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Method for measuring molecular ratio of acid KF-NaF-AlF3 electrolyte system

A kf-naf-alf3, measurement method technology, applied in the direction of electrochemical variables of materials, can solve problems such as large errors, obstacles to industrial application of electrolyte systems, inability to accurately control electrolyte components, etc., to achieve accurate and rapid measurement, short measurement time, Easy-to-operate effects

Inactive Publication Date: 2012-06-20
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, except for the component analysis method with large errors, there are no other methods at home and abroad that can determine KF-NaF-AlF 3 Molecular ratio of the electrolyte system, if this problem is not solved, KF-NaF-AlF will not be able to be accurately controlled in the process of aluminum electrolysis 3 The composition of the electrolyte, which will affect the KF-NaF-AlF 3 Industrial application of electrolyte systems poses major hurdles

Method used

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  • Method for measuring molecular ratio of acid KF-NaF-AlF3 electrolyte system
  • Method for measuring molecular ratio of acid KF-NaF-AlF3 electrolyte system
  • Method for measuring molecular ratio of acid KF-NaF-AlF3 electrolyte system

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Embodiment 1

[0030] Establish a conductivity-NaF standard solution concentration standard curve, the concentration of NaF standard solution is 0.75, 1, 1.25, 1.7, 1.75, 2, 2.25g / L. Weigh 4g of the dried electrolyte sample, add 2g of NaF, grind it in an agate mortar for at least 5min, then sinter in a muffle furnace at 680°C for 30min, take it out and cool it, grind it and weigh it, and then transfer it all into a 250mL beaker. Add 200 mL of deionized water, stir on a magnetic stirrer, and measure the conductivity of the solution. The molecular ratio can be obtained by bringing the content of NaF and other components in the electrolyte into (3) to calculate.

Embodiment 2

[0032] Establish a conductivity-NaF standard solution concentration standard curve, the concentration of NaF standard solution is 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.25g / L. Weigh 2 g of the dried electrolyte sample, add 1.6 g of NaF, grind it in an agate mortar for at least 5 minutes, then sinter it in a muffle furnace at 600 ° C for 50 minutes, take it out and cool it, grind it and weigh it, and then transfer it all into a 250 mL beaker , add 100 mL of deionized water, stir on a magnetic stirrer, and measure the conductivity of the solution. The molecular ratio can be obtained by bringing the content of NaF and other components in the electrolyte into (3) to calculate.

Embodiment 3

[0034] Establish a conductivity-NaF standard solution concentration standard curve, the concentration of NaF standard solution is 1.0, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.25g / L. Weigh 2 g of the dried electrolyte sample, add 1.3 g of NaF, grind it in an agate mortar for at least 5 min, then sinter in a muffle furnace at 680 ° C for 20 min, take it out and cool it, grind it and weigh it, and then transfer it all into a 250 mL beaker , add 100 mL of deionized water, stir on a magnetic stirrer, and measure the conductivity of the solution. The molecular ratio can be obtained by bringing the content of NaF and other components in the electrolyte into (3) to calculate.

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Abstract

The invention relates to a method for rapidly measuring the molecular ratio of an acid KF-NaF-AlF3 electrolyte system, which is characterized in that the measuring process comprises the following steps of: firstly, preparing NaF standard solution, measuring the conductivity of the standard solution, drawing a graph by using the conductivity as the horizontal ordinate and using the concentration of the corresponding NaF standard solution as the vertical coordinate, and carrying out linear fitting to obtain a standard curve equation; then weighing 2 to 4 grams of a dried electrolyte sample, adding 1 to 2 grams of NaF, at least grinding for 5 minutes in an agate mortar, sintering for 15 to 50 minutes in a muffle furnace at a temperature of 600 to 700 DEG C, taking out the obtained product, cooling, grinding fine and weighing, then transferring all the obtained product into a beaker, adding 100 to 200 mL of deionized water, stirring on a magnetic stirrer and measuring the conductivity of the solution; and measuring the content of NaF or KF or other components in the electrolyte and then calculating the molecular ratio. The method disclosed by the invention is rapid, simple and convenient. The measurement error of a measurement result is less than plus and minus 2 percent. The method has good reproducibility. The molecular ratio of the KF-NaF-AlF3 electrolyte system can be accurately and rapidly measured.

Description

technical field [0001] The invention relates to an acidic KF-NaF-AlF 3 Method for determination of molecular ratio in electrolyte system. Background technique [0002] The current industrial aluminum electrolysis uses NaF-AlF 3 Electrolyte system, the molecular ratio in aluminum electrolysis production in my country is defined as the ratio of the number of molecules of sodium fluoride to aluminum fluoride in the electrolyte (that is, the ratio of molar content), as shown in the following formula: [0003] CR = [NaF] / [AlF 3 ] (1) [0004] In the formula, CR is the molecular ratio of the electrolyte, [NaF], [AlF 3 ] is the NaF and AlF in the electrolyte 3 molar content. The molecular ratio of the electrolyte is one of the most important parameters of the electrolyte, which determines many physical and chemical properties of the electrolyte, and affects the current efficiency and the power consumption of the aluminum electrolysis process. Beca...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 颜恒维杨建红李旺兴陈莎子包生重刘丹
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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