CA1246324A - Method and apparatus for obtaining a suspension and/or a solution of a powdered limestone in water - Google Patents
Method and apparatus for obtaining a suspension and/or a solution of a powdered limestone in waterInfo
- Publication number
- CA1246324A CA1246324A CA000464661A CA464661A CA1246324A CA 1246324 A CA1246324 A CA 1246324A CA 000464661 A CA000464661 A CA 000464661A CA 464661 A CA464661 A CA 464661A CA 1246324 A CA1246324 A CA 1246324A
- Authority
- CA
- Canada
- Prior art keywords
- grating
- water
- suspension
- powder
- limestone powder
- 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
Links
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Abstract The present invention relates to a method to obtain a suspension and/or a solution of limestone powder in water. The limestone powder is placed on a grating (7) of such a mesh size that only a negligible quantity of the powder by itself passes through the grating (7). The grating (7) is sprayed from underneath with water from several nozzles (10) so positioned that the main part of the surface of the grating (7) is sprayed. At least a part of the water passes by this through the grating (7), loosens and/or dissolves the powdered lime-stone and carries this with it when the water runs back through the grating (7). The water and the suspended and/or dissolved limestone powder in it are collected under the grating (7).
Description
~z~,3;2~1 Method and appara~us f4r ob~aining a suspension andtor a solution of a powdered limestone in water This invention relates to a method for obtaining a suspension and/or d solution of limestone powder form in water, whereby the limestone powder is placed on a grating of such a mesh size that only a negliyible quantity of the powder runs by itself through the grating and whereby the grating is sprayed from underneath with water so that the water thereby loosens and/or dissolves the powder and carries this with it when the water runs back through the grating, whereafter the water with the suspended and/or dissolved limestone powder is collected under the grating.
The invention also relakes to an aparatus which works according to the method of the invention. Such an apparatus comprlces a tank in which the suspension occurs, and means for distribution of the llmestone powder, the water, and the suspension to and from the tank, which has at the top an opening for loading of the limestone powder and, is divided into an upper and lower chamber by a horizontally positioned grating~
It is know~that lime is used to raise the pH value of acidified lakes and water streams. 8y using lime in dust or powder form it is accomplished, in part, that the lime sinks slowly to the bottom and, in part, that the lime has an as large exposed area as possible with the water. Both these factors act together for the good utilization of the lime.
A drawback with spreading the lime in powder form is that the lime powder can be carried out by the wind over the area that one does not wish to lime.
Spreading out the lime suspended or dissolved in water has been tried in order to obtain d more directed spreading. Another reason for suspending the lime in water before it is spread Ollt is that the dissolution process from lime to carbonate begins earlier than in the ``` ~ Z~L63~
case with spreading of dry lime powder. In this way a further improved benefit of the lime is obtalned~ a more exact determination of required lime quantity can be made and thus savings with respect to both lime quantity and spreading resources can be obtained.
It is true that apparatus, for mixing of d powdered material and a liquid are already known, but such apparatus are not specially constructed for the case where the powdered material is lirne. It has also been shown that these known apparatus do not function totally satisfactorily.
The object of the present invention is thus primarily to effect d method for suspending and/or dissolving limestone powder in water and this is accomplished, by that the water is sprayed from a plurality of nozzles positioned so that the main part of the surface of the grating is sprayed under mainly equal conditions.
An apparatus which works according to the method of the invention is characterized in, that into the lower chamber protrude several nozzles pointed at the grating arranged to spray liquid under pressure against the grating, and that in the center of the bottom of the tank is an opening for draining of the suspension.
The invention shall be further described in the following with refe-rence to the accompanying drawinq on which Figure 1 shows one and Figure 2 another embodiment of an apparatus in accordance with the invention. Such an apparatus can be placed stationary by a waterbody with moving water or be mobilized on a barge or on a ~loat specially built for the purpose.
An apparatus which works according to the method of the invention consists of a tank 1 with a center cylindrical part 2, an upper conical part 3 and a lower, half spherical part 4. In the tip of the conical part 3 is an opening to which a suction apparatus 5 with a suction hose 6 are connected. The tank 1 is divided by a horizontally positioned grating or net 7 into an upper cha~ber 8, composed of sections 2 and 3, and a lower chamber 9, composed of section 4. The 632~
net 7 lies in its place on thin positioned bedms 18. Into the lower chamber 9 protrude several nozzles 10 pointed at the grating 7 which are connected with the pressure side of d pump 12 by hoses l1. The nozzles 10 are pointed so that they together cover the main part of the surface of the grating 7 and are especially positioned concentrically around a çentrally placed drainage opening in the bottom of the half spherical chamber 4, which is connected with the suction side of a pump 14 by d pipe 13. The suction side of the pump 12 is meant to be connected to a water source by a pipe 15 and the pressure side of the pump 14 is connected by a pipe 16 with a nozzle not shown in the drawing. Over the drainage opening is positioned a cap 17 which covers the opening from above but allows free access from the sides.
The apparatus of the invention works in the following way: limestone powder 19 is loaded into the upper chamber 8 as indicated by arrows 20. The powder is taken with the help of the suction apparatus 5 through the hose 6 from a store room or the like in which limestone powder is possibly stored in so-called large sacks each holding about 500 kg. Alternatively the cone shaped part 3 can be inverted and used as a hopper, in which case the suction apparatus 5 and the pipe 6 become superfluous because the large sacks can be empt1ed directly into the hopper.
The limestone powder is held on the grating 7, which has such a mesh size that only a negligible quantity runs through this by itself down into the lower chamber 9. Water is pumped under pressure by pump 12, indicated with an arrow 21~ through ~he nozzles 10 in the form of jets 22 against the grating 7. The water ~n the Jets penetrates through the grating 7 and takes with it limestone powder in the form of lime suspension when it runs by gravity back through the grating 7 and down into the lower chamber 9. The lime suspension collected in the lower chamber 9 is pumped out ~n stages by the pump 14 and is sprayed out over the water body whose pH value shall be raised as indicated by an arrow 23.
In the embodiment according to Figure 2 in which corresponding or ;3%4L
identical parts of the apparatus has the same reference numerals as in Figure 1, mainly the spraying means are different from the nozxles 10 of the apparatus showed in Figure 1. The spraying means comprizes three concentric ringshaped tubes 24, 25, 26 each of different dia-meter and with a plurality of nozzle openings 27 distributed over their upper sides. The tupe 24 which is interconnected to d central nozzle 28, is connected via a valve 29 to the pressure pump 12. The tubes 25 and 26 are interconnected and are also connected, via a valve 30 to the pump 12 1~
The advantage of the embodiment of the spraying means according to Figure 2 is that a more even distribution of water over the surface of the grating 7 is achieved. By means of the valves 29, 30 it is also possible to change the concentration of powdered limestone in the water with respect to the pH-value of the water and to the waterdepth.
It is obvious that the method and the apparatus of the invention should not be considered to be limited to the above described utili-zation, but can be used generally for suspending and/or dissolving a powdered material in a liquid.
The invention also relakes to an aparatus which works according to the method of the invention. Such an apparatus comprlces a tank in which the suspension occurs, and means for distribution of the llmestone powder, the water, and the suspension to and from the tank, which has at the top an opening for loading of the limestone powder and, is divided into an upper and lower chamber by a horizontally positioned grating~
It is know~that lime is used to raise the pH value of acidified lakes and water streams. 8y using lime in dust or powder form it is accomplished, in part, that the lime sinks slowly to the bottom and, in part, that the lime has an as large exposed area as possible with the water. Both these factors act together for the good utilization of the lime.
A drawback with spreading the lime in powder form is that the lime powder can be carried out by the wind over the area that one does not wish to lime.
Spreading out the lime suspended or dissolved in water has been tried in order to obtain d more directed spreading. Another reason for suspending the lime in water before it is spread Ollt is that the dissolution process from lime to carbonate begins earlier than in the ``` ~ Z~L63~
case with spreading of dry lime powder. In this way a further improved benefit of the lime is obtalned~ a more exact determination of required lime quantity can be made and thus savings with respect to both lime quantity and spreading resources can be obtained.
It is true that apparatus, for mixing of d powdered material and a liquid are already known, but such apparatus are not specially constructed for the case where the powdered material is lirne. It has also been shown that these known apparatus do not function totally satisfactorily.
The object of the present invention is thus primarily to effect d method for suspending and/or dissolving limestone powder in water and this is accomplished, by that the water is sprayed from a plurality of nozzles positioned so that the main part of the surface of the grating is sprayed under mainly equal conditions.
An apparatus which works according to the method of the invention is characterized in, that into the lower chamber protrude several nozzles pointed at the grating arranged to spray liquid under pressure against the grating, and that in the center of the bottom of the tank is an opening for draining of the suspension.
The invention shall be further described in the following with refe-rence to the accompanying drawinq on which Figure 1 shows one and Figure 2 another embodiment of an apparatus in accordance with the invention. Such an apparatus can be placed stationary by a waterbody with moving water or be mobilized on a barge or on a ~loat specially built for the purpose.
An apparatus which works according to the method of the invention consists of a tank 1 with a center cylindrical part 2, an upper conical part 3 and a lower, half spherical part 4. In the tip of the conical part 3 is an opening to which a suction apparatus 5 with a suction hose 6 are connected. The tank 1 is divided by a horizontally positioned grating or net 7 into an upper cha~ber 8, composed of sections 2 and 3, and a lower chamber 9, composed of section 4. The 632~
net 7 lies in its place on thin positioned bedms 18. Into the lower chamber 9 protrude several nozzles 10 pointed at the grating 7 which are connected with the pressure side of d pump 12 by hoses l1. The nozzles 10 are pointed so that they together cover the main part of the surface of the grating 7 and are especially positioned concentrically around a çentrally placed drainage opening in the bottom of the half spherical chamber 4, which is connected with the suction side of a pump 14 by d pipe 13. The suction side of the pump 12 is meant to be connected to a water source by a pipe 15 and the pressure side of the pump 14 is connected by a pipe 16 with a nozzle not shown in the drawing. Over the drainage opening is positioned a cap 17 which covers the opening from above but allows free access from the sides.
The apparatus of the invention works in the following way: limestone powder 19 is loaded into the upper chamber 8 as indicated by arrows 20. The powder is taken with the help of the suction apparatus 5 through the hose 6 from a store room or the like in which limestone powder is possibly stored in so-called large sacks each holding about 500 kg. Alternatively the cone shaped part 3 can be inverted and used as a hopper, in which case the suction apparatus 5 and the pipe 6 become superfluous because the large sacks can be empt1ed directly into the hopper.
The limestone powder is held on the grating 7, which has such a mesh size that only a negligible quantity runs through this by itself down into the lower chamber 9. Water is pumped under pressure by pump 12, indicated with an arrow 21~ through ~he nozzles 10 in the form of jets 22 against the grating 7. The water ~n the Jets penetrates through the grating 7 and takes with it limestone powder in the form of lime suspension when it runs by gravity back through the grating 7 and down into the lower chamber 9. The lime suspension collected in the lower chamber 9 is pumped out ~n stages by the pump 14 and is sprayed out over the water body whose pH value shall be raised as indicated by an arrow 23.
In the embodiment according to Figure 2 in which corresponding or ;3%4L
identical parts of the apparatus has the same reference numerals as in Figure 1, mainly the spraying means are different from the nozxles 10 of the apparatus showed in Figure 1. The spraying means comprizes three concentric ringshaped tubes 24, 25, 26 each of different dia-meter and with a plurality of nozzle openings 27 distributed over their upper sides. The tupe 24 which is interconnected to d central nozzle 28, is connected via a valve 29 to the pressure pump 12. The tubes 25 and 26 are interconnected and are also connected, via a valve 30 to the pump 12 1~
The advantage of the embodiment of the spraying means according to Figure 2 is that a more even distribution of water over the surface of the grating 7 is achieved. By means of the valves 29, 30 it is also possible to change the concentration of powdered limestone in the water with respect to the pH-value of the water and to the waterdepth.
It is obvious that the method and the apparatus of the invention should not be considered to be limited to the above described utili-zation, but can be used generally for suspending and/or dissolving a powdered material in a liquid.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Method to obtain a suspension and/or a solution of limestone powder form in water, whereby the limestone powder is placed on a grating of such a mesh size that only a negligible quantity of the powder runs by itself through the grating and whereby the grating is sprayed from underneath with water so that the water thereby loosens and/or dissolves the powder and carries this with it when the water runs back through the grating,whereafter the water with the suspended and/or dissolved limestone powder is collected under the grating, characterized in that the water is sprayed from a plurality of nozzles positioned so that the main part of the surface of the grating is sprayed under substantially equal conditions.
2. Apparatus for obtaining a suspension and/or a solution of limestone powder in water comprising a tank in which the suspen-sion occurs, and means for distribution of the limestone powder, the water, and the suspension to and from the tank, which has at the top an opening for loading of the limestone powder and is divided into an upper and lower chamber by a horizontally positioned grating characterized in that into the lower chamber protrude several nozzles pointed at the grating and arranged to spray the surface of the grating under substantially equal con-ditions, and that in the center of the bottom of the tank is an opening for draining of the suspension.
3. Apparatus for obtaining a limestone powder suspension and/or a solution in water comprising a tank in which the suspension occurs, and means for distribution of the limestone powder, the water, and the suspension to and from the tank, which has at the top an opening for loading of the limestone powder and is divided into an upper and lower chamber by a horizontally positioned grating characterized in that into the lower chamber protrude several nozzles pointed at the grating and arranged to spray the surface of the grating under substantially equal conditions, the spray being arranged to penetrate the grating and to suspend in the penetrating water limestone powder held above the grating, and that in the center of the bottom of the tank is an opening for draining of the water-limestone suspension.
4. Apparatus according to either one of claims 2 and 3, characterized in that the nozzles are positioned concentrically around the drainage opening.
5. Apparatus according to either one of claims 2 and 3, characterized in that between the grating and the drainage opening, close to the latter, is positioned a cap which covers the opening from above, but allows free access from the sides.
6. Method to obtain a suspension and/or a solution of lime-stone powder form in water, whereby the limestone powder is placed on a grating of such a mesh size that only a negligible quantity of the powder runs by itself through the grating and whereby the grating is sprayed from underneath with water so that the water thereby loosens and/or dissolves the powder and carries this with it when the water runs back through the grating, whereafter the water with the suspended and/or dissolved lime-stone powder is collected under the grating, characterized in that the water is sprayed from a plurality of nozzles positioned so that the main part of the surface of the grating is sprayed under substantially equal positions, where the method is carried out in an apparatus comprising a tank in which the suspension occurs, and means for distribution of the limestone powder, the water, and the suspension to and from the tank, which has at the top an opening for loading of the limestone powder and is divided into an upper and lower chamber by a horizontally positioned grating wherein that into the lower chamber protrude several nozzles pointed at the grating and arranged to spray the surface of the grating under substantially equal conditions, and that in the center of the bottom of the tank is an opening for draining of the suspension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464661A CA1246324A (en) | 1984-10-03 | 1984-10-03 | Method and apparatus for obtaining a suspension and/or a solution of a powdered limestone in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464661A CA1246324A (en) | 1984-10-03 | 1984-10-03 | Method and apparatus for obtaining a suspension and/or a solution of a powdered limestone in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1246324A true CA1246324A (en) | 1988-12-13 |
Family
ID=4128838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000464661A Expired CA1246324A (en) | 1984-10-03 | 1984-10-03 | Method and apparatus for obtaining a suspension and/or a solution of a powdered limestone in water |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1246324A (en) |
-
1984
- 1984-10-03 CA CA000464661A patent/CA1246324A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |