Method for quickly analyzing total iron in iron ore

A rapid analysis, iron ore technology, applied in the direction of material analysis by observing the effect of chemical indicators, and analysis by chemical reaction of the material, etc., can solve the observation and matching of the end point from purple to bright yellow. The problem of slow response speed, high measurement results, etc., achieves the effect of easy observation, good accuracy and precision, and improved operating conditions

Inactive Publication Date: 2015-04-29
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the temperature of the test solution during titration by this method needs to be controlled at 50-70°C. When the temperature is higher than 75°C, the aluminum (III) ions in the test solution will complex with EDTA, so that the use of potassium acid will still damage human health and cause serious harm. seriously pollute the environment
Therefore, the mercury-free and chromium-free method has become a

Method used

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  • Method for quickly analyzing total iron in iron ore
  • Method for quickly analyzing total iron in iron ore
  • Method for quickly analyzing total iron in iron ore

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of reagents

[0035] Reagents used in this and the following examples include:

[0036] (1) Ammonia solution: a solution of ammonia and water in a volume ratio of 1:1;

[0037] (2) Nitric acid solution: a solution prepared with concentrated nitric acid and water at a volume ratio of 1:1;

[0038] (3) Sulfosalicylic acid indicator: 20% aqueous solution of sulfosalicylic acid;

[0039] (4) Xylenol orange indicator: an aqueous solution with a mass concentration of xylenol orange of 0.5%;

[0040] (5) EDTA standard solution: EDTA concentration is 0.0300mol / L;

[0041] (6) Bismuth nitrate standard solution: the concentration of bismuth nitrate is 0.0300mol / L.

[0042] (2) Analysis steps

[0043] Weigh 0.1656g of iron ore sample into a glass beaker, decompose the sample with a mixed acid consisting of 20mL of concentrated hydrochloric acid, 10mL of concentrated nitric acid and 5mL of concentrated sulfuric acid. After the fumes of sulfuric acid are exhaust...

Embodiment 2

[0047] Weigh 0.2878g of iron ore sample into a glass beaker, decompose the sample with a mixed acid consisting of 20mL of concentrated hydrochloric acid, 10mL of concentrated nitric acid and 5mL of concentrated sulfuric acid. Transfer to a 100mL volumetric flask, add water to make up to 100mL. Dispense 25.00 mL of the test solution into a glass beaker, add ammonia solution dropwise until ferric hydroxide precipitates, add nitric acid solution dropwise until the ferric hydroxide precipitate dissolves, add 1 mL in excess, and dilute with water to 100 mL. Add 5 drops of sulfosalicylic acid indicator solution with a mass concentration of 20%, drip with 0.0300mol / LEDTA standard solution at room temperature until the red color disappears, and then excess 3-5mL to consume a total of 20.00mL of EDTA standard solution. Add 3 drops of xylenol orange indicator solution with a mass concentration of 0.5%, and use 0.0300mol / L bismuth nitrate standard solution to drop from yellow to orange r...

Embodiment 3

[0049] Weigh 0.2697g of iron ore sample in a glass beaker, decompose the sample with a mixed acid consisting of 20mL of concentrated hydrochloric acid, 10mL of concentrated nitric acid and 5mL of concentrated sulfuric acid. Transfer to a 100mL volumetric flask and add water to make up to 100mL. Dispense 25.00 mL of the test solution into a glass beaker, add ammonia solution dropwise until ferric hydroxide precipitates, add nitric acid solution dropwise until the ferric hydroxide precipitate dissolves, add 1 mL in excess, and dilute with water to 100 mL. Add 5 drops of sulfosalicylic acid indicator solution with a mass concentration of 20%, drip with 0.0300mol / L EDTA standard solution at room temperature until the red color disappears, and then excess 3-5mL to consume a total of 25.00mL of EDTA standard solution. Add 3 drops of xylenol orange indicator solution with a mass concentration of 0.5%, use 0.0300mol / L bismuth nitrate standard solution to drop from yellow to orange red, ...

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Abstract

The invention provides a method for quickly analyzing total iron in iron ore. The method comprises steps as follows: adding a mixed acid consisting of concentrated hydrochloric acid, concentrated nitric acid and concentrated sulfuric acid to an iron ore sample to decompose the sample, adding water for boiling until no sulfuric acid smoke exists, and cooling to the room temperature; dropwise adding an ammonia water solution until ferric hydroxide precipitates, then dropwise adding an excessive nitric acid solution until all ferric hydroxide precipitates are dissolved, then diluting the solution with water, and adjusting the pH value to range from 1 to 2; adding a sulphosalicylic acid solution, performing even mixing, dropwise adding an excessive EDTA (ethylene diamine tetraacetic acid) standard solution at the room temperature until the red color disappears, and recording the dosage of the EDTA standard solution; continuously adding a xylenol orange solution to the sample solution, dropwise adding a bismuth nitrate standard solution until the solution turns orange red from yellow, and recording the dosage of the bismuth nitrate standard solution. According to the method, the content of the total iron in the iron ore is determined by back titrating the excessive EDTA standard solution in the solution with the bismuth nitrate standard solution at the normal temperature, and the obtained result has high accuracy and precision.

Description

technical field [0001] The present invention relates to a kind of rapid analysis method of total iron in iron ore, specifically, relate to a kind of application Bi(NO 3 ) 3 - EDTA back titration method for the determination of total iron in iron ore. Background technique [0002] The content of total iron in iron ore is generally more than 10%, and the standard method uses titanium trichloride to reduce potassium dichromate titration (mercury-free method). with classical SnCl 2 -HgCl 2 -K 2 Cr 2 o 7 Compared with the mercury method (mercury method), although the highly toxic reagent mercuric chloride is replaced by titanium trichloride, the use of potassium dichromate will still damage human health and seriously pollute the environment. Therefore, the mercury-free and chromium-free method has become the main trend for the determination of iron in iron ore. At present, the EDTA complexometric titration method is mostly used. compound (lgK FeY -=25.1), using sulfosali...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 屈伟周成英
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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