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Processing method of filter drum sample for collecting fluorides contained in smoke dust

A processing method and fluoride technology, which are applied in the preparation of test samples, etc., to shorten the analysis time and improve the monitoring accuracy.

Active Publication Date: 2011-11-23
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery rate of the direct distillation method can reach more than 90%, but the sample processing process takes nearly 8 hours, and the safety of the distillation device is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] A method for processing filter cartridge samples that collect fluoride in smoke. The filter cartridge sample processing process cuts the filter cartridge into pieces and puts it into a sulfuric acid solution, injects water vapor, and conducts distillation at a temperature of 145±5°C. The distillate of the sample was analyzed by the fluoride ion electrode method.

[0012] Reagents and instruments for the specific test operation process include:

[0013] 1) Reagents:

[0014] ① Sulfuric acid (volume ratio 1:1)

[0015] ② Fluorine standard stock solution: Weigh 2.210g of sodium fluoride (excellent grade, dried at 110°C for 2 hours), dissolve in water, transfer to a 1000ml volumetric flask, dilute with water to the marked line, shake well, and store in polyethylene plastic in the bottle. This solution contains 1000 μg of fluorine per milliliter of water.

[0016] ③ Fluorine standard solution: Before use, dilute the sodium fluoride standard stock solution with water to a...

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Abstract

The invention relates to a processing method of a filter drum for collecting fluorides contained in smoke dust, relating to a processing method of a filter drum sample for collecting fluorides contained in the smoke dust of an electrolytic aluminium plant and used for monitoring the content of the fluorides contained in the smoke dust exhausted from a stationary pollution source of the electrolytic aluminium plant. The processing method of the filter drum sample for collecting fluorides contained in the smoke dust of the electrolytic aluminium plant is characterized in that the processing process of the filter drum sample comprises the steps of: shearing the filter drum into pieces; adding into a sulfuric acid solution; steaming water vapor; and distilling at the temperature of 145+ / -5 DEG C to obtain distillate used for analyzing the filter drum sample by using a fluorinion electrode method. The processing method can effectively shorten the analysis time and enhance the monitoring precision.

Description

technical field [0001] The invention discloses a method for processing a filter cartridge for collecting fluoride in smoke, relating to a method for collecting filter cartridge samples for collecting fluoride in the smoke of an electrolytic aluminum plant and used for monitoring the fluoride content in the flue gas discharged from a fixed pollution source in the electrolytic aluminum plant. Background technique [0002] Fluorides are toxic and harmful fumes produced during the production of electrolytic aluminum. Dust fluorine mostly appears in the form of dust particles and droplets, including water-soluble fluorine, acid-soluble fluorine and insoluble fluorine. Generally, glass fiber filter cartridges are used for collection. Due to the small amount of collection and complex components, it is difficult to separate from the filter cartridge. At present, the acid-dissolution method and direct distillation method are often used to treat the fluoride filter cartridge samples,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/40
Inventor 胡颖海胜利何静华刘伟邢自谦
Owner GUIZHOU BRANCH CHINA ALUMINUM IND