CN110787573A - Production method of active silicon powder - Google Patents
Production method of active silicon powder Download PDFInfo
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- CN110787573A CN110787573A CN201911016437.3A CN201911016437A CN110787573A CN 110787573 A CN110787573 A CN 110787573A CN 201911016437 A CN201911016437 A CN 201911016437A CN 110787573 A CN110787573 A CN 110787573A
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- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses a production method of active silicon powder, which is characterized in that a dust removal complete set device for three-stage separation and purification of smelting smoke dust is designed according to the capacity of a silicon-based alloy smelting electric furnace, smelting temperature and calculated filtering area according to the temperature of smoke gas, and the method comprises the following specific steps: (1) separating dust with large specific gravity from flue gas generated by the ore-smelting electric furnace by a gravity cyclone dust collector; (2) the high-temperature flue gas passes through a flue gas water cooling tower to reduce the temperature and further separate dust; (3) and then the flue gas is discharged into a pipeline to enter a flue gas purification chamber, passes through a sub-bin purification chamber in the flue gas purification chamber, and is collected by a filter cloth bag. The invention has the following advantages: the carbon particles and dust are separated and purified in three stages, impurities of silicon-based smoke dust are reduced, the nanometer-scale silicon dioxide micro powder with light specific gravity is collected and enters a smoke purifying chamber, the quality of recycled silicon dioxide is improved, and the silicon dioxide is suitable for being used as a novel powder material in the market.
Description
Technical Field
The invention relates to the comprehensive technical field of waste smoke dust discharged in a silicon alloy smelting inorganization mode, in particular to a production method of active silicon powder.
Background
Along with the strong abundance of the country, the annual steel capacity of the country is gradually increased, pig iron and iron alloy belong to the logical existence of steel, so the capacity of iron alloy is also continuously increased, which causes serious pollution of iron alloy smelting, the iron alloy smelting is that the raw ore is in an ore thermoelectric furnace, the ore fed into the electric furnace is melted through smelting processes (manganese ore and silicon ore) and reducing agents (coke and electrodes) along with the increase of the smelting temperature of the electric furnace, the smelting processes are divided into a slag-free smelting process and a slag smelting process, the production of active silicon powder is a slag-free smelting process technology, a large amount of smoke is discharged in the smelting process, the smoke is discharged in the atmosphere along with unburnt clean carbon and silicon dust to form haze, and pm2.5 ultrafine dust substances are considered in the design of a matched dust remover in the establishment of the ore thermoelectric furnace in the smelting industry, the comprehensive utilization of the recycled smoke dust in the market is not considered, so that the recycled smoke dust cannot be applied in the market due to the fact that impurities are abundant, the recycled smoke dust can only be buried and disposed in an occupied area, after the discarded smoke dust is buried for a long time, potential water source hazards of secondary polluted land are caused under the influence of natural weather, the normalization of environmental pollution treatment and the establishment of a green ecological environment system are realized, the combination of the landfill disposal problem of the smoke dust and the market application is eliminated without influencing the productivity and the environmental requirement of silicon series alloy, and a high and new technology capable of obtaining the application of a new smoke dust conversion powder material-active silicon powder accepted in the market is formed.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provided by the invention is a production method of active silicon powder, which is characterized in that a dust removal complete set device for three-stage separation and purification of smelting smoke dust is designed according to the capacity of a silicon-based alloy smelting electric furnace, smelting temperature and filtering area calculated according to the smoke temperature, and the method comprises the following specific steps:
(1) separating dust with large specific gravity from flue gas generated by the ore-smelting electric furnace by a gravity cyclone dust collector;
(2) the high-temperature flue gas passes through a flue gas water cooling tower to reduce the temperature and further separate dust;
(3) then the flue gas is discharged into a pipeline and enters a flue gas purification chamber, and the dust in the flue gas is collected by a filter cloth bag through a bin separation purification chamber in the flue gas purification chamber;
(4) then the powder collected by the filter cloth bag is processed by a PLC ash removal device;
(5) finally, further processing the silicon powder by a vortex centrifugal separator to obtain the active silicon powder.
Preferably, the temperature of the flue gas after passing through the flue gas circulating water cooling tower is 45-245 ℃.
Preferably, the filter cloth bag is a flumeiss filter bag, and the bottom of the filter cloth bag is sewn by three layers of edge covering and is sewn by reinforced composite sewing.
Preferably, dust removal integrated equipment includes the ore-smelting electric furnace to and the flue gas pipeline under the low smoke cover of ore-smelting electric furnace, and the ore-smelting electric furnace passes through flue gas pipeline connection gravity cyclone, and gravity cyclone passes through pipe connection in flue gas cooling tower, and flue gas cooling tower is connected in the gas cleaning room, and the gas cleaning room passes through PLC and connects vortex centrifuge, and the powder holding vessel is connected to the dust.
Compared with the prior art, the invention has the following advantages: the carbon particles and dust are separated and purified in three stages, impurities of silicon-based smoke dust are reduced, the nanometer-scale silicon dioxide micro powder with light specific gravity is collected and enters a smoke purifying chamber, the quality of recycled silicon dioxide is improved, and the silicon dioxide is suitable for being used as a novel powder material in the market.
Drawings
FIG. 1 is a production flow chart of a method for producing activated silicon powder according to the present invention.
As shown in the figure: 1. the device comprises a smelting electric furnace, 2, a gravity cyclone dust collector, 3, a flue gas cooling tower, 4, a flue gas purification chamber, 5, an induced draft fan, 6, a flue gas purification flue, 7, a vortex centrifugal separator, 8, a powder storage tank, 9, a circulating water tank, 10, a circulating pump, 11 and a water cooling tower.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The production method of the active silicon powder is characterized in that a dust removal complete set device for three-stage separation and purification of smelting smoke dust is designed according to the capacity of a silicon-based alloy smelting electric furnace and smelting temperature and the filtering area calculated according to the smoke temperature, and the method comprises the following specific steps:
(1) separating dust with large specific gravity from flue gas generated by the ore-smelting electric furnace by a gravity cyclone dust collector;
(2) the high-temperature flue gas passes through a flue gas water cooling tower to reduce the temperature and further separate dust;
(3) then the flue gas is discharged into a pipeline and enters a flue gas purification chamber, and the dust in the flue gas is collected by a filter cloth bag through a bin separation purification chamber in the flue gas purification chamber;
(4) then the powder collected by the filter cloth bag is processed by a PLC ash removal device;
(5) finally, further processing the silicon powder by a vortex centrifugal separator to obtain the active silicon powder.
The temperature of the flue gas after passing through the flue gas circulating water cooling tower is 45-245 ℃.
The filter cloth bag is a flumeisi filter bag, and the bottom of the filter cloth bag is sewn by three layers of edge covers and is sewn by reinforced composite sewing. The filter bag is a core component, the quality of the filter material directly influences the dust removal efficiency of the dust remover, the service life of the filter bag directly influences the operating cost of the dust remover, the laminated and water-repellent oil-proof filter material is a surface filtration type filter material, the ash removal is thorough, and the possibility that dust forms a powder layer on the surface of the filter bag is reduced. The filter bag is reasonably cut, the abutted seams are reduced as much as possible, the overlapping width is not less than 10mm, the bag bottom strength and the anti-scouring capacity are improved, the upper end of the filter bag is in a spring piston ring form, the sealing performance is good, the installation reliability is high, and the bag replacement is rapid. Only 1-2 people are needed to change the bag through the upper box body (air purifying chamber) of the dust remover. The filter bag is loaded and unloaded in the air chamber without entering the filter chamber of the dust collector.
Dust removal integrated equipment includes ore-smelting electric furnace to and the flue gas pipeline under the low smoke cover of ore-smelting electric furnace, and ore-smelting electric furnace passes through flue gas pipeline connection gravity cyclone, and gravity cyclone passes through pipe connection in flue gas cooling tower, and flue gas cooling tower connects in the gas cleaning room, and the gas cleaning room passes through PLC and connects vortex centrifuge, and the powder holding vessel is connected to the dust.
The main component of the recovered silicon-based smoke dust is silicon dioxide micropowder generated by contacting silicon monoxide metal steam subjected to high-temperature gasification and reduction in an ore-smelting electric furnace with oxygen in the air outside the furnace, the silicon dioxide micropowder is an ultrafine-grained amorphous bead-shaped structure, and is an amorphous non-metallic mineral inorganic material, and the silicon dioxide micropowder has the characteristics of good reinforcing property, dispersibility, bleeding property, insulativity, extinction property, thixotropy, permeability, thickening property and the like, and the volcanic ash activity index (28d) is more than 125-130, is an irreplaceable unique physicochemical index which cannot be reached by a mineral material subjected to mechanical power processing and grinding, is gradually known by application technical experts of various industries, replaces raw materials and additives of various industries or serves as a hot-melt catalyst, and the application field of the silicon dioxide micropowder is continuously expanded.
The smelting smoke dust of the invention refers to the smoke dust without structure discharge generated in the smelting of silicon alloy, manganese alloy, brown corundum, and the like. The mechanism of soot generation is as follows:
in the smelting process of producing silicon series alloy by using ore-smelting electric furnace, the raw ore raw materials for smelting in the furnace are quartz ore, silicon ore and silicon dioxide containing mineral chemical components: 95-99%, the reducing agent is a carbonaceous raw material and an iron raw material, and the heat required by the reduction is provided by electric energy. Silicon dioxide is a substance with very stable chemical bond, silicon in a metal state has very strong affinity with oxygen, and the silicon is combined with carbon at a lower temperature to generate silicon carbide which becomes a molten steel deoxidizer and a purifying agent in the steel-making and casting industries and is used as the deoxidizer for steel-making, and simultaneously the silicon is also an alloying agent for producing silicon steel, alloy steel and casting alloy and is used as a reducing agent for producing noble metals such as magnesium metal, ferromolybdenum and the like; since the physical and chemical properties of silica are very stable, extremely high temperatures are required for decomposition and reduction. The existing smelting method can provide the required high-temperature and high-strength smelting reduction condition only by an ore-smelting electric furnace.
The ore-smelting electric furnace conducts electricity to the electrodes in the furnace through special transmission transformation equipment, and the current intensity of a single electric furnace is as high as 4-300kva (depending on the capacity of the electric furnace). The current is directed into the furnace through a dedicated electrode, discharging at the tip of the electrode, creating an arc that generates ionized gas with a discharge temperature as high as 2353-. Under the action of electric arc high temperature, mineral is first decomposed to produce gas phase intermediate product monox metal steam, which is adsorbed by burden to produce indirect reduction reaction to produce silicon or silicon micro liquid particle as the reaction product and the initial temperature of silicon reduction is 2026K. In the reduction process, about 10-15% of the SiO gas is not adsorbed by the furnace charge to participate in the reaction, and escapes from the furnace charge along with the high-temperature furnace gas generated by reduction, and is combined with oxygen in the air on the surface of a furnace mouth to generate reaction oxidation reduction to form silica dioxide particulate dust, wherein the oxidation reduction temperature is 653-.
In the case of strong carbon operation or partial carbon enrichment of the charge due to factors such as management and operation skills during the smelting process, when the furnace temperature is about 3353K, silicon dioxide and carbon particles react first to form silicon carbide, which becomes a slag component and a hearth deposit and affects normal operation and the campaign. The temperature for generating the silicon carbide is not high, the temperature for destroying and separating the carbide is as high as 3353K, although the added iron raw material can effectively decompose the silicon carbide at a lower temperature, the product has strict requirements on the content of iron, the process is not allowed, and only a dry-burning electric furnace without feeding materials can be adopted to treat the furnace bottom rising. The furnace condition of electric furnace dry burning treatment can reduce the adsorption efficiency and adsorption volume of furnace burden when the material layer becomes thin, the reaction reduction temperature is increased rapidly, the loss of silicon monoxide gas which is an intermediate product of reaction is accelerated, the amount of furnace gas and smoke dust generated by the electric furnace is increased rapidly and exceeds 40-50% of the smoke generation amount in normal production, which is one of the reasons that the conventional shaping environment-friendly dust removal equipment has no abundant capability and can not effectively solve the problem of smoke pollution treatment discharged by the ore-smelting electric furnace, and unburned carbon particles and dust enter a purification system together to influence the physicochemical components of smoke dust.
The invention collects the physical and chemical indexes of the recovered ore-smelting electric furnace smoke dust:
SiO2>82- - -96% (amorphous silica)
Fe2O+CaO+MgO<1％
I.L (loss on ignition): 0.8 to 1.5 percent
PH (PH value): 2.5- -7.2
Specific resistance: 24X 1014. omega. mm2/m
Average particle size: 0.075-0.225 μm
Specific surface area: 22-28 m2/g
Activity index (28 d): 125-130 mpa
Specific gravity: 2000 to 2200kg/m3
Powder structure: flocculent non-crystal agglomerated three-dimensional bead particle
Natural volume weight: 180 to 280kg/m3
The specific working process of the invention is as follows: smoke gas generated in the smelting process of the silicon-based alloy enters a gravity cyclone dust collector 2 from a smoke pipeline of an ore-smelting electric furnace 1 to perform spiral linear motion, and under the guidance of material gravity settling, dust with larger aggregates or larger specific gravity is gradually separated from the smoke gas and is settled in a dust bin at the bottom of the gravity cyclone dust collector 2; the rest flue gas dust with lighter volume density enters the closed flue gas cooling tower 3 along with high-temperature airflow, the volume of the high-temperature flue gas is shrunk after cooling, the gas flow velocity is reduced, and part of heavier carbon particles and dust which are not separated by the gravity cyclone dust collector 2 are further separated at the position and are settled in a dust bin at the bottom of the flue gas cooling tower 3; meanwhile, the temperature of the flue gas is controlled to be not lower than 100 ℃, the moisture condensation of the water vapor in the flue gas and the influence of the adhesion of a filter bag on the flue gas purification efficiency are avoided, and the quality of the powder is influenced by the moisture agglomeration of the recovered flue gas; the temperature of the flue gas is controlled to be not higher than 245 ℃, and the filter bag is prevented from being damaged by melting. The optimum temperature of the tested flue gas entering the flue gas purifying chamber 4 is 120-165 ℃; the filtering cloth bag of the flue gas purification chamber 4 is specially treated, and the filtering cloth bag is selected from the following materials: flumeis (FMS) filter bag: for the whole bag-type dust collector, the filter bag is the core component. The quality of the filter material directly affects the dust removal efficiency of the dust remover, and the service life of the filter bag directly affects the operating cost of the dust remover. The coated film and the water-repellent and oil-proof filter material are surface filter type filter materials, so that ash is thoroughly removed, and the possibility that dust forms a powder layer on the surface of the filter bag is reduced; the service life of the filter material is long. The bottom of the cloth bag is sewn by three layers of covered edges without exposing burrsThe bottom is sewn in a reinforced composite mode, the filter bag is reasonably cut, the edge joints are reduced as much as possible, the overlapping width is not less than 10mm, and the strength and the anti-scouring capacity of the bag bottom are improved. The PLC pulse ash cleaning device of the flue gas purification chamber 4 is provided with an air source by an air compressor, high-pressure air is sprayed out of each group of filter bags of the flue gas purification chamber 4 through a pipeline, the filter bags are prompted to expand and contract according to the urgency, impact oscillation is caused, meanwhile, the spraying flow is opposite to the filtering air flow, dust attached to the surface of the filter wall is vibrated to be separated from the wall of the filter bag, and the dust is settled in an ash deposition bin below the flue gas purification chamber 4. The dust in each dust deposition bin is discharged from a dust discharging valve at regular intervals and is conveyed to a vortex centrifugal separator 7 by wind power for further decomposition; the vortex centrifugal separator 7 rotates at a high speed according to the contraction of the substances in the soot, and then separates the gaseous silica microparticles from the microparticles of carbon and other molecules difficult to melt in the soot. Different substances in the smoke have different specific gravities, the high-speed airflow generated in the high-speed flying rotation downwards settles and removes the substances heavier than heavy objects, the substances lighter than the specific gravity rotate and rise to be absorbed, the surface layer of the gaseous silicon dioxide micro powder decomposed by the vortex centrifugal separator 7 changes from light grey to white, and the content of SiO in the silicon dioxide chemical elements with the white ratio (inorganic mineral powder colorimetric standard) of 95 is SiO2>More than 98.5 percent, and lighter powder volume weight. The separated gaseous active silica micro powder is sent to a powder storage tank 8 for storage.
The superfine powder after the three-stage separation and purification of the flue gas is recovered in a state of over 100 ℃, packaged and sold after natural cooling, and applied in the market, the gaseous superfine powder new material recovered by the device reformed by the process technology is taken as a new powder material after being sold according to market application, is popularized in the market application according to the characteristics and commodity factors, is named as active silica powder, is a new powder material, namely the active silica powder, is a mechanical pneumatic extrusion mode according to the market application state, is encrypted, reduces the transportation and packaging storage costs, keeps the original application characteristics unchanged, is supported by users of various industries, and is widely used by users of raw material industries such as building engineering industry, metallurgical refractory material industry, chemical industry fusion catalyst and the like, replaces the traditional quartz powder material (white carbon black) ground by mechanical processing.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A production method of active silicon powder is characterized in that a dedusting complete set device for three-stage separation and purification of smelting smoke dust is designed according to the capacity of a silicon-system alloy smelting electric furnace, smelting temperature and calculated filtering area according to smoke temperature, and comprises the following specific steps:
(1) separating dust with large specific gravity from flue gas generated by the ore-smelting electric furnace by a gravity cyclone dust collector;
(2) the high-temperature flue gas passes through a flue gas water cooling tower to reduce the temperature and further separate dust;
(3) then the flue gas is discharged into a pipeline and enters a flue gas purification chamber, and the dust in the flue gas is collected by a filter cloth bag through a bin separation purification chamber in the flue gas purification chamber;
(4) then the powder collected by the filter cloth bag is processed by a PLC ash removal device;
(5) finally, further processing the silicon powder by a vortex centrifugal separator to obtain the active silicon powder.
2. The method for producing activated silicon powder according to claim 1, characterized in that: the temperature of the flue gas after passing through the flue gas circulating water cooling tower is 45-245 ℃.
3. The method for producing activated silicon powder according to claim 1, characterized in that: the filter cloth bag is a flumeisi filter bag, and the bottom of the filter cloth bag is sewn by three layers of edge covers and is sewn by reinforced composite sewing.
4. The method for producing activated silicon powder according to claim 1, characterized in that: dust removal integrated equipment includes ore-smelting electric furnace to and the flue gas pipeline under the low smoke cover of ore-smelting electric furnace, and ore-smelting electric furnace passes through flue gas pipeline connection gravity cyclone, and gravity cyclone passes through pipe connection in flue gas cooling tower, and flue gas cooling tower connects in the flue gas clean room, and the flue gas clean room passes through PLC and connects vortex centrifuge, and vortex centrifuge connects the powder holding vessel.
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| CN201911016437.3A CN110787573A (en) | 2019-10-24 | 2019-10-24 | Production method of active silicon powder |
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| CN201911016437.3A CN110787573A (en) | 2019-10-24 | 2019-10-24 | Production method of active silicon powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114602441A (en) * | 2022-04-18 | 2022-06-10 | 陕西延长石油（集团）有限责任公司 | Activated carbon rapid cooling and separating device and method |
| CN116253328A (en) * | 2022-11-15 | 2023-06-13 | 上海山鹰环保科技有限公司 | Production and preparation process, processing system and powder of active silicon powder and application of active silicon powder |
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| JPH11209118A (en) * | 1998-01-20 | 1999-08-03 | Kawasaki Steel Corp | Dust collector of refining furnace of silicon for solar battery |
| NO20080549L (en) * | 2005-07-29 | 2008-04-08 | Stephen M Lord | Set of processes to remove impurities from a silicon production plant |
| CN101746765A (en) * | 2008-12-01 | 2010-06-23 | 贵州海天铁合金磨料有限责任公司 | Method and device for separating and purifying silicon dioxide micropowder from electric furnace dust |
| CN106799091A (en) * | 2015-11-25 | 2017-06-06 | 衡阳市锦轩化工有限公司 | A kind of white carbon device for recovering powder |
| CN208389592U (en) * | 2018-03-07 | 2019-01-18 | 成都东蓝星新材料有限公司 | A kind of recovery of micro silicon powder system |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11209118A (en) * | 1998-01-20 | 1999-08-03 | Kawasaki Steel Corp | Dust collector of refining furnace of silicon for solar battery |
| NO20080549L (en) * | 2005-07-29 | 2008-04-08 | Stephen M Lord | Set of processes to remove impurities from a silicon production plant |
| CN101746765A (en) * | 2008-12-01 | 2010-06-23 | 贵州海天铁合金磨料有限责任公司 | Method and device for separating and purifying silicon dioxide micropowder from electric furnace dust |
| CN106799091A (en) * | 2015-11-25 | 2017-06-06 | 衡阳市锦轩化工有限公司 | A kind of white carbon device for recovering powder |
| CN208389592U (en) * | 2018-03-07 | 2019-01-18 | 成都东蓝星新材料有限公司 | A kind of recovery of micro silicon powder system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114602441A (en) * | 2022-04-18 | 2022-06-10 | 陕西延长石油（集团）有限责任公司 | Activated carbon rapid cooling and separating device and method |
| CN114602441B (en) * | 2022-04-18 | 2024-04-09 | 陕西延长石油（集团）有限责任公司 | Device and method for rapidly cooling and separating active carbon |
| CN116253328A (en) * | 2022-11-15 | 2023-06-13 | 上海山鹰环保科技有限公司 | Production and preparation process, processing system and powder of active silicon powder and application of active silicon powder |
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Effective date of registration: 20201218 Address after: Room 6535, building 6, No. 199, Tongji Branch Road, Baoshan District, Shanghai 201900 Applicant after: Shanghai Shanying Environmental Protection Technology Co.,Ltd. Address before: Room 904, No.18, Lane 215, mei'an Road, Baoshan District, Shanghai, 201900 Applicant before: Shanghai Qianbao environmental protection new material Co.,Ltd. |
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Application publication date: 20200214 |
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| RJ01 | Rejection of invention patent application after publication |