CA2615587A1 - 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
- Publication number
- CA2615587A1 CA2615587A1 CA002615587A CA2615587A CA2615587A1 CA 2615587 A1 CA2615587 A1 CA 2615587A1 CA 002615587 A CA002615587 A CA 002615587A CA 2615587 A CA2615587 A CA 2615587A CA 2615587 A1 CA2615587 A1 CA 2615587A1
- Authority
- CA
- Canada
- Prior art keywords
- screening
- oil sand
- material bed
- relative velocity
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003027 oil sand Substances 0.000 title claims abstract description 55
- 239000002002 slurry Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 33
- 239000000463 material Substances 0.000 claims abstract description 63
- 238000012216 screening Methods 0.000 claims abstract description 51
- 238000013019 agitation Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims description 8
- 238000005065 mining Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 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
- 239000004576 sand Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 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
- 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
A Vibrating Screen to form, agitate and screen a bed of oil sand slurry to prepare it for hydro transport and reduce the amount of oversize, having a frame and a screen body supported on springs, directional oscillating movements being imparted to the screen body by a motor powered vibrating mechanism. The screen body comprises 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
7 This invention relates to ore processing. In particular, this invention relates to a process 8 and an apparatus to screen and prepare oil sand slurry for being pumped through a pipe 9 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 11 invention.
Oil sand mining and processing equipment technology is unique to the deposits found in 16 Northern Alberta, Canada, in terms of the evolution of process equipment suitable for 17 mining and processing the oil sand ore. In the oil sand mine, equipment used to excavate 18 and transport the run-of-mine (ROM) oil sand ore is as large in scale as at any worldwide 19 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 21 ROM oil sand ore to a centralized oil sand slurry preparation facility.
23 Due to the massive scale of the mining equipment and the characteristics of the 24 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 26 millimeter diameter. The ROM oil-sand ore typically contains up to 15 %
free water, 6%
27 to 18 % bitumen and 75 % to 85 % solids of which 95 % is sand content by weight and also 28 contains amounts of siltstone rock having an unconfined compressive strength of 165 to 29 221 MPa as a waste component.
31 The harsh environmental conditions at oil-sand operations encompass an ambient 32 temperature range from +35 degrees Celsius down to -51 degrees Celsius.
Materials 33 handling properties of the ROM ore are highly variable over this temperature range. The 34 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 36 bitumen components.
38 A slurry preparation process step is typically required to prepare all ROM
ore to be 39 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 41 ROM oil sand ore. Typical prerequisites for efficient slurry pumping are crushing and 42 screening the oil sand ore to a maximum lump size of e.g. 100 mm followed by the 43 preparation of a homogeneous water slurry, typically with a consistency of about 64 %
44 solids by weight at a slurry specific gravity of appr. 1.5.
Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 2 of I 1 1 In a typical oil sand preparation process a step of screening the oil sand slurry is required 2 to ensure the predefined maximum particle size. The processes and machines currently in 3 use were taken from conventional screening processes and machines that were developed 4 to process dry material, e.g. gravel, sand, crushed stone, etc. Due to the requirement of processing a wet oil sand slurry difficulties arise.
7 Disadvantages of the prior art of processes and machines to screen and prepare an oil 8 sand slurry lead to a lower screening efficiency resulting in a higher reject rate. Rejected 9 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.
12 Using prior art technology results in a material bed on the screen that is of high viscosity 13 due to the defined addition of water. Within this material bed the oil sand will stick 14 together and will not fall through the 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 16 screened. The material in the upper area will stick together as a material bed and will not 17 be subject to being screened. Due to the sticky cohesive behavior the feed section of the 18 screen might get plugged frequently.
DESCRIPTION OF DRAWINGS
21 Figure 1 shows the cross section of a typical arrangement of a vibrating screen. The 22 vibrating screen consists of a main frame (8), an intermediate frame (7), springs (3) 23 between the frames (7 and 8), springs (2) between the intermediate frame and the 24 foundation, an excentric drive (1) 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 26 agitation of the oil sand. The oil sand slurry (9) is fed to the screen in the feed end section 27 (20) and forms a material bed. After the discharge section of the first screen (22) the 28 material enters the agitation zone (17) and drops down onto the feed section of the second 29 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 31 oversize material is leaving the screen through the oversize discharge section (21). The 32 screen decks have decreasing inclinations al on the first screening section (4), a2 on the 33 second screening section (5), and a3 on the third screening section (6), seen in the 34 direction of the material flow.
36 Figure 2 shows the material bed of the oil sand slurry on the screen (19) representing any 37 of the screen sections (4), (5), or (6) as it will build up during the process of screening. A
38 lower part of the material bed (14) comprising the oil sand slurry is subject to screening, 39 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 41 the oil sand slurry.
43 Figure 3 shows an agitation zone (17) which is placed between two following screening 44 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 Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 3 of 11 1 agitation zones, improving the agitation. Substantially vertical screen decks (16) allow 2 undersize material (11) to be screened out in the agitation zone.
4 Figure 4 illustrate the process of receiving the oil sand slurry, screening said slurry at a pre-defined inclination al and speed vl, agitating the material and screening it again at a 6 pre-defined inclination a2 and speed V2, where the inclination of the screen sections and 7 the relative speeds of the material is decreasing seen in the direction of the material flow.
Oil sand mining and processing equipment technology is unique to the deposits found in 16 Northern Alberta, Canada, in terms of the evolution of process equipment suitable for 17 mining and processing the oil sand ore. In the oil sand mine, equipment used to excavate 18 and transport the run-of-mine (ROM) oil sand ore is as large in scale as at any worldwide 19 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 21 ROM oil sand ore to a centralized oil sand slurry preparation facility.
23 Due to the massive scale of the mining equipment and the characteristics of the 24 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 26 millimeter diameter. The ROM oil-sand ore typically contains up to 15 %
free water, 6%
27 to 18 % bitumen and 75 % to 85 % solids of which 95 % is sand content by weight and also 28 contains amounts of siltstone rock having an unconfined compressive strength of 165 to 29 221 MPa as a waste component.
31 The harsh environmental conditions at oil-sand operations encompass an ambient 32 temperature range from +35 degrees Celsius down to -51 degrees Celsius.
Materials 33 handling properties of the ROM ore are highly variable over this temperature range. The 34 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 36 bitumen components.
38 A slurry preparation process step is typically required to prepare all ROM
ore to be 39 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 41 ROM oil sand ore. Typical prerequisites for efficient slurry pumping are crushing and 42 screening the oil sand ore to a maximum lump size of e.g. 100 mm followed by the 43 preparation of a homogeneous water slurry, typically with a consistency of about 64 %
44 solids by weight at a slurry specific gravity of appr. 1.5.
Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 2 of I 1 1 In a typical oil sand preparation process a step of screening the oil sand slurry is required 2 to ensure the predefined maximum particle size. The processes and machines currently in 3 use were taken from conventional screening processes and machines that were developed 4 to process dry material, e.g. gravel, sand, crushed stone, etc. Due to the requirement of processing a wet oil sand slurry difficulties arise.
7 Disadvantages of the prior art of processes and machines to screen and prepare an oil 8 sand slurry lead to a lower screening efficiency resulting in a higher reject rate. Rejected 9 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.
12 Using prior art technology results in a material bed on the screen that is of high viscosity 13 due to the defined addition of water. Within this material bed the oil sand will stick 14 together and will not fall through the 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 16 screened. The material in the upper area will stick together as a material bed and will not 17 be subject to being screened. Due to the sticky cohesive behavior the feed section of the 18 screen might get plugged frequently.
DESCRIPTION OF DRAWINGS
21 Figure 1 shows the cross section of a typical arrangement of a vibrating screen. The 22 vibrating screen consists of a main frame (8), an intermediate frame (7), springs (3) 23 between the frames (7 and 8), springs (2) between the intermediate frame and the 24 foundation, an excentric drive (1) 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 26 agitation of the oil sand. The oil sand slurry (9) is fed to the screen in the feed end section 27 (20) and forms a material bed. After the discharge section of the first screen (22) the 28 material enters the agitation zone (17) and drops down onto the feed section of the second 29 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 31 oversize material is leaving the screen through the oversize discharge section (21). The 32 screen decks have decreasing inclinations al on the first screening section (4), a2 on the 33 second screening section (5), and a3 on the third screening section (6), seen in the 34 direction of the material flow.
36 Figure 2 shows the material bed of the oil sand slurry on the screen (19) representing any 37 of the screen sections (4), (5), or (6) as it will build up during the process of screening. A
38 lower part of the material bed (14) comprising the oil sand slurry is subject to screening, 39 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 41 the oil sand slurry.
43 Figure 3 shows an agitation zone (17) which is placed between two following screening 44 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 Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 3 of 11 1 agitation zones, improving the agitation. Substantially vertical screen decks (16) allow 2 undersize material (11) to be screened out in the agitation zone.
4 Figure 4 illustrate the process of receiving the oil sand slurry, screening said slurry at a pre-defined inclination al and speed vl, agitating the material and screening it again at a 6 pre-defined inclination a2 and speed V2, where the inclination of the screen sections and 7 the relative speeds of the material is decreasing seen in the direction of the material flow.
8 Undersize material that has been screened out will be fed to the pump box.
Oversize 9 material will be rejected.
11 Figure 5 shows a similar process comprising the process illustrated in Figure 4 with an 12 additional screening section and an additional agitation zone.
16 In one aspect the invention provides a process to screen and agitate an oil sand slurry, 17 employing the process steps of receiving an oil sand slurry, forming a material bed, 18 screening the oil sand slurry at a predefmed relative speed.
In another aspect the invention provides an apparatus to screen and agitate an oil sand 21 slurry (9), comprising a main frame (8), an intermediate frame (7), lower and upper 22 springs (2 and 3), an eccentric drive (1), two or more screening sections (4, 5, 6) of 23 decreasing inclination in the direction of material flow, one or more agitation zones (17) 24 between the screen decks, vertical screens (16) in the agitation zone, water spray bars (18) in the agitation zones (17) .
27 The oil sand slurry comprising oil sand and water enters the screen in the feed end and 28 forms a material bed. The material bed consisting of oil sand slurry is accelerated by 29 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 31 acceleration is predefined. The oil sand slurry passes over and through a series of 32 alternating means to screen and agitate the oil sand slurry in order to screen out the 33 undersize particles of the oil sand slurry. Oversize particles will be discharged at the 34 discharge end of the screen.
36 To overcome potential plugging of the feed end, due to the sticky cohesive behavior of 37 said material bed, the first screen section has a high inclination, to allow for a high 38 relative speed between the oil sand slurry and the screen deck. The following screen or 39 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.
41 By defining the relative speeds and thus the inclination of said screen sections a 42 maximum screening efficiency can be achieved while simultaneously avoiding the feed 43 end of the screen to be plugged.
To overcome said reduction of screening efficiency due to the sticky cohesive behavior 46 of the oil sand slurry and the said material bed that forms due to the sticky cohesive Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 4 of 11 1 behavior agitating means are introduced between two following screen sections. An 2 agitation zone is a zone between the discharge end of a screen section and the feed end of 3 the following screen section, seen in direction of material flow, where said discharge end 4 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 might be placed above the agitation 6 zone to spray water on the oil sand slurry being in free fall in the agitation zone. Said 7 water impinges on said falling material bed to improve the agitation of said oil sand 8 slurry. Said material bed, agitated by said free fall and by said water from said water 9 spray bars, eventually falls on the feed end of the following screen section and breaks up furthermore. Said agitation zone is an integral part of the process or the apparatus.
12 Furthermore the substantially vertical screen sections might be equipped with holes 13 allowing for immediate screening of the agitated material in the agitation zone. Said 14 immediate screening through said holes of said substantial vertical screen section furthermore avoids a pile up or pocket of said oil sand slurry in the agitation zone. Such a 16 pile up or pocket might form a surface, on which the material might slide, from the 17 discharge end of one screen section to the feed end of a following screen section instead 18 of allowing for free fall, what is required to allow for agitation.
Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 5 of 11
Oversize 9 material will be rejected.
11 Figure 5 shows a similar process comprising the process illustrated in Figure 4 with an 12 additional screening section and an additional agitation zone.
16 In one aspect the invention provides a process to screen and agitate an oil sand slurry, 17 employing the process steps of receiving an oil sand slurry, forming a material bed, 18 screening the oil sand slurry at a predefmed relative speed.
In another aspect the invention provides an apparatus to screen and agitate an oil sand 21 slurry (9), comprising a main frame (8), an intermediate frame (7), lower and upper 22 springs (2 and 3), an eccentric drive (1), two or more screening sections (4, 5, 6) of 23 decreasing inclination in the direction of material flow, one or more agitation zones (17) 24 between the screen decks, vertical screens (16) in the agitation zone, water spray bars (18) in the agitation zones (17) .
27 The oil sand slurry comprising oil sand and water enters the screen in the feed end and 28 forms a material bed. The material bed consisting of oil sand slurry is accelerated by 29 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 31 acceleration is predefined. The oil sand slurry passes over and through a series of 32 alternating means to screen and agitate the oil sand slurry in order to screen out the 33 undersize particles of the oil sand slurry. Oversize particles will be discharged at the 34 discharge end of the screen.
36 To overcome potential plugging of the feed end, due to the sticky cohesive behavior of 37 said material bed, the first screen section has a high inclination, to allow for a high 38 relative speed between the oil sand slurry and the screen deck. The following screen or 39 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.
41 By defining the relative speeds and thus the inclination of said screen sections a 42 maximum screening efficiency can be achieved while simultaneously avoiding the feed 43 end of the screen to be plugged.
To overcome said reduction of screening efficiency due to the sticky cohesive behavior 46 of the oil sand slurry and the said material bed that forms due to the sticky cohesive Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 4 of 11 1 behavior agitating means are introduced between two following screen sections. An 2 agitation zone is a zone between the discharge end of a screen section and the feed end of 3 the following screen section, seen in direction of material flow, where said discharge end 4 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 might be placed above the agitation 6 zone to spray water on the oil sand slurry being in free fall in the agitation zone. Said 7 water impinges on said falling material bed to improve the agitation of said oil sand 8 slurry. Said material bed, agitated by said free fall and by said water from said water 9 spray bars, eventually falls on the feed end of the following screen section and breaks up furthermore. Said agitation zone is an integral part of the process or the apparatus.
12 Furthermore the substantially vertical screen sections might be equipped with holes 13 allowing for immediate screening of the agitated material in the agitation zone. Said 14 immediate screening through said holes of said substantial vertical screen section furthermore avoids a pile up or pocket of said oil sand slurry in the agitation zone. Such a 16 pile up or pocket might form a surface, on which the material might slide, from the 17 discharge end of one screen section to the feed end of a following screen section instead 18 of allowing for free fall, what is required to allow for agitation.
Process and Apparatus to Screen and Prepare an Oil Sand Slurry Page 5 of 11
Claims (12)
SLURRY
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. In the field of mining an improved series of process steps to prepare an oil sand slurry, containing particles with 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, (c) first screening process at a predetermined relative velocity between the material bed and the first screening means, having a relative velocity which is higher than the relative velocity in the following screening steps, (d) second screening process at a predetermined relative velocity between the material bed and the second screening means, which is lower than the speed in the first screening step, to achieve a high retention time, (e) a process step between the first and the second screening process, where the material is in free fall, where the free fall allows for improved agitation of the material bed.
2. The process of Claim 1 being modified by (a) adding more screening processes at a predetermined relative velocity between the material bed and the according screening means, having a relative velocity which is lower than the velocity in the preceding screening step, to achieve different retention times, (b) adding process steps between the preceding and the respective screening process, where the material is in free fall, where the free fall allows for improved agitation of the material bed.
3. In the field of mining an improved series of process equipment 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 forming a material bed, (c) first screening means to allow for a predetermined relative velocity between the material bed and the first screening means, having a relative velocity which is higher than the relative velocity on the following screening means, (d) second screening means at a predetermined relative velocity between the material bed and the second screening means, which is lower than the speed in the first screening step, to achieve a high retention time, (e) a step between the first and the second screening means, where the material is in free fall, where the free fall allows for improved agitation of the material bed.
4. The apparatus of Claim 3 being modified by (a) having additional screening means allowing a predetermined relative velocity between the material bed and the according screening means, having a relative velocity which is lower than the velocity on the preceding screening means, to achieve different retention times, (b) having additional means between the preceding and the respective screening means, to allow for the material to be in free fall, where the free fall allows for improved agitation of the material bed.
5. Said apparatus of Claim 3 or Claim 4 wherein the different and predetermined relative velocities are achieved by different inclinations of the screening means.
6. Said apparatus of Claim 3, 4 or 5 wherein said inclinations of screening means are between 10 and 20 degrees relative to the horizontal plane.
7. Said apparatus of either Claims 3 to 6 wherein the screening process is supported by vibration means to periodically accelerate the screening means.
8. Said apparatus of Claim 7 wherein said different and predetermined relative velocities are achieved by different accelerations of the screening means.
9. Said apparatus of either Claims 3 to 8 wherein the said agitation of said material bed on said means between the preceding and the respective screening deck, to allow for the material to be in free fall, is improved by means to impact the falling material bed.
10. Said apparatus of Claim 9 wherein the said means to impact the falling material bed is realized by means to spray water to improve the agitation of said material bed.
11. Said apparatus of either Claims 3 to 10 wherein the said primary mixing means will be a rotating vessel, fed with oil sand and water, prior to said slurry being received by said means for receiving an oil sand slurry from a primary mixing means.
12. Said apparatus of either Claims 3 to 10 wherein the said primary mixing means will be a rotating vessel, fed with oil sand, water, and a substance to improve the process of creating an oil sand slurry, prior to said slurry being received by said means for receiving an oil sand slurry from a primary mixing means.
Priority Applications (1)
| 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 |
Applications Claiming Priority (1)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2615587A1 true CA2615587A1 (en) | 2009-06-20 |
| CA2615587C CA2615587C (en) | 2016-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2615587A Active CA2615587C (en) | 2007-12-20 | 2007-12-20 | Process and apparatus to screen and prepare an oil sand slurry |
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| CA (1) | CA2615587C (en) |
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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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