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Continuous determination method of potassium nitrate and sodium nitrate mixed salt bath

A determination method and potassium nitrate technology are applied in the continuous determination of potassium nitrate-sodium nitrate mixed salt in a salt bath and in the field of chemical analysis to achieve the effects of accurate and consistent detection results, simple measurement methods and convenient detection processes

Inactive Publication Date: 2017-01-25
江南工业集团有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection method of potassium nitrate and sodium nitrate mixed salt is rarely reported or even not reported. In order to detect and analyze the changes of the main components of salt bath potassium nitrate and sodium nitrate in time, ensure the quality of heat treatment of products and promote the improvement of product performance, the salt bath potassium nitrate , sodium nitrate mixed salt continuous determination method was studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of continuous assay method of salt bath potassium nitrate-sodium nitrate mixed salt, it comprises the following steps:

[0042] (1) Preparation of sample solution: Weigh about 2.5g of sample 1 (accurate to 0.0001g) that has been ground evenly, put it into a 100mL beaker, dissolve it in water, transfer it to a 250mL volumetric flask, dilute to the mark with water, shake well, Dry filter, discard the initial filtrate 5mL ~ 10mL, to obtain the solution of sample 1.

[0043] (2) Determination of potassium nitrate content: draw 10.00mL of the prepared sample 1 solution into a 100mL beaker, add 30mL of water, 1 drop of methyl red ethanol indicator solution (1g / L), and use glacial acetic acid solution (100g / L) until it just turns red, heat to 40°C (continue to keep the solution slightly red), take it off, add 8mL sodium tetraphenylborate ethanol solution (34g / L) dropwise under stirring, continue to stir for 1min, and place it for 10min. Use a sand core crucible with a...

Embodiment 2

[0066] The same method as in Example 1 was adopted, except that Sample 1 was replaced with Sample 2.

[0067] After measurement and calculation, it is concluded that sample 2 contains 51.55% potassium nitrate and 48.45% sodium nitrate.

Embodiment 3

[0069] The same method as in Example 1 was adopted, except that Sample 1 was replaced with Sample 3.

[0070] After measurement and calculation, it was found that sample 3 contained 48.94% potassium nitrate and 51.06% sodium nitrate.

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Abstract

The invention discloses a continuous determination method of a potassium nitrate and sodium nitrate mixed salt bath. The method provided by the invention comprises the following steps: preparing a sample solution, determining and calculating the content of potassium nitrate, determining and calculating sodium nitrate and the like. In the acidic medium of acetic acid, sodium tetraphenylborate reacts with potassium nitrate to produce a potassium tetraphenylborate precipitate, filtering, drying and weighing are carried out, and then the content of potassium nitrate is calculated; in the presence of molybdenum salt, a concentrated sulfuric acid is used to acidify, the nitrate reacts with excess ammonium ferrous sulfate standard solution, sodium diphenylamine sulfonate is used as an indicator, a potassium dichromate standard titration solution is used for back titration, the total amount of the nitrate is calculated according to the amounts of the ferrous ammonium sulfate and the potassium dichromate standard titration solution, and the amount of potassium nitrate equivalent to sodium nitrate is subtracted to obtain the content of sodium nitrate. The determination method provided by the invention has the advantages of simplicity, convenient detection process, quickness, environmental protection, low cost, and accurate and consistent detection result, and provides support for the maintenance and quality control of potassium nitrate and sodium nitrate.

Description

technical field [0001] The invention relates to a continuous determination method for salt bath potassium nitrate-sodium nitrate mixed salt, which belongs to the field of chemical analysis methods. Background technique [0002] Heat treatment Salt bath heating is to use the liquid medium formed after salt melting to heat the workpiece. The heating speed is fast, the heating temperature is uniform, and the working temperature range is wide. Under good working conditions, the workpiece can be heated without oxidation and decarburization, and It is convenient for local heating and quenching, graded quenching and austempering. by KNO 3 -NaNO 3 The composition of nitrate salt bath is especially suitable for quenching and heating of aluminum alloy parts, and it is also widely used in tempering and step quenching. When the nitrate salt bath works for a certain period of time, the salt bath will age and affect the heating properties. In this case, it is necessary to remove the sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 许自强任志忠罗臻葵尹公晖许成姚春臣叶甜甜
Owner 江南工业集团有限公司
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