A dense deoxidized body for pollution-free deoxidation of metal melts and its preparation method

A metal melt and deoxidizer technology, applied in the field of metallurgy, can solve the problems of reducing the gasification rate and loss of aluminum body, affecting the deoxidation rate, and failing to meet the deoxidation demand of metal melt, so as to achieve the effect of avoiding pollution and high deoxidation efficiency

Active Publication Date: 2017-10-27
NORTHEASTERN UNIV
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Problems solved by technology

[0004] CN202913013U discloses a deoxidized body that is easy to settle. The deoxidized body is composed of a steel core and a pure aluminum body. The gasification rate and loss of the body, but due to the low melting point of pure aluminum, it will melt rapidly when it enters the molten steel, and the generated alumina will spread in the molten steel and pollute the molten steel, which still cannot meet the deoxidation requirements of industrial metal melts.
[0005] Stabilized ZrO 2 It is widely used in iron and steel metallurgical industry. If it is doped with an appropriate amount of transition metal elements, the material can have ion-electronic mixed conductivity and excellent chemical stability and mechanical properties. CN1335413A discloses a deoxidizer with good thermal shock resistance , composed of stable zirconia and high-temperature-resistant metal molybdenum or nickel, but the molybdenum or nickel on the surface of the deoxidized body is easily oxidized at high temperature, and the generated oxide does not have electronic conductivity, which affects the deoxidation rate
But so far, there is no use of ZrO 2 Research Report on Deoxidation of Metal Melts Based on Mixed Conductor Dense Deoxidizers

Method used

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  • A dense deoxidized body for pollution-free deoxidation of metal melts and its preparation method
  • A dense deoxidized body for pollution-free deoxidation of metal melts and its preparation method
  • A dense deoxidized body for pollution-free deoxidation of metal melts and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Dense deoxidizer for non-pollution deoxidation of metal melts, molecular formula is Ce 0.75 Zr 0.25 o 2 , its chemical composition according to mass percentage is: 14.26% of zirconium element, 65.72% of cerium element, and the balance is oxygen and unavoidable impurities. Its preparation method is carried out according to the following process steps:

[0035] (1) Preparation of composite oxalate precursor: ZrOCl 2 ·8H 2 O, Ce 2 (CO 3 ) 3 and C 2 h 4 o 4 2H 2 O by n(ZrOCl 2 ·8H 2 O):n(Ce 2 (CO 3 ) 3 ):n(C 2 h 4 o 4 2H 2 (2) = 0.25: 0.375: 0.375 ratio feeding, after mixing evenly, adding Tween 60 with a mass fraction of 5%, ball milling until the particle size reaches ≤ 100 μm, to obtain a composite oxalate precursor;

[0036] (2) Preparation of mixed conductive powder: the composite oxalic acid precursor was dried at a constant temperature of 70°C, then calcined at 600°C for 4 hours, and then ground again after cooling until the particle size reached ≤1...

Embodiment 2

[0046] Dense deoxidizer for non-pollution deoxidation of metal melts, molecular formula is Cr 0.5 Zr 0.5 o 2 , its chemical composition according to mass percentage is: 44.02% of zirconium element, 25.09% of chromium element, and the balance is oxygen and unavoidable impurities. Its preparation method is carried out according to the following process steps:

[0047] (1) Preparation of composite oxalate precursor: ZrOCl 2 ·8H 2 O, Cr 2 (CO 3 ) 3 and C 2 h 4 o 4 2H 2 O by n(ZrOCl 2 ·8H 2 O):n(Cr 2 (CO 3 ) 3 ):n(C 2 h 4 o 4 2H 2 (0)=0.5: 0.25: 0.75 ratio feeding, after mixing evenly, add the Tween 60 that mass fraction is 10%, ball milling reaches ≤ 100 μm to particle diameter, obtains composite oxalate precursor;

[0048] (2) Preparation of mixed conductive powder: the composite oxalic acid precursor was dried at a constant temperature of 60°C, then calcined at 600°C for 6 hours, and then ground again after cooling until the particle size reached ≤100 μm to o...

Embodiment 3

[0053] Dense deoxidizer for pollution-free deoxidation of metal melts, molecular formula is Tb 0.25 Zr 0.75 o 2 , its chemical composition according to mass percentage is: 48.82% of zirconium element, 28.35% of terbium element, and the balance is oxygen and unavoidable impurities. Its preparation method is carried out according to the following process steps:

[0054] (1) Preparation of composite oxalate precursor: ZrOCl 2 ·8H 2 O, Tb 3 o 4 and C 2 h 4 o 4 2H 2 O by n(ZrOCl 2 ·8H 2 O):n(Tb 3 o 4 ):n(C 2 h 4 o 4 2H 2 (0)=0.75: 0.125: 1.125 ratio feeding, after mixing evenly, add the Tween 60 that mass fraction is 15%, ball milling reaches ≤ 100 μm to particle diameter, obtains composite oxalate precursor;

[0055] (2) Preparation of mixed conductive powder: the composite oxalic acid precursor was dried at a constant temperature of 80°C, then calcined at 600°C for 4 hours, and then ground again after cooling until the particle size reached ≤100 μm to obtain a m...

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Abstract

The invention provides a dense deoxidization body for unpolluted deoxidation of metal melts and a preparation method thereof. The dense deoxidization body comprises chemical components, by mass percentage, 10-65% of zirconium, 0-60% of stable metal, 0.5-70% of transition metal and the balance oxygen and inevitable impurities. The preparation method comprises the steps that (1) after zirconium compounds, stable metal oxide and transition metal oxide are evenly mixed with oxalic acid, a surface active agent is added into the mixture, and the mixture is subjected to ball milling until the grain sizes are smaller than or equal to 100 [mu]m; (2) a composite oxalic acid precursor is dried at 60-80 DEG C in a constant temperature mode, then is calcined for 4-6 h, and is ground again to enable the grain sizes to be smaller than or equal to 100 [mu]m after cooling; (3) mixed conductor powder is put into a hollow mold, compacted by 150-200 MPa isostatic pressure, and sintered for 6-10 h after being taken out; and (4) a hollow mixed conductor is filled with aluminum powder after being cooled, the conductor is sealed after being filled up and compacted, and the dense deoxidization body is obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a dense deoxidized body used for pollution-free deoxidation of metal melts and a preparation method thereof. Background technique [0002] The cleanliness of the metal seriously affects the performance and quality of the metal. There are many factors that determine the cleanliness of the metal. The key link is the deoxidation operation in the smelting process. Traditional deoxidation methods include vacuum deoxidation and direct deoxidation using deoxidizers. Vacuum deoxidation equipment is huge and expensive, the depth of deoxidation is not enough, and it will also affect the composition control of smelting. Therefore, vacuum deoxidation is only used as an auxiliary method. The main deoxidation method is to use deoxidation However, the deoxidized products produced by the deoxidizer can easily pollute the molten metal. [0003] At present, the requirements for met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/10C21C7/06
CPCC21C7/06C22B9/10
Inventor 刘涛秦华杰王珊刘健
Owner NORTHEASTERN UNIV
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