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Method for detecting radioactive separation degree in lanthanum chloride and its application

A technology of separation degree and lanthanum chloride, which is applied in the field of detection of radioactive separation degree in lanthanum chloride, can solve the problems such as long detection period of radioactive removal degree, achieve simple and convenient experiment and analysis process, strong practicability, and shorten detection time Effect

Active Publication Date: 2020-11-13
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for detecting the degree of radioactive separation in lanthanum chloride, aiming at improving the problem that the detection cycle of the degree of radioactive removal in the existing lanthanum chloride solution is too long

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  • Method for detecting radioactive separation degree in lanthanum chloride and its application

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Embodiment 1

[0041] The method for detecting the degree of radioactive separation in lanthanum chloride provided by the present embodiment is specifically:

[0042] The lanthanum chloride mixed solution with a volume of 1L adopts the P507-kerosene extractant whose concentration is 1.5mol / L and saponification rate of 45% with a volume of 7L. After 10 stages of extraction and separation of radioactive elements, the loaded lanthanum extractant is obtained. The hydrochloric acid solution that volume is 1.05L carries out back extraction as stripping agent to load lanthanum extractant, and Ca in hydrochloric acid solution 2+ Concentration is 20mg / L, HCl concentration is 4.5mol / L, obtains lanthanum feed liquid, and La in lanthanum feed liquid 3+ The concentration is 1.4mol / L, Ca 2+ The total removal rate of calcium from the initial lanthanum chloride mixed solution to the lanthanum feed solution is about 42%. According to the removal rate of calcium, it can be known that the radioactive removal...

Embodiment 2

[0044] The method for detecting the degree of radioactive separation in lanthanum chloride provided by the present embodiment is specifically:

[0045] The lanthanum chloride mixed solution with a volume of 1L adopts the P507-kerosene extractant with a volume of 20L of P507 concentration of 1.2mol / L and a saponification rate of 20%. After 18 stages of extraction and separation of radioactive elements, the loaded lanthanum extractant is obtained. A volume of 1.1L hydrochloric acid solution is used as a stripping agent to back-extract the loaded lanthanum extractant, and Ca in the hydrochloric acid solution 2+ Concentration is 20mg / L, HCl concentration is 4.5mol / L, obtains lanthanum feed liquid, and La in lanthanum feed liquid 3+ The concentration is 1.35mol / L, Ca 2+ It is 171mg / L. The total removal rate of calcium from the initial lanthanum chloride mixed solution to the lanthanum feed solution is calculated to be about 90%. It can be seen that the radioactivity removal degr...

Embodiment 3

[0047] The method for detecting the degree of radioactive separation in lanthanum chloride provided by the present embodiment is specifically:

[0048] The mixed solution of lanthanum chloride with a volume of 1L adopts the P507-kerosene extractant whose concentration is 1.8mol / L and saponification rate of 36% to obtain the first solution after 27 extraction and separation of the radioactive elements with a volume of 6L. The hydrochloric acid solution of 1L is carried out back extraction to the first solution as stripping agent, and Ca in the hydrochloric acid solution 2+ Concentration is 20mg / L, HCl concentration is 4.5mol / L, obtains lanthanum feed liquid, and La in lanthanum feed liquid 3+ The concentration is 1.48mol / L, Ca 2+ It is 58mg / L. The calculated total removal rate of calcium from the initial lanthanum chloride mixed solution to the lanthanum feed solution is about 97%. According to the removal rate of calcium, it can be seen that the degree of radioactive remova...

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Abstract

The invention relates to the technical field of rare earth processing. The embodiment of the invention provides a method for detecting the radioactive separation degree in lanthanum chloride. The method comprises the steps that a lanthanum chloride mixed solution containing calcium ions and actinium ions is extracted and separated by a saponified P507-kerosene extraction agent to remove the calcium ions and the actinium ions from the lanthanum chloride mixed solution, and the removal rate of the calcium ions is measured to evaluate the radioactive removal degree of the lanthanum chloride mixedsolution. According to the method, the removal rate of the calcium ions can be calculated after the calcium ions and the actinium ions are removed, and the radioactive removal degree is reflected bythe removal rate of the calcium ions; compared with the prior art that the radioactive removal rate can be accurately detected only when placement is conducted for 140 days after removal, the method has the advantages that long-term placement and waiting are not needed, and the detection efficiency is greatly improved. When the detection method is applied to rare earth processing and production, since the detection efficiency for the radioactive removal rate is greatly improved, the efficiency of rare earth production and processing can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of rare earth processing, in particular to a method for detecting the degree of radioactive separation in lanthanum chloride and its application. Background technique [0002] Rare earth minerals all contain a certain amount of radioactive substances, and the content of radioactive elements in different rare earth minerals is quite different. In the past, people's research on rare earth radioactivity mainly focused on monazite, bastnaesite and their mixed ores. However, ionic rare earth ores in my country also contain some radioactive elements. Because ionic rare earth ores contain some radioactive elements Ac227, although 227Ac is a β emitter, it produces a series of short-lived α daughters, which are extremely toxic natural radionuclides, and their relative risk is far higher than 226Ra. 227Ac is located below La in the periodic table of elements, and its chemical properties are similar to those of La ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/02G01T1/167
CPCG01T1/02G01T1/167
Inventor 刘志强张魁芳曹洪杨
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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