CN110627102A - Micro-reaction device for preparing nano calcium carbonate - Google Patents
Micro-reaction device for preparing nano calcium carbonate Download PDFInfo
- Publication number
- CN110627102A CN110627102A CN201911055203.XA CN201911055203A CN110627102A CN 110627102 A CN110627102 A CN 110627102A CN 201911055203 A CN201911055203 A CN 201911055203A CN 110627102 A CN110627102 A CN 110627102A
- Authority
- CN
- China
- Prior art keywords
- calcium carbonate
- tank
- pipe
- micro
- nano calcium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- 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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/18—Carbonates
- C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
A micro-reaction device for preparing nano calcium carbonate comprises a constant-temperature water tank, a membrane reactor and CO2A storage tank, a stirring tank, a washing filter and a dryer; the membrane reactor is arranged in the constant-temperature water tank and comprises an outer pipe and an inner pipe sleeved on the inner side of the outer pipe, an annular gap is reserved between the inner pipe and the outer pipe, continuous phase gas inlets are symmetrically arranged on two sides of the outer pipe, a dispersed phase liquid inlet is arranged at the front end of the inner pipe, the pipe wall in the middle of the inner pipe is a microporous wall, micropores are uniformly distributed on the microporous wall, and a reaction product outlet is arranged at the rear end of the inner pipe; the continuous phase gas inlet is connected with CO2The storage tank, the dispersed phase liquid inlet and the reaction product outlet are both connected with the stirring tank, the stirring tank is connected with the water washing filter, and the solid outlet of the water washing filter is connected with the dryer; the liquid outlet of the water washing filter is connected with the stirring tank. Conversion and yield of the reaction of the inventionThe rate is high, the obtained nano calcium carbonate product has narrow particle size distribution, the product quality is stable, the industrial production can be realized, and the energy consumption is low.
Description
Technical Field
The invention belongs to the technical field of nano calcium carbonate preparation, and particularly relates to a micro-reaction device for preparing nano calcium carbonate.
Background
The nano calcium carbonate is a new product developed in the later 80 years, is mainly used for the aspects of coating, rubber, printing ink, adhesive, paper making, cosmetics, medicine and the like, has the particle size range within 100nm, and is mainly characterized by small particle size, uniform particle size, large specific surface area and better performance than common calcium carbonate, and the preparation method of the calcium carbonate has a physical method and a chemical method.
The chemical method is the main production method of nano calcium carbonate.
Chemical methods include carbonization and double decomposition.
(1) The double decomposition method is mainly characterized in that water-soluble calcium salt and water-soluble carbonate react under proper technological conditions, and the required nano calcium carbonate product is prepared by precipitation through the liquid-solid phase reaction. The method can prepare the amorphous calcium carbonate product with different shapes and sizes, spherical calcium carbonate and the like, the particle size of which is less than or equal to 0.1 mu m, the specific surface area of which is large, and the solubility of which is good by controlling the concentration, the temperature and the feeding rate of reactants and the supersaturation degree of the product calcium carbonate and adding proper additives, and the like, and has high purity and good whiteness. However, the products of different crystal forms of nano calcium carbonate prepared by the double decomposition method have higher cost, are not easy to remove a large amount of chloride ions adsorbed on the surface of the nano calcium carbonate in the formation process of the calcium carbonate, need to consume a large amount of time and wash with water, and are rarely used at home and abroad.
(2) The carbonization method is characterized in that high-quality limestone is used as a raw material, calcium oxide and kiln gas containing carbon dioxide are obtained through calcination, calcium oxide and water are used for generating calcium hydroxide suspension, then purified kiln gas is introduced, calcium carbonate precipitates are generated through the carbonization method, and the nano calcium carbonate product is obtained through dehydration, drying and crushing.
The product obtained by the method has good quality and low cost, and the nano-scale calcium carbonate prepared at home and abroad at present mainly adopts the method, and the carbonization method can be divided into an intermittent bubbling carbonization method, an intermittent stirring carbonization method, a continuous spraying carbonization method, a supergravity carbonization method and the like according to the contact mode of carbon dioxide gas and calcium hydroxide suspension.
The intermittent bubbling carbonization method has the advantages of small investment on production equipment and simple operation, and has the defects of low production efficiency, poor gas-liquid contact, long carbonization time, rough and uneven grain diameter and wide grain size distribution;
the intermittent stirring carbonization method has poor repeatability and wider particle size distribution due to more factors influencing the particle size of the product and difficult control in the production process;
the continuous spray carbonization method has high efficiency and good economic benefit, can realize automatic large-scale production, and has the defects of large equipment investment;
the super-gravity carbonization method has the advantages of short carbonization time, small reaction device, easy operation, low investment, high product purity and stable quality, but has high equipment investment, low production capacity and low utilization rate of CO 2.
Disclosure of Invention
The invention aims to provide a micro-reaction device for preparing nano calcium carbonate, which has a simple structure and a good using effect.
In order to solve the technical problems, the invention provides the following technical scheme: a micro-reaction device for preparing nano calcium carbonate comprises a constant-temperature water tank, a membrane reactor and CO2A storage tank, a stirring tank, a washing filter and a dryer;
a temperature sensor, a temperature controller and a heating element are arranged in the constant-temperature water tank, the temperature sensor collects the temperature in the constant-temperature water tank, and the temperature controller controls the heating element to work;
the membrane reactor is arranged in the constant-temperature water tank and comprises an outer pipe and an inner pipe sleeved on the inner side of the outer pipe, an annular gap is reserved between the inner pipe and the outer pipe, and the two sides of the outer pipe are symmetricalA continuous phase gas inlet is arranged, a dispersed phase liquid inlet is arranged at the front end of the inner tube, the tube wall in the middle of the inner tube is a microporous wall, micropores are uniformly distributed on the microporous wall, and a reaction product outlet is arranged at the rear end of the inner tube; the continuous phase gas inlet is connected with CO2The storage tank, the dispersed phase liquid inlet and the reaction product outlet are both connected with the stirring tank, the stirring tank is connected with the water washing filter, and the solid outlet of the water washing filter is connected with the dryer; the liquid outlet of the water washing filter is connected with the stirring tank.
The radial distance of the annular gap is 0.1 ~ 10mm, and the aperture of the micropore is 5 multiplied by 10-5~ 0.2.2 mm, the aperture ratio of the microporous wall is 3% -60%, and the length of the microporous wall is 10-35 mm.
A PH value measuring instrument is arranged in the stirring tank.
The continuous phase gas inlet is connected with CO through a gas pipeline2The storage tank and the gas pipeline are provided with a flowmeter and a valve.
The membrane reactor has at least two.
The liquid outlet of the washing filter is connected with a temporary storage tank, and the outlet of the temporary storage tank is connected with a stirring tank.
A stirring shaft is arranged in the stirring tank, and an upper stirring blade and a lower stirring blade positioned below the upper stirring blade are arranged on the stirring shaft.
The lower part is provided with first drain pipe in the agitator tank, is equipped with the material pump on the first drain pipe, and the exit linkage washing filter of material pump.
And a second liquid outlet pipe is further arranged at the inner middle lower part of the stirring tank, a advection pump is arranged on the second liquid outlet pipe, and an outlet of the advection pump is connected with a dispersive liquid inlet.
Through the technical scheme, the invention has the beneficial effects that: the device can better solve the problems of short gas-liquid contact time, low conversion rate, uneven concentration distribution, low yield of reaction products, poor product quality, uneven particle agglomeration and the like of the conventional reaction device for preparing the nano calcium carbonate; the parallel membrane reactors ensure high material mixing efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a membrane reactor configuration.
Detailed Description
A micro-reaction device for preparing nano calcium carbonate, as shown in fig. 1 and 2, comprising a constant temperature water tank 1, wherein the constant temperature water tank 1 can provide a constant temperature environment for reaction.
A temperature sensor 10 (with the model of DS18B 20), a temperature controller and a heating element 3 are arranged in the constant-temperature water tank 1, the temperature sensor 10 collects the temperature in the constant-temperature water tank 1, and the temperature controller controls the heating element 3 to work. Wherein, the temperature controller includes singlechip and relay drive circuit, and the singlechip model is AT89S 51. The signal output end of the temperature sensor 10 is connected with the signal input end of the single chip microcomputer, the signal output end of the single chip microcomputer is connected with the relay driving circuit, the relay driving circuit drives the normally open contact of the relay to be closed or opened, and the normally open contact of the relay is connected between the heating element 3 and the power supply in series.
During the work, temperature sensor 10 gathers the temperature in the constant temperature basin 1 to the temperature controller is transmitted to the temperature that will gather, and the temperature controller is compared received temperature and threshold value, and when being less than the threshold value, temperature controller output signal makes the normally open contact closure of relay, thereby makes the power supply for heating element 3 power supplies, and heating element 3 work heats the temperature in the constant temperature basin 1. When the temperature of gathering is higher than the threshold value, temperature controller output signal makes the normally open contact disconnection of relay to stop the power and supply power for heating element 3, wherein heating element 3 select the heater strip can.
Temperature sensor 10 gathers temperature signal to temperature signal transmission to the singlechip that will gather, the singlechip is according to the temperature signal output signal that receives to relay drive circuit, and relay drive circuit drives the normally open contact action of relay, thereby decides whether the disconnection of power and equipment is mature prior art.
The constant temperature water tank 1 is internally provided with 3 membrane reactors 2 connected in parallel, and in the embodiment, the 3 membrane reactors 2 are selected to improve the working efficiency. The membrane reactor 2 comprises an outer tube 21 and an inner tube 19 sleeved on the inner side of the outer tube 21, wherein the inner tube 19 is connected with the outer tube 21 through a flange 22. An annular gap 24 is reserved between the inner pipe 19 and the outer pipe 21, continuous phase gas inlets 23 are symmetrically arranged on two sides of the outer pipe 21, a dispersed phase liquid inlet 18 is arranged at the front end of the inner pipe 19, a microporous wall 20 is arranged on the pipe wall in the middle of the inner pipe 19, micropores are uniformly distributed on the microporous wall 20, and a reaction product outlet 25 is arranged at the rear end of the inner pipe 19.
The dimensions of the membrane reactor 2 are such that the radial spacing of the annular gap 24 is 0.1 ~ 10mm, preferably 1mm, and the pore size of the micropores is 5X 10-5~ 0.2.2 mm, 1X 10 was chosen-5mm, 1mm can be used; the opening ratio of the microporous wall 20 is 3% to 60%, preferably 10%; the length of the microporous wall 20 is 10 to 35mm, preferably 20 mm.
The continuous phase gas inlet 23 is connected with CO2The storage tank 9, the substantially continuous phase gas inlet 23 is connected with CO through a gas pipeline2And a flowmeter 8 and a valve are arranged on the storage tank 9 and the gas pipeline. The valve is arranged to facilitate control of the slave CO2CO from storage tank 9 into membrane reactor 22And the flow meter 8 can look at the slave CO in real time2CO from storage tank 9 into membrane reactor 22The flow rate of (c).
The reaction product outlets 25 are all connected with the stirring tank 5, a first liquid outlet pipe is arranged at the middle lower part in the stirring tank 5, a material pump 12 is arranged on the first liquid outlet pipe, the material pump 12 is a commercially available product, and the material pump 12 with the model number of NYP in Podocon commercial pump manufacturing factory can be selected. The outlet of the material pump 12 is connected with a washing filter 13, the washing filter 13 is a product sold in the market, and the model of the washing filter 13 is selected from equipment manufactured by Jeokay Industrial Equipment Co., Ltd.
A solid outlet of the water washing filter 13 is connected with a dryer 14, the dryer 14 is a commercial product, and the dryer 14 with the model number of SH-6P produced by Guangzhou conservation science and technology Limited is selected; meanwhile, a liquid outlet of the water washing filter 13 is connected with the temporary storage tank 7, and an outlet of the temporary storage tank 7 is connected with the stirring tank 5. The temporary storage tank 7 is arranged in the embodiment, so that the liquid can be recycled, and meanwhile, the interference of the entering liquid to the stirring tank 5 can be reduced by introducing the liquid into the stirring tank 5 after passing through the temporary storage tank 7.
A PH value measuring instrument 11 is arranged in the stirring tank 5, the PH value measuring instrument 11 is a commercially available product, and the PH value measuring instrument 11 which is produced by Hangzhou union testing automation technology limited and has the model of SIN-pH6.0 is selected. The PH value of the liquid in the stirring tank 5 can be measured by the PH value measuring instrument 11, and the reaction stop time can be known in time.
A stirring shaft 16 is provided in the stirring tank 5, and an upper stirring blade 15 and a lower stirring blade 17 located below the upper stirring blade 15 are provided on the stirring shaft 16. The upper stirring blade 15 and the lower stirring blade 17 are both vertically arranged on the stirring shaft 16. The arrangement of the upper stirring blade 15 and the lower stirring blade 17 can improve the stirring efficiency and the stirring effect of the liquid in the stirring tank 5. The motor 6 is connected to the stirring shaft 16, the output shaft of the motor 6 is in transmission connection with the stirring shaft 16, when the stirring machine works, the motor 6 drives the stirring shaft 16 to rotate, and the stirring shaft 16 drives the upper stirring blade 15 and the lower stirring blade 17 to rotate.
A second liquid outlet pipe is arranged at the middle lower part in the stirring tank 5, a constant flow pump 4 is arranged on the second liquid outlet pipe, and an outlet of the constant flow pump 4 is connected with a dispersive liquid inlet.
In operation, the volume fraction of CO is not less than 30%2Gas enters the outer tube 21 from a continuous phase gas inlet 23, and the mass fraction of the gas is 10 to 30 percent of Ca (OH)2The solution enters the membrane reactor 2 from the disperse phase liquid inlet 18 of the inner pipe 19 for reaction, CO2The flow is controlled by a flow meter 8 and a valve, Ca (OH)2The solution is pumped into a dispersive liquid inlet from a stirring tank 5 through a constant flow pump 4; the reaction temperature is initially 15-20 ℃, and the process temperature is not more than 40 ℃; the reaction product enters the stirring tank 5 from a reaction product outlet 25; the pH value of the stirring tank 5 is measured by a pH value measuring instrument 11, and when the pH value reaches 7.0, gas and solution are stopped to be introduced, so that the reaction is finished; pumping the reaction product into a washing filter 13 by a material pump 12 for filtering and washing, and drying by a dryer 14 to obtain a nano calcium carbonate product; the filtrate and the washing liquid of the water washing filter 13 enter a temporary storage tank 7, and Ca (OH) is added2And (3) preparing a 10-30% solution, adding the solution into the stirring tank 5, and recycling.
The reaction device for preparing the nano calcium carbonate uses the membrane reactor 2 as a reaction unit for symmetrical feeding, so that CO is introduced2Gas and Ca (OH)2The solution is fully contacted, the reaction conversion rate and the yield are high,the obtained nano calcium carbonate product has narrow particle size distribution, stable product quality, low energy consumption and capability of realizing industrial production.
Claims (9)
1. A micro-reaction device for preparing nano calcium carbonate is characterized in that: comprises a constant temperature water tank, a membrane reactor and CO2A storage tank, a stirring tank, a washing filter and a dryer;
a temperature sensor, a temperature controller and a heating element are arranged in the constant-temperature water tank, the temperature sensor collects the temperature in the constant-temperature water tank, and the temperature controller controls the heating element to work;
the membrane reactor is arranged in the constant-temperature water tank and comprises an outer pipe and an inner pipe sleeved on the inner side of the outer pipe, an annular gap is reserved between the inner pipe and the outer pipe, continuous phase gas inlets are symmetrically arranged on two sides of the outer pipe, a dispersed phase liquid inlet is arranged at the front end of the inner pipe, the pipe wall in the middle of the inner pipe is a microporous wall, micropores are uniformly distributed on the microporous wall, and a reaction product outlet is arranged at the rear end of the inner pipe; the continuous phase gas inlet is connected with CO2The storage tank, the dispersed phase liquid inlet and the reaction product outlet are both connected with the stirring tank, the stirring tank is connected with the water washing filter, and the solid outlet of the water washing filter is connected with the dryer; the liquid outlet of the water washing filter is connected with the stirring tank.
2. The micro-reaction device for preparing nano calcium carbonate according to claim 1, wherein the radial distance of the annular gap is 0.1 ~ 10mm, and the pore diameter of the micro-pores is 5 x 10mm-5~ 0.2.2 mm, the aperture ratio of the microporous wall is 3% -60%, and the length of the microporous wall is 10-35 mm.
3. The micro-reaction device for preparing nano calcium carbonate according to claim 2, wherein: a PH value measuring instrument is arranged in the stirring tank.
4. The micro-reaction device for preparing nano calcium carbonate according to claim 3, wherein: the continuous phase gas inlet is connected with CO through a gas pipeline2The storage tank and the gas pipeline are provided with a flowmeter and a valve.
5. The micro-reaction device for preparing nano calcium carbonate according to claim 4, wherein: the membrane reactor has at least two.
6. The micro-reaction device for preparing nano calcium carbonate according to claim 5, wherein: the liquid outlet of the washing filter is connected with a temporary storage tank, and the outlet of the temporary storage tank is connected with a stirring tank.
7. The micro-reaction device for preparing nano calcium carbonate according to claim 6, wherein: a stirring shaft is arranged in the stirring tank, and an upper stirring blade and a lower stirring blade positioned below the upper stirring blade are arranged on the stirring shaft.
8. The micro-reaction device for preparing nano calcium carbonate according to any one of claims 1 to 7, characterized in that: the lower part is provided with first drain pipe in the agitator tank, is equipped with the material pump on the first drain pipe, and the exit linkage washing filter of material pump.
9. The micro-reaction device for preparing nano calcium carbonate according to claim 8, wherein: and a second liquid outlet pipe is further arranged at the inner middle lower part of the stirring tank, a advection pump is arranged on the second liquid outlet pipe, and an outlet of the advection pump is connected with a dispersive liquid inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911055203.XA CN110627102A (en) | 2019-10-31 | 2019-10-31 | Micro-reaction device for preparing nano calcium carbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911055203.XA CN110627102A (en) | 2019-10-31 | 2019-10-31 | Micro-reaction device for preparing nano calcium carbonate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110627102A true CN110627102A (en) | 2019-12-31 |
Family
ID=68976776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911055203.XA Pending CN110627102A (en) | 2019-10-31 | 2019-10-31 | Micro-reaction device for preparing nano calcium carbonate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110627102A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114380315A (en) * | 2021-09-22 | 2022-04-22 | 湖南新绿方药业有限公司 | Purification method and production equipment of medicinal calcium carbonate |
| CN115286028A (en) * | 2022-05-12 | 2022-11-04 | 四川大学 | Preparation method and device for synthesizing high-dispersion nano calcium carbonate without using additive |
-
2019
- 2019-10-31 CN CN201911055203.XA patent/CN110627102A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114380315A (en) * | 2021-09-22 | 2022-04-22 | 湖南新绿方药业有限公司 | Purification method and production equipment of medicinal calcium carbonate |
| CN114380315B (en) * | 2021-09-22 | 2024-01-26 | 湖南新绿方药业有限公司 | Purification method and production equipment of medicinal calcium carbonate |
| CN115286028A (en) * | 2022-05-12 | 2022-11-04 | 四川大学 | Preparation method and device for synthesizing high-dispersion nano calcium carbonate without using additive |
| CN115286028B (en) * | 2022-05-12 | 2023-12-15 | 四川大学 | Preparation method and device for synthesizing high-dispersion nano calcium carbonate without using additive |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103663527B (en) | The preparation method of cubic ultra-fine calcium carbonate particle | |
| JP4537379B2 (en) | Process and apparatus for producing precipitated silica from rice husk ash | |
| CN103011226B (en) | A kind of preparation method of nano-calcium carbonate of coring and increment proceed step by step | |
| CN102923794B (en) | Method for continuously compounding high-purity alkali nickel carbonate | |
| CN108046278B (en) | Method for preparing high-specific-surface-area silicon dioxide by tubular continuous flow method | |
| CN110627102A (en) | Micro-reaction device for preparing nano calcium carbonate | |
| CN103693670B (en) | Production method of calcium sulphate dehydrate and production device thereof | |
| CN107910550A (en) | A kind of preparation method of continous way nickel cobalt aluminium ternary precursor | |
| CN108033475A (en) | A kind of method that micro- reaction prepares nano-calcium carbonate | |
| CN104556174B (en) | A kind of impact flow reactor | |
| CN103588252B (en) | A kind of device and method preparing iron oxide yellow | |
| CN210973907U (en) | Micro-reaction device for preparing nano calcium carbonate | |
| CN110420613A (en) | Lithium carbonate reactor | |
| CN109665549A (en) | A kind of technique preparing calcium aluminum hydrotalcite using carbon dioxide | |
| CN101214993B (en) | Preparation method for nanometer zinc oxide | |
| CN106241816B (en) | A kind of preparation method of silica dioxide delustring agent | |
| CN106673044A (en) | Nano barium sulfate aggregate and preparation method thereof | |
| CN104671263A (en) | A pseudoboehmite preparing method | |
| CN107814404A (en) | A kind of production method of cube nano-calcium carbonate | |
| CN108101091B (en) | Method and device for producing calcium carbonate by dynamic carbonization method | |
| CN205575669U (en) | Preparation nano calcium carbonate's device | |
| CN113788501B (en) | Method for preparing cobalt oxyhydroxide | |
| CN108178178A (en) | A kind of method for preparing small particle basic carbonate cerium | |
| CN101987926B (en) | Method for preparing nano-level active calcium carbonate for rubber and plastic | |
| CN204173931U (en) | A kind of device being applied to the washing of preparing titanium white through chlorination process flour flow design workshop section |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 463400 no.439, east section of Zhonghua Avenue, Yicheng District, Zhumadian City, Henan Province Applicant after: HENAN JUNHUA DEVELOPMENT Co.,Ltd. Address before: 463400 shanghecheng e-commerce operation center, east of Dexin Road, Pingyu County, Zhumadian City, Henan Province Applicant before: HENAN JUNHUA DEVELOPMENT Co.,Ltd. |