Continuous measuring method of calcium and barium content in silicon-calcium-barium and silicon-aluminum-calcium-barium alloy
The technology of a silicon-calcium-barium alloy and a determination method is applied in the field of continuous determination of silicon-calcium-barium and barium content in a silicon-aluminum-calcium-barium alloy. The effect of shortening the operation process, low cost and accurate data
Inactive Publication Date: 2015-08-05
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology
Most of the chemical analysis methods for calcium and barium are determined separately, which is time-consuming and wastes materials
The determination of calcium mostly uses ammonia water to separate interfering elements, which is cumbersome and time-consuming.
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[0028] 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.
[0029] 1. Summary of the method: Use nitric acid (67%)-hydrofluoric acid (40%) to dissolve silicon-calcium-barium or silicon-aluminum-calcium-barium alloy samples in a polyethylene plastic beaker, add sulfuric acid to smoke and wet salt, remove, After cooling, carefully add 5mL of hydrochloric acid (65%) along the wall of the cup, and heat to dissolve the salts. Add 150 mL of water to the test solution, add a little hydroxylammonium hydrochloride (this step is to mask iron) and heat until the solution turns from yellow to colorless. , the particles are very fine, and will penetrate through the filter without padding, which will affect the determination result of barium.) Filter it into a 250mL volumetric flask, wash the precipitate with 1% sulfuric acid for 6-8 times, and then wash it with water for 9-10 t...
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The invention discloses a continuous measuring method of calcium and barium content in silicon-calcium-barium and silicon-aluminum-calcium-barium alloy. The method includes: a silicon-calcium-barium or silicon-aluminum-calcium-barium alloy sample with the mass of m is added into a beaker, another beaker without the silicon-calcium-barium or silicon-aluminum-calcium-barium alloy sample serves as blank control, nitric acid-hydrofluoric acid mixture is respectively added into the two beakers to dissolve the sample, sulfuric acid is added until smoke is generated, hydrochloric acid dissolving salts are respectively added when the sample is in a wet salt state, water and hydroxylamine hydrochloride are added, heating is performed until yellow solution becomes colorless, the solution is filtered and placed into a large-capacity bottle, sediments are washed by dilute sulfuric acid and water, the sediments and filter paper are placed into a ceramic crucible, ashing, burning and weighing are performed, the mass of barium sulfate obtained from the sample and the blank is respectively m1 and m2, and barium content is achieved; volumetric solutions are taken from constant-volume solutions and respectively added into beakers, triethanolamine, water, hydroxylamine hydrochloride and potassium hydroxide solution are respectively sequentially added into the beakers, 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 calcium content is achieved.
Description
technical field [0001] The invention belongs to the field of ferroalloy analysis, and in particular relates to a volumetric method for continuously measuring calcium and barium contents in silicon-calcium-barium and silicon-aluminum-calcium-barium alloys. Background technique [0002] Silicon-calcium-barium alloy is a new type of high-efficiency composite alloy among barium alloys. 2 , BaP 3 ) Function: It is the inoculant and modifier in casting. [0003] Silicon-calcium-barium is a good deoxidizer and desulfurizer. During the deoxidation process, the three elements of silicon, calcium and barium promote each other, which effectively improves the utilization rate. Silicon-calcium-barium can minimize the oxygen content in steel, and the recovery rate of silicon, calcium and barium is higher than that of other alloys. At the same time, other complex oxides formed can easily float up from the molten steel, purify the multiple molten steel, and improve the impact toughness a...
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IPC IPC(8): G01N5/00G01N31/16
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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