Ion exchange resin magnetic material sintering furnace

Abstract

The utility model discloses an ion exchange resin magnetic material sintering furnace which is used for carrying out oxygen introduction sintering on a precursor, carrying out heat preservation on a furnace chamber through an inner heat preservation ring and a heat preservation column core in the heating sintering process, determining a specific temperature stage through a CO detector, and adjusting the oxygen introduction amount by adjusting a gate plate air adjusting valve, and is convenient to operate and high in practicability. And the temperature control is not easy to deviate. The furnace is characterized by comprising a furnace body and a furnace door, the furnace door is detachably arranged on the furnace body, the furnace body sequentially comprises a furnace shell, a heat insulation layer, a heating module and a furnace cavity from outside to inside, a gap exists between the heat insulation layer and the furnace shell, an air heat insulation layer is formed, heat escape is reduced, and the heating module is close to the furnace cavity and wraps the furnace cavity. The furnace chamber is rotatably located in the heating module, blades are arranged in the furnace chamber, the blades scatter a precursor in the rotating process of the furnace chamber, and the furnace door comprises an inner heat preservation ring and a heat preservation column core which are used for blocking the furnace chamber and conducting heat preservation on the furnace chamber.

Description

Technical Field

[0001] The utility model discloses an ion exchange resin magnetic material sintering furnace, which relates to a key equipment capable of producing permanent magnetic materials and belongs to the technical field of water treatment. In particular, the utility model relates to a sintering furnace for oxygen-permeable sintering of a precursor, wherein during the heating and sintering process, a furnace cavity is insulated by an inner insulation ring and an insulation column core, a specific temperature stage is determined by a CO detector, and the oxygen flow rate is adjusted by adjusting a gate plate air regulating valve. The utility model has the advantages of easy operation and temperature control that is not prone to deviation. Background Art

[0002] In the process of high-speed water treatment using a suspended reaction layer, magnetic ion exchange resin plays an important role in reducing the contact time between water and resin and improving water treatment efficiency. Specifically, raw water enters the bottom of the high-speed reactor from the water inlet pipe through the diversion pipe. The water and resin in the reactor are stirred at a low speed by the stirrer. Due to the unique agglomeration ability of the magnetic resin, the resin can be quickly settled and separated. After the magnetic agglomeration force and the stirring action of the resin reach a balance, a stable suspended reaction layer is formed, allowing the water and resin to completely contact and react to complete the ion exchange. The magnetic ion exchange resin contains a permanent magnetic material - γ-iron oxide, which makes the magnetic ion exchange resin magnetic after being magnetized by the magnetizing equipment. The current preparation methods of γ-iron oxide include solid phase synthesis, sol-gel method, mechanical ball milling method and chemical co-precipitation. Co-precipitation method, etc., among which the co-precipitation method is a method of adding a precipitant to a metal salt solution to cause the cations in the solution to co-precipitate, thereby obtaining a composite oxide powder. The final product obtained by the existing co-precipitation method is doped with a large amount of ferroferric oxide. Ferroferric oxide is a paramagnetic material with a weak response to the magnetic field, a small magnetic susceptibility, and a weak magnetization effect. Once the external magnetic field is removed, the paramagnetic material cannot maintain its magnetism and cannot provide magnetic force for the agglomeration of the magnetic ion exchange resin. It is not suitable for high-speed water treatment processes of suspended reaction layers. In addition, in the process of preparing magnetic iron oxide powder, the existing co-precipitation method requires nitrogen protection during the precipitation reaction to obtain the precursor. In actual industrial production, the cost is high, the process is complex, and the operation is difficult, making it unsuitable for mass production of permanent magnetic materials.

[0003] The method for preparing magnetic ferroferric oxide by oxidation co-precipitation is disclosed in the publication CN117247052A. The method for preparing by oxidation co-precipitation uses divalent iron source as raw material and hydrogen peroxide as oxidizing agent to oxidize Fe2+ and make the molar ratio of Fe2+ to Fe3+ in the system be 1:2. Then, a precipitating agent is added to react under heating condition to obtain nano-sized ferroferric oxide particles. The hydrogen peroxide is mixed with ferrous ammonium sulfate solution, the pH value of the solution is adjusted by adding sulfuric acid, and then the solution is heated to the target temperature. The pH value of the solution is adjusted again by adding sodium hydroxide solution as precipitating agent. Under suitable pH conditions, Fe2+ and Fe3+ in the system will be precipitated at the same time. After standing and cooling for 10 minutes, ferroferric oxide nanoparticles with good magnetic response can be obtained. The preparation method of nano-ferroferric oxide is disclosed in the publication CN115676899A, which includes the following steps: mixing ferrous oxalate with aqueous solution of strong base to carry out solid-liquid reaction to obtain reaction liquid, the temperature of the solid-liquid reaction is 20-80℃; the obtained reaction liquid is aged to obtain nano-ferroferric oxide, the aging temperature is 20-80℃, and the aging time is 1-4h. The ferroferric oxide magnetic powder for water treatment and its preparation method are disclosed in the publication CN115159586A. The preparation method includes: preparing iron salt solution and precipitating agent solution, adding them into a reaction kettle for co-precipitation reaction; stirring to carry out magnetization reaction to obtain first slurry; grading the first slurry to obtain powder with particle size smaller than the grading particle size and second slurry containing magnetic particles; returning the powder as crystal seed template to the reaction kettle for growth; washing the second slurry, spray drying to obtain ferroferric oxide powder. The final product of the above-mentioned ferroferric oxide prepared by co-precipitation method is mainly ferroferric oxide, which is paramagnetic material with weak response to magnetic field, small magnetic susceptibility and weak magnetization. Once the external magnetic field is removed, the paramagnetic material cannot maintain its magnetism, cannot provide magnetic force for the agglomeration of magnetic ion exchange resin, and is not suitable for high-speed water treatment process of suspended reaction layer.

[0004] Publication No. CN116692953A discloses a kind of nano γ-Fe2O3 and its preparation method, ferrous oxalate and hydrogen peroxide aqueous solution are mixed to carry out oxidation reaction, the oxidation reaction liquid obtained after mixing with alkaline solution and aging is obtained The nano γ-Fe2O3;The alkaline solution includes alkali metal hydroxide, organic dispersant and water;Publication No. CN107572597A discloses a kind of preparation method of γ-Fe2O3 nano material, Fe (NO3) 3?9H2O is reacted with L-tartaric acid by water phase to obtain red-brown viscous liquid, red-brown viscous liquid is placed in air blast oven to dry to obtain gray-green solid powder, gray-green solid powder is placed in muffle furnace and is calcined to obtain γ-Fe2O3 nanoparticles;Applicant obtains γ-iron oxide by the above method, the final product is not easy to modify in the process of preparing magnetic ion exchange resin, and the final product obtained is insufficient in purity, contains more other oxides, such as magnetite, alpha iron oxide and other paramagnetic materials, not suitable for high-speed water treatment process of suspended reaction layer.

[0005] In order to improve the above problems, the applicant has filed another Chinese utility model patent application for the preparation method of a high-speed water treatment process ion exchange resin permanent magnetic material, which is entitled to a high-speed water treatment process ion exchange resin permanent magnetic material. The method is prepared by double decomposition reaction of carbonate solution and ferrous salt solution to obtain active ferrous carbonate, and then calcined to completely decompose the active ferrous carbonate into active magnetite. The active magnetite is oxidized at a suitable temperature, and Fe3O4 is converted into γ-Fe2O3. The final product has high purity, and the γ-iron oxide produced after calcination and oxidation is easy to modify in the process of preparing magnetic ion exchange resin, and is suitable for high-speed water treatment process of suspended reaction layer. In the preparation process, the active ferrous carbonate precursor is very sensitive to temperature, and the heating and calcination process is complex, and accurate temperature control is required at each stage to ensure the formation of target product. Ordinary rotary furnace cannot assist operators to determine the specific temperature stage, and the control operation of oxygen calcination process is complex, and the flexibility is insufficient. The calcination temperature and oxygen flow are easy to deviate, resulting in the final product containing magnetite and alpha iron oxide and other paramagnetic materials, and the phase purity of the final product is low.

[0006] Publication No. CN221301927U discloses a sealed energy-saving rotary furnace, which comprises a bottom plate, a furnace body is installed at the top end of the bottom plate, a feeding pipe is installed at one end of the furnace body, a discharging pipe is installed at the other end of the furnace body, an upper feeding pipe is installed above the feeding pipe, an upper feeding cavity is installed at the top end of the upper feeding pipe, an upper feeding opening is arranged above the upper feeding cavity, and a feeding mechanism is arranged inside the upper feeding cavity and the upper feeding pipe; Publication No. CN221301926U discloses an automatic rotary furnace for denitration combustion improver, which comprises a fixed support, a movable support and a furnace body, the movable support is rotatably connected to the fixed support at both sides of the front end of the movable support, the fixed support is provided with a first driving member for driving the movable support to overturn, the top of the movable support is provided with a first support plate at the front end and a second support plate at the rear end, the furnace body is rotatably installed between the first support plate and the second support plate, the movable support is provided with a second driving member for driving the furnace body to rotate, the front surface of the first support plate is rotatably provided with a cover plate for sealing the opening of the furnace body, and the first support plate is symmetrically provided with two groups of control assemblies for opening and closing the cover plate; Publication No. CN221288012U discloses a rotary furnace for deslagging agent, which comprises a material box, a feeding hopper and a rotary furnace body, two counter-rotating crushing rollers are arranged in the feeding box, an inclined screen is arranged at the lower end of the crushing roller, a conveying box is arranged on the side wall of the feeding box, and a spiral output rod is arranged in the conveying box; Publication No. CN118345345A discloses a gas phase deposition coating rotary furnace, which comprises a furnace pipe, a driving mechanism for driving the furnace pipe to rotate, a first gas inlet assembly, a second gas inlet assembly, an exhaust assembly, a vacuum pumping assembly, a first rotary joint and a second rotary joint, the first gas inlet assembly and the second gas inlet assembly are in communication with the inside of the furnace pipe through the first rotary joint and the furnace pipe, and the exhaust assembly and the vacuum pumping assembly are in communication with the inside of the furnace pipe through the second rotary joint and the furnace pipe. The above rotary furnace cannot assist the operator to determine the specific temperature stage, and the control operation of the oxygen combustion process is complex, the flexibility is insufficient, the calcination temperature and the oxygen amount are prone to deviation, and the final product contains paramagnetic materials such as ferroferric oxide and alpha ferric oxide, so that the phase purity of the final product is low. Practical new type content

[0007] In order to improve the above situation, the ion exchange resin magnetic material sintering furnace provides a sintering furnace for oxygen sintering of the precursor, the furnace cavity is heat-insulated by the inner heat-insulating ring and the heat-insulating column core during the heating and sintering process, the specific temperature stage is determined by the CO detector, the oxygen amount is adjusted by the adjusting damper valve, the operation is convenient, and the temperature control is not prone to deviation.

[0008] The preparation method of the ion exchange resin permanent magnetic material in the high-speed water treatment process, characterized in that it comprises the following steps:

[0009] (1) Dissolve ferrous salt in water to prepare a ferrous salt solution with a concentration of 0.1-1 mol / L, and dissolve carbonate in water to prepare a carbonate solution with a concentration of 0.1-1 mol / L;

[0010] Preferably, the ferrous salt is one or more of industrial-grade FeSO4, FeSO4·7H2O, FeCl2, FeCO3, Fe3(PO4)2, and Fe(NO3)2.

[0011] Preferably, the carbonate is one of Na2CO3 and K2CO3.

[0012] (2) Pump the carbonate solution into the ferrous salt solution, stir for 30-60 min, and allow the carbonate solution and the ferrous salt solution to undergo a double decomposition reaction, so that the mixed solution gradually becomes a flocculent precipitate. Centrifugal filtration is performed on the flocculent precipitate to remove excess water, thereby obtaining an active ferrous carbonate precipitate.

[0013] (3) Place dry ice in advance in an ion exchange resin magnetic material sintering furnace, load the prepared active ferrous carbonate precipitate into the ion exchange resin magnetic material sintering furnace, and heat to a temperature of 200-250°C to remove water from the active ferrous carbonate.

[0014] The ion exchange resin magnetic material sintering furnace is implemented in the following manner: the ion exchange resin magnetic material sintering furnace comprises a furnace body and a furnace door,

[0015] characterized in that the furnace door is detachably arranged on the furnace body, the furnace body comprises, from the outside to the inside, a furnace shell, an insulating layer, a heating module, and a furnace cavity, a gap exists between the insulating layer and the furnace shell to form an air insulation layer, thereby reducing heat loss, the heating module is arranged close to the furnace cavity and forms a wrapping around the furnace cavity, the furnace cavity is rotatably arranged in the heating module, the furnace cavity is provided with blades, the blades scatter the precursor during rotation of the furnace cavity, the furnace door comprises an inner insulation ring and an insulation column core for plugging the furnace cavity and insulating the furnace cavity, the furnace door is provided with a gas outlet channel, and a CO detector is arranged on the gas outlet channel.

[0016] Preferably, the furnace shell is a shell structure that can be opened and closed.

[0017] The furnace shell is arranged on a support frame.

[0018] The insulating layer is arranged in the furnace shell through an isolation frame.

[0019] Preferably, the distance between the outer side of the insulating layer and the inner side of the furnace shell is greater than the thickness of the insulating layer.

[0020] The heating module is arranged in the insulating layer.

[0021] Preferably, the heating module is composed of two semicircular shell parts, each part is equipped with an electric heating wire,

[0022] The furnace cavity is rotatably arranged in the heating module,

[0023] Preferably, there is a gap between the outer side of the furnace cavity and the inner side of the heating module,

[0024] Preferably, the furnace cavity is open at one end and closed at the other end, and the open end extends out of the furnace shell,

[0025] The supporting roller is arranged on the roller support, the roller support is arranged on the support frame, and the supporting roller and the side of the furnace cavity extending out of the furnace shell are in rotational contact,

[0026] Preferably, the part of the side of the furnace cavity extending out of the furnace shell and in contact with the supporting roller is sleeved with a protective ring, the inner ring surface of the protective ring is fixedly connected with the outer wall of the furnace cavity, and the outer ring surface of the protective ring is in rolling contact with the supporting roller,

[0027] The other end of the furnace cavity is provided with a rotating column, one end of the rotating column is fixedly connected with the other end of the furnace cavity, and the other end of the rotating column extends out of the furnace shell through the avoiding hole formed on the heating module, the heat insulation layer and the furnace shell,

[0028] Preferably, the part of the rotating column located in the furnace shell has a larger cross-sectional diameter than the part located outside the furnace shell,

[0029] One side of the furnace shell corresponding to the rotating column is provided with a protective support, a rotating support sleeve is arranged on the protective support and rotatably arranged on the rotating column, and the rotating support sleeve and the part of the rotating column extending out of the furnace shell are in rotational contact to form a support,

[0030] A material turning gear is sleeved on the side of the rotating column, the material turning gear is located in the protective support, the material turning gear is drivingly connected through a chain and a transmission gear, the transmission gear is arranged on the gear shaft of a material turning motor, and the material turning motor is arranged on the support frame,

[0031] A plurality of groups of blades are equidistantly arranged on the inner side of the furnace cavity, each group of blades has a plurality of blades, and the plurality of blades in the same group are equidistantly arranged along the axial direction of the furnace cavity,

[0032] Preferably, one side edge of the blade is obliquely connected with the inner wall of the furnace cavity, and the other side edge of the blade obliquely extends towards the center of the furnace cavity,

[0033] Preferably, the blade extends in an arc shape from one end to the other end,

[0034] Preferably, the other end of the blade is provided with a beveled edge,

[0035] Preferably, a plurality of groups of inclined holes are formed on the blade, the plurality of groups of inclined holes are equidistantly arranged along the length direction of the blade, one group of the inclined holes has a plurality of inclined holes, the plurality of inclined holes in the same group are equidistantly arranged along the width direction of the blade, and adjacent two groups of inclined holes are staggered arranged,

[0036] The furnace door is composed of a closing door, an air adjusting channel, a shutter air adjusting valve, a heat preservation column core, an inner heat preservation ring and a CO detector,

[0037] The inner heat preservation ring is detachably arranged in the furnace cavity and located at one end of the opening of the furnace cavity,

[0038] Preferably, the inner heat preservation ring is a hollow structure, the inner heat preservation ring is provided with an inner recessed handle at the end thereof, the number of the inner heat preservation rings is greater than or equal to 1, and the outer wall of the inner heat preservation ring is tightly attached to the inner wall of one end of the furnace cavity,

[0039] The heat preservation column core is detachably arranged in the inner heat preservation ring,

[0040] Preferably, the heat preservation column core is provided with an inner recessed handle at the end thereof, the heat preservation column core is a hollow structure, and the two ends of the heat preservation column core are flush with the two ends of the inner heat preservation ring,

[0041] The closing door is openable and closable only at one end of the opening of the furnace cavity through a lock buckle, the closing door is provided with an air adjusting channel, the air adjusting channel and the inner heat preservation ring are coaxially arranged, and the air adjusting channel is in communication with the furnace cavity,

[0042] The shutter air adjusting valve is movably arranged in the air adjusting channel, and the CO detector is arranged on the closing door and in communication with the furnace body through an air outlet channel;

[0043] (4) After heating to the disappearance of steam, the furnace temperature of the permanent magnetic material sintering furnace is increased to 350-450℃ for calcination, the active ferrous carbonate is completely decomposed into active magnetite by calcination, and then cooled to 200-250℃;

[0044] (5) Air (oxygen) is introduced, the active magnetite reacts with O2, the temperature is controlled at 300-500℃, and under this condition, Fe3O4 is converted into γ-Fe2O3;

[0045] (6) After natural cooling to room temperature, the permanent magnetic material γ-iron oxide is obtained. Advantages

[0046] I. The heating module heats the furnace cavity, and the precursor can be oxygenized sintering to form a permanent magnetic material.

[0047] II. In the heating sintering process, the furnace chamber is insulated by the inner insulation ring and the insulation column core, the specific temperature stage is determined by the CO detector, the oxygen flow is adjusted by adjusting the shutter damper valve, the operation is convenient, the temperature control is not easy to deviate, and the final product has high phase purity.

[0048] III. In the process of oxygen sintering, the furnace chamber is turned over, the blade drives the pie-shaped precipitated precursor to be scattered and turned over, so that the precursor can be fully contacted with oxygen and uniformly heated, thereby improving the purity and uniformity of the final product.

[0049] IV. The sintered material can be quickly removed from the furnace, which is convenient to use.

[0050] V. The heat insulation layer and the air insulation layer can provide double insulation, reduce heat dissipation, and improve the heating and insulation effect of the furnace chamber.

[0051] VI. Reduce the influence of heat radiation on the surrounding environment and personnel, improve the temperature environment in the workshop, and provide a more comfortable working environment for workers. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is a structure diagram of the ion exchange resin magnetic material sintering furnace of the utility model;

[0053] Figure 2 is a structure diagram of the ion exchange resin magnetic material sintering furnace of the utility model;

[0054] Figure 3 is a perspective view of the ion exchange resin magnetic material sintering furnace of the utility model, which only shows the structure of the inner insulation ring;

[0055] DRAWINGS

[0056] Among them:

[0057] The closed door (1), the air adjusting channel (2), the shutter damper valve (3), the insulation column core (4), the inner insulation ring (5), the furnace shell (6), the heat insulation layer (7), the furnace chamber (8), the protection support (9), the turning gear (10), the rotating support sleeve (11), the rotating column (12), the chain (13), the transmission gear (14), the turning motor (15), the isolation frame (16), the heating module (17), the blade (18), the support frame (19), the roller support (20), the support roller (21), the CO detector (22), the protection ring (23). DETAILED DESCRIPTION EMBODIMENT

[0058] The preparation method of the ion exchange resin permanent magnetic material in the high-speed water treatment process, characterized in that it comprises the following steps:

[0059] (1) Dissolve ferrous salt in water to prepare a ferrous salt solution with a concentration of 0.1-1 mol / L, and dissolve carbonate in water to prepare a carbonate solution with a concentration of 0.1-1 mol / L;

[0060] Preferably, the ferrous salt is one or more of industrial-grade FeSO4, FeSO4·7H2O, FeCl2, FeCO3, Fe3(PO4)2, and Fe(NO3)2,

[0061] Preferably, the carbonate is one of Na2CO3 and K2CO3.

[0062] (2) Pump the carbonate solution into the ferrous salt solution, stir for 30-60 min, and allow the carbonate solution and the ferrous salt solution to undergo a double decomposition reaction, so that the mixed solution gradually becomes a flocculent precipitate. Centrifugal filtration is performed on the flocculent precipitate to remove excess water, thereby obtaining an active ferrous carbonate precipitate;

[0063] (3) Put dry ice in advance in an ion exchange resin magnetic material sintering furnace, and put the prepared active ferrous carbonate precipitate into a permanent magnetic material sintering furnace, heat to 200-250℃, and remove the water in the active ferrous carbonate;

[0064] The ion exchange resin magnetic material sintering furnace is implemented in the following manner: the ion exchange resin magnetic material sintering furnace comprises a furnace body and a furnace door,

[0065] characterized in that the furnace door is detachably arranged on the furnace body, the furnace body comprises, from the outside to the inside, a furnace shell (6), an insulating layer (7), a heating module (17), and a furnace cavity (8), there is a gap between the insulating layer (7) and the furnace shell (6), forming an air insulation layer to reduce heat loss, the heating module (17) is close to the furnace cavity (8) and forms a wrapping around the furnace cavity (8), the furnace cavity (8) is rotatably arranged in the heating module (17), the furnace cavity (8) is internally provided with a blade (18), the blade (18) scatters the precursor during the rotation of the furnace cavity (8), the furnace door comprises an inner heat preservation ring (5) and a heat preservation column core (4) for plugging the furnace cavity (8) and heat preservation of the furnace cavity (8), the furnace door adjusts the air intake amount through a gate valve (3), the furnace door is provided with an air outlet channel, and a CO detector (22) is arranged on the air outlet channel,

[0066] Preferably, the furnace shell (6) is a shell structure that can be opened and closed,

[0067] the furnace shell (6) is arranged on a support frame (19),

[0068] the insulating layer (7) is arranged in the furnace shell (6) through an isolation frame (16),

[0069] Preferably, the distance between the outer side of the heat-insulating layer (7) and the inner side of the furnace shell (6) is greater than the thickness of the heat-insulating layer (7).

[0070] The heating module (17) is placed in the insulation layer (7).

[0071] Preferably, the heating module (17) is composed of two semicircular shell parts, each of which is equipped with a heating wire.

[0072] The furnace chamber (8) is rotatably placed in the heating module (17).

[0073] Preferably, there is a gap between the outer side of the furnace cavity (8) and the inner side of the heating module (17).

[0074] Preferably, the furnace cavity (8) is open at one end and closed at the other end, and one end of the opening extends to the outside of the furnace shell (6).

[0075] The supporting roller (21) is placed on a roller bracket (20), and the roller bracket (20) is placed on a support frame (19). The supporting roller (21) is in rotational contact with the side of the furnace cavity (8) extending outside the furnace shell (6).

[0076] Preferably, a protective ring (23) is provided on the side of the furnace cavity (8) extending outside the furnace shell (6) and in contact with the support roller (21), the inner ring surface of the protective ring (23) is fixedly connected to the outer wall of the furnace cavity (8), and the outer ring surface of the protective ring (23) is in rolling contact with the support roller (21).

[0077] A rotating column (12) is provided at the other end of the furnace cavity (8), one end of the rotating column (12) is fixedly connected to the other end of the furnace cavity (8), and the other end of the rotating column (12) passes through the heating module (17), the insulation layer (7) and the avoidance hole provided on the furnace shell (6) to extend to the outside of the furnace shell (6).

[0078] Preferably, the cross-sectional diameter of the portion of the rotating column (12) located inside the furnace shell (6) is larger than the cross-sectional diameter of the portion located outside the furnace shell (6).

[0079] A protective bracket (9) is provided on one side of the furnace shell (6) corresponding to the rotating column (12), a rotating support sleeve (11) is placed on the protective bracket (9), and a rotatable sleeve is placed on the rotating column (12), and the rotating support sleeve (11) and the portion of the rotating column (12) extending out of the furnace shell (6) are in rotational contact to form a support.

[0080] A turning gear (10) is sleeved on the side of the rotating column (12), and the turning gear (10) is located in the protective bracket (9). The turning gear (10) is connected to the transmission gear (14) through a chain (13). The transmission gear (14) is placed on the gear shaft of the turning motor (15), and the turning motor (15) is placed on the support frame (19).

[0081] Multiple groups of blades (18) are equidistantly arranged on the inner side of the furnace cavity (8), and the multiple groups of blades (18) are equidistantly arranged along the circumference of the furnace cavity (8). A group of blades (18) has multiple blades, and the multiple blades (18) in the same group are equidistantly arranged along the axial direction of the furnace cavity (8).

[0082] Preferably, one side of the blade (18) is obliquely connected to the inner wall of the furnace cavity (8), and the other side of the blade (18) extends obliquely toward the center of the furnace cavity (8).

[0083] Preferably, the blade (18) extends in an arc shape from one end to the other end.

[0084] Preferably, the other end of the blade (18) is provided with a beveled edge.

[0085] Preferably, the blade (18) is provided with a plurality of groups of inclined holes, the plurality of groups of inclined holes being arranged equidistantly along the length direction of the blade (18), a group of inclined holes having a plurality of inclined holes, the plurality of inclined holes in the same group being arranged equidistantly along the width direction of the blade (18), and adjacent groups of inclined holes being arranged in a staggered manner.

[0086] The furnace door is composed of a closed door (1), an air regulating channel (2), a gate air regulating valve (3), an insulation column core (4), an inner insulation ring (5) and a CO detector (22).

[0087] The inner insulation ring (5) is detachably placed in the furnace cavity (8) and is located at one end of the opening of the furnace cavity (8).

[0088] Preferably, the inner insulation ring (5) is a hollow structure, an inwardly concave handle is provided at the end of the inner insulation ring (5), the number of the inner insulation rings (5) is greater than or equal to 1, and the outer wall of the inner insulation ring (5) is tightly fitted to the inner wall of one end of the furnace cavity (8).

[0089] The insulation column core (4) is detachably placed in the inner insulation ring (5).

[0090] Preferably, the end of the heat-insulating column core (4) is provided with a concave handle, the heat-insulating column core (4) is a hollow structure, and the two ends of the heat-insulating column core (4) are flush with the two ends of the heat-insulating inner ring.

[0091] The closed door (1) can be opened and closed only at one end of the furnace chamber (8) by means of a lock. An air-conditioning channel (2) is provided on the closed door (1). The air-conditioning channel (2) and the inner heat-insulating ring (5) are coaxially arranged. The air-conditioning channel (2) and the furnace chamber (8) are in communication.

[0092] The gate gas regulating valve (3) is movably placed in the gas regulating channel (2), the CO detector (22) is placed on the closed door (1), and the CO detector (22) is connected to the furnace body through the gas outlet channel;

[0093] (4) After heating until the steam disappears, the permanent magnetic material sintering furnace temperature is raised to 350-450℃ for calcination until the active ferrous carbonate is completely decomposed into active ferrosoferric oxide, and then cooled to 200-250℃;

[0094] (5) Air (oxygen) is introduced, and the active ferroferric oxide reacts with O2. The temperature is controlled at 300-500℃. Under this condition, Fe3O4 is converted into γ-Fe2O3.

[0095] (6) After cooling naturally to room temperature, the mixture is taken out to obtain the permanent magnetic material γ-iron oxide.

[0096] When in use, the upper temperature limit of the furnace chamber (8) is set to 400-600°C, the filtered raw materials are filled into the furnace chamber (8), and then the inner insulation ring (5) and the insulation column core (4) are loaded. During the loading process, the inner insulation ring (5) and the insulation column core (4) push the raw materials to move into the furnace chamber (8) to prevent the raw materials from accumulating at the furnace mouth, close the closed door (1), start the turning motor (15), and the turning motor (15) drives the turning gear (10) to rotate through the transmission gear (14) and the chain (13), and the turning gear (10) drives the furnace chamber (8) through the rotating column (12). ) rotates to ensure that the furnace chamber (8) rotates forward so that the raw materials are evenly distributed in the furnace chamber (8). At the same time, the blades (18) break up the raw materials in the furnace chamber (8) as the furnace chamber (8) rotates, and then heats to remove moisture in the raw materials. The moisture in the raw materials is discharged from the gas outlet channel. After the moisture disappears, the temperature is raised and calcined until the raw materials are completely decomposed, that is, the CO concentration detector shows that the CO concentration is zero. Then, the raw materials are cooled, the heat preservation column core (4) is taken out, and the gate valve (3) is rotated to control the amount of air introduced and the temperature is controlled at 300-500°C. Under this condition, Fe3O4 is converted into γ-Fe2O3;

[0097] The heat insulation layer (7) cooperates with the air insulation layer to insulate the heating module (17), double insulation can effectively reduce the heat loss of the sintering furnace, help to stabilize the internal temperature of the sintering furnace, avoid the influence of external temperature change on the sintering process, ensure the sintering quality and consistency, effectively reduce the surface temperature of the sintering furnace shell (6), reduce the risk of scalding caused by accidental contact with the hot surface of the operator, reduce the heat emission of the sintering furnace to the environment, improve the temperature environment in the workshop, and provide a more comfortable working environment for the staff;

[0098] A plurality of groups of blades (18) are equidistantly arranged on the inner side of the furnace cavity (8), and a plurality of groups of blades (18) are equidistantly arranged along the circumference of the furnace cavity (8). A plurality of blades (18) in the same group are equidistantly arranged along the axis of the furnace cavity (8). The design can scatter the raw materials during rotation, uniformly disperse the raw materials in the furnace cavity (8), ensure uniform heating of the raw materials, and fully contact the oxygen, thereby improving the purity of the final product.

[0099] One side of the blade (18) is obliquely connected to the inner wall of the furnace cavity (8), and the other side of the blade (18) obliquely extends towards the center of the furnace cavity (8). The relative movement of the blade (18) and the raw materials occurs with the rotation of the furnace cavity (8). The obliquely distributed blades (18) can increase the contact area with the raw materials and scatter the raw materials more evenly. At the same time, the oblique blades (18) can increase the flow path of the raw materials in the furnace cavity (8), reduce the accumulation of the raw materials, avoid dead angles in the material turning process, ensure uniform heating of the raw materials, and fully contact the oxygen, thereby improving the purity of the final product.

[0100] The blade (18) extends from one end to the other end in an arc shape. The design can promote the flow of the blade (18) in the furnace cavity (8) while scattering the raw materials, promote the generation of more convection and vortex, make the raw materials more evenly dispersed in the furnace cavity (8), improve the uniformity of the raw materials, and fully contact the oxygen, thereby improving the purity of the final product. At the same time, the impact resistance of the arc-shaped blade (18) is also high, which can effectively avoid deformation of the blade (18) during the process of scattering the raw materials.

[0101] The other end of the blade (18) is provided with a beveled edge design, which can reduce the unevenness of the raw materials during the scattering process, reduce friction loss, ensure uniform heating of the raw materials, and fully contact the oxygen, thereby improving the purity of the final product.

[0102] The blade (18) is provided with a plurality of groups of inclined holes, the plurality of groups of inclined holes are equidistantly arranged along the length direction of the blade (18), one group of the inclined holes has a plurality of inclined holes, the plurality of inclined holes in the same group are equidistantly arranged along the width direction of the blade (18), and the adjacent two groups of inclined holes are staggered arranged, so that the raw materials can be subjected to greater shearing force and friction force when passing through the inclined holes during the scattering of the raw materials, the raw materials are prevented from being agglomerated, the phenomenon of incomplete scattering is avoided, the uniformity of the raw material dispersion is improved, the uniformity of the raw material heating is improved, the raw materials are fully contacted with oxygen, and the purity of the final product is improved.

[0103] The oxygen can be passed through the precursor to be sintered, the furnace cavity (8) is insulated by the inner insulation ring (5) and the insulation column core (4) during the heating and sintering process, the specific temperature stage is determined by the CO detector (22), the oxygen passing amount is adjusted by adjusting the shutter damper valve (3), the operation is convenient, and the temperature control deviation is not prone to occur.

[0104] It should be noted that, unless otherwise explicitly specified and limited, the terms "placed", "connected", and "connected" should be understood broadly, for example, it can be a fixed connection mode such as folding connection, rivet connection, pin connection, bonding connection and welding connection, or it can be a detachable connection mode such as screw connection, buckle connection and hinge connection, or it can be integrated connection, or it can be electrical connection, or it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. An ion exchange resin magnetic material sintering furnace, the furnace comprising a furnace body and a furnace door, characterized in that: The furnace door is detachably arranged on the furnace body, the furnace body is sequentially provided with an outer shell, an insulation layer, a heating module and a furnace cavity from outside to inside, a gap exists between the insulation layer and the outer shell to form an air insulation layer, reduce heat loss, the heating module is close to the furnace cavity and forms a package for the furnace cavity, the furnace cavity is rotatably arranged in the heating module, the furnace cavity is provided with blades, the blades scatter the precursors during the rotation of the furnace cavity, the furnace door comprises an inner insulation ring and an insulation column core for blocking the furnace cavity and heat preservation, the furnace door adjusts the air intake amount through a gate valve, the furnace door is provided with an air outlet channel, and a CO detector is arranged on the air outlet channel.

2. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that The outer shell is a shell structure that can be opened and closed, the outer shell is arranged on a support frame, the insulation layer is arranged in the outer shell through an isolation frame, the distance between the outer side of the insulation layer and the inner side of the outer shell is greater than the thickness of the insulation layer, the heating module is arranged in the insulation layer, and the heating module is composed of two semicircular shells, each shell is provided with an electric heating wire.

3. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that The furnace cavity is rotatably arranged in the heating module, a gap exists between the outer side of the furnace cavity and the inner side of the heating module, one end of the furnace cavity is open, the other end is closed, and the open end extends out of the outer shell.

4. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that One end of the furnace cavity is supported by a supporting roller, the supporting roller is arranged on a roller support, the roller support is arranged on the support frame, the supporting roller is in rotational contact with the side of the furnace cavity extending out of the outer shell, the side of the furnace cavity extending out of the outer shell is sleeved with a protective ring at the part in contact with the supporting roller, the inner ring surface of the protective ring is fixedly connected with the outer wall of the furnace cavity, and the outer ring surface of the protective ring is in rolling contact with the supporting roller.

5. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that The other end of the furnace cavity is provided with a rotating column, one end of the rotating column is fixedly connected with the other end of the furnace cavity, the other end of the rotating column extends out of the outer shell through the avoiding holes formed in the heating module, the insulation layer and the outer shell, the cross-sectional diameter of the part of the rotating column located in the outer shell is greater than the cross-sectional diameter of the part of the rotating column located outside the outer shell, one side of the outer shell corresponding to the rotating column is provided with a protective support, a rotating support sleeve is arranged on the protective support and rotatably arranged on the rotating column, the rotating support sleeve and the part of the rotating column extending out of the outer shell are in rotational contact to form a support, a material stirring gear is sleeved on the side of the rotating column, the material stirring gear is located in the protective support, the material stirring gear is in transmission connection through a chain and a transmission gear, the transmission gear is arranged on the gear shaft of a material stirring motor, and the material stirring motor is arranged on the support frame.

6. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that A plurality of groups of blades are equidistantly arranged on the inner side of the furnace cavity, a plurality of groups of the blades are equidistantly arranged along the circumference of the furnace cavity, one group of the blades comprises a plurality of blades, the plurality of blades in the same group are equidistantly arranged along the axis of the furnace cavity, one side edge of the blade is obliquely connected with the inner wall of the furnace cavity, the other side edge of the blade obliquely extends towards the center of the furnace cavity, the blade extends in an arc shape from one end to the other end, the other end of the blade is provided with a beveled edge, a plurality of groups of inclined holes are formed in the blade, the plurality of groups of the inclined holes are equidistantly arranged along the length direction of the blade, a plurality of groups of the inclined holes comprise a plurality of inclined holes, the plurality of inclined holes in the same group are equidistantly arranged along the width direction of the blade, and adjacent two groups of the inclined holes are staggered.

7. The ion exchange resin magnetic material sintering furnace according to claim 2, characterized in that The furnace door is composed of a closing door, an air adjusting channel, a shutter air adjusting valve, a heat preservation column core, an inner heat preservation ring and a CO detector, the inner heat preservation ring is detachably arranged in the furnace cavity and located at one end of the furnace cavity opening, the heat preservation column core is detachably arranged in the inner heat preservation ring, the closing door is openable and closable only at one end of the furnace cavity opening through a lock buckle, the closing door is provided with the air adjusting channel, the air adjusting channel and the inner heat preservation ring are coaxially arranged, the air adjusting channel is in communication with the furnace cavity, the shutter air adjusting valve is movably arranged in the air adjusting channel, the CO detector is arranged on the closing door and in communication with the furnace body through an air outlet channel.

8. The ion exchange resin magnetic material sintering furnace according to claim 7, characterized in that The heat preservation column core is provided with an inner recessed handle at the end, the heat preservation column core is a hollow structure, and the two ends of the heat preservation column core are flush with the two ends of the heat preservation inner ring.

9. The ion exchange resin magnetic material sintering furnace according to claim 7, characterized in that The inner heat preservation ring is a hollow structure, the inner heat preservation ring is provided with an inner recessed handle at the end, the number of the inner heat preservation rings is greater than or equal to 1, and the outer wall of the inner heat preservation ring is tightly attached to the inner wall of one end of the furnace cavity.

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