Determination method of phosphorus content in ferroniobium

A method for measuring phosphorus content, which is applied in the field of chemical analysis of niobium-containing ferroalloys, can solve problems such as cumbersome operation of the method, and achieve the effect of simple operation

Active Publication Date: 2016-11-23
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Need to separate twice, the method is cumbersome

Method used

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  • Determination method of phosphorus content in ferroniobium
  • Determination method of phosphorus content in ferroniobium

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Embodiment Construction

[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 phosphorus content in ferroniobium. The method comprises: melting and cooling anhydrous sodium carbonate, sodium peroxide and ferroniobium; adding perchloric acid, leaching, then heating and boiling until the black turbid solution turns into a green turbid solution; adding sodium hydroxide solution, heating to Boiling to obtain the mother liquor; add perchloric acid to the mother liquor, add bismuth salt solution, sodium thiosulfate solution and ammonium molybdate mixture, so that the phosphorus in the mother liquor reacts with bismuth ions and ammonium molybdate in the perchloric acid medium to form Phosphorous bismuth molybdenum heteropolyacid complex, wherein the bismuth salt solution is obtained by dissolving the bismuth salt with perchloric acid and heating to emit perchloric acid fumes, and the ammonium molybdate mixture is made of perchloric acid, ammonium molybdate and gum arabic The solution formed; adding ascorbic acid for reduction to obtain a test solution containing bismuth phosphomolybdenum blue; measuring the absorbance of the bismuth phosphomolybdenum blue in the test solution by photometry, and calculating the phosphorus content. The operation of the invention is relatively simple; and the phosphorus content in ferroniobium can be accurately determined.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 杨道兴
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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