Method for measuring phosphorus content in chromite

A determination method, the technology of chromite, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of wasting reagents and long process, and achieve the effect of stable results, simple method and strong operability

Active Publication Date: 2014-12-03
BLUESTAR LEHIGH ENG INST CO LTD
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  • Method for measuring phosphorus content in chromite
  • Method for measuring phosphorus content in chromite
  • Method for measuring phosphorus content in chromite

Examples

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Embodiment 1

[0022] Embodiment 1, a kind of content determination method of phosphorus in chromite ore, its steps are as follows:

[0023] (1) Weigh 0.2g of chromite sample, accurate to 0.0001g, place it in a corundum crucible, add 1.8g of sodium peroxide and mix well, then cover with 0.4g of sodium peroxide, place it in a muffle furnace at 700°C, and keep it for 3 minutes ;

[0024] (2) Take it out, put it in a beaker after cooling, add 80mL of hot water at 70°C to extract the melt, wash out the crucible, filter it with medium-speed filter paper, and wash the precipitate several times with sodium hydroxide solution; the mass concentration of sodium hydroxide is 18g / L;

[0025] (3) Acidify the precipitate with 10mL of 70°C hot hydrochloric acid solution, wash twice with 70°C hot water, and transfer to a volumetric flask; the volume ratio of hydrochloric acid to water in the hydrochloric acid solution is 1:0.8;

[0026] (4) Dispense 5mL of the test solution into a volumetric flask, add w...

Embodiment 2

[0029] Embodiment 2, a kind of content determination method of phosphorus in chromite ore, its steps are as follows:

[0030] (1) Weigh 0.5g of chromite sample, accurate to 0.0001g, place it in a corundum crucible, add 2.2g of sodium peroxide and mix well, then cover with 0.6g of sodium peroxide, place it in a muffle furnace at 750°C, and keep it for 5 minutes ;

[0031] (2) Take it out, put it in a beaker after cooling, add 120mL of 80°C hot water to extract the melt, wash out the crucible, filter it with medium-speed filter paper, and wash the precipitate several times with sodium hydroxide solution; the mass concentration of sodium hydroxide is 22g / L;

[0032] (3) Acidify the precipitate with 10mL of 80°C hot hydrochloric acid solution, wash with 80°C hot water three times, and transfer it to a volumetric flask; the volume ratio of hydrochloric acid to water in the hydrochloric acid solution is 1: 1.5;

[0033] (4) Dispense 20mL of the test solution into a volumetric fla...

Embodiment 3

[0036] Embodiment 3, a kind of content determination method of phosphorus in chromite ore, its steps are as follows:

[0037] (1) Weigh 0.2-0.5g of chromite sample, accurate to 0.0001g, place it in a 30mL corundum crucible, add 2g of sodium peroxide and mix well, then cover with 0.5g of sodium peroxide, and place in a muffle furnace at 720-730°C During, keep for 4min;

[0038] (2) Take it out, put it in a 250mL beaker after cooling, add 100mL of 75°C hot water to extract the melt, wash out the crucible, filter it with medium-speed filter paper, and wash the precipitate several times with sodium hydroxide solution; the mass concentration of sodium hydroxide is 20g / L;

[0039] (3) Acidify the precipitate with 10mL of hot hydrochloric acid solution at 75°C, wash with hot water for 3 times, and transfer to a 50mL volumetric flask; the hydrochloric acid is of AR grade, and the volume ratio is 1+1;

[0040] (4) Dispense 10mL of the test solution into a 50mL volumetric flask, add ...

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Abstract

The invention relates to a method for measuring phosphorus content in chromite. According to the method, a chromite sample is decomposed by high-temperature alkali fusion of sodium peroxide, the melt is extracted by hot water, phosphorus co-precipitates with elements such as iron, magnesium, manganese and the like, chromium enters the solution in a form of CrO4<2->, sodium hydroxide solution is used for washing so as to remove the chromium. The precipitate is subjected to acidolysis by hydrochloric acid and the precipitate subjected to acidolysis is then transferred into a volumetric flask. The test solution is separated, the pH value of the solution is adjusted by taking paranitrophenol as an indicator, phosphorus-molybdenum heteropoly acid is reduced to be phosphomolybdenum blue by taking ascorbic acid as a reducing agent in hydrochloric acid medium, and the light absorption value of the test solution is measured at the position of 680nm of a spectrophotometer. According to the technical scheme of the method, the design is reasonable, the relative standard deviation is less than 12%, and the recovery rate of standard addition reaches up to 96-99%; compared with the standard sample reference value, the method has the advantages that the analysis data is basically identical, the results are stable and accurate, simplicity and convenience are realized, and the operability is high.

Description

technical field [0001] The invention relates to a content determination method, in particular to a method for determining phosphorus content in chromite ore. Background technique [0002] The content of phosphorus in chromite is not high, which is one of the harmful elements. Phosphorus molybdenum blue photometry and phosphorus molybdenum yellow photometry are generally used for the determination of low phosphorus, but the sensitivity of phosphorus molybdenum yellow photometry is not as good as that of phosphorus molybdenum blue photometry, so phosphorus molybdenum blue photometry is commonly used. [0003] At present, in the commonly used method for determining the phosphorus content of chromite, the sample is generally dissolved with perchloric acid or acidified with perchloric acid after alkali melting, chromium is oxidized to high valence at high temperature, and hydrochloric acid is added several times and steamed to nearly dry to form chromium. Acid chlorides are vola...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 张晓梅陈奕岳秋张素芳郭凤云单连勇徐会会
Owner BLUESTAR LEHIGH ENG INST CO LTD
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