CN113351121A - System and method for continuously conveying solid mixed material into chlorination furnace - Google Patents
System and method for continuously conveying solid mixed material into chlorination furnace Download PDFInfo
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- CN113351121A CN113351121A CN202110730329.3A CN202110730329A CN113351121A CN 113351121 A CN113351121 A CN 113351121A CN 202110730329 A CN202110730329 A CN 202110730329A CN 113351121 A CN113351121 A CN 113351121A
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- Prior art keywords
- bin pump
- valve
- bin
- chlorination furnace
- pump
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- 238000005660 chlorination reaction Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 title claims abstract description 48
- 239000007787 solid Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 12
- 238000009423 ventilation Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 8
- 239000002006 petroleum coke Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/02—Halides of titanium
- C01G23/022—Titanium tetrachloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2204/00—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices
- B01J2204/002—Aspects relating to feed or outlet devices; Regulating devices for feed or outlet devices the feeding side being of particular interest
Abstract
A system and a method for continuously conveying solid mixed materials into a chlorination furnace comprise the following steps: opening an exhaust valve of the bin pump A; opening a feed valve of a bin pump A; closing an exhaust valve of the bin pump A, and opening an air inlet valve to introduce fluidizing gas; the pressure of the bin pump A rises to reach a conveying set value, and a discharge valve is opened; when the bin pump A is boosting, the bin pump B starts to execute the steps, the pressure of the bin pump B reaches a conveying set value, the pressure is maintained for standby, and the discharge valve is opened by the bin pump B when the discharge valve is closed by the bin pump A; when the pressure of the bin pump A reaches a set value for stopping conveying, the ventilation is continued for 3-5S, and a discharge valve of the bin pump A is closed and a discharge valve of the bin pump B is opened; repeating the steps to start the next conveying cycle; and when the bin pumps A and B stop feeding, the nitrogen valves on the conveying pipelines are opened simultaneously to control certain nitrogen pressure. The system has simple structure and convenient operation, can automatically control, safely and effectively send the mixture into the chlorination furnace continuously, and ensures the normal operation of the chlorination furnace.
Description
Technical Field
The invention relates to a system and a method for continuously conveying solid mixed materials into a chlorination furnace.
Background
In the production process of chlorinated titanium dioxide, a titanium-rich material, petroleum coke and sodium chloride are mixed according to a certain proportion and then stored in a storage bin, and then conveyed into a chlorination furnace through a conveying device for reaction. The common conveying mode is that a conveying screw is arranged at the bottom of the storage bin to directly feed materials or a fuller pump is used for conveying mixed materials. However, the reaction conditions in the chlorination furnace are harsh, so that the conveying equipment is corroded, and the feeding port is blocked, and the pressure in the chlorination furnace is fluctuated, so that the extremely toxic high-temperature materials in the furnace can return to the conveying equipment, and a larger accident is caused. The material can not be continuously conveyed into the chlorination furnace, so that the process can not be smoothly carried out.
Disclosure of Invention
The invention aims to solve the first technical problem of providing a system which has a simple structure and can safely and effectively convey solid mixed materials into a chlorination furnace.
The second technical problem to be solved by the invention is to provide a method for continuously conveying solid mixed materials into a chlorination furnace, which is convenient to operate and can be automatically controlled to ensure the normal operation of the chlorination furnace.
The invention provides a system for continuously conveying solid mixed materials into a chlorination furnace, which aims to solve the first technical problem and comprises a mixed material bin, two bin pumps and a chlorination furnace, wherein the bin pumps are arranged in parallel;
the two feeding pipes are connected with a mixture bin and are respectively provided with a feeding valve;
the two exhaust pipes are connected with the mixture bin and are respectively provided with an exhaust valve;
the two air inlet pipes are both connected with a fluidizing air source, and are respectively provided with an air inlet valve;
on two discharging pipes joined the back unified connection chlorination furnace, be equipped with the bleeder valve on two discharging pipes respectively, be equipped with the nitrogen gas pipe on the pipeline after two discharging pipes joined, be equipped with nitrogen gas valve and nitrogen gas manometer on the nitrogen gas pipe.
Preferably, the exhaust valve, the feeding valve, the discharging valve and the nitrogen valve are automatic switching valves, and the intake valve is an automatic regulating valve.
Preferably, the pressure gauge of the bin pump, the pressure gauge of the chlorination furnace and the pressure gauge of nitrogen are all electronic pressure gauges.
Preferably, the chlorination furnace has an operating pressure of 0.05-0.1MPa and an operating temperature of 500-.
For the sake of simplicity of explanation, the system for continuously feeding the solid mixed materials into the chlorination furnace is also referred to as the present system.
The system has the advantages that:
1. the system can realize continuous conveying by connecting the two bin pumps in parallel, and ensures the normal operation of the chlorination furnace.
2. The exhaust valve, the feed valve, the discharge valve, the nitrogen valve and the pressure gauge in the system are all automatic valve instruments, and automatic control can be realized.
3. The air inlet valve of the system is an automatic adjusting valve, and the air inlet valve can be automatically adjusted according to the conveying capacity, so that the production cost is saved.
4. The nitrogen pipe of the system is provided with the automatic nitrogen valve, the bin pump stops feeding and opens the valve at the same time, the gas protection is ensured to be always carried out on the feeding pipeline, the high-temperature highly-toxic corrosive materials in the chlorination furnace are prevented from returning, and the equipment is not damaged by high-temperature corrosion.
In order to solve the second technical problem, the invention provides a method for continuously conveying a solid mixed material into a chlorination furnace, which comprises the following steps:
(1) opening an exhaust valve of the bin pump A;
(2) opening a bin pump A feeding valve, and enabling the mixture to enter a bin pump A from a mixture bin;
(3) after the feeding is finished, closing an exhaust valve of the bin pump A, closing a feeding valve of the bin pump A, opening an air inlet valve and introducing fluidizing gas to fully fluidize the materials in the bin pump A;
(4) when the pressure of the bin pump A rises to reach a conveying set value, a discharge valve of the bin pump A is opened, and the material starts to be conveyed;
(5) opening an exhaust valve of a bin pump B, opening a feed valve of the bin pump B, enabling the mixture to enter the bin pump B from a mixture bin, closing the exhaust valve of the bin pump B and closing the feed valve of the bin pump B after the feeding is finished, opening an air inlet valve, introducing fluidizing gas to fully fluidize the material in the bin pump B, increasing the pressure of the bin pump B to reach a conveying set value, and maintaining the pressure for later use;
(6) when the pressure of the bin pump A reaches a set value for stopping conveying, the ventilation is continued for 3-5s, the discharge valve of the bin pump A is closed, and the discharge valve of the bin pump B is opened to start feeding;
(7) repeating the steps (1) to (6) to start the next conveying cycle;
(8) and when the bin pump A and the bin pump B stop feeding, the nitrogen valve on the nitrogen pipe is opened simultaneously, and certain nitrogen pressure is controlled.
Preferably, the solid mixed material is titanium ore, petroleum coke and sodium chloride, the weight percentage is 100:33:1, and the conveying capacity is 10-15 t/h.
Preferably, the delivery setpoint is 0.2 to 0.4 Mpa.
Preferably, the feed stop set value is 0.08 to 0.12 Mpa.
Preferably, the nitrogen pressure is 0.2 to 0.4 MPa.
For the sake of simplicity of explanation, the following method for continuously feeding a solid mixed material into a chlorination furnace is simply referred to as the present method.
The method is convenient to operate, can be automatically controlled, and ensures the normal operation of the chlorination furnace.
Drawings
Fig. 1 is a schematic diagram of the present system.
Detailed Description
Referring to FIG. 1, a system for continuously conveying solid mixed materials into a chlorination furnace comprises a mixed material bin 1, two bin pumps 2A/2B and a chlorination furnace 3, wherein the bin pumps 2A/2B and the chlorination furnace 3 are arranged in parallel, the two bin pumps 2A/2B are respectively marked as a bin pump A and a bin pump B, the bin pump A and the bin pump B are respectively provided with a feeding pipe 4A/4B, an exhaust pipe 5A/5B, an air inlet pipe 6A/6B, a discharge pipe 7A/7B and a bin pump pressure gauge 8A/8B, and the chlorination furnace 3 is provided with a chlorination furnace pressure gauge 31;
the two feeding pipes 4A/4B are both connected with the mixture bin 1, and the two feeding pipes 4A/4B are respectively provided with a feeding valve 41A/41B;
the two exhaust pipes 5A/5B are both connected with the mixture bin 1, and exhaust valves 51A/51B are respectively arranged on the two exhaust pipes 5A/5B;
the two air inlet pipes 6A/6B are both connected with a fluidizing air source, and the two air inlet pipes 6A/6B are respectively provided with an air inlet valve 61A/61B;
the two discharging pipes 7A/7B are converged and then are uniformly connected to the chlorination furnace 3, the two discharging pipes 7A/7B are respectively provided with a discharging valve 71A/71B, a pipeline after the two discharging pipes 7A/7B are converged is provided with a nitrogen pipe 8, and the nitrogen pipe 8 is provided with a nitrogen valve 81 and a nitrogen pressure gauge 82.
The exhaust valve 51A/51B, the feeding valve 41A/41B, the discharging valve 71A/71B and the nitrogen valve 81 are automatic switch valves, and the intake valve 61A/61B is an automatic regulating valve.
The operation pressure of the chlorination furnace 3 is 0.05-0.1Mpa, and the operation temperature is 500-1050 ℃.
The first embodiment is as follows:
a method for continuously conveying solid mixed materials into a chlorination furnace comprises the following steps:
(1) the mixture is stored in the mixture bin 1, and the ratio of titanium ore (high titanium slag or rutile), petroleum coke and sodium chloride is 100:33: 1; the conveying amount is set to be 11t/h, and the pressure gauge 31 of the chlorination furnace 3 is 0.06Mpa (G); opening the exhaust valve 51A of the bin pump A;
(2) opening a bin pump A feeding valve 41A, and enabling the mixture to enter a bin pump A from the mixture bin 1;
(3) after the feeding is finished, closing the exhaust valve 51A of the bin pump A, closing the feeding valve 41A of the bin pump A, and opening the air inlet valve 61A to introduce fluidizing gas to fully fluidize the materials in the bin pump A;
(4) when the pressure of the bin pump A rises to reach a conveying set value of 0.2Mpa (G), a discharge valve 71A of the bin pump A is opened, and the material conveying is started;
(5) opening an exhaust valve 51B of a bin pump B, opening a feeding valve 41B of the bin pump B, enabling the mixture to enter the bin pump B from the mixture bin 1, closing the exhaust valve 51B of the bin pump B and closing a feeding valve 41B of the bin pump B after the feeding is finished, opening an air inlet valve 61B, introducing fluidizing gas to fully fluidize the materials in the bin pump B, increasing the pressure of the bin pump B to reach a conveying set value of 0.2Mpa (G), and maintaining the pressure for later use;
(6) when the pressure of the bin pump A reaches a set value of 0.08Mpa (G) for stopping conveying, the ventilation is continued for 3s, the discharge valve 71A of the bin pump A is closed, and the discharge valve 71B of the bin pump B is opened to start feeding;
(7) repeating the steps (1) to (6) to start the next conveying cycle;
(8) when the feeding of the bin pump A and the bin pump B is stopped, the nitrogen valve 81 on the nitrogen pipe 8 is opened at the same time, and the nitrogen pressure is controlled to be 0.2Mpa (G).
Example two:
a method for continuously conveying solid mixed materials into a chlorination furnace comprises the following steps:
(1) the mixture is stored in the mixture bin 1, and the ratio of titanium ore (high titanium slag or rutile), petroleum coke and sodium chloride is 100:33: 1; the conveying amount is set to be 13t/h, and the pressure gauge 31 of the chlorination furnace 3 is 0.07Mpa (G); opening the exhaust valve 51A of the bin pump A;
(2) opening a bin pump A feeding valve 41A, and enabling the mixture to enter a bin pump A from the mixture bin 1;
(3) after the feeding is finished, closing the exhaust valve 51A of the bin pump A, closing the feeding valve 41A of the bin pump A, and opening the air inlet valve 61A to introduce fluidizing gas to fully fluidize the materials in the bin pump A;
(4) when the pressure of the bin pump A rises to reach a conveying set value of 0.25Mpa (G), a discharge valve 71A of the bin pump A is opened, and the material conveying is started;
(5) opening an exhaust valve 51B of a bin pump B, opening a feeding valve 41B of the bin pump B, enabling the mixture to enter the bin pump B from the mixture bin 1, closing the exhaust valve 51B of the bin pump B and closing a feeding valve 41B of the bin pump B after the feeding is finished, opening an air inlet valve 61B, introducing fluidizing gas to fully fluidize the materials in the bin pump B, increasing the pressure of the bin pump B to reach a conveying set value of 0.25Mpa (G), and maintaining the pressure for later use;
(6) when the pressure of the bin pump A reaches a set value 0.09Mpa (G) for stopping conveying, the ventilation is continued for 4s, the discharge valve 71A of the bin pump A is closed, and the discharge valve 71B of the bin pump B is opened to start feeding;
(7) repeating the steps (1) to (6) to start the next conveying cycle;
(8) when the feeding of the bin pump A and the bin pump B is stopped, the nitrogen valve 81 on the nitrogen pipe 8 is opened at the same time, and the nitrogen pressure is controlled to be 0.25Mpa (G).
Example three:
a method for continuously conveying solid mixed materials into a chlorination furnace comprises the following steps:
(1) the mixture is stored in the mixture bin 1, and the ratio of titanium ore (high titanium slag or rutile), petroleum coke and sodium chloride is 100:33: 1; the conveying amount is set to be 15t/h, and the pressure gauge 31 of the chlorination furnace 3 is 0.09Mpa (G); opening the exhaust valve 51A of the bin pump A;
(2) opening a bin pump A feeding valve 41A, and enabling the mixture to enter a bin pump A from the mixture bin 1;
(3) after the feeding is finished, closing the exhaust valve 51A of the bin pump A, closing the feeding valve 41A of the bin pump A, and opening the air inlet valve 61A to introduce fluidizing gas to fully fluidize the materials in the bin pump A;
(4) when the pressure of the bin pump A rises to reach a conveying set value of 0.3Mpa (G), a discharge valve 71A of the bin pump A is opened, and the material conveying is started;
(5) opening an exhaust valve 51B of a bin pump B, opening a feeding valve 41B of the bin pump B, enabling the mixture to enter the bin pump B from the mixture bin 1, closing the exhaust valve 51B of the bin pump B and closing a feeding valve 41B of the bin pump B after the feeding is finished, opening an air inlet valve 61B, introducing fluidizing gas to fully fluidize the materials in the bin pump B, increasing the pressure of the bin pump B to reach a conveying set value of 0.3Mpa (G), and maintaining the pressure for later use;
(6) when the pressure of the bin pump A reaches a set value 0.11Mpa (G) for stopping conveying, the ventilation is continued for 5s, the discharge valve 71A of the bin pump A is closed, and the discharge valve 71B of the bin pump B is opened to start feeding;
(7) repeating the steps (1) to (6) to start the next conveying cycle;
(8) when the feeding of the bin pump A and the bin pump B is stopped, the nitrogen valve 81 on the nitrogen pipe 8 is opened at the same time, and the nitrogen pressure is controlled to be 0.3Mpa (G).
Claims (9)
1. A system for continuously conveying solid mixed materials into a chlorination furnace is characterized in that: the chlorination furnace comprises a mixture bin, two bin pumps arranged in parallel and a chlorination furnace, wherein the two bin pumps arranged in parallel are respectively marked as a bin pump A and a bin pump B;
the two feeding pipes are connected with a mixture bin and are respectively provided with a feeding valve;
the two exhaust pipes are connected with the mixture bin and are respectively provided with an exhaust valve;
the two air inlet pipes are both connected with a fluidizing air source, and are respectively provided with an air inlet valve;
on two discharging pipes joined the back unified connection chlorination furnace, be equipped with the bleeder valve on two discharging pipes respectively, be equipped with the nitrogen gas pipe on the pipeline after two discharging pipes joined, be equipped with nitrogen gas valve and nitrogen gas manometer on the nitrogen gas pipe.
2. A system for continuously conveying solid mixed materials into a chlorination furnace is characterized in that: the exhaust valve, the feeding valve, the discharging valve and the nitrogen valve are automatic switch valves, and the air inlet valve is an automatic adjusting valve.
3. A system for continuously conveying solid mixed materials into a chlorination furnace is characterized in that: the bin pump pressure gauge, the chlorination furnace pressure gauge and the nitrogen pressure gauge are all electronic pressure gauges.
4. A system for continuously conveying solid mixed materials into a chlorination furnace is characterized in that: the operation pressure of the chlorination furnace is 0.05-0.1Mpa, and the operation temperature is 500-1050 ℃.
5. A method for continuously conveying solid mixed materials into a chlorination furnace is characterized by comprising the following steps:
(1) opening an exhaust valve of the bin pump A;
(2) opening a bin pump A feeding valve, and enabling the mixture to enter a bin pump A from a mixture bin;
(3) after the feeding is finished, closing an exhaust valve of the bin pump A, closing a feeding valve of the bin pump A, opening an air inlet valve and introducing fluidizing gas to fully fluidize the materials in the bin pump A;
(4) when the pressure of the bin pump A rises to reach a conveying set value, a discharge valve of the bin pump A is opened, and the material starts to be conveyed;
(5) opening an exhaust valve of a bin pump B, opening a feed valve of the bin pump B, enabling the mixture to enter the bin pump B from a mixture bin, closing the exhaust valve of the bin pump B and closing the feed valve of the bin pump B after the feeding is finished, opening an air inlet valve, introducing fluidizing gas to fully fluidize the material in the bin pump B, increasing the pressure of the bin pump B to reach a conveying set value, and maintaining the pressure for later use;
(6) when the pressure of the bin pump A reaches a set value for stopping conveying, the ventilation is continued for 3-5s, the discharge valve of the bin pump A is closed, and the discharge valve of the bin pump B is opened to start feeding;
(7) repeating the steps (1) to (6) to start the next conveying cycle;
(8) and when the bin pump A and the bin pump B stop feeding, the nitrogen valve on the nitrogen pipe is opened simultaneously, and certain nitrogen pressure is controlled.
6. A method for continuously conveying solid mixed materials into a chlorination furnace according to claim 5, characterized in that: the solid mixed material is titanium ore, petroleum coke and sodium chloride, the weight percentage is 100:33:1, and the conveying capacity is 10-15 t/h.
7. A method for continuously conveying solid mixed materials into a chlorination furnace according to claim 5, characterized in that: the conveying set value is 0.2-0.4 Mpa.
8. A method for continuously conveying solid mixed materials into a chlorination furnace according to claim 5, characterized in that: the set value for stopping conveying is 0.08-0.12 MPa.
9. A method for continuously conveying solid mixed materials into a chlorination furnace according to claim 5, characterized in that: the nitrogen pressure is 0.2-0.4 Mpa.
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Citations (6)
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US20050217428A1 (en) * | 2002-05-29 | 2005-10-06 | Wataru Kagohashi | Method and device for producing metal powder |
CN203558870U (en) * | 2013-10-29 | 2014-04-23 | 东华工程科技股份有限公司 | Continuous feeding device of fluidizing chlorination furnace |
CN203976420U (en) * | 2014-06-11 | 2014-12-03 | 遵宝钛业有限公司 | A kind of boiling chloridizing furnace automatic feeding device |
CN106082316A (en) * | 2016-08-19 | 2016-11-09 | 云南冶金新立钛业有限公司 | Titanium Dioxide Produced by Chloride Procedure boiling chloridizing furnace feed arrangement |
CN209872393U (en) * | 2019-03-20 | 2019-12-31 | 东华工程科技股份有限公司 | Feeding device of boiling chlorination furnace |
CN215963473U (en) * | 2021-06-30 | 2022-03-08 | 蚌埠中瓷纳米科技有限公司 | System for solid mixed material is carried into chlorination furnace in succession |
-
2021
- 2021-06-30 CN CN202110730329.3A patent/CN113351121A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050217428A1 (en) * | 2002-05-29 | 2005-10-06 | Wataru Kagohashi | Method and device for producing metal powder |
CN203558870U (en) * | 2013-10-29 | 2014-04-23 | 东华工程科技股份有限公司 | Continuous feeding device of fluidizing chlorination furnace |
CN203976420U (en) * | 2014-06-11 | 2014-12-03 | 遵宝钛业有限公司 | A kind of boiling chloridizing furnace automatic feeding device |
CN106082316A (en) * | 2016-08-19 | 2016-11-09 | 云南冶金新立钛业有限公司 | Titanium Dioxide Produced by Chloride Procedure boiling chloridizing furnace feed arrangement |
CN209872393U (en) * | 2019-03-20 | 2019-12-31 | 东华工程科技股份有限公司 | Feeding device of boiling chlorination furnace |
CN215963473U (en) * | 2021-06-30 | 2022-03-08 | 蚌埠中瓷纳米科技有限公司 | System for solid mixed material is carried into chlorination furnace in succession |
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Effective date of registration: 20240202 Address after: No. 8 Jintong Road, Mohekou Industrial Park, Huaishang District, Bengbu City, Anhui Province, 233000 Applicant after: Bengbu Guoti nano material Co.,Ltd. Country or region after: China Address before: 233000 block B, north of Donghai Avenue and east of Longjin Road, Longzihu District, Bengbu City, Anhui Province Applicant before: Bengbu ZHONGCI Nano Technology Co.,Ltd. Country or region before: China |
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