Device and method for measuring fluorine content in metallurgical slag melting agent

Abstract

The invention discloses a device for measuring the fluorine content in a metallurgical slag melting agent. The device comprises a steam conveying part, a sample reaction part and a condensation collection part, wherein the reaction part comprises a conical flask, a heating device, a quartz distillation fluorine measuring tube and a thermometer; an inlet of the quartz distillation fluorine measuring tube is connected with an outlet of the steam conveying part through a latex tube, and an outlet of the quartz distillation fluorine measuring tube is connected with the condensation collecting part through a latex tube. The high-boiling-point phosphoric acid is adopted as reaction acid, the temperature change range is expanded, the temperature is controlled in an oil bath mode, the reaction temperature can be accurately controlled, the accuracy of the measurement result is improved, waste of samples and the reaction acid is reduced due to the design of the slender quartz distillation fluorine measurement pipe, and the device is low in overall cost, wide in application range and beneficial to application and popularization.

Description

technical field [0001] The invention relates to a method for chemically analyzing materials, in particular to a device and method for measuring fluorine content in a metallurgical slag reducing agent. Background technique [0002] Fluoride is widely used in iron and steel metallurgical production. Continuous casting mold slag, KR calcium oxide-based desulfurizer and most slag reducing agents are inseparable from the presence of fluoride. Fluorine in metallurgical slag can reduce the melting point of slag and Viscosity improves the kinetic conditions of the reaction between slag and metal or slag and inclusions, and acts as a flux and diluent, which is beneficial to the smooth flow of the process and the improvement of the quality of the billet. [0003] Fluoride ion detection methods are more commonly used ion selective electrode method, pyrolysis method, distillation separation capacity method. This method belongs to a distillation separation volumetric method, the existin...

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Problems solved by technology

This method belongs to a distillation separation volumetric method, the existing distillation separation volumetric method such as GB / T 6730.26-2017 Determination of fluorine content in iron ore thorium nitrate titration method, CN 110346508A A kind of fluorine salt determination device in calcium-based desulfurization agent and Measurement methods, etc., all require the distillation temperature to be kept at 130-140°C, because the distillation temperature will be incomplete if the temperature is lower than 130°C, and the perchloric acid will smoke when the temperature is too high, which will affect the observation of the end point.

In addition, the sample is decomposed by adding perchloric acid and phosphoric acid. Due to the narrow temperature range, it is difficult to control the actual operation, resulting in error effects

Although CN 110346508A solves the problem of temperature stability by connecting an electric heating jacket with a relatively expensive thyristor temperature controller, there are still problems of inconspicuous color change at the titration end point and waste pollution of perchloric acid

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