Method for determining phosphorus in silicon-manganese alloy

A measurement method, silicon-manganese alloy technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc. It can solve the problems of unstable analysis results, poor stability, and long analysis time, etc. question

Inactive Publication Date: 2012-07-04
吉林建龙钢铁有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The phosphorus determination method reported in the prior art uses ascorbic acid as a reducing agent, and it needs to wait for 10 minutes to be stable after color development a...

Method used

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  • Method for determining phosphorus in silicon-manganese alloy
  • Method for determining phosphorus in silicon-manganese alloy
  • Method for determining phosphorus in silicon-manganese alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 0.0600 g of No. 1 silicon-manganese alloy sample and place it in a 150 ml polytetrafluoroethylene beaker, add 10 ml of nitric acid, drop 5 ml of hydrofluoric acid to dissolve, add 5 ml of perchloric acid, heat and smoke to condense to 2 ml, and obtain the first mixture solution, the No. 1 silicon-manganese alloy sample is GSB03-1947-2005 standard sample, and the P content is 0.078wt%;

[0044] Remove the first mixed solution and cool it slightly, add 10ml of distilled water with a temperature of 60-70°C, rinse the beaker wall with distilled water, heat, add anhydrous sodium sulfite dropwise to reduce manganese, boil until the solution is clear, cool to room temperature, turn to into a 100ml volumetric flask, diluted to the mark, and shaken to obtain the second mixed solution;

[0045] Accurately pipette 10.00ml of the second mixed solution in a 50ml volumetric flask, add 5ml of bismuth nitrate solution configured by nitric acid solution, the nitric acid solution i...

Embodiment 2～4

[0050] Get respectively No. 2 silicon-manganese alloy sample, No. 3 silicon-manganese alloy sample and No. 4 silicon-manganese alloy sample, adopt the method of embodiment 1 to carry out 6 parallel measurements to the phosphorus content in the silicon-manganese alloy, the results are shown in Table 1 shown. No. 1 silicon manganese alloy sample is GSB03-1947-2005 standard sample, P content is 0.078wt%; No. 2 silicon manganese alloy sample is GSB03-1359-2001 standard sample, P content is 0.104wt%; The silicon-manganese alloy sample is the standard sample No. 09-100, and the P content is 0.137wt%; the No. 4 silicon-manganese alloy sample is the standard sample YSBC37645-02, and the P content is 0.178wt%.

[0051] The phosphorus content in the silicon-manganese alloy that table 1 embodiment 1~4 measures

[0052]

[0053]

[0054] Analysis of the above results: According to the "Procedures for Ensuring the Quality of Test Results": Regularly use certified standard materials ...

Embodiment 5～7

[0066] Get respectively No. 2 silicon-manganese alloy sample, No. 3 silicon-manganese alloy sample, No. 4 silicon-manganese alloy sample, adopt the method of embodiment 1 to measure the phosphorus content in each silicon-manganese alloy sample, each sample The measurements were performed twice, and the results are shown in Table 4.

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Abstract

The invention discloses a method for determining phosphorus in silicon-manganese alloy, which comprises the steps of: dissolving a test sample by using nitric acid and hydrofluoric acid and adding perchloric acid to convert phosphorus in the test sample into orthophosphoric acid to obtain fist mixed solution; adding sodium sulfite into the first mixed solution to reduce manganese in the silicon-manganese alloy to obtain second mixed solution; and adding bismuth nitrate solution, ammonium molybdate solution, potassium sodium tartrate solution, sodium fluoride and stannous chloride into the second mixed solution, wherein ammonium molybdate can convert the orthophosphoric acid in the first mixed solution into phosphorus-molybdenum heteropoly acid, using stannous chloride to reduce the formed phosphorus-molybdenum heteropoly acid into blue phosphomolybdenum blue and finally using a spectrophotometric method to determine the content of the phosphorus. Compared with the prior art, by using the stannous chloride as the reducing agent, since the stannous chloride has the characteristics of high reducing speed, good reducing effect and the like, the analysis time of the determination method is shorter, the accuracy and the stability of the determination result are improved and the method is suitable for field mass production analysis.

Description

technical field [0001] The invention relates to the technical field of silicon-manganese alloys, in particular to a method for determining phosphorus in silicon-manganese alloys. Background technique [0002] Silicon-manganese alloy is an alloy composed of manganese, silicon, iron, carbon and other elements. It is the main raw material for smelting alloy steel and low alloy steel. Its quality directly affects the quality of steel and the machining performance of steel. Phosphorus, an impurity element in manganese-silicon alloy, is a harmful element that will cause cold and brittle steel. Therefore, the determination of phosphorus content in manganese-silicon alloy is of great significance for guiding steelmaking production. Furthermore, since the performance of silicon-manganese alloys with a phosphorus content greater than 0.25% will be significantly reduced, the accuracy of the phosphorus content measurement results is also of great significance. [0003] There are nation...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 杨春艳
Owner 吉林建龙钢铁有限责任公司
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