Method for continuously measuring contents of calcium and magnesium in silicon, calcium, barium and magnesium alloy

A determination method and technology of magnesium alloys are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., which can solve the problems of waste of reagents, cumbersome operation and high cost, and improve production. Efficiency, shorten the operation process, reduce the effect of inspection cost

Inactive Publication Date: 2015-11-25
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

Calcium and magnesium are mostly determined separately by chemical analysis method, which wastes reagents and high cost
The determina

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  • Method for continuously measuring contents of calcium and magnesium in silicon, calcium, barium and magnesium alloy
  • Method for continuously measuring contents of calcium and magnesium in silicon, calcium, barium and magnesium alloy

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[0033] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0034] 1. Method summary: Use nitric acid (67%)-hydrofluoric acid (40%) to dissolve the sample in a polyethylene plastic beaker, add perchloric acid (70%) to produce smoke, the smoke will be clean, no smoke can be seen, try The liquid dries up. Add 10 mL of hydrochloric acid (65%), and heat to dissolve the salts. Transfer the test solution to a 250mL volumetric flask and dilute to a constant volume. Divide two 50mL solutions into two 250mL beakers, add 50mL triethanolamine (12%) to one portion, add 50mL water, add a little hydroxylamine hydrochloride, and add 30mL potassium hydroxide solution (20%, keep pH not low In 12), appropriate amount of calcein, titrate with EDTA standard solution until the fluorescence green disappears as the end point; add 50mL triethanolamine (12%), add 50mL water, add a little hydroxylamin...

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Abstract

The invention discloses a method for continuously measuring contents of calcium and magnesium in silicon, calcium, barium and magnesium alloy. The method comprises the following steps: adding a silicon, calcium, barium and magnesium alloy test sample into one flask, taking the other flask as a blank contrast, respectively adding a nitric acid-hydrofluoric acid mixed solution to dissolve the test sample, adding perchloric acid for smoking, then adding hydrochloric acid to dissolve salts, transferring the test solution into a large-capacity bottle, diluting to the scale, respectively taking two groups of quantitative solutions from the volume-fixed solution into the flasks, respectively adding triethanolamine, water, hydroxylamine hydrochloride, a potassium hydroxide, several drops of magnesium sulfate and a proper amount of a calcein indicator into one group in sequence, and titrating by EDTA until fluorescent green disappears; respectively adding triethanolamine, water, hydroxylamine hydrochloride, an ammonia-ammonia chloride buffering solution and an eriochrome black T indicator, and titrating by EDTA until amaranth is turned into blue, and obtaining the content of magnesium.

Description

technical field [0001] The invention belongs to the field of ferroalloy analysis, and relates to a continuous measuring method for measuring calcium and magnesium contents in silicon-calcium-barium-magnesium alloy by volumetric method. Background technique [0002] Deoxidation of molten steel is an essential process in the steelmaking process, and the choice of deoxidizer is very important. From the history of deoxidizers used in steelmaking, pure aluminum (generally aluminum cakes, Al content > 95%) was used initially, due to its light specific gravity (2.79gPcm 3 ), the aluminum cake is not easy to penetrate into the molten steel, thus limiting the effective utilization of aluminum. Later, silicon-aluminum iron composed of Si and Al was used instead of aluminum cake, so the weight increased (about 4.3gPcm 3 ), so that the effective utilization rate of Al element is doubled, and the consumption of deoxidizer for steelmaking is also reduced accordingly. In recent years...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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