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Method for measuring fluorine in calcium fluoride

A measurement method, calcium fluoride technology, applied in the field of analysis and testing, can solve problems such as lowering sintering temperature, reducing the service life of production equipment, and environmental pollution

Inactive Publication Date: 2019-08-16
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CaF 2 It can reduce the sintering temperature of the furnace charge, reduce fuel consumption, and at the same time enhance the liquid phase viscosity of the clinker during sintering, and promote the formation of tricalcium silicate; in the ceramic industry, CaF 2 Mainly used as enamel, it can play a role in color and flux in the production process of enamel; CaF 2 It is also used in the enamel industry and cast stone production, but whether it is in the metallurgical industry or the building material industry, some calcium fluoride will decompose at high temperature and form gaseous fluoride and escape, which will not only cause environmental pollution, but also form corrosive substances. Strong hydrofluoric acid corrodes equipment and reduces the service life of production equipment

Method used

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  • Method for measuring fluorine in calcium fluoride
  • Method for measuring fluorine in calcium fluoride
  • Method for measuring fluorine in calcium fluoride

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Weigh 0.3999g of 1# calcium fluoride (particle size ≤ 200 mesh) to an accuracy of 0.0001, (with the sample as a reagent blank) and place it in a silver crucible filled with 6.0052 g of potassium hydroxide, cover the crucible and leave a gap, place Decompose at 680°C for 8 minutes at high temperature, take out the crucible and turn it to cool slightly, put it in a 500ml beaker, add 20-50ml hot water, cover the watch glass immediately, after the melt falls off, use hot water and a small amount of 1:5 Clean the crucible and cover with hydrochloric acid solution (scrub with a glass rod with a rubber tip). Hydrochloric acid solution was added dropwise with constant stirring until the solution was clear. Remove the beaker, rinse the watch glass and cup wall with deionized water, cool, dry filter with medium-speed filter paper and wash the acid-insoluble matter with deionized water for more than 5 times, collect the filtrate and washing solution to 500mL.

[0020] Take 10ml o...

example 2

[0025] Weigh 0.2009g of 2# calcium fluoride (particle size ≤ 200 mesh) to an accuracy of 0.0001, (with the sample as a reagent blank) and place it in a silver crucible containing 4.0031 g of potassium hydroxide, cover the crucible and leave a gap, place Decompose at 700°C for 10 minutes at high temperature, take out the crucible and turn it to cool slightly, put it in a 500ml beaker, add 20-50ml hot water, cover the watch glass immediately, after the melt falls off, use hot water and a small amount of 1:3 Clean the crucible and cover with hydrochloric acid solution (scrub with a glass rod with a rubber tip). Hydrochloric acid solution was added dropwise with constant stirring until the solution was clear. Remove the beaker, rinse the watch glass and cup wall with deionized water, cool, dry filter with medium-speed filter paper and wash the acid-insoluble matter with deionized water for more than 5 times, collect the filtrate and washing solution to 500mL.

[0026] Take 5ml of...

example 3

[0031] Weigh 0.1005g of 3# calcium fluoride (particle size ≤ 200 mesh) to an accuracy of 0.0001, (with the sample as a reagent blank) and place it in a silver crucible filled with 2.0052 g of potassium hydroxide, cover the crucible and leave a gap, place Decompose at high temperature at 720°C for 15 minutes, take out the crucible and turn it to cool slightly, put it in a 500ml beaker, add 20-50ml hot water, cover the watch glass immediately, after the melt falls off, use hot water and a small amount of 1:1 Clean the crucible and cover with hydrochloric acid solution (scrub with a glass rod with a rubber tip). Continue to add 1:1 hydrochloric acid solution dropwise under constant stirring until the solution is clear. Remove the beaker, rinse the watch glass and cup wall with deionized water, cool, dry filter with medium-speed filter paper and wash the acid-insoluble matter with deionized water for more than 5 times, collect the filtrate and washing solution to 500mL.

[0032] ...

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Abstract

The invention discloses a method for measuring fluorine in calcium fluoride. The method comprises the following specific steps that in a muffle furnace, calcium fluoride is decomposed in a silver crucible under the action of potassium hydroxide; the molten slag in the crucible is subjected to leaching by hot water and dilute hydrochloric acid dissolving until the obtained solution is clear and bright, and then the solution is subjected to filtering, washing and constant volume processing; and by taking a saturated calomel electrode as a reference electrode, a fluoride ion selective electrode is adopted for measuring fluorine in the solution from the separately-taken sample solutions at 25 DEG C or below, so that the content of fluorine in the calcium fluoride samples is worked out. The method has the advantages that the analysis is simple and rapid, and the result is accurate and reliable.

Description

technical field [0001] The invention relates to an analysis and test method, in particular to a method for determining fluorine in calcium fluoride. Background technique [0002] Fluorine is one of the widely distributed elements in nature, and its main form is CaF 2 It exists in the form and is widely enriched in fluorspar and phosphate rock. Current CaF 2 It is mainly used in the three major industries of metallurgy, chemical industry and building materials, but with the in-depth development of fluorine chemical comprehensive utilization technology, CaF 2 The application in other industries is also expanding, and its strategic position and value significance have become more important. For example, in the metallurgical industry, CaF 2 It has the characteristics of lowering the melting point of refractory substances, promoting the flow of slag, separating slag and metal well, desulfurizing and dephosphorizing during the smelting process, and enhancing the forgeability a...

Claims

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Application Information

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IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 田言徐伟杨丽萍李会勇秦红胡国涛陶绍程刘旭何兵兵陈相谢娟杨俊
Owner WENGFU (GRP) CO LTD
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