Method for determining alumina content in iron ore

A technology of alumina and iron ore, applied in the field of detection, can solve the problems of strict requirements, cumbersome operation, large influence, etc., and achieve the effects of low cost, time saving, high accuracy and tightness of results

Inactive Publication Date: 2013-05-15
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These solvents have a greater impact on the environment and analytical operators
The operation is cumbersome and demanding, and takes a long time

Method used

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  • Method for determining alumina content in iron ore
  • Method for determining alumina content in iron ore
  • Method for determining alumina content in iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First prepare the main reagents:

[0021] ① 0.02mol / L disodium ethylenediaminetetraacetic acid (EDTA) standard solution: Weigh 8g of AR grade disodium ethylenediaminetetraacetic acid and dissolve it in water, dilute to 1000mL with water, and mix well. Calibration shall be carried out according to GB / T601. ②0.02mol / L copper sulfate standard solution: Weigh 5g of AR-grade copper sulfate containing 5 crystal waters and dissolve it in water, add AR-grade sulfuric acid solution with a volume ratio concentration of 1mL1+4, dilute to 1000mL with water, and mix well; Execute according to GB / T601. ③Copper sulfate solution containing 5 crystal water: 20g / L, 25g / L, 30g / L; sodium fluoride solution: 30g / L, 40g / L, 50g / L; 1-(2-pyridylazo)- 2-naphthol indicator solution: 2g / L; phenylglycolic acid: 50g / L. ④Acetic acid-sodium acetate buffer solution with pH=4: Weigh 65g of AR grade sodium acetate containing 3 crystal waters, dissolve it in water, add 120mL of AR grade acetic acid, dil...

Embodiment 2

[0030] On the basis of the experimental method of embodiment 1,

[0031] Weigh about 0.3g of the sample, accurate to 0.0001g, and place it in a nickel crucible. Add 3g potassium hydroxide solvent and mix well. Put the nickel crucible in a high-temperature furnace from a low temperature to 750°C and keep it warm for 15 minutes, then take out the crucible and cool it down. Put it in a 250mL beaker, add 75mL of boiling water, and immediately cover the watch glass. After the molten material falls off, wash the crucible and cover with hot water and a small amount of nitric acid. Under constant stirring, immediately add 25mL nitric acid to acidify, heat and boil until clear. Cool the solution, transfer it into a 250mL volumetric flask, dilute with water to the mark, and shake well for later use. Draw 25mL of the test solution in the volumetric flask and place it in a 300mL beaker, add 10mL of phenylglycolic acid, stir well, put in a small piece of Congo red test paper, and neutra...

Embodiment 3

[0039] On the basis of the experimental method of embodiment 1,

[0040] Weigh about 0.4g sample, weighed to an accuracy of 0.0001g, and place it in a nickel crucible. Add 4g potassium hydroxide solvent and mix well. Put the nickel crucible in a high-temperature furnace from a low temperature to 800°C and keep it warm for 10 minutes, then take out the crucible and cool it down. Put it in a 250mL beaker, add 80mL of boiling water, and immediately cover the watch glass. After the melt falls off, wash the crucible and cover with hot water and a small amount of nitric acid. Under constant stirring, immediately add 30mL nitric acid for acidification, heat and boil until clear. Cool the solution, transfer it into a 250mL volumetric flask, dilute with water to the mark, and shake well for later use. Draw 30mL of the test solution in the volumetric flask and place it in a 300mL beaker, add 15mL of phenylglycolic acid, stir well, put in a small piece of Congo red test paper, and neu...

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Abstract

The invention relates to a detection method, in particular to a method for determining the alumina content in deposited iron briquette rock ore. The method includes: using potassium hydroxide as a fusing agent to fuse an iron ore sample in a high temperature furnace, conducting acidification by nitric acid, letting aluminum ions enter the solution, adding mandelic acid and excess ethylenediamine tetraacetic acid disodium salt (EDTA) standard solution to shelter titanium, iron, aluminum and other metal ions, and in an acetic acid-sodium acetate buffer solution with pH of 4, taking 1-(2-pyridylazo)-2-naphthol as an indicator, carrying out titration on the residual ethylenediamine tetraacetic acid disodium salt (EDTA) standard solution by means of a copper sulfate standard solution, adding a sodium fluoride solution to replace the ethylenediamine tetraacetic acid disodium salt (EDTA) standard solution cooperating with the aluminum ions, and then carrying out titration by a copper sulfate standard solution, thus obtaining the alumina content. The method provided in the invention has the characteristics of simplicity, rapidity, low cost and good repeatability, etc.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for measuring the alumina content in sedimentary iron block ore. Background technique [0002] Currently, hydrochloric acid, nitric acid, perchloric acid (or sulfuric acid) are often used as solvents for decomposing samples to determine the content of alumina in iron ore - fluorine salt instead of complex volumetric method. The filtrate is extracted with methyl isobutyl ketone to remove most of the iron, and then hexamethylenetetramine is used to precipitate aluminum, titanium and a small part of iron. In the presence of disodium ethylenediaminetetraacetic acid (EDTA), titanium, rare earth elements and a small part of iron are separated and removed by hydroxide to achieve the purpose of separating from aluminum. Then, the content of alumina was determined in the filtrate by adjusting the pH value and replacing the complexed aluminum with fluorine salt. These solvents have a greate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 冯晓军薛菁陈丹红王云华周玲芬华瑞娟胡莲珍陈晶亮姜威梅连平
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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