Method for detecting nitrogen content in steelmaking auxiliary materials

A technology of nitrogen content and determination method, applied in the direction of chemical method analysis, measuring devices, analysis materials, etc., can solve the problems of no unified detection standard method, reduce the use of toxic and harmful chemical reagents, improve detection efficiency, and shorten the detection cycle Effect

Inactive Publication Date: 2020-07-14
SGIS SONGSHAN CO LTD
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Problems solved by technology

[0006] With the development of steelmaking technology, steelmaking auxiliary materials used in iron and steel smelting include refining slag adjustment agent, refining conditioning agent, high alumina refining slag, aluminum slag balls, etc. These complex steelmaking auxiliary materials and their composition often occur Changes, currently there is no uniform detection standard method

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  • Method for detecting nitrogen content in steelmaking auxiliary materials
  • Method for detecting nitrogen content in steelmaking auxiliary materials
  • Method for detecting nitrogen content in steelmaking auxiliary materials

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Embodiment 1

[0081] Example 1: A method for measuring nitrogen content in steelmaking auxiliary materials

[0082] Weigh 1g of the auxiliary material sample into the Erlenmeyer flask, add 10mL phosphoric acid, heat to dissolve at 75℃, add 20mL concentrated sulfuric acid (the volume ratio of concentrated sulfuric acid to distilled water is 1:1), continue to boil, add 0.2g Sodium fluoride, heated until concentrated sulfuric acid smokes for 5 minutes, remove, cool, add 50mL distilled water, shake well, then boil to dissolve the salts, remove and cool to room temperature, add 30mL boric acid solution and 4 in a 300mL conical flask Drop the methyl red-methine blue indicator and place it at the lower end of the condenser. Pour the dissolved test solution from the funnel into the distillation flask, and then slowly add 80 mL of sodium hydroxide solution into the distillation flask through the funnel. Power on heating, control the distillation speed to 6-8mL / min, and finish when the distillate reach...

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Abstract

The invention discloses a method for determining the nitrogen content in a steelmaking auxiliary material. The method comprises the following steps of dissolving a steelmaking auxiliary material sample by using a phosphoric acid solution and a concentrated sulfuric acid solution, carrying out steam distillation, separation and dissolution to obtain a sample test solution, absorbing with a boric acid solution, titrating with a sulfamic acid standard solution, taking a methyl red-methylene blue indicator as a titrant, and recording the titration volume of the sulfamic acid standard solution, andcalculating the mass fraction of nitrogen according to a formula 1. The method disclosed by the invention overcomes the defects of a method for measuring the nitrogen content in steelmaking auxiliarymaterials in the industry; the nitrogen content of the steelmaking auxiliary material with complex components is measured through specific dissolution, digestion treatment, reagent selection and other comprehensive technical schemes of a sample system, the detection result is good in accuracy, data is stable, reliability is good, meanwhile, operation is simpler, and the method belongs to a brand-new design scheme.

Description

Technical field [0001] The invention belongs to the technical field of nitrogen measuring methods, and specifically relates to a method for measuring nitrogen content in steelmaking auxiliary materials. Background technique [0002] Nitrogen is a very familiar non-metal element. Most nitrogen exists in the atmosphere as elemental molecules. In nature, there are not many inorganic nitrogen compounds, and the main forms are nitrates and ammonium salts. Nitrogen is a blue, odorless gas, slightly soluble in water, non-combustible, melting point -210℃, boiling point -195.8℃. Nitrogen enters the steel with the charge and furnace gas, and is considered an impurity element. The presence of high nitrogen in steel will cause the macroscopic structure of the steel to become loose and even form bubbles. For low-carbon steel, while increasing the strength and hardness, the toughness decreases, the notch sensitivity increases, and blue brittleness occurs. In stainless steel, excessive nitrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/162
Inventor 赵孟群罗慧君肖命冬曾赞喜黄合生匡争华黄波尚聪亚彭萍萍欧甲招黄宗权余雷
Owner SGIS SONGSHAN CO LTD
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