Measuring method of calcium content in silicon-calcium alloy

A silicon-calcium alloy and measurement method technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve problems such as long time consumption, achieve low cost and reduce detection costs. , the effect of saving drugs

Inactive Publication Date: 2015-08-05
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0004] In order to solve the time-consuming problem of determining the calcium content in silicon-calcium alloys in existing methods

Method used

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  • Measuring method of calcium content in silicon-calcium alloy

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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. Summary of the method: Dissolve the calcium-silicon alloy sample in a polyethylene plastic beaker with nitric acid (67%)-hydrofluoric acid (40%), add 5mL perchloric acid (70%) to smoke, smoke off, 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 complex...

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Abstract

The invention discloses a measuring method of calcium content in silicon-calcium alloy. The method includes: a silicon-calcium alloy sample with the mass of m is added into a teflon beaker, another teflon beaker without the silicon-calcium alloy sample serves as blank control, nitric acid-hydrofluoric acid mixture is respectively added into the two beakers to dissolve the sample, perchloric acid is respectively added after the sample is dissolved, heating is continued until sulfuric acid generates smoke, hydrochloric acid dissolving salts are respectively added after the sulfuric acid stops generating smoke and test solutions are dried and cooled, the test solutions are respectively moved to large-capacity bottles and diluted to scale constant volume, volumetric solutions are taken from constant-volume solutions and respectively added into beakers, triethanolamine, water and hydroxylamine hydrochloride are respectively sequentially added, potassium hydroxide solution is added to keep pH to be not lower than 12, a few drops of magnesium sulfate are added, appropriate amount of calcein indicator is added, EDTA standard solution with concentration of C is used for titration until fluorescent green disappears, the volume is respectively recorded as V and V0, and the calcium content is WCa%=C(V-V0)MCa100 / mK*100.

Description

technical field [0001] The invention relates to the field of ferroalloy analysis, in particular to a method for measuring calcium content in silicon-calcium alloy by volumetric method. 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 cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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