CN114632344A - Copper sulfate continuous crystallization system - Google Patents
Copper sulfate continuous crystallization system Download PDFInfo
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- CN114632344A CN114632344A CN202210296079.1A CN202210296079A CN114632344A CN 114632344 A CN114632344 A CN 114632344A CN 202210296079 A CN202210296079 A CN 202210296079A CN 114632344 A CN114632344 A CN 114632344A
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- copper sulfate
- mother liquor
- heat exchanger
- cyclone
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- 229910000365 copper sulfate Inorganic materials 0.000 title claims abstract description 65
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 title claims abstract description 65
- 238000002425 crystallisation Methods 0.000 title claims abstract description 35
- 230000008025 crystallization Effects 0.000 title claims abstract description 35
- 239000012452 mother liquor Substances 0.000 claims abstract description 74
- 239000013078 crystal Substances 0.000 claims abstract description 54
- 238000011001 backwashing Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000010992 reflux Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 235000011152 sodium sulphate Nutrition 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000004781 supercooling Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OWNRRUFOJXFKCU-UHFFFAOYSA-N Bromadiolone Chemical compound C=1C=C(C=2C=CC(Br)=CC=2)C=CC=1C(O)CC(C=1C(OC2=CC=CC=C2C=1O)=O)C1=CC=CC=C1 OWNRRUFOJXFKCU-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 244000021273 Peumus boldus Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000007701 flash-distillation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0063—Control or regulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G3/00—Compounds of copper
- C01G3/10—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G5/00—Compounds of silver
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention discloses a copper sulfate continuous crystallization system, which comprises a crystallizer, a heat exchanger, an axial flow pump, a condenser, a cyclone, a centrifugal machine, a mother liquor tank and a mother liquor reflux pump, wherein the crystallizer is arranged on the top of the crystallizer; a circulating discharge port and a circulating feed port of the crystallizer are respectively connected with a heat exchanger, an axial flow pump is arranged on a pipeline, the heat exchanger is used for cooling the copper sulfate solution, and the axial flow pump is used for providing power for the circulation of the copper sulfate solution; the steam outlet of the crystallizer is connected with a condenser; a discharge port of an elutriation leg of the crystallizer is connected with a swirler, a crystal-containing mother liquor outlet of the swirler is connected with a centrifuge, and a clear mother liquor outlet of the swirler and a clear mother liquor outlet of the centrifuge are respectively connected with a mother liquor tank; the outlet of the mother liquor tank is connected with the back washing feed inlet of the elutriation leg of the crystallizer through a mother liquor reflux pump. Compared with the prior art, the invention greatly improves the production efficiency, reduces the energy consumption, reduces the occupied space of equipment and reduces the production cost, and the produced copper sulfate crystal grains have strong grain diameter consistency and high crystal bulk density.
Description
Technical Field
The invention relates to a copper sulfate continuous crystallization system.
Background
Copper sulfate is one of more important copper salts, has extremely wide application in the aspects of electroplating, printing and dyeing, pigments, pesticides and the like, is one of indispensable chemical raw materials for national economic development, is a mixed solution of copper sulfate and lime milk as an inorganic pesticide boldo liquid, is a good bactericide, and can be used for preventing and treating diseases of various crops. With the rapid development of national economy, the usage of copper sulfate is becoming wide, the price is sharply increased, and the market presents a situation of short supply and demand. The traditional copper sulfate production method is that evaporation concentration is firstly carried out to reach or approach the saturation concentration of copper sulfate, then a large number of crystallization reaction kettles are used for cooling and crystallizing in batches, the production is discontinuous, and time and labor are wasted. Therefore, how to reduce the production cost and improve the productivity is a technical problem to be solved urgently by copper sulfate production enterprises.
Disclosure of Invention
In order to overcome the defects of low production efficiency and high cost of the existing copper sulfate crystal, the invention provides a copper sulfate continuous crystallization system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a copper sulfate continuous crystallization system is characterized in that: the copper sulfate continuous crystallization system comprises a crystallizer, a heat exchanger, an axial flow pump, a condenser, a swirler, a centrifuge, a mother liquor tank and a mother liquor reflux pump;
the circulation discharge port and the circulation feed port of the crystallizer are respectively connected with a heat exchanger, an axial flow pump is arranged on a pipeline, the heat exchanger is used for cooling the copper sulfate solution, and the axial flow pump is used for providing power for the circulation of the copper sulfate solution;
the steam outlet of the crystallizer is connected with a condenser;
a discharge port of an elutriation leg of the crystallizer is connected with a cyclone, a crystal-containing mother liquor outlet of the cyclone is connected with a centrifugal machine, and the cyclone and a clear mother liquor outlet of the centrifugal machine are respectively connected with a mother liquor tank;
the outlet of the mother liquor tank is connected with the back washing feed inlet of the elutriation leg of the crystallizer through a mother liquor reflux pump.
Preferably, when the number of the heat exchangers is one, the circulation discharge port of the crystallizer, the axial flow pump, the heat exchanger and the circulation feed port of the crystallizer are sequentially connected, or the circulation discharge port of the crystallizer, the heat exchanger, the axial flow pump and the circulation feed port of the crystallizer are sequentially connected;
when the number of the heat exchangers is two, the circulating discharge hole of the crystallizer, the first heat exchanger, the axial-flow pump, the second heat exchanger and the circulating feed hole of the crystallizer are sequentially connected.
Preferably, the outlet of the axial flow pump is connected with the back washing feed inlet of the elutriation leg of the crystallizer.
Preferably, the discharge port of the washing leg is positioned on the side wall of the washing leg, the back-washing feed port of the washing leg is positioned at the tail end of the washing leg, and the washing leg is positioned in the center of the bottom of the crystallizer.
Preferably, the crystallizer is an Olso crystallizer, a DTB crystallizer or an FC crystallizer.
Preferably, the crystallizer comprises a vapor-liquid separation chamber positioned at the upper part and a crystal growing chamber positioned at the lower part, the vapor-liquid separation chamber is communicated with the crystal growing chamber through a downcomer, the circulating discharge port is positioned in the crystal growing chamber, and the copper sulfate solution inlet and the circulating feed port are positioned in the vapor-liquid separation chamber.
Preferably, the copper sulfate continuous crystallization system is provided with a vacuum pump, and the vacuum pump is connected with a condenser and used for vacuumizing the crystallizer.
Preferably, the discharge port of the elutriation leg of the crystallizer is connected with the cyclone through a discharge pump.
The method for producing the copper sulfate crystal by adopting the copper sulfate continuous crystallization system comprises the following steps:
(1) delivering the hot copper sulfate solution to a crystallizer;
(2) circularly sending the copper sulfate solution in the crystallizer into a heat exchanger for cooling;
(3) feeding the steam in the crystallizer into a condenser for condensation treatment;
(4) sequentially feeding mother liquor containing sodium sulfate crystals in a crystallizer into a cyclone and a centrifugal machine, and separating to obtain copper sulfate crystals with the water content lower than 8%, wherein the content of the mother liquor crystals entering the cyclone is 8% -17%, the content of clear mother liquor discharged from the cyclone accounts for 50% -80% of the mother liquor entering the cyclone, and the content of the mother liquor crystals entering the centrifugal machine is 35% -60%;
(5) and back washing the washing legs by using clear mother liquor discharged by a cyclone and a centrifugal machine.
Preferably, the crystallizer is under vacuum during production of copper sulfate crystals.
Advantageous effects
Compared with the problems of high energy consumption, low yield, extremely uneven crystal material degree distribution, obvious crystal aggregation effect, more virtual crystals, low accumulated density, large crystal quality difference of each production batch and the like in the existing copper sulfate crystal production, the continuous crystallization system can replace a plurality of original batch or dozens of original batch crystallization devices, greatly improves the production efficiency, reduces the energy consumption, reduces the occupied space of equipment, reduces the production cost, and produces copper sulfate crystal grains with strong grain diameter consistency and high crystal stacking density.
Drawings
FIG. 1 is a schematic view of a copper sulfate continuous crystallization system apparatus according to the present invention;
wherein, 1-mother liquid reflux pump; 2-mother liquor tank; 3-axial flow pump; 4-a heat exchanger; 5-a crystallizer; 6-a discharge pump; 7-a swirler; 8-a centrifuge; 9-a condenser; 10-a condensate drain pump; 11-vacuum pump.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The clear mother liquor of the present invention refers to a mother liquor containing no crystals or a small amount of crystals.
Example 1
As shown in figure 1, the copper sulfate continuous crystallization system mainly comprises a crystallizer 5, a heat exchanger 4, an axial flow pump 3, a condenser 9, a cyclone 7, a centrifuge 8, a mother liquor tank 2 and a mother liquor reflux pump 1.
The crystallizer may be selected from conventional Olso (fluidized bed type) crystallizer, DTB (shielded type) crystallizer or FC (forced circulation type) crystallizer.
The embodiment adopts an improved Olso crystallizer, which comprises a vapor-liquid separation chamber 5-6 positioned at the upper part and a crystal growing chamber 5-7 positioned at the lower part, wherein the vapor-liquid separation chamber is communicated with the crystal growing chamber through a funnel-shaped downcomer 5-8, a copper sulfate liquid inlet and a circulating feed inlet 5-2 of the crystallizer are both positioned in the vapor-liquid separation chamber, a circulating discharge port 5-3 of the crystallizer is positioned in the crystal growing chamber, and the top of the crystallizer is provided with a steam outlet 5-1. The elutriation leg (or salt leg) of the crystallizer is centrally located at the bottom of the crystallizer.
The discharge port 5-4 of the washing leg is positioned on the side wall of the washing leg, and the back washing feed port 5-5 of the washing leg is positioned at the tail end of the washing leg, so that the washing leg has the washing function while discharging. The mother liquor flow of the back washing feed inlet of the washing legs is controlled, the washing efficiency can be adjusted, and the crystal material to be discharged can be settled near the discharge outlet of the washing legs.
Compared with the traditional Olso crystallizer, the Olso crystallizer of the invention changes the traditional two-body structure into a single-body structure, enhances the structural stability of the crystallizer, is convenient for processing and manufacturing, and reduces the equipment investment cost; the washing legs are changed from two sides to the central position, so that the slow flow area at the bottom is reduced, and the discharge efficiency is improved.
The crystallizer is made of titanium or dual-phase steel 2205.
The heat exchanger adopts a tubular heat exchanger, a circulating discharge port and a circulating feed port of the crystallizer are respectively connected with the heat exchanger, and an axial flow pump 3 arranged on the pipeline is matched to form an external circulating system, so that copper sulfate solution (mother liquor) is subjected to heat exchange with a cooling medium in the heat exchanger.
The axial-flow pump can be controlled by a frequency converter to adjust the circulating flow of the copper sulfate solution, so that the supercooling degree in the crystallizer can be more accurately adjusted, and the crystallization rate of the system can be controlled.
The number of the heat exchangers can be one or two. The two heat exchangers are arranged to facilitate the reduction of the flow rate of the axial flow pump.
As shown in figure 1, the heat exchanger is two heat exchangers, a feeding port and a discharging port of a first heat exchanger 4-1 are respectively connected to a circulating discharging port 5-3 of the crystallizer and an inlet 3-1 of an axial flow pump, a feeding port and a discharging port of a second heat exchanger 4-2 are respectively connected to an outlet 3-2 of the axial flow pump and a circulating feeding port 5-2 of the crystallizer, and an outlet 3-2 of the axial flow pump is simultaneously connected with a back washing feeding port 5-5 of an elutriation leg of the crystallizer. The cooling water outlet and the cooling water inlet of the two heat exchangers are respectively connected with a cooling water system. The connecting pipeline of the axial flow pump and the back washing port of the washing leg is provided with valves which can adjust the flow, such as an automatic regulating valve or a ball valve.
A steam inlet 9-1 of the condenser is connected with a steam outlet 5-1 of the crystallizer, a cooling water inlet 9-3 and a cooling water outlet 9-2 of the condenser are respectively connected with a cooling water system, and a condensate outlet 9-4 of the condenser is connected with a condensate discharge pump 10.
The condensate outlet 9-4 of the condenser is also connected with a vacuum pump 11, and the non-condensable gas is discharged by the vacuum pump and vacuumized for the crystallizer so as to ensure that the crystallization system is in a high vacuum state. The vacuum pump can also be controlled by a frequency converter to adjust the vacuum degree for controlling the crystallization temperature.
The condenser is a plate condenser (or a surface condenser), and can also be a tube condenser.
The vacuum environment can make the quick flash distillation of the high temperature copper sulfate solution (saturated steam boiling point is far less than the feed temperature) that gets into the crystallizer, and the feed liquid forms the supersaturation fast and the temperature reduces fast to reduce 4 circulative cooling system's of heat exchanger cooling capacity, make the efficiency of system have very big promotion. Meanwhile, flash evaporation reduces water content and improves the crystallization mode of supersaturation degree, so that the crystallization yield of the copper sulfate is improved.
The discharge port 5-4 of the elutriation leg of the crystallizer is connected with the feed port of the side wall of the cyclone 7, the crystal-containing mother liquor outlet of the cyclone is connected with the feed port of the centrifuge 8, and the copper sulfate crystal slurry discharged by the centrifuge is output by a belt conveyor or a vibration belt and is sent to the next working procedure for drying or packaging.
An adjustable valve is arranged on a connecting pipeline between the discharge port of the washing leg and the cyclone for controlling the discharge flow, and a discharge pump 6 provided with a frequency converter can also be arranged.
An adjustable valve and a sight glass are arranged on a connecting pipeline of the cyclone and the centrifuge and are used for controlling the flow of the crystal-containing mother liquor entering the centrifuge.
An adjustable valve and a sight glass are arranged on a connecting pipeline of the cyclone and the mother liquor tank and are used for controlling the flow of the clear mother liquor entering the mother liquor tank.
The clear mother liquor outlet of the cyclone is connected with the feed inlet of the mother liquor tank 2, the clear mother liquor outlet of the centrifuge is connected with the feed inlet of the mother liquor tank 2, and the discharge outlet of the mother liquor tank is connected with the back washing feed inlet 5-5 of the washing leg of the crystallizer through the mother liquor reflux pump 1.
The centrifuge adopts a horizontal two-stage pusher centrifuge, and can also be other types of centrifuges.
The mother liquor tank is provided with agitating unit, prevents that tiny crystalline substance in the mother liquor from subsiding in the mother liquor tank, causes pipeline and jar interior jam. A liquid level measuring device is arranged in the mother liquor tank to keep a certain liquid level in the mother liquor tank.
The process of producing the copper sulfate crystal by the copper sulfate continuous crystallization system comprises the following steps:
(1) starting the vacuum pump to make the system reach a higher vacuum degree.
(2) After the fresh hot copper sulfate solution enters the crystallizer, the hot copper sulfate solution is quickly flashed in a vapor-liquid separation chamber of the crystallizer to form supersaturated mother liquor, so that crystallization driving force is provided for crystallization formation.
(3) And (3) feeding the secondary steam separated in the steam-liquid separation chamber into a condenser for condensation treatment, wherein the inlet water temperature of cooling water of the condenser is 30-35 ℃, the outlet water temperature of the condenser is 40-43 ℃, and the steam condensate and the outlet water of the cooling water are used for preheating the fresh copper sulfate solution.
(4) The supersaturated mother liquor separated by the vapor-liquid separation chamber flows into the crystal growing chamber through a downcomer.
(5) Cooling water is introduced into the heat exchanger as a cooling medium, and the axial flow pump is started to ensure that clear mother liquor in the crystallizer returns to the crystallizer after being cooled by the heat exchanger until the mother liquor in the crystal growing chamber reaches a supercooled state.
Under the double driving of supercooling degree and supersaturation degree, the copper sulfate mother liquor in the crystallizer can quickly form fine crystal materials, or crystals are attached to the fine crystal materials, so that crystal grains grow gradually, and larger crystal grains are gradually settled near the elutriation legs. This dual drive crystallization mode, very big promotion the crystallization efficiency of system.
The flow velocity of the copper sulfate mother liquor in the heat exchange tube is 1.8-2.5 m/s, and the mother liquor is prevented from scaling and crystallizing in the heat exchange tube due to cooling at the flow velocity. The supercooling degree of the mother liquid in the crystallizer is controlled by the heat exchanger, and the controllable growth of the crystal granularity and the consistency of the granularity is realized.
(6) Discharging the crystal material settled near the elutriation leg from a discharge port of the elutriation leg, controlling the content of crystal grains in mother liquor discharged from the discharge port of the elutriation leg to be 8-17 wt%, controlling the proportion of clear mother liquor discharged from the cyclone to the mother liquor entering the cyclone to be 50-80 vt%, and controlling the content of the crystal in the mother liquor entering the centrifuge to be 35-60 wt%. After the copper sulfate crystal is separated by a cyclone and a centrifuge, the copper sulfate crystal with the water content of about 5wt percent is obtained.
(7) Clear mother liquor discharged by the cyclone and the centrifuge is collected in a mother liquor tank, the washing legs are backwashed by the mother liquor, and part of the mother liquor in the crystallizer can also be used for backwashing the washing legs through the axial-flow pump. The mother liquor flow input into the back washing port by the mother liquor reflux pump and the axial flow pump is controlled, and the elutriation efficiency is adjusted, so that the crystal material to be discharged can be settled near the elutriation discharge port.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A copper sulfate continuous crystallization system is characterized in that: the copper sulfate continuous crystallization system comprises a crystallizer, a heat exchanger, an axial flow pump, a condenser, a swirler, a centrifuge, a mother liquor tank and a mother liquor reflux pump;
a circulating discharge port and a circulating feed port of the crystallizer are respectively connected with a heat exchanger, an axial flow pump is arranged on a pipeline, the heat exchanger is used for cooling the copper sulfate solution, and the axial flow pump is used for providing power for the circulation of the copper sulfate solution;
the steam outlet of the crystallizer is connected with a condenser;
a discharge port of an elutriation leg of the crystallizer is connected with a cyclone, a crystal-containing mother liquor outlet of the cyclone is connected with a centrifugal machine, and the cyclone and a clear mother liquor outlet of the centrifugal machine are respectively connected with a mother liquor tank;
the outlet of the mother liquor tank is connected with the back washing feed inlet of the elutriation leg of the crystallizer through a mother liquor reflux pump.
2. The continuous crystallization system of copper sulfate as claimed in claim 1, wherein: when the number of the heat exchangers is one, the circulating discharge hole of the crystallizer, the axial flow pump, the heat exchanger and the circulating feed hole of the crystallizer are sequentially connected, or the circulating discharge hole of the crystallizer, the heat exchanger, the axial flow pump and the circulating feed hole of the crystallizer are sequentially connected;
when the number of the heat exchangers is two, the circulating discharge hole of the crystallizer, the first heat exchanger, the axial-flow pump, the second heat exchanger and the circulating feed hole of the crystallizer are sequentially connected.
3. The continuous crystallization system of copper sulfate as claimed in claim 2, wherein: the outlet of the axial flow pump is connected with the back washing feed inlet of the elutriation leg of the crystallizer.
4. The continuous crystallization system of copper sulfate as claimed in claim 1, wherein: the discharge port of the washing leg is positioned on the side wall of the washing leg, the back washing feed port of the washing leg is positioned at the tail end of the washing leg, and the washing leg is positioned in the center of the bottom of the crystallizer.
5. The continuous crystallization system of copper sulfate as claimed in claim 1, wherein: the crystallizer is an Olso crystallizer, a DTB crystallizer or an FC crystallizer.
6. The continuous crystallization system of copper sulfate according to claim 1, wherein: the crystallizer comprises a vapor-liquid separation chamber positioned at the upper part and a crystal growing chamber positioned at the lower part, the vapor-liquid separation chamber is communicated with the crystal growing chamber through a downcomer, the circulating discharge port is positioned in the crystal growing chamber, and the copper sulfate solution inlet and the circulating feed port are positioned in the vapor-liquid separation chamber.
7. The continuous crystallization system of copper sulfate as claimed in claim 1, wherein: the copper sulfate continuous crystallization system is provided with a vacuum pump, and the vacuum pump is connected with a condenser and used for vacuumizing the crystallizer.
8. The continuous crystallization system of copper sulfate as claimed in claim 1, wherein: the discharge port of the elutriation leg of the crystallizer is connected with a cyclone through a discharge pump.
9. A method for producing copper sulfate crystals using the copper sulfate continuous crystallization system as claimed in any one of claims 1 to 8, comprising the steps of:
(1) delivering the hot copper sulfate solution to a crystallizer;
(2) circularly sending the copper sulfate solution in the crystallizer into a heat exchanger for cooling;
(3) feeding the steam in the crystallizer into a condenser for condensation treatment;
(4) sequentially feeding mother liquor containing sodium sulfate crystals in a crystallizer into a cyclone and a centrifugal machine, and separating to obtain copper sulfate crystals with the water content lower than 8%, wherein the content of the mother liquor crystals entering the cyclone is 8% -17%, the content of clear mother liquor discharged from the cyclone accounts for 50% -80% of the mother liquor entering the cyclone, and the content of the mother liquor crystals entering the centrifugal machine is 35% -60%;
(5) and back washing the washing legs by using clear mother liquor discharged by a cyclone and a centrifugal machine.
10. The method of claim 9, wherein: during the production process of the copper sulfate crystals, the crystallizer is in a vacuum-pumping state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210296079.1A CN114632344A (en) | 2022-03-24 | 2022-03-24 | Copper sulfate continuous crystallization system |
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| CN202210296079.1A CN114632344A (en) | 2022-03-24 | 2022-03-24 | Copper sulfate continuous crystallization system |
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| CN114632344A true CN114632344A (en) | 2022-06-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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