CN106861581B - Device for recovering nitrogen element in aluminum ash - Google Patents

Device for recovering nitrogen element in aluminum ash Download PDF

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Publication number
CN106861581B
CN106861581B CN201710104286.1A CN201710104286A CN106861581B CN 106861581 B CN106861581 B CN 106861581B CN 201710104286 A CN201710104286 A CN 201710104286A CN 106861581 B CN106861581 B CN 106861581B
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shell
filter
reaction kettle
plane
wall
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CN106861581A (en
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倪红军
倪威
胡妙关
吕帅帅
汪兴兴
朱昱
黄明宇
胡永胜
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Nantong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/28—Methods of preparing ammonium salts in general

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The application discloses device for recovering nitrogen elements in aluminum ash, which comprises a reaction kettle and an absorption tower, wherein the reaction kettle is communicated with the absorption tower through a pipeline for collecting ammonia.

Description

Device for recovering nitrogen element in aluminum ash
Technical Field
The present disclosure relates generally to elemental nitrogen recovery devices, and more particularly to devices for recovering elemental nitrogen from aluminous ash.
Background
The aluminum ash (aluminum ash/aluminum slag) is a common waste in the aluminum industry, has a huge yield, and is mainly derived from infusible inclusions, oxides, additives floating on the surface of an aluminum melt in the production process of smelting aluminum and aluminum alloy, reaction products generated by physical and chemical reactions with the additives and the like, and is generated in all production processes of melting aluminum.
In the smelting process of aluminum, nitrogen is generally filled into a smelting furnace to accelerate purification, part of nitrogen is absorbed by aluminum ash floating on the surface of aluminum water during evaporation, so the aluminum ash contains nitrogen, and aluminum nitride generates ammonia when meeting water and is volatile when being heated, so the aluminum ash has strong ammonia smell after being wetted, and brings great trouble to environmental stability and personnel health for a long time.
At present, aiming at the problems that a plurality of utilization methods of nitrogen elements in the aluminous ash are basically remained on a theoretical level, and the recycling device of the nitrogen elements in the aluminous ash is very few, devices for recycling the nitrogen elements in the aluminous ash are urgently needed to be provided.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide kinds of devices for recovering nitrogen elements in aluminous ash, so as to recover nitrogen elements in aluminous ash to the maximum extent, avoid pollution of the aluminous ash (aluminous ash) to the environment in the post-processing process, and realize harmlessness, recycling and benefit of aluminous ash treatment.
The device for recovering nitrogen elements in aluminous ash provided by the invention comprises a reaction kettle and an absorption tower, wherein the reaction kettle is communicated with the absorption tower through a pipeline for collecting ammonia gas.
Compared with the prior art, the device for recovering nitrogen element in aluminum ash that this application provided for aluminum ash mixes with water and forms the thick liquids, carries out hydrolysis reaction, generates the ammonia and transmits to the absorption tower through the pipeline, and then draws nitrogen element. The device provided by the invention can efficiently and quickly recover nitrogen in the aluminum ash, fully utilize the neglected nitrogen elements in the aluminum ash for a long time, effectively solve the problem of pungent odor in the recovery and utilization of the aluminum ash, greatly improve the working environment and ensure the life health of operators.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of the device for recovering nitrogen element in aluminous ash provided by the invention;
FIG. 2 is a schematic structural diagram of the th shell in the device for recovering nitrogen element in aluminous ash provided by the invention;
FIG. 3 is a perspective view of the th casing in the apparatus for recovering nitrogen in aluminous ash according to the present invention;
FIG. 4 is a schematic view of a connection structure of a stirring shaft and a motor in the apparatus for recovering nitrogen element in aluminous ash provided by the present invention;
FIG. 5 is a schematic structural diagram of a filtering device in the device for recovering nitrogen element in aluminous ash provided by the invention.
Detailed Description
The present application is described in further detail in with reference to the drawings and the examples, it being understood that the specific examples are set forth herein for the purpose of illustration only and are not intended to be limiting.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in figures 1 to 5, the device for recovering nitrogen elements in aluminous ash provided by the application comprises a reaction kettle 1 and an absorption tower 2, wherein the reaction kettle 1 is communicated with the absorption tower 2 through a pipeline 3 for collecting ammonia gas.
, the reaction kettle 1 comprises a reaction kettle shell, a stirring shaft 5 is horizontally arranged in the reaction kettle shell, the stirring shaft 5 is connected with a motor 4 positioned outside the reaction kettle shell, and a stirring blade 6 is arranged outside the stirring shaft 5.
As shown in figure 4, the stirring shaft 5 is connected with the reaction kettle shell through a ball bearing 10, the stirring shaft 5 is rotatably connected with the reaction kettle shell, aluminous ash can be poured into a cavity of the reaction kettle through the th through hole 111, water is added into the cavity to form slurry, the reaction kettle shell is rotatably connected with the stirring shaft, after the slurry in the reaction kettle is completely reacted, the reaction kettle shell is rotated to enable the th through hole to be positioned below, and the th through hole can serve as a discharge hole to pour out a mixture.
The stirring shaft 5 and the motor 4 are in gear transmission, the end of the stirring shaft 5 extends out of the reaction kettle shell, the gear is arranged at the end, the end of the stirring shaft 5 is connected with the connecting end and extends out of the reaction kettle shell, the gear is arranged at the connecting end, as shown in fig. 4, the end of the motor shaft of the th motor 4 is provided with the second gear 41, the gear 51 and the second gear 41 are mutually meshed, the stirring shaft rotates under the driving of the motor, the rotation speed of the stirring shaft is preferably 5 r/min-30 r/min, and the slurry is stirred uniformly and ammonia gas is volatilized efficiently.
, the reaction kettle shell comprises a shell 11 and a second shell 12 which are connected through flanges, the flange connection surface between the shell 11 and the second shell 12 is a plane, the planes are distributed along the vertical direction, a through hole 111 and an air outlet hole 112 are arranged above the shell, and the air outlet hole 112 is connected with the pipeline 3.
, the shell 11 and the second shell 12 are both of a hemispherical structure, the inner walls of the shell and the second shell are both provided with a plurality of raised flow baffle plates 7, and the flow baffle plates 7 are deviated from a plane through which a horizontal axis of the reaction kettle shell passes, in the application, the reaction kettle shell is of a spherical structure, and the stirring shaft is positioned on the horizontal axis of the reaction kettle shell, the flow baffle plates are arranged, so that part of slurry formed by mixing aluminum ash and water falls into the flow baffle plates and slides along the flow baffle plates under the action of gravity, and compared with the condition that only blades rotate, the casting stroke and the external retention time of a material body are increased to a certain extent by , so that the reaction of the slurry is more sufficient, the feed liquid is more uniformly mixed, the stirring efficiency is higher, and meanwhile, the release process of gas is accelerated, and the ammonia gas generated by the reaction is conveniently and rapidly taken out.
, the flow baffle plates on the inner wall of the th shell and the second shell are symmetrically distributed about the th plane, and the flow baffle plates on the inner wall of the th shell are uniformly distributed.
in step, the baffle plate on the inner wall of shell extends from side far from the 0 th plane to side where the th plane is located, and the baffle plate and the th plane form an angle of 30-60 degrees as shown in fig. 3, taking a certain baffle plate 7a as an example, the angle α between the th plane I and the plane II where the baffle plate is located is 30-60 degrees.
, the device for recovering nitrogen element in aluminum ash further comprises a support 20, a reaction kettle shell is arranged on the support, a groove portion is arranged below the reaction kettle shell and located in the direction of a th plane, a flange connecting portion of a st shell and a second shell is embedded with the groove portion, a th round hole is arranged on the flange connecting portion in the direction perpendicular to a th plane, a second round hole is arranged on the groove portion, the th round hole and the second round hole are connected through a bolt 21, the support comprises two supporting lugs, round holes are respectively arranged on the two supporting lugs, a stirring shaft is connected with the round holes through a rolling bearing, the bolt 21 is inserted when the aluminum ash in the reaction kettle reacts with water, a th through hole 111 is located above a th shell, the bolt 21 is pulled out after the reaction kettle is reacted, the reaction kettle shell is overturned by 180 degrees, slurry is poured out through the th through hole 111, the th through hole 111 and the outlet hole 112 are staggered with the position of the outlet hole 112 when the reaction kettle shell is not mutually influenced by the corresponding motor support 112 and the outlet port 112.
, a filter unit is arranged on the pipeline, the filter unit comprises a th filter unit for filtering aluminum ash particles, and the filter unit also comprises a second filter unit for filtering water vapor.
In this application, the -th filter device 8 and the second filter device 9 are sequentially arranged on the pipeline 3.
, the filter device 8 comprises a cylindrical filter element 81 and hard filter screens 82 which are positioned on two sides of the filter element, the filter element comprises a filter body structure formed by winding filter cotton, and activated carbon particles are uniformly distributed in the filter body structure;
the pipeline is provided with an -th protruding part 31, two hard filter screens 82 are clamped at two ends of the inner wall of the -th protruding part 31, and the filter element 81 is in seamless contact with the inner wall of the -th protruding part 31 and is supported between the two hard filter screens 82.
, the second filter 9 comprises a second filter element 91 with a cylindrical structure and second hard filter screens 92 positioned at two sides of the second filter element, the components of the second filter element at least comprise types of quicklime, sodium hydroxide and silica gel;
the pipeline is provided with a second protruding part 32, two second hard filter screens 92 are clamped at two ends of the inner wall of the second protruding part 32, and the second filter element 91 is in seamless contact with the inner wall of the second protruding part 32 and is supported in the middle of the two second hard filter screens 92.
The operating principle of the device for collecting nitrogen elements in aluminous ash provided by the application is as follows:
pouring aluminum ash into a cavity of a reaction kettle from a through hole 111 at the th position, adding hot water at the temperature of 60-90 ℃ (such as 60 ℃, 70 ℃, 80 ℃ and 90 ℃) into the cavity of the reaction kettle through a through hole 111 at the th position to form slurry, wherein the mass ratio of the aluminum ash to the water is 1: 1-1: 3, then closing a material inlet, starting a motor 4 to drive a stirring blade 6 on a stirring shaft 5 to rotate, driving the slurry to move by the stirring blade 6, enabling part of the slurry to fall onto a flow baffle plate, sliding along the flow baffle plate under the action of gravity, increasing the casting stroke and the external retention time of a material body to fully stir the slurry, wherein nitrogen elements in the aluminum ash generally exist in the form of AlN and react with water, namely AlN +3H2O＝Al(OH)3+NH3I.e. generation of NH3And then the slurry is separated, the solid particles and water vapor are respectively filtered after the slurry passes through a pipeline and reaches a filtering device, so that a more purified gas is obtained, and finally the gas is absorbed into ammonium salt by an absorption tower through strong acid, and then the shell of the reaction kettle is rotated, so that the reacted slurry is poured out from a th through hole 111.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (8)

  1. A device for recovering nitrogen elements in aluminous ash is characterized by comprising a reaction kettle and an absorption tower, wherein the reaction kettle is communicated with the absorption tower through a pipeline for collecting ammonia gas, and the pipeline is also provided with a filtering device;
    the filter device comprises an th filter device for filtering aluminum ash particles, the th filter device comprises a cylindrical th filter element and th hard filter screens positioned on two sides of the th filter element, the th filter element comprises a filter body structure formed by winding filter cotton, and activated carbon particles are uniformly distributed in the filter body structure;
    be equipped with bulge on the pipeline, two the stereoplasm filter screen block in the both ends of the inner wall of bulge, filter core with the inner wall seamless contact of bulge and support in two the centre of stereoplasm filter screen.
  2. 2. The apparatus for recovering nitrogen in aluminous ash according to claim 1, wherein the reaction kettle comprises a reaction kettle shell, a stirring shaft is horizontally arranged in the reaction kettle shell and is connected with a motor positioned outside the reaction kettle shell, and stirring blades are arranged outside the stirring shaft.
  3. 3. The apparatus for recovering nitrogen elements from aluminous ash according to claim 2, wherein said reaction vessel shell comprises th shell and second shell connected by flanges, the flange connection surface between th shell and said second shell is th plane, said th plane is distributed along vertical direction, th through hole and gas outlet hole are provided above th shell, said gas outlet hole is connected with said pipeline.
  4. 4. The apparatus for recovering nitrogen in aluminous ash according to claim 3, wherein said th shell and said second shell are both of hemispherical structure, and wherein said th shell has a plurality of raised baffles on both inner wall and inner wall of said second shell, said baffles being offset from the plane through which the horizontal axis of said reactor shell passes.
  5. 5. The apparatus for recovering nitrogen elements from aluminous ash according to claim 4, wherein said flow baffles on the inner wall of th shell and said second shell are symmetrically distributed about th plane, and said flow baffles on the inner wall of th shell are uniformly distributed.
  6. 6. An apparatus for recovering nitrogen from aluminous ash as claimed in claim 5, wherein said baffle plate is extended from end far from said plane to side of said plane on the inner wall of said shell, and said baffle plate is at 30-60 ° to said plane.
  7. 7. The apparatus for recovering nitrogen in aluminous ash according to claim 3, further comprising a support on which said reactor shell is mounted;
    the support is provided with a groove part below the reaction kettle shell and in the direction of the th plane, and the flange connecting part of the th shell and the second shell is embedded with the groove part;
    in the direction perpendicular to the th plane, be equipped with the round hole on the flange connecting portion, be equipped with the second round hole on the concave part, be connected through the bolt between round hole and the second round hole.
  8. 8. The apparatus for recovering nitrogen elements from aluminous ash according to any of the preceding claims 1 to 7 and , wherein the filtering apparatus comprises a second filtering apparatus for filtering water vapor, the second filtering apparatus comprises a second cylindrical filter element and second hard filter screens positioned at two sides of the second filter element, and the second filter element comprises at least of quicklime, sodium hydroxide and silica gel;
    the pipeline is provided with a second protruding part, two second hard filter screens are clamped at two ends of the inner wall of the second protruding part, and the second filter element is in seamless contact with the inner wall of the second protruding part and is supported in the middle of the two second hard filter screens.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107262501B (en) * 2017-07-07 2020-03-03 南通大学 Reaction device for removing nitrogen from aluminum ash and nitrogen removal system
CN107321227B (en) * 2017-07-07 2020-09-08 江苏海光金属有限公司 Slurry preparation device for aluminum ash hydrolysis and denitrification pretreatment
CN108117091A (en) * 2018-01-10 2018-06-05 南通大学 Aluminium clinker water solution denitrogenates apparatus control method
CN108663482A (en) * 2018-04-27 2018-10-16 南通大学 Ammonia concentration detection method after gas concentration detection apparatus and the hydrolysis of aluminium lime-ash

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN88100289A (en) * 1987-01-20 1988-12-07 阿托化学公司 With vinylchlorid is the mass polymerization production method of the polymkeric substance and the multipolymer of main component
CN204107347U (en) * 2014-10-21 2015-01-21 武汉钢铁(集团)公司 The anti-NH of constant temperature 3the SCR method distributing instrument of corrosion
CN104511229A (en) * 2013-09-29 2015-04-15 天津众邦化工有限公司 Tail gas absorption device used in preparation of sodium pentachlorophenate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008006797B4 (en) * 2008-01-30 2014-05-22 Heraeus Precious Metals Gmbh & Co. Kg Methods and apparatus for removing ruthenium by distillation as RuO4 from ruthenated solutions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN88100289A (en) * 1987-01-20 1988-12-07 阿托化学公司 With vinylchlorid is the mass polymerization production method of the polymkeric substance and the multipolymer of main component
CN104511229A (en) * 2013-09-29 2015-04-15 天津众邦化工有限公司 Tail gas absorption device used in preparation of sodium pentachlorophenate
CN204107347U (en) * 2014-10-21 2015-01-21 武汉钢铁(集团)公司 The anti-NH of constant temperature 3the SCR method distributing instrument of corrosion

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