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Determination method of calcium oxide content in open-hearth slag, converter slag and electro-furnace slag

A measurement method, the technology of converter slag, which is applied in the direction of chemical analysis by titration method, can solve the problems of time-consuming, etc., and achieve the effects of low cost, shortened operation process and stable measurement results

Inactive Publication Date: 2015-08-12
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0008] In order to solve the time-consuming problem of measuring calcium oxide in open hearth furnace slag, blast furnace slag and electric furnace slag in the existing method

Method used

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  • Determination method of calcium oxide content in open-hearth slag, converter slag and electro-furnace slag

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Embodiment Construction

[0027] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0028] 1. Method summary: Dissolve the sample in a polytetrafluoroethylene plastic beaker with hydrochloric acid (65%), nitric acid (67%)-hydrofluoric acid (40%), add sulfuric acid to smoke (1 -2 minutes, the sample is in the form of wet salt, if the sulfuric acid smokes for too long, barium sulfate and calcium sulfate will generate barium persulfate and calcium persulfate, which cannot be dissolved by adding hydrochloric acid in the later stage, which will affect the measurement results. In addition, the beaker There is black residue in the middle sample, and after the residue treatment, the calcium in the residue is zero. Therefore, it can be said that after a series of acid treatments in the early stage, the calcium in the sample has been completely dissolved, so the calcium can be directly measured in t...

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Abstract

The invention discloses a determination method of calcium oxide content in open-hearth slag, a converter slag and an electro-furnace slag. The method comprises the following steps: adding a sample which is m in mass to a polytetrafluoroethylene beaker while not adding the sample to another beaker as blank control, respectively adding hydrochloric acid, hydrofluoric acid and nitric acid to dissolve the sample, then adding sulfuric aid until smoke comes out, taking down till the sample is in the form of wet salt, cooling, respectively adding hydrochloric acid, heating and dissolving salts, respectively transferring test solutions to large-volume flasks, diluting to set scales and setting constant volumes, respectively taking quantitative solutions from the solutions with constant volumes and adding into beakers, respectively adding triethanolamine, water and hydroxylamine hydrochloride, adding potassium hydroxide solution to keep pH to be no less than 12, adding some drops of magnesium sulfate and proper amount of a calcein indicator, titrating with an EDTA standard solution which is C in concentration until fluorescent green disappears, and respectively recording volumes as V and V0, thus obtaining calcium content as follows: WCaO%=C (V-V0)MCaO100 / mK*100.

Description

technical field [0001] The invention relates to the field of slag analysis, in particular to a volumetric method for measuring calcium oxide content 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. Different raw materials, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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