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Antihydration MgO-CaO clinker and its preparation method

An anti-hydration and clinker technology, applied in the field of refractory materials, can solve the problems of polluting molten steel, reducing the high temperature strength and corrosion resistance of materials, etc. simple effect

Inactive Publication Date: 2007-11-14
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in these two methods, the former will reduce the high-temperature strength and corrosion resistance of the material due to the reaction of the introduced admixture with the clinker, and the phosphorus in the latter coating will dissolve into the molten steel and pollute the molten steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 The appearance is brown magnesia-calcium sand, and its chemical composition is SiO 2 0.67%, Al 2 o 3 0.19%, Fe 2 o 3 0.55%, CaO 56.03%, MgO 41.80%, K 2 O 0.021%, Na 2 O 0.13%, I.L 0.51%, particle size 4.00~3.00mm, soaked in oxalic acid solution for 20 seconds, dried at 110℃, in CO 2 It is made by heat treatment at 800℃×1h under the protection of atmosphere.

[0016] Simultaneously with separate CO 2 treatment, Al(H 2 PO 4 ) 3 solution and CO 2 Composite treatment, comparison without any treatment, hydration weight gain rate and pulverization rate are listed in the table below.

[0017]

Embodiment 2

[0018] Example 2 The chemical composition is SiO 2 1.50%, Al 2 o 3 0.88%, Fe 2 o 3 1.14%, CaO 24.91%, MgO 71.17%, K 2 O is 0.013%, Na 2 O is 0.08%, I.L is 0.31% magnesia-calcium sand, its particle size is 5.00 ~ 2.00mm, soaked in oxalic acid solution for 30 seconds, dried at 110 ℃, in CO 2 Heat treatment at 700℃×1h under atmosphere protection. Its hydration weight gain rate is 0.03%, and the pulverization rate is 1.10%, while the hydration weight gain rate without any treatment is 0.3%, and the pulverization rate is 2.10%.

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Abstract

An antihydrating MgO-CaO clinker is prepared from Mg-Ca sand containing CaO, MgO, SiO2, Al2O3, Fe2O3, K2O and Na2O through immersing in the aqueous solution of oxalic acid, drying and heat treating under protection of CO2 atmosphere. Its advantages are high resistance to hydration and corrosion and no-pollution to molten steel.

Description

1. Technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesium-calcium refractory material and a preparation method thereof. 2. Background technology [0002] With the continuous improvement of clean steel smelting technology, especially stainless steel smelting technology, MgO-CaO refractory materials have attracted more and more attention due to their superior physical properties, good metallurgical effects, and rich raw material resources. However, the hydration resistance of the MgO-CaO clinker used in it is still the "bottleneck" in the development of this material. A lot of research work has been done at home and abroad for many years: [0003] 1. Introduce Al into MgO-CaO clinker 2 o 3 , V 2 o 5 , AlF 3 , MgF 3 , CaF 2 , or a mixture thereof, to improve the hydration resistance of clinker (US 3753747); [0004] 2. Mainly dolomite ore or light-burned dolomite hydrate, magnesite or light-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/04C04B35/057C04B35/66
Inventor 顾华志张文杰汪厚植洪彦若孙加林欧阳军华
Owner WUHAN UNIV OF SCI & TECH
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