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Determination method of calcium content in calcium containing ferroaluminium-manganese alloy

A measurement method, the technology of ferromanganese alloy, is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, which can solve problems such as high cost, high technical content, and tediousness, and achieve cost Low cost, short operation process, easy to grasp the effect

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

At present, most of the methods for determining calcium in low-calcium aluminum manganese ferromanganese use ICP inductively coupled plasma instrument analysis, but the cost is high, the technical content is high, and a series of standard solutions are required at the same time, which is very cumbersome

Method used

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Embodiment Construction

[0022] 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.

[0023] 1. Summary of the method: Add hydrochloric acid (25%) to the beaker to dissolve the calcium-aluminum-manganese-ferroalloy sample, and add an appropriate amount of deionized water during the dissolution process to completely dissolve the sample (the dissolution process is very fast, generally within ten minutes. Dissolve completely), remove, after cooling, add 50mL triethanolamine (12%) (must be added first, in order to firstly cover interfering elements such as iron and aluminum), add 50mL water, add a little hydroxylamine hydrochloride (add hydrochloric acid The purpose of hydroxylamine also plays a role in further masking, and the amount of addition is generally about 0.5 grams.), add 30mL potassium hydroxide solution (20%) (as a buffer solution, the complexation of calcium and EDTA requires a pH v...

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Abstract

The invention discloses a determination method of the calcium content in a calcium containing ferroaluminium-manganese alloy. The method comprises the following steps of adding a calcium containing ferroaluminium-manganese alloy sample with the mass m into one beaker, enabling the other beaker to be empty so as to be used as blank control, later respectively adding hydrochloric acid, dissolving the sample on a low-temperature electric hot plate, taking out after the sample is dissolved, respectively and sequentially adding triethanolamine, water and hydroxylamine hydrochloride after cooling, adding potassium hydroxide solution to keep the pH not to be lower than 12, adding a few drops of magnesium sulfate and appropriate amount of calcein indicator, titrating by utilizing EDTA standard solution with the concentration C until the fluorescent green is disappeared as a terminal point, recording the volume as V and V0 respectively, and obtaining the calcium content as WCa% =C(V-V0)MCa100 / m*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 calcium-containing aluminum-manganese-ferroalloys. 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. [0003] In recent years, with the transformatio...

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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