CN110386608B - Preparation method of light spherical silicon dioxide - Google Patents
Preparation method of light spherical silicon dioxide Download PDFInfo
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- CN110386608B CN110386608B CN201910754709.3A CN201910754709A CN110386608B CN 110386608 B CN110386608 B CN 110386608B CN 201910754709 A CN201910754709 A CN 201910754709A CN 110386608 B CN110386608 B CN 110386608B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
- C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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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
Abstract
The invention discloses a preparation method of light spherical silicon dioxide, relating to the technical field of inorganic materials, screening quartz mineral powder containing rich fluid inclusion, and screening out specific gravity less than 1.8g/cm3Pulverizing the raw material, pulverizingThe raw material is introduced into a flash furnace by using inert gas carrier gas, and is circulated in a spheroidizing flame region through gas flow, and the specific gravity of the raw material is lower than 1.5g/cm by adjusting the pressure of the gas flow3The powder enters a dust collection chamber to be collected, and spherical closed-pore silicon dioxide is obtained; the preparation method disclosed by the invention is simple in process, and the prepared spherical silicon dioxide has the characteristics of low specific gravity, high strength, low specific surface area, low oil absorption value, high sphericity and the like, can be used as a low dielectric constant and low dielectric loss material, and is used in the fields of high-frequency high-speed copper clad plates for 5G communication and the like.
Description
The technical field is as follows:
the invention relates to the technical field of inorganic materials, in particular to a preparation method of light spherical silicon dioxide.
Background art:
the silica has stable performance and rich content, so that the silica is widely applied to various fields, and the application field of the silica is further expanded due to the excellent structural performance of the hollow structure. The light spherical material is a novel inorganic material and is widely applied to copper-clad plates, pouring sealants, automobile plastics, coatings, paints, heat insulation materials and the like.
Currently, there are two main forms of light spherical silica: hollow glass microspheres and porous silica. The hollow glass beads are complex in components and insufficient in strength, are easy to delaminate when applied to a copper-clad plate, and easily leave a semicircular defect after drilling, so that the performance of the plate is affected. The porous silica has large specific surface area and high oil absorption value, so that the porous silica is difficult to add into an application system, the processing viscosity can be greatly improved, and the physical properties of the product are reduced.
The invention content is as follows:
the invention aims to solve the technical problem of providing a preparation method of light spherical silicon dioxide, and the spherical silicon dioxide prepared by the method has the characteristics of low specific gravity, high strength, low specific surface area, low oil absorption value, high sphericity and the like.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a preparation method of light spherical silicon dioxide comprises the following steps:
(1) screening quartz ore powder containing rich fluid inclusion to obtain quartz ore powder with specific gravity less than 1.8g/cm3The quartz powder is used as a raw material;
(2) pulverizing the raw material to particle size D502～30μm；
(3) Introducing the crushed raw materials into a flash furnace by using inert gas carrier gas, and circulating the raw materials in a spheroidized flame region through airflow;
(4) by adjusting the pressure of the air flow, the specific gravity is lower than 1.5g/cm3The powder enters a dust collection chamber to be collected;
(5) collecting the powder to obtain a specific gravity of 0.5-1.5g/cm3Spherical closed-cell silica.
The screening is realized by grading the balance weight liquid.
The temperature of the flash furnace is higher than 1600 ℃.
The spheroidizing flame region circulates powder by providing a nozzle.
The inert gas is argon.
During the calcination process, the gas-liquid phase in the inclusion can volatilize, and the specific gravity of the powder is further reduced.
The raw material adopted by the invention is quartz powder containing abundant fluid inclusion, the fluid inclusion system refers to an ore forming medium which is captured due to crystal defects in the mineral growth process and exists in the mineral and is in a closed state so far, and quartz is used in a large amount and a large number of forms. The fluid inclusions in the quartz can exist in various forms, including pure liquid phase, pure gas phase, rich liquid phase, rich gas phase, mineral phase containing seeds, and CO containing liquid2Many phases and organic substances are contained.
The invention has the beneficial effects that: the preparation method disclosed by the invention is simple in process, and the prepared spherical silicon dioxide has the characteristics of low specific gravity, high strength, low specific surface area, low oil absorption value, high sphericity and the like, can be used as a low dielectric constant and low dielectric loss material, and is used in the fields of high-frequency high-speed copper clad plates for 5G communication and the like.
Description of the drawings:
FIG. 1 is an SEM photograph of the product produced in example 1.
The specific implementation mode is as follows:
in order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.
Example 1
Fully inspecting the formation history of the quartz ore, screening out quartz ore powder containing rich fluid inclusion, grading by using counter weight liquid, and screening out quartz ore powder with specific gravity less than 1.8g/cm3The quartz powder of (1); pulverizing the raw material to particle size D502-30 μm; introducing the screened powder into a flash furnace by using argon as carrier gas, controlling the temperature of a high-temperature area of the flash furnace to be 1700 ℃, designing four nozzles in the high-temperature area to blow each other, circulating the powder in the high-temperature area, and burning for 30min in a sealed mode; stopping calcining, controlling the pressure of the airflow to be 0.4MPa, and collecting dust to obtain the product of the spherical closed-pore silicon dioxide.
Example 2 and example 3 were performed as in example 1.
The raw material and product specific gravity data for examples 1-3 are shown in table 1.
TABLE 1
As can be seen from FIG. 1, the product has a low specific gravity, a high sphericity and a uniform morphology.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The preparation method of the light spherical silica is characterized by comprising the following steps:
(1) screening quartz ore powder containing rich fluid inclusion to obtain quartz ore powder with specific gravity less than 1.8g/cm3The quartz powder is used as a raw material;
(2) crushing the raw materials to a particle size D502-30 mu m;
(3) introducing the pulverized raw materials into a flash furnace by using inert gas carrier gas, controlling the temperature of a high-temperature area of the flash furnace to be 1700 ℃, designing four nozzles in the high-temperature area to blow each other, circulating the powder in the high-temperature area, and carrying out smoldering for 30 min;
(4) by adjusting the pressure of the air flow, the pressure of the air flow is controlled to be 0.4MPa, and the specific gravity is lower than 1.5g/cm3The powder enters a dust collection chamber to be collected;
(5) collecting the powder to obtain a specific gravity of 0.5-1.5g/cm3Spherical closed-cell silica.
2. The method for preparing lightweight spherical silica according to claim 1, wherein: the screening is realized by grading the balance weight liquid.
3. The method for preparing lightweight spherical silica according to claim 1, wherein: the inert gas is argon.
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| CN201910754709.3A CN110386608B (en) | 2019-08-15 | 2019-08-15 | Preparation method of light spherical silicon dioxide |
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| CN201910754709.3A CN110386608B (en) | 2019-08-15 | 2019-08-15 | Preparation method of light spherical silicon dioxide |
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| CN110386608A CN110386608A (en) | 2019-10-29 |
| CN110386608B true CN110386608B (en) | 2020-06-26 |
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| CN114804128B (en) * | 2022-04-18 | 2023-08-29 | 蚌埠壹石通电子通信材料有限公司 | Spherical silicon dioxide treatment method |
| CN114702038B (en) * | 2022-04-25 | 2023-09-29 | 江苏联瑞新材料股份有限公司 | Preparation method of spherical silicon dioxide micro powder with ultralow dielectric loss |
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| CN103553346B (en) * | 2013-09-30 | 2016-08-31 | 深圳大学 | A kind of preparation method of electric slurry ball-type glass dust |
| CN107055554B (en) * | 2017-05-23 | 2019-02-12 | 中南冶金地质研究所 | A method of nanometer spherical silicon powder is prepared using flame method |
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