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Method for analyzing chromium in ore sample

An analysis method and technology for ore samples, applied in the measurement of color/spectral characteristics, etc., can solve the problems of cumbersome, time-consuming and unsuitable oxidation process, and achieve the effect of excellent special effect, shortened analysis time and good selectivity.

Active Publication Date: 2011-05-11
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The oxidation process of this method is cumbersome, especially for high-content chromium, it needs to add ammonium persulfate many times, which takes a long time, and the standard solution needs to be calibrated for each measurement, and there is interference of variable valence ions, such as arsenic, antimony, cerium, Vanadium, etc., not suitable for the determination of process samples

Method used

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  • Method for analyzing chromium in ore sample
  • Method for analyzing chromium in ore sample
  • Method for analyzing chromium in ore sample

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Weigh 0.1049g of sample into a nickel crucible containing 2g of potassium hydroxide, add a small amount of potassium nitrate, place in a muffle furnace and heat up to 750°C, melt for 20 minutes, take it out and put the nickel crucible into a 250ml beaker after cooling slightly , add 10ml of boiling water to extract the melt, and rinse the inner and outer walls of the crucible with boiling water, add 1ml of absolute ethanol, boil on an electric furnace for 10 minutes, transfer the solution to a 200ml volumetric flask after cooling, dilute to volume with water, and dry filter. Take 5.00ml of the filtrate, put it into a 100ml volumetric flask, dilute it with water to the mark, and carry out colorimetric measurement. The absorbance is 0.649, and the chromium content is 27.50%.

Embodiment 2

[0021] Weigh 0.1976g of sample into a nickel crucible containing 3g of potassium hydroxide, add a small amount of potassium nitrate, put it in a muffle furnace and melt it at 750°C for 20 minutes, take it out and put it into a 250ml beaker after cooling slightly, and add 10ml Extract the melt with boiling water, rinse the inner and outer walls of the crucible with boiling water, add 1ml of absolute ethanol, boil on an electric furnace for 10 minutes, transfer the solution to a 100ml volumetric flask after cooling, dilute to volume with water, and dry filter. Separately take 20.00ml of the filtrate, put it into a 100ml volumetric flask, dilute with water to the mark, and carry out colorimetric measurement. The absorbance is 0.524, and the chromium content is 1.46%.

Embodiment 3

[0023] Weigh 0.1896g of sample into a nickel crucible containing 2g of sodium peroxide, add a small amount of potassium nitrate, place in a muffle furnace and heat up to 700°C, melt for 15 minutes, take it out and put the nickel crucible into a 250ml beaker after cooling slightly , add 10ml of boiling water to extract the melt, add 1ml of absolute ethanol, boil on an electric furnace for 10 minutes, rinse the inner and outer walls of the crucible with boiling water, transfer the solution to a 100m1 volumetric flask after cooling, dilute to volume with water, and dry filter. Take 20.00ml of filtrate to a 100ml volumetric flask, dilute to the mark with water, and perform colorimetric measurement. The absorbance is 0.438, and the chromium content is 1.24%.

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Abstract

The invention relates to a method for analyzing chromium in an ore sample. The method comprises the following steps of: weighing a sample in a nickel crucible containing a solvent; adding an oxidant and putting in a muffle furnace for melting at certain temperature; taking the nickel crucible out, cooling for a moment and then putting the nickel crucible into a beaker; leaching out a fusant with boiling water and washing the inner wall and the outer wall of the nickel crucible; adding a proper quantity of absolute alcohol, and putting the absolute alcohol on an electric furnace for boiling; transferring the solution into a volumetric flask, and keeping a constant volume with water; carrying out dry filtering; and separately taking obtained filter liquid for colorimetric determination. The analyzing method has good selectivity, and after simple treatment, frequent ions do not have interference in the determination; and moreover, any other solvents are not added, thereby the analyzing time is greatly shortened. The method is more suitable for analyzing and measuring a flow sample, and an obtained result has good accuracy and precision.

Description

technical field [0001] The invention relates to an analysis method for chromium in an ore sample, in particular to an analysis method for colorimetrically measuring the chromium content in an ore sample by using the absorption spectrum of hexavalent chromium itself in an alkaline medium. Background technique [0002] There are many analytical methods for chromium (VI), mainly including electrochemical analysis, chemiluminescence, atomic absorption spectroscopy, ion chromatography and spectrophotometry. For the determination of chromium in ore samples, ferrous ammonium sulfate titration is generally used. After the sample is dissolved in phosphoric acid and sulfuric acid, silver nitrate is used as a catalyst to oxidize chromium (III) to chromium (VI) with ammonium persulfate. Then add a small amount of saturated sodium chloride solution, boil, and then titrate with a standard solution of ferrous ammonium sulfate. The oxidation process of this method is cumbersome, especially...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 屈伟宋永胜刘爽王正模
Owner 有研资源环境技术研究院(北京)有限公司
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