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Method for detecting sulfur content in raw coal

A technology of sulfur content and raw coal, applied in the field of coal chemical industry, can solve the problems of insufficient detection sensitivity, high detection cost, high detection limit, etc., and achieve the effect of weakening spectral interference, improving sensitivity and reducing samples

Inactive Publication Date: 2016-12-07
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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Problems solved by technology

Sulfur content in coal is an important criterion for evaluating coal quality, while the traditional method of machine-based detection of sulfur content requires a large number of samples, high detection costs, high detection limits, and insufficient detection sensitivity

Method used

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  • Method for detecting sulfur content in raw coal

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Embodiment 1

[0021] (1) Prepare pararosaniline (PRA) solution: draw 25mL of PRA stock solution (0.20g / 100mL) into a 100mL volumetric flask, add 30mL of 85% phosphoric acid, 12mL of concentrated hydrochloric acid, dilute with water to the mark, and shake well.

[0022] (2) Formaldehyde absorption solution: absorb 5.5mL of 36%-38% formaldehyde solution, 20.00mL of CDTA-2Na solution, weigh 2.04mg of potassium hydrogen phthalate, dissolve in a small amount of water, combine the three solutions, and then Dilute to 100mL with water.

[0023] (3) Configure sulfur dioxide standard solution: take 0.2g of sodium sulfite and dissolve it in 200mL of water, take 20mL of the above solution and dilute it to 100 / 250 / 500 / 1000mL, etc.; curve.

[0024] (4) Combust 100mg of raw coal in a small boiler, and absorb the exhaust gas through the pipeline with excess formaldehyde absorbing liquid to enrich sulfur dioxide in the formaldehyde solution.

[0025] (5) Pipette 50 mL of the enriched formaldehyde solution...

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Abstract

The invention belongs to the technical field of coal chemical industries, and particularly relates to method for detecting sulfur content in raw coal. The method includes the steps: preparing PRA (pararosaniline) solution, formaldehyde absorption solution and sulfur dioxide standard solution; (2) absorbing raw coal combustion exhaust gas by excessive formaldehyde absorption solution through a pipeline, and enriching sulfur dioxide in the formaldehyde solution; (3) taking the enriched formaldehyde solution, adding the PRA solution into the formaldehyde solution, and guttatim adding sodium hydroxide solution into the formaldehyde solution until a purple red compound does not increase; (4) detecting solution displaying purple red by an ultraviolet spectrophotometer, comparing with a standard curve, and calculating sulfur content; (5) converting final sulfur content according to the proportion of the total volume of the formaldehyde solution to the volume of formaldehyde absorbing solution. The method is simple and easy to operate, and accuracy and sensitivity of a detecting result are improved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for detecting sulfur content in raw coal. Background technique [0002] Raw coal is an important fossil fuel, and high-quality coal plays an extremely important role in electricity and heating in daily life. The sulfur content in coal is an important criterion for evaluating the quality of coal. However, the traditional method of machine detection of sulfur content requires many samples, high detection cost, high detection limit and insufficient detection sensitivity. Contents of the invention [0003] In order to solve the above-mentioned problems in the prior art, the present invention provides a method for detecting sulfur content in raw coal. [0004] The technical scheme that the present invention adopts is as follows: [0005] A method for detecting sulfur content in raw coal, comprising the following steps: [0006] (1) Configure pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/79
Inventor 池明刘鑫业李鹏廷姜大川于京生
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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