Method for determining iron sesquioxide content in coal combustion improver

A technique for the determination of ferric oxide and its method, which is applied in the field of chemical analysis, can solve problems such as the difficulty of ferric oxide content, and achieve the effects of shortening the detection cycle, improving detection efficiency, and high analysis accuracy

Active Publication Date: 2013-12-11
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems such as the difficulty in determining the content of ferric oxide in the coal catalytic combustion combustion accelerant used for blast furnace injection, the present invention provides a method that does not need to use a specific analytical instrument, and is easy to operate, fast, and low in analysis cost. Method for Determination of Ferric Oxide Content in Coal Combustion Promoter with Good Stability, Reproducibility and Accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Described potassium dichromate standard solution is prepared by the following steps:

[0050] (1) Put 1.0g of commercially available analytically pure potassium dichromate in a 500mL beaker;

[0051] (2), according to 100mL / g 重铬酸钾 amount, add distilled water to the beaker in step (1), and dissolve completely;

[0052] (3) Transfer the solution in step (2) into a 1000mL volumetric flask, dilute to 1000mL with water, and shake well to obtain a potassium dichromate standard solution of about 1.0mg / mL.

[0053] The hydrochloric acid, sulfuric acid, phosphoric acid, potassium fluoride, stannous chloride, sodium tungstate, titanium trichloride, potassium dichromate and / or sodium diphenylamine sulfonate are commercially available analytically pure products.

[0054] The utensils and instruments are common laboratory utensils and instruments.

Embodiment 1

[0056] Reagent used in the present invention and preparation thereof:

[0057] 1. Potassium fluoride (25%): Weigh 25g of potassium fluoride and dissolve it in 100mL of distilled water, transfer it into a plastic bottle for storage;

[0058] 2. Stannous chloride (6%): Dissolve 6g of stannous chloride in 20mL of hydrochloric acid with a density of 1.19g / mL, dilute to 100mL with distilled water, and add a small amount of metal tin particles;

[0059] 3. Sodium tungstate (25%): Weigh 25g of sodium tungstate and dissolve it in 50mL of distilled water. If it is turbid, add more filtration, add 5mL of phosphoric acid with a density of 1.69g / mL, dilute to 100mL with distilled water, and shake well;

[0060] 4. Titanium trichloride solution: take 15-20% titanium trichloride liquid with volume ratio HCl:H 2 O=5:95 hydrochloric acid diluted 20 times, add a layer of liquid paraffin protection;

[0061] 5. Sodium diphenylamine sulfonate indicator (0.3%): Weigh 0.3g of sodium diphenylamine ...

Embodiment 2

[0070] 1. Titration of sample

[0071] 1A. In 0.5000g of coal combustion improver to be tested, press 40mL / g 试样 The amount of adding volume ratio H 2 SO 4 : H 3 PO 4 =1:1 sulfur phosphorus mixed acid, get sample solution;

[0072] 1B. In the sample solution obtained in step 1A, press 10mL / g 试样 Add 25% potassium fluoride solution, shake the Erlenmeyer flask to disperse the sample, put it on an electric heating plate heated to 300-350°C to dissolve, evaporate and smoke to the bottle mouth, take it down and cool it to room temperature, and get sample solution;

[0073] 1C. In the sample solution obtained in step 1B, press 20mL / g 试样 The amount of adding volume ratio HCl:H 2 O=1:1 hydrochloric acid, rinse the mouth of the bottle with a small amount of water, dropwise add 6% stannous chloride solution to reduce to light yellow, and obtain the sample solution;

[0074] 1D. In the sample solution obtained in step 1C, press 80mL / g 试样 Add distilled water, put it on the electri...

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Abstract

The invention discloses a method for determining iron sesquioxide content in coal combustion improver, which comprises the following steps: dissolving a sample to be measured in mixed sulfuric acid and phosphoric acid with potassium fluoride used as cosolvent, fuming to a bottle neck, taking down, and cooling; adding hydrochloric acid, dropwisely adding stannous chloride, reducing to light yellow, heating, taking down, and cooling to 50-60 DEG C; dropwisely adding sodium tungstate, reducing to blue with titanium trichloride, and oxidizing with a potassium dichromate solution until blue disappears; dropwisely adding sodium diphenylamine sulfonate, and titrating with a potassium dichromate standard solution to stable purple (end point), thus obtaining the titer of the sample to be measured in milliliter; and calibrating the titer value of a standard substance of which the iron sesquioxide content is known, and obtaining the iron sesquioxide content in the sample according to the titer value and the titer of the sample in milliliter. According to the invention, no specific analytical apparatus is required; the method is convenient and quick to operate and low in analysis cost; and the determination result has favorable stability, reproducibility and accuracy. Thus, the method can satisfy determination of iron sesquioxide content in coal catalytic combustion improver for routine blast furnace injection.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a method for measuring the content of ferric oxide, in particular to a method for measuring the content of ferric oxide in a coal catalytic combustion combustion aid for blast furnace injection. Background technique [0002] It is an important technical means to reduce the production cost of pig iron, reduce environmental pollution and optimize the process structure to greatly increase the coal injection rate of blast furnace. The combustion performance of pulverized coal is the restrictive link to increase the coal injection ratio of blast furnace. In order to improve the combustion performance of the pulverized coal itself, the combustion rate of the pulverized coal injected into the blast furnace can be improved by adding an appropriate amount of combustion accelerant into the pulverized coal injected into the blast furnace. Moreover, a large number of industrial furna...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 曾海梅高玲李宏萍高丽萍
Owner WUKUN STEEL
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