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Method for determining content of fluorine in mold flux for continuous casting

A technology of continuous casting mold flux and fluorine content, applied in the fields of analytical chemistry and metallurgy, can solve problems such as environmental pollution, reduce the service life of production equipment, etc., and achieve the effect of strong shielding of interfering ions, increase of melting temperature, and good permeability

Inactive Publication Date: 2018-07-31
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the continuous casting process, due to the high temperature, part of the calcium fluoride in the mold flux will decompose and form gaseous fluoride and escape, which not only causes environmental pollution, but also forms highly corrosive Hydrofluoric acid corrodes equipment and reduces the service life of production equipment

Method used

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  • Method for determining content of fluorine in mold flux for continuous casting
  • Method for determining content of fluorine in mold flux for continuous casting
  • Method for determining content of fluorine in mold flux for continuous casting

Examples

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example 1

[0034] 1. Processing of mold flux samples: Weigh 0.1000 g of three ground mold flux samples (No. 1) into a corundum crucible, and then weigh 1.1 g of Na 2 o 2 and 0.6 g of ZnO flux in a crucible, after mixing, place it in a muffle furnace heated to about 400°C, raise the temperature to 780°C, keep the temperature constant for 20 minutes, slightly open the furnace door, and wait for the temperature of the muffle furnace to drop to 400°C Take out the crucible when left or right; after it cools down slightly, soak the sample in the crucible with hot water, filter it into a 100 mL plastic volumetric flask, wash with water and make up to volume.

[0035] 2. Determination of fluorine content in the sample solution: Separately take 10mL of the above test solution into a 25mL volumetric flask, add 10mL of total ionic strength buffer solution (pH5.8), constant volume, shake well, and place in a constant temperature water bath for constant temperature to 30°C; pour the test solution in...

example 2

[0041] 1. Processing of mold flux samples: Weigh 0.1000 g of 3 parts of ground mold flux samples (No. 2) into corundum crucibles, and then weigh 1.2g of Na 2 o 2 and 0.6 g of ZnO flux in a crucible, after mixing, place it in a muffle furnace heated to 450 °C, heat up to 800 °C, keep the temperature for 20 min, slightly open the furnace door, and wait for the temperature of the muffle furnace to drop to about 400 °C Take out the crucible; after it cools slightly, soak the sample in the crucible with hot water, filter it into a 100 mL plastic volumetric flask, wash it with water and make it to volume.

[0042] 2. Determination of fluorine content in the sample solution: Separately take 10mL of the above test solution into a 25mL volumetric flask, add 10mL of total ionic strength buffer solution (pH5.8), constant volume, shake well, and place in a constant temperature water bath for constant temperature to 30°C; pour the test solution into a 50 mL plastic beaker in turn, use a s...

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Abstract

The objective of the invention is to provide a method for determining the content of fluorine in mold flux for continuous casting by using a fluoride ion selective electrode. The method comprises thefollowing concrete steps: (1) drawing a standard fluorine curve: with cyclohexanediaminetetraacetic acid-dipotassium phosphate-potassium dihydrogen phosphate as a total ion concentration buffer solution (with a pH value of 5.8), separately determining the potential values of the fluorine ion selective electrode in solutions ranked according to a sequence from low concentration to high concentration at a temperature of 30 DEG C with a saturated calomel electrode as a reference electrode, and drawing a figure E(mv)-lg(cF<->) (mg / l) of the potential values and the logarithmic values of fluorinions so as to obtain the fluorine standard curve; (2) in a muffle furnace, subjecting a sample of the mold flux for continuous casting to decomposition in a corundum crucible under the action of a mixedflux of Na2O2 and ZnO; (3) subjecting slag in the crucible to leaching with hot water, filtering and washing, and carrying out fixing to a constant volume; and (4) taking a sample solution, adding thetotal ion concentration buffer solution, carrying out fixing to a constant volume, determining the potential of the electrode in the formed test solution, finding out a corresponding fluorine concentration in the standard curve, and calculating the content of fluorine in the sample of the mold flux for continuous casting.

Description

technical field [0001] The invention relates to a method for measuring the fluorine content in continuous casting mold flux, which belongs to the fields of metallurgy and analytical chemistry. Background technique [0002] Since the 1960s, continuous casting has brought a technological revolution to the steel industry. It can be said that the full continuous casting of steelmaking enterprises has become a symbol of enterprise modernization. Mold slag is continuously adding powdery or granular slag to the molten steel surface of the crystallizer during the pouring process of continuous casting, which plays a role in isolating air, purifying molten steel, lubricating the mold and improving the heat transfer effect in the continuous casting process And so on. The development of continuous casting has higher and higher requirements for mold slag. Metallurgists have carried out a lot of research and development work on mold slag, and achieved certain results, but there is stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
CPCG01N27/416
Inventor 张俊杰陈梦丹李红霞李国江
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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