CN113104875A - Process for preparing superfine or nano calcium carbonate from carbide slag and treatment system thereof - Google Patents
Process for preparing superfine or nano calcium carbonate from carbide slag and treatment system thereof Download PDFInfo
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- CN113104875A CN113104875A CN202110346131.5A CN202110346131A CN113104875A CN 113104875 A CN113104875 A CN 113104875A CN 202110346131 A CN202110346131 A CN 202110346131A CN 113104875 A CN113104875 A CN 113104875A
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 86
- 239000002893 slag Substances 0.000 title claims abstract description 49
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 116
- 238000004062 sedimentation Methods 0.000 claims abstract description 75
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims description 21
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 16
- 238000011085 pressure filtration Methods 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 11
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 8
- 239000000920 calcium hydroxide Substances 0.000 description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 8
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 8
- 239000005997 Calcium carbide Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003541 multi-stage reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- 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
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- Nanotechnology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application relates to a process for preparing ultrafine or nano calcium carbonate from carbide slag and a treatment system thereof, wherein the treatment system comprises a washing tank, a high-pressure pump, a first cyclone sedimentation high-level tank, a first surface filter, CO2The device comprises a storage device, a pressure regulator, a microchannel reactor, a second cyclone sedimentation elevated tank, a second surface filter and a drying device; the washing tank is connected with the first cyclone sedimentation high-level tank through a high-pressure pump, a clear liquid port of the first cyclone sedimentation high-level tank is connected with the first surface filter, a clear liquid port and a pressure regulator of the first surface filter are both connected into a liquid inlet of the microchannel reactor, and CO is2The storage device is connected with the pressure regulator, the microchannel reactor is connected with the second cyclone sedimentation elevated tank, the clear liquid port of the second cyclone sedimentation elevated tank is connected with the second surface filter, and the second surface filterThe clear liquid port is connected with a drying device. The method realizes the reutilization of the waste residues, has the advantages of lower cost, short process time consumption and full reaction, and the particle size of the produced calcium carbonate can reach the nanometer level.
Description
Technical Field
The application belongs to the technical field of carbide slag treatment, and particularly relates to a process for preparing ultrafine or nano calcium carbonate from carbide slag and a treatment system thereof.
Background
Acetylene sludge, which is the waste residue obtained by hydrolyzing calcium carbide to obtain acetylene gas and taking calcium hydroxide as a main component. Acetylene is one of the important raw materials in the basic organic synthesis industry, the process for producing acetylene by using calcium carbide as a raw material and adding water (wet method) is simple and mature, and the acetylene accounts for a large proportion in China at present. More than 300 kg of acetylene gas can be generated by adding water into 1 ton of calcium carbide, and 10 tons of industrial waste liquid with the solid content of about 12 percent is generated at the same time, and is commonly called as calcium carbide slurry.
At present, the part of carbide slag is mainly sold to a water treatment plant in a cheap mode and is used for neutralizing wastewater to adjust the pH value, the carbide slag is rarely retreated and utilized, only a few laboratories can realize the preparation of calcium carbonate by the carbide slag, but the main problems of volume production are cost control, long process flow and high energy consumption, and the market price economy of the relative calcium carbonate is not high.
Disclosure of Invention
In order to solve the problems in the prior art, a first aspect of the present application provides a processing system for preparing ultrafine or nano calcium carbonate from carbide slag, comprising: a washing tank, a high-pressure pump, a first cyclone sedimentation high-level tank, a first surface filter and CO2The device comprises a storage device, a pressure regulator, a microchannel reactor, a second cyclone sedimentation elevated tank, a second surface filter and a drying device;
the washing tank is connected with a liquid inlet of the first cyclone sedimentation high-level tank through the high-pressure pump, a clear liquid port of the first cyclone sedimentation high-level tank is connected with a liquid inlet of the first surface filter, the clear liquid port of the first surface filter and an outlet of the pressure regulator are connected with a liquid inlet of the microchannel reactor, and the CO is introduced into the liquid inlet of the microchannel reactor2The storage device is connected with the air inlet of the pressure regulator, the liquid outlet of the microchannel reactor is connected with the liquid inlet of the second cyclone sedimentation elevated tank, the clear liquid port of the second cyclone sedimentation elevated tank is connected with the liquid inlet of the second surface filter, and the clear liquid port of the second surface filter is connected with the drying device.
As further described herein, the treatment system further comprises a first pressure filter and a second pressure filter;
the first surface filter and the slag discharge port of the first rotational flow sedimentation elevated tank are both connected with the feed port of the first pressure filter, and the liquid discharge port of the first pressure filter is connected with the liquid inlet of the first rotational flow sedimentation elevated tank;
the second surface filter and the slag discharge port of the second cyclone sedimentation elevated tank are both connected with the feed port of the second filter press, and the liquid discharge port of the second filter press is connected with the liquid inlet of the second cyclone sedimentation elevated tank.
As further illustrated in this application, the CO is2The storage means comprising CO2Storage tank and gasifier, said CO2The storage tank is connected with the carbon dioxide inlet of the pressure regulator through the gasifier.
As a further explanation of the present application, each of the first surface filter and the second surface filter includes a housing, a clear liquid port and a slag discharge port at a bottom end thereof, which are respectively disposed at one side of an upper end of the housing, a tube sheet and a plurality of filter elements disposed in the housing; the tube sheet is fixed shells inner wall, just the tube sheet will the casing internal part separates to be last cavity and lower cavity two parts, the clear liquid mouth is located go up cavity upper end one side, the filter core lower extreme extends to in the lower cavity, set up a plurality of through-holes on the tube sheet, the uncovered lower extreme in filter core upper end is sealed, the uncovered butt joint in filter core upper end through-hole position is fixed, makes inside the filter core with go up the indoor intercommunication of cavity, the inlet has still been seted up to lower cavity lower extreme one side.
As a further explanation of the application, clear liquid backflow port is further formed in the side end of the upper cavity, and the position of the clear liquid backflow port is lower than that of the clear liquid port.
As a further explanation of the present application, the microchannel reactor includes a first header pipe, a second header pipe, a third header pipe, and a plurality of Y-shaped branch pipes, the first header pipe, the second header pipe, and the third header pipe are arranged in parallel, and the Y-shaped branch pipes are uniformly distributed along the length direction of the first header pipe, the second header pipe, and the third header pipe, three ports of the Y-shaped branch pipes are respectively communicated with the first header pipe, the second header pipe, and the third header pipe, the interfaces of the first header pipe and the second header pipe are liquid inlets of the microchannel reactor, and the interface of the third header pipe is a liquid discharge port of the microchannel reactor.
The second aspect of the present application provides a process for preparing ultrafine calcium carbonate by using the above treatment system, comprising the following steps:
adding the hydrolyzed carbide slag into a washing tank, fully stirring and washing, and then sending into a first cyclone sedimentation elevated tank through a high-pressure pump;
introducing clear liquid settled by the first cyclone settling head tank into a first surface filter for filtering;
supernatant filtered by the first surface filter and CO regulated by the pressure regulator2Gas is respectively introduced into different liquid inlets of the microchannel reactor to carry out microchannel full reaction;
introducing the mixed solution subjected to the full reaction of the micro-channel into a second cyclone sedimentation elevated tank for secondary sedimentation treatment;
introducing the clear liquid settled by the second cyclone settling head tank into a second surface filter for filtering;
and (4) introducing the supernatant filtered by the second surface filter into a drying device for drying to obtain the superfine calcium carbonate.
As further illustrated by the present application, the process further comprises:
sending the slag slurry obtained by sedimentation in the first cyclone sedimentation elevated tank and the slag slurry obtained by filtration of the first surface filter into a first pressure filter for pressure filtration treatment, and returning the filtrate obtained by pressure filtration treatment of the first pressure filter to the first cyclone sedimentation elevated tank for secondary sedimentation treatment;
and (3) sending the slag slurry obtained by sedimentation in the second cyclone sedimentation elevated tank and the slag slurry obtained by filtration of the second surface filter into a second pressure filter for filter pressing treatment, and returning the filtrate obtained by filter pressing treatment of the second pressure filter to the second cyclone sedimentation elevated tank for secondary sedimentation treatment.
The third aspect of the application provides a process for preparing nano calcium carbonate by using the treatment system, wherein after the superfine calcium carbonate is obtained by using the treatment step, the obtained superfine calcium carbonate is introduced into the washing tank again, and then the treatment step is circulated to obtain the nano calcium carbonate.
Compared with the prior art, the method has the following beneficial technical effects:
the application provides a processing system can realize handling the carbide waste residue of system acetylene gas and produce superfine or nanometer level calcium carbonate to realize recycling of waste residue, and whole processing system reasonable in design, the cost is lower, the process flow is consuming time weak point, the reaction is abundant, the calcium carbonate particle size of production can reach nanometer level.
Adopt microchannel reactor to replace traditional multistage reaction equipment among this processing system, not only simplified process flow greatly, can also shorten reaction time greatly simultaneously, improve whole process flow's effect, more important time, the microchannel reaction principle that this application adopted can guarantee fully to contact between the reactant, this is because microchannel reactor is with CO2And calcium hydroxide clear solution after sedimentation and filtration treatment is divided into a large number of fine branches, and then mutual contact reaction is formed after the two branches are crossed and converged, namely CO2And the calcium hydroxide clear solution after sedimentation and filtration treatment is separated into a large number of fine branches to form multiple multistage contact reactions, so that the contact time of the two solutions is fully prolonged, and in addition, the arrangement of a large number of branch pipelines can also ensure that after some branch pipelines are blocked due to the existence of reaction residues, the rest normal branch pipelines can still be utilized to continue the microchannel reaction, and the service life of the whole microchannel reactor is prolonged.
Drawings
FIG. 1 is a schematic view of a treatment system for preparing calcium carbonate from carbide slag provided herein;
FIG. 2 is a schematic diagram of a front view of a microchannel reactor provided herein;
FIG. 3 is a schematic diagram of a top view of a microchannel reactor provided herein;
fig. 4 is a schematic structural diagram of a surface processor provided in the present application.
Description of the reference numerals
1-a washing tank; 2-a high pressure pump; 3-a first cyclone sedimentation elevated tank; 4-microchannel reactor; 401-a first manifold; 402-a first leg; 403-a second manifold; 404-a second manifold; 405-a third leg; 406-a third manifold; 5-first pressure filter, 6-CO2 storage device, 7-first surface filter, 701-clear liquid return port; 702-an upper chamber; 703-a filter element; 704-a liquid inlet; 705-slag discharge port; 706-a lower chamber; 707-a tube sheet; 708-clear liquid port; 709-a shell; 8-a pressure regulator, 9-a second cyclone settling elevated tank, 10-a second surface filter, 11-a second pressure filter and 12-a drying device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The technical solution of the present application will be explained with reference to specific embodiments.
Example 1
As shown in fig. 1, a processing system for preparing ultrafine or nano calcium carbonate from carbide slag is provided, which comprises: a washing tank 1, a high pressure pump 2, a first cyclone sedimentation elevated tank 3, a first surface filter 7, CO2The device comprises a storage device 6, a pressure regulator 8, a microchannel reactor 4, a second cyclone settling elevated tank 9, a second surface filter 10 and a drying device 12;
the washing tank 1 is connected with a liquid inlet of the first cyclone sedimentation high-level tank 3 through the high-pressure pump 2, a clear liquid port of the first cyclone sedimentation high-level tank 3 is connected with a liquid inlet of the first surface filter 7, the clear liquid port of the first surface filter 7 and an outlet of the pressure regulator 8 are connected with a liquid inlet of the microchannel reactor 4, and the CO is discharged from the liquid inlet of the microchannel reactor2The storage device 6 is connected with the air inlet of the pressure regulator 8, the liquid outlet of the microchannel reactor 4 is connected with the liquid inlet of the second cyclone settling elevated tank 9, the clear liquid outlet of the second cyclone settling elevated tank 9 is connected with the liquid inlet of the second surface filter 10,the clear liquid port of the second surface filter 10 is connected with the drying device 12.
The application provides a processing system can realize handling the carbide waste residue of system acetylene gas and produce superfine or nanometer level calcium carbonate to realize recycling of waste residue, and whole processing system reasonable in design, the cost is lower, the process flow is consuming time weak point, the reaction is abundant, the calcium carbonate particle size of production can reach nanometer level.
The reaction treatment principle is as follows: the waste residue after calcium carbide hydrolysis contains main component calcium hydroxide and a small part of other impurities, most of fixed impurities after hydrolysis are removed from the waste residue after washing, settling and filtering treatment, and clear liquid containing calcium hydroxide and CO2The gas fully reacts to obtain a solution containing calcium carbonate, the mixed solution is settled and filtered again to obtain clear liquid, and the clear liquid is dried to obtain the superfine calcium carbonate, and the calcium carbonate is circulated once again, namely the superfine calcium carbonate is washed, settled, filtered again and mixed with CO2And (4) drying the secondary treated clear liquid obtained after reaction, sedimentation and filtration to obtain the nano-grade calcium carbonate.
Adopt microchannel reactor to replace traditional multistage reaction equipment among this processing system, not only simplified process flow greatly, can also shorten reaction time greatly simultaneously, improve whole process flow's effect, more important time, the microchannel reaction principle that this application adopted can guarantee fully to contact between the reactant, this is because microchannel reactor is with CO2And calcium hydroxide clear solution after sedimentation and filtration treatment is divided into a large number of fine branches, and then mutual contact reaction is formed after the two branches are crossed and converged, namely CO2And the calcium hydroxide clear solution after sedimentation and filtration treatment is separated into a large number of fine branches to form multiple multistage contact reactions, so that the contact time of the two solutions is fully prolonged, and in addition, the arrangement of a large number of branch pipelines can also ensure that after some branch pipelines are blocked due to the existence of reaction residues, the rest normal branch pipelines can still be utilized to continue the microchannel reaction, and the service life of the whole microchannel reactor is prolonged.
Specifically, as shown in fig. 2 and 3, the microchannel reactor includes a first header, a second header, a third header, and a plurality of Y-shaped branches (the Y-shaped branch is composed of three parts, i.e., a first branch 402, a second branch 404, and a third branch 405), the first header, the second header, and the third header are arranged in parallel, and the Y-shaped branch pipes are uniformly distributed along the length directions of the first header pipe, the second header pipe and the third header pipe, the three ports of the Y-branch are respectively communicated with the first, second and third manifolds, that is, the first branch 402 is communicated with the first manifold 401, the second branch 404 is communicated with the second manifold 403, the third branch 405 is communicated with the first manifold 406, the interface of the first header pipe and the second header pipe is a liquid inlet of the microchannel reactor 4, and the interface of the third header pipe is a liquid outlet of the microchannel reactor 4.
When the microchannel reactor is used, CO is introduced2And the calcium hydroxide clear liquid after sedimentation and filtration treatment is respectively introduced into the first main pipe 401 and the second main pipe 403, the third main pipe 406 is externally connected with a subsequent reaction treatment container, at the moment, each reaction liquid in the first main pipe 401 and the second main pipe 403 is divided into countless small branches and then introduced into different first branch pipes 402 and second branch pipes 404, and the reaction liquid in the communicated first branch pipes 402 and second branch pipes 404 is subjected to contact reaction and then is merged into the third branch pipes 405, and finally is completely merged into the first main pipe 406 for export.
As shown in fig. 4, each of the first surface filter 7 and the second surface filter 10 in the present application includes a housing 709, a clear liquid port 708 and a slag discharge port 705 respectively disposed at one side of an upper end of the housing 709 and at a bottom end of the housing 709, a tube plate 707 disposed in the housing 709, and a plurality of filter elements 703; the tube plate 707 is fixed to the inner wall of the shell 709, the tube plate 707 divides the interior of the shell 709 into an upper chamber 702 and a lower chamber 706, the clear liquid port 708 is located on one side of the upper end of the upper chamber 702, the lower end of the filter element 703 extends into the lower chamber 706, the tube plate 707 is provided with a plurality of through holes, the lower end of the upper end opening of the filter element 703 is sealed, the upper end opening of the filter element 703 is butted and fixed to the through holes, so that the interior of the filter element 703 is communicated with the interior of the upper chamber 702, and one side of the lower end of the lower chamber 706 is further provided with a liquid inlet 704; the filter element 703 can be formed by combining an outer-coated filter membrane and an inner keel, namely, the filter membrane is coated on the outer side of the inner support keel to form the filter element 703;
further, a clear liquid return port 701 is further formed at a side end of the upper chamber 702, and the clear liquid return port 701 is lower than the clear liquid port 708; and valve bodies are arranged on the clear liquid return port 701, the slag discharge port 705 and the liquid inlet 704.
When the surface filter is used, firstly, the slag discharge port 704 is closed, after the liquid after reaction is introduced into the liquid inlet 704 through the pressure pump, the liquid flows into the lower chamber 706 and contacts with the filter element 703, the clear liquid enters the filter element 70 after being filtered by the filter element 70 surface filter membrane, the residue is intercepted on the outer surface of the filter membrane, the inner page of the lower chamber 706 gradually rises along with the increasing of the inflowing liquid until the liquid level reaches the top end of the lower chamber 706, at the moment, the turbid liquid in the lower chamber is blocked by the tube plate 707, only the clear liquid filtered by the filter element 70 can flow into the upper chamber 702 through the opening at the upper end of the lower chamber, and the clear liquid can be discharged along with the liquid level rising to the clear liquid port 708 position again; in addition, because the liquid initially flowing into the upper chamber 702 may not meet the filtering standard, the clear liquid backflow port 701 is provided, the initial clear liquid can be discharged and then returned to the original liquid to be filtered, and then the initial clear liquid and the original liquid are introduced into the liquid inlet 704 again together, until the clear liquid meets the filtering standard, the clear liquid backflow port 701 can be closed, and the clear liquid can be discharged when reaching the clear liquid port 708.
Above-mentioned surface filter compares in ordinary plate and frame pressure filter, and it filters many times by supreme slow down through a plurality of filter cores, can obviously carry into filterable effect, and filter fineness is very high, and whole volume is less, and equipment use cost is low, and its holistic sealed effect is also fine, can effectively block spilling over of harmful gas.
In an implementable manner, the treatment system further comprises a first pressure filter 5 and a second pressure filter 11;
the first surface filter 7 and the slag discharge port of the first rotational flow sedimentation elevated tank 3 are both connected with the feed port of the first pressure filter 5, and the liquid discharge port of the first pressure filter 5 is connected with the liquid inlet of the first rotational flow sedimentation elevated tank 3;
the second surface filter 10 and the slag discharge port of the second cyclone sedimentation elevated tank 9 are both connected with the feed port of the second pressure filter 11, and the liquid discharge port of the second pressure filter 11 is connected with the liquid inlet of the second cyclone sedimentation elevated tank 9.
The CO is2The storage means 6 comprises CO2Storage tank and gasifier, said CO2The storage tank is connected with the carbon dioxide inlet of the pressure regulator 8 through the gasifier.
The first filter press 5 and the second filter press 11 can adopt a plate and frame filter press, and the arrangement of the filter presses can filter and press the slag slurry generated by the surface filter and the cyclone sedimentation elevated tank again, so that the clear liquid in the slag slurry returns to the cyclone sedimentation elevated tank again for secondary utilization, and the slag slurry after filter pressing is more fully processed.
Example 2
The process for preparing ultrafine calcium carbonate using the treatment system of example 1 comprises the following steps:
adding the hydrolyzed carbide slag into a washing tank 1 for fully stirring and washing, and then sending the carbide slag into a first cyclone sedimentation elevated tank 3 through a high-pressure pump 2;
introducing clear liquid settled by the first cyclone settling head tank 3 into a first surface filter 7 for filtering;
supernatant filtered by the first surface filter 7 and CO regulated by the pressure regulator 82Gas is respectively introduced into different liquid inlets of the microchannel reactor 4 to carry out microchannel full reaction;
introducing the mixed solution subjected to the full reaction of the micro-channel into a second cyclone sedimentation elevated tank 9 for secondary sedimentation treatment;
the clear liquid settled by the second cyclone settling head tank 9 is introduced into a second surface filter 10 for filtering;
and (3) introducing the supernatant filtered by the second surface filter 10 into a drying device for drying to obtain the superfine calcium carbonate.
Wherein, the slag slurry obtained by sedimentation in the first cyclone sedimentation elevated tank 3 and the slag slurry obtained by filtration of the first surface filter 7 are both sent to the first pressure filter 5 for pressure filtration treatment, and the filtrate obtained by pressure filtration treatment of the first pressure filter 5 is returned to the first cyclone sedimentation elevated tank 3 for secondary sedimentation treatment;
and the slag slurry obtained by sedimentation in the second cyclone sedimentation elevated tank 9 and the slag slurry obtained by filtration by the second surface filter 10 are both sent to a second pressure filter 11 for pressure filtration treatment, and the filtrate obtained by pressure filtration treatment of the second pressure filter 11 is returned to the second cyclone sedimentation elevated tank 9 for secondary sedimentation treatment.
Example 3
The process for preparing nano calcium carbonate by using the treatment system in the embodiment 1 comprises the following steps:
and (3) introducing the superfine calcium carbonate obtained by the treatment step of the embodiment 2 into the washing tank 1, and then recycling the treatment step of the embodiment 2 to obtain the nano calcium carbonate.
The embodiments given above are preferable examples for implementing the present application, and the present application is not limited to the above-described embodiments. Any non-essential addition or replacement made by a person skilled in the art according to the technical features of the technical solution of the present application falls within the scope of the present application.
Claims (9)
1. A processing system for preparing superfine or nano calcium carbonate from carbide slag is characterized by comprising the following components: a washing tank, a high-pressure pump, a first cyclone sedimentation high-level tank, a first surface filter and CO2The device comprises a storage device, a pressure regulator, a microchannel reactor, a second cyclone sedimentation elevated tank, a second surface filter and a drying device;
the washing tank is connected with a liquid inlet of the first cyclone sedimentation high-level tank through the high-pressure pump, a clear liquid port of the first cyclone sedimentation high-level tank is connected with a liquid inlet of the first surface filter, the clear liquid port of the first surface filter and an outlet of the pressure regulator are connected with a liquid inlet of the microchannel reactor, and the CO is introduced into the liquid inlet of the microchannel reactor2The storage device is connected with the air inlet of the pressure regulator, and the liquid outlet of the microchannel reactor is connected with the liquid outlet of the pressure regulatorThe liquid inlet of the second cyclone sedimentation elevated tank is connected with the liquid inlet of the second surface filter, and the clear liquid port of the second cyclone sedimentation elevated tank is connected with the drying device.
2. The treatment system for preparing calcium carbonate from carbide slag according to claim 1, further comprising a first pressure filter and a second pressure filter;
the first surface filter and the slag discharge port of the first rotational flow sedimentation elevated tank are both connected with the feed port of the first pressure filter, and the liquid discharge port of the first pressure filter is connected with the liquid inlet of the first rotational flow sedimentation elevated tank;
the second surface filter and the slag discharge port of the second cyclone sedimentation elevated tank are both connected with the feed port of the second filter press, and the liquid discharge port of the second filter press is connected with the liquid inlet of the second cyclone sedimentation elevated tank.
3. The treatment system for preparing calcium carbonate from carbide slag according to claim 1, wherein the CO is2The storage means comprising CO2Storage tank and gasifier, said CO2The storage tank is connected with the carbon dioxide inlet of the pressure regulator through the gasifier.
4. The treatment system for preparing calcium carbonate from carbide slag according to claim 1, wherein each of the first surface filter and the second surface filter comprises a shell, a clear liquid port and a slag discharge port, a tube plate and a plurality of filter elements, wherein the clear liquid port and the slag discharge port are respectively arranged at one side of the upper end of the shell, and the tube plate and the plurality of filter elements are arranged in the shell; the tube sheet is fixed shells inner wall, just the tube sheet will the casing internal part separates to be last cavity and lower cavity two parts, the clear liquid mouth is located go up cavity upper end one side, the filter core lower extreme extends to in the lower cavity, set up a plurality of through-holes on the tube sheet, the uncovered lower extreme in filter core upper end is sealed, the uncovered butt joint in filter core upper end through-hole position is fixed, makes inside the filter core with go up the indoor intercommunication of cavity, the inlet has still been seted up to lower cavity lower extreme one side.
5. The treatment system for preparing calcium carbonate from carbide slag according to claim 4, wherein a clear liquid return port is further formed at a side end of the upper chamber, and the clear liquid return port is lower than the clear liquid port.
6. The treatment system for preparing calcium carbonate from carbide slag according to claim 1, wherein the microchannel reactor comprises a first main pipe, a second main pipe, a third main pipe and a plurality of Y-shaped branch pipes, the first main pipe, the second main pipe and the third main pipe are arranged in parallel, the Y-shaped branch pipes are uniformly distributed along the length direction of the first main pipe, the second main pipe and the third main pipe, three ports of the Y-shaped branch pipes are respectively communicated with the first main pipe, the second main pipe and the third main pipe, the interfaces of the first main pipe and the second main pipe are liquid inlets of the microchannel reactor, and the interface of the third main pipe is a liquid outlet of the microchannel reactor.
7. A process for preparing ultrafine calcium carbonate using the treatment system of claim 1, comprising the steps of:
adding the hydrolyzed carbide slag into a washing tank, fully stirring and washing, and then sending into a first cyclone sedimentation elevated tank through a high-pressure pump;
introducing clear liquid settled by the first cyclone settling head tank into a first surface filter for filtering;
supernatant filtered by the first surface filter and CO regulated by the pressure regulator2Gas is respectively introduced into different liquid inlets of the microchannel reactor to carry out microchannel full reaction;
introducing the mixed solution subjected to the full reaction of the micro-channel into a second cyclone sedimentation elevated tank for secondary sedimentation treatment;
introducing the clear liquid settled by the second cyclone settling head tank into a second surface filter for filtering;
and (4) introducing the supernatant filtered by the second surface filter into a drying device for drying to obtain the superfine calcium carbonate.
8. The process for preparing ultrafine calcium carbonate according to claim 7, further comprising:
sending the slag slurry obtained by sedimentation in the first cyclone sedimentation elevated tank and the slag slurry obtained by filtration of the first surface filter into a first pressure filter for pressure filtration treatment, and returning the filtrate obtained by pressure filtration treatment of the first pressure filter to the first cyclone sedimentation elevated tank for secondary sedimentation treatment;
and (3) sending the slag slurry obtained by sedimentation in the second cyclone sedimentation elevated tank and the slag slurry obtained by filtration of the second surface filter into a second pressure filter for filter pressing treatment, and returning the filtrate obtained by filter pressing treatment of the second pressure filter to the second cyclone sedimentation elevated tank for secondary sedimentation treatment.
9. A process for preparing nano calcium carbonate by using the treatment system of claim 1, which is characterized in that after the superfine calcium carbonate is obtained by using the treatment step of claim 7, the obtained superfine calcium carbonate is introduced into a washing tank again, and then the treatment step of claim 7 is circulated to obtain the nano calcium carbonate.
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