CA1220396A - Mineral slurries - Google Patents
Mineral slurriesInfo
- Publication number
- CA1220396A CA1220396A CA000439306A CA439306A CA1220396A CA 1220396 A CA1220396 A CA 1220396A CA 000439306 A CA000439306 A CA 000439306A CA 439306 A CA439306 A CA 439306A CA 1220396 A CA1220396 A CA 1220396A
- Authority
- CA
- Canada
- Prior art keywords
- particles
- weight
- mineral
- mineral particles
- slurry
- 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.)
- Expired
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- Liquid Carbonaceous Fuels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Mineral Slurries A pumpable slurry of mineral particles, e.g., coal, in water contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water. The mineral component contains at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, 10 to 40% by weight of fine particles having a particle size less than 200 micron and the balance to 100% of intermediate sized particles.
The slurry is stable without the use of additives and can be pumped through a pipeline.
Mineral Slurries A pumpable slurry of mineral particles, e.g., coal, in water contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water. The mineral component contains at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, 10 to 40% by weight of fine particles having a particle size less than 200 micron and the balance to 100% of intermediate sized particles.
The slurry is stable without the use of additives and can be pumped through a pipeline.
Description
I 5367 (2) MINERAL SLURRIES
This invention relates to a pump able slurry of particles of a mineral such as coal in water and to a method for transporting such a slurry.
There have been previous proposals to transport coal by preparing slurries of particles of coal in water and pumping the slurries through pipelines. These slurries tend to be Instable and the coal tends to sediment.
GO 2068056-A discloses a method of transporting coal as a coal water slurry through a pipeline wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 micron and at most 10% by weight of coal particles having a particle size smaller than 44 micron.
There have also been proposals to provide slurries of coal particles in water for use as fuels. However, such slurries are based on even finer particles.
It is an object of the present invention to provide a pump able slurry of improved stability containing relatively large size mineral particles in water.
According to the present invention there is provided a pump able slurry of mineral particles in water comprising coarse mineral particles having a particle size in the range 5 to 50 mm and fine mineral particles having a size less than 200 micron wherein the slurry contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water, at least 30% by weight of the mineral particles being in the form of coarse
This invention relates to a pump able slurry of particles of a mineral such as coal in water and to a method for transporting such a slurry.
There have been previous proposals to transport coal by preparing slurries of particles of coal in water and pumping the slurries through pipelines. These slurries tend to be Instable and the coal tends to sediment.
GO 2068056-A discloses a method of transporting coal as a coal water slurry through a pipeline wherein the coal in the slurry comprises at least 95% by weight of coal particles having a particle size smaller than 700 micron and at most 10% by weight of coal particles having a particle size smaller than 44 micron.
There have also been proposals to provide slurries of coal particles in water for use as fuels. However, such slurries are based on even finer particles.
It is an object of the present invention to provide a pump able slurry of improved stability containing relatively large size mineral particles in water.
According to the present invention there is provided a pump able slurry of mineral particles in water comprising coarse mineral particles having a particle size in the range 5 to 50 mm and fine mineral particles having a size less than 200 micron wherein the slurry contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water, at least 30% by weight of the mineral particles being in the form of coarse
2 ~;~2~3~
particles, 10~ to 40~ by weight being in the form of fine particles, and the balance to 100% by weight being intermediate sized particles.
Above 85% by weight, the slurry becomes too viscous to be pumped and below 50% the slurry is unstable and suspended particles settle out.
Preferably the slurry contains owe to 80% by weight of mineral particles.
Preferably the fine particles contain a significant proportion, erg at least 50~ by weight, of particles less than 100 micron in size.
Desirably the fine particles have a low content, ego less than 10% by weight of particles less than 10 microns in size as these tend to increase the viscosity of the slurry, although some at least should be present.
Conveniently the mineral particles have a continuous particle size distribution. This may be chosen to obtain the closest packing of particles.
The preferred mineral for use in a slurry according to the present invention is coal, but coal waste and ores of copper, nickel and gold sure also suitable.
A slurry according to the present invention has a high viscosity when static and a low viscosity after shearing and in motion. It is stable without requiring the addition of a 25 stabilizer. The flow of slurry can be stopped, started and the velocity altered at will without causing sedimentation of coarse particles or pipeline blockage.
According to another aspect of the present invention, there is provided a method for transporting a pump able slurry of mineral particles in water through a pipeline which method comprises pumping a slurry as herein before described through the pipeline.
It is believed that in motion the fine particles concentrate at the wall of the pipeline and the coarse particles at the core. The fines at the pipeline wall act as a lubricant for the coarse particles at the core.
I
The pipelines may be primed with a slurry of the fines to prevent difficulties in starting up.
Conveniently the fines may be separated at the distant end of the pipeline and returned to the near end for reuse.
Separation may be effected by diluting the slurry with further quantities of water to reduce its stability followed by filtration and/or centrifuging.
The fines can be returned as a slurry in water through another pipeline. Conveniently the loading of fines in the returned slurry is about 50-65~ by weight.
According to a further aspect of the invention there it provided a mineral in the form of a pump able slurry as herein before described, wherein the mineral comprises at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, based on the total weight of mineral particles, 10 to 40~ by weight of fine particles having a particle size less than 200 micron, and the balance to 100% by weight of intermediate sized particles.
The invention is illustrated with reference to the following example.
Example A 1:1 by weight mixture of pulverized Grime Thorpe coal fines (particle size less than 100 micron) and water was slurries in a cement mixer. Two parts by weight unwashed Coventry coal (particle size in the range 5 to 50 mm) were then mixed in.
The resulting slurry was then pumped under non-turbulent flow conditions through R 100 m long 8 inch diameter (20.32 cm) pipeline using a Putzmeister BRA 211 concrete pump.
Samples of the slurry were taken from the pipeline at the times indicated in Table 1 and 2 and the particle size distribution of the sample was determined and recorded in Table 2.
The example shows that a slurry according to the present invention can be pumped under conditions of non-turbulent flow and the slurry is stable and pump able without the use of additives such as surfactants which have previously been proposed to prevent aggregation of coal particles.
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Flow Delivery Wall Tire 5 Velocity Pressure Shear Stress (m/s) (Barnum) 0.62 I 387 10-45 0.47 8.25 400 11-05 0.74 9.2 447 11-10 0.70 4.6 217 11-30 1.01 6.1 292 11-35 0.51 7.1 342 12-17 1.05 9.7 472 12-25 0.68 5.4 257 12-32 0.68 5.0 237 12-33 0.68 4.0 187 12-35 0.~l8 3.0 1~7 12-38 0.68 2.5 112 12-41 0.68 2.0 87 12-43 0.68 1.5 62 12-46 0.68 1.5 62 13-20 0.68 1.0 37 13-23 0.68 0.5 15 13-29 0,51 4.6 217 14-56 0.51 4.75 224 15-05 0.51 4.95 235 15-30 0.51 5.10 242 15-48 0.51 5.6 267 15-55 0.51 5.6 267 15-55 I
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particles, 10~ to 40~ by weight being in the form of fine particles, and the balance to 100% by weight being intermediate sized particles.
Above 85% by weight, the slurry becomes too viscous to be pumped and below 50% the slurry is unstable and suspended particles settle out.
Preferably the slurry contains owe to 80% by weight of mineral particles.
Preferably the fine particles contain a significant proportion, erg at least 50~ by weight, of particles less than 100 micron in size.
Desirably the fine particles have a low content, ego less than 10% by weight of particles less than 10 microns in size as these tend to increase the viscosity of the slurry, although some at least should be present.
Conveniently the mineral particles have a continuous particle size distribution. This may be chosen to obtain the closest packing of particles.
The preferred mineral for use in a slurry according to the present invention is coal, but coal waste and ores of copper, nickel and gold sure also suitable.
A slurry according to the present invention has a high viscosity when static and a low viscosity after shearing and in motion. It is stable without requiring the addition of a 25 stabilizer. The flow of slurry can be stopped, started and the velocity altered at will without causing sedimentation of coarse particles or pipeline blockage.
According to another aspect of the present invention, there is provided a method for transporting a pump able slurry of mineral particles in water through a pipeline which method comprises pumping a slurry as herein before described through the pipeline.
It is believed that in motion the fine particles concentrate at the wall of the pipeline and the coarse particles at the core. The fines at the pipeline wall act as a lubricant for the coarse particles at the core.
I
The pipelines may be primed with a slurry of the fines to prevent difficulties in starting up.
Conveniently the fines may be separated at the distant end of the pipeline and returned to the near end for reuse.
Separation may be effected by diluting the slurry with further quantities of water to reduce its stability followed by filtration and/or centrifuging.
The fines can be returned as a slurry in water through another pipeline. Conveniently the loading of fines in the returned slurry is about 50-65~ by weight.
According to a further aspect of the invention there it provided a mineral in the form of a pump able slurry as herein before described, wherein the mineral comprises at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, based on the total weight of mineral particles, 10 to 40~ by weight of fine particles having a particle size less than 200 micron, and the balance to 100% by weight of intermediate sized particles.
The invention is illustrated with reference to the following example.
Example A 1:1 by weight mixture of pulverized Grime Thorpe coal fines (particle size less than 100 micron) and water was slurries in a cement mixer. Two parts by weight unwashed Coventry coal (particle size in the range 5 to 50 mm) were then mixed in.
The resulting slurry was then pumped under non-turbulent flow conditions through R 100 m long 8 inch diameter (20.32 cm) pipeline using a Putzmeister BRA 211 concrete pump.
Samples of the slurry were taken from the pipeline at the times indicated in Table 1 and 2 and the particle size distribution of the sample was determined and recorded in Table 2.
The example shows that a slurry according to the present invention can be pumped under conditions of non-turbulent flow and the slurry is stable and pump able without the use of additives such as surfactants which have previously been proposed to prevent aggregation of coal particles.
~L22~3~
Flow Delivery Wall Tire 5 Velocity Pressure Shear Stress (m/s) (Barnum) 0.62 I 387 10-45 0.47 8.25 400 11-05 0.74 9.2 447 11-10 0.70 4.6 217 11-30 1.01 6.1 292 11-35 0.51 7.1 342 12-17 1.05 9.7 472 12-25 0.68 5.4 257 12-32 0.68 5.0 237 12-33 0.68 4.0 187 12-35 0.~l8 3.0 1~7 12-38 0.68 2.5 112 12-41 0.68 2.0 87 12-43 0.68 1.5 62 12-46 0.68 1.5 62 13-20 0.68 1.0 37 13-23 0.68 0.5 15 13-29 0,51 4.6 217 14-56 0.51 4.75 224 15-05 0.51 4.95 235 15-30 0.51 5.10 242 15-48 0.51 5.6 267 15-55 0.51 5.6 267 15-55 I
or o _ ox on o J o on on c) I on on ED
I. o I on o cry O I c~J _ _ _ _ ox o I o o on ox I o Jo . 0 o Lo o _ on o _ on on _ o _ I o _ on on _ I _ co _ us . It _ o _ o O I
Jo O O ED 00 a Jo I It o _ Jo on _ I> I ED
æ
I I JO I I ,. CO
ELI I. I -- O I O O
: us o _ o I on Jo on on o I
ox I
I r_ o n --to o on Cal I cry o _, on I ox ox ED
z ¢ ¢ I. _ It O I ED O Ox --I eel ox on ox o ox o on _ I o Jo or Jo on ) o _ o I I. Jo _ ox ox It a) ox o a on Pi _ Lo ox ED o Jo I
Pi Jo ¢ JO O I 0 Jo O n on ¢ I I. El on cry _ on Jo _ ox o I
z a on Lo Lo Lo I
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o o o o o o o o o o o o on o Q O O O O O O O O O O
O O O O O O 0 0` 0 0 0 0 O O O O O O O O O O O O
a on on o o I on on ox on I O _ _ LO Lo Lo 13 l l l l l l l l l l l l Ed O -- _ _ I Lo us _, _, _ _ _ _ . . _, _ _ _ _ _
Claims (10)
1. A pumpable slurry of mineral particles in water comprising coarse mineral particles having a particle size in the range 5 to 50 mm and fine mineral particles having a particle size less than 200 micron wherein the slurry contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water, at least 30% by weight of the mineral particles being in the form of coarse particles, 10% to 40% by weight being in the form of fine particles and the balance to 100% by weight being intermediate sized particles.
2. A pumpable slurry according to claim 1 wherein the slurry contains 65% to 80% by weight of mineral particles.
3. A pumpable slurry according to claim 1 wherein at least 50% by weight of the fine particles are less than 100 micron in size.
4. A pumpable slurry according to claim 1 wherein the fine particles contain less than 10% by weight of particles having a particle size below 10 micron.
5. A pumpable slurry according to claim 1 wherein the mineral particles have a continuous particle size distribution.
6. A pumpable slurry according to claim 1 wherein the slurry consists essentially of mineral particles and water and does not contain any added stabiliser.
7. A pumpable slurry according to claim 1 wherein the mineral particles are coal particles.
8. A method for transporting mineral particles in water through a pipeline which method comprises pumping through the pipeline a pumpable slurry of mineral particles in water comprising coarse mineral particles having a particle size in the range 5 to 50 mm and fine mineral particles having a particle size less than 200 micron wherein the slurry contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water, at least 30% by weight of the mineral particles being in the form of coarse particles, 10 to 40% by weight being in the form of fine particles and the balance to 100% by weight being intermediate sized particles.
9. A method for transporting a pumpable slurry of mineral particles in water through a pipeline according to claim 8 wherein the fine particles are separated from the slurry at the distant end of the pipeline and are returned for re-use.
10. A mineral in the form of particles suitable for dispersion in water to form a pumpable slurry wherein the mineral comprises at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, based on the total weight of mineral particles, 10 to 40% by weight of fine particles having a particle size less than 200 micron, and the balance to 100% by weight of intermediate sized particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439306A CA1220396A (en) | 1983-10-19 | 1983-10-19 | Mineral slurries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000439306A CA1220396A (en) | 1983-10-19 | 1983-10-19 | Mineral slurries |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1220396A true CA1220396A (en) | 1987-04-14 |
Family
ID=4126322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000439306A Expired CA1220396A (en) | 1983-10-19 | 1983-10-19 | Mineral slurries |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1220396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456859A (en) * | 2022-01-17 | 2022-05-10 | 神华准格尔能源有限责任公司 | Preparation method of raw material coal water slurry rich in high-aluminum ash and preparation method of high-aluminum ash |
-
1983
- 1983-10-19 CA CA000439306A patent/CA1220396A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456859A (en) * | 2022-01-17 | 2022-05-10 | 神华准格尔能源有限责任公司 | Preparation method of raw material coal water slurry rich in high-aluminum ash and preparation method of high-aluminum ash |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |