CN106244746A - A kind of rustless steel casting residue processes process and device - Google Patents
A kind of rustless steel casting residue processes process and device Download PDFInfo
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- CN106244746A CN106244746A CN201610826498.6A CN201610826498A CN106244746A CN 106244746 A CN106244746 A CN 106244746A CN 201610826498 A CN201610826498 A CN 201610826498A CN 106244746 A CN106244746 A CN 106244746A
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- casting residue
- screening
- grinding machine
- time
- slow cooling
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a kind of rustless steel casting residue to process process and device, belongs to metallurgical solid waste and utilizes technical field.Described process includes: slow cooling processes, for the first time screening, grinding machine rolls, second time is sieved, dewatering operation and magnetic separation process.Described process unit includes: tipple, screening machine, grinding machine, rotary screen, dewaterer and magnetic separator.Tumbled out by casting residue by tipple and carry out slow cooling process, the casting residue processed through slow cooling carries out sieving for the first time by screening machine, the siftage of screening machine enters in grinding machine under the impact of water under high pressure and rolls further, the rotary screen arranged by grinding machine exit is carried out second time and sieves, the siftage of rotary screen enters dewaterer and carries out dewatering operation, and the casting residue material after dehydration and non magnetic is deposited according to magnetic respectively by magnetic separator.The present invention uses Whote-wet method processing mode, it is to avoid dry ash produces, and separates metal and nonmetal step by step, makes recovery rate of iron reach more than 90%.
Description
Technical field
The present invention relates to metallurgical solid waste and utilize technical field, specifically, particularly to science and engineering at a kind of rustless steel casting residue
Process and device.
Background technology
According to statistics, in slag, tenor about 10%.Nickel, chromium etc. is contained valuable rare heavy in rustless steel casting residue
Metal, is likely to result in serious environmental pollution as dealt with improperly, so the metal reclaimed in rustless steel casting residue, it is achieved stainless
Steel casting residue resource regeneration is the major issue that iron and steel enterprise faces.
At present, domestic rustless steel manufacturer mainly according to the physical characteristic of rustless steel casting residue, uses the process of hot application
Mode, uses the disk absorption residual steel of bulk after processing casting residue hot application, remaining tailings is transported into stockyard and stores up.But, this
Planting hot application processing mode metal recovery rate low, production environment is poor.
Summary of the invention
In view of problem above, the present invention provides a kind of rustless steel casting residue to process process and device, raw to rustless steel
The casting residue produced during product is carried out efficiently, the process of environmental protection, reclaims the metal in casting residue, and centralized recovery tailings, real
The utilization of resources of existing tailings, the metal recovery rate solving the process technique existence of existing casting residue hot application is low, production environment difference
Problem.
A kind of rustless steel casting residue of the present invention processes process, and it comprises the following steps:
(1) casting residue slow cooling is processed；
(2) casting residue through slow cooling carries out screening for the first time to process；
(3) being stored up by the oversize that described first time sieves, the siftage of screening of described first time is in the impact of water under high pressure
Under flow to grinding machine and carry out rolling broken；
(4) to through described grinding machine roll broken casting residue carry out second time screening process；
(5) being stored up by the oversize that described second time is sieved, the siftage sieving described second time carries out dewatering operation；
(6) casting residue after dehydration is carried out magnetic separation process.
Preferably, described process also comprises the steps (7):
The grain slag produced during described step (1) and described step (5) is carried out drainage, dries operation.
Preferably, described step (1) also includes following dust removal step:
Wet dedusting, carries out wet dedusting process, rear discharge up to standard by the dust-laden steam produced in described step (1).
Preferably, in described step (1), described slow cooling process be to use operation of manually fetching water, the activity duration be 24～
36h, and after operation 1～2h of fetching water, the stirring operation that the casting residue after fetching water is interrupted.
Preferably, in described step (5), the siftage of described second time screening is the casting residue that granularity is less than 2mm, enters
Row dewatering operation.
The process unit of process is processed for a kind of rustless steel casting residue, including:
Tipple, carries out slow cooling process for tumbling out by casting residue；
Screening machine, processes, on the sieve of described screening machine for the casting residue processed through slow cooling carries out screening for the first time
Thing is stored up, and the siftage of described screening machine is entered in receiver bin by the first belt feeder；
Grinding machine, described grinding machine is provided with charging aperture and discharging opening, logical between charging aperture and the described receiver bin of described grinding machine
Piping connects, and the casting residue in described receiver bin is broken downstream to rolling in described grinding machine in the impact of water under high pressure；
Rotary screen, is connected with the discharging opening of described grinding machine, for carrying out rolling broken casting residue through described grinding machine
Screening for the second time processes, and the oversize of described rotary screen is stored up；
Dewaterer, for carrying out dewatering operation to the siftage of described rotary screen；
Magnetic separator, is used for the casting residue material after dehydration according to magnetic and non magnetic further separation, deposits respectively.
Further, it is preferable to, described tipple is crane.
Preferably, the one during described screening machine is vibration strip-type screen, grid sieve；Described grinding machine is ball mill, rod mill
In one；Described dewaterer is the one in high-frequency dewatering screen, thickener.
Preferably, described magnetic separator is permanent magnetic pulley belt feeder.
Preferably, described process unit also includes:
Dust excluding hood, is positioned at the top of Pile of steel slag, for absorbing the dust-containing water produced in casting residue slow cooling processing procedure
Vapour；Wet-way dust-collector, is connected with described dust excluding hood by dedusting pipeline, for carrying out described dust-laden steam at wet dedusting
Reason.
Preferably, described process unit also includes:
Sedimentation tank, for depositing the grain slag produced in casting residue slow cooling process and dehydration process；Clamshell crane, position
In the top of described sedimentation tank, dry work for the sediment stockyard of the grain slag crawl in described sedimentation tank to side is carried out drainage
Industry.
Compared with prior art, advantages of the present invention and beneficial effect have:
One, the present invention uses Whote-wet method processing mode, it is to avoid the generation of dry ash, it is ensured that good production environment；
Two, the present invention is to have employed screening-grinding machine-second time screening-dehydration-magnetic separation for the first time in the process of casting residue
Technique, it is achieved separate metal and nonmetal step by step, screening for the first time obtains the residual steel of big lumpiness and deposits, siftage entering through grinding machine
One step rolls broken, and second time screening obtains steel grit and deposits, and the siftage of second time screening is small grain size casting residue, after dehydration,
Material is deposited by magnetic according to the performance of small grain size casting residue respectively, makes metal recovery rate improve, reaches more than 90%.
Accompanying drawing explanation
Fig. 1 is rustless steel casting residue processing technological flow figure of the present invention；
Fig. 2 is the site plan that rustless steel casting residue of the present invention processes process unit preferred embodiment；
Fig. 3 is the A-A sectional view of Fig. 2；
Fig. 4 is the B-B sectional view of Fig. 2.
Detailed description of the invention
In conjunction with accompanying drawing, the present invention is described further.
Fig. 1 is rustless steel casting residue processing technological flow figure of the present invention.As it is shown in figure 1, rustless steel of the present invention
Casting residue processes process and comprises the following steps:
(1) casting residue slow cooling is processed；
(2) casting residue through slow cooling carries out screening for the first time to process；
(3) being stored up by the oversize that described first time sieves, the siftage of screening of described first time is in the impact of water under high pressure
Under flow to grinding machine and carry out rolling broken；
(4) to through described grinding machine roll broken casting residue carry out second time screening process；
(5) being stored up by the oversize that described second time is sieved, the siftage sieving described second time carries out dewatering operation；
(6) casting residue after dehydration is carried out magnetic separation process；
(7) grain slag produced during described step (1) and described step (5) is carried out drainage, dries operation.
Described step (1) also includes following dust removal step:
Wet dedusting, carries out wet dedusting process by the dust-laden steam produced in described step (1), up to standard after enter big
Gas, it is to avoid dust flies away, to ensure good production environment.
Fig. 2 is the site plan that rustless steel casting residue of the present invention processes process unit preferred embodiment, and Fig. 3 is figure
The A-A sectional view of 2, Fig. 4 is the B-B sectional view of Fig. 2.
As shown in Figure 2, Figure 3 and Figure 4, rustless steel casting residue of the present invention process process unit includes:
Crane 100, carries out slow cooling process for being tumbled by the casting residue in slag ladle 110 to Pile of steel slag 120；
Vibration strip-type screen 200, processes for the casting residue processed through slow cooling carries out screening for the first time, described vibrator bar
The oversize of shape sieve 200 drains in the first stockyard 210 to be stored up, and the siftage of described vibration strip-type screen is that granularity is less than 150mm's
Casting residue, enters in receiver bin 230 by the first belt feeder 220, and wherein, the bar shaped steel spacing of described vibration strip-type screen 200 is
150mm, screen angle is 17.5 °, and Oscillation Amplitude is 6～8mm, and frequency of vibration is less than 20Hz；
Ball mill 300, described ball mill 300 is provided with charging aperture 301 and discharging opening 302, wherein, described charging aperture 301
Be connected by pipeline with between described receiver bin 230, the casting residue in described receiver bin 230 in the impact of water under high pressure downstream to institute
State ball mill 300 rolls broken, wherein, the feed size of described ball mill 300 be less than 150mm, going out of described ball mill 300
Material uses rotary screen to sieve；
Rotary screen, screen cloth is 12 mesh, is connected with the discharging opening 302 of described ball mill 300, for through described ball mill
300 roll broken casting residue carries out second time screening process, the tail that oversize is more than 2mm of described rotary screen (not shown)
Slag, drains into the second stockyard 420 by the second belt feeder 410 and deposits, and the siftage of described rotary screen is the tail that granularity is less than 2mm
Slag, enters lower road dehydration device and carries out dewatering operation；
High-frequency dewatering screen 500, for the siftage of described rotary screen carries out dewatering operation, wherein, described high frequency is dehydrated
The feed size of sieve 500 is less than 2mm, and compass screen surface angle is 5～7 °, and frequency of vibration is 850～1000Hz, through high-frequency dewatering screen
The casting residue moisture content of 500 effects is less than 10%；
Permanent magnetic pulley belt feeder 600, the casting residue raw meal particle size after dehydration is less than 2mm, shows according to small grain size casting residue
The magnetic gone out, selects described permanent magnetic pulley belt feeder 600 to carry material, under the effect of permanent magnetic pulley, is pressed by casting residue material
According to magnetic and non magnetic further separation, depositing respectively to the 3rd stockyard 610 and the 4th stockyard 620, wherein, described permanent magnetism rolls
The cylinder raw meal particle size that can carry of belt feeder 600 is less than 2mm, and belt feeder width is 600mm, described 3rd stockyard 610 and described the
Separating plate 630 (shown in Fig. 4) it is provided with between four stockyards 620.
To in casting residue slow cooling processing procedure, dust can be produced.For avoiding dust to fly away, surrounding enviroment are caused dirt
Dye, is provided above dust excluding hood 130 at Pile of steel slag 120, contains generation in casting residue slow cooling processing procedure for absorbing
Dirt steam；Wet-way dust-collector 140 is connected with described dust excluding hood 130 by dedusting pipeline 150, for entering described dust-laden steam
Row wet dedusting processes, and the rear chimney 160 that passes through up to standard enters air.
Fill the slag ladle 110 of casting residue under the roll-over action of crane 100, tumble to Pile of steel slag 120, to casting residue
Slow cooling process to use and manually fetch water, after 1～2h, loader 170 stirring that is interrupted the casting residue after fetching water is made
Industry, wherein, manually fetch water activity duration 24h～36h.It is provided above dust excluding hood 130, at slag heap at Pile of steel slag 120
The dust-laden steam that All Jobs in the range of field 120 produces all is absorbed by dust excluding hood 130, and wherein, dust-containing water drum includes slag of tumbling
The steam that the dust of tank 110 generation and casting residue produce during fetching water.Dust-laden steam is delivered to wet method by dedusting pipeline 150
Dust arrester 140 carries out wet dedusting process, up to standard after discharge through chimney 160.
Need through after-treatment at the casting residue processed through a slow cooling.Casting residue after slow cooling processes passes through
Loader 170 transport is to above vibration strip-type screen 200, and the residual steel of big lumpiness of the oversize of described vibration strip-type screen 200 unloads to the
Depositing in one stockyard 210, the siftage of described vibration strip-type screen 200 is then delivered to receiver bin 230 by the first belt feeder 220
In, it is connected by pipeline between described receiver bin 230 and the charging aperture 301 of ball mill 300.More than casting in described receiver bin 230
Slag enters in described ball mill 300 under the impact of water under high pressure, and under the effect that repeatedly rolls of steel ball, casting residue breaks further
Broken.Outlet at described ball mill 300 is provided with rotary screen, and the oversize of described rotary screen is the casting residue of more than 2mm, passes through
Second belt feeder 410 is delivered in the second stockyard 420 deposit, and the siftage of described rotary screen then enters in high-frequency dewatering screen 500,
Carry out dewatering operation.Casting residue material through dehydration is carried, in the effect of permanent magnetic pulley by permanent magnetic pulley belt feeder 600
Under, material according to magnetic and non magnetic is deposited in the 3rd stockyard 610 and the 4th stockyard 620 by separating plate 630 respectively.
Drain in sedimentation tank 700 at grain slag produced by casting residue slow cooling process and after-treatment, at described sedimentation tank 700
It is provided above gate-type clamshell crane 710, described gate-type clamshell crane 710 by grab bucket, grain slag is captured the sediment to side
Stockyard 720 carries out drainage, dries operation, after a period of time, the tailings dried through drainage can be transported to suitable area and carry out
Centralized recovery, it is achieved the comprehensive utilization of tailings resource.
In sum, rustless steel casting residue of the present invention processes technique and casting residue is carried out twice process, as follows:
Slow cooling processes: using operation of manually fetching water, the activity duration is 24～36h, and remaining to casting in processing procedure
Slag carries out the stirring operation being interrupted, and the dust-laden steam produced in overall process is all arranged on the dust excluding hood on roof and absorbs, by removing
Dirt pipelined processes to Wet-way dust-collector.
After-treatment: casting residue is through " vibration strip-type screen-ball mill-rotary screen-high-frequency dewatering screen-permanent magnetic pulley belt
Machine ", it is achieved separating metal and nonmetal step by step, vibration strip-type screen obtains the granularity residual steel of big lumpiness more than 150mm and deposits, and passes through
Rolling further of grinding machine is broken, and grinding machine outlet is provided with rotary screen discharging, through the available granularity of rotary screen screening more than 2mm's
Steel grit is deposited, and small grain size casting residue, through high-frequency dewatering screen processed, is finally cast according to small grain size by permanent magnetic pulley belt feeder
Material is deposited by the magnetic of recrement performance respectively, improves recovery rate of iron, makes recovery rate of iron reach more than 90%.
Claims (10)
1. a rustless steel casting residue processes process, it is characterised in that comprise the following steps:
(1) casting residue slow cooling is processed；
(2) casting residue through slow cooling carries out screening for the first time to process；
(3) being stored up by the oversize that described first time sieves, the siftage of screening of described first time is dirty in the impact of water under high pressure
Enter grinding machine and carry out rolling broken；
(4) to through described grinding machine roll broken casting residue carry out second time screening process；
(5) being stored up by the oversize that described second time is sieved, the siftage sieving described second time carries out dewatering operation；
(6) casting residue after dehydration is carried out magnetic separation process.
Process the most according to claim 1, it is characterised in that described process also comprises the steps (7):
The grain slag produced during described step (1) and described step (5) is carried out drainage, dries operation.
Process the most according to claim 1, it is characterised in that described step (1) also includes following dust removal step:
Wet dedusting, carries out wet dedusting process, rear discharge up to standard by the dust-laden steam produced in described step (1).
Process the most according to claim 1, it is characterised in that in described step (1), it is to adopt that described slow cooling processes
With operation of manually fetching water, the activity duration is 24～36h, and after operation 1～2h of fetching water, is interrupted the casting residue after fetching water
Stirring operation.
Process the most according to claim 1, it is characterised in that in described step (5), the screening of described second time
Siftage is the casting residue that granularity is less than 2mm, carries out dewatering operation.
6. process the process unit of process for the rustless steel casting residue described in claim 1, it is characterised in that including:
Tipple, carries out slow cooling process for tumbling out by casting residue；
Screening machine, processes for the casting residue processed through slow cooling carries out screening for the first time, the oversize heap of described screening machine
Depositing, the siftage of described screening machine is entered in receiver bin by the first belt feeder；
Grinding machine, described grinding machine is provided with charging aperture and discharging opening, by pipe between charging aperture and the described receiver bin of described grinding machine
Road connects, and the casting residue in described receiver bin is broken downstream to rolling in described grinding machine in the impact of water under high pressure；
Rotary screen, is connected with the discharging opening of described grinding machine, for carrying out second to rolling broken casting residue through described grinding machine
Secondary screening processes, and the oversize of described rotary screen is stored up；
Dewaterer, for carrying out dewatering operation to the siftage of described rotary screen；
Magnetic separator, is used for the casting residue material after dehydration according to magnetic and non magnetic further separation, deposits respectively.
Process unit the most according to claim 6, it is characterised in that described process unit also includes:
Dust excluding hood, is positioned at the top of Pile of steel slag, for absorbing the dust-laden steam produced in casting residue slow cooling processing procedure；
Wet-way dust-collector, is connected with described dust excluding hood by dedusting pipeline, for described dust-laden steam is carried out wet dedusting
Process.
Process unit the most according to claim 6, it is characterised in that described process unit also includes:
Sedimentation tank, for depositing the grain slag produced in casting residue slow cooling process and dehydration process；
Clamshell crane, is positioned at the top of described sedimentation tank, for the grain slag in described sedimentation tank is captured the sediment heap to side
Field carries out drainage and dries operation.
Process unit the most according to claim 6, it is characterised in that during described screening machine sieves for vibration strip-type screen, grid
One；Described grinding machine is the one in ball mill, rod mill；Described dewaterer is the one in high-frequency dewatering screen, thickener.
Process unit the most according to claim 6, it is characterised in that described magnetic separator is permanent magnetic pulley belt feeder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826498.6A CN106244746B (en) | 2016-09-14 | 2016-09-14 | A kind of stainless steel casting residue processing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826498.6A CN106244746B (en) | 2016-09-14 | 2016-09-14 | A kind of stainless steel casting residue processing method and device |
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| Publication Number | Publication Date |
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| CN106244746A true CN106244746A (en) | 2016-12-21 |
| CN106244746B CN106244746B (en) | 2019-01-04 |
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| CN201610826498.6A Active CN106244746B (en) | 2016-09-14 | 2016-09-14 | A kind of stainless steel casting residue processing method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109331975A (en) * | 2018-10-24 | 2019-02-15 | 中南大学 | A method of extracting metallic aluminium in aluminium ash |
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| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN202626212U (en) * | 2012-05-23 | 2012-12-26 | 济钢集团国际工程技术有限公司 | Moveable dust removing device |
| CN102978305A (en) * | 2012-12-15 | 2013-03-20 | 武钢集团昆明钢铁股份有限公司 | Molten steel casting residue treatment and recycling method |
| CN206052055U (en) * | 2016-09-14 | 2017-03-29 | 中冶华天南京工程技术有限公司 | A kind of rustless steel casting residue handling process device |
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- 2016-09-14 CN CN201610826498.6A patent/CN106244746B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
| CN202626212U (en) * | 2012-05-23 | 2012-12-26 | 济钢集团国际工程技术有限公司 | Moveable dust removing device |
| CN102978305A (en) * | 2012-12-15 | 2013-03-20 | 武钢集团昆明钢铁股份有限公司 | Molten steel casting residue treatment and recycling method |
| CN206052055U (en) * | 2016-09-14 | 2017-03-29 | 中冶华天南京工程技术有限公司 | A kind of rustless steel casting residue handling process device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109331975A (en) * | 2018-10-24 | 2019-02-15 | 中南大学 | A method of extracting metallic aluminium in aluminium ash |
| CN109331975B (en) * | 2018-10-24 | 2023-04-11 | 中南大学 | Method for extracting metal aluminum from aluminum ash |
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| CN106244746B (en) | 2019-01-04 |
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