Method for continuously determining calcium content and iron content in limestone powder

A technology for limestone powder and iron content, which is applied in the field of analytical chemistry, can solve the problems of high price of instruments, cumbersome procedures, and cannot meet the needs of daily analysis, and achieves the effects of meeting the needs of daily analysis, accurate and reliable results, and simple and practical methods.

Inactive Publication Date: 2015-11-18
JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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Problems solved by technology

For the determination of calcium and iron, due to the cumbersome procedures of the classic chemical method
The content of Fe and Al in bauxite is measured by X-ray fluorescence spectrometer. Although the analysis result is accurate and the sensitivity is high, the instrument is expensive and cannot meet the needs of daily analysis.

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  • Method for continuously determining calcium content and iron content in limestone powder
  • Method for continuously determining calcium content and iron content in limestone powder
  • Method for continuously determining calcium content and iron content in limestone powder

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Embodiment Construction

[0026] In the following, the present invention will be further explained in conjunction with the embodiments.

[0027] The purity of the reagents used in the following examples is analytically pure, the water used is double distilled water, and the relevant solutions are prepared as follows:

[0028] 0.01mol / L EDTA standard solution: Weigh 3.8g disodium ethylenediaminetetraacetate on an analytical balance, dissolve it in 100mL deionized water, dissolve it by heat, transfer to a 500mL reagent bottle, and add 400mL deionized water , Shake well. If there is turbidity, it should be filtered. Take CaCO 3 Standardize the EDTA solution for the benchmark.

[0029] 0.03mol / L CuSO4 standard solution: 7.5g copper sulfate (CuSO 4 ·5H2O) dissolve in water, add 0.8mL sulfuric acid, transfer to 1L lower mouth bottle, dilute with water to 1L, shake well. Standardized with 0.01mol / L EDTA standard solution.

[0030] Acetic acid-ammonium acetate buffer (pH 4.5): Take 7.7 g of ammonium acetate, add 50...

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Abstract

The present invention discloses a method for continuously determining the calcium content and the iron content in limestone powder. The method mainly comprises: separating impurities, determining iron in the filtrate by using an atomic absorption spectrometry method, adding excess EDTA, carrying out back titration on calcium in the filtrate with a CuSO4 standard solution, and finally respectively calculating the calcium content and the iron content in the sample. Compared with the method in the prior art, the method of the present invention has characteristics of simpleness, practicality and accurate and reliable result, and can meet the needs of daily analysis.

Description

Technical field [0001] The invention belongs to the field of analytical chemistry, and specifically relates to a method for continuously determining the content of calcium and iron in limestone powder. Background technique [0002] Limestone powder is an important raw material for electric porcelain glaze, its composition is relatively simple, mainly containing calcium oxide, Fe 2 O 3 It is its harmful impurities. The iron content affects its color, strength and other properties. Therefore, its content must be accurately measured before the electric porcelain is mixed. For the determination of calcium and iron, the procedures of classical chemical methods are too complicated. X fluorescence spectrometer is used to determine the content of Fe and Al in alumina. Although the analysis results are accurate and sensitive, the price of the instrument is relatively high, which cannot meet the needs of daily analysis. [0003] At present, calcium can be determined by EDTA complexometric t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31
Inventor 张超杨志峰王士维王根水谢从珍刘少华
Owner JIANGSU SOUTH PORCELAIN INSULATOR CO LTD
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