Pressurizing alkali dissolution device for precious metal-containing platinum alumina carrier

Abstract

The utility model relates to the field of precious metal secondary resource recovery, in particular to a pressurized alkali dissolution device for a precious metal-containing platinum alumina carrier. The pressurized alkali dissolution device comprises a reaction kettle (1), a vacuum pump (2), a dilution tank (3), an alkali liquor delivery pump (4), a metal filter (5), a buffer tank (6) and a control box (7), a material inlet valve (8), an alkali liquor inlet valve (9), a vacuum valve (10), a nitrogen inlet valve (11), a compressed air valve (12), a discharge valve (13), a stirring system A (14), an electromagnetic heating system (15), a coil water cooling system (16), a temperature transmitter A (17) and a pressure transmitter (18) are arranged on the reaction kettle (1). The device is simple to operate, and realizes the automatic control reaction and filtration of the precious metal-containing platinum alumina carrier.

Description

Technical Field

[0001] The utility model relates to the field of precious metal secondary resource recovery, in particular to a pressurized alkali dissolution device for an alumina carrier containing precious metal platinum. Background Art

[0002] Alumina catalysts containing precious metals are widely used in chemical production, and precious metal alumina carrier catalysts are often used in fixed bed catalysis. At present, most of the precious metal recycling companies in China use the alumina carrier full dissolution-ion exchange process to treat precious metal catalysts. The general process is: after incineration to remove organic matter, use sulfuric acid to dissolve the carrier, then add hydrochloric acid and oxidant to dissolve the precious metals, and the obtained solution is enriched with precious metals through resin adsorption. This process is relatively mature, and the platinum solution desorbed from the resin has a high purity, which is conducive to subsequent refining and purification. This process is also the most widely used method in China. However, the main problem with this process is the large amount of wastewater. One ton of failed catalyst produces about 15-20m³ of wastewater, with high acidity and high aluminum concentration. It is a mixed system of sulfuric acid and hydrochloric acid, and the comprehensive utilization of wastewater is difficult.

[0003] The basic principle of the pressurized alkali dissolution process is to use alkali to react with alumina to generate soluble aluminum salts, while platinum does not react. The platinum-containing sodium aluminate solution is filtered to filter out the insoluble slag containing platinum, so that platinum is enriched and convenient for subsequent refining and purification. Increasing the pressure can strengthen the reaction process, making the alumina dissolve faster and more thoroughly, and the content of precious metals in the filtered slag can be increased by more than 14 times. The wastewater generated after the solution is filtered is sodium aluminate solution, which can be used as an industrial water purifier to maximize the recycling of resources. Summary of the invention

[0004] The utility model aims to provide a pressurized alkali dissolution device for alumina carrier containing precious metal platinum, which is simple to operate and can realize automatic control reaction and filtration of alumina carrier containing precious metal platinum, thereby obtaining the required enriched slag containing precious metal platinum and sodium aluminate solution with usable value, and effectively solving the problem of insufficient full dissolution process of existing platinum-containing alumina carrier.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A pressurized alkali dissolution device for alumina carrier containing precious metal platinum, including: a reaction kettle, a vacuum pump, a dilution tank, an alkali solution delivery pump, a metal filter, a buffer tank, and a control box;

[0007] The reactor is equipped with material inlet valve, alkali solution inlet valve, vacuum valve, nitrogen inlet valve, compressed air valve, discharge valve, A stirring system, electromagnetic heating system, coil water cooling system, A temperature transmitter, and pressure transmitter;

[0008] The dilution tank is equipped with B stirring system, steam regulating system, liquid outlet valve and B temperature transmitter;

[0009] The metal filter is equipped with a drain valve;

[0010] The control box includes a start button and a controller;

[0011] The material inlet valve is connected to the material bin through a pipeline, the alkali liquid inlet valve is connected to the alkali liquid tank through a pipeline, the vacuum valve is connected to the vacuum pump through a pipeline, the nitrogen inlet valve is connected to the nitrogen bottle through a pipeline, the compressed air valve is connected to the gas storage tank through a pipeline, the discharge valve is connected to the dilution tank through a pipeline, the steam regulating system is connected to the steam pipe through a steam regulating valve, the liquid outlet valve is connected to the liquid inlet of the alkali liquid delivery pump through a pipeline, the liquid outlet of the alkali liquid delivery pump is connected to the liquid inlet of the metal filter through a pipeline, and the drain valve is connected to the buffer tank through a pipeline;

[0012] The start button, temperature transmitter A, pressure transmitter, and temperature transmitter B are connected to the controller through signal lines, and the controller is connected to the material inlet valve, alkali solution inlet valve, vacuum valve, nitrogen inlet valve, compressed air valve, discharge valve, A stirring system, electromagnetic heating system, coil water cooling system, B stirring system, steam regulating system, steam regulating valve, liquid outlet valve, and drain valve through control lines.

[0013] The alkali solution delivery pump is a pneumatic diaphragm pump.

[0014] The signal wire and the control wire are shielded wires, and the controller is a DCS host.

[0015] When working, the employee first puts the platinum-containing catalyst that has been pre-treated and decarbonized into the material bin, and then presses the start button, which transmits the signal to the controller; the controller first opens the material inlet valve, adds the material into the reactor, and then closes the material inlet valve; then opens the alkali solution inlet valve, adds the alkali solution prepared in a certain proportion into the reactor, and then closes the alkali solution inlet valve; then starts the vacuum pump and opens the vacuum valve to vacuum the reactor. When the pressure reaches a certain value, the pressure transmitter transmits the signal to the controller, and the controller slowly opens the nitrogen inlet valve, appropriately supplements nitrogen, and uses nitrogen to gradually bring out the oxygen in the reactor. After a certain period of time, when the oxygen content meets the process operating conditions, the vacuum pump is turned off and the vacuum valve is closed. Nitrogen is continued to be supplemented for a certain period of time until the nitrogen replacement operation is completed at normal pressure, and the nitrogen inlet valve is closed. Turn on the A stirring system and electromagnetic heating system, the reactor starts to heat up, the pressure in the reactor gradually increases, maintain a certain pressure in the reactor and control the stirring speed in the reactor. After a certain period of time, turn off the electromagnetic heating system, turn on the coil water cooling system, cool the materials in the reactor, and when cooled to a certain temperature, open the compressed air valve to add pressure to the reactor, then open the discharge valve, press the materials in the reactor to the dilution tank, turn off the A stirring system and close the discharge valve. Turn on the B stirring system and steam regulating valve, control the steam intake, and control the temperature in the tank to maintain the set temperature. After a certain period of time, turn off the B stirring system and steam regulating valve, open the liquid outlet valve, start the alkali liquid delivery pump to pump the liquid in the dilution tank to the metal filter for filtration, and open the drain valve. The filtrate enters the buffer tank, and finally the insoluble slag containing the precious metal platinum and the sodium aluminate solution are completely separated. Close the liquid outlet valve and the drain valve to complete an automatic reaction. Beneficial Effects

[0016] 1. The utility model is simple to operate and realizes automatic control reaction and filtration of alumina carrier containing precious metal platinum.

[0017] 2. Increasing the pressure of the reactor of the utility model can strengthen the reaction process between alkali and alumina, making the dissolution of alumina faster and more thorough, and the content of precious metals in the filter residue can be increased by more than 14 times.

[0018] 3. The signal line and control line of the utility model adopt shielded wires, which have a higher transmission rate and good anti-electromagnetic interference ability to ensure the safe operation of the reaction work.

[0019] 4. The controller of the utility model is a DCS host that can automatically control various devices with high control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a wiring diagram of the utility model.

[0021] 1-reactor, 2-vacuum pump, 3-dilution tank, 4-alkali solution delivery pump, 5-metal filter, 6-buffer tank, 7-control box, 8-material inlet valve, 9-alkali solution inlet valve, 10-vacuum valve, 11-nitrogen inlet valve, 12-compressed air valve, 13-discharge valve, 14-A stirring system, 15-electromagnetic heating system, 16-coil water cooling system, 17-A temperature transmitter, 18-pressure transmitter, 19-B stirring system, 20-steam regulation system, 21-liquid outlet valve, 22-B temperature transmitter, 23-drain valve, 24-start button, 25-controller. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, the pressurized alkali dissolution device of alumina carrier containing precious metal platinum comprises: a reaction kettle 1, a vacuum pump 2, a dilution tank 3, an alkali solution delivery pump 4, a metal filter 5, a buffer tank 6, and a control box 7;

[0023] The reactor 1 is provided with a material inlet valve 8, an alkali solution inlet valve 9, a vacuum valve 10, a nitrogen inlet valve 11, a compressed air valve 12, a discharge valve 13, a stirring system A 14, an electromagnetic heating system 15, a coil water cooling system 16, a temperature transmitter A 17, and a pressure transmitter 18;

[0024] The dilution tank 3 is provided with a B stirring system 19, a steam regulating system 20, a liquid outlet valve 21, and a B temperature transmitter 22;

[0025] The metal filter 5 is provided with a drain valve 23;

[0026] The control box 7 includes a start button 24 and a controller 25;

[0027] The material inlet valve 8 is connected to the material bin through a pipeline, the alkali liquid inlet valve 9 is connected to the alkali liquid tank through a pipeline, the vacuum valve 10 is connected to the vacuum pump 2 through a pipeline, the nitrogen inlet valve 11 is connected to the nitrogen bottle through a pipeline, the compressed air valve 12 is connected to the gas storage tank through a pipeline, the discharge valve 13 is connected to the dilution tank 3 through a pipeline, the steam regulating system 20 is connected to the steam pipe, the liquid outlet valve 21 is connected to the liquid inlet of the alkali liquid delivery pump 4 through a pipeline, the liquid outlet of the alkali liquid delivery pump 4 is connected to the liquid inlet of the metal filter 5 through a pipeline, and the drain valve 23 is connected to the buffer tank 6 through a pipeline;

[0028] A temperature transmitter 17, pressure transmitter 18, B temperature transmitter 22, start button 24 are connected to controller 25 through signal lines, and controller 25 is connected to material inlet valve 8, alkali liquid inlet valve 9, vacuum valve 10, nitrogen inlet valve 11, compressed air valve 12, discharge valve 13, A stirring system 14, electromagnetic heating system 15, coil water cooling system 16, B stirring system 19, steam regulation system 20, liquid outlet valve 21, and drain valve 23 through control lines.

[0029] The alkali solution delivery pump 4 is a pneumatic diaphragm pump.

[0030] The signal wire and the control wire are shielded wires, and the controller 25 is a DCS host.

[0031] When working, the employee first puts the platinum-containing catalyst that has been pre-treated and decarbonized into the material bin, and then presses the start button 24. The start button 24 transmits the signal to the controller 25; the controller 25 first opens the material inlet valve 8, adds the material into the reactor 1, and then closes the material inlet valve 8; then opens the alkali solution inlet valve 9, adds the alkali solution prepared in a certain proportion into the reactor 1, and then closes the alkali solution inlet valve 9; then starts the vacuum pump 2 and opens the vacuum valve 10, and vacuumizes the reactor 1. When the pressure reaches a certain value, the pressure transmitter 18 transmits the signal to the controller 25. The controller 25 slowly opens the nitrogen inlet valve 11, appropriately supplements nitrogen, and uses nitrogen to gradually bring out the oxygen in the reactor. After a certain period of time, when the oxygen content meets the process operating conditions, the vacuum pump 2 is turned off and the vacuum valve 10 is closed. Nitrogen is continuously supplemented for a certain period of time until the nitrogen replacement operation is completed at normal pressure, and the nitrogen inlet valve 11 is closed. The A stirring system 14 and the electromagnetic heating system 15 are turned on, the reactor 1 starts to heat up, the pressure in the reactor gradually increases, a certain pressure in the reactor is maintained and the stirring speed in the reactor is controlled. When the temperature reaches a certain value, the A temperature transmitter 17 transmits a signal to the controller 25, and the controller 25 turns off the electromagnetic heating system 15 and turns on the coil water cooling system 16 to cool the material in the reactor. When the temperature cools to a certain value, the A temperature transmitter 17 transmits a signal to the controller 25, and the controller 25 opens the compressed air valve 12 to add pressure to the reactor, and then opens the discharge valve 13 to press the material in the reactor to the dilution tank 3. After a certain period of time, the compressed air valve 12, the discharge valve 13, the A stirring system 14, and the coil water cooling system 16 are closed. The B stirring system 19 and the steam regulating system 20 are turned on to control the steam intake. When the temperature reaches a certain value, the B temperature transmitter 22 transmits a signal to the controller 25, and the controller 25 controls the temperature in the tank to maintain the set temperature. After a certain period of time, the B stirring system 19 and the steam regulating system 20 are closed, the liquid outlet valve 21 is opened, the alkali solution delivery pump 4 is started to pump the liquid in the dilution tank 3 to the metal filter 5 for filtration, and the drain valve 23 is opened. The filtrate enters the buffer tank 6, and finally the insoluble slag containing the precious metal platinum and the sodium aluminate solution are completely separated. The alkali solution delivery pump 4, the liquid outlet valve 21 and the drain valve 23 are closed to complete an automatic reaction work.

Claims

1. A pressurized alkali dissolution device for alumina carrier containing precious metal platinum, characterized in that: include: Reactor (1), vacuum pump (2), dilution tank (3), alkali solution delivery pump (4), metal filter (5), buffer tank (6), control box (7); The reaction kettle (1) is provided with a material inlet valve (8), an alkali solution inlet valve (9), a vacuum valve (10), a nitrogen inlet valve (11), a compressed air valve (12), a discharge valve (13), a stirring system (14), an electromagnetic heating system (15), a coil water cooling system (16), a temperature transmitter (17), and a pressure transmitter (18); The dilution tank (3) is provided with a B stirring system (19), a steam regulating system (20), a liquid outlet valve (21), and a B temperature transmitter (22); The metal filter (5) is provided with a drain valve (23); The control box (7) comprises a start button (24) and a controller (25); The material inlet valve (8) is connected to the material bin through a pipeline, the alkali liquid inlet valve (9) is connected to the alkali liquid tank through a pipeline, the vacuum valve (10) is connected to the vacuum pump (2) through a pipeline, the nitrogen inlet valve (11) is connected to the nitrogen bottle through a pipeline, the compressed air valve (12) is connected to the gas storage tank through a pipeline, the discharge valve (13) is connected to the dilution tank (3) through a pipeline, the steam regulating system (20) is connected to the steam pipe, the liquid outlet valve (21) is connected to the liquid inlet of the alkali liquid delivery pump (4) through a pipeline, the liquid outlet of the alkali liquid delivery pump (4) is connected to the liquid inlet of the metal filter (5) through a pipeline, and the discharge valve (23) is connected to the buffer tank (6) through a pipeline; The A temperature transmitter (17), the pressure transmitter (18), the B temperature transmitter (22), and the start button (24) are connected to the controller (25) through signal lines. The controller (25) is connected to the material inlet valve (8), the alkali solution inlet valve (9), the vacuum valve (10), the nitrogen inlet valve (11), the compressed air valve (12), the discharge valve (13), the A stirring system (14), the electromagnetic heating system (15), the coil water cooling system (16), the B stirring system (19), the steam regulating system (20), the liquid outlet valve (21), and the drain valve (23) through control lines.

2. The pressurized alkali dissolution device for alumina carrier containing precious metal platinum according to claim 1, characterized in that: The alkali solution delivery pump (4) is a pneumatic diaphragm pump.

3. The pressurized alkali dissolution device for alumina carrier containing precious metal platinum according to claim 1 or 2, characterized in that: The signal line and the control line are shielded lines, and the controller (25) is a DCS host.

Images