CN113044871A - Process for producing calcium chloride by using iron oxide black filtrate and fluidized bed drying device for production - Google Patents
Process for producing calcium chloride by using iron oxide black filtrate and fluidized bed drying device for production Download PDFInfo
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- CN113044871A CN113044871A CN202110337119.8A CN202110337119A CN113044871A CN 113044871 A CN113044871 A CN 113044871A CN 202110337119 A CN202110337119 A CN 202110337119A CN 113044871 A CN113044871 A CN 113044871A
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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
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/28—Chlorides by chlorination of alkaline-earth metal compounds
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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
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/30—Concentrating; Dehydrating; Preventing the adsorption of moisture or caking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
- F26B3/084—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange
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- General Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a process for producing calcium chloride by using iron black filtrate and a fluidized bed drying device for production thereof. The invention can solve the problem that iron oxide black filtrate is difficult to treat, and can also produce calcium chloride products; the material is fully contacted with flowing air by matching the special structure of the boiling bed plate with the brush roller to brush the material; unnecessary moisture on the material is detached fast through sponge adsorption mechanism, and rethread upset drying mechanism overturns the drying to the material, breaks up and cold air drying the material through centrifugal drying mechanism at last, avoids the material caking, makes the abundant cool drying of material.
Description
Technical Field
The invention relates to the technical field of wastewater recycling, in particular to a process for producing calcium chloride by using iron oxide black filtrate and a fluidized bed drying device for producing the calcium chloride.
Background
The iron oxide black filtrate is the filtrate obtained by filter pressing of iron oxide black, the iron oxide black filtrate produced by the applicant company has a large amount of 150-200 square/d, the iron content in the filtrate is 50g/L, the zinc content in the filtrate is 10g/L, and the chloride ion content in the filtrate is about 100000 mg/L. Other enterprises treat iron oxide black filtrate by directly discharging sewage, and when the filtrate enters a sewage plant for treatment, a large amount of iron-containing sludge can be generated, the content of chloride ions is high, the harmful effects on bacteria are caused, and the defects of difficult treatment, high cost and more required labor and medicaments exist.
In addition, the applicant uses the fluidized bed drying device to finally dry the calcium chloride product in the process of producing the calcium chloride, and finds that the existing fluidized bed drying device has the following disadvantages in the using process:
1. calcium chloride containing certain moisture is easy to agglomerate in the process of entering drying equipment, so that the particle size of calcium chloride particles exceeds the standard;
2. during continuous production, if the feeding amount of calcium chloride is large, the calcium chloride cannot be fully contacted with airflow, so that the moisture on the surfaces of calcium chloride particles is difficult to be completely taken away, and the product quality is reduced; if the calcium chloride is fed less, the product quality can be ensured, but the production efficiency can be greatly reduced, and the production cost of enterprises can be increased.
Disclosure of Invention
The invention aims to solve the problems and designs a process for producing calcium chloride by using iron black filtrate and a fluidized bed drying device for producing the calcium chloride.
The technical scheme of the invention is that the process for producing calcium chloride by using iron black filtrate comprises the following steps:
pumping a square iron black filtrate from an iron black filtrate regulating tank to a primary treatment reaction tank;
adding lime milk with the concentration of 32% in the b direction into the primary treatment reaction tank, and fully stirring and reacting to ensure that the PH of the liquid in the primary treatment reaction tank is 8.5-9, wherein a: b = 10: 2.7 to 3.3.
C kilograms of activated carbon is added into the primary treatment reaction tank, and the stirring reaction is carried out fully, wherein a: c =1: 4;
filtering the liquid in the primary treatment reaction tank by using a plate-and-frame filter press, filtering out calcium chloride and iron-containing sludge, and discharging the filtered liquid to a secondary treatment reaction tank;
d kg of hydrogen peroxide is added into the secondary treatment reaction tank, e kg of active carbon is added again after the mixture is fully stirred, the mixture is fully stirred and reacted, wherein a: d: e = 2: 10: 5;
filtering the liquid in the secondary treatment reaction tank by using a plate-and-frame filter press, and evaporating the filtered liquid in a triple-effect evaporator after entering an evaporation tank to be evaporated;
after the evaporation of the triple-effect evaporator, the material is subjected to primary drying by a spray drying device and then secondary drying by a fluidized bed drying device to prepare a calcium chloride product.
The invention also provides a fluidized bed drying device for producing calcium chloride by using the iron black filtrate, which comprises a shell, a hot air blowing mechanism, a cold air blowing mechanism, an air outlet arranged at the top of the shell and a fluidized bed plate arranged in the shell and provided with a vent hole, wherein the size of the vent hole is smaller than that of a particle material, a feed inlet is arranged on one side of the upper end of the shell, and a discharge outlet is arranged on one side of the lower end of the shell;
the boiling bed plate comprises a plurality of arc-shaped upward sections which are gradually reduced from a feed inlet to a discharge outlet, the upper and lower parts of each arc-shaped upward section are respectively a discharge end and a feed end, the discharge end of each arc-shaped upward section is fixedly provided with an inclined sliding section, the inclined sliding section at the most downstream is connected with the discharge outlet, and the inclined lower ends of the other inclined sliding sections are connected with the feed ends of the adjacent arc-shaped upward sections at the downstream;
the device is characterized in that brush rollers for conveying materials at the feeding end of the arc-shaped upward sections to the discharging end of the arc-shaped upward sections are arranged in the shell and at the positions of the arc-shaped upward sections, sponge adsorption mechanisms for adsorbing material moisture are arranged at the positions of the uppermost stream inclined sliding sections in the shell and at the positions of the lowermost stream inclined sliding sections, overturning and drying mechanisms for overturning and drying the materials are arranged at the positions of the uppermost stream inclined sliding sections and the lowermost stream inclined sliding sections in the shell, centrifugal drying mechanisms for centrifugally scattering the materials are arranged at the positions of the lowermost stream inclined sliding sections, and arc-shaped guide plates are arranged in the shell and right above the inclined sliding sections;
a lower partition plate extending downwards to the bottom end of the shell is fixed at the feeding end of the downstream arc-shaped raising section in the shell, the lower partition plate divides the area below the boiling bed plate into a hot air inlet area and a cold air inlet area, the hot air blowing mechanism supplies hot air to the hot air inlet area, and the cold air blowing mechanism supplies cold air to the cold air inlet area;
an upper baffle plate is fixed on the arc-shaped material guide plate right above the lower baffle plate, and the upper baffle plate divides the area in the shell and above the boiling bed plate into a hot air drying area and a cold air drying area.
Preferably, the sponge adsorption mechanism comprises a first rotating shaft horizontally and rotatably installed in the shell, the rotating direction of the first rotating shaft is opposite to that of the brush roller, a plurality of rotating plates are installed on the first rotating shaft, the rotating plates are circumferentially distributed along the axis of the first rotating shaft, a water-absorbing sponge is embedded on one end face of each rotating plate, a first installation seat is fixed on the other end face of each rotating plate, a second rotating shaft is installed between the first installation seats, a pressing plate used for extruding the water-absorbing sponge on the adjacent rotating plate to remove water is fixedly installed on the second rotating shaft, one end of each pressing plate extends out of the corresponding rotating plate, a first torsion spring is sleeved on the second rotating shaft, one end of each first torsion spring is connected with the first installation seat, the other end of each first torsion spring is connected with the second rotating shaft, the first torsion spring provides elastic force for separating the pressing plate from the water-absorbing sponge, a third installation seat is fixed on the upstream inclined sliding, a limiting plate matched with the pressing plate is fixedly arranged on the third rotating shaft, a second torsion spring is sleeved on the third rotating shaft, one end of the second torsion spring is connected with the third mounting seat, the other end of the second torsion spring is connected with the third rotating shaft, the second torsion spring is used for providing resistance for limiting the pressing plate to pass through so that the pressing plate is contacted with the water absorption sponge, and the elasticity of the second torsion spring is greater than that of the first torsion spring; and a U-shaped limiting frame is fixed on the upstream inclined sliding section and is positioned at the downstream of the limiting plate, the U-shaped limiting frame is connected with the third mounting seat and is enclosed into a water accumulation area, a water accumulation groove communicated with the water accumulation area is fixed on the lower end surface of the upstream inclined sliding section, a drain pipe is installed at the bottom of the water accumulation groove, and the other end of the drain pipe extends out of the shell.
Preferably, upset drying mechanism includes that the level rotates the hollow pivot of installing in the casing, hollow pivot and brush roller rotation opposite direction, install a plurality of hollow returning face plates that are "7" style of calligraphy in the hollow pivot, hollow returning face plate both sides terminal surface and towards the terminal surface of hollow pivot all are equipped with the ventilation mouth, ventilation mouth size is less than the granule material size, hollow returning face plate is the circumference along hollow pivot axis and distributes, install a plurality ofly and the rotatory air outlet pipe that is "7" style of calligraphy of hollow pivot intercommunication in the hollow returning face plate along hollow pivot axis direction, the terminal surface department that the ventilation mouth was seted up towards hollow returning face plate to rotatory air outlet pipe is equipped with the air exit, hollow pivot one end extends to the casing outside and installs rotary joint, the rotary joint other end is connected with hot-blast air supply mechanism, hot-blast air supply mechanism passes through rotary joint and carries hot-air to.
Preferably, centrifugal drying mechanism includes that vertical rotation installs a plurality of centrifugal pivots on the most low reaches slope landing section, centrifugal pivot arranges along casing width direction, centrifugal carousel is installed to centrifugal pivot upper end, each centrifugal carousel next-door neighbour arranges and is higher than the discharge gate, be less than its adjacent arc upper run section discharge end, centrifugal pivot lower extreme extends to slope landing section below and installs first driven pulley, install centrifugal drive motor in the casing, first drive pulley is installed to centrifugal drive motor output, first drive pulley is connected with each first driven pulley transmission through first driving belt.
Preferably, the hot air blowing mechanism comprises an air heater, a tee joint is installed at the output end of the air heater, a bottom hot air pipe and an upper hot air pipe are installed at two output ends of the tee joint respectively, the other end of the bottom hot air pipe extends to a hot air inlet area and is fixed on the lower partition plate, the bottom hot air pipe is obliquely arranged below the boiling bed plate and supplies air to the boiling bed plate, branch pipes in one-to-one correspondence with the hollow rotating shafts are connected to the upper hot air pipe, and the output ends of the branch pipes are connected with the rotary joint.
Preferably, cold wind blows mechanism includes the air-blower, and the cold-blast pipe is installed to the air-blower output, and the cold-blast pipe other end extends to in the cold wind air inlet zone and fixes on baffle down, preferably, just be located the filter screen that the feed inlet top was equipped with the level and sets up in the casing.
Preferably, the boiling bed board is arranged obliquely upwards from two sides of the connecting end of the shell to form a U-shaped groove structure for accumulating materials in the middle of the boiling bed board.
Preferably, still including the rotary driving mechanism who is used for driving sponge adsorption device and the operation of upset drying mechanism, rotary driving mechanism is including installing the motor support on the casing, install the rotary driving motor on the motor support, the second driving pulley is installed to the rotary driving motor output, the second driven pulley is all installed to each brush roller one end, the third driven pulley is all installed to first pivot and each hollow pivot one end, the second driving pulley passes through second driving belt and each second driven pulley and each third driven pulley transmission are connected, the diameter of third driven pulley is greater than the diameter of second driven pulley.
The invention has the beneficial effects that:
1. according to the invention, chloride ions in the iron oxide black filtrate can be fully utilized and combined with calcium ions in the lime milk to produce calcium chloride products, so that the problem that the iron oxide black filtrate is difficult to treat can be solved, and the calcium chloride products can also be produced; the treatment capacity of the filtrate is 40-50 square/day, the daily produced calcium chloride finished product is 6-8t, the appearance of the calcium chloride finished product is pure white, and the content is more than 90 percent, so that the requirement of anhydrous calcium chloride is met;
2. the boiling bed plate is arranged into a structure formed by sequentially connecting an arc-shaped lifting section and an inclined sliding section, and the material is brushed by matching with the brush roller, so that the material is dispersed and fully contacted with flowing air, and the drying efficiency is improved;
3. the sponge adsorption mechanism is used for absorbing water for the materials which just enter the shell, and the excessive water on the materials is quickly removed; the materials are overturned through the overturning drying mechanism, and air is supplied for drying in the overturning process, so that the materials can be uniformly dried even if the feeding amount of the materials is large; and finally, scattering the materials and drying the materials by cold air through a centrifugal drying mechanism, so that the materials are prevented from caking, and the materials are fully cooled and dried.
Drawings
FIG. 1 is a schematic diagram of the structure of an ebullated bed drying apparatus;
FIG. 2 is a front view of an ebullated bed drying apparatus;
FIG. 3 is a cross-sectional view of the steps taken along line A-A of FIG. 1;
FIG. 4 is a partial side view of the most upstream arcuate raising section and brush roll;
FIG. 5 is an enlarged view of a portion of FIG. 1 at B;
FIG. 6 is an enlarged view of a portion of FIG. 1 at D;
FIG. 7 is a top cross-sectional view of the tumble drying mechanism;
FIG. 8 is a top view of the sponge adsorbing mechanism;
FIG. 9 is an enlarged view of a portion of FIG. 8 at C;
FIG. 10 is an enlarged view of a portion of FIG. 1 at E;
FIG. 11 is a bottom view of the centrifugal drying mechanism;
FIG. 12 is a schematic view of the connection structure of the hollow shaft and the rotary air outlet pipe;
FIG. 13 is a flow diagram of a process for producing calcium chloride from iron black filtrate;
in the figure, 1, an iron black filtrate adjusting tank; 2. a primary treatment reaction tank; 3. a secondary treatment reaction tank; 4. a plate-and-frame filter press; 5. a pool to be evaporated; 6. a triple effect evaporator; 7. a spray drying device; 8. a fluidized bed drying device; 801. a housing; 802. an air outlet; 803. a vent hole; 804. boiling bed plate; 805. a feed inlet; 806. a discharge port; 807. an arc-shaped raising section; 808. an inclined sliding section; 809. a brush roller; 810. an arc-shaped material guide plate; 811. a lower partition plate; 812. a hot air inlet area; 813. a cold air inlet area; 814. an upper partition plate; 815. a hot air drying zone; 816. a cold air drying zone; 817. a first rotating shaft; 818. a rotating plate; 819. a water-absorbing sponge; 820. a first mounting seat; 821. a second rotating shaft; 822. pressing a plate; 823. a first torsion spring; 824. a third mounting seat; 825. a third rotating shaft; 826. a limiting plate; 827. a second torsion spring; 828. a U-shaped limit frame; 829. a water accumulation area; 830. a water accumulation tank; 831. a drain pipe; 832. a hollow rotating shaft; 833. a hollow roll-over plate; 834. a ventilation opening; 835. rotating the air outlet pipe; 836. a rotary joint; 837. a centrifugal rotating shaft; 838. a centrifugal turntable; 839. a first driven pulley; 840. a centrifugal drive motor; 841. a first drive pulley; 842. a first drive belt; 843. a hot air blower; 844. a tee joint; 845. a bottom hot air pipe; 846. an upper hot air duct; 847. a branch pipe; 848. a blower; 849. a cold air pipe; 850. filtering with a screen; 851. a motor bracket; 852. a rotary drive motor; 853. a second drive pulley; 854. a second driven pulley; 855. a third driven pulley; 856. a second drive belt.
Detailed Description
Example 1
The invention is described in detail below with reference to the accompanying drawings, as shown in FIG. 13: a process for producing calcium chloride by using iron black filtrate comprises the following steps:
1. pumping a square iron black filtrate from an iron black filtrate regulating tank 1 to a primary treatment reaction tank 2;
2. adding lime milk with the b-side concentration of 32% into the primary treatment reaction tank 2, and fully stirring and reacting to ensure that the pH of the liquid in the primary treatment reaction tank 2 is 8.6, wherein a =20, b =6, a: b = 5: 3.
3. c kg of activated carbon was added to the primary treatment reaction tank 2, and the reaction was stirred sufficiently, where c =40, a: c =1: 4;
4. filtering the liquid in the primary treatment reaction tank 2 through a plate-and-frame filter press 4, filtering out calcium chloride and iron-containing sludge, and discharging the filtered liquid to a secondary treatment reaction tank 3;
5. d kg of hydrogen peroxide is added into the secondary treatment reaction tank 3, e kg of activated carbon is added again after the mixture is fully stirred, the mixture is fully stirred and reacted, wherein d =50, e =25, a: d: e = 2: 10: 5;
6. filtering the liquid in the secondary treatment reaction tank 3 through a plate-and-frame filter press 4, and allowing the filtered liquid to enter a to-be-evaporated tank 5 and then enter a triple-effect evaporator 6 for evaporation;
7. after the evaporation of the triple-effect evaporator 6, the material is subjected to primary drying by a spray drying device 7 and secondary drying by a fluidized bed drying device 8 to prepare a calcium chloride product.
The calcium chloride produced by the embodiment has white appearance, and the content of the calcium chloride is more than 90 percent, thereby meeting the requirement of anhydrous calcium chloride.
The invention also provides a fluidized bed drying device for producing calcium chloride by using iron black filtrate, as shown in fig. 1-12, the fluidized bed drying device comprises a shell 801, a hot air blowing mechanism, a cold air blowing mechanism, an air outlet 802 arranged at the top of the shell 801 and a fluidized bed board 804 arranged in the shell 801 and provided with an air vent 803, the air outlet 802 is connected with a dust removing device capable of generating negative pressure through a pipeline, such as a bag-type dust remover, and the like, the size of the air vent 803 is smaller than that of a particle material, a feeding hole 805 is arranged on one side of the upper end of the shell 801, and a discharging hole 806 is arranged on one side of the;
the boiling bed board 804 comprises a plurality of arc-shaped raising sections 807 which are gradually reduced from the feed inlet 805 to the discharge outlet 806, the upper and lower parts of the arc-shaped raising sections 807 are respectively the discharge end and the feed end of the arc-shaped raising sections, the discharge end of each arc-shaped raising section 807 is fixed with an inclined sliding section 808, the most downstream inclined sliding section 808 is connected with the discharge outlet 806, and the inclined lower ends of the other inclined sliding sections 808 are connected with the feed ends of the adjacent arc-shaped raising sections 807 at the downstream;
a brush roller 809 for conveying the material at the feeding end of the arc-shaped upward section 807 to the discharging end of the arc-shaped upward section 807 is arranged in the shell 801 and at each arc-shaped upward section 807, a sponge adsorption mechanism for adsorbing the moisture of the material is arranged in the shell 801 and at the most upstream inclined sliding section 808, an overturning drying mechanism for overturning and drying the material is arranged in the shell 801 and at the inclined sliding section 808 between the most upstream inclined sliding section 808 and the most downstream inclined sliding section 808, a centrifugal drying mechanism for centrifugally scattering the material is arranged at the most downstream inclined sliding section 808, and an arc-shaped material guide plate 810 is arranged in the shell 801 and right above each inclined sliding section 808;
a lower partition plate 811 which extends downwards to the bottom end of the shell 801 is fixed at the feeding end of the arc-shaped raising section 807 at the most downstream in the shell 801, the lower partition plate 811 divides the area below the boiling bed plate 804 into a hot air inlet area 812 and a cold air inlet area 813, so that the separation of cold air and hot air is realized, the materials are better dried by hot air and cooled and dried by cold air, a hot air blowing mechanism sends hot air into the hot air inlet area 812, and a cold air blowing mechanism sends cold air into the cold air inlet area 813;
an upper partition plate 814 is fixed on the arc-shaped material guide plate 810 right above the lower partition plate 811, the upper partition plate 814 divides the area in the shell 801 and above the boiling bed plate 804 into a hot air drying area 815 and a cold air drying area 816, the hot air drying area 815 corresponds to the hot air inlet area 812 and supplies hot air to flow, and the cold air drying area 816 corresponds to the cold air inlet area 813 and supplies cold air to flow.
The sponge adsorption mechanism comprises a first rotating shaft 817 which is horizontally and rotatably arranged in the shell 801, the rotating direction of the first rotating shaft 817 is opposite to that of the brush roller 809, a plurality of rotating plates 818 are arranged on the first rotating shaft 817, the rotating plates 818 are distributed along the axis of the first rotating shaft 817 in a circumferential manner, a water absorption sponge 819 is embedded on one end surface of each rotating plate 818, the end surfaces of the water absorption sponges 819 are flush with the end surfaces of the rotating plates 818, so that materials can smoothly move to the water absorption sponges 819, a first mounting seat 820 is fixed on the other end surface of each rotating plate 818, a second rotating shaft 821 is arranged between the first mounting seats 820, a pressing plate 822 for squeezing the water absorption sponges 819 on the adjacent rotating plates 818 to remove water is fixedly arranged on the second rotating shaft 821, one end of the pressing plate 822 extends out of the rotating plates 818, a first torsion spring 823 is sleeved on the second rotating shaft 821, one end 823 of the first torsion spring is connected with the first mounting seat, the first torsion spring 823 provides an elastic force for separating the pressing plate 822 from the water absorption sponge 819, a third mounting seat 824 is fixed on the upstream-most inclined sliding section 808, a third rotating shaft 825 is installed between the third mounting seats 824, a limiting plate 826 matched with the pressing plate 822 is fixedly installed on the third rotating shaft 825, a second torsion spring 827 is sleeved on the third rotating shaft 825, one end of the second torsion spring 827 is connected with the third mounting seat 824, the other end of the second torsion spring 827 is connected with the third rotating shaft 825, the second torsion spring 827 is used for providing a resistance for limiting the passage of the pressing plate 822 so as to enable the pressing plate 822 to be in contact with the water absorption sponge 819, and the elastic force of the second torsion spring 827 is greater than that of; a U-shaped limiting frame 828 is fixed on the upstream-most inclined sliding section 808 and located at the downstream of the limiting plate 826, the U-shaped limiting frame 828 is connected with the third mounting seat 824 and encloses a water accumulation area 829, a water accumulation groove 830 communicated with the water accumulation area 829 is fixed on the lower end face of the upstream-most inclined sliding section 808, a water discharge pipe 831 is installed at the bottom of the water accumulation groove 830, and the other end of the water discharge pipe 831 extends out of the shell 801.
The turning drying mechanism comprises a hollow rotating shaft 832 horizontally and rotatably installed in a shell 801, the rotating directions of the hollow rotating shaft 832 and a brush roller 809 are opposite, a plurality of 7-shaped hollow turning plates 833 are installed on the hollow rotating shaft 832, end faces on two sides of the hollow turning plates 833 and end faces facing the hollow rotating shaft 832 are provided with air vents 834, the sizes of the air vents 834 are smaller than those of particle materials, the hollow turning plates 833 are circumferentially distributed along the axis of the hollow rotating shaft 832, a plurality of 7-shaped rotary air outlet pipes 835 communicated with the hollow rotating shaft 832 are installed in the hollow turning plates 833 along the axis direction of the hollow rotating shaft 832, the end faces, facing the hollow turning plates 833, of the rotary air outlet pipes 835 are provided with the air vents 802, one end of the hollow rotating shaft 832 extends out of the shell 801 and is provided with a rotary joint 836, the other end of the rotary joint 836 is connected with a hot air supply mechanism, and the hot air supply mechanism supplies hot air to. The material can be fully turned over in the space with a triangular section surrounded by the hollow turning plate 833 to contact with hot air, and the drying effect is improved.
Centrifugal drying mechanism includes that vertical rotation installs a plurality of centrifugation pivot 837 on the most low reaches slope landing section 808, centrifugation pivot 837 passes through the bearing and installs on most low reaches slope landing section 808, centrifugation pivot 837 arranges along casing 801 width direction, centrifugation pivot 837 upper end is installed centrifugation carousel 838, each centrifugation carousel 838 is closely arranged and is higher than discharge gate 806, be less than its adjacent arc section 807 discharge end of raising upward, centrifugation pivot 837 lower extreme extends to slope landing section 808 below and installs first driven pulley 839, install centrifugal driving motor 840 in the casing 801, first drive pulley 841 is installed to centrifugal driving motor 840 output, first drive pulley 841 is connected with each first driven pulley 839 transmission through first driving belt 842.
The hot air blowing mechanism comprises an air heater 843, a tee joint 844 is installed at the output end of the air heater 843, a bottom hot air pipe 845 and an upper hot air pipe 846 are installed at two output ends of the tee joint 844 respectively, the other end of the bottom hot air pipe 845 extends to a hot air inlet area 812 and is fixed on a lower partition plate 811, the bottom hot air pipe 845 is obliquely arranged below the boiling bed plate 804 and supplies air to the boiling bed plate 804, the upper hot air pipe 846 is connected with branch pipes 847 which correspond to the hollow rotating shafts 832 one by one, and the output end of the branch pipe 847 is connected with a rotary joint 836.
The cold air blowing mechanism comprises an air blower 848, a cold air pipe 849 is installed at the output end of the air blower 848, and the other end of the cold air pipe 849 extends into the cold air inlet area 813 and is fixed on the lower partition plate 811.
Preferably, a horizontally disposed screen 850 is disposed within the housing 801 above the inlet 805. By arranging the filter screen 850, the brush roller 809 can be prevented from sweeping the calcium chloride material into the air outlet 802, and the material loss is reduced.
The boiling bed board 804 sets up with the both sides slope of casing 801 link, constitutes the U-shaped groove structure that makes the material gather in its middle part. Like this, the material can be gathered in boiling bed board 804 middle part, avoids the material to gather in boiling bed board 804 both sides, the unable brushing of brush roller 809 to the material, through setting up U-shaped groove structure for brush roller 809 can conveniently be brushed the material to sponge adsorption device, upset drying mechanism and centrifugal drying mechanism on.
For drive sponge adsorption apparatus constructs and the operation of upset drying mechanism, rotary driving mechanism has still been set up, rotary driving mechanism is including installing motor support 851 on casing 801, install rotary driving motor 852 on motor support 851, second driving pulley 853 is installed to rotary driving motor 852 output, second driven pulley 854 is all installed to each brush roller 809 one end, third driven pulley 855 is all installed to first pivot 817 and each hollow pivot 832 one end, second driving pulley 853 is connected with each second driven pulley 854 and each third driven pulley 855 transmission through second driving belt 856, the diameter of third driven pulley 855 is greater than the diameter of second driven pulley 854. Because the diameter of the third driven pulley 855 is greater than that of the second driven pulley 854, the rotating speed of the third driven pulley 855 is less than that of the second driven pulley 854, and thus the rotating speeds of the sponge adsorption mechanism and the overturning drying mechanism are less than that of the brush roller 809, so that the brush roller 809 is ensured to sweep materials at a relatively high rotating speed, the materials can be swept to the discharge end of the arc-shaped upward section 807, the sponge adsorption mechanism and the overturning drying mechanism are enabled to dry the materials at a relatively low rotating speed, the time of contact between the materials and the materials is prolonged, and the drying effect is improved; the second driven pulley 854 is rotated in the opposite direction to the third driven pulley 855 so that the materials can be dried in sequence.
When the fluidized bed drying device 8 is used, dry hot air is blown into an upper hot air pipe 846 and a lower hot air pipe by the hot air blower 843, dry normal-temperature air is blown into a cold air pipe 849 by the air blower 848, and the rotary driving motor 852 drives the second driving belt 856, the second driven belt pulley 854 and the third driven belt pulley 855 to rotate through the second driving belt pulley 853, so as to drive the brush roller 809, the first rotating shaft 817 and the hollow rotating shaft 832 to rotate; calcium chloride materials to be dried are added into the shell 801 through the material inlet, the materials fall on the most upstream arc-shaped upward section 807 under the action of gravity, the rotating brush roller 809 brushes the materials to the discharge end of the arc-shaped upward section 807, the materials are dispersed and fully contacted with air in the process of brushing the materials by the brush roller 809, the materials fall on the sponge adsorption mechanism under the guiding and limiting action of the arc-shaped material guide plate 810, then the first rotating shaft 817 drives the rotating plate 818 to rotate, the rotating plate 818 receives the materials input by the arc-shaped upward section 807 and the arc-shaped material guide plate 810, most of the materials fall on the water absorption sponge 819, the water absorption sponge 819 adsorbs the moisture of the materials, when the first rotating shaft 817 rotates by 180 degrees, the materials automatically slide down to the inclined sliding section 808 below the rotating plate 818, when the pressing plate 822 is contacted with the limiting plate 826, because the force of the second torsion spring 827 is greater than the elastic force of the first torsion spring 823, the limiting plate 826 can limit the synchronous movement of the pressing plate 822 along with the rotating, when the next rotating plate 818 rotates to the position of the limiting plate 826, the embedded water absorption sponge 819 contacts with the limited pressing plate 822, then water in the water absorption sponge 819 is squeezed out, the water flows into the water accumulation area 829 and enters the water accumulation groove 830 and is discharged by the water discharge pipe 831, then the rotating plate 818 drives the pressing plate 822 to move and overcome the resistance of the second torsion spring 827, the limiting plate 826 inclines leftwards and inclines to an open position, the pressing plate 822 passes through, under the action of the elastic restoring force of the first torsion spring 823, the pressing plate 822 resets to be away from the water absorption sponge 819 and to be attached to the corresponding rotating plate 818, and under the action of the elastic restoring force of the second torsion spring 827, the limiting plate 826 resets to block the next pressing plate 822, so that the circulation is realized, and the dehydration operation of the material water absorption and the water absorption sponge 819 is performed;
the inclined sliding section 808 guides the material to the downstream arc-shaped upward section 807, the next brush roller 809 brushes the material to enable the material to fall onto the overturning drying mechanism, the hollow overturning plate 833 receives the material, the hollow rotating shaft 832 drives the hollow overturning plate 833 to overturn, the upper hot air pipe 846 introduces hot air to the hollow rotating shaft 832 through the rotating joint 836, the hot air in the hollow rotating shaft 832 is discharged into the hollow overturning plate 833 through the rotating air outlet pipe 835 and the air outlet 802 and is discharged onto the material between the hollow overturning plates 833 through the air vent 834, so that the material is fully contacted with the hot air in the overturning process, the drying efficiency is improved, after the hollow rotating shaft 832 rotates over 180 degrees, the material gradually separates from the hollow overturning plate 833 and falls on the inclined sliding section 808, and is brushed to the next overturning drying mechanism by the brush roller 809 until the material moves to the most downstream arc-shaped upward section 807;
at the most downstream arc-shaped raising section 807 and the inclined sliding section 808, the cold air pipe 849 sends normal-temperature drying air to cool and dry the material, the brush roller 809 at the most downstream arc-shaped raising section 807 sweeps the material to the discharge end of the material, and then the material falls on a centrifugal drying mechanism, and the centrifugal drying mechanism breaks up the material and dries the material by cold air; specifically, centrifugal drive motor 840 drives first driven pulley 839 through first drive pulley 841, first drive belt 842 and rotates, and then drives each centrifugal pivot 837, centrifugal carousel 838 is rotatory, the material is mostly fallen on centrifugal carousel 838, high-speed rotatory centrifugal carousel 838 breaks up the material, avoid the material caking, cold wind blows to the material by the slope landing section 808 of downstreams simultaneously, make the material fully cool drying, the material after fully cool drying receives gravity landing to discharge gate 806.
Example 2
This example is substantially the same as example 1, except that the process for producing calcium chloride from black filtrate comprises the following steps:
1. pumping a square iron black filtrate from an iron black filtrate regulating tank 1 to a primary treatment reaction tank 2;
2. adding lime milk with the b-side concentration of 32% into the primary treatment reaction tank 2, and fully stirring and reacting to ensure that the pH of the liquid in the primary treatment reaction tank 2 is 8.8, wherein a =20, b =6.2, a: b = 10: 3.1.
3. c kg of activated carbon was added to the primary treatment reaction tank 2, and the reaction was stirred sufficiently, where c =40, a: c =1: 4;
4. filtering the liquid in the primary treatment reaction tank 2 through a plate-and-frame filter press 4, filtering out calcium chloride and iron-containing sludge, and discharging the filtered liquid to a secondary treatment reaction tank 3;
5. d kg of hydrogen peroxide is added into the secondary treatment reaction tank 3, e kg of activated carbon is added again after the mixture is fully stirred, the mixture is fully stirred and reacted, wherein d =50, e =25, a: d: e = 2: 10: 5;
6. filtering the liquid in the secondary treatment reaction tank 3 through a plate-and-frame filter press 4, and allowing the filtered liquid to enter a to-be-evaporated tank 5 and then enter a triple-effect evaporator 6 for evaporation;
7. after the evaporation of the triple-effect evaporator 6, the material is subjected to primary drying by a spray drying device 7 and secondary drying by a fluidized bed drying device 8 to prepare a calcium chloride product.
The calcium chloride produced by the embodiment has white appearance, and the content of the calcium chloride is more than 90 percent, thereby meeting the requirement of anhydrous calcium chloride.
Example 3
This example is substantially the same as example 1, except that the process for producing calcium chloride from black filtrate comprises the following steps:
1. pumping a square iron black filtrate from an iron black filtrate regulating tank 1 to a primary treatment reaction tank 2;
2. adding lime milk with the b-side concentration of 32% into the primary treatment reaction tank 2, and fully stirring and reacting to ensure that the pH of the liquid in the primary treatment reaction tank 2 is 8.9, wherein a =20, b =6.4, a: b = 10: 3.2.
3. c kg of activated carbon was added to the primary treatment reaction tank 2, and the reaction was stirred sufficiently, where c =40, a: c =1: 4;
4. filtering the liquid in the primary treatment reaction tank 2 through a plate-and-frame filter press 4, filtering out calcium chloride and iron-containing sludge, and discharging the filtered liquid to a secondary treatment reaction tank 3;
5. d kg of hydrogen peroxide is added into the secondary treatment reaction tank 3, e kg of activated carbon is added again after the mixture is fully stirred, the mixture is fully stirred and reacted, wherein d =50, e =25, a: d: e = 2: 10: 5;
6. filtering the liquid in the secondary treatment reaction tank 3 through a plate-and-frame filter press 4, and allowing the filtered liquid to enter a to-be-evaporated tank 5 and then enter a triple-effect evaporator 6 for evaporation;
7. after the evaporation of the triple-effect evaporator 6, the material is subjected to primary drying by a spray drying device 7 and secondary drying by a fluidized bed drying device 8 to prepare a calcium chloride product.
The calcium chloride produced by the embodiment has white appearance, and the content of the calcium chloride is more than 90 percent, thereby meeting the requirement of anhydrous calcium chloride.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (10)
1. The process for producing calcium chloride from iron black filtrate is characterized by comprising the following steps:
(1) pumping a square iron black filtrate from an iron black filtrate regulating tank to a primary treatment reaction tank;
(2) adding lime milk with the concentration of 32% in the b direction into the primary treatment reaction tank, and fully stirring and reacting to ensure that the PH of the liquid in the primary treatment reaction tank is 8.5-9, wherein a: b = 10: 2.7 to 3.3;
(3) c kilograms of activated carbon is added into the primary treatment reaction tank, and the stirring reaction is carried out fully, wherein a: c =1: 4;
(4) filtering the liquid in the primary treatment reaction tank by using a plate-and-frame filter press, filtering out calcium chloride and iron-containing sludge, and discharging the filtered liquid to a secondary treatment reaction tank;
(5) d kg of hydrogen peroxide is added into the secondary treatment reaction tank, e kg of active carbon is added again after the mixture is fully stirred, the mixture is fully stirred and reacted, wherein a: d: e = 2: 10: 5;
(6) filtering the liquid in the secondary treatment reaction tank by using a plate-and-frame filter press, and evaporating the filtered liquid in a triple-effect evaporator after entering an evaporation tank to be evaporated;
(7) after the evaporation of the triple-effect evaporator, the material is subjected to primary drying by a spray drying device and then secondary drying by a fluidized bed drying device to prepare a calcium chloride product.
2. A fluidized bed drying device for producing calcium chloride from iron black filtrate comprises a shell, a hot air blowing mechanism, a cold air blowing mechanism, an air outlet arranged at the top of the shell and a fluidized bed plate arranged in the shell and provided with a vent hole, wherein the size of the vent hole is smaller than that of a particle material;
the boiling bed plate comprises a plurality of arc-shaped upward sections which are gradually reduced from a feed inlet to a discharge outlet, the upper and lower parts of each arc-shaped upward section are respectively a discharge end and a feed end, the discharge end of each arc-shaped upward section is fixedly provided with an inclined sliding section, the inclined sliding section at the most downstream is connected with the discharge outlet, and the inclined lower ends of the other inclined sliding sections are connected with the feed ends of the adjacent arc-shaped upward sections at the downstream;
the device is characterized in that brush rollers for conveying materials at the feeding end of the arc-shaped upward sections to the discharging end of the arc-shaped upward sections are arranged in the shell and at the positions of the arc-shaped upward sections, sponge adsorption mechanisms for adsorbing material moisture are arranged at the positions of the uppermost stream inclined sliding sections in the shell and at the positions of the lowermost stream inclined sliding sections, overturning and drying mechanisms for overturning and drying the materials are arranged at the positions of the uppermost stream inclined sliding sections and the lowermost stream inclined sliding sections in the shell, centrifugal drying mechanisms for centrifugally scattering the materials are arranged at the positions of the lowermost stream inclined sliding sections, and arc-shaped guide plates are arranged in the shell and right above the inclined sliding sections;
a lower partition plate extending downwards to the bottom end of the shell is fixed at the feeding end of the downstream arc-shaped raising section in the shell, the lower partition plate divides the area below the boiling bed plate into a hot air inlet area and a cold air inlet area, the hot air blowing mechanism supplies hot air to the hot air inlet area, and the cold air blowing mechanism supplies cold air to the cold air inlet area;
an upper baffle plate is fixed on the arc-shaped material guide plate right above the lower baffle plate, and the upper baffle plate divides the area in the shell and above the boiling bed plate into a hot air drying area and a cold air drying area.
3. The ebullated bed drying device for producing calcium chloride from iron black filtrate according to claim 2, comprising a sponge absorbing mechanism including a first rotating shaft horizontally rotatably installed in the housing, the first rotating shaft and the brush roller rotate in opposite directions, a plurality of rotating plates are installed on the first rotating shaft, the rotating plates are circumferentially distributed along the axis of the first rotating shaft, a water absorbing sponge is embedded on one end surface of each rotating plate, a first installation seat is fixed on the other end surface of each rotating plate, a second rotating shaft is installed between the first installation seats, a pressing plate for squeezing and removing water from the water absorbing sponge on the adjacent rotating plate is fixedly installed on the second rotating shaft, one end of each pressing plate extends out of the corresponding rotating plate, a first torsion spring is sleeved on the second rotating shaft, one end of each first torsion spring is connected with the first installation seat, the other end of each first torsion spring is connected with the second rotating shaft, the first torsion spring provides elastic force for separating the pressing plate from the water absorbing, a third mounting seat is fixed on the uppermost stream inclined sliding section, a third rotating shaft is mounted between the third mounting seats, a limiting plate matched with the pressing plate is fixedly mounted on the third rotating shaft, a second torsion spring is sleeved on the third rotating shaft, one end of the second torsion spring is connected with the third mounting seat, the other end of the second torsion spring is connected with the third rotating shaft, the second torsion spring is used for providing resistance for limiting the pressing plate to pass through so that the pressing plate is contacted with the water absorption sponge, and the elasticity of the second torsion spring is greater than that of the first torsion spring; and a U-shaped limiting frame is fixed on the upstream inclined sliding section and is positioned at the downstream of the limiting plate, the U-shaped limiting frame is connected with the third mounting seat and is enclosed into a water accumulation area, a water accumulation groove communicated with the water accumulation area is fixed on the lower end surface of the upstream inclined sliding section, a drain pipe is installed at the bottom of the water accumulation groove, and the other end of the drain pipe extends out of the shell.
4. The fluidized bed drying device for producing calcium chloride from iron black filtrate according to claim 3, comprising a hollow rotating shaft horizontally and rotatably mounted in the housing, the hollow rotating shaft is opposite to the brush roller in rotation direction, a plurality of 7-shaped hollow turnover plates are mounted on the hollow rotating shaft, air vents are respectively arranged on the end surfaces of both sides of the hollow turnover plates and the end surface facing the hollow rotating shaft, the size of the air vents is smaller than that of the granular materials, the hollow turnover plates are circumferentially distributed along the axis of the hollow rotating shaft, a plurality of 7-shaped rotary air outlet pipes communicated with the hollow rotating shaft are mounted in the hollow turnover plates along the axis direction of the hollow rotating shaft, air outlets are arranged on the end surfaces facing the hollow turnover plates and provided with the air vents, one end of the hollow rotating shaft extends out of the housing and is provided with a rotary joint, and the other end of the rotary joint is connected with an air supply mechanism, the hot air supply mechanism supplies hot air to the hollow rotating shaft through the rotary joint.
5. The ebullated bed drying device for producing calcium chloride from iron black filtrate according to claim 2, comprising a plurality of centrifugal rotating shafts vertically rotatably mounted on the downstream-most inclined falling section, the centrifugal rotating shafts are arranged along the width direction of the shell, the centrifugal rotating discs are mounted at the upper ends of the centrifugal rotating shafts, the centrifugal rotating discs are closely adjacent to and higher than the discharge port and lower than the discharge port of the adjacent arc-shaped lifting section, the lower ends of the centrifugal rotating shafts extend to the lower part of the inclined falling section and are provided with first driven pulleys, a centrifugal driving motor is mounted in the shell, a first driving pulley is mounted at the output end of the centrifugal driving motor, and the first driving pulley is in transmission connection with the first driven pulleys through a first transmission belt.
6. The ebullated bed drying apparatus for producing calcium chloride from iron black filtrate as claimed in claim 2, comprising, wherein the hot air blowing mechanism comprises a hot air blower, a tee is installed at an output end of the hot air blower, a bottom hot air duct and an upper hot air duct are respectively installed at two output ends of the tee, the other end of the bottom hot air duct extends to the hot air inlet area and is fixed on the lower partition plate, the bottom hot air duct is obliquely arranged below the ebullated bed plate and supplies air to the ebullated bed plate, the upper hot air duct is connected with branch pipes corresponding to the hollow rotating shafts one by one, and output ends of the branch pipes are connected with the rotary joint.
7. The ebullated bed drying apparatus for producing calcium chloride from iron black filtrate according to claim 2, comprising a cold air blowing mechanism including an air blower, wherein a cold air pipe is installed at an output end of the air blower, the other end of the cold air pipe extends into the cold air inlet area and is fixed on the lower partition plate, and the cold air pipe blows air to the ebullated bed plate below the ebullated bed plate.
8. The ebullated bed drying apparatus for producing calcium chloride from iron black filtrate according to claim 2, comprising a horizontally disposed filter screen disposed in the casing above the feed inlet.
9. The ebullated bed drying apparatus for producing calcium chloride from iron black filtrate according to claim 2, comprising a U-shaped groove structure, wherein the ebullated bed plate is disposed obliquely upward on both sides of the end where the ebullated bed plate is connected to the casing, and the U-shaped groove structure allows the materials to accumulate in the middle of the U-shaped groove structure.
10. The ebullated bed drying device for producing calcium chloride from iron black filtrate according to claim 4, comprising a rotary driving mechanism for driving the sponge adsorption mechanism and the turnover drying mechanism to operate, wherein the rotary driving mechanism comprises a motor bracket mounted on the housing, a rotary driving motor is mounted on the motor bracket, a second driving pulley is mounted at the output end of the rotary driving motor, a second driven pulley is mounted at one end of each brush roller, a third driven pulley is mounted at one end of each hollow rotating shaft and the first rotating shaft, the second driving pulley is in transmission connection with each second driven pulley and each third driven pulley through a second transmission belt, and the diameter of the third driven pulley is larger than that of the second driven pulley.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113350878A (en) * | 2021-07-02 | 2021-09-07 | 河北恒创环保科技有限公司 | High-zinc waste hydrochloric acid zinc extraction process and plate-and-frame filter press used for same |
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| GB358113A (en) * | 1930-07-05 | 1931-10-05 | Ig Farbenindustrie Ag | Process for the manufacture of complex salts of aromatic compounds |
| CN1749173A (en) * | 2004-09-15 | 2006-03-22 | 刘应兵 | Comprehensively utilizing new process for ferrous sulfate |
| CN107473270A (en) * | 2017-09-25 | 2017-12-15 | 杭州金丰环保科技有限公司 | A kind of method that iron oxide black and calcium chloride are prepared using steel plant's spent acid |
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2021
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB358113A (en) * | 1930-07-05 | 1931-10-05 | Ig Farbenindustrie Ag | Process for the manufacture of complex salts of aromatic compounds |
| CN1749173A (en) * | 2004-09-15 | 2006-03-22 | 刘应兵 | Comprehensively utilizing new process for ferrous sulfate |
| CN107473270A (en) * | 2017-09-25 | 2017-12-15 | 杭州金丰环保科技有限公司 | A kind of method that iron oxide black and calcium chloride are prepared using steel plant's spent acid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113350878A (en) * | 2021-07-02 | 2021-09-07 | 河北恒创环保科技有限公司 | High-zinc waste hydrochloric acid zinc extraction process and plate-and-frame filter press used for same |
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