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Analysing method of excess alumina content in aluminium electrolyte

An aluminum electrolyte and analysis method technology, applied in the field of aluminum electrolysis, can solve the problems of unstable analysis results and large errors

Active Publication Date: 2007-02-14
兰州铝业有限公司 +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide an analysis method for excess aluminum fluoride content in aluminum electrolyte with high analysis and measurement accuracy, simple and fast, and low analysis cost, which can overcome the existing sodium fluoride sintered fluoride ion selective electrode method for determining molecular ratio Insufficient analysis results are unstable and errors are large due to incomplete reaction between sodium fluoride and aluminum electrolyte

Method used

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Embodiment Construction

[0029] The analysis method of aluminum electrolyte excess aluminum fluoride provided by the invention, concrete implementation process is as follows:

[0030] 1 Analysis step

[0031] 1.1 Preparation of analytical test solution

[0032] 1.1.1 1ml of NaF standard solution contains 1mgF, that is, the concentration of NaF standard solution Cs=1.000g / L

[0033] Weigh 2.2105g of analytically pure NaF that has been dried at 110°C for 2h, and dilute it with water in a 1000ml volumetric flask for later use

[0034] 1.1.2 Total Ionic Strength Adjuster (TISAB)

[0035] Take 58.0g of NaCl, 57.0ml of glacial acetic acid, and 10.0g of citric acid, mix them with 5mol / L NaOH (about 175ml) to adjust the pH to 5.25, transfer it into a 1000ml volumetric flask, dilute with water and set the volume to the mark for later use;

[0036] 1.2 The sample is dried at 110±5°C for 2 hours and placed in a desiccator, which should pass through a 200-mesh sieve;

[0037] 1.3 Weigh the electrolyte sample ...

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Abstract

A method for analyzing content of surplus aluminium fluoride in aluminium electrolyte includes mixing sodium fluoride of 15%-35% as mass of testpiece with aluminium electrolyte testpiece and adding analysis water to submerge it, placing it on sand bath of 100-120deg.c for drying it then sintering it at temperature of 740-760deg.c for 15-25min., adding water and grinding it then placing it in beaker for extracting out unreacted surplus sodium fluoride, calculating out content of unreacted surplus sodium fluoride and calculating out content of surplus aluminium fluoride reacted with sodium fluoride.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and specifically relates to a method for detecting and analyzing excess aluminum fluoride content in aluminum electrolytes. Background technique [0002] The production process of aluminum electrolysis is closely related to the composition of aluminum electrolysis. The characteristic parameter indicating the composition of aluminum electrolyte is the acidity of aluminum electrolyte, which has a significant impact on the current efficiency and energy consumption of aluminum electrolysis. At present, there are two ways to express the acidity of aluminum electrolyte: molecular ratio and excess aluminum fluoride. The expression method of molecular ratio is used in aluminum electrolysis production in my country. Accurate determination of molecular ratio requires Al 2 o 3 , CaF 2 , MgF 2 , LiF, KF, carbon slag and other non-cryolite, aluminum fluoride content data, some of these compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/49G01N1/28
Inventor 卢健肖伟峰马永国张临芝肇玉卿丁旭东任志彤牛永兰
Owner 兰州铝业有限公司
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