CN107416885A - A kind of method of electric smelting method production cerium oxide - Google Patents
A kind of method of electric smelting method production cerium oxide Download PDFInfo
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- CN107416885A CN107416885A CN201710315501.2A CN201710315501A CN107416885A CN 107416885 A CN107416885 A CN 107416885A CN 201710315501 A CN201710315501 A CN 201710315501A CN 107416885 A CN107416885 A CN 107416885A
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- cerium oxide
- electric smelting
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/90—Other properties not specified above
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to a kind of method of electric smelting method production cerium oxide, cerium oxide raw material is put into batches melting is carried out in electric arc furnaces, it is 110 270V to control electrode voltage during melting, and electric current is 2 15kA, and next group raw material is put into again after last consignment of raw material all fusing, after the completion of melting, 02 hours are incubated, current control during insulation obtains frit in 200 500A, then furnace cooling, by frit by broken, iron removaling removal of impurities and grinding, the electric smelting cerium oxide of varigrained sand shape or powdery is obtained.Present invention process flow is simple, production cost is low, other impurities will not be introduced in production process or produce pernicious gas, meet well enterprise to low cost, high efficiency, environmental protection production requirement, and the purity of obtained electric smelting cerium oxide is up to more than 98%, the product porosity is less than 2%, and bulk density is up to 7.5g/cm3More than, compressive resistance is up to more than 80MPa.
Description
Technical field
The present invention relates to the preparation field of special refractories, specifically a kind of method of electric smelting method production cerium oxide.
Background technology
The oxide of cerium mainly has two kinds of a ceria and cerium sesquioxide, ceria can be aoxidized by cerium sesquioxide and
Into, be relatively stable cerium oxide, therefore, commonly referred to as cerium oxide when refer mainly to ceria, the oxidation mentioned in the present invention
Cerium or electric smelting cerium oxide, refer to ceria.
Common ceria oxide powder because stomata is high and high temperature under the factor such as shrink and be difficult to use at high temperature, limit its
The application of fire resisting material field.It can be generally prepared at present as the cerium oxide that refractory material uses by sintering process, compared to general
Logical ceria oxide powder, the porosity of cerium oxide is relatively low made from sintering process, and typically 5% or so, bulk density is higher, generally
7.21g/cm3, the resistance to elevated temperatures and heat endurance of product can substantially meet the requirement of conventional refractory materials.But burn
Sintering time needed for connection is longer, and technological process is complex, and impurity is readily incorporated in sintering process and easily produces pollution
Gas, thus can not meet enterprise to low cost, high efficiency, environmental protection production requirement, and the purity of product is than common oxygen
It is low to change cerium, the porosity and consistency also have to be hoisted, limit its application in higher level such as special refractories field, nothing
Method meets the requirement of the special refractories in the fields such as Aero-Space, military project, scientific research, optics, electronics.
The content of the invention
The defects of in order to overcome above-mentioned prior art, the technical problems to be solved by the invention be to provide a kind of low cost,
High efficiency, environmental protection electric smelting method production cerium oxide method, cerium oxide made from this method has that purity is high, the porosity is low, body
The features such as product density is big, high temperature resistant, heat endurance and mechanical property are good, it can meet that the use of special refractories will well
Ask.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of method of electric smelting method production cerium oxide, cerium oxide raw material is put into batches melting is carried out in electric arc furnaces, controlled
Electrode voltage during melting is 110-270V, electric current 2-15kA, puts into next group original again after last consignment of raw material all fusing
Material, after the completion of melting, 0-2 hours are incubated, current control during insulation obtains frit in 200-500A, then furnace cooling, will
Frit obtains the electric smelting cerium oxide of varigrained sand shape or powdery by broken, iron removaling removal of impurities and grinding.
The beneficial effects of the present invention are：Prior art is different from, the present invention can be by common oxidation using electric smelting method
Cerium powder is prepared into electric smelting cerium oxide, and technological process is simple, and production cost is low, and other impurities or production will not be introduced in production process
Raw pernicious gas, meet well enterprise to low cost, high efficiency, environmental protection production requirement, and obtained electric smelting oxygen
Change the purity of cerium up to more than 98%, the product porosity is less than 2%, and bulk density is up to 7.5g/cm3More than, compressive resistance can
Up to more than 80MPa, have the characteristics that purity is high, bulk density is big, high temperature resistant, heat endurance and mechanical property are good, can be applied to
The special refractories in the fields such as Aero-Space, military project, scientific research, optics, electronics, also can preparation structure ceramics and function ceramics.
Embodiment
To describe the technology contents of the present invention, the objects and the effects in detail, it is explained below in conjunction with embodiment.
The design of most critical of the present invention is：Cerium oxide is prepared using electric smelting method, and rationally designs smelting technology and insulation
Technique, electric smelting cerium oxide is set to prepare, and obtained electric smelting cerium oxide has that purity is high, bulk density is big, resistance to height
Temperature, the features such as heat endurance and mechanical property are good.
Specifically, the method for electric smelting method production cerium oxide provided by the invention, electric arc furnaces is put into by cerium oxide raw material in batches
Middle carry out melting, it is 110-270V, electric current 2-15kA to control electrode voltage during melting, after last consignment of raw material all fusing
Next group raw material is put into again, after the completion of melting, is incubated 0-2 hours, and current control during insulation is then cold with stove in 200-500A
But frit is obtained, frit is cleaned by broken, iron removaling and grinding, the electric smelting for obtaining varigrained sand shape or powdery aoxidize
Cerium.
By test, using the purity of the electric smelting cerium oxide obtained by above-mentioned electric smelting method up to more than 98%, product stomata
Rate is less than 2%, and bulk density is up to 7.5g/cm3, compressive resistance far superior to common ceria oxide powder and adopted up to 80MPa
The cerium oxide made from sintering process, made special refractories, it can be obtained in the smelting and casting of titanium alloy well
Effect, titanium part mass ratio is more excellent using conventional refractory materials, and can be widely applied to Aero-Space, military project, scientific research, optics, electricity
The special refractories in the fields such as son, it can also be used to preparation structure ceramics and function ceramics.
It was found from foregoing description, the beneficial effects of the present invention are：Prior art is different from, the present invention can using electric smelting method
So that common ceria oxide powder is prepared into electric smelting cerium oxide, technological process is simple, and production cost is low, will not draw in production process
Enter other impurities or produce pernicious gas, meet well enterprise to low cost, high efficiency, environmental protection production requirement, and
The purity of obtained electric smelting cerium oxide is up to more than 98%, and the product porosity is less than 2%, and bulk density is up to 7.5g/cm3With
On, compressive resistance has purity is high, bulk density is big, high temperature resistant, heat endurance and mechanical property are good etc. up to more than 80MPa
Feature, the special refractories in the fields such as Aero-Space, military project, scientific research, optics, electronics is can be applied to, also can preparation structure pottery
Porcelain and function ceramics.
Further, the purity of the cerium oxide raw material is more than 98wt%.
It was found from foregoing description, the beneficial effects of the present invention are：It is more than 98wt% cerium oxide raw material using purity, can
To ensure the electric smelting cerium oxide of high-purity is made.Compared to existing sintering process, because the present invention will not introduce in process of production
Other impurities, therefore obtained electric smelting cerium oxide can keep the purity of raw material well, and meet special refractories
Requirement.
Further, in fusion process, by adjusting the power of electrode, in-furnace temperature is made to be maintained at 2300 DEG C -2400
℃。
It was found from foregoing description, the beneficial effects of the present invention are：By the way that in-furnace temperature is controlled at 2300 DEG C -2400
DEG C, the quality of product can be made more stable.
Further, in insulating process, inert gas is passed through into stove to replace gas original in loss of sheet, and make stove
Interior air pressure is increased to 0.5~1MPa.
It was found from foregoing description, the beneficial effects of the present invention are：Gas original in loss of sheet is replaced using inert gas,
Introduced contaminants can effectively be completely cut off, and inert gas will not react with cerium oxide, further increase the purity of product.Separately
Outside, at a high pressure condition, the crystalline arrangement of cerium oxide is closer, advantageously reduces the porosity of product, improves the body of product
Product density.
Further, the inert gas is nitrogen, helium or argon gas.
Embodiment 1
Raw material cerium oxide (purity 99.99%) is put into electric arc furnaces in batches and carries out melting, coordination electrode voltage is
110V, electric current 2kA, when smelting temperature is more than 2300 DEG C, the raw material added at first starts to melt, and continues to feed, and continues to melt
Change, until raw material is all added and melted, melt liquid carries out insulation 1 hour (insulation current control 200A), then with stove certainly
So cooling obtains frit.Finally frit is cleaned and ground by broken, iron removaling, obtains varigrained sand or powder.
After tested, electric smelting cerium oxide made from the embodiment 1, more than 99.8%, the product porosity is less than finished product purity
2%, bulk density is up to 7.5g/cm3, compressive resistance is up to 80MPa.
Embodiment 2
Raw material cerium oxide (purity 98.5%) is put into electric arc furnaces in batches and carries out melting, coordination electrode voltage is
110V, electric current 2kA, when smelting temperature is more than 2300 DEG C, the raw material added at first starts to melt, and continues to feed, and continues to melt
Change, until raw material is all added and melted, then obtain frit with stove natural cooling.Finally frit is removed by broken, iron removaling
Miscellaneous and grinding, obtains varigrained sand or powder.
After tested, electric smelting cerium oxide made from the embodiment 2, more than 98.3%, the product porosity is less than finished product purity
2%, bulk density is up to 7.3g/cm3, compressive resistance is up to 55MPa.
Embodiment 3
Raw material cerium oxide (purity 99%) is put into electric arc furnaces in batches and carries out melting, coordination electrode voltage is 110V,
Electric current is 2kA, and when smelting temperature is more than 2300 DEG C, the raw material added at first starts to melt, and continues to feed, and continues to melt, and is melted
The power of electrode is adjusted during refining, in-furnace temperature is remained at 2300 DEG C -2400 DEG C, until raw material is all added and melted
Change, then keep voltage constant, by current reduction to 200-500A, be incubated 2 hours, be passed through into stove while insulation nitrogen,
Helium or argon gas make air pressure in stove be increased to 0.5~1MPa to replace gas original in loss of sheet, then with stove natural cooling
Obtain frit.Finally frit is cleaned and ground by broken, iron removaling, obtains varigrained sand or powder.
After tested, electric smelting cerium oxide made from the embodiment 3, more than 98.9%, the product porosity does not surpass finished product purity
1.5% is crossed, bulk density is up to 7.7g/cm3More than, compressive resistance is up to more than 90MPa.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalents that bright description is made, or the technical field of correlation is directly or indirectly used in, similarly it is included in this hair
In bright scope of patent protection.
Claims (5)
- A kind of 1. method of electric smelting method production cerium oxide, it is characterised in that：Cerium oxide raw material is put into electric arc furnaces in batches and carried out Melting, it is 110-270V, electric current 2-15kA to control electrode voltage during melting, is put into again after last consignment of raw material all fusing Next group raw material, after the completion of melting, 0-2 hours are incubated, current control during insulation obtains in 200-500A, then furnace cooling Frit, frit is cleaned and ground by broken, iron removaling, obtains the electric smelting cerium oxide of varigrained sand shape or powdery.
- 2. the method for electric smelting method production cerium oxide according to claim 1, it is characterised in that：The cerium oxide raw material it is pure Degree is more than 98wt%.
- 3. the method for electric smelting method production cerium oxide according to claim 1, it is characterised in that：In fusion process, pass through The power of electrode is adjusted, in-furnace temperature is maintained at 2300 DEG C -2400 DEG C.
- 4. the method for electric smelting method production cerium oxide according to claim 1, it is characterised in that：In insulating process, to stove Inert gas is inside passed through to replace gas original in loss of sheet, and air pressure in stove is increased to 0.5~1MPa.
- 5. the method for electric smelting method production cerium oxide according to claim 4, it is characterised in that：The inert gas is nitrogen Gas, helium or argon gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710315501.2A CN107416885B (en) | 2017-05-08 | 2017-05-08 | A kind of method of electric smelting method production cerium oxide |
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| CN201710315501.2A CN107416885B (en) | 2017-05-08 | 2017-05-08 | A kind of method of electric smelting method production cerium oxide |
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| CN107416885A true CN107416885A (en) | 2017-12-01 |
| CN107416885B CN107416885B (en) | 2019-05-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857261A (en) * | 2010-06-29 | 2010-10-13 | 上海大学 | Method for preparing nano Ce(OH)3 powder |
| CN102275972A (en) * | 2011-06-07 | 2011-12-14 | 上海大学 | Preparation method of Mn-doped CeO2 nano powder |
| CN104261454A (en) * | 2014-08-22 | 2015-01-07 | 郑州市甫明新材料有限公司 | A producing process for preparing cerium oxide polishing powder |
-
2017
- 2017-05-08 CN CN201710315501.2A patent/CN107416885B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101857261A (en) * | 2010-06-29 | 2010-10-13 | 上海大学 | Method for preparing nano Ce(OH)3 powder |
| CN102275972A (en) * | 2011-06-07 | 2011-12-14 | 上海大学 | Preparation method of Mn-doped CeO2 nano powder |
| CN104261454A (en) * | 2014-08-22 | 2015-01-07 | 郑州市甫明新材料有限公司 | A producing process for preparing cerium oxide polishing powder |
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| CN107416885B (en) | 2019-05-14 |
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