Method for measuring content of magnesium oxide in iron ores

A magnesia and iron ore technology, applied in the field of detection, can solve the problems of cumbersome operation, strict requirements, long time consumption, etc., and achieve the effects of low cost, high accuracy and precision, and high accuracy and tightness of results.

Active Publication Date: 2012-08-15
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These solvents have a greater impact on the environment and analytica...

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  • Method for measuring content of magnesium oxide in iron ores
  • Method for measuring content of magnesium oxide in iron ores
  • Method for measuring content of magnesium oxide in iron ores

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0019] First prepare the main reagents:

[0020] 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. ②Sodium hydroxide solution: 200g / L, 20g / L; ethylene glycol diethyl ether diammonium tetraacetic acid (EGTA) solution: 70g / L; phenylglycolic acid solution: 50g / L; triethanolamine solution: 1+1, 1 +4; hydrochloric acid solution: 1+9; ammonia solution: 2+3. ③Acid chrome blue K-naphthol green B indicator: Weigh 0.1g of AR grade acid chrome blue K, weigh 0.1g of AR grade naphthol green B, weigh 20g of AR grade chlorine Potassium chloride is placed in a mortar, thoroughly ground and mixed. ④ pH=10 ammonia water-ammonium chloride buffer solution: Weigh 67.5g of AR grade ammonium chloride, dissolve it in water, add 570mL of AR grade ammonia water, dilute to 1000 mL with wat...

Embodiment 2

[0029] On the basis of the experimental method of embodiment 1,

[0030] Weigh about 0.5g sample, weighed to an accuracy of 0.0001g, and place it in a nickel crucible. Add 5 g of sodium 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, add 12mL of ethylene glycol diethyl ether diammo...

Embodiment 3

[0038] On the basis of the experimental method of embodiment 1,

[0039] Weigh about 0.6g sample, weighed to an accuracy of 0.0001g, and place it in a nickel crucible. Add 6 g of sodium 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, add 14mL of ethylene glycol diethyl ether diammonium...

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Abstract

The invention discloses a method for measuring the content of magnesium oxide in iron ores, relates to a detection method, and particularly relates to a method for measuring the content of magnesium oxide in depositing iron rocks and ores. The method includes adopting sodium hydroxide as a fusing agent to melt an iron ore sample in a high-temperature furnace and leading magnesium ions to enter solution after acidification by aid of nitric acid; and adding benzilic acid, ethylene glycol tetraacetic acid (EGTA) solution and triethanolamine to mask metal ions of titanium, iron, aluminum, alkaline earth and the like, generating magnesium hydroxide deposit in alkaline solution with the pH (potential of hydrogen) larger than 12, depositing to generate hydrochloric acid solute after filtering, using acid chrome blue K and naphthol green B as indicators in solution with the pH of 10, adopting ethylene diamine tetraacetic acid (EDTA) standard solution for titration, and obtaining the content of the magnesium oxide. The method has the advantages of simplicity, convenience, speediness, low cost, fine reproducibility and the like.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for determining the content of magnesium oxide in sedimentary iron block rock ore. Background technique [0002] At present, the content of magnesium oxide in iron ore is determined by the complexometric titration method, and the decomposition samples are mostly melted and decomposed by sodium peroxide-sodium hydroxide. Leach with triethanolamine and ethylene glycol diethyl ether diammonium tetraacetic acid (EGTA). Filtration, magnesium is precipitated in the form of magnesium hydroxide and other coexisting alkaline earth metals and interfering elements such as iron, manganese, aluminum, silicon, phosphorus, sulfur, fluorine and non-ferrous metals are separated; ammonium hydroxide is used to separate rare earth and titanium; copper reagent- Chloroform extraction and separation of residual iron, manganese and other non-ferrous metal elements. Using chrome black T as indicator, titr...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22
Inventor 冯晓军薛菁陈丹红周玲芬卢美莲李翠华胡莲珍陈晶亮姜威梅连平
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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