Method for determining content of calcium fluoride and calcium carbonate in fluorite by EDTA complexometric titration method

Abstract

The invention discloses a method for determining the content of calcium fluoride and calcium carbonate in fluorite through an EDTA complexometric titration method, and relates to the technical field of fluorite determination through the EDTA complexometric titration method. The method for determining the content of calcium fluoride and calcium carbonate in fluorite through the EDTA complexometrictitration method comprises the following steps: S1, determining the moisture content in fluorite through the EDTA complexometric titration method; S2, determining the content of calcium fluoride in fluorite by the EDTA complexometric titration method; and S3, determining the content of calcium carbonate in fluorite by the EDTA complexometric titration method. According to the method for determining the content of calcium fluoride and calcium carbonate in fluorite through the EDTA complexometric titration method, the EDTA complexometric titration method is small in error of calcium fluoride andcalcium carbonate, high in end point resolution during titration and suitable for accurate determination of calcium fluoride and calcium carbonate in fluorite concentrate, and the error of a calciumfluoride result determined through the method can be controlled to be + / -0.3%; the determination process is relatively shortened, and the consumed time is about 3 hours; and the result reproducibilityis good, and the resolution is high.

Description

technical field [0001] The present invention relates to EDTA complexometric titration method to measure fluorite technical field, be specifically a kind of EDTA complexometric titration method to measure calcium fluoride and calcium carbonate content method in fluorite. Background technique [0002] Existing EDTA titration method for determining calcium fluoride: [0003] The sample is leached with dilute acetic acid, filtered, precipitated, treated with neutral aluminum chloride solution, and then in the presence of sucrose, adjust the pH value of the solution, add masking agent triethanolamine, L-cysteine ​​amino acid, and use calcium reagent as an indicator agent, titrated with EDTA standard solution. [0004] Its main operation steps are: [0005] 1. Melting sample: Weigh 0.2500g of sample into a 100ml beaker, add 8ml of 100g / l acetic acid solution, cover with a watch glass, heat on a water bath at 90-95°C for 30min, and shake. Cool and filter through slow filter pape...

AI Technical Summary

Problems solved by technology

[0027] Aiming at the deficiencies in the prior art, the present invention provides a method for determining the content of calcium fluoride and calcium carbonate in fluorite by EDTA complexometric titration, which solves the above-mentioned background technology and proposes that the titration solution of this method should be titrated immediately after adding alkali. , long-term storage will form insoluble calcium aluminate precipitates, resulting in low results; when calcium fluoride is converted with aluminum trichloride solution, the conversion speed is slow, resulting in a long analysis process, which requires 2 boiling water baths, which is time-consuming 6 hours; adding a correction value of 0.4% to the calculation is unscientific; the result has a large deviation, especially the high content of calcium fluoride (above 80%), and the error of the sample result in actual operation is between ± 2%, and cannot The problem of meeting the needs of both suppliers and buyers for economic settlement

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