Method for determining content of phosphorus in ferroniobium

A determination method and technology for phosphorus content are applied in the field of chemical analysis of niobium-containing ferroalloys, which can solve the problems of cumbersome operation of the method and achieve the effect of simple operation.

Active Publication Date: 2014-10-29
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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Problems solved by technology

Need to separate twice,

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  • Method for determining content of phosphorus in ferroniobium
  • Method for determining content of phosphorus in ferroniobium

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[0009] Hereinafter, the method for determining the phosphorus content in ferroniobium of the present invention will be described in detail in combination with exemplary embodiments.

[0010] In the present invention, preferably, the ferroniobium to be tested contains not more than 0.5% phosphorus by mass percentage.

[0011] In an exemplary embodiment of the present invention, the assay method of phosphorus content in ferro-niobium comprises the following steps of carrying out in order:

[0012] Anhydrous sodium carbonate, sodium peroxide and ferroniobium are mixed, heated to obtain a melt, that is, an alkali melt of ferroniobium, and then cooled. For example, before weighing the sample, add a small amount of anhydrous sodium carbonate first, the purpose is to allow the sample to fully mix with sodium peroxide when mixing after adding sodium peroxide, and add some peroxide before weighing the sample. Sodium, do not add anhydrous sodium carbonate, but when weighing the sample,...

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Abstract

The invention provides a method for determining the content of phosphorus in ferroniobium. The method comprises the steps of melting anhydrous sodium carbonate, sodium peroxide and ferrocolumbium, cooling, adding perchloric acid, leaching, heating and boiling until a black muddy solution is changed to a green muddy solution; adding a sodium hydroxide solution and heating until boiling to obtain a mother solution; adding perchloric acid in the mother solution, adding a bismuth salt solution, a sodium thiosulfate solution and an ammonium molybdate mixed solution to enable the phosphorus in the mother liquid, bismuth ions and ammonium molybdate to react in a perchloric acid medium to generate phosphorus-bismuth-molybdenum heteropolyacid, wherein bismuth salt is dissolved in the perchloric acid and the solution is heated until dense perchloric acid smoke occurs, and therefore, the bismuth salt solution is obtained, and the ammonium molybdate mixed liquid is prepared from perchloric acid, ammonium molybdate and arabic gum; adding ascorbic acid to perform reduction reaction to obtain bismuth phosphomolybdenum blue containing a solution to be tested; and measuring the absorbancy of the bismuth phosphomolybdenum blue in the solution to be tested by adopting a spectrophotometric method and calculating the content of the phosphorus. The method is convenient to operate and can accurately determine the content of the phosphorus in the ferroniobium.

Description

technical field [0001] The invention relates to the technical field of chemical analysis of niobium-containing ferroalloys, in particular to a method capable of measuring phosphorus content in niobium-containing ferroalloys (abbreviated as ferroniobium). Background technique [0002] The bismuth-phosphorus-molybdenum blue photometric method for determining the phosphorus content in ferroniobium in the existing national standard uses sodium peroxide to melt the sample, leaches and filters with saturated sodium chloride solution, separates niobium, and then uses iron solution to precipitate phosphorus and chloride Phosphorus content was determined by molybdenum blue photometry after sodium separation. It needs to be separated twice, and the method is cumbersome to operate. [0003] Therefore, it is necessary to invent a bismuth-phosphorus-molybdenum blue-blue photometric method that is easier to operate and can accurately determine the phosphorus content in ferroniobium. Co...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 杨道兴
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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