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Measuring method of calcium content in silicon-calcium wire

A determination method and technology of calcium content, which can be used in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of cumbersome and time-consuming operation, and achieve the effect of shortening the operation process, saving drugs, and stable measurement results.

Inactive Publication Date: 2015-07-29
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

Most chemical analysis methods use ammonia water to separate interfering elements, which is cumbersome and time-consuming

Method used

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  • Measuring method of calcium content in silicon-calcium wire

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Embodiment Construction

[0021] 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.

[0022] 1. Method summary: Dissolve the silicon-calcium wire sample in a polyethylene plastic beaker with nitric acid (67%)-hydrofluoric acid (40%), add 5mL perchloric acid (70%) to smoke, smoke off, and test solution After drying, after cooling, carefully add 10mL hydrochloric acid (65%) along the wall of the cup, and heat to dissolve the salts. Transfer the test solution to a 250mL volumetric flask, dilute to the scale constant volume, divide 50mL of the solution into a 250mL beaker, add 50mL of triethanolamine (12%), add 50mL of water, add a little hydroxylamine hydrochloride (the purpose of adding hydroxylamine hydrochloride, the same To play a further masking effect, the amount of addition is generally about 0.5 grams.), add 30mL potassium hydroxide solution (20%) (as a buffer solution, the complexatio...

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Abstract

The invention discloses a measuring method of a calcium content in a silicon-calcium wire. The method comprises the steps of adding a silicon-calcium wire sample with mass of m into a polytetrafluoroethylene beaker, taking another polytetrafluoroethylene beaker without a sample as a blank control, then adding a nitric acid-hydrofluoric acid mixed solution to dissolve the sample, adding perchloric acid after the sample is dissolved, continuing to heat till sulfuric acid smokes, adding hydrochloric acid and heating to dissolve salt after no smoke emits and a test solution is dry and cooled, transferring the test solution to a high-capacity bottle, diluting to a scale for constant volume, taking a certain amount of solution from the solution after the constant volume into the beakers, sequentially adding triethanolamine, water and hydroxylamine hydrochloride, adding a potassium hydroxide solution to keep pH (potential of hydrogen) to be not less than 12, adding a plurality of drops of magnesium sulfate and an appropriate amount of calcein indicator, titrating with an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution with a concentration of C till fluorescent green disappears as an end point, recording the volumes as V and V0, and obtaining the calcium content as follows: W<Ca>% is equal to C(V-V0)M<Ca>100 / mK*100.

Description

technical field [0001] The invention relates to the field of ferroalloy analysis, in particular to a volumetric method for measuring calcium content in silicon-calcium wires. Background technique [0002] Since calcium has a strong affinity with oxygen, nitrogen, hydrogen, sulfur and carbon in molten steel, silicon-calcium alloys are mainly used for deoxidation, degassing and carbon fixation of molten steel. Calcium silicon produces a strong exothermic effect when added to molten steel. Calcium turns into calcium vapor in the molten steel, which has a stirring effect on the molten steel, which is beneficial to the floating of non-metallic inclusions. After the silicon-calcium alloy is deoxidized, non-metallic inclusions with larger particles and easy to float are produced, and the shape of non-metallic inclusions is also changed at the same time. and nature. Silicon-calcium alloys are used to produce clean steel, high-quality steel with low oxygen and sulfur content. And ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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