Method for measuring content of silicon dioxide in iron ores

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

Inactive Publication Date: 2013-05-22
YUNNAN PHOSPHATE CHEM GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operation is cumbersome and

Method used

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  • Method for measuring content of silicon dioxide in iron ores
  • Method for measuring content of silicon dioxide in iron ores
  • Method for measuring content of silicon dioxide in iron ores

Examples

Experimental program
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Embodiment 1

[0017] First prepare the main reagents:

[0018] 0.1mol / L sodium hydroxide standard titration solution: Weigh 110g of AR-grade sodium hydroxide, dissolve it in 100 mL of carbon dioxide-free water, shake well, pour into a polyethylene container, and place it airtight until the solution is clear. Measure 5.4 mL supernatant with a plastic tube, dilute to 1000 mL with carbon dioxide-free water, and mix well. Calibration shall be carried out according to GB / T601.

[0019] Next is to test:

[0020] Weigh about 0.15g of the sample, weighed to an accuracy of 0.0001g, and place it in a 250mL polytetrafluoroethylene beaker. Add 10 mL of nitric acid and 20 mL of hydrofluoric acid, and mix well. Cover the polytetrafluoroethylene watch glass, place the polytetrafluoroethylene beaker on the electric heating plate from low temperature to 180 °C, keep the temperature gently and heat it, shake it every 5 minutes, boil for 20 minutes, control the remaining volume to 10mL and remove it. Afte...

Embodiment 2

[0026] On the basis of the experimental method of embodiment 1,

[0027] Weigh about 0.18g of the sample, weighed to an accuracy of 0.0001g, and place it in a 250mL polytetrafluoroethylene beaker. Add 11 mL of nitric acid and 22 mL of hydrofluoric acid, and mix well. Cover the polytetrafluoroethylene watch glass, put the polytetrafluoroethylene beaker on the electric heating plate and raise it from low temperature to 190 °C, keep the temperature and heat gently, shake once every 5 minutes, slightly boil for 25 minutes, control the remaining volume to 10mL and remove it. After adding 10mL of hydrochloric acid-nitric acid mixed acid, add 2.5g of solid potassium chloride, stir carefully until saturated, and a small amount of solid potassium chloride remains undissolved. Slowly add 9mL potassium fluoride solution under stirring, continue to stir for 1 min, put it in an ice-cold container to cool down rapidly, and place it for about 25 min. Under constant stirring, slowly pour in...

Embodiment 3

[0034] On the basis of the experimental method of embodiment 1,

[0035]Weigh about 0.20g of the sample, weighed to an accuracy of 0.0001g, and place it in a 250mL polytetrafluoroethylene beaker. Add 12 mL of nitric acid and 25 mL of hydrofluoric acid, and mix well. Cover the polytetrafluoroethylene watch glass, place the polytetrafluoroethylene beaker on the electric heating plate from low temperature to 200 °C, keep the temperature gently and heat it, shake it every 5 minutes, boil for 30 minutes, control the remaining volume to 10mL, and then remove it. After adding 10mL of hydrochloric acid-nitric acid mixed acid, add 3g of solid potassium chloride, stir carefully until saturated, and a small amount of solid potassium chloride remains undissolved. Slowly add 10mL of potassium fluoride solution under stirring, continue to stir for 1 min, put it in an ice-cold container to cool down rapidly, and place it for about 30 min. Under constant stirring, slowly pour into a polyeth...

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Abstract

The invention discloses a method for measuring content of silicon dioxide in iron ores, relates to a detecting method and in particular relates to the method for measuring content of silicon dioxide in iron ores. The method comprises the following steps of: decomposing the silicon dioxide iron ore samples at certain temperature by adopting hydrofluoric acid-nitric acid; controlling the volume of the test solution to form a ternary constant-boiling system of fluosilicic acid, hydrofluoric acid and water; adding potassium chloride and potassium fluoride in hydrochloric acid-nitric acid mixture medium, so that silicic acid is precipitated out in the form of potassium fluosilicate large crystals; removing free acid by filtering and washing the precipitates, generating hydrofluoric acid by hydrolysis adopting boiling water, and using bromothymol blue-phenol red as an indictor and using sodium hydroxide standard titration solution to titrate so as to obtain the content of the silicon dioxide in the iron cores. The method has the characteristics of being simple, quick, low in cost, good in reproducibility and the like.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for measuring the silicon dioxide content in sedimentary iron block ore. Background technique [0002] At present, the silicon dioxide content in iron ore is determined by silicon molybdenum blue spectrophotometry. The decomposed sample is melted with sodium carbonate-boric acid mixed solvent, and leached with dilute sulfuric acid. Under the acidity of 0.20 mol / L~0.25 mol / L, make silicic acid and ammonium molybdate form yellow silicon molybdenum heteropoly acid, then add oxalic acid to remove phosphorus and arsenic interference, and use ferrous ammonium sulfate to reduce silicon molybdenum heteropoly acid It is silicon molybdenum blue, and the absorbance is measured at a wavelength of 760nm to determine the content of silicon dioxide. The operation is cumbersome and demanding, and takes a long time. Contents of the invention [0003] The purpose of the invention is to overcome t...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 冯晓军薛菁
Owner YUNNAN PHOSPHATE CHEM GROUP CORP
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