CN113912068A - Preparation method of solid-phase silica gel SG foam particles - Google Patents
Preparation method of solid-phase silica gel SG foam particles Download PDFInfo
- Publication number
- CN113912068A CN113912068A CN202111421242.4A CN202111421242A CN113912068A CN 113912068 A CN113912068 A CN 113912068A CN 202111421242 A CN202111421242 A CN 202111421242A CN 113912068 A CN113912068 A CN 113912068A
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- Prior art keywords
- solid
- silica gel
- phase silica
- sand
- particles
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000007790 solid phase Substances 0.000 title claims abstract description 35
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 32
- 239000000741 silica gel Substances 0.000 title claims abstract description 32
- 239000002245 particle Substances 0.000 title claims abstract description 31
- 239000006260 foam Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000005187 foaming Methods 0.000 claims abstract description 5
- 239000008187 granular material Substances 0.000 claims abstract description 3
- 229920002545 silicone oil Polymers 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004605 External Lubricant Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 239000000499 gel Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims 1
- 230000003179 granulation Effects 0.000 claims 1
- 238000002955 isolation Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000011325 microbead Substances 0.000 abstract 2
- 239000010451 perlite Substances 0.000 abstract 2
- 235000019362 perlite Nutrition 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 239000004793 Polystyrene Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 229920002223 polystyrene Polymers 0.000 abstract 1
- 239000006261 foam material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000017060 Arachis glabrata Nutrition 0.000 description 1
- 241001553178 Arachis glabrata Species 0.000 description 1
- 235000010777 Arachis hypogaea Nutrition 0.000 description 1
- 235000018262 Arachis monticola Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 235000020232 peanut Nutrition 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
Images
Classifications
-
- 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
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
-
- 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
-
- 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
- C01P2006/32—Thermal properties
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses solid-phase silica gel and a method for preparing SG foam particles. And granulating the solid-phase silica gel by a flat double granulator, mixing the solid-phase silica gel with the granulated sand, putting the mixture into a rotary kiln, and foaming at 300 ℃ to obtain SG foam granules. Compared with the traditional perlite, pearlite sand and vitrified micro-beads, the preparation method of the SG foam particles has the characteristics of low temperature and low carbon. Has the potential of replacing perlite, pearlife and vitrified micro-beads. Compared with the preparation technology of polystyrene particles, the preparation method has the advantages of obvious cost and environmental protection.
Description
Technical Field
Belongs to the field of inorganic silicon oxide and silicate materials. Foam particle preparation technology.
Background
Chinese patent CN104174341A "A preparation method of solid-phase silica gel" discloses a solid-phase silica gel prepared from quartz sand, which explains that the solid-phase silica gel is a complex synthesized by manpower, the normal temperature environment is a stable solid-phase object, when the temperature is higher than 108 ℃, the solid-phase to liquid-phase transfer is started, and the special physical and chemical properties and the processability of the material are established due to the wide critical interval. Chinese patent CN112934133A, a preparation method of modified solid-phase silica gel, discloses a preparation method of modified solid-phase silica gel, which uses calcium-neutralized trichlorosilane solid waste as partial raw material to replace quartz sand, reduces raw material cost, simplifies formula and prepares modified solid-phase silica gel. The method comprises the following steps: simplified formulation, mild reaction and easy control. The solid phase silica gel product prepared by the method has the product characteristics of obviously improved water resistance. Chinese patent CN104177115A, a method for preparing foam material from solid-phase silica gel, discloses that solid-phase silica gel is softened by infrared irradiation under the action of nucleating agent, foam stabilizer, surfactant, foaming agent, etc., foamed by microwave irradiation, and cured at high temperature to obtain solid-phase silica gel foam material.
Silicon gel: silica gel is abbreviated as SG.
Disclosure of Invention
Chinese patent CN104177115A "a method for preparing foam material from solid-phase silica gel" uses microwave radiation foaming technology, and it can be seen that the method makes full use of microwave penetrability to prepare SG foam material with a certain thickness. However, when the diameter of SG foam particles is less than or equal to 30mm, the complicated foaming equipment is obviously not needed, firstly, the expandable solid-phase silica gel particles are prepared, and based on the phase change characteristic of the solid-phase silica gel, an extrusion granulator is selected, and a flat twin granulator with higher productivity is preferred. Because the homodromous flat double-granulator has no self-cleaning property, the solid-phase silica gel is seriously bonded between the screw and the screw sleeve, the resistance is very large, and the flat double-granulator can not reach the designed productivity. A plurality of external lubricants are tested, preferably hydroxyl silicone oil, dimethyl silicone oil, polyhydrogen silicone oil, hydrogen-containing silicone oil and high-hydrogen-containing silicone oil are used as the lubricants, the problems of serious adhesion, excessive resistance and limited capacity of solid-phase silicone gel between a screw and a screw sleeve are solved, the capacity is improved, and the flat double-granulator reaches the designed capacity. In particular, the hydrogen-containing silicone oil, polyhydrogen silicone oil and high hydrogen-containing silicone oil not only have good external lubrication effect, but also obviously improve and improve the water resistance and weather resistance of the product. A simple rotary kiln is selected as foaming equipment, problems appear in experiments, extruded solid-phase silica gel particles are foamed and adhered to each other at the same time to form an adhered particle shape similar to that of a candied haw or peanut, qualified SG foam particle finished products cannot be obtained, and poor sphericity can be obviously seen even if few adhered SG foam particles appear. Selecting granular sand with certain fineness as an isolating agent, mixing the granular sand with solid-phase silica gel particles and feeding the mixture into a rotary kiln, adjusting the mixing ratio, wherein the volume ratio of the solid-phase silica gel particles to the granular sand is about 1: 2-5, namely, the SG foam particles do not adhere, improving the rotary kiln, increasing the granular sand of the isolating agent, preserving heat and refluxing a spiral conveying pipe, and allowing the granular sand to flow back to the inlet of the rotary kiln for recycling. When the temperature of the granular sand at the feeding port is more than or equal to 100 ℃, SG foam granules with good sphericity are obtained. The volume ratio of the separant particle sand to the solid-phase silica gel particles is further optimized to be 2.5-5 to 1, the diameter of the particle sand is further optimized, and the diameter ratio of the particle sand to the solid-phase silica gel particles is 0.25-0.75 to 1.
Drawings
FIG. 1 is a schematic flow diagram of a process and apparatus
Detailed description of the preferred embodiment 1
Now, the actual production is described in detail by taking fig. 1 as an example: preparation method of solid-phase silica gel SG foam particles
The equipment comprises the following components: 75 flat two granulator, the long 10m rotary kiln of diameter 0.5m, 680KW gas hot-blast furnace, backward flow conveyer pipe, heat exchanger, return air duct, rotary kiln keep warm outward: adding 10cm of glass wool into 2cm of aerogel felt, and heating with a heat exchanger of 100m2
Continuous production: after 1h of startup: SG foam particle yield of 15m per hour3Granulating by a granulator for 1.8T per hour, wherein the outlet temperature of a heat exchanger is 160 ℃, the inlet temperature of a reflux separant is 230 ℃, and the digestion rate of natural gas is 35m per hour3。
Detailed description example 1 product sampling inspection
Randomly extracting the products for detection: bulk density of 62 Kg/m3And the barrel pressure is 180 Kpa. The thermal conductivity is 0.048W/(m.K).
Claims (1)
1. A preparation method of solid-phase silica gel SG foam particles is characterized in that firstly, solid-phase silica gel and an external lubricant are fed into a flat double-granulator for granulation, secondly, the solid-phase silica gel particles prepared by the flat double-granulator and isolating agent particle sand for preventing the solid-phase silica gel particles from being adhered to each other in a foaming process are mixed into a rotary kiln according to the volume ratio of 1: 2.5-5, thirdly, the solid-phase silica gel particles are foamed in the rotary kiln, fourthly, the foamed SG foam particles and the isolating agent particle sand are screened out from a discharge port of the rotary kiln, fifthly, the SG foam particles are packaged after being cooled, and the particle sand for isolation is spirally conveyed and flows back to a feed port for recycling; the foaming temperature of the rotary kiln is controlled to be 260-300 ℃ by taking the temperature of the granular sand at the discharge port as a reference; the external lubricant is one or the combination of more than two of high hydrogen-containing silicone oil, hydrogen-containing silicone oil or polyhydrogen silicone oil, and the adding amount of the external lubricant is 0.15 to 0.5 percent of the mass of the solid-phase silicone gel; the diameter ratio of the diameter of the separant granular sand to the solid-phase silica gel granules prepared by the granulator is 0.25-0.75 to 1, and the granular sand is preferably artificial ceramsite sand with good sphericity or quartz sand subjected to corner cutting treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111421242.4A CN113912068A (en) | 2021-11-26 | 2021-11-26 | Preparation method of solid-phase silica gel SG foam particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111421242.4A CN113912068A (en) | 2021-11-26 | 2021-11-26 | Preparation method of solid-phase silica gel SG foam particles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113912068A true CN113912068A (en) | 2022-01-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111421242.4A Pending CN113912068A (en) | 2021-11-26 | 2021-11-26 | Preparation method of solid-phase silica gel SG foam particles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113912068A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409337A (en) * | 2022-01-29 | 2022-04-29 | 新疆土木工程检测科技有限公司 | Method for preparing self-heat-insulation building block by air-set sand and grouting |
-
2021
- 2021-11-26 CN CN202111421242.4A patent/CN113912068A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409337A (en) * | 2022-01-29 | 2022-04-29 | 新疆土木工程检测科技有限公司 | Method for preparing self-heat-insulation building block by air-set sand and grouting |
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