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Method for determining content of nitric acid in titanium plate pickling solution

A technology of nitric acid content and pickling solution, which is applied in the field of chemical analysis, can solve the problems of unsuitable pickling solution, etc., and achieve the effect of strong practical application value, simple operation and high accuracy

Inactive Publication Date: 2014-01-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the journal document "Determination of Pickling Solution for Martensitic Stainless Steel", the concentration of nitric acid is calculated by subtracting the total acidity and the content of hydrofluoric acid, which cannot be applied to the pickling solution for titanium plates
[0004] Since there are no currently effective industry standards and national standards for the determination of nitric acid content in the pickling solution for titanium plates, in order to achieve quality control of the pickling solution for titanium plates, it is urgent to develop a method that is accurate, reliable, and has application value. Determination method of nitric acid content in titanium plate pickling solution

Method used

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  • Method for determining content of nitric acid in titanium plate pickling solution

Examples

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example 1

[0055] Determination of nitric acid content in titanium plate pickling solution by potassium dichromate titration.

[0056] Accurately pipette 2.00mL of titanium plate pickling solution into a 100mL volumetric flask, dilute with water to constant volume, shake well, and divide 10.00mL into a 500mL conical flask; add 20.00mL to the divided test solution with a concentration of 0.05028mol / L of ferrous ammonium sulfate standard solution, 10mL of sulfuric acid, heated and boiled for 2min, removed and cooled to room temperature; then, added 70mL of water, 2mL of phosphoric acid, 3mL of saturated boric acid solution, 3 drops to 5 drops of sodium diphenylammonium sulfonate, with heavy Potassium chromate standard titration solution (C K2Cr2O7 =0.00833mol / L) titrated until the solution showed a stable purplish red as the end point, the volume of potassium dichromate standard titration solution consumed was 11.90mL; the nitric acid content was calculated according to formula 1.

[005...

example 2

[0060] Determination of nitric acid content in titanium plate pickling solution by ceric sulfate titration.

[0061] Accurately pipette 1.00mL of titanium plate pickling solution into a 500mL conical flask, add 20.00mL of ferrous ammonium sulfate standard solution with a concentration of 0.05322mol / L, 30mL of sulfuric acid, heat and boil for 5min, remove and cool to room temperature; add 70mL of water , 5mL phosphoric acid, 5mL saturated boric acid solution, 3 drops to 5 drops of sodium diphenylammonium sulfonate, titrate with ceric sulfate standard titration solution (concentration is about 0.10mol / L) until the solution presents a stable purple red as the end point, the consumed The volume of ceric sulfate standard titration solution is 6.75mL; calculate the nitric acid content according to formula 1.

[0062] w HNO 3 = 0.05322 × ( ...

example 3

[0065] Determination of nitric acid content in titanium plate pickling solution by potassium permanganate titration.

[0066] Accurately pipette 2.00mL of titanium plate pickling solution into a 100mL volumetric flask, dilute with water to constant volume, shake well, and divide 5.00mL into a 500mL conical flask; add 25.00mL to the divided test solution at a concentration of 0.1005mol / L of ferrous ammonium sulfate standard solution, 10mL of sulfuric acid, heated and boiled for 5min, removed and cooled to room temperature; added 70mL of water, 2mL of phosphoric acid, 5mL of boric acid solution, and titrated with potassium permanganate standard solution (concentration: 0.02000mol / L ) is titrated until the solution presents a stable reddish color as the end point, the volume of the consumed potassium permanganate standard titration solution is 9.20mL, and the nitric acid content is calculated according to formula 1.

[0067] w HN ...

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Abstract

The invention provides a method for determining the content of nitric acid in a titanium plate pickling solution. The method comprises the steps as follows: preparing a Fe<2+> standard solution; using a portion of titanium plate pickling solution as the test solution, adding the Fe<2+> standard solution into the test solution and uniformly mixing, then adding sulfuric acid, heating and boiling to enable the nitric acid in the test solution and the Fe <2+> to perform a full oxidation reaction, and cooling to the room temperature, wherein the excess Fe<2+> standard solution is needed; using a standard titration solution to titrate the Fe<2+> which is not oxidized in the test solution to the end point by utilizing an oxidimetry method; calculating the content of the nitric acid via the volume of the consumed standard titration solution. The method provided by the invention has strong practical application value, and is high in accuracy, simple and convenient to operate, and particularly suitable for on-line technical analysis.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, and more specifically relates to a method for measuring the content of nitric acid in a titanium plate pickling solution by using a redox titration method. Background technique [0002] Titanium and its alloys have high temperature resistance, light weight and high mechanical strength, and their corrosion resistance is stronger than steel. Therefore, they are widely used in aviation, aerospace, chemical, shipbuilding and other industrial sectors. rookie. The varieties of titanium materials mainly include hot-rolled and cold-rolled strips, welded pipes and rods and wires. The processing of titanium plate mainly includes: hot rolling, cold rolling, annealing, grinding, caustic blasting, pickling and other production processes. Pickling is a necessary and important process, and its main function is to effectively remove the deep stains and residual oxide film left after caustic blasting,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 郑小敏於利慧杨平吴建国
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP