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Method for determining iron content in silicon manganese alloy

The technology of a silicon-manganese alloy and a determination method, which is applied in the field of chemical testing, can solve the problems of incomplete dissolution of manganese-silicon alloy samples, affecting the judgment of the titration reaction speed, affecting the accurate determination of iron content, etc., so as to shorten the detection period and reduce the detection cost. , the method is reliable

Inactive Publication Date: 2019-02-22
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although GB / T8654.1-2007 has a method for the determination of iron content in silicon-manganese alloys, the method only directly reduces Fe with titanium trichloride. 3+ , itself transforms into Ti 4+ , while Ti 4+ Even in a strong acid medium, it is very easy to hydrolyze (generate -Ti-O-Ti-O- in the form of chain polymerization, that is, titanium acyl ion TiO 2+ ), producing a white colloidal hydrolyzate, which will affect the titration reaction speed and the judgment of the titration end point, thereby affecting the accurate determination of iron content
For the determination of iron content in other materials such as iron ore, melting decomposition titration is mostly used for the determination of refractory samples. The operation steps are cumbersome, the analysis time is long and it is difficult to meet the production needs; Mixed acid is dissolved, and the sodium fluoride solution-assisted titration method is used for determination, but this method is not completely dissolved for the manganese-silicon alloy sample, and the analysis result is obviously low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0059] 6. Preparation of potassium dichromate standard solution:

[0060] 6A, commercially available analytically pure 1.0g potassium dichromate is placed in a 500mL beaker;

[0061] 6B, according to the amount of 200mL / g potassium dichromate, add distilled water in the beaker of step 6A, dissolve completely;

[0062] 6C. Transfer the solution in step 6B into a 1000mL volumetric flask, dilute to 1000mL with water, and shake well to obtain a potassium dichromate standard solution of about 1.0 mg / mL;

[0063] Described nitric acid, hydrofluoric acid, hydrochloric acid, sulfuric acid, phosphoric acid are commercially available analytically pure products;

[0064] The utensils and instruments are common laboratory utensils and instruments.

Embodiment 1

[0066] 1. Dissolution of the sample

[0067] 1A. Add nitric acid in the amount of 75mL / g sample to 0.2000g silicon-manganese alloy sample to be tested (A) to obtain a sample solution;

[0068] 1B, in the sample solution obtained in step 1A, add hydrofluoric acid to obtain the sample solution by the amount of 1.5mL / g sample;

[0069] 1C. Dissolve the sample solution obtained in step 1B on a heating plate heated to 150-200°C at low temperature until most of the samples are completely dissolved to obtain the sample solution;

[0070] 1D. In the sample solution obtained in step 1C, add sulfur-phosphorus mixed acid in an amount of 75mL / g sample to obtain a sample solution, wherein the sulfur-phosphorus mixed acid is the following volume ratio H 2 SO 4 : H 3 PO 4 : H 2 O=20:15:65;

[0071] 1E. Put the sample solution obtained in step 1D on the electric heating plate heated to 300-350°C to continue to dissolve completely, evaporate and smoke to the bottle mouth, remove it, and ...

Embodiment 2

[0091] A method for assaying iron content in silicon-manganese alloys, the steps are as follows:

[0092] Step 1. Dissolution of the sample

[0093] A, in the silicon-manganese alloy sample to be tested, add nitric acid according to the amount of 50mL / g sample, to obtain the sample solution;

[0094] B, in the sample solution obtained in step A, add hydrofluoric acid to obtain the sample solution by the amount of 1mL / g sample;

[0095] C. Dissolve the sample solution obtained in step B on an electric heating plate heated to 150°C at low temperature until most of the samples are completely dissolved to obtain the sample solution;

[0096] D. In the sample solution obtained in step C, add sulfur-phosphorus mixed acid in an amount of 50mL / g sample to obtain a sample solution, wherein the sulfur-phosphorus mixed acid is the following volume ratio H 2 SO 4 : H 3 PO 4 : H 2 O=20:15:65;

[0097] E. Put the sample solution obtained in step D on the electric heating plate heated...

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PUM

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Abstract

The invention discloses a method for determining iron content in a silicon manganese alloy. The method comprises the following steps: dissolving, titrating, determining titer, calculating the sample content and the like. By virtue of the technological means comprising the steps of adding nitric acid and hydrofluoric acid to heat and dissolve, adding a sulfuric phosphoric acid mixture to continuously heat and dissolve, adding stannous chloride and distilled water to reduce and then titrating, the condition that the titration reaction rate and titration end point are influenced because Ti<4+> ishydrolyzed to produce a white colloidal hydrolysis product is avoided on the premise of fully dissolving the silicon manganese alloy and fully reducing the Fe<3+>, the operating steps are simplified,the analysis time is shortened, the detection cost is reduced, the iron content determination accuracy is improved, and the method has important application value.

Description

technical field [0001] The invention belongs to the technical field of chemical testing, and in particular relates to a method for measuring iron content in silicon-manganese alloys. Background technique [0002] Ferroalloy is a product that is added to molten iron as a deoxidizer, element additive, etc. during steelmaking to make steel have certain characteristics or meet certain requirements. Ferroalloys are generally used as: deoxidizer: to remove oxygen from molten steel during the steelmaking process, some ferroalloys can also remove other impurities in steel such as sulfur, nitrogen, etc.; alloy additives: add alloy elements according to the composition requirements of steel types Into the steel to improve the performance of the steel; inoculant: added to the molten iron before casting the cast iron to improve the crystallization structure of the casting. Silicon-manganese alloys are widely used as alloy additives in the steelmaking process. The main components of sil...

Claims

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Application Information

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IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 曾海梅章祝雄苏宁欧阳光
Owner WUKUN STEEL