WO2010057444A1

WO2010057444A1 - Sealed dissociation and desulfurization reactor and system thereof

Info

Publication number: WO2010057444A1
Application number: PCT/CN2009/075085
Authority: WO
Inventors: 刘志强; 梁礼祥
Original assignee: 东莞市松山科技集团有限公司
Priority date: 2008-11-21
Filing date: 2009-11-23
Publication date: 2010-05-27
Also published as: CN101429595A; CN101429595B

Abstract

A sealed dissociation and desulfurization reactor comprises a desulfurization reaction tank body, a stirring mechanism, a feed inlet (1), a discharge outlet and a heating apparatus, wherein the stirring mechanism comprises a stirring transmission mechanism and a stirrer. The desulfurization reaction tank body is a horizontal rotary drum device. The reactor can enhance the desulfurization effect and reduce costs.

Description

Closed dissociation desulfurization reactor and system thereof

The present invention relates to a dissociation reactor and system therefor, and in particular to a closed dissociation reactor and system therefor. Background technique

Among the existing lead-acid recovery technologies for lead-acid batteries, there are all-wet electrolytic reduction technology, fire reduction technology and wet-fire combination technology, and desulfurization is an important link in lead-acid recovery technology for all waste I-day lead-acid batteries. . The desulfurization method includes a pre-desulfurization method and a simultaneous desulfurization method.

At present, more than 90% of lead-acid batteries in lead recycling are synchronous desulfurization reduction methods. Such as fire reverberation furnace (grid lead and lead paste) direct mixing smelting desulfurization, reduction: wet solid phase electrolysis direct chemical displacement desulfurization, reduction and so on. The mixing and smelting of the reverberatory furnace (grid lead and lead paste) requires the addition of a large amount of iron filings, reducing coal for desulfurization and reduction, and the reducing agent and sulfur and oxygen in the raw materials become waste residues; solid phase electrolytic reduction, because no pre-desulfurization is performed, In the subsequent electrolytic reduction process, the sulfur in the waste consumes NaOH to form NaS0 ₄ , which affects the concentration of the electrolyte, resulting in large power consumption and reduced electrolysis efficiency, resulting in regular desodium salt operation during electrolysis, and at the same time To add NaOH, it will greatly increase the cost.

The pre-desulfurization method is an advanced process. The process first separates the sulfur in the raw material by displacement or thermal decomposition to recover by-products, and then forms lead oxide for reduction, which greatly improves the environmental protection effect.

At present, the pretreatment technology mainly adopts the normal temperature chemical replacement method. The process uses a ₂ C0 ₃ or NaOH to replace the sulfur in the raw material into a Na ₂ S0 ₄ by-product, which requires a large amount of expensive displacer material and is replaced by a low-value by-product sodium sulfate. , high recycling cost, low value, small market utilization space, can not be recycled in battery production.

The patented invention is a thermal decomposition dissociation method for desulfurization, and the process is thermally decomposed by using a small amount of thermal energy without adding a displacer material, and the dissociated S0 ₃ is purified and absorbed by sulfuric acid (waste battery into a dilute acid) to absorb acid. The desulfurization cost is low, the recycling effect is good, and the produced sulfuric acid can be recycled to the battery production.

In the desulfurization step, the lead compound waste in the recovered lead-acid battery is desulfurized and deoxidized by a desulfurization device to become a PbO-based elemental lead compound, which is used for subsequent wet electrolytic reduction. Electrolytic lead.

The structure of the desulfurization reaction tank of the normal temperature chemical displacement method is as shown in FIG. 1 , which includes the actuator 101 , the support plate 102 , the stirring shaft 103 , the tank body 104 , the stirring paddle 105 , and the inlet and outlet ports , etc . Structure, The agitator shaft is placed vertically on the central axis of the tank body, and the material is contained in the tank body 104. The transmission 101 is supported on the support plate 102, and the agitator shaft 103 is rotated by the actuator 101 to drive the lower end of the agitator shaft 103. The stirring paddle 105 rotates and stirs the material, so that the material in the tank undergoes a chemical displacement reaction at a normal temperature, thereby achieving the purpose of desulfurization.

The structure of the reverberatory furnace of the high-temperature iron filing desulfurization method is as shown in FIG. 2, which includes a combustion chamber 201, a feed port 202, a slag outlet 203, an outlet lead 204, a refractory brick insulation layer 205, and a lead liquid 206, wherein The combustion chamber is also provided with a tail gas discharge port, and the lead paste material is subjected to high temperature desulfurization in the combustion chamber to achieve the purpose of desulfurization.

Both of the above devices have the disadvantages of using a large amount of expensive displacer materials to make the desulfurization cost high and the production efficiency low: (1) The pre-desulfurization technology consumes sodium carbonate or sodium hydroxide and is replaced by by-product sodium sulfate, and the recovery cost is high. The value is low and the market utilization space is small; (2) The high-temperature iron filings desulfurization reverberatory furnace desulfurization method consumes a large amount of iron scraps and other raw materials to produce slag which is solid hazardous waste and sulfur dioxide gas that cannot be replaced, causing serious environmental pollution. And waste of resources; the sulfur in the lead paste and the dilute acid brought in by the battery have not achieved the most efficient recycling. Summary of the invention

The object of the present invention is to provide a closed desulfurization dissociation reactor and a system thereof. The closed desulfurization dissociation reactor is prepared according to the principle of thermal decomposition desulfurization of lead paste, which not only improves the desulfurization effect of the lead paste, but also facilitates the subsequent electrolysis process. The quality is stable, and the desulfurization cost can be greatly reduced, and the production efficiency can be improved.

The above object of the present invention is achieved by the following technical solutions: a closed desulfurization dissociation reactor comprising a desulfurization reaction tank body, a stirring mechanism, and inlet and outlet ports respectively located at both axial ends of the tank body, wherein, stirring The mechanism comprises a stirrer and a stirring transmission mechanism, and the discharge port comprises a main material outlet and a secondary material outlet, wherein: the reactor further comprises a heating device, the heating device comprises a heater and a temperature control system, and the desulfurization reaction The can body is a rotatable horizontal drum device, and is mainly composed of a horizontal drum, a drum supporting mechanism and a drum transmission mechanism, wherein the drum is mounted on the drum in a manner that its rotation axis is transverse In the supporting mechanism, the agitator is installed in the rotating cylinder in the direction of the rotation axis of the rotating drum, and the rotating drum and the agitator are respectively connected to the respective transmission mechanisms, and are driven by the respective transmission mechanisms, and the agitator is in the same The lead material in the drum is stirred by the transmission mechanism; the heating device is disposed at the periphery of the drum, and the wall of the drum is added Pastes for indirect heating of the drum, so that the thermal decomposition of the pastel desulfurization reduction; desulfurized pastel Ingredients outlet from the output, the output of the thermal decomposition byproducts output from the sub-feed outlet. The closed desulfurization dissociation reactor of the invention adopts the above-mentioned closed and external heating mode, and the lead paste material is subjected to the force of two objects in the process of running in the reactor, wherein the force of one object is the rotation of the drum during the rotation The tipping force of the lead paste, if the axis of rotation of the drum is slightly inclined downward from the feed port of the drum to the discharge port and the horizontal line, the rotation of the drum also has an axial conveying force to the material, so that the material is turned over. Simultaneously moving toward the discharge port; the force of the other object is that the agitator applies a stirring force to the material in the drum during the rotation process. For example, if the agitator has an axial flow structure, the material in the drum also has an axis. The conveying force moves the material along the axial direction of the drum, and under the joint action of the two objects, the lead paste material can continuously tumbling and moving in the drum, and even can be in a suspended moving state, thereby realizing The lead paste is evenly heated to avoid sticking, so as to facilitate the drying of the lead paste material, and to fully dissociate the dried lead paste, and to achieve high quality and high efficiency desulfurization.

The closed desulfurization dissociation reactor for desulfurization of the lead paste of the present invention is prepared according to the principle of thermal decomposition reduction and desulfurization of the lead paste, and the reaction equation of thermal decomposition reduction is as follows:

PbS0 ₄ → PbO + S0 ₃ [a]

Pb0 ₂ → PbO +0.5 0 ₂ [b] From the above equations [a] and [b], it can be seen that the lead paste material in the drum does not need to be added with any reducing materials such as NaOH or Fe scrap when the reaction temperature is reached. It can achieve the purpose of desulfurization and deoxidation, produce granular lead oxide, and also produce by-product S0 ₃ gas, and the S0 ₃ gas has a high concentration, which can react with sulfuric acid to form concentrated sulfuric acid, which can be recycled for lead-acid battery production. The raw material, therefore, the invention can realize the clean production of lead paste desulfurization without waste discharge and resource recycling.

The agitator described in the present invention can adopt a screw shaft structure, which can realize the agitation of the material and the conveying of the material; the structure of the agitating shaft and the stirring blade can also be adopted, and the agitating shaft is axially A plurality of stirring blades are arranged, so that the lead material is continuously turned over and stirred during the process from the feeding inlet of the drum to the discharging port.

The agitating blade adopts a stirring blade structure with a stirring function alone, or a stirring blade structure having both a stirring and feeding functions, such as an impeller structure, a frame-shaped blade structure, a shaftless paddle structure, etc.; Two-two combinations in the structure: the frame-shaped paddle impeller structure of the agitating blade, as described, that is, the blade of the impeller is a radially extending frame-shaped blade, each impeller having at least two frame-shaped blades, It is also possible to have three or four or five or six or more blades, the blades are evenly distributed along the circumference of the impeller, and the plurality of frame-shaped paddle impellers are sequentially installed along the axial direction (X direction) of the agitating shaft. An agitator is formed on the agitating shaft.

The present invention can also be improved as follows: The above-mentioned agitator using a frame-shaped paddle impeller is installed in the stirring thereof. The frame-shaped paddle impellers on the shaft are closely arranged, and the blades on the adjacent impellers are staggered with each other, that is, the blades on the adjacent impellers are sequentially staggered clockwise or counterclockwise on the circumferential surface of the agitating shaft. The angle a is distributed, and the stagger angle a is an acute angle. The staggered structure of the adjacent impeller blades can make the agitator not only use the spiral formed by the interleaved blades to transport the lead paste material during the rotation process, but also can make the impeller blades on the agitating shaft It will not touch the material at the wall of the drum at the same time, reduce the stirring resistance and vibration of the stirring shaft. All adjacent impeller blades generally adopt the same stagger angle, so as to ensure uniform material transportation, the stagger angle is generally preferably 5~ Within 30°.

The invention may be further improved as follows: a blade made of a material having a lower hardness than the blade body is disposed on the outer end edge of the impeller blade for sweeping between the blade and the inner wall of the drum The material is to prevent the material from sticking on the wall of the drum, and the blade preferably has a rotation gap δ of 1 to 2 mm between the inner wall of the drum. The blade is disposed on the outer edge of the blade as a lossy member of the blade, because the impeller sweeps the material on the wall of the drum through the blade, which is the portion of the impeller that is most subjected to friction, and is extremely wearable. When the scraper wears to a certain extent, it can be replaced, so that the impeller body can be used for a long time, avoiding the need to replace the entire impeller due to the wear of the blade end, which not only helps to improve the service life of the impeller, but also greatly reduces the impeller. Maintenance costs and equipment maintenance time.

The present invention can also be modified as follows: A reinforcing rib is provided between two adjacent blades on the impeller for reinforcing the rigidity of the frame-shaped blade and the rigidity of the entire impeller.

The invention can be further improved as follows: In order to meet the requirements of the process and production efficiency of the lead paste desulfurization reaction, the length of the drum is generally long, and can be as long as 2 to 5 meters. In this case, the agitating shaft is entirely The structure will have the problem of difficult processing and high maintenance cost, because when the agitator shaft is partially damaged, the whole shaft will be scrapped, which not only wastes materials, but also keeps the maintenance cost high, and the maintenance work takes time and effort. It is not conducive to returning to normal production as soon as possible. To this end, the agitator shaft of the present invention can adopt a split shaft structure, the agitating shaft is composed of a plurality of unit shafts and a coupling member, and each adjacent two unit shafts are connected by a coupling member to form a whole. The agitator shaft of the drum not only makes the agitator shaft easy to process and cost, but also makes maintenance easier and convenient, and the maintenance cost and time are significantly reduced.

The invention ensures that the split stirring shaft has good rigidity and has high stability when rotating, and a supporting flange is arranged corresponding to the connecting shaft on the stirring shaft, and the supporting flange outer periphery is installed at the same On the inner wall of the drum, the central hole is supported on the coupling member between each two unit shafts of the agitating shaft, and the number thereof is equal to the number of the connecting shafts.

The drum supporting mechanism of the present invention is composed of a pair of rotating drums respectively disposed at two ends of the outer portion of the rotating drum, Each of the drum supports is further composed of a roller and a support for supporting the roller, each pair of rollers supporting symmetrically supporting both sides of the drum, the axis of the roller being parallel to the axis of rotation of the drum, such that the drum The support mechanism not only supports the horizontal drum but also allows the drum to rotate on the support.

In order to improve the effect of material stirring and tumbling, the invention ensures that the material in the rotating drum is always in a suspended state, and the rotating drum and the agitator can be rotated in the opposite direction. The heater in the heating device of the present invention may be composed of a combustion medium and a heat medium therein and a heat medium inlet and outlet communicating with a heat source of the heat medium provided by the combustion chamber, the combustion chamber surrounding the outer circumference of the drum and Forming an annular closed-end pipe, the heat medium flows through the heat medium inlet and outlet provided on the pipe wall and transfers heat to the drum wall. In order to save energy, an insulation layer made of heat insulating material can be arranged outside the combustion chamber to provide heat insulation and heat radiation. The optimum temperature range for desulfurization is in the range of 800 to 820 ° C, so the heat medium is combustion heat.

Further improvement measures of the present invention: In order to further improve the desulfurization effect of the lead paste, the lead paste material entering the closed desulfurization dissociation reactor may be dried first, that is, the present invention also provides a desulfurization dissociation reaction system, and the system further The invention comprises a drying device and the closed desulfurization dissociation reactor, wherein a discharge port of the drying device is connected to a feed port of the desulfurization dissociation reactor, and the lead paste material is first sent to a drying device for drying, and then enters desulfurization. dissociation desulfurization reactor, PbO and outputs S0 ₃ gas. The drying device may employ a drying device of the prior art or an improved drying device.

The improved drying device according to the present invention is based on a horizontal agitating and drying device, and uses the same annular duct type heat medium heater as the desulfurization dissociation reactor to wrap the drying cylinder in the drying device, in order to utilize other The waste heat generated in the production process provides conditions that can be implemented in order to achieve green production of energy saving and emission reduction. Compared with the prior art, the present invention has the following significant advantages:

(1) The closed dissociation reactor of the invention is made according to the principle of thermal decomposition and reduction desulfurization of the lead paste, adopts a closed and external heating mode, and indirectly heats the material by means of the heat transfer of the drum, thereby avoiding local overheat formation caused by direct combustion heating. It is difficult to carry out the phenomenon of bonding and decomposition, and also avoids the phenomenon that the direct combustion and heating generate a large amount of combustion exhaust gas and cause environmental pollution, which not only helps to improve the desulfurization effect of the lead paste, but also greatly reduces the desulfurization cost, and is also beneficial to Environmental protection, achieving clean production of lead paste desulfurization without waste discharge and resource recycling.

(2) The sulfur trioxide produced in the closed desulfurization dissociation reactor of the present invention can be completely recycled and utilized as an acid-making raw material, and the concentration of the sulfur trioxide to be decomposed is maximized to reach the trioxane. Recycling of sulfur.

(3) The closed desulfurization dissociation reactor of the present invention, the lead paste material is subjected to the force of two objects during the operation of the reactor: one is the rotational force during the rotation of the drum, and the rotational force enables the material to be Turn up and down to prevent the material from accumulating at the bottom of the drum due to gravity, which causes the unevenness of the heat of the lead paste to be unevenly distributed and difficult to transport to form a dead corner. The second is the stirring force applied to the material during the rotation of the agitator. Or there is a simultaneous application of the conveying force, the lead paste material can be tumbling and moving in the drum under the action of the two objects, and even in a suspended moving state, such as using a rotating drum and stirring. The steering direction is reversed, and the suspension effect is better, so that the lead paste material can be uniformly heated to avoid bonding, which is convenient for drying the lead paste material, and can fully dissociate the dried lead paste to achieve the best effect of desulfurization and dissociation of the lead paste. And improve production efficiency.

(4) In the closed desulfurization dissociation reactor of the present invention, when the agitator is configured with a frame-shaped paddle impeller structure, the adjacent impeller blades are staggered and distributed, so that the agitator can be formed not only by the staggered blades during the rotation process. The spiral shape serves to transport the lead paste material, and the impeller on the stirring shaft can not simultaneously touch the lead paste material at the wall of the rotating drum, thereby reducing the stirring resistance and vibration of the stirring shaft.

(5) The present invention further provides a blade as a loss member at the outer end edge of the impeller blade, which can be replaced when it is worn to a certain extent, which is advantageous for ensuring long-term use of the impeller body and avoiding wear of the blade end. The need to replace the entire impeller occurs, which not only improves the service life of the impeller, but also greatly reduces the maintenance cost of the impeller and the maintenance time of the equipment.

(6) The heater and the drying device in the heating device according to the present invention may adopt a heating method of a combustion chamber and a heat medium, and perform the use of waste heat generated in other processes of the waste lead-acid battery lead recovery and recycling process. The heating of the desulfurization process provides conditions that are conducive to energy saving, comprehensive utilization of resources and cleaner production.

The closed desulfurization dissociation reaction system provided by the invention is composed of a drying device connected with a closed desulfurization dissociation reactor, the former is used for drying and dehydrating the lead paste material, and the latter is used for desulfurization, deoxidation, and first drying the lead paste material. Then, it enters the closed desulfurization dissociation reactor for desulfurization, and improves the desulfurization effect of the lead paste and its production efficiency and the concentration of the by-product S0 ₃ produced. DRAWINGS

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

1 is a schematic view showing the overall structure of a desulfurization reaction tank in the prior art; 2 is a schematic view showing the overall structure of a reflective furnace in the prior art;

Figure 3 is a schematic view showing the overall structure of the closed dissociation reactor of the present invention;

Figure 3A is an enlarged view of the direction A of Figure 3;

Figure 4 is a cross-sectional view taken along line B-B of Figure 3;

Figure 5 is a cross-sectional view taken along line C C of Figure 3;

Figure 6 is a partial schematic view showing the structure of the closed dissociation reactor of the present invention;

Figure 7 is a schematic perspective view showing the support flange of the closed dissociation reactor of the present invention;

Figure 8 is a schematic perspective view showing the structure of the dial of the closed dissociation reactor of the present invention;

9 is a partial structural view of the dial of the present invention, showing the positional relationship between the palm and the blade; FIG. 10 is another schematic structural view of the dial of the present invention;

Figure 11 is a schematic view showing still another structure of the dial of the present invention;

Figure 12 is a schematic view showing still another structure of the dial of the present invention;

Figure 13 is a schematic view showing still another structure of the dial of the present invention;

Figure 14 is a schematic view showing still another structure of the stirring shaft of the present invention;

Fig. 15 is a view showing the entire structure of the dissociation reaction system of the present invention, omitting the supporting mechanism of the drying device and the dissociation reactor. detailed description

A closed dissociation reactor as shown in FIG. 3 to FIG. 9 , comprising a desulfurization reaction tank body, a stirring mechanism, and a feed port 1 and a discharge port respectively located at both axial ends of the tank body, wherein the stirring mechanism The utility model comprises a stirrer and a stirring transmission mechanism, wherein the discharge port comprises a main material outlet 6 and a auxiliary material outlet 14, the dissociation reactor further comprises a heating device, the heating device comprises a heater 9 and a temperature control system, and the desulfurization reaction tank body is rotatable The horizontal drum device is mainly composed of a horizontal drum 4, a drum supporting mechanism and a drum transmission mechanism, wherein the drum 4 is mounted on the drum supporting mechanism in a manner that the rotation axis thereof is transverse, and the agitator rotates The rotation axis direction of the cylinder 4 is installed in the rotating drum, and the rotating drum 4 and the agitator are respectively connected with the respective transmission mechanisms, and are driven by the respective transmission mechanisms, and the agitator drives the lead in the rotating cylinder 4 under the driving mechanism thereof. The paste material is stirred; the heating device is disposed on the periphery of the drum, and the lead paste in the drum is heated indirectly by heating the wall of the drum to thermally decompose the lead paste. Sulfur.

The heater 9 is composed of a heat medium and an outlet 2a, 2b communicating with a heat medium in the combustion chamber and a heat medium provided by the combustion chamber, and an insulation layer 10 made of a heat insulating material is disposed outside the combustion chamber to burn The chamber is a pipe that surrounds the outer periphery of the drum and forms an annular closed end. The heat medium flows through the heat medium inlet and outlet 2a, 2 disposed on the pipe wall and transfers heat to the drum. The wall and the heat insulating layer 10 have a heat insulating effect, and during operation, the desulfurization temperature in the heater 9 is ensured to be in the range of 800 to 820 °C.

The drum 4 is located in the heater 9, and both ends of the drum 4 are tapered outlets, feed cones, the feed port 1 is connected to the feed cone, the other end of the feed port 1 and the screw feeding device 16 Connected, the side wall of the discharge cone is provided with a drain hole 4a through which the dissociated lead paste is leaked into the main material outlet 6, and the stirring shaft conveys the lead material into the closed dissociation reactor. Desulfurization dissociation is carried out, and the lead paste after desulfurization is produced from the main material outlet 6, and by-products such as sulfur trioxide and water vapor which are thermally decomposed are produced from the auxiliary material outlet 14.

The agitator of the present invention adopts a combination of agitating shaft 3 and agitating blade 5, and a plurality of agitating blades 5 are disposed on the agitating shaft 3 in the axial direction, and the agitating shaft 3 is mounted on the rotating drum 4 in the direction of the rotation axis of the rotating cylinder 4. The center, which is a split shaft structure, is composed of a plurality of unit shafts 3b and a plurality of coupling members 3a, and each adjacent two unit shafts 3b is connected by a coupling member 3a to form a longitudinal entire drum 4. The stirring shaft 3 and the stirring shaft 3 are supported on the stirring shaft supporting mechanism, and the rotating drum 4 and the stirring shaft 3 are respectively connected with the respective transmission mechanisms, and are rotated in the reverse direction by the respective transmission mechanisms, so that the lead material is in the rotating drum 4 It is constantly flipped and stirred, and it is always in a semi-suspended state.

The agitating shaft supporting mechanism is composed of a stirring shaft supporting bearing 11 and a supporting flange 8. The agitating shaft supporting bearing 11 supports both end ends of the agitating shaft 3, and the outer periphery of the supporting flange 8 is mounted on the inner wall of the rotating drum 4, and the central hole thereof Supporting the coupling member 3a between each two unit shafts of the agitating shaft, the number of which is equal to the number of the coupling members 3a, the agitating shaft transmission mechanism is driven by the agitating shaft drive sprocket 12 and the agitating shaft drive motor (not shown) The stirring shaft is connected to the stirring shaft drive sprocket 12, and the stirring shaft driving sprocket 12 is connected with the stirring shaft transmission motor, and is driven by the stirring shaft transmission motor. In the present invention, the transmission mechanism of the stirring shaft is also the transmission mechanism of the agitator. .

The stirring blade 5 is set on the stirring shaft 3, and the stirring blade 5 is stirred and conveyed by the stirring shaft 3 to the lead material in the rotating drum 4, and 24 stirring blades 5 are arranged along the axial direction of the stirring shaft 3 (X A series of strings on the stirring shaft 3, adjacent stirring blades 5 are in close contact, and adjacent stirring blades of the 24 stirring blades 5 are staggered.

The agitating blade 5 of the present invention has a frame-shaped paddle impeller structure, that is, the blade of the impeller is a radially extending frame-shaped blade, and each piece of the stirring blade 5 is composed of a bushing 5a, three blades 5b and three The rib 5c is composed, and the three blades 5b are uniformly distributed on the sleeve 5a, that is, the angle between the adjacent blades 5b is equal to 120°, and each blade 5b is fixedly mounted on the sleeve 5a. Above, the blades on the adjacent impellers are staggered with each other, that is, the blades on the adjacent impellers have a shift angle of 20° in the counterclockwise direction on the circumferential surface of the stirring shaft, and the stagger angle α The stirring blade does not simultaneously hit the lead paste material at the bottom of the drum 4, and the stirring resistance of the stirring shaft 3 is reduced. Each of the blades 5b is spaced apart from the outer end surface adjacent to the inner wall of the drum 4 with three blades 5d. The hardness of the blade 5d is lower than the hardness of the blade body, and the blade 5d has 10 with respect to the axis of the blade 5b. The inclination angle β of °, and the blade 5d and the inner wall of the drum 4 have a rotation gap δ of 2 mm. The blade 5d has an inclined angle β with the axis of the blade 5b, and functions as a screw thrust to promote the movement of the material, so that the lead paste material at the bottom of the drum 4 is scraped at every point.

The drum support mechanism is composed of a pair of drum support bearings 7 disposed at two ends of the drum 4, each drum support 7 is composed of a roller and a support roller support, and each pair of drum supports 7 symmetrically supported two of the drums Side, the axis of the roller is parallel to the axis of rotation of the drum, the drum 4 is supported on the drum support bearing 7, and the drum transmission mechanism is composed of a drum drive sprocket 13 and a drum drive motor (not shown) The drum 4 is connected to the drum drive sprocket 13 and the drum drive sprocket 13 is connected to the drum drive motor and driven by the drum drive motor.

In the dissociation reactor of the invention, the heater is fixed during the working process, and the rotating drum is rotated by the rotating mechanism of the rotating drum to uniformly heat the material in the rotating drum, and at the same time, the stirring shaft is driven by the stirring shaft transmission mechanism. Reverse rotation with the drum, so that the material in the drum is kept stirring in the drum, and is in a semi-suspended state to realize the desulfurization dissociation of the lead paste.

Among them, the agitating blade in the present invention can also adopt the structure shown in Fig. 10, that is, the agitating blade 5 is composed of only one bushing 5a and three paddles 5b, and no reinforcing rib is used.

The stirring blade 5 can also adopt the structure of two blades (refer to Fig. 11) and four blades (refer to Fig. 12), or five, six, and the like, which are divided into a plurality of blades, when four blades are used. In the case of construction, it is also possible to add reinforcing ribs between the blades (see Fig. 13) to make the structure stronger.

In addition to the frame-shaped paddles, the paddles in the agitating blades of the present invention may also be plate-shaped blades, i.e., the blades are plate-shaped, or a lattice-shaped blade is used.

The agitating shaft in the present invention can also adopt the shaft structure as shown in FIG. 14, that is, the agitating shaft 3' adopts an integral shaft structure, the stirring blade 5' adopts a streamlined spiral structure, and the agitating blade 5' is fixedly mounted on the agitating shaft 3'. on.

The dissociation reactor of the present invention can be combined with a drying device to form a desulfurization dissociation reaction system. As shown in Fig. 15, the feed port of the drying device 15 is connected to the screw feed device 16, and the discharge port and the feed of the desulfurization dissociation reactor are fed. The mouth is connected, and the upper portion further has a water vapor discharge port 15a. The lead paste material is first sent to a drying device for drying, and the water vapor is discharged from the water vapor discharge port 15a, and the dried lead paste is then sent to a desulfurization dissociation reactor for desulfurization and dissociation reaction. Produce PbO and S0 ₃ gases.

The drying device 15 of the present invention is based on the horizontal stirring and drying device, and is desulfurized and dissociated with the present invention. The same annular ducted heat medium heater in the reactor wraps the drying cylinder in the drying unit to provide implementable conditions for utilizing the waste heat generated by other production processes in order to achieve green production of energy saving and emission reduction.

The drying device and the dissociation reactor are independent, and the waste heat of the exhaust gas of the high-temperature dissociation reactor is used to enter the lower-temperature drying device for dehydration, thereby achieving the energy-saving effect of waste heat utilization.

The above drying device can also adopt a general drying device, or directly use an oven to bake the lead material to achieve the purpose of dehydration. The dehydration step is a pretreatment step of desulfurization of the lead paste, and the dehydrated lead paste is sent to the dissociation reactor for desulfurization and deoxidation treatment.

In the invention, during the rotating process, the scraping material is actually scraped with the lead paste material on the inner wall of the rotating drum, and the scraping blade has a inclined angle with respect to the blade axis, which has a certain spiral on the movement of the material. The push of the thrust, the scrapers on the same blade are staggered and connected to each other to ensure that the lead paste material at the bottom of the drum can be scraped at every point.

The inclination angle β may be in the range of 10 to 30°, preferably 15 to 25°, and the rotation gap δ between the blade and the inner wall of the drum may not be too large or too small, the rotation gap is too large, and the blade is difficult to be used. The material scraped onto the wall of the drum causes the material on the wall of the cylinder to bond; the rotating gap is too small, and the scraper receives a large resistance when scraping the material on the wall of the cylinder, which easily damages the blade, and the rotation gap δ is relatively The range is between 1 and 2 mm.

Claims

Rights request

A closed desulfurization dissociation reactor, comprising a desulfurization reaction tank body, a stirring mechanism and inlet and outlet ports respectively located at two axial ends of the tank body, wherein the stirring mechanism comprises a stirrer and a stirrer transmission mechanism, The feed port includes a main material outlet and a secondary material outlet, wherein: the reactor further comprises a heating device, the heating device comprises a heater and a temperature control system, and the desulfurization reaction tank body is a rotatable horizontal rotation The cylinder device is composed of a horizontal drum, a drum supporting mechanism and a drum transmission mechanism, wherein the drum is mounted on the drum supporting mechanism with its rotation axis transverse, the agitator The rotating shaft direction of the rotating drum is installed in the rotating drum, and the rotating drum and the agitator are respectively connected with the respective transmission mechanisms, and are driven by the respective transmission mechanisms, and the agitator is driven by the transmission mechanism to the inside of the rotating cylinder. The paste material is agitated; the heating device is disposed at the periphery of the drum.

2. The closed desulfurization dissociation reactor according to claim 1, wherein: the agitator adopts a structure of a stirring shaft and a stirring blade, and a plurality of stirring blades are arranged on the stirring shaft in the axial direction. .

3. The closed desulfurization dissociation reactor according to claim 2, wherein: the agitating blade has a frame-shaped paddle impeller structure, that is, the blade of the impeller adopts a radially extending frame-shaped blade, Each impeller has at least two frame-shaped blades, the blades are evenly distributed along the circumference of the wheel axle of the impeller, and a plurality of frame-shaped paddle impellers are mounted on the agitating shaft along the axial direction of the agitating shaft (X-direction M clothing) Make up the mixer.

4. The closed desulfurization dissociation reactor according to claim 3, wherein: the frame-shaped paddle impellers mounted on the agitating shaft are closely arranged, and the blades on the adjacent impellers are staggered from each other, that is, The blades on the adjacent impellers are sequentially distributed in a clockwise or counterclockwise direction on the circumferential surface of the agitating shaft at an offset angle ct, which is an acute angle.

5. The closed desulfurization dissociation reactor according to claim 4, wherein: a blade is disposed on an outer end edge of the impeller blade, and the blade is between the inner wall of the drum It has a rotation gap of 1 to 2 mm.

6. The closed desulfurization dissociation reactor according to claim 5, wherein: ribs are disposed between two adjacent blades on the impeller for reinforcing the frame-shaped blades Rigidity and overall rigidity of the impeller.

7. The closed desulfurization dissociation reactor according to claim 1, wherein: the agitating shaft adopts a split shaft structure, and the agitating shaft is composed of a plurality of unit shafts and a coupling member, each adjacent two The unit shafts are connected by a coupling member to form a stirring shaft that runs through the entire drum.

8. The closed desulfurization dissociation reactor according to claim 7, wherein: a support flange is disposed at a coupling member corresponding to the agitating shaft, and the support flange is mounted on the outer periphery On the inner wall of the drum, the central hole is supported on the coupling member between each two unit shafts of the agitating shaft, and the number thereof is equal to the number of the connecting shafts.

9. The closed desulfurization dissociation reactor according to claim 1, wherein: the drum supporting mechanism is composed of a pair of rotating drums respectively disposed at two ends of the outer portion of the rotating drum, and each of the rotating drum supports It consists of a roller and a support for supporting the roller. Each pair of rollers supports symmetrically supporting both sides of the drum, and the axis of the roller is parallel to the rotation axis of the drum.

10. A closed desulfurization dissociation reactor according to claim 1 wherein: said drum and said agitator rotate in opposite directions.

11. A closed desulfurization dissociation reactor according to claim 1 wherein: said heater is heated by a heating chamber and a heat medium therein and a heat medium in communication with a heat source providing a heat medium in the heating chamber. And an outlet composition, the heating chamber is a pipe that surrounds the outer circumference of the drum and forms an annular closed end, and the heat medium flows through the pipe through the heat medium inlet and outlet provided on the pipe wall. Heat to the wall of the drum.

The sealed desulfurization dissociation reactor according to claim 11, wherein an insulating layer made of a heat insulating material is provided outside the heating chamber.

13. A desulfurization dissociation reaction system comprising a closed desulfurization dissociation reactor according to claim 1, wherein: the system further comprises a drying device, a discharge port of the drying device and the desulfurization dissociation reactor The feed ports are connected.