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Continuous determination method for content of calcium oxide and magnesium oxide in blast furnace slag

A measurement method, calcium oxide technology, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve the problems of time-consuming, low cost, reduce detection cost, The effect of accurate data

Inactive Publication Date: 2015-07-22
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 and magnesium oxide in blast furnace slag in the existing method

Method used

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  • Continuous determination method for content of calcium oxide and magnesium oxide in blast furnace slag
  • Continuous determination method for content of calcium oxide and magnesium oxide in blast furnace slag
  • Continuous determination method for content of calcium oxide and magnesium oxide in blast furnace slag

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Embodiment Construction

[0032] 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.

[0033] 1. Method summary: Dissolve the sample in a polyethylene plastic beaker with hydrochloric acid (65%), nitric acid (67%)-hydrofluoric acid (40%), add perchloric acid to smoke, the smoke is clear, and no smoke can be seen , the test solution dried up. Add 10mL of hydrochloric acid (65%) and heat to dissolve the salts. Transfer the test solution to a 250mL volumetric flask, dilute to the mark and dissolve. Take two parts of 50mL solution, put them in two 250mL beakers respectively, add 50mL triethanolamine (12%) to one part, add 50mL water, add a little hydroxylamine hydrochloride, add 30mL potassium hydroxide solution (20%), add a few drops Magnesium sulfate (0.5%) and an appropriate amount of calcein are titrated with EDTA standard solution until the fluorescent green disappears as the end point. ...

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Abstract

The invention discloses a continuous determination method for content of calcium oxide and magnesium oxide in blast furnace slag. The continuous determination method comprises the following steps: putting a blast furnace slag test sample into a polyethylene plastic beaker, and taking the other beaker without the test sample as a blank control; then adding hydrochloric acid and nitric acid-hydrofluoric acid respectively to dissolve; adding perchloric acid to form smoke, and adding hydrochloric acid to heat dissolved salts; transferring testing solutions into a high-capacity bottle respectively and diluting to a scale to make the volume constant; taking two parts of the solutions with the same quantity from each solution; sequentially adding triethanolamine, water and hydroxylamine hydrochloride into one part of the test sample and the blank control; adding a potassium hydroxide solution, and adding several drops of magnesium sulfate and a suitable amount of calcein; titrating with an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution until fluorescent green disappears and stopping titrating, and recording the volume to calculate the content of calcium oxide; sequentially adding triethanolamine, the water and hydroxylamine hydrochloride into the other part of the test sample and the blank control; adding an ammonia-ammonium chloride buffering solution, and adding a suitable amount of a chrome black T indication agent; and titrating with an EDTA standard solution until purple red becomes blue and stopping titrating, and recording the volume to calculate the content of magnesium oxide.

Description

technical field [0001] The invention relates to the field of slag analysis, in particular to a continuous measuring method for measuring calcium oxide and magnesium oxide in blast furnace slag by volumetric method. Background technique [0002] Because slag has the characteristics of low melting point, low density and insolubility in pig iron, slag and iron can be separated in the blast furnace smelting process to obtain pure pig iron, which is the basic function of the blast furnace slagging process. In addition, slag has the following effects on blast furnace smelting: [0003] (1) Reduction of alloy elements and desulfurization reactions between slag and iron play a role in controlling the composition of pig iron. For example, high alkalinity slag can promote desulfurization reaction, which is beneficial to the reduction of manganese, thereby improving the quality of pig iron. [0004] (2) The formation of slag has caused the soft melting zone and dripping zone in the b...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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