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Method for measuring content of free magnesium oxide in steel slag

A free magnesia and determination method technology, applied in the field of comprehensive utilization of steel slag, can solve the problems of low activity of free magnesia, concrete stability, cracking of steel slag concrete, etc., and achieve the effect of easy color and observation at the end point

Active Publication Date: 2013-02-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the low activity of free magnesium oxide, its hydration rate is slower than other mineral components in steel slag. When it is applied to concrete, it will expand in the later stage, which will crack the steel slag concrete and cause the stability of the concrete in the later stage.

Method used

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  • Method for measuring content of free magnesium oxide in steel slag
  • Method for measuring content of free magnesium oxide in steel slag
  • Method for measuring content of free magnesium oxide in steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] At the same time, weigh two parts of the mixed sample of analytical pure magnesium oxide and calcium oxide and the mixed sample of analytical pure magnesium oxide and calcium hydroxide. Calcium 0.0336 g, 3# is magnesium oxide 0.0121 g, calcium hydroxide 0.0224 g, 4# is magnesium oxide 0.0119 g, calcium hydroxide 0.0443 g. Place them in dry ground-mouthed Erlenmeyer flasks, add 30 mL of ethylene glycol-ethanol solution and catalyst ammonium chloride, connect the Erlenmeyer flasks to a condenser, then magnetically heat and stir, and heat the solution for 20 min after slightly boiling and refluxing. Stop heating, wait until all the liquid in the condenser pipe flows into the conical flask, transfer the liquid in the conical flask to a dry centrifuge tube, wash the conical flask with ethanol for 3 times, pour the washing solution into the centrifuge tube, and place the liquid in the centrifuge at 3500 r Centrifuge at a speed of 15 min, discard the precipitate after centrifu...

Embodiment 2

[0062] At the same time, weigh two samples of free magnesia obtained from analytically pure magnesia by calcination at 1600 °C and heat preservation for 50 minutes. Place them in dry ground-mouth Erlenmeyer flasks, add 30 mL of ethylene glycol-ethanol solution and 0.3220 g of ammonium chloride, connect the Erlenmeyer flasks to a condenser, then magnetically heat and stir, and heat the solution for 20 min after slightly boiling and refluxing. Stop heating, wait until all the liquid in the condenser pipe flows into the conical flask, transfer the liquid in the conical flask to a dry centrifuge tube, wash the conical flask with ethanol for 3 times, pour the washing solution into the centrifuge tube, and place the liquid in the centrifuge at 3500 r Centrifuge at a speed of 15 min, discard the precipitate after centrifugation, pour the upper layer liquid into a dry Erlenmeyer flask, then transfer the upper layer liquid into a 100 mL volumetric flask and dilute to the mark, and final...

Embodiment 3

[0069] At the same time, weigh four samples of 0.4000 g Xinyu steel slag, add different amounts of ammonium chloride, 0.8663 g for 1#, 1.0002 g for 2#, 1.5559 g for 3#, and 2.0000 g for 4#, and place them in the dry grinding port respectively Add 30 mL of ethylene glycol-ethanol solution to the Erlenmeyer flask, connect the Erlenmeyer flask to the condenser, then magnetically heat and stir, and heat the solution for 20 min after slightly boiling and refluxing. Stop heating, wait until all the liquid in the condenser pipe flows into the conical flask, transfer the liquid in the conical flask to a dry centrifuge tube, wash the conical flask with ethanol for 3 times, pour the washing solution into the centrifuge tube, and place the liquid in the centrifuge at 3500 r Centrifuge at a speed of 15 min, discard the precipitate after centrifugation, pour the upper layer liquid into a dry Erlenmeyer flask, then transfer the upper layer liquid into a 100 mL volumetric flask and dilute to ...

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Abstract

The invention relates to a method for measuring the content of free magnesium oxide in steel slag, and particularly adopts an ammonium chloride-glycol-ethanol method to measure the content of the free magnesium oxide in the steel slag. A catalyst ammonium chloride is added into a glycol-ethanol solution to achieve the aim of rapidly extracting the content of the free magnesium oxide in the steel slag. The best adding amount of the ammonium chloride is determined; when the ratio of magnesium in a solution to be detected to the total substance amount of calcium and magnesium is less than 0.1, the more suitable ratio of the ammonium chloride to the total substance amount of the calcium and the magnesium is (12-25):1; and when the ratio of magnesium in the solution to be detected to the total substance amount of the calcium and the magnesium is more than 0.1, the more suitable ratio of the ammonium chloride to the total substance amount of the calcium and the magnesium is (18-30):1. The determination method has the advantages of simple determination process, short needed time, low cost, high accuracy and strong practical applicability.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of steel slag, and in particular relates to a method for measuring the content of free magnesium oxide in steel slag. Background technique [0002] The iron and steel industry is the main pillar industry in my country. According to the latest data from the China Iron and Steel Association, the domestic crude steel output reached 683 million tons in 2011, a year-on-year increase of 8.92%, ranking first in the world. Steel slag is the molten slag discharged during the steelmaking process, which is mainly the oxides generated after the elements in the metal charge are oxidized, the eroded furnace lining material, the furnace repair material, the impurities brought in by the metal charge, and the impurities added to adjust the properties of the steel slag. Slagging materials such as limestone, dolomite, iron ore, silica, etc. According to preliminary statistics, the current annual o...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/22
Inventor 刘家祥郑振叶李敏杜君雷文
Owner BEIJING UNIV OF CHEM TECH
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