Circulating cooling device for mixed acid rare earth slurry

Abstract

The utility model discloses a mixed acid rare earth slurry circulating cooling device, which comprises a reaction kettle, a cooling device, a cooling device and a cooling device, wherein the top end of the reaction kettle is provided with a feed port and an exhaust port, and the bottom of the reaction kettle is provided with a discharge port; the stirring assembly is mounted at the top of the reaction kettle, and the output end of the stirring assembly extends into the reaction kettle; a circulation inlet and a circulation outlet are formed in the side face of the reaction kettle, the circulation inlet is located over the circulation outlet, a slurry inlet of the heat exchange assembly is fixedly communicated with the circulation outlet through a feeding pipe, and a slurry outlet of the heat exchange assembly is fixedly communicated with the circulation outlet through a backflow pipe; wherein a slurry pump is mounted on the feeding pipe. According to the utility model, the reactor, the slurry pump and the heat exchanger are connected in series to form a closed loop, and the mixed acid rare earth slurry in the reaction kettle is subjected to indirect heat exchange with cooling water through the heat exchanger by adopting an extracorporeal circulation cooling mode, so that the mixed acid rare earth slurry can be quickly cooled, and the time required by material cooling is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of rare earth mineral smelting equipment, in particular to a mixed acid rare earth slurry circulating cooling device. Background Art

[0002] Currently, the decomposition of mixed rare earth concentrates primarily utilizes a high-temperature roasting decomposition process using concentrated sulfuric acid. Rare earth minerals are roasted in concentrated sulfuric acid at high temperatures to produce roasted ore, which is then leached with water to produce a rare earth sulfate solution. Application Publication No. CN109022838A discloses a method for treating fluorine-containing rare earth mineral particles. This involves slurrying the mixed rare earth concentrate with sulfuric acid solution. After the reaction, the acid leaching solution and residue are recovered through solid-liquid separation and washing. The residue is then leached with water to recover rare earth sulfate leachate and residue. The acid leaching solution then continues to react with the mixed rare earth concentrate with additional sulfuric acid. To ensure complete decomposition of the fluorine-containing minerals, the reaction temperature is maintained above 130°C and the sulfuric acid solution concentration is maintained above 60%. During the reaction, the decomposition of the fluorine-containing minerals results in a certain concentration of fluoride ions in the acid leaching solution. Because mixed rare earth minerals contain apatite, the slurrying process produces some phosphoric acid, ultimately forming a rare earth slurry containing a mixture of sulfuric acid, hydrofluoric acid, and phosphoric acid. After the slurry decomposition reaction is completed, the slurry temperature is above 130°C and needs to be cooled to below 90°C for solid-liquid separation. If natural cooling is used, it takes a long time and greatly reduces work efficiency. Based on this, the utility model provides a mixed acid rare earth slurry circulating cooling device. Utility Model Content

[0003] The purpose of the utility model is to provide a mixed acid rare earth slurry circulating cooling device to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a mixed acid rare earth slurry circulating cooling device, comprising:

[0005] A reactor, wherein a feed port and an exhaust port are provided at the top of the reactor, and a discharge port is provided at the bottom of the reactor;

[0006] A stirring assembly, wherein the stirring assembly is installed on the top of the reactor, and an output end of the stirring assembly extends into the reactor;

[0007] A heat exchange component, wherein a circulation inlet and a circulation outlet are provided on the side of the reactor, wherein the circulation inlet is located directly above the circulation outlet, the slurry inlet of the heat exchange component and the circulation outlet are fixedly connected via a feed pipe, and the slurry outlet of the heat exchange component and the circulation outlet are fixedly connected via a return pipe;

[0008] Wherein, a slurry pump is installed on the feed pipe.

[0009] According to the mixed acid rare earth slurry circulating cooling device provided by the utility model, the stirring assembly includes a stirring motor fixedly connected to the top of the reactor, the output shaft of the stirring motor is fixedly connected to a stirring paddle, the stirring paddle extends into the reactor, and the axis of the stirring paddle is collinear with the axis of the stirring kettle.

[0010] According to the mixed acid rare earth slurry circulating cooling device provided by the utility model, an exhaust gas collecting processor is installed on the exhaust port.

[0011] According to the mixed acid rare earth slurry circulating cooling device provided by the utility model, the heat exchange component is a graphite shell and tube heat exchanger or a silicon carbide shell and tube heat exchanger.

[0012] According to the mixed acid rare earth slurry circulating cooling device provided by the utility model, electromagnetic control valves are respectively installed on the feed pipe and the reflux pipe.

[0013] According to the mixed acid rare earth slurry circulating cooling device provided by the utility model, a temperature sensor and a pressure sensor are installed in the reactor.

[0014] The utility model discloses the following technical effects:

[0015] The mixed acid rare earth slurry with a temperature above 130°C obtained by the slurry reaction of rare earth minerals and sulfuric acid solution enters the reactor through the feed port on the top of the reactor. When the slurry liquid level exceeds the circulation inlet on the side of the reactor, the slurry pump is turned on. At this time, the mixed acid slurry in the reactor passes through the circulation outlet, slurry pump, heat exchange component, and circulation inlet in sequence to achieve circulation cooling.

[0016] The utility model connects the reactor, slurry pump and heat exchanger in series to form a closed loop, adopts an extracorporeal circulation cooling method, and indirectly exchanges heat between the mixed acid rare earth slurry in the reactor and cooling water through the heat exchanger, thereby achieving rapid cooling of the mixed acid rare earth slurry, greatly reducing the time required for material cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is a structural schematic diagram of the mixed acid rare earth slurry circulating cooling device of the utility model.

[0019] Among them, 1. Reactor; 2. Feed inlet; 3. Discharge port; 4. Circulation outlet; 5. Slurry inlet; 6. Slurry outlet; 7. Circulation inlet; 8. Slurry pump; 9. Heat exchange component; 10. Exhaust port; 11. Agitator. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] Reference Figure 1 The utility model provides a mixed acid rare earth slurry circulating cooling device, comprising:

[0023] Reactor 1, with a feed port 2 and an exhaust port 10 provided at the top and a discharge port 3 provided at the bottom;

[0024] A stirring assembly is installed on the top of the reactor 1, and an output end of the stirring assembly extends into the reactor 1;

[0025] The heat exchange component 9 and the side of the reactor 1 are provided with a circulation inlet 7 and a circulation outlet 4. The circulation inlet 7 is located directly above the circulation outlet 4. The slurry inlet 5 of the heat exchange component 9 and the circulation outlet 4 are fixedly connected via a feed pipe. The slurry outlet 6 of the heat exchange component 9 and the circulation outlet 4 are fixedly connected via a reflux pipe.

[0026] Wherein, a slurry pump 8 is installed on the feed pipe.

[0027] The mixed acid rare earth slurry with a temperature above 130° C. obtained by the slurry reaction of rare earth minerals and sulfuric acid solution enters the reactor 1 through the feed port 2 at the top of the reactor 1. When the slurry liquid level exceeds the circulation inlet 7 on the side of the reactor 1, the slurry pump 8 is turned on. At this time, the mixed acid slurry in the reactor 1 passes through the circulation outlet 4, the slurry pump 8, the heat exchange component 9, and the circulation inlet 7 in sequence to achieve circulation cooling.

[0028] The utility model connects the reactor, slurry pump 8 and heat exchanger in series to form a closed loop, adopts extracorporeal circulation cooling, and indirectly exchanges heat between the mixed acid rare earth slurry in the reactor 1 and cooling water through the heat exchanger to achieve rapid cooling of the mixed acid rare earth slurry, greatly reducing the time required for material cooling.

[0029] To further optimize the solution, the stirring assembly includes a stirring motor fixedly connected to the top of the reactor 1, the output shaft of the stirring motor is fixedly connected to a stirring paddle 11, the stirring paddle 11 extends into the reactor 1, and the axis of the stirring paddle 11 is collinear with the axis of the stirring reactor.

[0030] To further optimize the solution, an exhaust gas collection processor is installed on the exhaust port 10. The exhaust gas collection processor is used to collect the exhaust gas generated by the reaction and reduce the pollution of the device to the air.

[0031] In a further optimized solution, the heat exchange component 9 is a graphite tube heat exchanger or a silicon carbide tube heat exchanger. The graphite tube heat exchanger or the silicon carbide tube heat exchanger has good thermal conductivity and can withstand high temperature mixed acid corrosion.

[0032] To further optimize the solution, electromagnetic control valves are installed on the feed pipe and return pipe respectively. The setting of the electromagnetic control valve can control the speed of material flow and ensure the cooling effect.

[0033] To further optimize the solution, a temperature sensor and a pressure sensor are installed in the reactor 1. The temperature and pressure in the reactor 1 are monitored by the temperature sensor and the pressure sensor. At the same time, temperature sensors are installed on the feed pipe and the reflux pipe respectively to detect the temperature of the slurry entering and leaving the reactor 1.

[0034] The utility model operates as follows: A mixed acid rare earth slurry (above 130°C) produced by the slurry reaction of rare earth minerals and sulfuric acid solution enters reactor 1 through feed port 2 at the top. When the slurry level exceeds the circulation inlet 7 on the side of reactor 1, slurry pump 8 is activated. The mixed acid slurry in reactor 1 then passes through circulation outlet 4, slurry pump 8, heat exchanger assembly 9, and circulation inlet 7, achieving circulation cooling. The heat exchanger is a graphite tube heat exchanger or silicon carbide tube heat exchanger, with the mixed acid slurry on the tube side and cooling circulating water on the shell side. Indirect heat transfer between the mixed acid slurry and the cooling circulating water occurs continuously in the heat exchanger, ultimately cooling the mixed acid slurry. During the feeding and cooling process, agitator paddles 11 are activated to ensure uniform mixing of the materials. Acid gases generated during the feeding and cooling process are transported through exhaust port 10 to an exhaust gas collection and treatment unit for treatment. When the temperature of the mixed acid rare earth slurry drops below 90°C, it is discharged through discharge port 3.

[0035] 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.

[0036] 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. A mixed acid rare earth slurry circulating cooling device, characterized in that: include: A reactor (1), wherein a feed port (2) and an exhaust port (10) are provided at the top of the reactor (1), and a discharge port (3) is provided at the bottom of the reactor (1); A stirring assembly, the stirring assembly being mounted on the top of the reactor (1), and an output end of the stirring assembly extending into the reactor (1); A heat exchange component (9), a circulation inlet (7) and a circulation outlet (4) are provided on the side of the reactor (1), the circulation inlet (7) is located directly above the circulation outlet (4), the slurry inlet (5) of the heat exchange component (9) and the circulation outlet (4) are fixedly connected via a feed pipe, and the slurry outlet (6) of the heat exchange component (9) and the circulation outlet (4) are fixedly connected via a reflux pipe; Wherein, a slurry pump (8) is installed on the feed pipe.

2. The mixed acid rare earth slurry circulating cooling device according to claim 1, characterized in that: The stirring assembly comprises a stirring motor fixedly connected to the top of the reactor (1); the output shaft of the stirring motor is fixedly connected to a stirring paddle (11); the stirring paddle (11) extends into the reactor (1); and the axis of the stirring paddle (11) is collinear with the axis of the stirring reactor.

3. The mixed acid rare earth slurry circulating cooling device according to claim 1, characterized in that: An exhaust gas collecting processor is installed on the exhaust port (10).

4. The mixed acid rare earth slurry circulating cooling device according to claim 1, characterized in that: The heat exchange component (9) is a graphite tube heat exchanger or a silicon carbide tube heat exchanger.

5. The mixed acid rare earth slurry circulating cooling device according to claim 1, characterized in that: The feed pipe and the return pipe are respectively equipped with electromagnetic control valves.

6. The mixed acid rare earth slurry circulating cooling device according to claim 1, characterized in that: A temperature sensor and a pressure sensor are installed in the reactor (1).

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