Ion exchange resin magnetic material sintering furnace

Abstract

The invention discloses an ion exchange resin magnetic material sintering furnace which is used for performing oxygen introduction sintering on a precursor, performing 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 flashboard 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 invention discloses an ion exchange resin magnetic material sintering furnace, which relates to a key device capable of producing permanent magnetic materials and belongs to the technical field of water treatment, and particularly relates to a sintering furnace which performs oxygen sintering on a precursor, insulates a furnace cavity through an inner insulation ring and an insulation column core during the heating and sintering process, determines a specific temperature stage through a CO detector, adjusts the oxygen flow rate through an adjusting gate plate gas regulating valve, is easy to operate, and is not prone to temperature control 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 guide 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 precipitated and separated. After the magnetic agglomeration force and stirring action of the resin reach a balance, a stable suspended reaction layer is formed to allow water and resin to completely contact and react to complete 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., wherein the co-precipitation method is a method of adding a precipitant to a metal salt solution to co-precipitate the cations in the solution to obtain 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, which has 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 the high-speed water treatment process of the suspended reaction layer. In addition, in the process of preparing magnetic iron oxide powder by the existing co-precipitation method, nitrogen protection needs to be introduced during the precipitation reaction to obtain the precursor. In actual industrial production, the cost is high, the process is complicated, the operation is difficult, and it is not suitable for the mass production of permanent magnetic materials.

[0003] Publication No. CN117247052A discloses a method for preparing magnetic ferroferric oxide by oxidation coprecipitation. The ferroferric oxide is prepared by oxidation coprecipitation, using a divalent iron source as a raw material and hydrogen peroxide as an oxidant to oxidize Fe2+ so that the molar ratio of Fe2+ to Fe3+ in the system is 1:2; then a precipitant is added to react under heating conditions to obtain nano-scale ferroferric oxide particles, hydrogen peroxide is mixed with an ammonium ferrous sulfate solution, sulfuric acid is added to adjust the pH value of the solution, and the solution is heated to a target temperature, and then a precipitant sodium hydroxide solution is added to adjust the pH value of the solution again. Under appropriate pH conditions, Fe2+ and Fe3+ in the system will precipitate simultaneously, and after standing and cooling for 10 minutes, ferroferric oxide nanoparticles with good magnetic responsiveness can be obtained; Publication No. CN115676899A discloses a method for preparing nano ferroferric oxide, comprising the following steps: mixing ferrous oxalate with an aqueous solution of a strong base for solid-liquid reaction to obtain a reaction solution, and the temperature of the solid-liquid reaction The reaction mixture is aged at 20 to 80°C and the aging time is 1 to 4 hours to obtain nano-iron tetroxide. Publication No. CN115159586A discloses an iron tetroxide magnetic powder for water treatment and a preparation method thereof. The preparation method comprises: preparing an iron salt solution and a precipitant solution, adding the solution to a reactor for coprecipitation reaction; stirring the solution for magnetization reaction to obtain a first slurry; classifying the first slurry to obtain a powder having a particle size smaller than the classified particle size and a second slurry containing magnetic particles; returning the powder to the reactor as a seed template for growth; washing the second slurry, spray drying, and obtaining iron tetroxide powder. The ferrite prepared by the above coprecipitation method is mostly iron tetroxide in the final product. Iron tetroxide is a paramagnetic material with a weak response to a 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 magnetic ion exchange resins, and is not suitable for high-speed water treatment processes of suspended reaction layers.

[0004] Publication No. CN116692953A discloses a nano γ-Fe 2 O 3 The preparation method thereof comprises mixing ferrous oxalate and a hydrogen peroxide aqueous solution for oxidation reaction, mixing the obtained oxidation reaction liquid with an alkaline solution and then aging the mixture to obtain the nano γ-Fe 2 O 3 ; The alkaline solution includes an alkali metal hydroxide, an organic dispersant and water; Publication No. CN107572597A discloses a γ-Fe 2 O 3 Preparation method of nanomaterials, using Fe(NO3)3·9H 2O reacts with L-tartaric acid in water to obtain a reddish brown viscous liquid, which is placed in an air blast oven for drying to obtain a gray-green solid powder, which is placed in a muffle furnace for calcination to obtain γ-Fe 2 O 3 Nanoparticles; The gamma iron oxide obtained by the applicant using the above method is not easily modified in the process of preparing the magnetic ion exchange resin, and the final product obtained is of insufficient purity and contains more other oxides, such as ferroferric oxide, alpha iron oxide and other paramagnetic materials, which is not suitable for the high-speed water treatment process of the suspended reaction layer.

[0005] In order to improve the above problems, the applicant filed another Chinese invention patent application entitled "A method for preparing a permanent magnetic material of ion exchange resin in a high-speed water treatment process". The method obtains active ferrous carbonate by double decomposition reaction between carbonate solution and ferrous salt solution, and then calcines until the active ferrous carbonate is completely decomposed into active ferroferric oxide, and then oxidizes the active ferroferric oxide at a suitable temperature to control the Fe 3 O 4 All converted into γ-Fe 2 O 3 The final product has high purity. The gamma iron oxide produced after calcination and oxidation is easily modified in the process of preparing magnetic ion exchange resins, and is suitable for high-speed water treatment processes in suspended reaction layers. In the preparation process, since the active ferrous carbonate precursor is very sensitive to temperature, the process of heating and calcining it is complicated. Precise temperature control is required at each stage to ensure the formation of the target product. Ordinary rotary kilns cannot assist operators in determining specific temperature stages, and the control operation of the oxygen-passing calcination process is complex and lacks flexibility. The calcination temperature and oxygen flow rate are prone to deviations, resulting in the final product containing paramagnetic materials such as ferrosoferric oxide and alpha iron oxide, and the final product has low phase purity.

[0006] Publication No. CN221301927U discloses a sealed energy-saving rotary furnace, comprising a bottom plate, a furnace body is installed on the top of the bottom plate, a feed pipe is installed at one end of the furnace body, a discharge pipe is installed at the other end of the furnace body, a loading pipe is installed above the feed pipe, a loading chamber is installed at the top of the loading pipe, a loading port is arranged above the loading chamber, and a feeding mechanism is arranged inside the loading chamber and the loading pipe; Publication No. CN221301926U discloses an automatic rotary furnace for denitrification combustion-supporting agent, comprising a fixed bracket, a movable bracket and a furnace body, both sides of the front end of the movable bracket are rotatably connected to the fixed bracket, a first driving member for driving the movable bracket to flip is installed on the fixed bracket, a first supporting plate and a second supporting plate are respectively installed on the front end and the rear end of the top of the movable bracket, the furnace body is rotatably installed between the first supporting plate and the second supporting plate, a second driving member for driving the furnace body to rotate is installed on the movable bracket, A cover plate for sealing the furnace body opening is rotatably installed on the front side of the first support plate, and two groups of control components for opening and closing the cover plate are symmetrically installed on the first support plate. Publication No. CN221288012U discloses a slag remover rotary furnace, including a material box, a feed hopper and a rotary furnace body, two crushing rollers rotating in opposite directions are arranged in the feed box, an oblique sub-screen is arranged at the lower end of the crushing roller, a conveying box is arranged on the side wall of the feed box, and a spiral output rod is arranged in the conveying box. Publication No. CN118345345A discloses a vapor deposition coated rotary furnace, including a furnace tube, a driving mechanism for driving the furnace tube to rotate, a first air intake assembly, a second air intake assembly, an exhaust assembly, a vacuum assembly, a first rotary joint and a second rotary joint, the first air intake assembly and the second air intake assembly are connected to the inside of the furnace tube through the first rotary joint, and the exhaust assembly and the vacuum assembly are connected to the inside of the furnace tube through the second rotary joint. The above-mentioned rotary kiln cannot assist the operator in determining the specific temperature stage, and the control operation of the oxygen calcination process is complicated and lacks flexibility. The calcination temperature and oxygen flow rate are prone to deviations, resulting in the final product containing paramagnetic materials such as ferrosoferric oxide and α-iron oxide, and the final product has low phase purity. Summary of the invention

[0007] In order to improve the above situation, an ion exchange resin magnetic material sintering furnace of the present invention provides a method for oxygen-permeable sintering of a precursor, wherein the furnace chamber is insulated by an inner insulation ring and an insulation column core during the heating and sintering process, the specific temperature stage is determined by a CO detector, and the oxygen flow rate is adjusted by adjusting a gate plate gas regulating valve. The sintering furnace is easy to operate and temperature control is not prone to deviation.

[0008] The method for preparing a high-speed water treatment process ion exchange resin permanent magnetic material is characterized by comprising the following steps: (1) dissolving ferrous salt in water to prepare a ferrous salt solution with a concentration of 0.1-1 mol / L, and dissolving carbonate in water to prepare a carbonate solution with a concentration of 0.1-1 mol / L; Preferably, the ferrous salt is industrial grade FeSO 4 , FeSO 4 7H 2 O,FeCl 2 , FeCO 3 , Fe 3 (PO4) 2 ,Fe(NO3) 2 One or more of Preferably, the carbonate is Na 2 CO 3 , K 2 CO 3 One of; (2) Pumping the carbonate solution into the ferrous salt solution and stirring for 30-60 min, the carbonate solution and the ferrous salt solution undergo double decomposition reaction, and the mixed solution gradually turns into flocculent precipitation. The flocculent precipitation is centrifuged and filtered to remove excess water to obtain active ferrous carbonate precipitation; (3) placing dry ice in the ion exchange resin magnetic material sintering furnace in advance, loading the prepared activated ferrous carbonate precipitate into the ion exchange resin magnetic material sintering furnace, heating the furnace to 200-250° C., and removing water from the activated ferrous carbonate; The ion exchange resin magnetic material sintering furnace of the present invention is realized as follows: the ion exchange resin magnetic material sintering furnace of the present invention comprises a furnace body and a furnace door, The invention is characterized in that the furnace door is detachably placed on the furnace body, and the furnace body is composed of a furnace shell, an insulating layer, a heating module and a furnace cavity from the outside to the inside. There is a gap between the insulating layer and the furnace shell to form an air insulation layer to reduce the escape of heat. The heating module is close to the furnace cavity and wraps the furnace cavity. The furnace cavity is rotatably located in the heating module. Blades are built into the furnace cavity. The blades break up the precursor during the rotation of the furnace cavity. The furnace door comprises an inner insulation ring and an insulation column core for sealing the furnace cavity and keeping the furnace cavity warm. The furnace door adjusts the air intake through a gate air regulating valve. An air outlet channel is opened on the furnace door, and a CO detector is arranged on the air outlet channel. Preferably, the furnace shell is an openable and closable shell structure. The furnace shell is placed on a support frame. The insulation layer is placed inside the furnace shell through an isolation frame. Preferably, the distance between the outer side of the insulation layer and the inner side of the furnace shell is greater than the thickness of the insulation layer. The heating module is placed in the insulation layer. Preferably, the heating module is composed of two semicircular shell parts, each of which is equipped with a heating wire. The furnace cavity is rotatably placed in the heating module. Preferably, there is a gap between the outer side of the furnace cavity and the inner side of the heating module. Preferably, the furnace cavity has an opening at one end and a closed end at the other end, and one end of the opening extends outside the furnace shell. The supporting roller is placed on a roller bracket, and the roller bracket is placed on a supporting frame. The supporting roller is in rotational contact with the side of the furnace cavity extending outside the furnace shell. Preferably, a protective ring is sleeved on the part where the side of the furnace chamber extending outside the furnace shell contacts the support roller, the inner ring surface of the protective ring is fixedly connected to the outer wall of the furnace chamber, and the outer ring surface of the protective ring is in rolling contact with the support roller. A rotating column is disposed at the other end of the furnace cavity, one end of the rotating column is fixedly connected to the other end of the furnace cavity, and the other end of the rotating column passes through the heating module, the insulation layer and the avoidance hole opened on the furnace shell and extends to the outside of the furnace shell. Preferably, the cross-sectional diameter of the portion of the rotating column located inside the furnace shell is larger than the cross-sectional diameter outside the furnace shell. A protective bracket is arranged on one side of the furnace shell corresponding to the rotating column, a rotating support sleeve is arranged on the protective bracket, and a rotatable sleeve is arranged on the rotating column, and the rotating support sleeve and the part of the rotating column extending out of the furnace shell are rotated and contacted to form a support. A turning gear is sleeved on the side of the rotating column, and the turning gear is located in the protective bracket. The turning gear is connected to the transmission gear through a chain, and the transmission gear is placed on the gear shaft of the turning motor, and the turning motor is placed on the support frame. Multiple groups of blades are evenly arranged on the inner side of the furnace cavity, and the blades are evenly arranged along the circumference of the furnace cavity. A group of blades has multiple blades, and the blades in the same group are evenly arranged along the axial direction of the furnace cavity. Preferably, one side of the blade is obliquely connected to the inner wall of the furnace cavity, and the other side of the blade extends obliquely toward the center of the furnace cavity. Preferably, the blade extends in an arc shape from one end to the other end. Preferably, the other end of the blade is provided with a chamfered edge. Preferably, the blade is provided with a plurality of groups of inclined holes, the plurality of groups of inclined holes are arranged equidistantly along the length direction of the blade, a group of the inclined holes has a plurality of inclined holes, the plurality of inclined holes in the same group are arranged equidistantly along the width direction of the blade, and two adjacent groups of inclined holes are arranged in a staggered manner. The furnace door is composed of a closed door, an air regulating channel, a gate air regulating valve, an insulation column core, an inner insulation ring and a CO detector. The inner insulation ring is detachably placed in the furnace cavity and is located at one end of the furnace cavity opening. Preferably, the inner insulation ring is a hollow structure, a concave handle is provided at the end of the inner insulation ring, the number of the inner insulation rings is greater than or equal to 1, and the outer wall of the inner insulation ring is tightly fitted with the inner wall of one end of the furnace cavity. The insulation column core can be detachably placed in the inner insulation circle. Preferably, a concave handle is provided at the end of the heat-insulating column core, the heat-insulating column core is a hollow structure, and the two ends of the heat-insulating column core are flush with the two ends of the heat-insulating inner ring. The closed door can be opened and closed only at one end of the furnace cavity by means of a lock. An air-adjusting channel is arranged on the closed door. The air-adjusting channel and the inner insulation ring are coaxially arranged. The air-adjusting channel and the furnace cavity are connected. The gate gas regulating valve is movably placed in the gas regulating channel, the CO detector is placed on the closed door, and the CO detector is connected to the furnace body through the gas outlet channel; (4) After heating until the steam disappears, the permanent magnetic material sintering furnace temperature is raised to 350-450°C for calcination until the active ferrous carbonate is completely decomposed into active ferrosoferric oxide, and then cooled to 200-250°C; (5) Air (oxygen) is introduced, and the active ferroferric oxide reacts with O 2 Reaction, control the temperature at 300-500℃, under this condition Fe 3 O 4 Converted to γ-Fe 2 O 3 ; (6) After naturally cooling to room temperature, the mixture is taken out to obtain the permanent magnetic material γ-iron oxide. Beneficial Effects

[0009] 1. The heating module heats the furnace chamber and can sinter the precursor through oxygen to form a permanent magnetic material.

[0010] 2. During the heating and 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, and the oxygen flow is adjusted by adjusting the gate valve. It is easy to operate, the temperature control is not prone to deviation, and the final product has high phase purity.

[0011] 3. During the oxygen sintering process, the furnace chamber flips, driving the blades to break up the cake-like precipitated precursor and flip the material, so that the precursor can fully contact with oxygen and be heated evenly, thereby improving the purity and uniformity of the final product.

[0012] 4. The sintered materials can be quickly removed from the furnace, which is easy to use.

[0013] 5. The heat insulation layer and the air insulation layer can provide double insulation, reduce heat dissipation, and have a good heating and heat preservation effect in the furnace cavity.

[0014] 6. Reduce the impact of heat radiation on the surrounding environment and personnel, improve the temperature environment in the workshop, and provide a more comfortable working environment for staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a sintering furnace for ion exchange resin magnetic materials of the present invention; Figure 2 It is a structural schematic diagram of a sintering furnace for ion exchange resin magnetic materials of the present invention; Figure 3 This is a three-dimensional structural diagram of an ion exchange resin magnetic material sintering furnace of the present invention, which only shows the structure of the inner insulation ring; Attached photos

[0016] Among them: A closed door (1), an air regulating passage (2), a gate air regulating valve (3), an insulation column core (4), an inner insulation ring (5), a furnace shell (6), an insulation layer (7), a furnace chamber (8), a protective bracket (9), a material turning gear (10), a rotating support sleeve (11), a rotating column (12), a chain (13), a transmission gear (14), a material turning motor (15), an isolation frame (16), a heating module (17), blades (18), a support frame (19), a roller bracket (20), a supporting roller (21), a CO detector (22), and a protective ring (23). DETAILED DESCRIPTION Example

[0017] The method for preparing a high-speed water treatment process ion exchange resin permanent magnetic material is characterized by comprising the following steps: (1) dissolving ferrous salt in water to prepare a ferrous salt solution with a concentration of 0.1-1 mol / L, and dissolving carbonate in water to prepare a carbonate solution with a concentration of 0.1-1 mol / L; Preferably, the ferrous salt is industrial grade FeSO 4 , FeSO 4 7H 2 O,FeCl 2 , FeCO 3 , Fe 3 (PO4) 2 ,Fe(NO3) 2 One or more of Preferably, the carbonate is Na 2 CO 3 , K 2 CO 3 One of; (2) Pumping the carbonate solution into the ferrous salt solution and stirring for 30-60 min, the carbonate solution and the ferrous salt solution undergo double decomposition reaction, and the mixed solution gradually turns into flocculent precipitation. The flocculent precipitation is centrifuged and filtered to remove excess water to obtain active ferrous carbonate precipitation; (3) Put dry ice in the ion exchange resin magnetic material sintering furnace in advance, put the prepared active ferrous carbonate precipitate into the permanent magnetic material sintering furnace, heat it to 200-250°C, and remove the water in the active ferrous carbonate; The ion exchange resin magnetic material sintering furnace of the present invention is realized as follows: the ion exchange resin magnetic material sintering furnace of the present invention comprises a furnace body and a furnace door, The invention is characterized in that the furnace door is detachably placed on the furnace body, and the furnace body is composed of a furnace shell (6), an insulating layer (7), a heating module (17) and a furnace cavity (8) from the outside to the inside. There is a gap between the insulating layer (7) and the furnace shell (6) to form an air insulation layer to reduce the escape of heat. The heating module (17) is close to the furnace cavity (8) and wraps the furnace cavity (8). The furnace cavity (8) is rotatably located in the heating module (17). The furnace cavity (8) is provided with blades (18) which break up the precursor during the rotation of the furnace cavity (8). The furnace door comprises an inner insulation ring (5) and an insulation column core (4) for sealing the furnace cavity (8) and keeping the furnace cavity (8) warm. The furnace door adjusts the air intake through a gate air regulating valve (3). An air outlet channel is opened on the furnace door, and a CO detector (22) is arranged on the air outlet channel. Preferably, the furnace shell (6) is an openable and closable shell structure. The furnace shell (6) is placed on a support frame (19). The heat insulating layer (7) is placed inside the furnace shell (6) via an isolation frame (16). 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). The heating module (17) is placed in the thermal insulation layer (7). Preferably, the heating module (17) is composed of two semicircular shell parts, each of which is equipped with a heating wire. The furnace chamber (8) is rotatably placed in the heating module (17). Preferably, there is a gap between the outer side of the furnace cavity (8) and the inner side of the heating module (17). Preferably, the furnace cavity (8) is open at one end and closed at the other end, and the open end extends to the outside of the furnace shell (6). The supporting roller (21) is placed on a roller bracket (20), the roller bracket (20) is placed on a supporting frame (19), and the supporting roller (21) is in rotational contact with a side surface of a furnace cavity (8) extending outside the furnace shell (6). Preferably, a protective ring (23) is sleeved on the part of the side of the furnace chamber (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 chamber (8); and the outer ring surface of the protective ring (23) is in rolling contact with the support roller (21). A rotating column (12) is disposed 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); 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) and extends to the outside of the furnace shell (6). 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). A protective bracket (9) is disposed on one side of the furnace shell (6) corresponding to the rotating column (12); a rotating support sleeve (11) is disposed on the protective bracket (9), and a rotatable sleeve is disposed on the rotating column (12); 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 support. A material turning gear (10) is sleeved on the side of the rotating column (12), and the material turning gear (10) is located in the protective bracket (9). The material 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 material turning motor (15), and the material turning motor (15) is placed on the support frame (19). A plurality of groups of blades (18) are arranged at equal intervals on the inner side surface of the furnace cavity (8); the plurality of groups of blades (18) are arranged at equal intervals along the circumference of the furnace cavity (8); a group of blades (18) has a plurality of blades; the plurality of blades (18) in the same group are arranged at equal intervals along the axial direction of the furnace cavity (8); 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). Preferably, the blade (18) extends in an arc shape from one end to the other end. Preferably, the other end of the blade (18) is provided with a beveled edge. 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 two adjacent groups of inclined holes being arranged in a staggered manner. 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). 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). 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). The heat-insulating column core (4) is detachably placed in the inner heat-insulating ring (5). 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. The closed door (1) can be opened and closed by means of a lock, and only the opening end of the furnace chamber (8) is provided. The closed door (1) is provided with an air-adjusting passage (2). The air-adjusting passage (2) and the inner heat-insulating ring (5) are coaxially arranged. The air-adjusting passage (2) and the furnace chamber (8) are in communication. The gate gas regulating valve (3) is movably disposed in the gas regulating passage (2), the CO detector (22) is disposed on the closed door (1), and the CO detector (22) is connected to the furnace body through the gas outlet passage; (4) After heating until the steam disappears, the permanent magnetic material sintering furnace temperature is raised to 350-450°C for calcination until the active ferrous carbonate is completely decomposed into active ferrosoferric oxide, and then cooled to 200-250°C; (5) Air (oxygen) is introduced, and the active ferroferric oxide reacts with O 2 Reaction, control the temperature at 300-500℃, under this condition Fe 3 O 4 Converted to γ-Fe 2 O 3 ; (6) After naturally cooling to room temperature, the mixture is taken out to obtain the permanent magnetic material γ-iron oxide.

[0018] When in use, the upper temperature limit of the furnace chamber (8) is set to 400-600°C, the filtered raw materials are loaded 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. The closed door (1) is closed, and the material turning motor (15) is started. The material turning motor (15) drives the material turning gear (10) to rotate through the transmission gear (14) and the chain (13). The material turning gear (10) is rotated through the rotating column (12 ) drives the furnace chamber (8) to rotate, ensuring 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, and then 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, Fe 3 O 4 Converted to γ-Fe 2 O 3 ; The heat insulating layer (7) is designed to cooperate with the air heat insulating layer to insulate the heating module (17). The double heat insulation can effectively reduce the heat energy loss of the sintering furnace, help stabilize the internal temperature of the sintering furnace, avoid the influence of external temperature changes on the sintering process, ensure the sintering quality and consistency, and can effectively reduce the surface temperature of the sintering furnace shell (6), reduce the risk of burns caused by accidental contact of operators with hot surfaces, reduce the heat emitted by the sintering furnace to the environment, improve the temperature environment in the workshop, and provide a more comfortable working environment for the staff; The inner side surface of the furnace chamber (8) is equidistantly provided with a plurality of groups of blades (18), the plurality of groups of blades (18) being equidistantly arranged along the circumference of the furnace chamber (8), a group of blades (18) comprising a plurality of blades, and the plurality of blades (18) in the same group being equidistantly arranged along the axial direction of the furnace chamber (8), can break up the raw materials during the rotation process, so that the raw materials are evenly dispersed in the furnace chamber (8), ensuring that the raw materials are evenly heated and fully contacted with oxygen, thereby improving the purity of the final product; One side of the blade (18) is obliquely connected to the inner wall of the furnace chamber (8), and the other side of the blade (18) extends obliquely toward the center of the furnace chamber (8). The blade (18) and the raw material move relative to each other as the furnace chamber (8) rotates. The obliquely distributed blades (18) can increase the contact area with the raw material, making the raw material more dispersed. At the same time, the oblique blades (18) can increase the flow path of the raw material in the furnace chamber (8), reduce the accumulation of raw materials, avoid the existence of dead corners for turning over materials, ensure that the raw materials are heated evenly, and fully contact with oxygen, thereby improving the purity of the final product. The blade (18) is designed to extend in an arc shape from one end to the other end, which can promote the flow of the blade (18) in the furnace chamber (8) while breaking up the raw materials, promote the generation of more convection and eddy currents, make the raw materials more evenly dispersed in the furnace chamber (8), improve the uniformity of heating of the raw materials, and fully contact with oxygen, thereby improving the purity of the final product. At the same time, the arc-shaped blade (18) has a high impact resistance, and can effectively prevent the blade (18) from being deformed during the process of breaking up the raw materials. The other end of the blade (18) is provided with a beveled edge, which can reduce the unevenness of the raw material at the turning point of the blade (18) during the dispersion process, reduce friction loss, ensure that the raw material is heated evenly and fully in contact with oxygen, and improve the purity of the final product; The blade (18) has 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 the design of staggered arrangement of two adjacent groups of inclined holes, so that when the raw materials are dispersed, the raw materials are subjected to greater shear force and friction force through the inclined holes, thereby preventing the raw materials from agglomerating and incompletely being dispersed, improving the uniformity of the dispersion of the raw materials, improving the uniformity of the heating of the raw materials, and allowing the raw materials to fully contact with oxygen, thereby improving the purity of the final product; The precursor can be sintered with oxygen, the furnace chamber (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), and the oxygen flow rate is adjusted by adjusting the gate gas regulating valve (3), the operation is convenient, and the temperature control is not prone to deviation.

[0019] It should be noted that, unless otherwise clearly specified and limited, the terms "placed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection method such as a folding connection, a rivet connection, a pin connection, a bonding connection and a welding connection, or a detachable connection method such as a threaded connection, a snap connection and a hinge connection, or an integral connection, or an electrical connection, or a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to 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 placed on the furnace body, and the furnace body is composed of a furnace shell, an insulating layer, a heating module and a furnace cavity from the outside to the inside. There is a gap between the insulating layer and the furnace shell to form an air insulation layer to reduce the escape of heat. The heating module is close to the furnace cavity and wraps the furnace cavity. The furnace cavity is rotatably located in the heating module. Blades are arranged in the furnace cavity. The blades break up the precursor during the rotation of the furnace cavity. The furnace door includes an inner insulation ring and an insulation column core for sealing the furnace cavity and keeping the furnace cavity warm. The furnace door adjusts the air intake through a gate air regulating valve. An air outlet channel is opened on the furnace door, and a CO detector is arranged on the air outlet channel. The ion exchange resin magnetic material sintering furnace is used for a preparation method of ion exchange resin permanent magnetic material in a high-speed water treatment process.

2. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that The furnace shell is an openable and closable shell structure, the furnace shell is placed on a support frame, the insulation layer is placed in the furnace shell through an isolation frame, the distance between the outer side of the insulation layer and the inner side of the furnace shell is greater than the thickness of the insulation layer, the heating module is placed in the insulation layer, the heating module consists of two semicircular shell parts, each part is equipped 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 placed in the heating module, and there is a gap between the outer side of the furnace cavity and the inner side of the heating module. One end of the furnace cavity is open and the other end is closed, and one end of the opening extends to the outside of the furnace shell.

4. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that One end of the furnace chamber is supported by a supporting roller, and the supporting roller is placed on a roller bracket, and the roller bracket is placed on a supporting bracket. The supporting roller is in rotational contact with the side surface of the furnace chamber extending outside the furnace shell, and a protective ring is provided at the portion where the side surface of the furnace chamber extending outside the furnace shell contacts the supporting roller. The inner ring surface of the protective ring is fixedly connected to the outer wall of the furnace chamber, 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 A rotating column is provided at the other end of the furnace cavity, one end of the rotating column is fixedly connected to the other end of the furnace cavity, and the other end of the rotating column extends to the outside of the furnace shell through the heating module, the insulation layer and the avoidance hole opened on the furnace shell, the cross-sectional diameter of the part of the rotating column located inside the furnace shell is larger than the cross-sectional diameter located outside the furnace shell, and a protective bracket is provided on a side of the furnace shell corresponding to the rotating column, a rotating support sleeve is placed on the protective bracket, and a rotatable sleeve is placed on the rotating column, the rotating support sleeve and the part of the rotating column extending out of the furnace shell are rotatably contacted to form a support, and a turning gear is provided on the side of the rotating column, the turning gear is located in the protective bracket, the turning gear is connected through a chain and a transmission gear, the transmission gear is placed on the gear shaft of the turning motor, and the turning motor is placed 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 surface of the furnace cavity, and the plurality of groups of blades are equidistantly arranged along the circumference of the furnace cavity. A 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. One side of the blade is obliquely connected to the inner wall of the furnace cavity, and the other side of the blade extends obliquely toward the center of the furnace cavity. The blade extends in an arc shape from one end to the other end, and a chamfered edge is arranged at the other end of the blade. A plurality of groups of inclined holes are opened on the blade, and the plurality of groups of inclined holes are equidistantly arranged along the length direction of the blade. A group of inclined holes has a plurality of inclined holes, and the plurality of inclined holes in the same group are equidistantly arranged along the width direction of the blade, and two adjacent groups of 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 closed door, an air regulating channel, a gate air regulating valve, an insulation column core, an inner insulation ring and a CO detector. The inner insulation ring is detachably placed in the furnace cavity and is located at one end of the furnace cavity opening. The insulation column core is detachably placed in the inner insulation ring. Only the furnace cavity opening end of the closed door can be opened and closed by a lock. The closed door is provided with an air regulating channel. The air regulating channel and the inner insulation ring are coaxially arranged. The air regulating channel is connected to the furnace cavity. The gate air regulating valve is movably placed in the air regulating channel. The CO detector is placed on the closed door, and the CO detector is connected to 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 end of the heat-insulating column core is provided with a concave handle, the heat-insulating column core is a hollow structure, and the two ends of the heat-insulating column core are flush with the two ends of the heat-insulating inner ring.

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

10. The ion exchange resin magnetic material sintering furnace according to claim 1, characterized in that The method for preparing the high-speed water treatment process ion exchange resin permanent magnetic material comprises the following steps: (1) dissolving ferrous salt in water to prepare a ferrous salt solution with a concentration of 0.1-1 mol / L, and dissolving carbonate in water to prepare a carbonate solution with a concentration of 0.1-1 mol / L; (2) Pumping the carbonate solution into the ferrous salt solution and stirring for 30-60 min, the carbonate solution and the ferrous salt solution undergo double decomposition reaction, and the mixed solution gradually turns into flocculent precipitation. The flocculent precipitation is centrifuged and filtered to remove excess water to obtain active ferrous carbonate precipitation; (3) placing dry ice in the ion exchange resin magnetic material sintering furnace in advance, loading the prepared activated ferrous carbonate precipitate into the ion exchange resin magnetic material sintering furnace, heating the furnace to 200-250° C., and removing water from the activated ferrous carbonate; (4) After heating until the steam disappears, the temperature of the ion exchange resin magnetic material sintering furnace is raised to 350-450°C for calcination until the active ferrous carbonate is completely decomposed into active ferrosoferric oxide, and then cooled to 200-250°C; (5) Air (oxygen) is introduced, and the active ferroferric oxide reacts with O2. The temperature is controlled at 300-500°C. Under this condition, Fe3O4 is converted into γ-Fe2O3. (6) After naturally cooling to room temperature, the mixture is taken out to obtain the permanent magnetic material γ-iron oxide.

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