Method for measuring iron content in kaolin through using spectrophotometer

A spectrophotometer and kaolin technology, applied in the measurement of color/spectral properties, etc., can solve the problems of high performance requirements and complicated steps of microwave digestion instruments, and achieve the effects of low equipment cost, simple operation and small sample volume.

Inactive Publication Date: 2012-08-01
XIAMEN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Compared with the traditional decomposition method, this method has the same accuracy and precision, and has the advantages of simplicity, rapidity, and energy saving. However, due to the particularity of the kaolin sample, the maximum digestion pressure of the proposed method is 3.0 MPa, which is higher than that of general microwave acid. Digestion pressure, which requires higher performance of microwave digestion equipment
And the o-phenanthroline photometry that this document provides needs to add ascorbic acid solution, 1,10-o-phenanthroline solution, NH4Ac solution respectively in the sample liquid, and the step is more loaded down with trivial details

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  • Method for measuring iron content in kaolin through using spectrophotometer
  • Method for measuring iron content in kaolin through using spectrophotometer
  • Method for measuring iron content in kaolin through using spectrophotometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Zhangzhou iron-stained kaolin was used as the sample. Its main mineral composition is kaolinite and a small amount of quartz, and its mineral structure is flake and a large number of tubes.

[0042] 2) Weigh 0.500g of kaolin sample, place it in a silver crucible paved with 2g of sodium hydroxide, add a few drops of absolute ethanol to wet the sample, and then cover the sample with a layer of 2.5g of sodium hydroxide , plus a crucible lid. The crucible is calcined in a high-temperature energy-saving electric furnace. The heating rate is 5°C / min, the calcination temperature is 650°C, the calcination time is 10min, and it is taken out for cooling. Clean the outside of the crucible, put it together with the cover into a 250mL beaker, soak the frit with boiling water, wash the crucible and the crucible cover with hot water and a broom, and add 25mL of concentrated hydrochloric acid to dissolve all the precipitate under constant stirring. Cool to room temperature, trans...

Embodiment 2

[0046] The analysis and testing process is the same as in Example 1. The sample is bleached Zhangzhou iron dyed kaolin. When melting the sample, the heating rate is 7.5°C / min, the calcination temperature is 600°C, and the calcination time is 20min. The volume of the time-shifted sample solution is 5mL. When using a 3cm absorption dish, the absorbance of the measured sample solution is A=0.614, and the absorbance of the blank is A 0 =0.042, the calculated iron content in kaolin is 0.485%. When using a 1cm absorption dish, the absorbance of the measured sample solution is A=0.237, and the absorbance of the blank is A 0 =0.045, the calculated iron content in kaolin is 0.486%. The two are basically close to the iron content (0.50%) determined by the EDTA complexometric titration method in the national standard GB / T 14563-2008.

Embodiment 3

[0048] The analysis and testing process is the same as in Example 1. The sample is Zhangzhou iron-dyed kaolin calcined at 980°C. When melting the sample, the heating rate is 10°C / min, the calcination temperature is 625°C, and the calcination time is 15min. The volume of the time-shifted sample solution is 2mL. When using a 3cm absorption dish, the absorbance of the measured sample solution is A=0.392, and the absorbance of the blank is A 0 =0.042, the calculated iron content in kaolin is 0.742%. When using a 1cm absorption dish, the absorbance of the measured sample solution is A=0.163, and the absorbance of the blank is A 0 =0.045, the calculated iron content in kaolin is 0.747%. The two are basically close to the iron content (0.74%) determined by the EDTA complexometric titration method in the national standard GB / T 14563-2008.

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Abstract

The invention relates to a method for measuring iron content in inorganic mineral, particularly relates to a method for measuring iron content in kaolin through using a spectrophotometer, and the method is simple and convenient in operation, and rapid and accurate. The method comprises the following steps: melting a test sample with sodium hydroxide at a high temperature, and acidifying with hydrochloric acid to obtain a sample solution; placing ammonium ferrous sulfate hexahydrate in a beaker, adding hydrochloric acid and water, dissolving, placing into a volumetric flask, adding water to a constant volume to obtain a standard iron storage solution, and diluting to obtain a standard iron solution; transferring standard iron solutions of different volumes into a set of 50mL volumetric flasks, diluting with water to about 15mL, adding a mixed color development solution, adding water to a constant volume, transferring into an absorption vessel after 15min, measuring absorbance with a spectrophotometer at a wavelength of 510nm, and calculating the slope of a standard iron working curve; and measuring absorbance and blank absorbance of the sample solution, and then calculating the iron content in kaolin.

Description

technical field [0001] The invention relates to a method for measuring iron content in inorganic minerals, in particular to a method for measuring iron content in kaolin by using a spectrophotometer. Background technique [0002] Kaolin is a clay mineral raw material mainly composed of kaolinite minerals. It is widely used in Ceramics, paper, refractories, rubber, plastics, paints and other industries. Whether it is the ceramic industry or other industrial sectors, there are certain requirements for the whiteness of kaolin. Iron impurities in kaolin will not only reduce the natural whiteness of kaolin, but also affect its calcined whiteness, causing stains and melting scars on porcelain, reducing the industrial value of kaolin and hindering its application in ceramics and papermaking industries. Therefore, the quick, easy and accurate determination of iron content in kaolin is extremely important for guiding production and other scientific research. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 罗学涛傅翠梨李锦堂余德钦林彦旭卢成浩
Owner XIAMEN UNIV
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