Precious metal-containing slurry enrichment device

Abstract

The utility model discloses a precious metal-containing slurry enrichment device which comprises an evaporation device, a condensation device and a negative pressure device, the evaporation device is connected with the condensation device, the condensation device is connected with the negative pressure device, and the precious metal-containing slurry enrichment device further comprises a protection device which is connected with the evaporation device and prevents precious metal from being oxidized and spontaneously combusted. The precious metal-containing slurry is heated in the evaporation device, and precious metal enrichment is realized through solvent distillation transfer. The device can avoid oxidation spontaneous combustion of precious metal separated from a solvent, effectively improves the production safety of precious metal enrichment, and is convenient for further purification and recovery; and the enrichment efficiency is improved through the negative pressure device, and the gas pollution of the organic reagent is reduced through the condensing device.

Description

Technical Field

[0001] The utility model relates to a slurry enrichment device, in particular to a slurry enrichment device containing precious metals. Background Art

[0002] Precious metal catalysts are precious metal materials that can change the speed of chemical reactions. They have excellent catalytic activity and selectivity and are widely used in environmental protection (automobile exhaust purification, catalytic combustion of organic matter, etc.), fine chemicals (pharmaceutical chemicals, new chemical materials, etc.), new energy (hydrogen fuel cells, electrolysis of water, etc.) and basic chemicals. Precious metal catalysts mainly use platinum group metals (platinum, palladium, ruthenium, rhodium, iridium, etc.) as catalytic active components. During the reaction, they will not be complexed with the raw materials, but will be dissolved in the solvent to form a uniformly dispersed slurry. Solvents containing precious metal slurries include water and organic solvents, such as tetrahydrofuran, methanol, toluene, chloroform, etc. After the reaction is completed or the catalyst is deactivated, it becomes a waste liquid containing precious metals. Due to the limited reserves, low output and high price of precious metals, this waste liquid should not be directly discarded. Enriching and recovering the precious metals in it is a wise choice to reduce the economic burden of enterprises and avoid waste of resources.

[0003] Distillation concentration is a commonly used method for slurry enrichment, which separates and purifies the target material according to the difference in volatility of each component in the solution. The precious metal recovery industry uses this method to enrich and pre-treat precious metal slurries. For example, CN102794025A discloses a concentration and recovery device for industrial electroplating wastewater, including a heating separation system, a water condenser, a liquid condenser, a liquid collecting tank and a distilled water collecting tank, which can effectively recover the precious metal components in the electroplating wastewater. However, in actual applications, there are certain safety hazards in enriching precious metals by distilling solvents: during high-temperature distillation, the volatilization of liquids into gases will increase the system pressure; most of the organic solvents in precious metal slurries are flammable and explosive hazardous chemicals; at the same time, since most precious metal materials have strong oxidation properties, they are easily exposed to air after being separated from the solvent, resulting in oxidation, and there is a risk of spontaneous combustion. Summary of the invention

[0004] Purpose of the utility model: to provide a safe and efficient device for enriching slurry containing precious metals.

[0005] Technical solution: The utility model provides a device for enriching slurry containing precious metals, including an evaporation device, a condensation device and a negative pressure device. The evaporation device is connected to the condensation device, and the condensation device is connected to the negative pressure device. The device for enriching slurry containing precious metals also includes a protection device connected to the evaporation device to prevent the precious metals from oxidizing and spontaneously combusting. The precious metal slurry is heated in the evaporation device, and the solvent evaporates into a gaseous state and enters the condensation device, and then changes back to a liquid state after heat exchange; the negative pressure device puts the system in a negative pressure state, thereby improving the solvent recovery efficiency; the protection device is arranged on the evaporation device to avoid safety problems such as oxidation and spontaneous combustion of the precious metals enriched as the solvent evaporates.

[0006] Preferably, the protection device comprises an inert gas inlet for introducing inert gas into the evaporation device, so as to replace the air in the evaporation device with the inert gas to reduce the risk of spontaneous combustion. The inert gas comprises nitrogen.

[0007] Preferably, the protection device comprises a water inlet for spraying water into the evaporation device, thereby cooling the enriched product by spraying to avoid overheating.

[0008] Preferably, the protection device comprises a pressure sensor capable of measuring the pressure in the evaporation device, so as to facilitate monitoring of the system pressure when the device is running.

[0009] Preferably, the protective device includes a visible window for confirming the enrichment of the slurry in the evaporation device, so as to directly observe the state of the slurry.

[0010] Preferably, it also includes a transfer device connected to the evaporation device and capable of transferring the precious metals in the evaporation device, so as to facilitate the removal of the enriched precious metals.

[0011] Preferably, the transfer device is a movable bracket that can tilt the evaporation device to discharge materials. After the enrichment is completed, the movable bracket is adjusted to tilt the evaporation device to facilitate the removal of precious metals.

[0012] Preferably, the transfer device is an inner liner bag placed inside the evaporation device to prevent the slurry from directly contacting the evaporation device. The high temperature and corrosion resistant inner liner bag is placed inside the evaporation device, and the slurry is heated and distilled in the inner liner bag. After the enrichment is completed, the precious metals are retained in the inner liner bag and can be taken out together with the inner liner bag.

[0013] Preferably, the negative pressure device comprises a negative pressure storage tank and a vacuum pump, wherein the pump is arranged in the negative pressure storage tank, and a feed valve is arranged between the condensing device and the negative pressure storage tank. Opening the feed valve can transfer the liquid obtained by distillation and concentration and store it in the negative pressure storage tank.

[0014] Preferably, the parts of the device that are in direct contact with the slurry are treated with anti-corrosion to improve safety and extend service life.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. It can prevent the oxidation and spontaneous combustion of precious metals separated from the solvent, effectively improving the production safety of precious metal enrichment. 2. The enrichment efficiency is improved through the negative pressure device, and the gas pollution of the organic reagent is reduced through the condensation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings. Example

[0018] As shown in the attached drawings, a device for enriching slurry containing precious metals includes an inert gas inlet 1, a heating kettle 3, a liner bag, a heat exchanger 10 and a negative pressure device. The inert gas inlet 1 is arranged on the heating kettle 3, and the liner bag is laid in the heating kettle; the heating kettle 3 is connected to the heat exchanger 10, and the heat exchanger 10 is connected to the negative pressure device.

[0019] The precious metal slurry is placed in the heating kettle 3, heated to evaporate the solvent in the precious metal slurry, and the evaporated gas meets the heat exchanger 10 and condenses into liquid. The negative pressure device puts the system in a negative pressure state. After the solvent is completely distilled out, the heating kettle 3 stops heating, and the air in the heating kettle 3 is replaced with nitrogen through the inert gas inlet 1. After cooling to room temperature, the liner bag is taken out and the enriched precious metal is transferred therein. Example

[0020] As shown in the attached drawings, a device for enriching slurry containing precious metals comprises an inert gas inlet 1, a water inlet 2, a heating kettle 3, a movable bracket 4, a visible window 5, a pressure sensor 6, a safety valve 7, a pressure display 8, a feed diaphragm pump 9, a heat exchanger 10, a temperature controller 11, a vacuum feed valve 12, a diaphragm pump 13, a negative pressure storage tank 14, a discharge valve 15 and an emptying valve 16. The inert gas inlet 1, the water inlet 2, the visible window 5, the pressure sensor 6, the safety valve 7 and the pressure display 8 are all arranged on the heating kettle 3, and the heating kettle 3 is arranged on the movable bracket 4; the heating kettle 3 is connected to the heat exchanger 10, and the heat exchanger 10 is connected to the negative pressure storage tank 14 through the vacuum feed valve 12; the diaphragm pump 13 is arranged inside the negative pressure storage tank 14, the discharge valve 15 is arranged at the lower part of the negative pressure storage tank 14, and the emptying valve 16 is arranged at the bottom of the negative pressure storage tank 14.

[0021] The precious metal slurry is introduced into the heating kettle 3 through the feed diaphragm pump 9, and the heating kettle 3 is kept at a suitable distillation temperature by the temperature controller 11, and the solvent in the precious metal slurry is evaporated. The gas generated by the evaporation meets the heat exchanger 10 and condenses into liquid; the negative pressure storage tank 14 is evacuated to -0.02 - 0 MPa by the diaphragm pump 13, and the vacuum feed valve 12 is opened to allow the condensate to enter the negative pressure storage tank 14; the enrichment of precious metals in the heating kettle 3 is confirmed through the visible window 5, and the heating kettle 3 is stopped by the temperature controller 11 after the solvent in the slurry is completely distilled out; the inert gas inlet 1 is opened to replace the air in the heating kettle 3 with nitrogen; after the heating kettle 3 is cooled to room temperature, the heating kettle 3 is tilted by the movable bracket 4 to transfer the enriched precious metals therein; the discharge valve 15 and the emptying valve 16 are opened to transfer the distilled solvent. When the material in the heating kettle 3 is found to be oxidized and spontaneously combusted through the visible window 5, the water inlet 2 is opened for spraying. When the pressure display 8 indicates that the system is over-pressured, the temperature controller 11 is turned off and the safety valve 7 is opened to prevent accidents caused by excessive pressure; the pressure display range of the pressure sensor 6 and the pressure digital display 8 is 0-0.5 MPa, the pressure level of the safety valve 7 is 0.04-0.1 MPa, and the set pressure is 0.04 MPa.

Claims

1. A device for enriching a slurry containing precious metals, comprising an evaporation device, a condensation device and a negative pressure device, wherein the evaporation device is connected to the condensation device, and the condensation device is connected to the negative pressure device, characterized in that: It also includes a protection device connected to the evaporation device to prevent the precious metal from oxidizing and spontaneously combusting.

2. The device for enriching precious metal slurry according to claim 1, characterized in that: The protection device comprises an inert gas inlet (1) for introducing inert gas into the evaporation device.

3. The device for enriching precious metal slurry according to claim 1, characterized in that: The protective device comprises a water inlet (2) capable of spraying water into the evaporation device.

4. The device for enriching precious metal slurry according to claim 1, characterized in that: The protection device comprises a pressure sensor (6) capable of measuring the pressure in the evaporation device.

5. The device for enriching precious metal slurry according to claim 1, characterized in that: The protective device comprises a visible window (5) for confirming the condition of the slurry in the evaporation device.

6. The device for enriching precious metal slurry according to claim 1, characterized in that: Also included is a transfer device connected to the evaporation device and capable of transferring the precious metal in the evaporation device.

7. The device for enriching the precious metal slurry according to claim 6, characterized in that: The transfer device is a movable bracket (4) capable of enabling the evaporation device to discharge materials at an angle.

8. The device for enriching precious metal slurry according to claim 6, characterized in that: The transfer device is an inner liner bag placed inside the evaporation device to prevent the slurry from directly contacting the evaporation device.

9. The device for enriching precious metal slurry according to claim 1, characterized in that: The negative pressure device comprises a negative pressure storage tank (14) and a vacuum pump (13); the pump (13) is arranged in the negative pressure storage tank (14); and a feed valve (12) is arranged between the condensing device and the negative pressure storage tank (14).

10. The device for enriching precious metal slurry according to claim 1, characterized in that: The parts of the device that are in direct contact with the slurry are all treated with anti-corrosion.

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