml, and the remaining weight after the test is completed is 7.7910mg;

[0024] (2) The content of neodymium in neodymium chloride hydrate is:

[0025] 7.7910×73.71% / 10.0800=56.97%

[0026] The content of neodymium determined by EDTA titration method in "GB-T 14635-2008 Chemical Analysis Method of Rare Earth Metals and Their Compounds: Determination of Total Rare Earth Content" is 57.54%, which has a deviation of 0.57% from the test result of the present invention, which is different from the national standard test result Basically match.

Embodiment 3

[0028] To determine the content of neodymium in neodymium chloride hydrate, the specific steps are as follows:

[0029] (1) Weigh 10.6410 mg of neodymium chloride hydrate sample and put it in a thermogravimetric analyzer for testing. The temperature is increased from 50℃ to 800℃, the temperature rise is 20℃ / min, the nitrogen flow rate is 50ml, and the remaining weight after the test is completed is 7.6600mg;

[0030] (2) The content of neodymium in neodymium chloride hydrate is:

[0031] 7.6600×73.71% / 10.6410=53.06%

[0032] The content of neodymium determined by the EDTA titration method in "GB-T 14635-2008 Chemical Analysis Method for Rare Earth Metals and Their Compounds: Determination of Total Rare Earth Content" is 53.74%, which is a deviation of 0.74% from the test result of the present invention, which is different from the national standard test result Basically match.

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Abstract

The invention relates to an analysis method for the neodymium content in neodymium chloride hydrate. The analysis method comprises: (1) carrying out thermogravimetric analysis on a neodymium chloride hydrate sample, wherein X g of a neodymium chloride hydrate sample is weighed, thermogravimetric analysis test is performed, a reaction is performed on the neodymium chloride hydrate to generate neodymium hypochlorite, and after the test is completed, the weight of the remaining material is Y g; and (2) calculating neodymium content in the neodymium chloride hydrate, wherein the neodymium content is Y*73.71% / X. According to the present invention, by using the instrument analysis method, the interference factor is less, and the error is small; and during the testing process, the reagent is not used, such that no waste liquid is produced, and the environmental pollution is low.

Description

Technical field [0001] The invention belongs to the field of rare earths, and specifically relates to an analysis method of neodymium content in neodymium chloride hydrate. Background technique [0002] The analysis of neodymium content in neodymium chloride hydrate is now mostly determined by the EDTA titration method in "GB-T 14635-2008 Chemical Analysis Methods of Rare Earth Metals and Their Compounds-Determination of Total Rare Earth Content". This method is cumbersome and requires a variety of procedures. Chemical reagents, and manual titration errors are large. [0003] Su Mian once studied the dehydration reaction mechanism of neodymium chloride hydrate in "The dehydration process of rare earth element chloride hydrate and the mechanism of hydrolysis reaction". Summary of the invention [0004] The purpose of the present invention is to provide an instrumental analysis method with few interference factors and small errors; no reagent is used in the test process, no waste liq...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 孙福权周爱文周豪孙伟韩明哲徐刚孙枫陈加平赵宇华伦松杨红玲闫蓉肖爱玲张玺
Owner PETROCHINA CO LTD
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