Measuring method for content of calcium oxide and magnesium oxide in open-hearth furnace slag, converter slag and electric furnace slag

Abstract

The invention discloses a measuring method for the content of calcium oxide and magnesium oxide in open-hearth furnace slag, converter slag and electric furnace slag. The measuring method has the advantages of being rapider, more accurate and more efficient. A sample is dissolved with hydrochloric acid, nitric acid-hydrofluoric acid, perchloric acid is added for smoking, and after taking down and cooling, hydrochloric acid is added to heat and dissolve salt; the pH value of the test solution is adjusted to be 7 with ammonium hydroxide, the test solution is heated to be boiled, taken down, slightly cooled and filtered in a volumetric flask, sediment is washed 7-8 times with a hot ammonium chloride solution, after being cooled, the solution is diluted to scales for volume setting, two parts of equal solutions are taken respectively and put in two flasks, triethanolamine, water and a small amount of hydroxylamine hydrochloride are added to one part, the pH value is adjusted to be 12 after a potassium hydroxide solution is added, a proper amount of calcein is added, and titration is conducted with an EDTA standard solution till an end point that fluorescent green disappears and the amount of calcium is obtained; triethanolamine, water and a small amount of hydroxylamine hydrochloride are added to the other part, the pH value is adjusted to be 10 after an ammonia-ammonium chloride buffer solution is added, eriochrome black T serves as an indicator, and titration is conducted with the EDTA standard solution till an end point of pure blue and the resultant amount of calcium and magnesium is obtained.

Description

technical field [0001] The invention relates to the technical field of slag analysis, in particular to a method for determining the contents of calcium oxide and magnesium oxide in open hearth furnace slag, converter slag and electric furnace slag. Background technique [0002] At present, the steelmaking methods used in my country are mainly converter, open hearth furnace and electric furnace steelmaking. According to the steelmaking method, steel slag can be divided into converter steel slag, open hearth furnace steel slag and electric furnace steel slag; according to different production stages, steel slag can be divided into steelmaking slag, casting slag and splash slag. In steelmaking slag, open hearth furnace slag can be divided into initial slag and final slag (including refining slag and tapping slag), electric furnace steel slag is divided into oxidation slag and reducing slag; according to the nature of molten slag, it can be divided into basic slag and Acid slag...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a more rapid, accurate and efficient method for measuring the content of calcium oxide and magnesium oxide in open hearth slag, blast furnace slag and electric furnace slag, so as to solve the problem of measuring open hearth furnace slag, blast furnace slag, When calcium oxide and magnesium oxide are contained in electric furnace slag, it takes a long time and the problem of high cost

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