Method for measuring content of free magnesium oxide in steel slag

A magnesium oxide, free state technology, applied in the field of environmental protection, energy saving and emission reduction, and metallurgy, can solve problems such as brick and product damage, engineering ground and wall cracking, road cracking, etc.

Active Publication Date: 2014-09-24
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When steel slag is used as a building material, it is required that the steel slag has good stability, and the free magnesium oxide (f-MgO) in the steel slag expands with water, which causes the volume stability of the steel slag to be poor
And due to the slow hydration of free magnesium oxide in steel slag, the damage to building materials is more serious
After several years to more than ten years, road cracks, ground uplift, brick and product damage, backfilled engineering ground and wall cracks will occur, thus affecting the utilization of steel slag

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

[0032] Mg(OH) 2 →MgO+H 2 O↑

[0033] The weight loss percentage (mass loss percentage) is the weight loss percentage of water in the above formula, and the weight loss temperature range is: 350°C-430°C. According to the weight loss percentage of water, the weight loss after steaming, drying and grinding is calculated. The weight percentage difference of magnesium hydroxide in the steel slag powder and the steel slag powder before pressure steaming is C×3.2222, and then the weight percent of free magnesium oxide in the steel slag is calculated W=C×3.2222×0.6896;

[0034] In the formula: W—weight percentage of free magnesium oxide in steel slag, %;

[0035] C—the weight loss percentage difference, %; C=C 后 --C 前 ;

[0036] 3.2222—Mg(OH) 2 with H 2 The ratio of the molecular weight of O;

[0037] 0.6896—MgO and Mg(OH) 2 The ratio of the molecular weight.

[0038] Assay C 前 =0.05%, C 后 =1.14%, then C=1.14%-0.05 =1.09%

[0039] Then the weight percentage of free mag...

Embodiment 2

[0044] Mg(OH) 2 →MgO+H 2 O↑

[0045] The weight loss percentage (mass loss percentage) is the weight loss percentage of water in the above formula, and the weight loss temperature range is: 350°C-430°C. According to the weight loss percentage of water, the weight loss after steaming, drying and grinding is calculated. The weight percentage difference of magnesium hydroxide in the steel slag powder and the steel slag powder before pressure steaming is C×3.2222, and then the weight percent of free magnesium oxide in the steel slag is calculated W=C×3.2222×0.6896;

[0046] In the formula: W—weight percentage of free magnesium oxide in steel slag, %;

[0047] C—the weight loss percentage difference, %; C=C 后 --C 前 ;

[0048] 3.2222—Mg(OH) 2 with H 2 The ratio of the molecular weight of O;

[0049] 0.6896—MgO and Mg(OH) 2 The ratio of the molecular weight.

[0050] Assay C 前 =0%, C 后 =1.05%, then C=1.05%

[0051] The weight percentage of free magnesium oxide in the st...

Embodiment 3

[0054] In the formula: W—weight percentage of free magnesium oxide in steel slag, %;

[0055] C—the weight loss percentage difference, %; C=C 后 --C 前 ;

[0056] 3.2222—Mg(OH) 2 with H 2 The ratio of the molecular weight of O;

[0057] 0.6896—MgO and Mg(OH) 2 The ratio of the molecular weight.

[0058] Among them, the determination of C 前 =0%, C 后 =2.15%, then c=2.15%

[0059] The weight percentage of free magnesium oxide in steel slag is W=2.15%×3.2222×0.6896=4.80%. Since there is no free magnesium oxide after the measurement in Example 2, the electric furnace slag mixed with pure MgO measured by thermogravimetric analyzer Y The free magnesium oxide contained in it is specifically 52.5g×4.80%=2.52g, which is roughly equal to the content of 2.5g of pure MgO mixed in. Therefore, the determination method is feasible and the result is accurate.

[0060] Example 4

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Abstract

The invention relates to a method for measuring content of free magnesium oxide in steel slag. The method comprises the following steps: firstly, grinding steel slag to be measured into steel slag powder, putting the steel slag powder into a pressure container for pressure evaporation so as to sufficiently hydrate magnesium oxide in the steel slag powder for completely converting into magnesium hydrate, subsequently drying to be constant weight, grinding the steel slag powder and uniformly stirring, subsequently respectively putting the steel slag before and after the pressure evaporation into a thermogravimetry tester, and calculating the percentage W of the content of free magnesium oxide in steel slag according to the difference C of mass loss percentages of the steel slag before and after the pressure evaporation. By adopting the method, the content of free magnesium oxide can be accurately measured, and the operation is convenient.

Description

technical field [0001] The invention relates to a method for measuring the content of free magnesium oxide in steel slag, in particular to a method for measuring the weight loss of magnesium hydroxide in steel slag by using a thermogravimetric analysis method, belonging to the fields of metallurgy, environmental protection, energy saving and emission reduction. Background technique [0002] At present, due to the promotion of new technologies for rapid steelmaking and slag splashing to protect the furnace, steel slag contains some free magnesium oxide, which will produce the following hydration reaction when it meets water: [0003] f-MgO +H 2 O → Mg(OH) 2 148% volume expansion [0004] When steel slag is used as a building material, it is required that the steel slag has good stability, and the free magnesium oxide (f-MgO) in the steel slag expands with water, which causes the volume stability of the steel slag to be poor. And due to the slow hydration of free magnesium...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 夏春卢忠飞闾文张亮亮朱法强霍光伟
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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