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Method for treating molybdenum-containing substance

A processing method and material technology, applied in the direction of reducing greenhouse gases, climate sustainability, reactor/accelerator external conversion, etc., can solve problems such as single types

Active Publication Date: 2020-10-16
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the single type of treatment methods for existing molybdenum-containing substances, and provide a treatment method for molybdenum-containing substances

Method used

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  • Method for treating molybdenum-containing substance
  • Method for treating molybdenum-containing substance

Examples

Experimental program
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Embodiment 1

[0065] Embodiment 1: the recovery of molybdenum in the molten salt system of the compound containing molybdenum

[0066] (1) KF-ZrF containing 3gMo 4 (wherein, KF and ZrF 4 The molar ratio is 58:42) a total of 100g, placed in the reactor, cover the reactor lid, replace the atmosphere in the reactor with pure argon.

[0067] (2) Heating the reactor to increase the temperature from room temperature to 200° C., and then keep it warm for 2 hours; when the heat preservation is over, replace the atmosphere in the reactor with pure argon. Continue to heat the reactor to make the temperature reach 600°C, keep it warm for 3 hours until the molten salt is completely melted, and pass the mixed gas of nitrogen trifluoride and argon (NF 3 The volume fraction is 50%) and the flow rate is 0.2 L / min. Fourier transform infrared spectrometer is used to detect the gas at the outlet of the reactor. At the same time, the gas pipeline is heated to 100°C, and the MoF is recovered by using a two-s...

Embodiment 2

[0071] Embodiment 2: the recovery of molybdenum in molybdenum trioxide

[0072] (1) 50g MoO 3 Place in the reactor, cover the reactor lid, and replace the atmosphere in the reactor with pure argon.

[0073] (2) Heating the reactor to raise the temperature from room temperature to 250° C., and then keeping it warm for 3 hours; at the end of the keeping, the atmosphere in the reactor was replaced with pure argon. Continue to heat the reactor to make the temperature reach 500°C; keep warm for 2h, and pass the mixed gas of nitrogen trifluoride and argon into the reactor through the mass flow meter (NF 3 The volume fraction is 5%), the flow rate is 1L / min, and the gas at the reactor outlet is detected by a Fourier transform infrared spectrometer. At the same time, the gas pipelines are heated to 100°C; MoF is recovered by using a two-stage adsorber with sodium fluoride as the adsorbent 6 product, the temperature of the adsorber is 100°C.

[0074] (3) MoF in the reactor outlet g...

Embodiment 3

[0077] Embodiment 3: the recovery of molybdenum in the molten salt system of the compound containing molybdenum

[0078] (1) will contain 20g MoF 3 NaF-ZrF 4 (among them, NaF and ZrF 4 The molar ratio is 59.5:40.5) a total of 1000g, placed in the reactor, cover the reactor lid, replace the atmosphere in the reactor with pure argon.

[0079] (2) Heating the reactor to raise the temperature from room temperature to 250° C., and then keeping it warm for 3 hours; at the end of the keeping, the atmosphere in the reactor was replaced with pure argon. Continue to heat the reactor to make the temperature reach 750°C; keep it warm for 24 hours until the molten salt is completely melted, and pass a mixed gas of nitrogen trifluoride and argon (NF 3 The volume fraction is 10%), the flow rate is 2L / min, and the gas at the reactor outlet is detected by a Fourier transform infrared spectrometer. At the same time, the gas pipelines are all heated to 100°C; two-stage condensation is used t...

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Abstract

The invention discloses a method for treating a molybdenum-containing substance. The treatment method comprises the following steps: reacting a molybdenum-containing substance with nitrogen trifluoride at a temperature of 460-1000 DEG C to obtain MoF6, wherein the molybdenum-containing substance is (1) a molybdenum-containing compound; (2) elemental molybdenum and a molybdenum-containing compound;or (3) a substance A and a substance B. The substance A is elemental molybdenum and / or a molybdenum-containing compound; and the substance B is a nuclear fission product and / or molten salt. By meansof the treatment method, the reaction rate of molybdenum-containing substance can reach 90%-100%, and the recovery rate can reach 93%-97%. The treatment method is simple in process, short in flow andfew in solid-liquid wastes.

Description

technical field [0001] The invention belongs to the technical fields of nuclear energy industry technology and dry metallurgy, and in particular relates to a treatment method for molybdenum-containing substances. Background technique [0002] 99 Mo's decay daughter nuclides 99m The nuclear and chemical properties of Tc are ideal, and it is currently the most widely used medical radioisotope in the world. Currently, 99 Mo is the most important medical isotope produced by reactors and is in huge global demand. 99 The preparation method of Mo mainly includes pure natural molybdenum or enriched molybdenum by using reactor thermal neutron irradiation spectrum. 98 MoO 3 Target production 99 Mo; use of reactors to irradiate highly enriched uranium or enrich it 235 U target, through 235 U(n,f) 99 Mo reaction production 99 Mo; produced by accelerator irradiation of molybdenum or uranium targets 99 Mo or direct production 99m Tc. Overall, reactors producing fission 99 Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21G1/04
CPCG21G1/04Y02W30/50
Inventor 孙理鑫牛永生胡聪伟窦强李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI