Continuous determination method of sodium nitrite-potassium nitrate mixed salt in salt bath

A technology of sodium nitrite and a determination method is applied in the field of determination of nitrate salt bath components and chemical analysis, and achieves the effects of accurate and consistent detection results, low cost and simple detection method

Active Publication Date: 2011-01-19
江南工业集团有限公司
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Problems solved by technology

In the background technology, there is no publicly published detection method of sodium nitrite and potassium nitrate mixed salt in China at present. In order to detect and analyze the main component changes of the quenchin

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  • Continuous determination method of sodium nitrite-potassium nitrate mixed salt in salt bath
  • Continuous determination method of sodium nitrite-potassium nitrate mixed salt in salt bath
  • Continuous determination method of sodium nitrite-potassium nitrate mixed salt in salt bath

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with specific embodiments.

[0038] A kind of continuous determination method of salt bath sodium nitrite, potassium nitrate mixed salt, the technical scheme that it adopts comprises following specific steps:

[0039] 1. Sample solution preparation

[0040] Weigh 2.50 g of the finely ground mixed salt of sodium nitrite and potassium nitrate and place it in a 100 ml beaker, dissolve it in water and transfer it to a 250 ml volumetric flask, dilute with water to the maximum scale, shake well, dry filter, and discard 5 ~10 mL of starting solution.

[0041] 2. Calculate the content of sodium nitrite in the sample solution

[0042] Draw 10.00 ml of one-fifth potassium permanganate standard solution with a concentration of 0.1-0.2 mol / L and place it in a 250 ml Erlenmeyer flask, add 20 ml of water and 5 ml of sulfuric acid solution (1+1), shake well, and make Potassium permanganate standard solution is...

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Abstract

The invention relates to a continuous determination method of sodium nitrite-potassium nitrate mixed salt in a salt bath, which is mainly technically characterized by firstly heating sample solution of the sodium nitrite-potassium nitrate mixed salt to a certain temperature, using potassium permanganate standard solution for titration under appropriate acidity, and utilizing the quantitative reaction of sodium nitrite and the potassium permanganate standard solution to calculate the content of the sodium nitrite in the sample solution; further acidifying the sample solution, adding excess ferrous ammonium sulphate standard solution, heating till boiling, keeping for 2-4 minutes, cooing to normal temperature, then sequentially adding water, phosphoric acid solution and sodium diphenylamine sulfonate indicator solution, using the potassium permanganate standard solution for titration, obtaining the volume of the potassium permanganate standard solution consumed by the sample solution, simultaneously carrying out a blank test, obtaining the volume of the potassium permanganate standard solution consume in the blank test, and further calculating the content of potassium nitrate in the sample solution. The method can detect the change situation of components in the salt bath and prevent the components in the salt bath from aging, and has the characteristics of simple method, rapidness, low cost, high accuracy and the like.

Description

technical field [0001] The invention relates to a continuous determination method of sodium nitrite and potassium nitrate mixed salt in a salt bath, which belongs to the field of chemical analysis methods, and is especially suitable for the determination of nitrate salt bath components during isothermal cooling, graded cooling and tempering heating of steel parts . Background technique [0002] Heat treatment salt bath heating is to use the liquid medium formed after salt melting to heat the workpiece. It has a fast heating speed and a wide working temperature range, which can realize non-oxidative corrosion and non-decarburization heating of the workpiece. When using the mixed salt of sodium nitrite and potassium nitrate for salt bath, the composition of the salt bath will change after working for a period of time, resulting in "aging" phenomenon and affecting the heat treatment quality of the product, which requires detection of the composition of the salt bath and Make t...

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Application Information

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IPC IPC(8): G01N21/79
Inventor 许自强汪灿肖秋兰陈子宁曹艳张波姚春臣尹公晖黄凌
Owner 江南工业集团有限公司
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