CN107055993B - Equipment and process method for copper-containing sludge granulation and pre-drying - Google Patents
Equipment and process method for copper-containing sludge granulation and pre-drying Download PDFInfo
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- CN107055993B CN107055993B CN201710351189.2A CN201710351189A CN107055993B CN 107055993 B CN107055993 B CN 107055993B CN 201710351189 A CN201710351189 A CN 201710351189A CN 107055993 B CN107055993 B CN 107055993B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses equipment and a process method for copper-containing sludge granulation and pre-drying, wherein the equipment comprises a hoister, a material stabilizing bin, a front-mounted bin, a pre-water adding stirrer, a rear-mounted bin, a granulator and the like; the front-mounted bin is provided with a bin integral weighing device, and the bottom of the bin integral weighing device is provided with a pneumatic valve; the pre-water-adding stirrer realizes stirring and scattering, an atomizing nozzle is arranged above the inner part of the pre-water-adding stirrer, the atomizing nozzle is connected with a water supply device to realize accurate water distribution, and a material loading level indicator and a material unloading level indicator are arranged on the post-positioned material bin; the rear material bin, the granulator and the drying and screening device are used for conveying materials through a belt conveyor. The method of the invention accurately distributes water to the mixed powder, fully stirs the materials in a three-dimensional stirring mode, forms wet materials with uniform water content in 3 minutes, can prepare material balls with consistent particles, improves the stacking porosity during sintering, greatly reduces the phenomenon of cracking caused by nonuniform inside and outside when the material balls are heated, greatly reduces the phenomenon of nonuniform ventilation of the section of the kiln, and can reduce 300-400KJ/kg of heat wasted by evaporating water.
Description
Technical Field
The invention relates to equipment and a process method for copper-containing sludge granulation and pre-drying, and belongs to the technical field of hazardous waste resource recycling.
Background
The sludge containing copper belongs to HW17 category in national hazardous waste list, mainly comes from sludge generated in the waste water treatment process of industries such as metal surface treatment, heat treatment processing, electronic component manufacturing, electroplating and basic chemical raw material manufacturing, and the sludge containing heavy metal has the characteristics of easy accumulation, instability, easy loss and the like, and can cause serious environmental pollution if not properly treated.
Most of the sludge recycling modes are brick making, ceramic granule making and the like, the sludge recycling system has the advantages of high efficiency, economy and low operating cost, can improve storage and transportation conditions, can realize harmless utilization of sludge, and avoids pollution to the environment. The preparation process usually includes the procedures of drying, stirring, granulating, drying, sintering and the like, wherein the sintering needs to consume a large amount of fuel, and high energy consumption is easily caused. The invention patent 201110149124.2 discloses a method for treating and utilizing sludge, which comprises the steps of drying, stirring, granulating, sintering, crushing, dedusting and screening the sludge, and firing the sludge into ceramsite which can be utilized by people. The granules prepared by the method are large and obtained by crushing and screening, and the problems of complex working procedures and low quality of fired ceramsite exist. Chinese patent 201611178461.3 discloses a method for treating copper-containing sludge, which comprises the following steps: drying the copper-containing sludge at low temperature by using a dryer; after being discharged from a discharge port of the low-temperature dryer, the dried copper-containing sludge is sent to a double-roller extrusion granulator to be prepared into granular copper-containing sludge; sending the granular copper-containing sludge to a belt dryer for drying; and sending the dried granular copper-containing sludge to an ore copper smelting system for smelting. Although the method can produce the blister copper, the raw materials for smelting become waste slag.
In the actual production process, the shapes of the pellets prepared by the granulator are often inconsistent because of uneven material stirring, the pellets are prone to bursting due to uneven internal and external heating during sintering, and high-quality ceramsite is difficult to prepare. In addition, before the copper-containing sludge is disposed, in order to facilitate stacking and conveying, the copper-containing sludge is usually dried in the shade, the surface of the sludge is partially dried, and the inside of the sludge also contains 50-70% of water. The invention provides a more optimized copper-containing sludge treatment device and a more optimized copper-containing sludge treatment process.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides equipment and a process method for copper-containing sludge granulation and pre-drying, which can improve the quality of material balls made of copper-containing sludge, improve the production efficiency and reduce the energy consumption of equipment.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:
a copper-containing sludge granulation and pre-drying device comprises a hoister, a material stabilizing bin, a feeding device, a preposed bin, a pre-watering stirrer, a postpositional bin, a granulator and a drying and screening device which are arranged along the material treatment direction; the pre-feeding mixer and the post-feeding bin are arranged from top to bottom, a bin integral weighing device is arranged on the pre-feeding bin, and a pneumatic valve is arranged at the bottom of the pre-feeding bin; the pre-watering mixer realizes mixing and scattering, an atomizing nozzle is arranged above the pre-watering mixer and connected with a water supply device, and a pneumatic discharge valve is arranged at the bottom of the pre-watering mixer; a material loading level meter and a material unloading level meter are arranged on the rear material bin, and a metering belt scale is arranged below the rear material bin; and materials are conveyed among the rear storage bin, the granulator and the drying and screening device through a belt conveyor.
Preferably, the material stabilizing bin is provided with a weighing sensor, an overflow port is formed in the top of the material stabilizing bin, and redundant materials can return to the elevator through the overflow port.
Preferably, in order to realize accurate water distribution in the stirrer, the water supply device comprises a screw pump, a water tank, a water pump and an electro-hydraulic reversing valve; the screw pump is used for conveying water in the water tank to an atomizing nozzle in the pre-watering stirrer through the electro-hydraulic reversing valve; the electro-hydraulic reversing valve is respectively connected with the atomizing nozzle, the screw pump and the water tank through water pipelines.
Preferably, the pre-watering stirrer is used for stirring and scattering materials in a mode of combining a forward double-spiral belt, a plough-shaped stirring knife and a high-speed fly knife. The materials are fully stirred by adopting a three-dimensional stirring mode, and wet materials with uniform water content can be formed in 3 minutes.
Preferably, the drying and screening device is provided with a ball inlet, a ball outlet, a hot air inlet, an exhaust port and a waste outlet; the hot air inlet is connected with a hot air discharge port of the sintering furnace, the material balls are dried by using the waste heat of the furnace, and the exhaust port is connected with the dust remover.
Preferably, a waste material outlet of the drying and screening device is connected to the granulator through a belt conveyor, and unqualified powder is returned to the granulator for granulation again.
A process method for copper-containing sludge granulation and pre-drying comprises the following steps:
(1) Quantitatively weighing and feeding mixed powder containing copper sludge, quicklime and carbon powder;
(2) Spraying and adding water into the weighed mixed powder for prewetting and stirring, wherein the water is supplied under the constant high pressure of 0.8-1.2Mpa for accurate water distribution; fully stirring the materials in a three-dimensional stirring mode to form wet materials with uniform water content within 3 minutes, wherein the weight ratio of the water to the materials is 3.5-7%;
(3) Metering the stirred wet material powder, and continuously conveying the wet material powder to a granulator for granulation;
(4) And drying and screening the pellets, feeding qualified finished products into a sintering machine for sintering, and returning unqualified powder to a granulator for re-granulation.
Preferably, when water is sprayed and added in the step (2), the water is conveyed to the atomizing spray head at the pressure of 0.8-1.2Mpa, and when the raw material powder is pre-wetted, the atomizing pressure of the spray head is 1-1.2Mpa, and the diameter of the atomized water drops is 50-150 mu m.
Preferably, the three-dimensional stirring mode in the step (2) is a mode of combining a positive and negative double-helical belt, a plow-shaped stirring knife and a high-speed fly knife to stir the materials, when the weight ratio of water to the materials is 3.5-7%, the moisture content unevenness of the raw material is less than or equal to 5% after stirring for 1 minute, and the moisture content unevenness of the raw material is less than or equal to 1% after stirring for 3 minutes.
Preferably, in the step (3), the granulator granulates to have a particle size of 5-8 mm.
Has the advantages that: compared with the prior art, the invention has the following advantages: 1. the invention can fully scatter and stir the materials in the pre-watering stirrer, can fully utilize the original water in the sludge, realize accurate water distribution, reduce the unevenness of the moisture content of raw materials and can produce material balls with consistent particles. 2. The invention is provided with three-level material bins of a material stabilizing bin, a front material bin and a rear material bin, and accurately weighs each material bin, thereby realizing continuous treatment of copper-containing sludge. 3. The pellets prepared by the method are uniform, the porosity of the pellets dried on the surface is increased during sintering, the phenomenon that the pellets are cracked due to nonuniform inside and outside when being heated is greatly reduced, the phenomenon that the cross section of the kiln is ventilated unevenly is greatly reduced, and the heat wasted by evaporating water can be reduced by 300-400KJ/KG.
Drawings
Fig. 1 is a schematic view of an apparatus according to an embodiment of the present invention.
In the figure 1, 1-a hoisting machine, 2-a material stabilizing bin, 3-a weighing sensor, 4-a feeding device, 5-a front bin, 6-a bin integral weighing device, 7-a pneumatic valve, 8-a pre-water-adding stirrer, 9-a pneumatic discharge valve, 10-a screw pump, 11-a water tank, 12-a water pump, 13-an electro-hydraulic reversing valve, 14-an atomizing nozzle, 15-a material loading level meter, 16-a material unloading level meter, 17-a rear bin, 18-a metering belt scale, 20-a granulator, 22-a drying and screening device, and 19, 21, 23 and 24-a belt conveyer.
FIG. 2 is a flow chart of a process according to an embodiment of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
Example 1
As shown in fig. 1, the copper-containing sludge granulation and pre-drying equipment disclosed in the embodiment of the invention comprises a hoister 1, a material stabilizing bin 2, a feeding device 4, a front-mounted bin 5, a pre-watering stirrer 8, a rear-mounted bin 17, a granulator 20 and a drying and screening device 22 which are arranged along the material treatment direction. The materials are conveyed among the post-positioned material bin 17, the granulator 20 and the drying and screening device 22 through belt conveyors 19 and 21, and the dried material balls are conveyed to the sintering furnace through a belt conveyor 24. Leading feed bin 5, add water mixer 8, rearmounted feed bin 17 in advance from top to bottom sets up, carry the steady feed bin 2 with raw powder material through lifting machine 1, is equipped with weighing sensor 3 and overflow mouth on the steady feed bin 2. The front-mounted bin 5 is provided with a bin integral weighing device 6, and the bottom of the bin integral weighing device is provided with a pneumatic valve 7. The pre-watering stirrer 8 adopts a three-dimensional stirring mode, adopts a mode of combining a positive and negative double-helical belt, a plow-shaped stirring knife and a high-speed (1400 rpm and above) flying knife to stir materials, breaks up wet materials while stirring, is provided with an atomizing nozzle 14 above the inside of the pre-watering stirrer 8, is connected with a water supply device, and is provided with a pneumatic discharge valve 9 at the bottom of the pre-watering stirrer 8. The rear material bin 17 is provided with a material loading level indicator 15 and a material unloading level indicator 16, a metering belt scale 18 is arranged below the rear material bin 17, and wet materials are conveyed to a belt conveyor 19 through the metering belt scale 18.
The water supply device can realize accurate water distribution and comprises a screw pump 10, a water tank 11, a water pump 12 and an electro-hydraulic reversing valve 13; the water pump 12 is used for supplying water to the water tank 11, and the screw pump 10 is used for conveying the water in the water tank 11 to the atomizing nozzle 14 in the pre-watering stirrer 8 through the electro-hydraulic reversing valve 13; the electro-hydraulic directional valve 13 is respectively connected with the atomizing nozzle 14, the screw pump 10 and the water tank 11 through water pipelines. The water content of wet materials in the pre-watering stirrer 8 can be monitored on line through a sensor, the electro-hydraulic reversing valve 13 is controlled to reverse when the water content reaches a set range, and the screw pump 10 stops working.
The drying and screening device 22 can be a drying roller screen, realizes the drying and screening of wet pellets simultaneously, is provided with a pellet inlet, a pellet outlet, a hot air inlet, an exhaust port and a waste outlet, the hot air inlet is connected with a hot air discharge port of a sintering furnace, the pellets are dried by using the waste heat of the kiln, and the exhaust port is connected with a dust remover.
The working process of the equipment in the embodiment is as follows: feeding the prepared mixed raw material powder containing copper sludge, quicklime and carbon powder into a weighing and stabilizing bin 2 by a lifter 1, and returning the redundant powder to the lifter through an overflow port at the top; weighing the feeding device 4 (such as a spiral metering reamer) below the material stabilizing bin 2, quantitatively feeding raw material powder into the preposed bin 5, arranging a bin integral weighing device 6 (such as a tension sensor) on the preposed bin 5, weighing the whole bin, controlling the feeding device 4 to stop feeding when the total amount of raw material reaches the required rated amount, then controlling the pneumatic valve 7 at the bottom of the preposed bin 5 to open, stirring the raw material fed composite pre-adding water stirrer 8, supplying water of a required certain proportion to the water tank 11 by the water pump 12, then conveying the water to the atomizing nozzle 14 by the screw pump 10 according to the required pressure, controlling the flow direction of the water by the electro-hydraulic reversing valve 13, and when the required water amount is reached, reversing the electro-hydraulic reversing valve 13 performs reversing action, and directly returning the water output by the screw pump 10 to the water tank 11.
Raw material powder which is provided with a certain proportion of water is evenly stirred, a pneumatic discharge valve 9 is opened, wet material powder is fed into a rear material storage bin 17, a material loading level meter 15 and a material unloading level meter 16 are arranged on the rear material storage bin, the wet material quantity in the storage bin is ensured to be stable, then the wet material powder is metered by a metering belt scale 18 at the bottom of the storage bin, the wet material powder is continuously fed into a granulator 20 for granulation by a belt conveyor 19, then the wet material powder is fed into a drying screening device 22 for screening by a belt conveyor 21, unqualified powder is screened out, hot air is input from a hot air port on the side face to dry the material, dried waste gas enters a bag-type dust collector from an exhaust port on the upper portion to be collected, the unqualified powder material returns to the granulator 20 through the belt conveyor 23 to be granulated again, and qualified finished products are fed into a kiln to be calcined by the belt conveyor 24.
Example 2
As shown in fig. 2, the process for granulating and pre-drying the copper-containing sludge disclosed by the embodiment of the invention, which can adopt the equipment of the embodiment 1, mainly comprises the following steps:
1) And (3) carrying out intermittent circulating quantitative weighing on the mixed powder containing the copper sludge, the quicklime and the carbon powder and feeding. Wherein the weight portion of the quicklime is 10-18%, the weight portion of the carbon powder is 5-7%, the rest is the sludge containing copper, and the water content in the sludge containing copper is 50-70%.
2) Spraying and adding water into the weighed mixed powder for prewetting and stirring, wherein the water is supplied under the constant high pressure of 0.8-1.2Mpa for precise water distribution; fully stirring the materials in a three-dimensional stirring mode to form wet materials with uniform water content within 3 minutes, wherein the weight ratio of the water to the materials is 3.5-7%. In the step, when the raw material powder is prewetted, the atomization pressure of the spray head is between 1 and 1.2Mpa, and the diameter of atomized water drops is between 50 and 150 mu m. The three-dimensional stirring mode is a mode of combining a positive and negative double helical belt, a plow-shaped stirring knife and a high-speed fly knife to stir the materials, when the weight ratio of water to the materials is 3.5-7%, the stirring is carried out for 1 minute, the moisture content unevenness of the raw materials is less than or equal to 5%, the stirring is carried out for 3 minutes, and the moisture content unevenness of the raw materials is less than or equal to 1%.
3) And metering the stirred wet material powder, and continuously conveying the wet material powder to a granulator for granulation. The grain diameter of the granules is between 5 and 8 mm.
4) And (4) drying and screening the pellets, feeding qualified finished products into a sintering machine for sintering, and returning unqualified powder (with smaller particle size) to a granulator for re-granulation. In the step, the material balls granulated by the granulator are sent to a drying roller screen to screen out the granules and the powder, and the material section is dried by using the waste heat of a kiln to remove the surface moisture of the material balls. The material balls after being screened and dried are calcined in a kiln, the porosity is increased due to the uniform accumulation of the size of the material balls, the ventilation resistance of the section of the kiln is reduced, the phenomenon that the material balls burst due to the nonuniform inside and outside when being heated is greatly reduced, and the phenomenon that the ventilation of the section of the kiln is nonuniform is also greatly reduced.
The process of the invention is illustrated below by way of example with 1 ton of copper-containing sludge mixed powder.
Example 1:
(1) 980kg of mixed powder containing copper sludge (with the water content of 60 +/-2 percent), 15kg of quicklime and 5kg of carbon powder is weighed quantitatively and fed into a preposed feed bin, after the preposed feed bin reaches the set limit of 1 ton, a bottom pneumatic valve is opened, and the mixed powder falls into a pre-watering stirrer completely.
(2) Spraying and adding water to the weighed mixture powder for prewetting and stirring, wherein the water is supplied under constant high pressure of 0.8-1.2Mpa, the atomization pressure of a spray head is 1-1.2Mpa, the diameter of atomized water drops is 50-150 mu m, the wet material is stirred and scattered by a high-speed fly cutter while the water is added, and the water-material weight ratio is 5 percent after stirring for 3 minutes.
(3) And (3) metering the stirred wet material powder, and then continuously conveying the wet material powder to a granulator for granulation, wherein the particle size of the granulation is 5-8 mm.
(4) And drying and screening the pellets, feeding qualified finished products into a sintering machine for sintering, and returning unqualified powder to a granulator for re-granulation.
The prebaked pellets produced in this example were sintered in a sintering furnace for 1.5 hours, and the proportion of the popped pellets was 2%.
Example 2:
(1) 975kg of copper-containing sludge (with the water content of 50 +/-2%), 18kg of quicklime and 7kg of carbon powder are quantitatively weighed and fed into a preposed feed bin, after the preposed feed bin reaches the set limit of 1 ton, a bottom pneumatic valve is opened, and all the mixed powder falls into a pre-watering stirrer.
(2) Spraying and adding water to the weighed mixture powder for prewetting and stirring, wherein the water is supplied under constant high pressure of 0.8-1.2Mpa, the atomization pressure of a spray head is 1-1.2Mpa, the diameter of atomized water drops is 50-150 mu m, the wet material is stirred and scattered by a high-speed fly cutter while the water is added, and the water-material weight ratio is 7 percent after stirring for 3 minutes.
(3) And (3) metering the stirred wet material powder, and then continuously conveying the wet material powder to a granulator for granulation, wherein the particle size of the granulation is 5-8 mm.
(4) And (4) drying and screening the pellets, feeding qualified finished products into a sintering machine for sintering, and returning unqualified powder to a granulator for granulation again.
The pre-dried pellets produced in this example were sintered in a sintering furnace for 1.8 hours, and the percentage of cracked pellets was 3%.
The examples show that the equipment and the process for granulating and pre-drying the copper-containing sludge can effectively treat the copper-containing sludge, improve the treatment efficiency of the copper-containing sludge, reduce the energy consumption of treatment equipment and produce high-quality pellets.
Claims (9)
1. The utility model provides a copper-containing sludge granulation and equipment of predrying which characterized in that: the device comprises a lifter (1), a material stabilizing bin (2), a feeding device (4), a preposed bin (5), a pre-watering stirrer (8), a postposition bin (17), a granulator (20) and a drying and screening device (22) which are arranged along the material processing direction; the pre-feeding bin (5), the pre-water-feeding stirrer (8) and the post-feeding bin (17) are arranged from top to bottom, a bin integral weighing device (6) is arranged on the pre-feeding bin (5), and a pneumatic valve (7) is arranged at the bottom; the pre-watering stirrer (8) is used for stirring and scattering materials in a mode of combining a forward double-helical belt, a reverse double-helical belt, a plow-shaped stirring knife and a high-speed fly knife, an atomizing nozzle (14) is arranged above the interior of the pre-watering stirrer, the atomizing nozzle (14) is connected with a water supply device, and a pneumatic discharge valve (9) is arranged at the bottom of the pre-watering stirrer (8); a feeding level indicator (15) and a discharging level indicator (16) are arranged on the rear material bin (17), and a metering belt scale (18) is arranged below the rear material bin (17); materials are conveyed among the rear material bin (17), the granulator (20) and the drying and screening device (22) through a belt conveyer; the water content of the copper-containing sludge is 50-70%; the pre-watering stirrer (8) sprays and adds water to the weighed mixture powder for pre-wetting stirring, and the water is supplied by adopting constant high pressure of 0.8-1.2Mpa for accurate water distribution; fully stirring the materials in a three-dimensional stirring mode to form wet materials with uniform water content within 3 minutes, wherein the weight ratio of the water to the materials is 3.5-7%.
2. The equipment for granulating and predrying copper-containing sludge according to claim 1, wherein the equipment comprises: the material stabilizing bin (2) is provided with a weighing sensor (3), and the top of the material stabilizing bin (2) is provided with an overflow port.
3. The copper-containing sludge granulation and pre-drying equipment according to claim 1, characterized in that: the water supply device comprises a screw pump (10), a water tank (11), a water pump (12) and an electro-hydraulic reversing valve (13); the water pump (12) is used for supplying water to the water tank (11), and the screw pump (10) is used for conveying the water in the water tank (11) to an atomizing nozzle (14) in the pre-water-adding stirrer (8) through the electro-hydraulic reversing valve (13); the electro-hydraulic reversing valve (13) is respectively connected with the atomizing nozzle (14), the screw pump (10) and the water tank (11) through water pipelines.
4. The equipment for granulating and predrying copper-containing sludge according to claim 1, wherein the equipment comprises: the drying and screening device (22) is provided with a ball inlet, a ball outlet, a hot air inlet, an exhaust port and a waste outlet; the hot air inlet is connected with a hot air discharge port of the sintering furnace, the material balls are dried by using the waste heat of the furnace, and the exhaust port is connected with the dust remover.
5. The equipment for granulating and predrying copper-containing sludge according to claim 1, wherein the equipment comprises: and a waste material outlet of the drying and screening device (22) is connected to the granulator (20) through a belt conveyor, and unqualified powder is returned to the granulator (20) for granulation again.
6. The process method for granulating and pre-drying the copper-containing sludge by adopting the equipment according to claim 1 is characterized by comprising the following steps of:
(1) Quantitatively weighing and feeding mixed powder containing copper sludge, quicklime and carbon powder;
(2) Spraying and adding water into the weighed mixed powder for prewetting and stirring, wherein the water is supplied under the constant high pressure of 0.8-1.2Mpa for accurate water distribution; fully stirring the materials in a three-dimensional stirring mode to form wet materials with uniform water content within 3 minutes, wherein the weight ratio of the water to the materials is 3.5-7%;
(3) Metering the stirred wet material powder, and continuously conveying the wet material powder to a granulator for granulation;
(4) And (4) drying and screening the pellets, feeding qualified finished products into a sintering machine for sintering, and returning unqualified powder to a granulator for re-granulation.
7. The process method for granulating and prebaking copper-containing sludge as claimed in claim 6, wherein the process method comprises the following steps: when spraying and adding water in the step (2), the water is conveyed to the atomizing spray head under the pressure of 0.8-1.2Mpa, and when prewetting the raw material powder, the atomizing pressure of the spray head is between 1-1.2Mpa, and the diameter of atomized water drops is between 50-150 mu m.
8. The process method for granulating and prebaking copper-containing sludge as claimed in claim 6, wherein the process method comprises the following steps: the three-dimensional stirring mode in the step (2) is a mode of combining a positive and negative double-helical belt, a plow-shaped stirring knife and a high-speed fly knife to stir the materials, when the weight ratio of water to the materials is 3.5-7%, after stirring for 1 minute, the moisture content unevenness of the raw material is less than or equal to 5%, and after stirring for 3 minutes, the moisture content unevenness of the raw material is less than or equal to 1%.
9. The process method for granulating and prebaking copper-containing sludge according to claim 6, characterized by comprising the following steps: in the step (3), the grain diameter of the granules granulated by the granulator is between 5 and 8 mm.
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| CN205223032U (en) * | 2015-12-09 | 2016-05-11 | 漳州微水固体废物处置有限公司 | Utilize production system of heavy metal mud preparation light haydite |
| CN206828337U (en) * | 2017-05-18 | 2018-01-02 | 江苏金圆新材科技有限公司 | A kind of copper-contained sludge is granulated and the equipment of prebake |
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2017
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