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Testing and metering method for content of sodium in coal

A measurement method and technology for sodium content are applied in the field of analysis of sodium content in coal, which can solve problems such as changes in sodium content and inaccurate test results, and achieve the effect of accurate measurement

Inactive Publication Date: 2016-04-20
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defect that the sodium content changes due to mass loss in the existing sodium content testing and measurement methods in coal, or the sodium volatilization causes inaccurate test results, the technical problem to be solved by the present invention is to provide a more accurate coal Sodium content test and measurement method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Method and procedure for testing sodium in Shaerhu coal and Tongtai coal using ultrapure water as leaching solution.

[0019] Take 2g of coal sample, use 80mL of ultra-pure water as the leaching solution, keep the temperature in a constant temperature water bath shaker at 60°C for 24 hours, take it out, cool it, and use a solvent filter equipped with a water-based filter membrane to extract the leaching solution under vacuum. The liquid was separated from the filter residue, the filter residue was collected and dried at 60°C, the filtrate was fixed to volume in a 250mL volumetric flask, and the content of Al, Fe, Ca, Mg, Ti, K, Na, P, Mn in the filtrate after constant volume was tested by ICP, and the remaining content The extremely low impurity elements are ignored, and the percentage content of the corresponding elements in the unit mass of coal is calculated, and the total percentage content is recorded as W after conversion into the percentage content of the correspo...

Embodiment 2

[0037] The method and steps of testing sodium in Shaerhu coal and Tongtai coal using 0.25mol / L hydrochloric acid solution as the leaching solution.

[0038] Take 2g of coal sample, use 80mL of 0.25mol / L hydrochloric acid solution as the leaching solution, keep the temperature in a constant temperature water bath shaker at 60°C for 24 hours, take it out, cool it, and use a solvent filter equipped with a water filter membrane under vacuum conditions Separate the leaching solution from the filter residue, collect the filter residue and dry it at 60°C, set the filtrate to volume in a 250mL volumetric flask, and use ICP to test the contents of Al, Fe, Ca, Mg, Ti, K, Na, P, and Mn in the filtrate after constant volume , the remaining impurity elements with extremely low content are ignored, and the percentage content of the corresponding elements in the unit mass of coal is calculated, and the total percentage content is recorded as W after conversion into the percentage content of t...

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Abstract

The invention relates to an analysis method for chemical components of coal and discloses a more accurate testing and metering method for the content of sodium in coal. The method comprises the following steps: extraction of a coal sample; leaching of the coal sample; ash preparation at low temperature; respective measurement of the contents of Na2O in coal in the steps of leaching and ash preparation; and calculation of the content of and / or the content of sodium in the coal. In the step of leaching, the coal sample and ultrapure water or a hydrochloric acid solution with a concentration of 0.1 to 0.5 mol / L are maintained in a constant-temperature water-bath shaking table at a constant temperature of 40 to 80 DEG C for 2 to 24 h; then leaching liquid and a filter residue are separated in vacuum; an inductively coupled plasma atomic emission spectrometer (ICP) is employed to measure the content of sodium in filtrate; calculation is carried out so as to obtain the content of Na2O; and the obtained filter residue is dried and metered, and ash preparation is carried out at 550 to 700 DEG C. The method provided by the invention realizes more accurate testing and metering of sodium in coal and is favorable for better research on the proportions of sodium of different occurrence forms and the migration rule of sodium at different temperatures.

Description

technical field [0001] The invention relates to a coal chemical composition analysis method, in particular to an analysis method for sodium content in coal. Background technique [0002] my country's Xinjiang region stores a large number of undeveloped coal resources, accounting for 40.6% of China's predicted total coal resources, ranking first in the country. However, in the process of coal utilization in Xinjiang, it is prone to contamination and coking, which seriously limits its wide application. A large number of studies have shown that the cause of contamination is the high content of alkali metals in coal, especially volatile sodium, and the content of volatile sodium is related to the occurrence and migration of sodium in coal. To study the proportion of sodium in different forms and the migration law of sodium at different temperatures, accurate measurement and measurement of total sodium in coal is the key. [0003] However, the current research methods mostly fo...

Claims

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Application Information

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IPC IPC(8): G01N21/71G01N1/34
CPCG01N1/34G01N21/71
Inventor 史慧娟周棋张章冉燊铭
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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