Determination method for content of calcium in calcium-containing silicon-aluminum alloy
A determination method and technology for aluminum alloys, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of long time and achieve low cost, stable measurement results, The effect of accurate data
Inactive Publication Date: 2015-08-05
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology
[0005] In order to solve the time-consuming problem of determining the calcium content in calcium-containing silicon-aluminum alloys in existing methods
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[0024] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.
[0025] 1. Method summary: Use nitric acid (67%)-hydrofluoric acid (40%) to dissolve the calcium-containing silicon aluminum alloy sample in a polytetrafluoroethylene plastic beaker, add sulfuric acid to smoke (after sulfuric acid smokes and smokes heavily 1- It takes 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 can not be dissolved by adding hydrochloric acid in the later stage, which will affect the measurement results.) Remove, After cooling, carefully add 5 mL of hydrochloric acid (65%) along the wall of the cup, and heat to dissolve the salts. Transfer the test solution to a 250mL volumetric flask and dilute to a constant volume. From the 250mL solution after the constant v...
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The invention discloses a determination method for the content of calcium in calcium-containing silicon-aluminum alloy. The determination method comprises the following steps: adding a calcium-containing silicon-aluminum alloy sample with the mass being m into a polytetrafluoroethylene beaker while taking another polytetrafluoroethylene beaker without a calcium-containing silicon-aluminum alloy sample as a blank control; then respectively adding nitric acid and hydrofluoric acid mixed liquid, and dissolving the samples on a low-temperature electric heating plate; after the samples are dissolved, respectively adding sulfuric acid, and continuously heating till the sulfuric acid smokes; after the samples are in a wet salt state, taking down, cooling, and respectively adding hydrochloric acid to heat and dissolve salts; respectively transferring test liquid into a large-volume bottle, and diluting to certain scale for fixing the volume; respectively taking a quantitative solution from the fixed-volume solution into the beakers, and respectively adding triethanolamine, water and hydroxylamine hydrochloride in sequence; adding a potassium hydroxide solution to maintain that the pH is not less than 12; adding drops of magnesium sulfate and a proper amount of calcein indicating agent; performing titration with an EDTA standard solution till fluorescent green disappears, and recording the volumes as V and V0 respectively, thereby obtaining the content of calcium according to the formula that W<Ca>%=C(V-V0)M<Ca>100 / m K*100.
Description
Technical field [0001] The invention relates to the field of ferroalloy analysis, in particular to a method for measuring calcium content in calcium-containing silicon aluminum alloy by volumetric method. Background technique [0002] The calcium-silicon-containing aluminum alloy deoxidizer is an aluminum-based technology deoxidizer developed and produced for deep deoxidation of molten steel in steel plants without increasing silicon or nitrogen. It can absorb inclusions in steel, significantly improve the fluidity of molten steel, and solve the problem of water flocculation and pores under the skin of steel billets in continuous casting. Used for all types of high-quality steel, low-carbon steel, brushed steel and stainless steel. [0003] The use of calcium-containing silicon aluminum alloy has good deoxidation and exhaust effect, no bubbles in the casting billet, no nodules in the nozzle, and good liquidity of molten steel. The use of calcium-containing silicon aluminum alloy ...
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Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION