CA2615587C - Process and apparatus to screen and prepare an oil sand slurry - Google Patents
Process and apparatus to screen and prepare an oil sand slurry Download PDFInfo
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- CA2615587C CA2615587C CA2615587A CA2615587A CA2615587C CA 2615587 C CA2615587 C CA 2615587C CA 2615587 A CA2615587 A CA 2615587A CA 2615587 A CA2615587 A CA 2615587A CA 2615587 C CA2615587 C CA 2615587C
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- Prior art keywords
- screening
- screening means
- oil sand
- material bed
- sand slurry
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- 239000003027 oil sand Substances 0.000 title claims abstract description 65
- 239000002002 slurry Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 30
- 238000012216 screening Methods 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007921 spray Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 14
- 238000005065 mining Methods 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 abstract description 21
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- -1 gravel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005007 materials handling Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/02—General arrangement of separating plant, e.g. flow sheets specially adapted for oil-sand, oil-chalk, oil-shales, ozokerite, bitumen, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/16—Feed or discharge arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/18—Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2230/00—Specific aspects relating to the whole B07B subclass
- B07B2230/01—Wet separation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
An apparatus to form, agitate and screen a bed of oil sand slurry to prepare it for hydro transport and reduce the amount of oversize. The apparatus has a plurality of screens, having a frame and screen bodies supported on springs, directional oscillating movements being imparted to the screen bodies by a motor powered vibrating mechanism. The screen bodies comprise two or more individual screening sections, which are decreasingly inclined in the direction of the material flow. Between the different screening sections is an agitation zone realized through a vertical screen section, where material is in free fall and agitated by means of water.
Description
PROCESS AND APPARATUS TO SCREEN AND PREPARE AN OIL SAND
SLURRY
FIELD OF THE INVENTION
This invention relates to ore processing. In particular, this invention relates to a process and an apparatus to screen and prepare oil sand slurry for being pumped through a pipe line. This invention will realize to form a material bed and to alternate screening and agitating the material bed in order to minimize the oversize reject downstream of the invention.
BACKGROUND OF THE INVENTION
Oil sand mining and processing equipment technology is unique to the deposits found in Northern Alberta, Canada, in terms of the evolution of process equipment suitable for mining and processing the oil sand ore. In the oil sand mine, equipment used to excavate and transport the run-of-mine (ROM) oil sand ore is as large in scale as at any worldwide mining operations, typically using electric-hydraulic shovels of up to 62 cubic meter capacity buckets loading into haulage trucks of up to 400 tons capacity to transport the ROM oil sand ore to a centralized oil sand slurry preparation facility.
Due to the massive scale of the mining equipment and the characteristics of the oil sand itself, the ore mined typically contains a very large range of lump sizes spanning from 3,500 mm weighing up to 30 tonnes, down to clay particles of a less than one millimeter diameter. The ROM oil-sand ore typically contains up to 15% free water, 6%
to 18% bitumen and 75% to 85% solids of which 95% is sand content by weight and also contains amounts of siltstone rock having an unconfined compressive strength of 165 to 221 MPa as a waste component.
The harsh environmental conditions at oil-sand operations encompass an ambient temperature range from +35 degrees Celsius down to -51 degrees Celsius.
Materials handling properties of the ROM ore are highly variable over this temperature range. The oil sand ore comprises frozen, highly abrasive lumps in winter but exhibits sticky, cohesive behavior in summer, largely due to the influence of the contained moisture and bitumen components.
A slurry preparation process step is typically required to prepare all ROM ore to be suitable for long distance transport as a water slurry to be pumped to a remote upgrading facility, at single-stream production rates which may exceed 10,000 tonnes per hour of ROM oil sand ore. Typical prerequisites for efficient slurry pumping are crushing and screening the oil sand ore to a maximum lump size of e.g. 100 mm followed by the preparation of a homogeneous water slurry, typically with a consistency of about 64%
solids by weight at a slurry specific gravity of approximately 1.5.
hi a typical oil sand preparation process a step of screening the oil sand slurry is required to ensure the predefined maximum particle size. The processes and machines currently in use were taken from conventional screening processes and machines that were developed to process dry material, e.g. gravel, sand, crushed stone, etc. Due to the requirement of processing a wet oil sand sluny difficulties arise.
Disadvantages of the prior art of processes and machines to screen and prepare an oil sand slurry lead to a lower screening efficiency resulting in a higher reject rate. Rejected material will be piled up, transported back to the first process step, and will be processed again. In order to decrease the cost of operation the reject rate has to be kept low.
Using prior art technology results in a material bed on the screen that is of high viscosity due to the defined addition of water. Within this material bed the oil sand will stick together and will not fall through tic holes, even if it is undersize material. Furthermore only the lower area of the material bed, which is in direct contact with the screen, will be screened. The material in the upper area will stick together as a material bed and will not be subject to being screened. Due to the sticky cohesive behavior the feed section of the screen might get plugged frequently.
DESCRIPTION OF DRAWINGS
Fig 1 shows the cross section of a typical arrangement of a vibrating screen.
The vibrating screen consists of a main frame (8), an intermediate frame (7), springs (3) between the -frames (7 and 8), springs (2) between the intermediate frame and the foundation, an excentric drive (1) which provides vibration to the screen sections and different screen sections at different inclinations (4, 5, 6), and water spray bars (18) spraying water (10) in the agitation zones to improve the agitation of the oil sand. The oil sand slurry (9), which may be formed in a rotating vessel, fed with oil sand and water and further additives to improve the creation of a homogenous oil sand slurry, is subsequently fed to the screen in the feed end section (20) and forms a material bed. After the discharge section of the first screen (22) the material enters the agitation zone (17) and drops down onto the feed section of the second screen (23). After the discharge section of the second screen (24) the material enters the agitation zone (17) and drops down onto the feed section of the third screen (25). The oversize material is leaving the screen through the oversize discharge section (21). The screen decks have decreasing inclinations al on the first screening section (4), a -) on the second screening section (5), and as on the third screening section (6), seen in the direction of the material flow.
Fig 2 shows the material bed of the oil sand slurry on the screen (19) representing any of the screen sections (4), (5), or (6) as it will build up during the process of screening. A
lower part of the material bed (14) comprising the oil sand slurry is subject to screening, whereas the upper part of the material bed (15) comprising the oil sand slurry will not be screened out since it is blocked by bigger lumps or due to the sticky cohesive behavior of the oil sand slurry.
Fig 3 shows an agitation zone (17) which is placed between two following screening sections. The material will be in free fall and exposed to the water (10) that is sprayed by spray bars (18) placed above the screening sections, oriented to spray the water onto the agitation zones, improving the agitation. Substantially vertical screen decks (16) allow undersize material (11) to be screened out in the agitation zone.
Fig 4 illustrate the process, using a pair of screens, of receiving the oil sand slurry, screening said slurry at a pre-defined inclination al and speed v1, agitating the material and screening it again at a pre-defined inclination a, and speed v2, where the inclination of the screen sections and the relative speeds of the material is decreasing seen in the direction of the material flow. Undersize material that has been screened out will be fed to the pump box. Oversize material will be rejected.
Fig 5 shows a similar process comprising the process illustrated in Fig 4 with an additional screening section and an additional agitation zone.
DETAILED DESCRIPTION OF THE INVENTION
In one aspect the invention provides a process to screen and agitate an oil sand slurry, employing the process steps of receiving an oil sand slurry, forming a material bed, screening the oil sand slurry at a predefined relative speed.
In another aspect the invention provides an apparatus to screen and agitate an oil sand slurry (9), comprising a main frame (8), an intermediate frame (7), lower and upper springs (2 and 3), a vibration means in the form of an eccentric drive (1), two or more screening sections (4, 5, 6) of decreasing inclination in the direction of material flow, one or more agitation zones (17) between the screen decks, vertical screens (16) in the agitation zone, water spray bars (18) in the agitation zones (17) .
The oil sand slurry comprising oil sand and water enters the screen in the feed end and forms a material bed. The material bed consisting of oil sand slurry is accelerated by eccentric drives in the direction of the desired material flow due to the pre-determined throw angle. The amplitude of this acceleration is adjustable. The angle of this acceleration is predefined. The oil sand slurry passes over and through a series of alternating means to screen and agitate the oil sand slurry in order to screen out the undersize particles of the oil sand slurry. Oversize particles will be discharged at the discharge end of the screen.
To overcome potential plugging of the feed end, due to the sticky cohesive behavior of said material bed, the first screen section has a high inclination, to allow for a high relative speed between the oil sand slurry and the screen deck. The following screen or screens in direction of the material flow have successively decreasing inclinations in order to successively increase the retention time of the oil sand slurry on the screen deck.
By defining the relative speeds and thus the inclination of said screen sections a maximum screening efficiency can be achieved while simultaneously avoiding the feed end of the screen to be plugged. Said inclinations of said respective screening means are preferrably between 10 and 20 degrees relative to a horizontal plane.
To overcome said reduction of screening efficiency due to the sticky cohesive behavior of the oil sand slurry and the said material bed that forms due to the sticky cohesive behavior agitating means are introduced between two following screen sections.
An agitation zone is a zone between the discharge end of a screen section and the feed end of the following screen section, seen in direction of material flow, where said discharge end is higher in elevation than said feed end of said following screen section, allowing for the material to be in free fall. Furthermore spray bars 18 might be placed above the agitation zone to spray water on the oil sand slurry being in free fall in the agitation zone. Said water impinges on said falling material bed to improve the agitation of said oil sand slurry. Said material bed, agitated by said free fall and by said water from said water spray bars 18 , eventually falls on the feed end of the following screen section and breaks up furthermore. Said agitation zone 17 is an integral part of the process or the apparatus.
Furthermore the substantially vertical screen sections 16 might be equipped with holes 25 allowing for immediate screening of the agitated material in the agitation zone 17. Said immediate screening through said holes 25 of said substantial vertical screen section 16 furthermore avoids a pile up or pocket of said oil sand slurry in the agitation zone 17.
Such a pile up or pocket might form a surface, on which the material might slide, from the discharge end of one screen section to the feed end of a following screen section instead of allowing for free fall, what is required to allow for agitation.
SLURRY
FIELD OF THE INVENTION
This invention relates to ore processing. In particular, this invention relates to a process and an apparatus to screen and prepare oil sand slurry for being pumped through a pipe line. This invention will realize to form a material bed and to alternate screening and agitating the material bed in order to minimize the oversize reject downstream of the invention.
BACKGROUND OF THE INVENTION
Oil sand mining and processing equipment technology is unique to the deposits found in Northern Alberta, Canada, in terms of the evolution of process equipment suitable for mining and processing the oil sand ore. In the oil sand mine, equipment used to excavate and transport the run-of-mine (ROM) oil sand ore is as large in scale as at any worldwide mining operations, typically using electric-hydraulic shovels of up to 62 cubic meter capacity buckets loading into haulage trucks of up to 400 tons capacity to transport the ROM oil sand ore to a centralized oil sand slurry preparation facility.
Due to the massive scale of the mining equipment and the characteristics of the oil sand itself, the ore mined typically contains a very large range of lump sizes spanning from 3,500 mm weighing up to 30 tonnes, down to clay particles of a less than one millimeter diameter. The ROM oil-sand ore typically contains up to 15% free water, 6%
to 18% bitumen and 75% to 85% solids of which 95% is sand content by weight and also contains amounts of siltstone rock having an unconfined compressive strength of 165 to 221 MPa as a waste component.
The harsh environmental conditions at oil-sand operations encompass an ambient temperature range from +35 degrees Celsius down to -51 degrees Celsius.
Materials handling properties of the ROM ore are highly variable over this temperature range. The oil sand ore comprises frozen, highly abrasive lumps in winter but exhibits sticky, cohesive behavior in summer, largely due to the influence of the contained moisture and bitumen components.
A slurry preparation process step is typically required to prepare all ROM ore to be suitable for long distance transport as a water slurry to be pumped to a remote upgrading facility, at single-stream production rates which may exceed 10,000 tonnes per hour of ROM oil sand ore. Typical prerequisites for efficient slurry pumping are crushing and screening the oil sand ore to a maximum lump size of e.g. 100 mm followed by the preparation of a homogeneous water slurry, typically with a consistency of about 64%
solids by weight at a slurry specific gravity of approximately 1.5.
hi a typical oil sand preparation process a step of screening the oil sand slurry is required to ensure the predefined maximum particle size. The processes and machines currently in use were taken from conventional screening processes and machines that were developed to process dry material, e.g. gravel, sand, crushed stone, etc. Due to the requirement of processing a wet oil sand sluny difficulties arise.
Disadvantages of the prior art of processes and machines to screen and prepare an oil sand slurry lead to a lower screening efficiency resulting in a higher reject rate. Rejected material will be piled up, transported back to the first process step, and will be processed again. In order to decrease the cost of operation the reject rate has to be kept low.
Using prior art technology results in a material bed on the screen that is of high viscosity due to the defined addition of water. Within this material bed the oil sand will stick together and will not fall through tic holes, even if it is undersize material. Furthermore only the lower area of the material bed, which is in direct contact with the screen, will be screened. The material in the upper area will stick together as a material bed and will not be subject to being screened. Due to the sticky cohesive behavior the feed section of the screen might get plugged frequently.
DESCRIPTION OF DRAWINGS
Fig 1 shows the cross section of a typical arrangement of a vibrating screen.
The vibrating screen consists of a main frame (8), an intermediate frame (7), springs (3) between the -frames (7 and 8), springs (2) between the intermediate frame and the foundation, an excentric drive (1) which provides vibration to the screen sections and different screen sections at different inclinations (4, 5, 6), and water spray bars (18) spraying water (10) in the agitation zones to improve the agitation of the oil sand. The oil sand slurry (9), which may be formed in a rotating vessel, fed with oil sand and water and further additives to improve the creation of a homogenous oil sand slurry, is subsequently fed to the screen in the feed end section (20) and forms a material bed. After the discharge section of the first screen (22) the material enters the agitation zone (17) and drops down onto the feed section of the second screen (23). After the discharge section of the second screen (24) the material enters the agitation zone (17) and drops down onto the feed section of the third screen (25). The oversize material is leaving the screen through the oversize discharge section (21). The screen decks have decreasing inclinations al on the first screening section (4), a -) on the second screening section (5), and as on the third screening section (6), seen in the direction of the material flow.
Fig 2 shows the material bed of the oil sand slurry on the screen (19) representing any of the screen sections (4), (5), or (6) as it will build up during the process of screening. A
lower part of the material bed (14) comprising the oil sand slurry is subject to screening, whereas the upper part of the material bed (15) comprising the oil sand slurry will not be screened out since it is blocked by bigger lumps or due to the sticky cohesive behavior of the oil sand slurry.
Fig 3 shows an agitation zone (17) which is placed between two following screening sections. The material will be in free fall and exposed to the water (10) that is sprayed by spray bars (18) placed above the screening sections, oriented to spray the water onto the agitation zones, improving the agitation. Substantially vertical screen decks (16) allow undersize material (11) to be screened out in the agitation zone.
Fig 4 illustrate the process, using a pair of screens, of receiving the oil sand slurry, screening said slurry at a pre-defined inclination al and speed v1, agitating the material and screening it again at a pre-defined inclination a, and speed v2, where the inclination of the screen sections and the relative speeds of the material is decreasing seen in the direction of the material flow. Undersize material that has been screened out will be fed to the pump box. Oversize material will be rejected.
Fig 5 shows a similar process comprising the process illustrated in Fig 4 with an additional screening section and an additional agitation zone.
DETAILED DESCRIPTION OF THE INVENTION
In one aspect the invention provides a process to screen and agitate an oil sand slurry, employing the process steps of receiving an oil sand slurry, forming a material bed, screening the oil sand slurry at a predefined relative speed.
In another aspect the invention provides an apparatus to screen and agitate an oil sand slurry (9), comprising a main frame (8), an intermediate frame (7), lower and upper springs (2 and 3), a vibration means in the form of an eccentric drive (1), two or more screening sections (4, 5, 6) of decreasing inclination in the direction of material flow, one or more agitation zones (17) between the screen decks, vertical screens (16) in the agitation zone, water spray bars (18) in the agitation zones (17) .
The oil sand slurry comprising oil sand and water enters the screen in the feed end and forms a material bed. The material bed consisting of oil sand slurry is accelerated by eccentric drives in the direction of the desired material flow due to the pre-determined throw angle. The amplitude of this acceleration is adjustable. The angle of this acceleration is predefined. The oil sand slurry passes over and through a series of alternating means to screen and agitate the oil sand slurry in order to screen out the undersize particles of the oil sand slurry. Oversize particles will be discharged at the discharge end of the screen.
To overcome potential plugging of the feed end, due to the sticky cohesive behavior of said material bed, the first screen section has a high inclination, to allow for a high relative speed between the oil sand slurry and the screen deck. The following screen or screens in direction of the material flow have successively decreasing inclinations in order to successively increase the retention time of the oil sand slurry on the screen deck.
By defining the relative speeds and thus the inclination of said screen sections a maximum screening efficiency can be achieved while simultaneously avoiding the feed end of the screen to be plugged. Said inclinations of said respective screening means are preferrably between 10 and 20 degrees relative to a horizontal plane.
To overcome said reduction of screening efficiency due to the sticky cohesive behavior of the oil sand slurry and the said material bed that forms due to the sticky cohesive behavior agitating means are introduced between two following screen sections.
An agitation zone is a zone between the discharge end of a screen section and the feed end of the following screen section, seen in direction of material flow, where said discharge end is higher in elevation than said feed end of said following screen section, allowing for the material to be in free fall. Furthermore spray bars 18 might be placed above the agitation zone to spray water on the oil sand slurry being in free fall in the agitation zone. Said water impinges on said falling material bed to improve the agitation of said oil sand slurry. Said material bed, agitated by said free fall and by said water from said water spray bars 18 , eventually falls on the feed end of the following screen section and breaks up furthermore. Said agitation zone 17 is an integral part of the process or the apparatus.
Furthermore the substantially vertical screen sections 16 might be equipped with holes 25 allowing for immediate screening of the agitated material in the agitation zone 17. Said immediate screening through said holes 25 of said substantial vertical screen section 16 furthermore avoids a pile up or pocket of said oil sand slurry in the agitation zone 17.
Such a pile up or pocket might form a surface, on which the material might slide, from the discharge end of one screen section to the feed end of a following screen section instead of allowing for free fall, what is required to allow for agitation.
Claims (14)
1. In the field of mining, an improved series of process steps to prepare an oil sand slurry containing particles of a predetermined maximum size, employing the process steps of:
(a) receiving an oil sand slurry from a primary mixing means;
(b) forming a material bed which travels over a first screening means and a separate subsequent second screening means, wherein said oil sand slurry falls in a free fall from the first screening means downwardly to the second screening means;
(c) conducting a first screening process at a relative velocity between the oil sand slurry and the first screening means;
(d) conducting a second screening process at a relative velocity between the oil sand slurry the second screening means, which relative velocity in said second screening process is lower than said relative velocity in said first screening process;
(e) a process step between the first and the second screening processes, wherein a water spray is directed onto the particles which are in downward free fall from said first screening means onto said second screening means.
(a) receiving an oil sand slurry from a primary mixing means;
(b) forming a material bed which travels over a first screening means and a separate subsequent second screening means, wherein said oil sand slurry falls in a free fall from the first screening means downwardly to the second screening means;
(c) conducting a first screening process at a relative velocity between the oil sand slurry and the first screening means;
(d) conducting a second screening process at a relative velocity between the oil sand slurry the second screening means, which relative velocity in said second screening process is lower than said relative velocity in said first screening process;
(e) a process step between the first and the second screening processes, wherein a water spray is directed onto the particles which are in downward free fall from said first screening means onto said second screening means.
2. The process as claimed in claim 1, further comprising :
(a) adding additional screening processes at a predetermined relative velocity between the oil sand slurry and additional screening means, each having a relative velocity which is lower than the velocity in the preceding screening processes, to achieve different retention times; and (b) adding a process step between the preceding and the subsequent respective screening process where the oil sand slurry is in free fall from a preceding screening means to a subsequent screening means, wherein a water spray is directed onto the particles which are in downward free fall from said preceding screening means onto said subsequent screening means.
(a) adding additional screening processes at a predetermined relative velocity between the oil sand slurry and additional screening means, each having a relative velocity which is lower than the velocity in the preceding screening processes, to achieve different retention times; and (b) adding a process step between the preceding and the subsequent respective screening process where the oil sand slurry is in free fall from a preceding screening means to a subsequent screening means, wherein a water spray is directed onto the particles which are in downward free fall from said preceding screening means onto said subsequent screening means.
3. The process as claimed in any one of claim l or 2, further comprising the step of providing porous vertical sections where said oil sand slurry is in said free fall, and directing said water spray on said oil sand slurry to cause further screening.
4. In the field of mining an improved apparatus to prepare an oil sand slurry, containing particles with a predetermined maximum size, comprising:
(a) means for receiving an oil sand slurry from a primary mixing means, (b) means to allow the slurry to form a material bed, (c) first screening means, said material bed when passing over said first screening means having a first relative velocity between the material bed and the first screening means;
(d) second screening means , said material bed when passing over said second screening means having a second relative velocity between the material bed and the second screening means, said second relative velocity being lower than said first relative velocity; and (e) a free fall zone between the first and the second screening means where the oil sand slurry in the material bed passes in free fall from said first screening means to said second screening means; and (f) a water spray apparatus for directing a water spray onto said oil sand slurry in said free fall zone.
(a) means for receiving an oil sand slurry from a primary mixing means, (b) means to allow the slurry to form a material bed, (c) first screening means, said material bed when passing over said first screening means having a first relative velocity between the material bed and the first screening means;
(d) second screening means , said material bed when passing over said second screening means having a second relative velocity between the material bed and the second screening means, said second relative velocity being lower than said first relative velocity; and (e) a free fall zone between the first and the second screening means where the oil sand slurry in the material bed passes in free fall from said first screening means to said second screening means; and (f) a water spray apparatus for directing a water spray onto said oil sand slurry in said free fall zone.
5. The apparatus of Claim 4 , further comprising :
(a) additional screening means, each having a predetermined relative velocity between the material bed and the additional screening means, said relative velocity being lower than the relative velocity on a preceding screening means; and (b) a further free fall zone between each of a preceding and subsequent screening means, where when the material bed passes in free fall from said preceding screening means to said subsequent screening means, and a water spray apparatus is provided for directing a water spray onto said material bed in said further free fall zone.
(a) additional screening means, each having a predetermined relative velocity between the material bed and the additional screening means, said relative velocity being lower than the relative velocity on a preceding screening means; and (b) a further free fall zone between each of a preceding and subsequent screening means, where when the material bed passes in free fall from said preceding screening means to said subsequent screening means, and a water spray apparatus is provided for directing a water spray onto said material bed in said further free fall zone.
6. The apparatus as claimed in any one of claims 4 or 5, further having porous vertical sections in said free fall zone, and said water spray is adapted to be directed on said material bed in free fall and cause further screening of said material bed via said porous vertical sections.
7. The apparatus as claimed in any one of claims 4, 5, or 6, wherein said relative velocities are achieved by different inclinations of respective screening means.
8. The apparatus as claimed in claim 7, wherein said inclinations of said respective screening means are between 10 and 20 degrees relative to a horizontal plane.
9. The apparatus as claimed in claim 4, further having vibration means to periodically accelerate each of said first and second screening means.
10. The apparatus as claimed in claim 9, wherein said different first and second relative velocities are achieved by said vibration means by providing different accelerations of the respective first and second screening means.
11. The apparatus as claimed in any one of claims 4 to 10, wherein a distance where said oil sand slurry falls from said first screening means to said second screening means in said free fall zone is sufficient to allow impact of said particles falling on said second screening means to provide further disintegration of larger particles in said oil sand slurry into smaller particles.
12. The apparatus as claimed in claim 11, wherein said disintegration of larger particles into smaller particles in said free fall zone is assisted by said water spray.
13. The apparatus as claimed in any one of claims 4-12, wherein said primary mixing means is a rotating vessel, fed with oil sand and water.
14. In the field of mining an improved apparatus to prepare an oil sand slurry, containing particles with a predetermined maximum size, comprising:
(a) means for receiving an oil sand slurry from a primary mixing means, (b) means to allow the slurry to form a material bed, (c) first screening means, having vibratory means so as to cause or assist in causing said material bed when passing over said first screening means to have a first relative velocity between the material bed and the first screening means;
(d) second screening means, having vibratory means so as to cause or assist in causing said material bed when passing over said second screening means to have a second relative velocity between the material bed and the second screening means, said second relative velocity being lower than said first relative velocity; and (e) a free fall zone between the first and the second screening means where the oil sand slurry in the material bed passes downwardly in free fall from said first screening means to said second screening means, having porous vertical sections in said free fall zone; and (f) a water spray apparatus for directing a water spray onto said oil sand slurry in said five fall zone, and cause further screening of said material bed via said porous vertical sections in said free fall zone.
(a) means for receiving an oil sand slurry from a primary mixing means, (b) means to allow the slurry to form a material bed, (c) first screening means, having vibratory means so as to cause or assist in causing said material bed when passing over said first screening means to have a first relative velocity between the material bed and the first screening means;
(d) second screening means, having vibratory means so as to cause or assist in causing said material bed when passing over said second screening means to have a second relative velocity between the material bed and the second screening means, said second relative velocity being lower than said first relative velocity; and (e) a free fall zone between the first and the second screening means where the oil sand slurry in the material bed passes downwardly in free fall from said first screening means to said second screening means, having porous vertical sections in said free fall zone; and (f) a water spray apparatus for directing a water spray onto said oil sand slurry in said five fall zone, and cause further screening of said material bed via said porous vertical sections in said free fall zone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2615587A CA2615587C (en) | 2007-12-20 | 2007-12-20 | Process and apparatus to screen and prepare an oil sand slurry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2615587A CA2615587C (en) | 2007-12-20 | 2007-12-20 | Process and apparatus to screen and prepare an oil sand slurry |
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| CA2615587A1 CA2615587A1 (en) | 2009-06-20 |
| CA2615587C true CA2615587C (en) | 2016-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108787432A (en) * | 2018-06-11 | 2018-11-13 | 黄素兰 | Filter sand device for building |
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| CN103785605A (en) * | 2014-03-12 | 2014-05-14 | 于国泉 | High-frequency electromagnetism sieve for ceramic industry and using method thereof |
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| CN112140337A (en) * | 2020-09-23 | 2020-12-29 | 周伟 | Cement mixing plant for interior decoration |
| CN112791948A (en) * | 2021-01-29 | 2021-05-14 | 中国水利水电第九工程局有限公司 | Anti-blocking self-dewatering high-frequency wet screening device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108787432A (en) * | 2018-06-11 | 2018-11-13 | 黄素兰 | Filter sand device for building |
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| CA2615587A1 (en) | 2009-06-20 |
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