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Determination method of free calcium oxide in furnace slag

A free calcium oxide and determination method technology, which is applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of many interfering elements, complex matrix components, and low measurement accuracy.

Inactive Publication Date: 2012-04-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above methods 1 and 2 are the methods recommended by China Metal Association. These two methods have the following disadvantages: method 1 and 2 are only for blast furnace slag, but slag includes blast furnace slag, converter slag, electric furnace slag, etc., and the measurement accuracy for other slags Not high, matrix interference is serious
Methods 3 and 4 are for the determination of free calcium oxide in cement. For samples such as slag, the matrix composition is complex and there are many interfering elements.

Method used

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  • Determination method of free calcium oxide in furnace slag
  • Determination method of free calcium oxide in furnace slag
  • Determination method of free calcium oxide in furnace slag

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The mensuration of free calcium oxide in the blast furnace slag of embodiment 1:

[0029] Weigh 0.5g sample into a dry 250mL Erlenmeyer flask, add 90mL ethylene glycol-absolute ethanol solution, 0.2g sucrose, 10mL glycerin, place the Erlenmeyer flask on a shaker for 40min, and then place it on a constant temperature water bath Heat at 95°C for 40min. After the solution in the Erlenmeyer flask is cooled to room temperature, filter it into a 250mL volumetric flask with double-layer quantitative filter paper, wash the filter residue and the Erlenmeyer flask with absolute ethanol, then dilute to the mark with boiled and cooled deionized water, and mix well.

[0030] Draw 50.00mL of test solution into a 250mL beaker, add 50mL of water, 2 to 3 drops of magnesium chloride solution, 5mL of triethanolamine solution, 15mL of sodium hydroxide solution, and 0.1g of calcium indicator. After fully shaking, immediately titrate with EDTA standard titration solution to The solution tur...

Embodiment 2

[0041] The mensuration of free calcium oxide in the converter slag of embodiment 2:

[0042] Weigh 0.3g sample into a dry 250mL Erlenmeyer flask, add 80mL ethylene glycol-absolute ethanol solution, 0.1g sucrose, 5mL glycerin, place the Erlenmeyer flask on a shaker for 30min, and then place it on a constant temperature water bath Heat at 90°C for 30min. After the solution in the Erlenmeyer flask is cooled to room temperature, filter it into a 250mL volumetric flask with double-layer quantitative filter paper, wash the filter residue and the Erlenmeyer flask with absolute ethanol, then dilute to the mark with boiled and cooled deionized water, and mix well.

[0043] Draw 50.00mL of test solution into a 250mL beaker, add 50mL of water, 2 to 3 drops of magnesium chloride solution, 5mL of triethanolamine solution, 15mL of sodium hydroxide solution, and 0.1g of calcium indicator. After fully shaking, immediately titrate with EDTA standard titration solution to The solution turns fr...

Embodiment 3

[0054] The mensuration of free calcium oxide in the electric furnace slag of embodiment 3:

[0055] Weigh 0.8g sample into a dry 250mL Erlenmeyer flask, add 100mL ethylene glycol-absolute ethanol solution, 0.5g sucrose, 15mL glycerin, place the Erlenmeyer flask on a shaker for 60min, and then place it on a constant temperature water bath Heat at 110°C for 60min. After the solution in the Erlenmeyer flask is cooled to room temperature, filter it into a 250mL volumetric flask with double-layer quantitative filter paper, wash the filter residue and the Erlenmeyer flask with absolute ethanol, then dilute to the mark with boiled and cooled deionized water, and mix well.

[0056] Draw 50.00mL of test solution into a 250mL beaker, add 50mL of water, 2 to 3 drops of magnesium chloride solution, 5mL of triethanolamine solution, 15mL of sodium hydroxide solution, and 0.1g of calcium indicator. After fully shaking, immediately titrate with EDTA standard titration solution to The solutio...

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Abstract

The invention discloses a determination method of free calcium oxide in furnace slag, mainly comprising the following technological steps of: (1) dissolving a slag sample by the use of a glycol-anhydrous ethanol mixed solution, and adding a few cane sugar and glycerol to assist the dissolution, so as to make glycol and free calcium oxide to form a water-soluble complex; (2) oscillating for a certain time, and carrying out water-bath heating; (3) cooling, filtering and separating the solution to filter and remove other undissolved impurities; and (4) determining the content of free calcium oxide in the filtrate by an EDTA titration method. According to the invention, the glycol-anhydrous ethanol mixed solution only performs a quantitative reaction with free calcium oxide to form the complex of glycol and calcium oxide without the interference of other calcium phase, thus guaranteeing accuracy and precision of determination results and realizing high-selective, rapid and accurate analysis of free calcium oxide in the furnace slag.

Description

technical field [0001] The invention belongs to the field of chemical analysis, in particular to a method for measuring the content of free calcium oxide in slag, in particular to a chemical phase analysis method for free calcium oxide in slag. Background technique [0002] Slag is a by-product generated by the action of acidic oxides and basic oxides in the high temperature process of metal smelting, including blast furnace slag, converter slag, electric furnace slag, etc. Analyzing and mastering the chemical composition of slag is the key to slow down the erosion of slag in metallurgical production, improve the service life of metallurgical furnaces and high-temperature thermal equipment, reduce the consumption of refractory materials and products, develop high-strength refractory materials and products, and develop comprehensive utilization of slag. important link. [0003] During the smelting process, the formation of fused calcium silicate or calcium aluminate products...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/28
Inventor 张杰戚淑芳
Owner ANGANG STEEL CO LTD
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