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Method for continuous determination of content of Ca, Mg and Ba in Si-Ca-Ba-Mg alloy

A determination method and technology for magnesium alloys are used in the continuous determination of barium content and the volumetric determination of calcium and magnesium in silicon-calcium-barium-magnesium alloys, which can solve the problems of cumbersome operation, waste of reagents, and high cost, shortening the operation process, improving the The effect of production efficiency and reduction of inspection costs

Inactive Publication Date: 2015-11-18
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

Calcium, magnesium and barium are mostly determined separately by chemical analysis method, which wastes reagents and high cost
The determination of calcium and magnesium generally uses ammonia water to separate interfering elements, which is cumbersome and time-consuming.

Method used

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  • Method for continuous determination of content of Ca, Mg and Ba in Si-Ca-Ba-Mg alloy
  • Method for continuous determination of content of Ca, Mg and Ba in Si-Ca-Ba-Mg alloy
  • Method for continuous determination of content of Ca, Mg and Ba in Si-Ca-Ba-Mg alloy

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Embodiment Construction

[0036] 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.

[0037] 1. Method summary: Dissolve the sample in a polytetrafluoroethylene beaker with nitric acid (67%)-hydrofluoric acid (40%), add sulfuric acid (5%) to smoke (1-2 minutes after the sulfuric acid smokes, , the solution is in the form of wet salt, and if the sulfuric acid smokes for too long, barium sulfate and calcium sulfate will form barium persulfate and calcium persulfate, which cannot be dissolved by adding hydrochloric acid in the later stage, which will affect the measurement results.) Take it off, after cooling, Carefully add 5mL of hydrochloric acid (65%) along the wall of the cup, heat to dissolve the salts; add 150mL of water to the test solution, add a little hydroxylammonium hydrochloride (this step is to mask the iron), heat and cook until the solution turns from yellow to colorless, remove...

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Abstract

The invention discloses a method for continuous determination of the content of Ca, Mg and Ba in Si-Ca-Ba-Mg alloy. The method includes the steps that a Si-Ca-Ba-Mg alloy sample is added into one beaker, no sample is added in the other breaker which serves as blank control, nitric acid-hydrofluoric acid mixed solutions are added respectively for dissolving the sample, and sulfuric acid is added till smoking happens; afterwards, hydrochloric acid is added for dissolving slats, water and hydroxylamine hydrochloride are added and heated to be boiled till the solutions are changed to be colorless from being yellow, the solutions are filtered into a large volumetric flask, sediments are washed by dilute sulphuric acid and water, and the sediments together with filter paper are placed into a porcelain crucible; ashing, firing and weighing are carried out, and accordingly the content of the Ba is obtained; two groups of quantitative solutions are selected to be put in beakers from the constant volume solution and the blank solution, one group is sequentially added with triethanolamine, water, hydroxylamine hydrochloride and a potassium hydroxide solution, several drips of magnesium sulfate are added, a proper quantity of calcein indicator is added, and EDTA is used for titration till fluorescent green disappears, and accordingly the content of the Ca is obtained; the other group is sequentially added with triethanolamine, water, hydroxylamine hydrochloride and an ammonia-ammonium chloride buffered solution, an eriochrome black T indicator is added, EDTA is used for titration till fuchsia is turned into blue, and accordingly the content of the Mg is obtained.

Description

technical field [0001] The invention belongs to the field of ferroalloy analysis, and relates to a continuous measuring method for measuring calcium, magnesium and barium 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 rece...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION
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