Zinc-containing hazardous waste disposal system

Abstract

The utility model provides a zinc-containing hazardous waste disposal system which comprises an incineration rotary kiln used for incinerating zinc-containing waste raw materials; after the zinc-containing waste raw materials are incinerated, flue gas and solid kiln slag are generated; the feeding device is used for feeding zinc-containing waste raw materials to the incineration rotary kiln; the compatibility device is arranged at the downstream of the incineration rotary kiln, and is used for receiving kiln slag and quantitatively preparing and burdening materials to obtain a mixture; the volatilization rotary kiln is arranged at the downstream of the compatibility device and is used for receiving the mixture and carrying out reaction to extract volatile metal zinc; and the product collecting device is arranged at the downstream of the volatilization rotary kiln and is used for receiving gaseous metal zinc and converting the gaseous metal zinc into solid zinc oxide.

Description

Technical Field

[0001] This utility model relates to the field of hazardous waste treatment technology, and in particular to a zinc-containing hazardous waste disposal system. Background Technology

[0002] Incineration can effectively destroy toxic, hazardous, and organic waste, making it the fastest and most effective technology for achieving the harmlessness, reduction, and resource recovery of hazardous waste. After nearly 30 years of development, incineration technology for treating hazardous waste has become quite mature. Among them, rotary kiln incinerators are the mainstream furnaces used for incinerating industrial hazardous waste.

[0003] Incineration is suitable for hazardous waste, but it cannot effectively recover its useful components. After zinc-containing organic hazardous waste is treated in a rotary kiln incineration, valuable components such as zinc are ultimately distributed in the slag and fly ash, requiring disposal by qualified units. This fails to achieve resource recovery and severely restricts the economic benefits of enterprises. Therefore, it is necessary to provide a novel rotary kiln process configuration to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a zinc-containing hazardous waste disposal system to solve the problems in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a zinc-containing hazardous waste disposal system, comprising:

[0006] A rotary kiln for incinerating zinc-containing waste materials; the zinc-containing waste materials produce flue gas and solid kiln slag after incineration.

[0007] A feeding device is used to feed the zinc-containing waste material into the incineration rotary kiln;

[0008] A mixing device, located downstream of the rotary kiln, is used to receive the kiln slag and to quantitatively prepare and mix the materials to obtain a mixture.

[0009] A volatile rotary kiln, located downstream of the mixing device, is used to receive the mixture and react it to extract volatile metallic zinc.

[0010] A product collection device is located downstream of the volatilization rotary kiln to receive gaseous metallic zinc and convert it into solid zinc oxide.

[0011] In one embodiment, the zinc-containing hazardous waste disposal system further includes a collection and conveying device, which is disposed between the incineration rotary kiln and the blending device, for collecting the kiln slag produced by the incineration rotary kiln and conveying the kiln slag to the blending device;

[0012] The collection and conveying device includes a collection device, a storage tank, and a conveying device. The collection device is used to collect the kiln slag from the rotary kiln into the storage tank, the storage tank is used to store the kiln slag, and the conveying device is used to convey the kiln slag in the storage tank to the blending device.

[0013] In one embodiment, the zinc-containing hazardous waste disposal system further includes a first waste heat recovery device, which is connected to the flue gas outlet of the incineration rotary kiln to receive the flue gas and recover the heat from the flue gas.

[0014] The zinc-containing hazardous waste disposal system also includes a first purification device located downstream of the first waste heat recovery device, which is used for removing smoke and dust, desulfurization, and denitrification.

[0015] In one embodiment, the zinc-containing hazardous waste disposal system further includes a second waste heat recovery device, which is connected to the gas outlet of the volatilization rotary kiln to receive the gas from the volatilization rotary kiln and recover and utilize the heat.

[0016] In one embodiment, the zinc-containing hazardous waste disposal system further includes a second purification device located downstream of the volatilization rotary kiln, the second purification device being connected to the gas outlet of the volatilization rotary kiln to purify the flue gas of the volatilization rotary kiln;

[0017] The second purification device includes desulfurization equipment and denitrification equipment.

[0018] In one embodiment, the zinc-containing hazardous waste disposal system further includes a slag treatment device located downstream of the volatilization rotary kiln, the slag treatment device being used to receive and treat the slag from the volatilization rotary kiln.

[0019] In one embodiment, the slag treatment device includes a water quenching device and a collection device. The water quenching device is used to rinse the high-temperature molten slag discharged from the volatilization rotary kiln to form water-quenched slag, and the collection device is used to collect the water-quenched slag in the water quenching device.

[0020] In one embodiment, the product collection device includes a collection bag;

[0021] The product collection device includes a temporary storage room located downstream of the collection bag, a conveying device located between the collection bag and the temporary storage room, and packaging equipment, metering equipment, and storage room located downstream of the temporary storage room.

[0022] In one embodiment, the batching device includes multiple silos, metering elements corresponding to the multiple silos, and a feeding device. The multiple silos are used to receive various raw materials, the metering elements are used to quantitatively meter and feed the materials according to the batching process, and the feeding device receives the raw materials metered by each metering element and transports them to the volatilization rotary kiln.

[0023] In one embodiment, the feeding device includes a mixing device, a metering device, a transfer device, and a conveying device arranged sequentially. The mixing device is used to mix the zinc-containing waste material evenly. The transfer device is used to transfer the evenly mixed zinc-containing waste material to the metering device. The metering device is used to meter the zinc-containing waste material entering the conveying device. The conveying device is used to transport the metered zinc-containing waste material to the incineration rotary kiln.

[0024] As can be seen from the above technical solution, the advantages and positive effects of this utility model are as follows:

[0025] This invention relates to a zinc-containing hazardous waste disposal system. The system utilizes an incineration rotary kiln to treat various zinc-containing organic wastes and enrich valuable metals, while a volatilization rotary kiln can treat various zinc-containing inorganic wastes. The synergistic effect of the two rotary kilns enhances the system's adaptability to different raw materials, significantly expanding the types and sources of hazardous waste materials.

[0026] This zinc-containing hazardous waste disposal system, through the synergistic effect of two rotary kilns, transforms metallic zinc resources into widely used zinc oxide products, and other materials into slag that can be used as raw materials in the building materials industry. The system achieves significant results in both harmlessness and resource recovery. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of one embodiment of the zinc-containing hazardous waste disposal system of this utility model.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Rotary kiln for incineration; 2. Feeding device; 3. Blending device; 4. Rotary kiln for volatilization; 5. Product collection device; 6. First waste heat recovery device; 7. First purification device; 8. Collection and conveying device; 9. Second waste heat recovery device; 10. Second purification device; 11. Slag treatment device. Detailed Implementation

[0030] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0031] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0032] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0033] Therefore, this utility model provides a zinc-containing hazardous waste disposal system that can simultaneously treat organic hazardous waste and comprehensively recover valuable metals.

[0034] This zinc-containing hazardous waste disposal system is suitable for incinerating organic waste and enriching it with metallic zinc, as well as for refining zinc-containing waste to produce metal products suitable for industrial applications. The slag after high-temperature melting can be used in the building materials industry, effectively achieving resource utilization and harmless treatment of hazardous waste.

[0035] Figure 1 A schematic diagram of one embodiment of a zinc-containing hazardous waste disposal system is shown. (See attached diagram.) Figure 1 The zinc-containing hazardous waste disposal system includes an incineration rotary kiln 1, a feeding device 2, a blending device 3, a volatilization rotary kiln 4, and a product collection device 5.

[0036] Rotary kiln 1 is used for incinerating zinc-containing waste materials. The incineration of zinc-containing waste materials produces flue gas and solid kiln slag.

[0037] Specifically, in the rotary kiln 1, the main function is the incineration of organic matter. Various organic materials are incinerated and decomposed at high temperatures in the rotary kiln 1 to form gaseous oxides and solid kiln slag.

[0038] The zinc-containing waste raw materials, which contain organic matter, are mainly zinc-containing paint sludge / mud. Under the high-temperature conditions inside the rotary kiln 1, the organic matter is oxidized and decomposed into gaseous oxides (including oxides of water, carbon, sulfur, nitrogen, and other elements).

[0039] After the inorganic substances in zinc-containing waste materials are decomposed and oxidized, they remain in the kiln slag because they are not easily volatilized. The kiln slag can be further recycled to enrich valuable metals.

[0040] In the rotary kiln 1 for incineration, no other auxiliary materials are generally added. The main process involves the reaction of zinc-containing waste materials with air at high temperatures.

[0041] The rotary kiln 1 for incineration includes an inlet, a flue gas outlet, and a slag outlet.

[0042] The feeding device 2 is used to feed zinc-containing waste materials into the rotary kiln 1 for incineration. The feeding device 2 is located upstream of the rotary kiln 1. Specifically, the feeding device 2 is connected to the inlet of the rotary kiln 1.

[0043] Specifically, the feeding device 2 includes a mixing device, a metering device, and a conveying device arranged sequentially. The mixing device is used to mix the zinc-containing waste material evenly. The metering device is used to meter the zinc-containing waste material entering the conveying device. The conveying device is used to transport the metered zinc-containing waste material to the rotary kiln 1 for incineration.

[0044] In this embodiment, an unpacking device is also provided upstream of the mixing equipment, which is used to unpack the packaging bags containing zinc-containing waste raw materials according to the production schedule.

[0045] Mixing equipment is used to mix various wastes that have been unpacked evenly.

[0046] The transfer device is used to transfer the homogenized zinc-containing waste material to the metering device. In this embodiment, the transfer device uses a shovel to achieve the transfer.

[0047] The metering equipment includes a hopper and a metering element located at the outlet of the hopper. The hopper is used to receive the raw materials after they have been uniformly mixed by the mixing equipment. In this embodiment, the metering element is an electronic belt scale.

[0048] The conveying equipment is a belt conveyor, which is located between the electronic belt scale and the inlet of the rotary kiln 1 to transport zinc-containing waste materials to the rotary kiln 1.

[0049] The zinc-containing hazardous waste disposal system also includes a first waste heat recovery device 6. The first waste heat recovery device 6 is connected to the flue gas outlet of the rotary kiln 1 to receive the flue gas and recover and utilize the heat from it. The flue gas in the rotary kiln 1 has high thermal energy; the first waste heat recovery device 6 recovers the heat energy from the flue gas to produce steam, which is then used for power generation or other reuse methods. In this embodiment, the first waste heat recovery device 6 is a waste heat boiler.

[0050] The zinc-containing hazardous waste disposal system also includes a first purification unit 7 located downstream of the first waste heat recovery unit 6. The first purification unit 7 is used for removing dust, desulfurization, and denitrification. That is, the cooled flue gas is purified by the first purification unit 7 to meet emission standards before being discharged.

[0051] The mixing device 3 is located downstream of the rotary kiln 1 and is used to receive kiln slag and to prepare and mix materials in a quantitative manner to obtain a mixture.

[0052] Specifically, the batching device 3 includes multiple silos, metering elements corresponding to the multiple silos, and feeding equipment. The multiple silos are used to receive various raw materials, the metering elements are used to quantitatively meter and feed the materials according to the batching process, and the feeding equipment receives the raw materials metered by each metering element and transports them to the volatilization rotary kiln 4.

[0053] The various raw materials received by the silos refer to inorganic zinc-containing waste materials, reducing agents, fluxes, and kiln slag from the rotary kiln 1, which are placed in their respective silos. The reducing agent can be coal or coke. The flux can be a slagging agent.

[0054] Inorganic zinc-containing waste materials mainly include rotary kiln slag, steel plant flue dust, zinc slag, zinc ash, zinc mud from smelters, and low-grade zinc oxide ore.

[0055] Each metering device is located at the outlet of its corresponding hopper. After being measured by the metering device, a fixed amount of raw material is dispensed to the feeding equipment.

[0056] The feeding equipment uses a belt conveyor to transport the raw materials to the volatile rotary kiln 4.

[0057] The zinc-containing hazardous waste disposal system also includes a collection and conveying device 8. The collection and conveying device 8 is located between the incineration rotary kiln 1 and the blending device 3, and is used to collect the kiln slag produced by the incineration unit and convey the kiln slag to the blending device 3.

[0058] Specifically, the collection and conveying device 8 includes collection equipment, a storage bin, and conveying equipment. The collection equipment is used to collect the slag from the rotary kiln 1 into the storage bin. The storage bin is used to store the slag. The conveying equipment is used to convey the slag in the storage bin to the blending device 3.

[0059] The volatile rotary kiln 4 is located downstream of the mixing device 3 and is used to receive the mixture and react it to obtain volatile metallic zinc.

[0060] The mixture undergoes drying, dehydration, and decomposition (inorganic salts decompose into oxides) processes within the volatilization rotary kiln 4, and is ultimately reduced by a reducing agent to volatile metallic zinc. The metallic zinc is in a gaseous state and is discharged from the volatilization rotary kiln 4 along with the flue gas.

[0061] Other metal oxides that are not easily reduced (mainly iron oxide, silicon dioxide, magnesium oxide, aluminum oxide, and calcium oxide) are calcined and melted into glassy slag under high temperature conditions.

[0062] The reducing agent is generally coal and coke (mainly carbon, content above 60%), used to maintain the reducing atmosphere in the rotary kiln 4, so that zinc oxide is reduced to metallic zinc by carbon and carbon monoxide. The flux is generally lime, mainly calcium oxide (more than 50%), used as a slag-forming agent to supplement the insufficient calcium oxide in the slag, and finally produce glassy slag that meets the slag type requirements.

[0063] Product collection device 5 is located downstream of the volatilization rotary kiln 4 to receive gaseous metallic zinc and convert it into solid zinc oxide.

[0064] Product collection device 5 includes a collection bag. Gaseous metallic zinc discharged from the rotary kiln 4 is oxidized by oxygen in the air into solid zinc oxide powder, which is then collected by the collection bag.

[0065] Product collection device 5 includes a temporary storage room located downstream of the collection bag, a conveying device located between the collection bag and the temporary storage room, and packaging equipment, metering equipment, and storage room located downstream of the temporary storage room.

[0066] Conveying equipment transports zinc oxide to a temporary storage warehouse using a closed system. Packaging equipment bags the zinc oxide from the temporary storage warehouse. Measuring equipment weighs the bagged zinc oxide. The storage warehouse stores the packaged zinc oxide.

[0067] The zinc-containing hazardous waste disposal system also includes a slag treatment device 11 located downstream of the volatilization rotary kiln 4. The slag treatment device 11 is used to receive and treat the slag from the volatilization rotary kiln 4. That is, gaseous substances in the volatilization rotary kiln 4 enter the product collection device 5, and solid substances in the volatilization rotary kiln 4 enter the slag treatment device 11.

[0068] Specifically, the slag treatment device 11 includes a water quenching device and a collection device. The water quenching device is used to wash the high-temperature molten slag discharged from the volatilization rotary kiln 4 to form water-quenched slag. The water-quenched slag is mainly composed of compounds of iron oxides, silicon oxides, and calcium oxides, and can be used as a raw material in the building materials industry (cement plants, brick factories).

[0069] The collection device is used to collect the water-quenched slag inside the water-quenching equipment. In this embodiment, the equipment slag in the water-quenching equipment is grabbed by a grab bucket and placed into a dedicated warehouse.

[0070] Furthermore, the zinc-containing hazardous waste disposal system also includes a second waste heat recovery device 9. The second waste heat recovery device 9 is connected to the outlet of the volatilization rotary kiln 4 to receive the gas from the volatilization rotary kiln 4 and recover and utilize the heat. It is necessary that the gas output from the volatilization rotary kiln 4 includes gaseous metallic zinc. That is, the second waste heat recovery device 9 recovers the heat energy of the metallic zinc and other gases to produce steam, which is then used for power generation or other reuse methods.

[0071] The zinc-containing hazardous waste disposal system also includes a second purification device 10 located downstream of the volatilization rotary kiln 4. The second purification device 10 is connected to the outlet of the volatilization rotary kiln 4 to purify the flue gas from the kiln. The second purification device 10 includes desulfurization and denitrification equipment. The second purification device 10 is used to purify the gas output from the volatilization rotary kiln 4 to ensure it meets emission standards.

[0072] In this embodiment, the second purification device 10 is located downstream of the second waste heat recovery device 9. Of course, when the second waste heat recovery device 9 is not installed, the second purification device 10 can be directly connected to the gas outlet of the volatilization rotary kiln 4.

[0073] The zinc-containing hazardous waste disposal system in this embodiment has the following advantages:

[0074] 1. Rotary kiln 1 can treat various zinc-containing organic wastes and enrich valuable metals, while rotary kiln 4 can treat various zinc-containing inorganic wastes. Through the synergistic effect of the two rotary kilns, the entire system has greater adaptability to raw materials, greatly expanding the types and sources of hazardous waste raw materials.

[0075] This zinc-containing hazardous waste disposal system is beneficial to the normal operation of enterprises and deserves to be widely promoted.

[0076] 2. The slag from a single rotary kiln 1 is still waste and must be further processed by a volatilization rotary kiln 4 to obtain the final product, zinc oxide. In this embodiment, the zinc-containing hazardous waste disposal system, through the synergistic effect of two rotary kilns, transforms metallic zinc resources into the widely used zinc oxide product, and other materials into slag that can be used as raw materials in the building materials industry. The harmlessness and resource utilization effects are significant, greatly enhancing the economic benefits for enterprises.

[0077] 3. The rotary kiln 1 generates a large amount of heat energy when burning organic matter, and this heat energy is fully utilized to achieve energy saving. The flue gas is then purified by the first purification device 7 before being discharged, achieving emission reduction.

[0078] The rotary kiln 4 generates a large amount of heat, and this heat energy is fully utilized to achieve energy saving. The gas is then purified by the second purification device 10 before being discharged, achieving emission reduction.

[0079] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A zinc-containing hazardous waste disposal system, characterized in that, include: A rotary kiln for incinerating zinc-containing waste materials; the zinc-containing waste materials produce flue gas and solid kiln slag after incineration. A feeding device is used to feed the zinc-containing waste material into the incineration rotary kiln; A mixing device, located downstream of the rotary kiln, is used to receive the kiln slag and to quantitatively prepare and mix the materials to obtain a mixture. A volatile rotary kiln, located downstream of the mixing device, is used to receive the mixture and react it to extract volatile metallic zinc. A product collection device is located downstream of the volatilization rotary kiln to receive gaseous metallic zinc and convert it into solid zinc oxide.

2. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The zinc-containing hazardous waste disposal system also includes a collection and conveying device, which is located between the incineration rotary kiln and the blending device, for collecting the kiln slag produced by the incineration rotary kiln and conveying the kiln slag to the blending device; The collection and conveying device includes a collection device, a storage tank, and a conveying device. The collection device is used to collect the kiln slag from the rotary kiln into the storage tank, the storage tank is used to store the kiln slag, and the conveying device is used to convey the kiln slag in the storage tank to the blending device.

3. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The zinc-containing hazardous waste disposal system also includes a first waste heat recovery device, which is connected to the flue gas outlet of the incineration rotary kiln to receive the flue gas and recover the heat from the flue gas. The zinc-containing hazardous waste disposal system also includes a first purification device located downstream of the first waste heat recovery device, which is used for removing smoke and dust, desulfurization, and denitrification.

4. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The zinc-containing hazardous waste disposal system also includes a second waste heat recovery device, which is connected to the gas outlet of the volatilization rotary kiln to receive the gas from the volatilization rotary kiln and recover and utilize the heat.

5. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The zinc-containing hazardous waste disposal system also includes a second purification device located downstream of the volatilization rotary kiln. The second purification device is connected to the gas outlet of the volatilization rotary kiln to purify the flue gas of the volatilization rotary kiln. The second purification device includes desulfurization equipment and denitrification equipment.

6. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The zinc-containing hazardous waste disposal system also includes a slag treatment device located downstream of the volatilization rotary kiln, which is used to receive and process the slag from the volatilization rotary kiln.

7. The zinc-containing hazardous waste disposal system according to claim 6, characterized in that, The slag treatment device includes a water quenching device and a collection device. The water quenching device is used to rinse the high-temperature molten slag discharged from the volatilization rotary kiln to form water-quenched slag. The collection device is used to collect the water-quenched slag in the water quenching device.

8. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The product collection device includes a collection cloth bag; The product collection device includes a temporary storage room located downstream of the collection bag, a conveying device located between the collection bag and the temporary storage room, and packaging equipment, metering equipment, and storage room located downstream of the temporary storage room.

9. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The batching device includes multiple silos, metering elements corresponding to the multiple silos, and feeding equipment. The multiple silos are used to receive various raw materials. The metering elements are used to quantitatively meter and feed the materials according to the batching process. The feeding equipment receives the raw materials metered by each metering element and transports them to the volatilization rotary kiln.

10. The zinc-containing hazardous waste disposal system according to claim 1, characterized in that, The feeding device includes a mixing device, a metering device, a transfer device, and a conveying device arranged in sequence. The mixing device is used to mix the zinc-containing waste raw material evenly. The transfer device is used to transfer the evenly mixed zinc-containing waste raw material to the metering device. The metering device is used to meter the zinc-containing waste raw material entering the conveying device. The conveying device is used to transport the metered zinc-containing waste raw material to the incineration rotary kiln.

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