Device and method for detecting halogen elements in mineral products by steam distillation

Abstract

The invention relates to a device and a detection method for detecting halogen elements in mineral products by a steam distillation method. Through the organic combination of reaction, distillation, absorption, cleaning, and liquid drainage, the F and Cl in the mineral product escape in the form of acid vapor in a strong acid environment, and are driven by the water vapor carrier gas to combine with the complex matrix. The solution is separated and enters the absorption bottle, which is absorbed by low-concentration lye in the form of salt. The concentration of halogen elements is detected by ion chromatography, and the device can be cleaned automatically through the connection of water and steam pipelines. During the detection process, the heating is always continuous, the temperature of the pipe fittings and distilled water inside the device is basically stable, no repeated heating is required, and the automatic cleaning does not require repeated assembly and disassembly of various parts, which greatly saves manpower and time. The whole device has the characteristics of simple structure, small size, compactness, convenient installation, easy operation, safety and reliability, easy to carry, and good airtightness.

Description

technical field [0001] The invention relates to a device and a detection method for detecting halogen elements in mineral products by a steam distillation method. Background technique [0002] At present, the detection of halogens in mineral products is mainly divided into two parts: water-soluble and total amount detection. The detection of water-soluble halogens is relatively simple, and can be extracted by adding water. The pre-treatment for the detection of the total amount of halogens is relatively complicated and varies depending on the detection method. If the titration method and the ion-selective electrode method are used, it is sufficient to dissolve the acid and then adjust the pH for measurement. At present, the commonly used pretreatment method is acid distillation-alkali absorption, and then the content is determined by ion chromatography. Both GB / T 6730.69-2010 and GB / T3884.12-2010 adopt this pretreatment method. [0003] The main devices of the traditional c...

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Problems solved by technology

Since quantitative analysis requires multiple parallel experiments, the repeated assembly, disassembly, heating, and cooling of the device greatly reduces the work efficiency, and causes the internal environment of the device to be unstable, resulting in device errors such as differences in the air tightness of the conduit connection. , affecting the precision of the analysis results

Secondly, in the reaction process, it is difficult to drive all the acid gas into the condenser tube only by the water vapor evaporated from the high-concentration digestion acid, and there are residues in the distillation bottle, and these acid gases have a high boiling point and are difficult to be eliminated in the condenser tube. Cooling, which affects the absorption effect of the absorbent

If distilled water is added to the retort to generate water vapor, the digestion acid will be diluted and complete reaction will not be achieved

In addition, after the reaction is completed, the waste liquid obtained by cleaning the distillation bottle and the condensing tube cannot be collected effectively, and it will cause environmental pollution if it is discharged into the sewer

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