Method for measuring mercury element content of gangue or fly ash

A measurement method and element content technology, which is applied in the measurement of mercury element content in coal gangue or fly ash, and the measurement field of trace element content, can solve the problems of large error and low accuracy, and achieve good potential and value effects

Inactive Publication Date: 2015-08-19
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As mentioned above, there are many methods for removing mercury from different media in the prior art, all of which need to know the content of mercury contained in the media before measurement, and although some methods for removing mercury in the media have been reported in the prior art It is a method for determining the mercury content in coal, but there are still some defects, such as low accuracy rate and large error, etc.

Method used

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  • Method for measuring mercury element content of gangue or fly ash
  • Method for measuring mercury element content of gangue or fly ash
  • Method for measuring mercury element content of gangue or fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0055] S1: Digestion of test samples

[0056] S1-1: Weigh coal gangue (taken from Guizhou), then add acid hydrolysis solution, the acid hydrolysis solution is 65% nitric acid, 40% hydrofluoric acid and 85% mass percent concentration % mixture of phosphoric acid, the volume ratio of the three is 4:2:1, to obtain an acid hydrolyzate sample; wherein, the mass volume ratio of the test sample to the acid hydrolyzate is 1:15g / ml;

[0057] S1-2: The acid hydrolyzate sample is subjected to microwave digestion, and the specific digestion process is as follows:

[0058] (1) at a temperature of 140° C. and a pressure of 20 atm, the acid hydrolyzate sample was subjected to microwave digestion for 3 minutes;

[0059] (2) be heated to temperature 170 ℃ and pressurize to pressure 30atm, continue to carry out microwave digestion under this temperature and pressure for 3 minutes;

[0060] (3) be heated up to temperature 200 ℃ and pressurize to pressure 35atm, continue to carry out microwave ...

Embodiment 2

[0076] S1: Digestion of test samples

[0077] S1-1: Weigh fly ash (taken from Guizhou), then add acidolysis solution, the acidolysis solution is 60% nitric acid, 45% hydrofluoric acid and 45% mass percent concentration of A mixture of 90% phosphoric acid, the volume ratio of the three is 3:1.5:1, to obtain an acid hydrolysis solution sample; wherein, the mass volume ratio of the test sample to the acid hydrolysis solution is 1:20g / ml;

[0078] S1-2: The acid hydrolyzate sample is subjected to microwave digestion, and the specific digestion process is as follows:

[0079] (1) Under the temperature of 135 ° C and the pressure of 18 atm, the acid hydrolyzate sample was subjected to microwave digestion for 5 minutes;

[0080] (2) be heated up to temperature 165 ℃ and pressurize to pressure 31atm, continue to carry out microwave digestion 2 minutes under this temperature and pressure;

[0081] (3) be heated up to temperature 195 ℃ and pressurize to pressure 36atm, continue to car...

Embodiment 3

[0096] S1: Digestion of test samples

[0097] S1-1: Weigh coal gangue (taken from Shuozhou, Shanxi), then add acid hydrolysis solution, which is 70% nitric acid, 40% hydrofluoric acid and 40% mass percent concentration It is a mixture of 85% phosphoric acid, and the volume ratio of the three is 5:2:1, to obtain an acid hydrolyzate sample; wherein, the mass volume ratio of the test sample to the acid hydrolyzate is 1:25g / ml;

[0098] S1-2: The acid hydrolyzate sample is subjected to microwave digestion, and the specific digestion process is as follows:

[0099] (1) Under the temperature of 145 ° C and the pressure of 22 atm, the acid hydrolyzate sample was subjected to microwave digestion for 3 minutes;

[0100] (2) be heated up to temperature 175 ℃ and pressurize to pressure 29atm, continue to carry out microwave digestion 4 minutes under this temperature and pressure;

[0101] (3) be heated up to temperature 205 ℃ and pressurize to pressure 34atm, continue to carry out micr...

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Abstract

The invention provides a method for measuring mercury element content of gangue or fly ash. The method comprises the following steps of S1, test sample digestion, S2, electrochemical detection, and S3, mercury content calculation. The method utilizes unique processes and technological parameter selection, produces a good measurement result, has high accuracy and sensitivity, provides a brand new measurement method for mercury element content determination, and has good application value and prospect in industry and scientific research.

Description

technical field [0001] The invention relates to a method for measuring the content of trace elements in coal gangue or fly ash, more particularly, the invention relates to a method for measuring the content of mercury in coal gangue or fly ash, belonging to the technical field of trace element measurement. Background technique [0002] Trace amounts of mercury are usually contained in coal gangue or fly ash, and mercury belongs to the class of heavy metals, which has serious toxic and polluting effects on the environment such as water and atmosphere. For the human body, mercury vapor is a highly toxic nervous system poison, but because the human nervous system is difficult to remove this element, mercury has the characteristics of long-term accumulation in the human body. [0003] It is precisely because of such harmful side effects of mercury that it is very important to measure and determine the content of mercury in certain minerals and industrial wastes. the removal of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 许零李晓艳雷新野王秀腾林翎
Owner PEKING UNIV
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