External heating continuous reaction device for rare earth ore sulfuric acid slurrying decomposition

Abstract

The utility model discloses an external heating continuous reaction device for rare earth ore sulfuric acid slurrying decomposition, which comprises a reactor, the reactor comprises a plurality of stages of steel lining polytetrafluoroethylene reaction kettles which are sequentially connected in series, the steel lining polytetrafluoroethylene reaction kettles are provided with overflow ports and feed ports, the overflow ports are positioned above the feed ports, and the feed ports are positioned above the feed ports. An exhaust port is formed in the top end of the steel lining polytetrafluoroethylene reaction kettle; a plurality of groups of stirring assemblies are arranged, and the plurality of groups of stirring assemblies are respectively arranged in the plurality of stages of steel lining polytetrafluoroethylene reaction kettles; the heat exchange mechanisms are respectively mounted on any one of the steel lining polytetrafluoroethylene reaction kettles, and the heat exchange mechanisms are fixedly communicated with the steel lining polytetrafluoroethylene reaction kettles; the feed port of the first-stage steel lining polytetrafluoroethylene reaction kettle is fixedly connected with a feed pipe, and the overflow port of the last-stage steel lining polytetrafluoroethylene reaction kettle is fixedly communicated with a discharge pipe. According to the utility model, the continuous overflow flow of slurry is realized by adopting a mode of connecting the reaction kettles in series, and the device is high in reaction efficiency and continuous in discharging.

Description

Technical Field

[0001] The utility model relates to the technical field of wet smelting of rare earth minerals, in particular to an in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth minerals. Background Art

[0002] The Bayan Obo mixed rare earth concentrate is composed of bastnaesite and monazite. Currently, the main industrialized rare earth concentrate decomposition technologies are concentrated sulfuric acid high-temperature roasting decomposition and concentrated alkaline solution atmospheric pressure decomposition. However, neither the high-temperature acid process nor the alkaline process can achieve the comprehensive utilization of the rare earths, fluorine, and phosphorus in the mineral.

[0003] In order to achieve the comprehensive utilization of valuable elements in mixed rare earth minerals, many domestic researchers have developed new processes for rare earth mineral smelting. Patent CN109022838A discloses a method for processing fluorine-containing rare earth mineral particles. The fluorine-containing rare earth mineral particles are mixed with a sulfuric acid solution in a certain proportion, and then heated and insulated to perform a liquid-solid reaction. The tail gas is condensed and absorbed by the tail gas treatment system to obtain a fluorine-silicon mixed acid product. The concentration of the sulfuric acid solution is 40-85wt%, and the reaction temperature is 100-180°C. This method can achieve rapid decomposition of fluorine-containing rare earth mineral particles, the reaction is easy to control, and the residual acid resources are recycled at the same time. However, the problems of how to achieve material heating, continuous input and output, and corrosion resistance and wear resistance of equipment have not been solved. Based on this, the utility model provides an in vitro heating continuous reaction device for the sulfuric acid slurry decomposition of rare earth ores. Utility Model Content

[0004] The purpose of the utility model is to provide an in vitro heating continuous reaction device for sulfuric acid pulp decomposition of rare earth ores, so as to solve the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides an in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores, comprising:

[0006] The reactor comprises several stages of steel-lined polytetrafluoroethylene reactors connected in series, the steel-lined polytetrafluoroethylene reactors are provided with an overflow port and a feed port, the overflow port is located above the feed port, and the top of the steel-lined polytetrafluoroethylene reactor is provided with an exhaust port;

[0007] A stirring assembly, wherein the stirring assembly is provided in a plurality of groups, and the plurality of groups of stirring assemblies are respectively installed in a plurality of levels of the steel-lined polytetrafluoroethylene reactor;

[0008] A heat exchange mechanism is installed on each of the steel-lined polytetrafluoroethylene reactors, and the heat exchange mechanism is fixedly connected to the steel-lined polytetrafluoroethylene reactor;

[0009] Among them, the feed port of the steel-lined polytetrafluoroethylene reactor located at the next level is fixedly connected to the overflow port of the steel-lined polytetrafluoroethylene reactor located at the previous level through a conveying pipe, the feed port of the steel-lined polytetrafluoroethylene reactor at the first level is fixedly connected to the feed pipe, and the overflow port of the steel-lined polytetrafluoroethylene reactor at the last level is fixedly connected to the discharge pipe.

[0010] According to the in vitro heating continuous reaction device for the sulfuric acid slurry decomposition of rare earth ores provided by the utility model, the stirring assembly includes a stirring motor fixedly connected to the top of the steel-lined polytetrafluoroethylene reactor, the output shaft of the stirring motor is fixedly connected to a stirring paddle, the axis of the stirring paddle is collinear with the axis of the steel-lined polytetrafluoroethylene reactor, and the stirring paddle extends into the steel-lined polytetrafluoroethylene reactor.

[0011] According to the in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores provided by the utility model, the heat exchange mechanism includes a heat exchanger, the discharge end of the heat exchanger is fixedly connected to the steel-lined polytetrafluoroethylene reactor through a first connecting pipe, and the feed end of the heat exchanger is fixedly connected to the steel-lined polytetrafluoroethylene reactor through a second connecting pipe, and a slurry pump is installed on the second connecting pipe.

[0012] According to the in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores provided by the utility model, a slurry inlet and a slurry outlet are provided on the side wall of the steel-lined polytetrafluoroethylene reactor, the slurry inlet is located above the slurry outlet, the first connecting pipe is fixedly connected to the slurry inlet, and the second connecting pipe is fixedly connected to the slurry outlet.

[0013] According to the in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores provided by the utility model, the exhaust port is fixedly connected to the exhaust gas treatment system through the exhaust pipe.

[0014] According to the in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores provided by the utility model, a temperature sensor and a pressure sensor are installed in the steel-lined polytetrafluoroethylene reactor.

[0015] The utility model discloses the following technical effects:

[0016] During operation, the utility model introduces a mixed slurry of rare earth minerals and sulfuric acid solution into a first-stage steel-lined polytetrafluoroethylene reactor via a feed pipe. The slurry is then heated in vitro through a heat exchange mechanism. As the slurry is continuously added, it flows upward until it overflows and is then fed into the next-stage steel-lined polytetrafluoroethylene reactor via a feed pipe. The slurry heating reaction generates a mixed gas of hydrogen fluoride, silicon tetrafluoride, water vapor, and sulfuric acid mist, which is discharged through the exhaust port of each reactor stage.

[0017] The utility model realizes the continuous overflow flow of slurry by adopting the mode of series connection of reaction kettles, and the reaction efficiency of the device is high, and the material discharge is continuous. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of an in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores according to the present invention.

[0020] Among them, 1. Steel-lined polytetrafluoroethylene reactor; 2. Feed pipe; 3. Overflow port; 4. Feed port; 5. Slurry pump; 6. Second connecting pipe; 7. First connecting pipe; 8. Heat exchanger; 9. Discharge pipe; 10. Exhaust port. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] Reference Figure 1 The utility model provides an in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores, comprising:

[0024] The reactor comprises several stages of steel-lined polytetrafluoroethylene reactors 1 connected in series. The steel-lined polytetrafluoroethylene reactor 1 is provided with an overflow port 3 and a feed port 4. The overflow port 3 is located above the feed port 4. The top of the steel-lined polytetrafluoroethylene reactor 1 is provided with an exhaust port 10.

[0025] Stirring components, the stirring components are provided in several groups, and the several groups of stirring components are respectively installed in several levels of steel-lined polytetrafluoroethylene reactors 1;

[0026] Heat exchange mechanism: a heat exchange mechanism is installed on each steel-lined polytetrafluoroethylene reactor 1, and the heat exchange mechanism is fixedly connected to the steel-lined polytetrafluoroethylene reactor 1;

[0027] Among them, the feed port 4 of the steel-lined polytetrafluoroethylene reactor 1 at the next level is fixedly connected to the overflow port 3 of the steel-lined polytetrafluoroethylene reactor 1 at the previous level through a conveying pipe, the feed port 4 of the first-level steel-lined polytetrafluoroethylene reactor 1 is fixedly connected to the feed pipe 2, and the overflow port 3 of the steel-lined polytetrafluoroethylene reactor 1 at the last level is fixedly connected to the discharge pipe 9.

[0028] During operation, a mixed slurry of rare earth minerals and sulfuric acid solution is fed into a first-stage steel-lined polytetrafluoroethylene reactor (1) via a feed pipe. The slurry is then heated in an extracorporeal circulation system by a heat exchange mechanism. As the slurry is continuously added, it flows upward until it exits an overflow port (3) and is then fed into the next-stage steel-lined polytetrafluoroethylene reactor (1) via a feed pipe. The slurry heating reaction generates a mixed gas of hydrogen fluoride, silicon tetrafluoride, water vapor, and sulfuric acid mist, which is discharged through exhaust ports (10) in each reactor stage.

[0029] The utility model realizes the continuous overflow flow of slurry by adopting the mode of series connection of reaction kettles, and the reaction efficiency of the device is high, and the material discharge is continuous.

[0030] To further optimize the solution, the stirring assembly includes a stirring motor fixedly connected to the top of the steel-lined polytetrafluoroethylene reactor 1, the output shaft of the stirring motor is fixedly connected to a stirring paddle, the axis of the stirring paddle is collinear with the axis of the steel-lined polytetrafluoroethylene reactor 1, and the stirring paddle extends into the steel-lined polytetrafluoroethylene reactor 1.

[0031] To further optimize the solution, the heat exchange mechanism includes a heat exchanger 8, the discharge end of the heat exchanger 8 is fixedly connected to the steel-lined polytetrafluoroethylene reactor 1 through a first connecting pipe 7, and the feed end of the heat exchanger 8 is fixedly connected to the steel-lined polytetrafluoroethylene reactor 1 through a second connecting pipe 6, and a slurry pump 5 is installed on the second connecting pipe 6.

[0032] Heat exchanger 8 is a graphite shell-and-tube heat exchanger or a silicon carbide shell-and-tube heat exchanger. The tube side carries the slurry, while the shell side carries the heating medium. This allows the slurry to be heated to the desired reaction temperature without introducing impurities into the reaction system. The number of reactor stages in this device is determined by the processing capacity; a greater processing capacity requires more stages. The reactor body is constructed of steel lined with PTFE for excellent corrosion and wear resistance.

[0033] To further optimize the solution, a slurry inlet and a slurry outlet are provided on the side wall of the steel-lined polytetrafluoroethylene reactor 1. The slurry inlet is located above the slurry outlet. The first connecting pipe 7 is fixedly connected to the slurry inlet, and the second connecting pipe 6 is fixedly connected to the slurry outlet.

[0034] According to a further optimized solution, the exhaust port 10 is fixedly connected to the exhaust gas treatment system through an exhaust pipe.

[0035] To further optimize the solution, a temperature sensor and a pressure sensor are installed in the steel-lined polytetrafluoroethylene reactor 1.

[0036] When the utility model is in operation, a mixed slurry of rare earth minerals and sulfuric acid solution is fed into the first-stage steel-lined polytetrafluoroethylene reactor 1 through a feed pipe, and the slurry pump 5 is turned on. At this time, the mixed slurry in the steel-lined polytetrafluoroethylene reactor 1 flows back to the steel-lined polytetrafluoroethylene reactor 1 through the slurry outlet slurry pump 5, the second connecting pipe 6, the heat exchanger 8, the first connecting pipe 7, and the slurry inlet. The slurry exchanges heat with the heating medium in the heat exchanger 8, achieving extracorporeal circulation heating. As the slurry is continuously added, the slurry flows upward until it flows out of the overflow port 3, and then is fed into the next-stage steel-lined polytetrafluoroethylene reactor 1 through a connected feed pipe. The slurry heating reaction process produces a mixed gas of hydrogen fluoride, silicon tetrafluoride, water vapor, and sulfuric acid mist. The mixed gas will enter the exhaust gas treatment system through the exhaust port 10 of each reactor.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0038] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An in vitro heating continuous reaction device for sulfuric acid pulp decomposition of rare earth ores, characterized in that: include: A reactor, comprising a plurality of stages of steel-lined polytetrafluoroethylene reactors (1) connected in series, wherein an overflow port (3) and a feed port (4) are provided on the steel-lined polytetrafluoroethylene reactor (1), wherein the overflow port (3) is located above the feed port (4), and an exhaust port (10) is provided at the top of the steel-lined polytetrafluoroethylene reactor (1); A stirring assembly, wherein the stirring assembly is provided in a plurality of groups, and the plurality of groups of stirring assemblies are respectively installed in a plurality of levels of the steel-lined polytetrafluoroethylene reactor (1); A heat exchange mechanism, wherein each of the steel-lined polytetrafluoroethylene reactors (1) is provided with the heat exchange mechanism, and the heat exchange mechanism is fixedly connected to the steel-lined polytetrafluoroethylene reactor (1); The feed port (4) of the steel-lined polytetrafluoroethylene reactor (1) at the next level is fixedly connected to the overflow port (3) of the steel-lined polytetrafluoroethylene reactor (1) at the previous level via a conveying pipe, the feed port (4) of the first-level steel-lined polytetrafluoroethylene reactor (1) is fixedly connected to a feed pipe (2), and the overflow port (3) of the steel-lined polytetrafluoroethylene reactor (1) at the last level is fixedly connected to a discharge pipe (9).

2. The in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores according to claim 1, characterized in that: The stirring assembly includes a stirring motor fixedly connected to the top of the steel-lined polytetrafluoroethylene reactor (1), the output shaft of the stirring motor is fixedly connected to a stirring paddle, the axis of the stirring paddle is collinear with the axis of the steel-lined polytetrafluoroethylene reactor (1), and the stirring paddle extends into the steel-lined polytetrafluoroethylene reactor (1).

3. The in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores according to claim 1, characterized in that: The heat exchange mechanism comprises a heat exchanger (8), the discharge end of the heat exchanger (8) is fixedly connected to the steel-lined polytetrafluoroethylene reactor (1) via a first connecting pipe (7), and the feed end of the heat exchanger (8) is fixedly connected to the steel-lined polytetrafluoroethylene reactor (1) via a second connecting pipe (6), and a slurry pump (5) is installed on the second connecting pipe (6).

4. The in vitro heating continuous reaction device for sulfate pulping and decomposition of rare earth ores according to claim 3, characterized in that: A slurry inlet and a slurry outlet are provided on the side wall of the steel-lined polytetrafluoroethylene reactor (1), wherein the slurry inlet is located above the slurry outlet, the first connecting pipe (7) is fixedly connected to the slurry inlet, and the second connecting pipe (6) is fixedly connected to the slurry outlet.

5. The in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores according to claim 1, characterized in that: The exhaust port (10) is fixedly connected to the exhaust gas treatment system via an exhaust pipe.

6. The in vitro heating continuous reaction device for sulfuric acid slurry decomposition of rare earth ores according to claim 1, characterized in that: A temperature sensor and a pressure sensor are installed in the steel-lined polytetrafluoroethylene reactor (1).

Images