Method for measuring contents of silicon-calcium elements in silicon-calcium alloy
A silicon-calcium alloy and element content technology, applied in the field of chemical element analysis and determination, can solve the problems of environmental and personal hazards, poor measurement accuracy, cumbersome operation process, etc., to avoid pollution, improve accuracy and precision, and analyze methods advanced effects
Active Publication Date: 2014-08-27
TAIYUAN HEAVY IND
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Problems solved by technology
[0007] The shortcomings of the current national standard method in the determination process are that it is necessary to weigh the sample twice and dissolve the sample twice. The operation process is cumbersome and time-consuming, and the measurement accuracy is poor. Acid treatment samples with high pollution such as acid will bring harm to the environment and people
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[0040] The assay method of silicon-calcium element content in a kind of silicon-calcium alloy of the present invention comprises the following steps:
[0041] 1. Experimental Preparation
[0042] The calcium-silicon alloy sample is ground by a sample preparation machine to pass through a 180-200 mesh analytical sieve.
[0043] 2. Use the alkali fusion method to melt the sample at high temperature. The flux is 2-6g of solid alkali. The melting process is: weigh 0.1-0.5g of the sample and 2-6g of sodium hydroxide solid in a nickel crucible, cover it, and put it in a nickel crucible. Put it into a high-temperature furnace and heat it at a low temperature, then slowly raise the temperature to 700 degrees to melt for 15 minutes, take it out, and cool it down. Wash the melted sample with deionized water and concentrated hydrochloric acid into an evaporating dish, heat and evaporate, dry, add concentrated hydrochloric acid to acidify, add warm water and stir until the soluble salts ...
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The invention relates to a method for measuring the contents of silicon-calcium elements in a silicon-calcium alloy. After a sample is grinded and passes through an analysis sieve with 180-200 meshes, the method provided by the invention is characterized in that the sample is fused at high temperature by adopting an alkali fusion method; the fusion course comprises the steps of: weighing and adding the sample and sodium hydroxide solid to a nickel crucible; after adding the mixture to a high temperature furnace to be heated, taking out and cooling; washing the fused analysis sample to an evaporation dish by utilizing deionized water and hydrochloric acid; drying and adding the hydrochloric acid to be acidized; adding warm water to be stirred until soluble salts are completely dissolved; instantly filtering by utilizing quantitative filter paper; enabling the filtrate to be constant volume in a volumetric flask to prepare a sample analysis solution; and maintaining the precipitations to be analysis components. The method for respectively measuring the contents of silicon and calcium provided by the invention comprises the following steps: measuring the content of the silicon with precipitation and filter paper by utilizing a weight analysis method after ashing, firing, cooling and weighing; and measuring the content of the calcium with the sample analysis solution by utilizing a volumetric method. The method provided by the invention has the advantages of once sample weighing, multi-element continuous measurement, time and labor saving, energy conservation, consumption reduction and the like and can reduce the damage of hydrofluoric acid to human bodies and environments.
Description
technical field [0001] The invention belongs to a method for analyzing and measuring chemical elements, in particular to a method for measuring the content of silicon-calcium elements in silicon-calcium alloys. Background technique [0002] Both calcium and silicon have a strong affinity for oxygen. Especially calcium, not only has a strong affinity with oxygen, but also has a strong affinity with sulfur and nitrogen, so silicon-calcium alloy is an ideal composite deoxidizer and desulfurizer. Silicon-calcium alloy not only has strong deoxidation ability, the deoxidized products are easy to float and discharge, but also can improve the performance of steel, and improve the plasticity and toughness of steel. [0003] At present, silicon-calcium alloys are used in the production of high-quality steel, special steel and special alloys. For example, steel grades such as rail steel, low carbon steel, and stainless steel, and special alloys such as nickel-based alloys and titaniu...
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IPC IPC(8): G01N31/16G01N1/44G01N5/04
Inventor 张凤萍
Owner TAIYUAN HEAVY IND