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Method for measuring alumina in aluminium fluoride

A medium-alumina, determination method technology, applied in chemical analysis and detection of substances, determination of alumina content in aluminum fluoride products, can solve problems such as cost increase, slow detection speed, measurement numerical analysis error, etc., and achieve savings Cost, analysis error reduction, and the effect of improving the measurement speed

Active Publication Date: 2008-05-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production of aluminum industry, the aluminum fluoride products produced by fluoride salt manufacturers will contain some alumina, especially the aluminum fluoride produced by dry method, in which the alumina content exceeds 10%, which will affect the downstream remelting Controlled by the production process of aluminum ingots, there is currently no direct method for the determination of alumina content in aluminum fluoride
[0003] At present, the determination of the content of alumina in aluminum fluoride is based on the former Soviet Union's national standard ГO C T19181-78, and the F, AL, Na, and SiO in the sample must be determined. 2 , Fe 2 o 3 , SO 4 2- , moisture and other ingredients, the content of alumina is indirectly calculated by the method of chemical balance, while the current Chinese national standard method uses the ignition loss at 550°C as the moisture content. In most cases, the ignition loss at 550°C The decrement and moisture content are not completely consistent, and there are analysis errors in the measured values ​​of various components. The sum of the errors makes the calculated aluminum oxide content error may exceed 2%, and the measurement results are basically impossible to reproduce.
In addition, due to the need to determine the content of multiple components, the detection speed is slow and the cost increases
[0004] In the production process of aluminum ingots for remelting, if the content of alumina in aluminum fluoride cannot be accurately known, the precise control of the electrolyte molecular ratio will be affected. If the content of alumina in aluminum fluoride is too high, it may cause Partial alumina content in the electrolyte is too high, affecting production technical indicators

Method used

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  • Method for measuring alumina in aluminium fluoride
  • Method for measuring alumina in aluminium fluoride
  • Method for measuring alumina in aluminium fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The aluminum fluoride sample was ground until it passed through a 74 μm sieve, baked in an oven at 105°C for 2 hours, and then cooled to room temperature in a desiccator.

[0031] Put the platinum crucible in a high-temperature furnace and burn at 1000°C for 30 minutes, take out the platinum crucible and cover, put it in a desiccator, cool to room temperature, and weigh.

[0032] Weigh 1.0000g sample, place the sample in a 400ml beaker, add 150ml water, stir with a glass rod to distribute the sample evenly at the bottom of the beaker, cover the watch glass, heat and boil for 20min (stir constantly and keep the original volume), then Add 50ml H 3 BO 3 -NaOH solution, continue to heat and boil for 15min (stir continuously and maintain the original volume), filter with slow filter paper, transfer all the precipitate to the filter paper, wash with hot water until neutral (tested with phenolphthalein ethanol solution), put the precipitate together with the filter paper Put...

Embodiment 2

[0036] The aluminum fluoride sample was ground until it passed through a 74 μm sieve, baked in an oven at 110°C for 2 hours, and then cooled to room temperature in a desiccator.

[0037] Put the platinum crucible in a high-temperature furnace and burn at 1000°C for 30 minutes, take out the platinum crucible and cover, put it in a desiccator, cool to room temperature, and weigh.

[0038] Weigh 0.5000g sample, place the sample in a 400ml beaker, add 150ml water, stir with a glass rod so that the sample is evenly distributed on the bottom of the beaker, cover the watch glass, heat and boil for 15min (stir constantly and keep the original volume), then Add 30ml H 3 BO 3 -NaOH solution, continue to heat and boil for 15min (stir continuously and maintain the original volume), filter with slow filter paper, transfer all the precipitates to the filter paper, wash with hot water until neutral (check the pH of the filtrate to about 7 with PH test paper), Put the precipitate together w...

Embodiment 3

[0042] Weigh 1.60g of aluminum fluoride trihydrate and place it in a 400ml beaker, add 0.0500g of alumina, add 150ml of water, stir with a glass rod so that the sample is evenly distributed on the bottom of the beaker, cover with a watch glass, heat and boil for 20min (stir continuously and keep the original volume), then add 50ml H 3 BO 3 -NaOH solution, continue to heat and boil for 15min (stir continuously and maintain the original volume), filter with medium-speed filter paper, transfer all the precipitate to the filter paper, wash with hot water until neutral (tested with phenolphthalein ethanol solution), put the precipitate together with the filter paper Put it into a platinum crucible with constant weight, ash it on an electric furnace, move it into a high-temperature furnace at 1000°C, burn it for 30 minutes, take it out, put it in a desiccator, cool it to room temperature, and weigh it.

[0043] After 5 measurements, the recovery of alumina was between 0.0490 and 0....

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Abstract

The invention is the testing method of the alumina in Al fluoride and relates to the chemical analyzing and testing technology, especially the testing of alumina content in Al fluoride products. The invention comprises the collocation of the reagent, the black test, the refining of the samples, the measurement of the samples, the dissolving of the samples, the abstersion of the deposits, the burning condition of the deposits, the cooling of the deposits and the metage process. The invention can fast and precisely test the alumina content in Al fluoride and can accelerate the speed by 5 times and lower the cost by 80% and the analyzing error by 60%.

Description

technical field [0001] The invention discloses a method for determining alumina in aluminum fluoride, relates to a material chemical analysis and detection technology method, and is suitable for determining the content of alumina in aluminum fluoride products. Background technique [0002] In the production of aluminum industry, the aluminum fluoride products produced by fluoride salt manufacturers will contain some alumina, especially the aluminum fluoride produced by dry method, in which the alumina content exceeds 10%, which will affect the downstream remelting It is controlled by the production process of aluminum ingots, but there is currently no direct method for the determination of alumina content in aluminum fluoride. [0003] At present, the determination of the content of alumina in aluminum fluoride is based on the former Soviet Union's national standard ГO C T19181-78, and the F, AL, Na, and SiO in the sample must be determined. 2 , Fe 2 o 3 , SO 4 2- , moi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N1/28
Inventor 冯敬东张树朝张爱芬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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