Cyclic cleaning and recycling system and method for waste aluminum oxide of carclazyte bed

Abstract

The invention provides a carclazyte bed waste aluminum oxide circulating cleaning and recycling system and method, relates to the technical field, and solves the problems that an existing carclazyte bed only has an aromatic hydrocarbon feeding pipeline and is not provided with a discharging pipeline, and the aromatic hydrocarbon circulating cleaning effect cannot be achieved. The device comprises a carclazyte bed, a working liquid storage tank, a preparation kettle and a waste aromatic hydrocarbon storage tank, the bottom of the carclazyte bed is connected with a waste liquid discharge pipe, the waste liquid discharge pipe is connected with the inlet ends of a waste liquid cooler, an oil separation tank and a material pressing filter in a split-flow mode, and the outlet end of the material pressing filter is connected with the inlet end of the working liquid storage tank. The outlet end of the waste aromatic hydrocarbon storage tank is connected with the inlet ends of the working liquid storage tank and the configuration kettle through a third working pump in a shunting manner, the outlet end of the working liquid storage tank is connected with the inlet end of the configuration kettle through a first working pump, and the outlet end of the configuration kettle is connected with a waste liquid discharge pipe through a second working pump. The method has the beneficial effects that the effect of fully recycling effective auxiliary materials in the waste aluminum oxide is achieved, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of process intensification, and in particular to a system and method for recycling waste aluminum oxide from a clay bed. Background Art

[0002] At present, the bleaching clay bed device produces 900,000 tons of hydrogen peroxide annually. Calculated at 2.5kg / ton of alumina, 2,250 tons of alumina are consumed annually. Each ton of waste alumina contains more than 0.03 tons of recyclable anthraquinone effective auxiliary materials, and about 67.5 tons of 2-ethylanthraquinone can be recovered annually, which has a very high recovery value, but is not fully recovered. Currently, the bleaching clay bed only has an aromatics feed pipeline, but no aromatics discharge circulation and cleaning pipeline, making it impossible to achieve the effect of hot aromatics circulating to clean the waste alumina, and unable to fully recover the 2-ethylanthraquinone in the waste alumina. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem that the existing clay bed has only an aromatic hydrocarbon feed pipeline but no discharge pipeline, and thus cannot achieve the effect of circulating cleaning of the aromatic hydrocarbon.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A bleaching clay bed waste alumina circulation cleaning and recovery system, characterized by comprising a bleaching clay bed, a working fluid storage tank, a configuration kettle, and a waste aromatics storage tank;

[0006] A working fluid inlet pipe is connected to one side of the bottom of the clay bed, a nitrogen inlet pipe, a low-pressure steam inlet pipe and a working fluid drain pipe are connected above the clay bed respectively, the outlet end of the working fluid drain pipe is connected to the inlet end of the configuration kettle, a waste liquid discharge pipe is connected to the bottom of the clay bed, the waste liquid discharge pipe is connected in a shunt to the inlet end of the waste liquid cooler, the oil separator and the pressure filter, the outlet end of the waste liquid cooler is connected to the inlet end of the oil separator, and the outlet end of the pressure filter is connected to the inlet end of the working fluid storage tank;

[0007] The upper inlet end of the waste aromatics storage tank is connected to a waste aromatics inlet pipe for introducing aromatics and condensate recovered from the system, and the outlet end of the waste aromatics storage tank is connected to the working liquid storage tank and the inlet end of the configuration kettle through a third working pump.

[0008] The outlet of the working liquid storage tank is connected to the inlet of the configuration kettle through a first working pump, and the outlet of the configuration kettle is connected to the waste liquid discharge pipe through a second working pump.

[0009] A further improvement is that the nitrogen inlet pipe is connected to the external nitrogen main pipe for pressurizing the clay bed, and the low-pressure steam inlet pipe is connected to the external low-pressure steam equipment for steam heating and cooking the clay bed. The nitrogen inlet pipe and the low-pressure steam inlet pipe are both connected to corresponding control valves and flow meters.

[0010] A further improvement is that the working fluid inlet pipe is connected to a working fluid heater for heating the working fluid fed into the clay bed, and the working fluid inlet pipe is connected to a corresponding control valve and flow meter.

[0011] A further improvement is that: a heat exchanger is connected to the working fluid drain pipe, and a corresponding control valve and flow meter are connected to the working fluid drain pipe.

[0012] A further improvement is that the waste liquid discharge pipe is connected to a corresponding control valve and flow meter.

[0013] Further improvement is that the volume of the working fluid storage tank is 230-335m 3 .

[0014] A further improvement is that a stirrer is provided in the configuration kettle.

[0015] A further improvement is that the working fluid storage tank is provided with an interface meter.

[0016] A further improvement is that each pipeline in the system is connected with a corresponding control valve.

[0017] A method for recycling, cleaning and recovering waste aluminum oxide from a clay bed, using the above system, is characterized by comprising the following steps:

[0018] S1 system first presses the material → S2 steam heating and boiling → S3 hot aromatics soaking and circulating cleaning → S4 aromatics discharge system → S5 steam heating and boiling → S6 water soaking and cooling → S7 system drainage;

[0019] S1. System pressing: Close the outlet valve of the clay bed, introduce nitrogen through the nitrogen main pipe, and use nitrogen to press the material inside the clay bed into the system;

[0020] S2. Steam cooking: The other pipelines of the clay bed are closed, the low-pressure steam inlet pipe is changed to pass, the circulating water of the waste liquid cooler is put into use, the process of the clay bed, waste liquid cooler and grease trap is opened, the steam pressure of the clay bed is maintained at 0.10-0.20MPaG, and the waste alumina is steam purged for 10-12 hours;

[0021] S3, hot aromatics soaking circulation cleaning: open the working liquid storage tank, the first working pump, and the concentration preparation kettle process, transfer the waste aromatics in the working liquid storage tank to the preparation kettle for separation, drainage, and analysis of the hydrogen peroxide content, then heat the waste aromatics in the preparation kettle to 45-50 ° C by steam, open the process of the preparation kettle and the bleaching clay bed, start the second working pump of the preparation kettle to transfer the heated waste aromatics into the bleaching clay bed, and perform hot aromatics circulation cleaning for 6-8 hours;

[0022] S4, Aromatics discharge system: After the thermal cycle of the waste aromatics in the clay bed is completed, the clay bed and the concentration kettle process are opened, and nitrogen is used to press the waste aromatics inside the clay bed into the configuration kettle. The waste aromatics are then cleaned and transferred to the system;

[0023] S5. Steam heating and cooking: open the clay bed, waste liquid cooler, and grease trap process, maintain the steam pressure of the clay bed at 0.10-0.20 MPaG, and steam purge the waste alumina for 6-8 hours;

[0024] S6, adding water for soaking and cooling: After steam cooking is completed, the working liquid storage tank, the first working pump, and the concentration preparation kettle process are opened, and the system wastewater temporarily stored in the working liquid storage tank of the device is transferred to the preparation kettle for separation and analysis of the hydrogen peroxide content. The process of the preparation kettle and the bleaching clay bed is opened, and the second working pump of the preparation kettle is started to transfer the wastewater in the preparation kettle into the bleaching clay bed until the waste alumina is completely soaked with the wastewater. The soaking time is 8-10 hours;

[0025] S7. System drainage: After the soaking of waste alumina is completed, the clay bed and grease trap process are opened up, and the wastewater inside the clay bed is discharged into the grease trap.

[0026] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0027] 2-Ethylanthraquinone and other effective auxiliary materials are adsorbed in the pores of waste alumina. Taking advantage of the fact that 2-ethylanthraquinone is easily soluble in aromatic hydrocarbons, through the heating function of the preparation and the circulation cleaning of the working pump, hot aromatic hydrocarbons are used to circulate and clean the waste alumina, dissolve the effective auxiliary materials in its pores, and better recover the effective auxiliary materials in the waste alumina in the white clay bed, so as to fully recover the effective auxiliary materials in the waste alumina and achieve the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 or the description of the prior art. 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.

[0029] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0030] Explanation of the accompanying symbols: white clay bed 1, nitrogen inlet pipe 2, low-pressure steam inlet pipe 3, working fluid inlet pipe 4, waste liquid discharge pipe 5, waste liquid cooler 6, oil separator 7, press filter 8, working fluid storage tank 9, working fluid emptying pipe 10, first working pump 11, configuration kettle 12, second working pump 13, waste aromatics storage tank 14, third working pump 15. DETAILED DESCRIPTION

[0031] See Figure 1 As shown, the technical solution adopted in this specific embodiment is: a bleaching clay bed waste alumina circulation cleaning and recovery system, including a bleaching clay bed 1, a working liquid storage tank 9, a configuration kettle 12, and a waste aromatics storage tank 14;

[0032] A working fluid inlet pipe 4 is connected to one side of the bottom of the clay bed 1, and a nitrogen inlet pipe 2, a low-pressure steam inlet pipe 3 and a working fluid drain pipe 10 are connected above the clay bed 1 respectively. The outlet end of the working fluid drain pipe 10 is connected to the inlet end of the configuration kettle 12. A waste liquid discharge pipe 5 is connected to the bottom of the clay bed 1, and the waste liquid discharge pipe 5 is connected in a branch manner to the inlet ends of a waste liquid cooler 6, a grease trap 7 and a press filter 8. The outlet end of the waste liquid cooler 6 is connected to the inlet end of the grease trap 7, and the outlet end of the press filter 8 is connected to the inlet end of a working fluid storage tank 9;

[0033] The upper inlet end of the waste aromatics storage tank 14 is connected to a waste aromatics inlet pipe for introducing aromatics and condensate recovered from the system. The outlet end of the waste aromatics storage tank 14 is connected to the working liquid storage tank 9 and the inlet end of the configuration kettle 12 through a third working pump 15.

[0034] The outlet of the working liquid storage tank 9 is connected to the inlet of the configuration kettle 12 via a first working pump 11 , and the outlet of the configuration kettle 12 is connected to the waste liquid discharge pipe 5 via a second working pump 13 .

[0035] Among them, the nitrogen inlet pipe 2 is connected to the external nitrogen main pipe for pressurizing the clay bed 1, and the low-pressure steam inlet pipe 3 is connected to the external low-pressure steam equipment for steam heating and cooking the clay bed 1. The nitrogen inlet pipe 2 and the low-pressure steam inlet pipe 3 are both connected with corresponding control valves and flow meters.

[0036] The working fluid inlet pipe 4 is connected to a working fluid heater for heating the working fluid fed into the clay bed 1 , and the working fluid inlet pipe 4 is connected to a corresponding control valve and flow meter.

[0037] The working fluid drain pipe 10 is connected to a heat exchanger, and the working fluid drain pipe 10 is connected to a corresponding control valve and a flow meter.

[0038] Wherein, the waste liquid discharge pipe 5 is connected to a corresponding control valve and flow meter.

[0039] The total volume of the working fluid storage tank 9 is 230-335m 3 .

[0040] Wherein, a stirrer is provided in the configuration kettle 12.

[0041] Wherein, the working fluid storage tank 9 is provided with an interface meter.

[0042] Among them, each pipeline in the system is connected with a corresponding control valve.

[0043] A method for recycling, cleaning and recovering waste aluminum oxide from a clay bed, using the above system, comprises the following steps:

[0044] S1 system first presses the material → S2 steam heating and boiling → S3 hot aromatics soaking and circulating cleaning → S4 aromatics discharge system → S5 steam heating and boiling → S6 water soaking and cooling → S7 system drainage;

[0045] S1, system pressing: close the outlet valve of the clay bed 1, introduce nitrogen through the nitrogen main pipe 2, and use nitrogen to press the material inside the clay bed 1 into the system;

[0046] S2, steam cooking: the other pipelines of the clay bed 1 are closed, the low-pressure steam inlet pipe 3 is changed to pass, the circulating water of the waste liquid cooler 6 is put into use, the process of the clay bed 1, the waste liquid cooler 6, and the grease trap 7 is opened, the steam pressure of the clay bed 1 is maintained at 0.10-0.20 MPaG, and the waste alumina is steam purged for 10-12 hours;

[0047] S3, hot aromatics soaking circulation cleaning: open the working liquid storage tank 14, the first working pump 11, and the concentration configuration kettle 12 process, transfer the waste aromatics inside the working liquid storage tank 14 to the preparation kettle 12 for separation, drainage, and analysis of the hydrogen peroxide content, and then heat the waste aromatics inside the preparation kettle 12 to 45-50 ° C by steam, open the configuration kettle 12 and the bleaching clay bed 1 process, start the second working pump 13 of the preparation kettle 12 to transfer the heated waste aromatics into the bleaching clay bed 1, and perform hot aromatics circulation cleaning for 6-8 hours;

[0048] S4, aromatics discharge system: After the thermal cycle of the waste aromatics in the clay bed 1 is completed, the clay bed 1 and the concentration configuration kettle 12 process are opened, and nitrogen is used to press the waste aromatics inside the clay bed 1 into the configuration kettle 12, and then the waste aromatics are cleaned and transferred to the system;

[0049] S5, steam heating and cooking: open the process of clay bed 1, waste liquid cooler 6, and grease trap 7, maintain the steam pressure of clay bed 1 at 0.10-0.20 MPaG, and steam purge the waste alumina for 6-8 hours;

[0050] S6, adding water for soaking and cooling: After the steam cooking is completed, the working liquid storage tank 9, the first working pump 11, and the concentration preparation kettle 12 are opened, and the system wastewater temporarily stored in the working liquid storage tank 9 of the device is transferred to the preparation kettle 12 for separation and analysis of the hydrogen peroxide content. The preparation kettle 12 and the bleaching clay bed 1 are opened, and the second working pump 13 of the preparation kettle 12 is started to transfer the wastewater in the preparation kettle 12 into the bleaching clay bed 1 until the wastewater is completely soaked with the waste alumina. The soaking time is 8-10 hours;

[0051] S7, system drainage: After the soaking of waste alumina is completed, the process of white clay bed 1 and grease trap 7 is opened to drain the wastewater inside the white clay bed into the grease trap.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention as claimed. The scope of protection claimed is defined by the appended claims and their equivalents. Any details not described in detail herein are well known to those skilled in the art.

Claims

1. A system for recycling, cleaning and recovering spent aluminum oxide from a clay bed, characterized by: Including clay bed, working fluid storage tank, configuration kettle, and waste aromatics storage tank; A working fluid inlet pipe is connected to one side of the bottom of the clay bed, a nitrogen inlet pipe, a low-pressure steam inlet pipe and a working fluid drain pipe are connected above the clay bed respectively, the outlet end of the working fluid drain pipe is connected to the inlet end of the configuration kettle, a waste liquid discharge pipe is connected to the bottom of the clay bed, the waste liquid discharge pipe is connected in a shunt to the inlet end of the waste liquid cooler, the oil separator and the pressure filter, the outlet end of the waste liquid cooler is connected to the inlet end of the oil separator, and the outlet end of the pressure filter is connected to the inlet end of the working fluid storage tank; The upper inlet end of the waste aromatics storage tank is connected to a waste aromatics inlet pipe for introducing aromatics and condensate recovered from the system, and the outlet end of the waste aromatics storage tank is connected to the working liquid storage tank and the inlet end of the configuration kettle through a third working pump. The outlet of the working liquid storage tank is connected to the inlet of the configuration kettle through a first working pump, and the outlet of the configuration kettle is connected to the waste liquid discharge pipe through a second working pump.

2. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The nitrogen inlet pipe is connected to the external nitrogen main pipe for pressurizing the clay bed, and the low-pressure steam inlet pipe is connected to the external low-pressure steam equipment for steam heating and cooking the clay bed. The nitrogen inlet pipe and the low-pressure steam inlet pipe are both connected to corresponding control valves and flow meters.

3. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The working fluid inlet pipe is connected to a working fluid heater for heating the working fluid fed into the clay bed, and the working fluid inlet pipe is connected to a corresponding control valve and flow meter.

4. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The working fluid drain pipe is connected to a heat exchanger, and the working fluid drain pipe is connected to a corresponding control valve and a flow meter.

5. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The waste liquid discharge pipe is connected with a corresponding control valve and flow meter.

6. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The volume of the working fluid storage tank is 230-335m 3 .

7. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: A stirrer is provided in the configuration kettle.

8. The system for recycling, cleaning and recovering waste aluminum oxide from a clay bed according to claim 1, characterized in that: The working fluid storage tank is provided with an interface meter.

9. A method for recycling and cleaning waste aluminum oxide from a clay bed, using a recycling and cleaning waste aluminum oxide recycling system according to claims 1-8, characterized in that: The following steps are involved: S1. System pressing: Close the outlet valve of the clay bed, introduce nitrogen through the nitrogen main pipe, and use nitrogen to press the material inside the clay bed into the system; S2. Steam cooking: The other pipelines of the clay bed are closed, the low-pressure steam inlet pipe is changed to pass, the circulating water of the waste liquid cooler is put into use, the process of the clay bed, waste liquid cooler and grease trap is opened, the steam pressure of the clay bed is maintained at 0.10-0.20MPaG, and the waste alumina is steam purged for 10-12 hours; S3, hot aromatics soaking circulation cleaning: open the working liquid storage tank, the first working pump, and the concentration preparation kettle process, transfer the waste aromatics in the working liquid storage tank to the preparation kettle for separation, drainage, and analysis of the hydrogen peroxide content, then heat the waste aromatics in the preparation kettle to 45-50 ° C by steam, open the process of the preparation kettle and the bleaching clay bed, start the second working pump of the preparation kettle to transfer the heated waste aromatics into the bleaching clay bed, and perform hot aromatics circulation cleaning for 6-8 hours; S4, Aromatics discharge system: After the thermal cycle of the waste aromatics in the clay bed is completed, the clay bed and the concentration kettle process are opened, and nitrogen is used to press the waste aromatics inside the clay bed into the configuration kettle. The waste aromatics are then cleaned and transferred to the system; S5. Steam heating and cooking: open the clay bed, waste liquid cooler, and grease trap process, maintain the steam pressure of the clay bed at 0.10-0.20 MPaG, and steam purge the waste alumina for 6-8 hours; S6, adding water for soaking and cooling: After steam cooking is completed, the working liquid storage tank, the first working pump, and the concentration preparation kettle process are opened, and the system wastewater temporarily stored in the working liquid storage tank of the device is transferred to the preparation kettle for separation and analysis of the hydrogen peroxide content. The process of the preparation kettle and the bleaching clay bed is opened, and the second working pump of the preparation kettle is started to transfer the wastewater in the preparation kettle into the bleaching clay bed until the waste alumina is completely soaked with the wastewater. The soaking time is 8-10 hours; S7. System drainage: After the soaking of waste alumina is completed, the clay bed and grease trap process are opened up, and the wastewater inside the clay bed is discharged into the grease trap.

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