Technology for preparing metal sodium with molten electrolysis of sodium hydroxide and electrolytic system of technology

A technology of sodium hydroxide and molten electrolysis, applied in the direction of electrolysis components, electrolysis process, cells, etc., can solve the problems of inconvenient installation of purification devices, no gas protection, damage to seals, etc., to ensure integrity and safety, Effect of improving purity and preventing contamination

Pending Publication Date: 2018-12-18
中国东方电气集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1. The internal parts of the device need to be sealed. The more parts need to be sealed, the easier it is to cause seal leakage, and at the same time, it will bring in more pollution from the seals, which cannot provide a favorable and stable environment for the preparation of refined sodium;
[0010] 2. No gas protection and valves are installed, adding metal sodium before electrolysis is very easy to pollute the metal sodium, and at the same time, it is not easy to install in the purification device;
[0011] 3. After the production of refined sodium is completed, there will be a large amount of refined sodium remaining in the device and cannot be discharged, resulting in waste and a large potential safety hazard
A large amount of refined sodium accumulates in the diaphragm tube, which is easy to react with the seal, damage the seal, and destroy the tightness

Method used

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  • Technology for preparing metal sodium with molten electrolysis of sodium hydroxide and electrolytic system of technology
  • Technology for preparing metal sodium with molten electrolysis of sodium hydroxide and electrolytic system of technology
  • Technology for preparing metal sodium with molten electrolysis of sodium hydroxide and electrolytic system of technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] A kind of technique that prepares sodium metal by molten electrolysis of sodium hydroxide, comprises the steps:

[0073] A. By opening the mechanical pump, the refined sodium temporary storage chamber 16, the refined sodium pipe 7, the refined sodium tank 3, the sodium discharge pipe 8 and the refined sodium storage tank 4 form a closed through cavity, and the through cavity is evacuated to a pressure of 10Pa, and then Introduce protective gas through the gas storage tank to a pressure of 5KPa;

[0074] B. After the operation in step A is finished, inject sodium hydroxide powder into the electrolytic cell 2, then heat the electrolytic cell 2 to 260°C at 5°C / min, keep it warm for 4h, and then inject the sodium hydroxide powder in the electrolytic cell 2 , diaphragm ceramic tube 1101 and refined sodium temporary storage chamber 16 are preheated;

[0075] C. Connect the sodium seed tank to the intake pipe 13 at the electrolysis unit 11, heat the sodium seed tank to 180...

Embodiment 2

[0087] A kind of technique that prepares sodium metal by molten electrolysis of sodium hydroxide, comprises the steps:

[0088] A. By opening the mechanical pump, the refined sodium temporary storage chamber 16, the refined sodium pipe 7, the refined sodium tank 3, the sodium discharge pipe 8 and the refined sodium storage tank 4 form a closed through cavity, and the through cavity is evacuated to a pressure of 4Pa, and then Pass the protective gas through the gas storage tank to a pressure of 0.1KPa;

[0089] B. After the operation in step A is completed, inject sodium hydroxide powder into the electrolytic cell 2, then heat the electrolytic cell 2 to 180 °C at 1 °C / min, keep it warm for 2 hours, and then inject the sodium hydroxide powder in the electrolytic cell 2 , diaphragm ceramic tube 1101 and refined sodium temporary storage chamber 16 are preheated;

[0090] C. Connect the sodium seed tank to the intake pipe 13 at the electrolysis unit 11, heat the sodium seed tan...

Embodiment 3

[0102] A kind of technique that prepares sodium metal by molten electrolysis of sodium hydroxide, comprises the steps:

[0103] A. By opening the mechanical pump, the refined sodium temporary storage chamber 16, the refined sodium pipe 7, the refined sodium tank 3, the sodium discharge pipe 8 and the refined sodium storage tank 4 form a closed through cavity, and the through cavity is evacuated to a pressure of 8Pa, and then Introduce protective gas through the gas storage tank to a pressure of 3KPa;

[0104] B. After the operation in step A is finished, inject sodium hydroxide powder into the electrolytic cell 2, then heat the electrolytic cell 2 to 120°C at 3°C / min, keep it warm for 3h, and then inject the sodium hydroxide powder in the electrolytic cell 2 , diaphragm ceramic tube 1101 and refined sodium temporary storage chamber 16 are preheated;

[0105] C. Connect the sodium seed tank to the intake pipe 13 at the electrolysis unit 11, heat the sodium seed tank to 130°...

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Abstract

The invention discloses a technology for preparing metal sodium with molten electrolysis of sodium hydroxide and an electrolytic system of the technology and belongs to the technical field of molten electrolysis technologies and equipment. By adopting the electrolytic system, under regulation and control of protective gas, the pressures of a fine sodium temporary storage cavity, a fine sodium groove and a fine sodium storage tank keep constant and are changed, and then generation and transferring of fine sodium are finished through heating, thermal insulation and current regulation. By adopting the preparation technology, through an electrochemical method, by utilizing the principle of diaphragm ceramic pipe ion permselectivity, impurities are blocked out of a diaphragm, and thus the purity of a metal sodium product is improved; and in addition, the preparation technology is liable to realize quantity production and low in energy consumption and is simple. The electrolytic system is simple in structure, convenient to install, good in sealing performance and convenient and complete in sodium discharge, can prevent pollution of air and pipeline parts and provides a favorable and stable environment to preparation of the fine sodium.

Description

technical field [0001] The invention relates to a preparation process and a molten electrolysis system of sodium metal, in particular to a process and an electrolysis system for preparing sodium metal by molten electrolysis of sodium hydroxide, belonging to the technical field of molten electrolysis process and equipment. Background technique [0002] Sodium is one of the most widely distributed elements on the earth, and its weight accounts for about 2.83% of the total weight of the earth's crust, ranking sixth. Based on the active chemical properties (such as: reducibility), low melting point, and a series of characteristics such as good thermal conductivity, specific heat capacity, and electrical conductivity of metallic sodium, it has a wide range of applications. It can be used to manufacture secondary energy sodium-sulfur batteries, reduce rare metals from rare metal compounds, coolants in turbocharged engines, coolants for sodium-cooled fast neutron nuclear reactors, ...

Claims

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Application Information

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IPC IPC(8): C25C3/02C25C7/06C25C7/00
CPCC25C3/02C25C7/005C25C7/06Y02E60/36
Inventor 袁小武王瑨李愿杰阴宛珊张文军张中伟
Owner 中国东方电气集团有限公司
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