Vacuum solid continuous drying process and device for xanthate

Abstract

According to the vacuum solid continuous drying process and device for xanthate, a belt type vacuum solid drying machine serves as a core, a plurality of crawler belts convey materials in a relay mode, and heating flat plates and cooling flat plates are installed on the inner sides of the crawler belts respectively; a feeding port of the belt type vacuum solid drying machine is connected with a vacuum feeding tank, a normal-pressure feeding tank, a first pneumatic valve, a second pneumatic valve and a third pneumatic valve, a discharging port of the belt type vacuum solid drying machine is connected with a first-stage receiving tank, a second-stage receiving tank, a fourth pneumatic valve, a fifth pneumatic valve and a discharging pneumatic valve, and an evaporation vapor phase outlet condenser and a vacuum system are arranged on the upper portion of the belt type vacuum solid drying machine. The belt type vacuum solid dryer solves the problems that fed materials of the belt type vacuum solid dryer cannot stably fall onto a crawler belt due to impact and raised dust is generated during discharging, so that deviation correction of the crawler belt is affected, continuous drying and cooling of solid xanthate on the crawler belt are achieved, the process is continuous, airtight and automatic, production is stable, caking, dust and spontaneous combustion are avoided, and the product drying index is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical equipment, in particular to a vacuum solid continuous drying process and device for xanthate. BACKGROUND

[0002] The xanthate, i.e. xanthate salt, referred to in the present application is a most widely used, largest amount used and cheapest sulfide ore flotation capturing agent, and is also widely used in the fields of rubber production, analytical chemistry, nano semiconductor materials, etc.

[0003] There are two routes for drying of industrial xanthate, i.e. liquid drying and solid drying. The drying technology for liquid xanthate is mainly belt vacuum liquid dryer, while the drying of solid xanthate is mainly oven drying and disc dryer, etc. At present, the oven drying and disc dryer drying of solid xanthate have problems such as batch intermittent operation, easy self-ignition, low production capacity, easy agglomeration, etc. SUMMARY

[0004] The technical problem to be solved by the present application is to solve the problems existing in the prior art, and to provide a vacuum solid continuous drying process and device for xanthate, so as to realize continuous, closed, automatic and stable production of the drying process of solid xanthate, without agglomeration, dust and self-ignition, with good product drying index, and greatly improving the production efficiency of enterprises.

[0005] The present application also solves the problem that when the belt vacuum solid dryer is fed, the material cannot be smoothly dropped onto the track due to pressure imbalance.

[0006] The present application also solves the problem that when the solid xanthate is discharged after drying, dust is generated due to pressure imbalance, which affects the track deviation correction function of the belt vacuum solid dryer.

[0007] The technical solution adopted by the present application is: A continuous vacuum solid drying device for xanthium, with a belt vacuum solid dryer as its core, contains multiple conveyor belts that relay the material. Heating plates are installed on the inner sides of the conveyor belts closest to the feed point, and cooling plates are installed on the inner sides of the conveyor belts closest to the discharge point. The heating plates and cooling plates are connected to an external heating source and a cooling source, respectively. The upper feed inlet at one end of the belt vacuum solid dryer is connected to a vacuum feed tank via a first pneumatic valve, and the top of the vacuum feed tank is then connected to a second pneumatic valve. A pneumatic valve is connected to an atmospheric pressure feed tank, and a third pneumatic valve is also connected between the vacuum feed tank and the belt vacuum solid dryer; the lower outlet of the other end of the belt vacuum solid dryer is connected to a primary receiving tank, which is connected to a secondary receiving tank via a fourth pneumatic valve, and a discharge pneumatic valve is installed at the bottom of the secondary receiving tank; a fifth pneumatic valve is also connected between the primary and secondary receiving tanks; the vapor phase outlet at the top of the belt vacuum solid dryer is connected to one end of the condenser via a pipe, and the other end of the condenser is connected to the vacuum system via a vacuum exhaust pipe.

[0008] The vacuum system evacuates the belt vacuum solid dryer. The combination and selection of the atmospheric pressure feed tank, vacuum feed tank, and their first, second, and third pneumatic valves at the feed end ensures feeding under balanced pressure. This prevents material from impacting the belt vacuum dryer when pressure is unbalanced, which could cause material to fall unevenly onto the conveyor belt. Pressure balance is also controlled by the timing of the pneumatic valve connections, eliminating the risk of pressure sensor malfunction that was previously relied upon for pressure detection. Similarly, the combination and selection of the primary and secondary receiving tanks, their fourth and fifth pneumatic valves, and the discharge electric valve at the discharge end ensures discharge under balanced pressure. This prevents dust generation due to pressure difference when pressure is unbalanced, which could interfere with the belt vacuum solid dryer's internal conveyor belt alignment function. Pressure balance is also controlled by the timing of the pneumatic valve connections, eliminating the risk of pressure sensor malfunction that was previously relied upon for pressure detection.

[0009] In the above technical solution, the heating plate is connected to the external heating source as follows: one end of the heating plate is connected to the heat medium supply pipe, the other end of the heating plate is connected to the heat medium outlet pipe, and both ends of the heating source are connected to the heat medium supply pipe and the heat medium outlet pipe, respectively.

[0010] In the above technical solution, the cooling plate is connected to the external cooling source as follows: one end of the cooling plate is connected to a cold water supply pipe, the other end of the cooling plate is connected to a cold water return pipe, and both ends of the chiller unit are connected to a cold water supply pipe and a cold water return pipe, respectively.

[0011] In this way, after the solid xanthate is evenly distributed on the conveyor belt, the solvent is evaporated through indirect heat exchange with the heating plate, and the material is dried. However, before discharge, the xanthate is cooled through indirect heat exchange with the cooling plate, thus avoiding the risk of spontaneous combustion caused by high xanthate temperature.

[0012] In the above technical solution, the heating source is a hot water system, a steam system, or a heat transfer oil system, and the chiller is an air-cooled system or a water-cooled unit.

[0013] A continuous vacuum solid drying process for xanthium based on the above-mentioned continuous vacuum solid drying apparatus for xanthium includes: 1. The vacuum system evacuates the belt vacuum solid dryer through the vacuum exhaust pipe, condenser, and evaporator vapor phase outlet pipe; II. Feeding: (1) The atmospheric pressure feed tank receives solid xanthate raw material to be dried from upstream; (2) When it is necessary to feed material into the vacuum feed tank, first close the first pneumatic valve to disconnect the vacuum feed tank from the belt vacuum solid dryer; (3) During the brief period of the first pneumatic valve being closed, the raw material is buffered inside the outlet pipe of the first pneumatic valve and connected to the belt vacuum solid dryer for feeding. (4) Open the second pneumatic valve to connect the atmospheric pressure feed tank and the vacuum feed tank. The pressure of the two tanks will quickly reach equilibrium, and the solid xanthate in the atmospheric pressure feed tank will flow into the vacuum feed tank by gravity. (5) Close the second pneumatic valve and open the third pneumatic valve to connect the gas phase space of the vacuum feed tank with the gas phase space of the belt vacuum solid dryer. When the pressure is balanced, close the third pneumatic valve. (6) Open the first pneumatic valve and feed the material in the vacuum feed tank into the belt vacuum solid dryer; III. Continuous drying: (1) The solid xanthate raw material to be dried, which is evenly distributed on the belt of the belt vacuum solid dryer, is first indirectly heated by the heating plate, the solvent evaporates, and the material is dried. (2) Before discharge, the xanthate is indirectly heated by the cooling plate, and the material is cooled to avoid high-temperature spontaneous combustion; IV. Discharge: (1) After the solid xanthate is dried, the product is directly collected into the secondary receiving tank; (2) After the secondary receiving tank is full, close the fourth pneumatic valve; (3) The product enters the primary receiving tank; (4) Open the discharge pneumatic valve to discharge the material; (5) After the material is discharged, close the discharge pneumatic valve and then open the fifth pneumatic valve to connect the primary receiving tank and the secondary receiving tank to achieve pressure balance and prevent the material from generating dust due to pressure difference. After the pressure is balanced, close the fifth pneumatic valve. (6) Open the fourth pneumatic valve again to send the solid xanthate product into the secondary receiving tank; The key features and significant effects of this invention are as follows: 1. This invention solves the problem of continuous drying of solid xanthates; 2. This invention cools the continuously dried solid xanthate in a timely manner to prevent the risk of spontaneous combustion caused by high drying temperatures; 3. The feeding system of the belt vacuum solid dryer is equipped with an atmospheric pressure feeding tank, a vacuum feeding tank, and the first, second, and third pneumatic valves. This solves the technical problem that the material impacts the belt vacuum dryer and cannot fall smoothly onto the conveyor belt when feeding due to unbalanced air pressure. This ensures that the material is evenly distributed on the conveyor belt, which is crucial to the production efficiency and quality of the belt vacuum solid continuous dryer. 4. The discharge system of the belt vacuum solid continuous dryer is equipped with a combination of a primary receiving tank, a secondary receiving tank, and fourth and fifth pneumatic valves and a discharge pneumatic valve, which solves the technical problem of dust generated by material due to unbalanced air pressure affecting the belt correction of the belt vacuum solid continuous dryer. 5. This invention controls the pressure balance between feeding and discharging by controlling the timing of connecting the pneumatic valve, thus eliminating the risk caused by the previous reliance on pressure sensors for pressure detection when the pressure sensors malfunction. 6. This invention makes the drying process of xanthium continuous, closed, and automated, resulting in stable production, no clumping, no dust, and good product drying indicators, which greatly improves the production efficiency of enterprises. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; In the diagram: 1-Atmospheric pressure feed tank; 2-Second pneumatic valve; 3-Vacuum feed tank; 4-First pneumatic valve; 5-Third pneumatic valve; 6-Belt vacuum solid dryer; 7-Heating source; 8-Heating medium supply pipe; 9-Heating medium outlet pipe; 10-Chiller unit; 11-Cold water supply pipe; 12-Cold water return pipe; 13-Evaporation vapor phase outlet pipe; 14-Condenser; 15-Vacuum exhaust pipe; 16-Vacuum system; 17-Condensate discharge pipe; 18-Condensate receiving tank; 19-First stage receiving tank; 20-Fourth pneumatic valve; 21-Fifth pneumatic valve; 22-Second stage receiving tank; 23-Discharge pneumatic valve; 24-Heating plate; 25-Cooling plate; 26-Crawler track. Detailed Implementation

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings: The vacuum solid continuous drying apparatus for xanthate of the present invention comprises: (1) Feeding system: including atmospheric pressure feed tank 1; second pneumatic valve 2; vacuum feed tank 3; first pneumatic valve 4; third pneumatic valve 5; (2) The belt vacuum solid dryer 6 includes an internal heating plate 24; a cooling plate 25; and a conveyor belt 26; (3) Heating and cooling system: including heating source 7; heat medium supply pipe 8; heat medium outlet pipe 9; chiller unit 10; chilled water supply pipe 11; chilled water return pipe 12; (4) Vacuum system: including vapor phase outlet pipe 13; condenser 14; vacuum exhaust pipe 15; vacuum system 16; condensate discharge pipe 17; condensate receiving tank 18; (5) Discharge system: including primary receiving tank 19; fourth pneumatic valve 20; fifth pneumatic valve 21; secondary receiving tank 22; discharge pneumatic valve 23.

[0016] Atmospheric pressure feed tank 1 receives solid xanthate raw material to be dried from the upstream process. When it is necessary to feed into vacuum feed tank 3, the first pneumatic valve 4 is closed to disconnect vacuum feed tank 3 from the main equipment belt vacuum solid dryer 6, thereby disconnecting it from the vacuum system. Then, the second pneumatic valve 2 is opened to connect atmospheric pressure feed tank 1 and vacuum feed tank 3. The pressure quickly reaches equilibrium. At this time, the solid xanthate in atmospheric pressure feed tank 1 flows into vacuum feed tank 3 by gravity. Then, the second pneumatic valve 2 is closed and the third pneumatic valve 5 is opened to connect the gas phase space of vacuum feed tank 3 with the gas phase space of belt vacuum solid dryer 6. When the pressure reaches equilibrium, the third pneumatic valve 5 is closed and the first pneumatic valve 4 is opened to continue feeding into belt vacuum solid dryer 6. During the short period of time that the first pneumatic valve 4 is closed, the raw material buffered inside the pipe at the outlet of the first pneumatic valve 4 is used to achieve continuous feeding into belt vacuum solid dryer 6. During the above operations, the third pneumatic valve 5 plays a role in balancing the pressure. Its main purpose is to prevent the material from impacting the belt vacuum solid dryer 6 when it is fed into the dryer when the air pressure is unbalanced, which would cause the material to fall unevenly onto the conveyor belt 26. The pressure balance is controlled by the connection time of the pneumatic valve, eliminating the risk of pressure sensor failure when relying on pressure detection.

[0017] Each step in the above feeding process can have its opening or closing duration freely set, and can be controlled through the following timing control logic: Close the first pneumatic valve --> Open the second pneumatic valve --> Close the second pneumatic valve --> Open the third pneumatic valve --> Close the third pneumatic valve --> Open the first pneumatic valve.

[0018] After the solid xanthate is evenly distributed on the conveyor belt 26 of the belt vacuum solid dryer 6, it indirectly exchanges heat with the heating plate 24, the solvent is evaporated, and the material is dried. Before discharge, the xanthate indirectly exchanges heat with the cooling plate 25, and the material is cooled, avoiding the risk of spontaneous combustion caused by high temperature. The heating source 7 used in the system can be a hot water, steam, heat transfer oil, or other system. The heat source enters the belt vacuum solid dryer 7 through the heat medium inlet pipe 8 and returns to the heating source 7 after exiting through the heat medium outlet pipe 9. The chiller unit 10 used in the system can be an air-cooled or water-cooled system. The cold source enters the belt vacuum solid dryer 6 through the cold water inlet pipe 11 and returns to the chiller unit 10 after exiting through the cold water return pipe 12.

[0019] The evaporated vapor phase enters the condenser 14 through the vapor phase outlet pipe 13; the uncondensed tail gas is drawn into the vacuum system 16 through the vacuum tail gas pipe 15, and the condensed liquid enters the condensate receiving tank 18 through the condensate discharge pipe 17.

[0020] After the solid xanthate is dried, the product is directly collected into the secondary receiving tank 22. When the secondary receiving tank 22 is full, the fourth pneumatic valve 20 is closed, and the product enters the primary receiving tank 19. Then, the discharge pneumatic valve 23 below the secondary receiving tank 22 is opened to discharge the material. After discharge, the discharge pneumatic valve 23 is closed, and then the fifth pneumatic valve 21 is opened to connect the primary receiving tank 19 and the secondary receiving tank 22. After the pressure is balanced, the fourth pneumatic valve 20 is opened again to put the solid xanthate into the secondary receiving tank 22. During the above operation, the fifth pneumatic valve 21 plays a role in balancing the pressure. Its main purpose is to prevent dust from being generated by the material due to pressure difference when the air pressure is unbalanced. Dust will affect the operation of the internal track correction function of the belt vacuum solid dryer 6. The pressure balance is controlled by the connection time of the active valve, eliminating the risk of pressure sensor failure that may occur when relying on pressure detection in the past.

[0021] Each step in the above discharge process can have its opening or closing duration freely set, and can be controlled through the following timing control logic: Close the fourth pneumatic valve 20 --> Open the discharge pneumatic valve 23 --> Close the discharge pneumatic valve 23 --> Open the fifth pneumatic valve 21 --> Close the fifth pneumatic valve 21 --> Open the fourth pneumatic valve 20.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum solid continuous drying apparatus for xanthate, characterized in that: The belt vacuum solid dryer is the core component. Multiple conveyor belts are installed inside the dryer, relaying materials. Heating plates are installed on the inner sides of the belts closest to the feed line, while cooling plates are installed on the inner sides of the belts closest to the discharge line. The heating plates and cooling plates are connected to an external heating source and a cooling source, respectively. The upper feed inlet at one end of the belt vacuum solid dryer is connected to a vacuum feed tank via a first pneumatic valve. The top of the vacuum feed tank is then connected to an atmospheric pressure feed inlet via a second pneumatic valve. A third pneumatic valve is connected between the material tank, the vacuum feed tank, and the belt vacuum solid dryer; the lower outlet of the other end of the belt vacuum solid dryer is connected to a primary receiving tank, which is connected to a secondary receiving tank via a fourth pneumatic valve; a discharge pneumatic valve is installed at the bottom of the secondary receiving tank; a fifth pneumatic valve is also connected between the primary and secondary receiving tanks; the upper vapor phase outlet of the belt vacuum solid dryer is connected to one end of the condenser via a pipe, and the other end of the condenser is connected to the vacuum system via a vacuum exhaust pipe.

2. The vacuum solid continuous drying apparatus for xanthate according to claim 1, characterized in that: The heating plate is connected to the external heating source as follows: one end of the heating plate is connected to the heat medium supply pipe, the other end of the heating plate is connected to the heat medium outlet pipe, and both ends of the heating source are connected to the heat medium supply pipe and the heat medium outlet pipe, respectively.

3. The vacuum solid continuous drying apparatus for xanthate according to claim 1, characterized in that: The cooling plate is connected to the external cooling source as follows: one end of the cooling plate is connected to a cold water supply pipe, and the other end of the cooling plate is connected to a cold water return pipe. The two ends of the chiller unit are respectively connected to a cold water supply pipe and a cold water return pipe.

4. The vacuum solid continuous drying apparatus for xanthate according to claim 1, characterized in that: The heating source is a hot water system, a steam system, or a heat transfer oil system, and the chiller is an air-cooled system or a water-cooled unit.

5. A continuous vacuum solid drying process for xanthate based on the xanthate vacuum solid continuous drying apparatus of claim 1, characterized in that... include:

1. The vacuum system evacuates the belt vacuum solid dryer through the vacuum exhaust pipe, condenser, and evaporator vapor phase outlet pipe; II. Feeding: (1) The atmospheric pressure feed tank receives solid xanthate raw material to be dried from upstream; (2) When it is necessary to feed material into the vacuum feed tank, first close the first pneumatic valve to disconnect the vacuum feed tank from the belt vacuum solid dryer; (3) During the brief period of the first pneumatic valve being closed, the raw material is buffered inside the outlet pipe of the first pneumatic valve and connected to the belt vacuum solid dryer for feeding. (4) Open the second pneumatic valve to connect the atmospheric pressure feed tank and the vacuum feed tank. The pressure of the two tanks will quickly reach equilibrium, and the solid xanthate in the atmospheric pressure feed tank will flow into the vacuum feed tank by gravity. (5) Close the second pneumatic valve and open the third pneumatic valve to connect the gas phase space of the vacuum feed tank with the gas phase space of the belt vacuum solid dryer. When the pressure is balanced, close the third pneumatic valve. (6) Open the first pneumatic valve and feed the material in the vacuum feed tank into the belt vacuum solid dryer; III. Continuous drying: (1) The solid xanthate raw material to be dried, which is evenly distributed on the belt of the belt vacuum solid dryer, is first indirectly heated by the heating plate, the solvent evaporates, and the material is dried. (2) Before discharge, the xanthate is indirectly heated by the cooling plate, and the material is cooled to avoid high-temperature spontaneous combustion; IV. Discharge: (1) After the solid xanthate is dried, the product is directly collected into the secondary receiving tank; (2) After the secondary receiving tank is full, close the fourth pneumatic valve; (3) The product enters the primary receiving tank; (4) Open the discharge pneumatic valve to discharge the material; (5) After the material is discharged, close the discharge pneumatic valve and then open the fifth pneumatic valve to connect the primary receiving tank and the secondary receiving tank to achieve pressure balance and prevent the material from generating dust due to pressure difference. After the pressure is balanced, close the fifth pneumatic valve. (6) Open the fourth pneumatic valve again to put the solid xanthate product into the secondary receiving tank.

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