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Method for measuring ammonium ion content of coal ash

A determination method and fly ash technology, applied in the field of ammonia desulfurization, can solve problems such as inability to detect, and achieve the effects of short time consumption, simple operation and small experimental error.

Inactive Publication Date: 2017-10-27
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, commercial concrete enterprises only add a certain concentration of sodium hydroxide solution to the fly ash to see if there is ammonia gas (ammonia smell) after heating to qualitatively identify whether there is ammonium ion in the fly ash, and how much it contains Ammonium ions cannot be detected

Method used

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  • Method for measuring ammonium ion content of coal ash
  • Method for measuring ammonium ion content of coal ash
  • Method for measuring ammonium ion content of coal ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The sample of embodiment 1 is to mix analytically pure ammonium sulfite in the common fly ash sample not containing ammonium root ion, make its ammonium root ion [NH 4 + ] content is 3.0%; The sample of embodiment 2 is to mix analytically pure ammonium bisulfite in the common fly ash sample that does not contain ammonium root ion, makes its ammonium root ion [NH 4 + ] content is 4.0%; The sample of embodiment 3 is that the analytical pure ammonium sulfite and ammonium bisulfite that respectively account for 50% are mixed in the common fly ash sample that does not contain ammonium root ion, make its ammonium root ion [NH 4 + ] The total content is 5.0%.

[0075] Example 1

[0076] Weigh 1.0g of fly ash sample containing analytically pure ammonium sulfite, accurate to 0.1mg, put it in a 250mL beaker, add 70-80mL of distilled water, cover with a watch glass, place the beaker on a magnetic stirrer and stir for 10min, After stirring, wash the watch glass and the cup wal...

Embodiment 2

[0078] Weigh 1.0g of fly ash sample containing analytically pure ammonium bisulfite, accurate to 0.1mg, put it in a 250mL beaker, add 70-80mL of distilled water, cover with a watch glass, place the beaker on a magnetic stirrer and stir for 10min , after stirring, rinse the watch glass and cup wall with a small amount of distilled water, and let it stand for 5 minutes; filter with medium-speed quantitative filter paper, collect the filtrate and lotion in a 250mL conical flask, and control the volume of the lotion within 50mL as much as possible; Add 2 drops of 1g / L methyl red indicator solution to the shaped bottle solution, add dropwise 0.1mol / L hydrochloric acid solution to adjust the solution to orange; add 15mL 250g / L formaldehyde solution to the test solution, and then add 3 drops of 10g / L phenolphthalein indicator solution, shake well, after standing for 5min, titrate slowly with 0.15mol / L sodium hydroxide standard titration solution to light red, which does not disappear ...

Embodiment 3

[0080] Weigh 1.0g of fly ash sample containing analytically pure ammonium sulfite and ammonium bisulfite, accurate to 0.1mg, put it in a 250mL beaker, add 70-80mL of distilled water, cover with a watch glass, and place the beaker under magnetic stirring Stir on the mixer for 10 minutes. After the stirring, rinse the watch glass and cup wall with a small amount of distilled water, and let it stand for 5 minutes; filter with medium-speed quantitative filter paper, collect the filtrate and lotion in a 250mL conical flask, and control the volume of the lotion at 50mL as much as possible. Within; add 2 drops of 1g / L methyl red indicator solution to the Erlenmeyer flask solution, add dropwise 0.1mol / L hydrochloric acid solution to adjust the solution to orange; add 15mL 250g / L formaldehyde solution to the test solution, and then add 3 drops of 10g / L phenolphthalein indicator solution, shake well, after standing for 5min, slowly titrate with 0.15mol / L sodium hydroxide standard titrat...

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Abstract

The invention discloses a method for measuring the ammonium ion content of coal ash and belongs to the technical field of desulfurization with ammonia. According to the forming process of a coal ash sample desulfurized with ammonia, the variety of the ammonia salt and the intrinstic chemical characteristic of the coal ash sample, the aspects of sample treatment, determination mechanism, operating steps, result calculation and the like are subjected to creative invention, the existing formaldehyde method is improved, and compared with the titrimetric method after distillation, the method has the characteristics of few experiment preparation content, simple operation, low time consumption, small experiment error and the like; and according to the method for measuring the ammonium ion content of the coal ash, the ammonia ion content of the coal ash generated by the desulfurization technology with ammonia is analyzed accurately, a scientific basis is provided for reasonable utilization of the coal ash desulfurized with ammonia, and the absolute difference of the parallel measuring result is not more than 0.06 percent. The absolute difference of different laboratory measuring results is not more than 0.12 percent.

Description

technical field [0001] The invention belongs to the technical field of ammonia desulfurization, and in particular relates to a method for determining the ammonium ion content of fly ash. Background technique [0002] With the development of commercial concrete technology in our country, in order to improve the performance of concrete mixture and reduce the cost of concrete production, fly ash is widely used as a concrete admixture. [0003] In recent years, my country has put forward higher requirements for energy saving and emission reduction. As a large coal-fired enterprise, thermal power plants have adopted desulfurization technology, among which ammonia desulfurization technology (that is, using ammonia water to contact with flue gas through spraying, absorbing flue gas Sulfur dioxide in the flue gas, eventually producing ammonium sulfite or ammonium bisulfite) has been widely used, these ammonium salts sink together with the fly ash in the flue gas, and are discharged t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 徐风广侯海军宋伟涵徐璐
Owner YANCHENG INST OF TECH
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