CN114195189B - Preparation process of chromium oxyhydroxide - Google Patents
Preparation process of chromium oxyhydroxide Download PDFInfo
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- CN114195189B CN114195189B CN202111570761.7A CN202111570761A CN114195189B CN 114195189 B CN114195189 B CN 114195189B CN 202111570761 A CN202111570761 A CN 202111570761A CN 114195189 B CN114195189 B CN 114195189B
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- -1 chromium oxyhydroxide Chemical compound 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 142
- 239000007788 liquid Substances 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000706 filtrate Substances 0.000 claims abstract description 13
- 239000000047 product Substances 0.000 claims abstract description 11
- 238000004537 pulping Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000001257 hydrogen Substances 0.000 claims abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- 238000006722 reduction reaction Methods 0.000 claims abstract description 3
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 5
- 239000012043 crude product Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000012452 mother liquor Substances 0.000 claims description 4
- 238000011085 pressure filtration Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- 230000035485 pulse pressure Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910000423 chromium oxide Inorganic materials 0.000 abstract description 2
- 239000012065 filter cake Substances 0.000 description 8
- 238000003825 pressing Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- MOEHVXSVUJUROX-UHFFFAOYSA-M chromium(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Cr+3] MOEHVXSVUJUROX-UHFFFAOYSA-M 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
A preparation process of chromium oxyhydroxide relates to the technical field of separation and purification, and comprises the following steps: step one, solid-liquid separation of slurry: slurry supplied in the sodium chromate solution hydrogen reduction reaction step: crOOH-Na2CrO4-NaOH-H2O; performing primary solid-liquid separation by a filtering slurrying washing tank; step two, preparing a washing solution: the washing liquid of the washing liquid tank comprises filtrate, centrifugate and pure water after filtration and pulping; step three, pulping and washing: washing liquid in the washing liquid tank is respectively added into the filtering slurrying washing tank in sequence according to the set solid-liquid ratio, and the washed slurry is centrifuged by a centrifuge to obtain the product chromium oxyhydroxide. The invention has the beneficial effects that: the produced chromium oxyhydroxide has high purity, adopts countercurrent circulation washing, has small pure water consumption, low production energy consumption, short process route and simple operation, reduces investment and effectively improves the yield and the product purity of the chromium oxide green.
Description
Technical Field
The invention relates to the technical field of separation and purification, in particular to a preparation process of hydroxy chromium oxide.
Background
The existing separation and purification treatment process method of the chromium oxyhydroxide mainly comprises a vacuum belt filter-filter cake leaching process, a plate and frame filter pressing-filter cake washing process and a centrifugal separation-washing process, and has the problems that one device cannot realize the separation-pulping-washing function, the quantity of required centrifugal machines or filter presses and matched washing devices is large, the operation flow is long and complicated, and the continuous and stable operation guarantee is low; automatic operation is not easy to realize, the production capacity is small, and the investment and the occupied area are large; washing water is easy to flow in a short time and uneven in distribution in the leaching process, soluble impurity ions which are carried by the filter material are not easy to remove, and the product purity is low; the matched slurrying tank needs continuous stirring to prevent solid materials from settling, agglomerating and blocking, but can not avoid blockage of a conveying pipeline in the intermittent operation process, and the additional clean water of the process is required to be adopted for replacement cleaning, so that the energy consumption is high, the cost is high, the water consumption is large, the product loss rate is large, and the requirement of the current clean and efficient production process can not be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation process of chromium oxyhydroxide, which aims to solve the problems of high cost and high consumption in the prior art.
The invention provides a preparation process of chromium oxyhydroxide, which mainly comprises a filtration pulping washing tank, a mother liquid tank, a washing liquid tank, an air cannon and an automatic control system;
the preparation process comprises the following steps:
step one, solid-liquid separation of slurry: slurry supplied in the sodium chromate solution hydrogen reduction reaction step: crOOH-Na2CrO4-NaOH-H2O; carrying out primary solid-liquid separation by a filtering slurrying washing tank, removing a large amount of soluble impurity sodium to obtain a chromium hydroxide crude product, recycling one part of filtrate to a mother liquor tank, and recycling the other part of filtrate to the washing tank;
step two, preparing a washing solution: one part of filtrate passes through a washing liquid tank and is pumped to a recovery system by a washing liquid pump, and the other part of filtrate passes through the washing liquid tank and is washed by a filtering slurrying washing tank; the washing liquid of the washing liquid tank comprises filtrate, centrifugate and pure water after filtration and pulping; an inner coil heater is arranged in the washing liquid tank, so that the washing liquid tank heats the washing liquid to 50-80 ℃;
step three, pulping and washing: and (3) adding the obtained crude product of the chromium oxyhydroxide on a filter barrel filter disc in a filter slurrying washing tank in sequence according to a set solid-to-liquid ratio, starting a stirrer in the filter slurrying washing tank to fully slurry the chromium oxyhydroxide, dissolving the dissolved and insoluble impurities carried by the chromium oxyhydroxide crystal groups in solvent water again, removing impurities in the gas pressurizing, dehydrating and filtering process to obtain washed slurry, centrifuging the washed slurry in a centrifuge to obtain the product chromium oxyhydroxide, and centrifuging the centrifugate in the washing tank.
The utility model provides a filter pulp washing jar, includes barrel, filter screen bucket, agitator, the agitator includes motor, (mixing) shaft and stirring vane, be provided with the motor in the middle of the barrel is above, the motor passes through the stirring vane of (mixing) shaft connection, be provided with sight glass viewing aperture, air inlet C, pressure measurement mouth, gas vent, feed inlet and washing water inlet above the barrel respectively, be provided with air inlet A, discharge gate A, liquid level measurement mouth, discharge gate B, air inlet B, manhole and temperature measurement mouth on the barrel lateral wall, be provided with the filtrate export in the middle of the barrel bottom, be provided with filter screen section of thick bamboo in the barrel, the filter screen section of thick bamboo is fixed in the barrel through supporting the flitch.
The working process of the filtering slurrying washing tank is completed by five steps of feeding, pressure filtration, slurrying, pressure filtration and discharging; a filter screen cylinder with a proper mesh number is selected by utilizing a particle size distribution diagram of the chromium oxyhydroxide, so that the entrapment of the chromium oxyhydroxide crystals is realized, and the chromium oxyhydroxide crystals cannot flow into a separated liquid phase through a filter screen; the mechanical force brought by the stirrer is utilized to lead the soluble impurities or other tiny particles which are wrapped by the chromium oxyhydroxide to be carried into the solution for filtration and removal.
The air cannon is connected on filtering slurring washing jar through the pipeline and is connected on air inlet A and air inlet B, on the pipeline through air inlet A and air inlet B extends to the support flitch of filter screen section of thick bamboo, the air cannon can break up loose solid particle settlement hardening form, the paddle locking damage when preventing to start the agitator, the pulse travel time of an air cannon is 0.1 ~ 0.3 seconds, the setting quantity of air cannon is according to filter bottom area, filtering layer thickness, filter material nature, pulse pressure calculation design, must equally divide the interval installation to start in succession according to preset order, this technological scheme prefers 2 air cannons that are 0.5MPa ~ 0.65MPa of symmetrical arrangement pressure.
The washing liquid system is composed of 2 washing liquid tanks, 2 times of washing can be composed of 3 tanks, 3 times of washing can be composed of 4 tanks, and the like, and the washing liquid system is determined according to the target quality requirement of the final slurried washing product, wherein the 3 times of washing are as follows: the tank 1 is a final washing liquid finishing tank, only serves as washing liquid to be recycled and excessively buffered in the process, the tank 2 provides washing liquid for 1-time slurry washing and also serves as a tank for 2-time washing finishing liquid, the tank 3 provides washing liquid for 2-time slurry washing and also serves as a tank for 1-time washing finishing liquid, the tank 4 provides washing liquid for 3-time slurry washing and also serves as a tank for selected washing liquid, the washing liquid can be selected as a solvent for insoluble or indissolvable product crystals, the process scheme is preferably high-purity water, the temperature of the washing liquid can be flexibly selected, and the process scheme is preferably 60+/-5 ℃.
The automatic control system comprises automatic adjustment of air supply pressure in a process scheme boundary region, automatic adjustment of air cannon pressure, automatic action of the air cannon, automatic control of liquid level of each storage tank, automatic adjustment and interlocking control of filtration air pressure, and logic sequential control of an operation method, and can realize one-key start and stop.
The invention has the beneficial effects that: the produced chromium oxyhydroxide has high purity, adopts countercurrent circulation washing, has small pure water consumption, low production energy consumption, larger production capacity of monomer equipment, short process route, simple operation, reduced investment, greatly improved production capacity and product quality, and effectively improved yield and product purity of chromium oxide green.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a block diagram of a filtration slurrying wash tank of the present invention;
in the figure: 1. barrel, 2, (mixing) shaft, 3, filter screen barrel, 4, stirring vane, 5, air inlet A,6, discharge gate A,7, liquid level measurement mouth, 8, filtrate export, 9, support the flitch, 10, discharge gate B,11, air inlet B,12, manhole, 13, temperature measurement mouth, 14, sight glass viewing aperture, 15, air inlet C,16, pressure measurement mouth, 17, motor, 18, gas vent, 19, feed inlet, 20, washing water inlet.
Detailed Description
The embodiment 1, as shown in figure 1, provides a preparation process of chromium oxyhydroxide, wherein main equipment of the process comprises a filtration pulping washing tank, a mother liquid tank, a washing liquid tank and an air cannon;
the preparation process comprises the following steps:
step one, solid-liquid separation of slurry:
(1) Feeding: the vent valve VT01 is opened, the feed valve LCV01 is opened, and the valve LCV01 is automatically closed when the feed level reaches 75%.
(2) And (3) filtering: valve VT01 is closed, mother liquor discharge valve LCV09 is opened, intake valve PCV02 is opened, and pressure pt02=0.55 MPa to 0.65MPa is maintained.
(3) Decompression: after 10min of operation (2), the valves PCV02 and LCV09 are automatically closed, and the valve VT01 is opened to release pressure, resulting in pt02=0 MPa.
(4) And (3) analyzing and detecting that the water content of the filter cake is 6-8% to be qualified, if the water content is higher than the index requirement, increasing the air pressure by 0.1MPa (the filter pressing time is unchanged) or delaying the filter pressing time for 5-10 min (the filter pressing air pressure is unchanged), and selecting optimal reasonable control parameters through the filter pressing air pressure, the filter time and the analysis result to ensure that the water content of the filter cake reaches the technical requirement.
Step two, preparing a washing solution:
(1) If the washing is performed for three times, respectively injecting washing liquid with the amount (the water content is 6% -8%) which is 3.5-4 times of the wet matrix of the washed filter cake into a first washing tank, a second washing tank and a third washing tank;
(2) If the washing is performed for four times, respectively injecting washing liquid with the amount of the wet matrix (the water content is 6% -8%) of the washed filter cake into a first washing tank, a second washing tank, a third washing tank and a fourth washing tank;
(3) If the washing is performed for five times, 2.5 to 3.0 times of washing liquid of the wet matrix quantity (the water content is 6 to 8 percent) of the washed filter cake is respectively injected into the first washing tank, the second washing tank, the third washing tank, the fourth washing tank and the fifth washing tank;
(4) If the washing is performed for six times, 2.0 to 2.5 times of washing liquid of the wet matrix quantity (the water content is 6 to 8 percent) of the washing filter cake is respectively injected into the first washing tank, the second washing tank, the third washing tank, the fourth washing tank, the fifth washing tank and the sixth washing tank.
(5) Starting a coil heater in the washing liquid tank, and heating the washing liquid to 60+/-5 ℃.
Step three, pulping and washing: the following procedure is described for the three slurry wash embodiment.
(1) The method comprises the steps of washing for the first time, opening an exhaust valve VT01, opening a washing liquid outlet valve LCV06, opening an air inlet valve PCV04, automatically closing the valves PCV04 and LCV06 when the liquid level in a washing liquid tank is reduced to 10%, sequentially starting a primary air cannon PCV03a/b, starting a stirrer, enabling a motor to be pulped for 10min at a frequency ranging from 1Hz to 45Hz, automatically lifting the frequency of 1Hz every 4S, opening the exhaust valve VT02, opening a feed valve LCV03, stopping the stirrer and opening the air inlet valve PCV02, wherein the filter pressing air pressure is equal to or slightly smaller than the implementation pressure of the first step, and automatically closing the valve PCV02 and opening the valve VT01 after 10 min.
(2) The method comprises the steps of washing for the second time, opening an exhaust valve VT01, opening a washing liquid outlet valve LCV07 and an intake valve PCV05, when the liquid level of a secondary washing liquid tank is reduced to 10% and is an automatic closing valve PCV05, sequentially starting a primary air cannon PCV03a/b, starting a stirrer, enabling the motor frequency to be 1 Hz-45 Hz, pulping for 10min at each 4S automatic lifting frequency of 1Hz and 45Hz, opening the exhaust valve VT03, opening a feed valve LCV04, stopping the stirrer and opening the intake valve PCV02, and enabling the filter pressing air pressure to be equal to or slightly smaller than the implementation pressure of the first step after 10min, and automatically closing the valve PCV02 and opening the valve VT01.
(3) And washing for the third time, opening an exhaust valve VT01, opening a washing liquid outlet valve LCV08, opening an air inlet valve PCV06, when the liquid level of the two washing liquid tanks is reduced to 10 percent and is an automatic closing valve PCV06, sequentially starting a primary air cannon PCV03a/b, starting a stirrer, starting a motor frequency from 1Hz to 45Hz, automatically lifting the frequency for every 4S to 1Hz, slurrying for 10 minutes at 45Hz, opening a discharge valve LCV11/12, starting a washing completion slurry pump, stopping the stirrer when slurry of the slurrying washing tank to be filtered is emptied, and simultaneously opening an opening valve LCV13 to receive centrifugal mother liquor.
(4) The washing liquid is replenished, the exhaust valve VT05 is opened, the liquid inlet valve (pure water in the scheme) LCV02 is opened, and when the liquid level of the three washing liquid tanks reaches the set index, the liquid inlet valve LCV02 is automatically closed.
The purity of the hydroxy chromium oxide produced by the process of the filtering, slurrying and washing integrated device is high (more than 99.5 percent, na) + ＜200PPm、Cr 6+ ＜50PPm)。
Claims (5)
1. A preparation process of chromium oxyhydroxide is characterized in that: the main equipment comprises a filtering slurrying washing tank, a mother liquid tank, a washing liquid tank, an air cannon and an automatic control system;
the air cannons are connected onto a supporting flower plate of a filter screen cylinder at the bottom of the filtering slurring washing tank through pipelines, loose solid particle settling hardening forms are scattered by the air cannons before the stirrer is started, the pulse travel time of one air cannon is 0.1-0.3 seconds, the setting number of the air cannons is calculated and designed according to the bottom area of the filter, the thickness of the filter layer, the property of the filter material and the pulse pressure, the air cannons are required to be installed at equal intervals, and the air cannons are sequentially started according to a preset sequence, and 2 air cannons with the pressure of 0.5-0.65 MPa are symmetrically arranged in the technical scheme;
the process comprises the following steps:
step one, solid-liquid separation of slurry: slurry supplied in the sodium chromate solution hydrogen reduction reaction step: crOOH-Na2CrO4-NaOH-H2O; performing primary solid-liquid separation under the action of external air pressure in a filtering slurrying washing tank, removing a large amount of soluble impurity sodium to obtain a chromium hydroxide crude product, recycling one part of filtrate to a mother liquor tank, and recycling the other part of filtrate to the washing liquid tank;
step two, preparing a washing solution: one part of filtrate passes through a washing liquid tank and is pumped to a recovery system by a washing liquid pump, and the other part of filtrate passes through the washing liquid tank and is washed by a filtering slurrying washing tank; the washing liquid of the washing liquid tank comprises filtrate, centrifugate and pure water after filtration and pulping; an inner coil heater is arranged in the washing liquid tank, so that the washing liquid tank heats the washing liquid to 50-80 ℃;
step three, pulping and washing: and (3) adding the obtained crude product of the chromium oxyhydroxide on a filter barrel filter disc in a filter slurrying washing tank in sequence according to a set solid-to-liquid ratio, starting a stirrer in the filter slurrying washing tank to fully slurry the chromium oxyhydroxide, dissolving the dissolved and insoluble impurities carried by the chromium oxyhydroxide crystal groups in solvent water again, removing impurities in the gas pressurizing, dehydrating and filtering process to obtain washed slurry, centrifuging the washed slurry in a centrifuge to obtain the product chromium oxyhydroxide, and centrifuging the centrifugate in the washing tank.
2. The process for preparing chromium oxyhydroxide according to claim 1, characterized by: the filtering slurrying washing tank is completed by five steps of feeding, pressure filtration, slurrying, pressure filtration and discharging; a filter screen with a proper mesh number is selected by utilizing a particle size distribution diagram of the chromium oxyhydroxide, so that the entrapment of the chromium oxyhydroxide crystals is realized, and the chromium oxyhydroxide crystals cannot flow into a separated liquid phase through the filter screen; the mechanical force brought by the stirrer is utilized to lead the soluble impurities or other tiny particles which are wrapped by the chromium oxyhydroxide to be carried into the solution for filtration and removal.
3. The process for preparing chromium oxyhydroxide according to claim 1, characterized by: more than 2 washing liquid tanks form a washing liquid system, 3 tanks can form 2 times of washing and 4 tanks can form 3 times of washing.
4. A process for the preparation of chromium oxyhydroxide in accordance with claim 3, wherein: the 3 times of washing are as follows: the tank 1 is a final washing liquid finishing tank, and is only used as a washing liquid recycling excessive buffer storage in the process, the tank 2 is a tank for providing washing liquid for 1-time slurry washing and also used as a tank for 2-time washing finishing liquid, the tank 3 is a tank for providing washing liquid for 2-time slurry washing and also used as a tank for 1-time washing finishing liquid, the tank 4 is a tank for providing washing liquid for 3-time slurry washing and also used as a tank for selected washing liquid, and the washing liquid can be selected as a solvent for insoluble or indissolvable product crystals.
5. The process for preparing chromium oxyhydroxide according to claim 1, characterized by: the automatic control system controls the starting and stopping of the whole process equipment.
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| CN202111570761.7A CN114195189B (en) | 2021-12-21 | 2021-12-21 | Preparation process of chromium oxyhydroxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420422A (en) * | 2012-05-24 | 2013-12-04 | 中国科学院过程工程研究所 | Preparation method of chromic oxyhydroxide |
| CN107902699A (en) * | 2017-11-14 | 2018-04-13 | 中国科学院过程工程研究所 | A kind of decomposition method of continuous pressure self-heating liquid phase oxidation chromite |
| CN109368697A (en) * | 2018-12-18 | 2019-02-22 | 青海省博鸿化工科技股份有限公司 | A kind of chromium oxide and preparation method thereof |
| CN110394138A (en) * | 2019-08-27 | 2019-11-01 | 青海省博鸿化工科技股份有限公司 | A kind of continuous reaction apparatus and application thereof |
| CN210632117U (en) * | 2019-08-27 | 2020-05-29 | 青海省博鸿化工科技股份有限公司 | Continuous reaction device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5636994B2 (en) * | 2011-02-04 | 2014-12-10 | 住友電気工業株式会社 | Method for producing sodium chromite |
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2021
- 2021-12-21 CN CN202111570761.7A patent/CN114195189B/en active Active
Patent Citations (5)
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| CN103420422A (en) * | 2012-05-24 | 2013-12-04 | 中国科学院过程工程研究所 | Preparation method of chromic oxyhydroxide |
| CN107902699A (en) * | 2017-11-14 | 2018-04-13 | 中国科学院过程工程研究所 | A kind of decomposition method of continuous pressure self-heating liquid phase oxidation chromite |
| CN109368697A (en) * | 2018-12-18 | 2019-02-22 | 青海省博鸿化工科技股份有限公司 | A kind of chromium oxide and preparation method thereof |
| CN110394138A (en) * | 2019-08-27 | 2019-11-01 | 青海省博鸿化工科技股份有限公司 | A kind of continuous reaction apparatus and application thereof |
| CN210632117U (en) * | 2019-08-27 | 2020-05-29 | 青海省博鸿化工科技股份有限公司 | Continuous reaction device |
Non-Patent Citations (1)
| Title |
|---|
| Formation of Cr(VI) compounds during the thermal decomposition of amorphous chromium hydroxide;Guangye Wei et al.;《J Therm Anal Calorim》;第741–745页 * |
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