DE102011106470A1 - Introducing alkaline substances in acidic water, comprises e.g. carrying out thermal activation of chalk- or dolomite milk to be used, and introducing water via a pumping device into an injector combined with a mixing pump - Google Patents

Abstract

Introducing alkaline substances in acidic water, comprises (a) carrying out thermal activation of chalk- or dolomite milk to be used, (b) introducing water via a pumping device at a rate of 5-150 m 3>/hour into an injector combined with a mixing pump, (c) introducing an alkaline feedstock from a silo vehicle, quicklime or quicklime dolomite in an amount of 1-30 t/h through the injector combined with the mixing pump, and (d) carrying out deletion operation of burnt lime or burnt dolomite to produce lime- or dolomite milk. Introducing alkaline substances in acidic water, comprises (a) carrying out thermal activation of chalk- or dolomite milk to be used, (b) introducing water via a pumping device at a rate of 5-150 m 3>/hour into an injector combined with a mixing pump, (c) introducing an alkaline feedstock from a silo vehicle, quicklime or quicklime dolomite in an amount of 1-30 t/h through the injector combined with the mixing pump, and (d) carrying out deletion operation of burnt lime or burnt dolomite (1-30 t/h in the pipeline extending from an injector or a mixing device up to a mixing pump, and in the mixing pump, with supplied water (5-150 m 3>/h) to produce lime- or dolomite milk, which is adjusted to a temperature of the produced thermally activated lime- or dolomite milk, preferably to 40-100[deg] C by adjusting the ratio of water and burnt lime or burnt dolomite to 1:3-1: 10, where the thermally activated lime or dolomite milk (10-30 wt.%) produced in the mixing pump, is carried out using a high pressure pump as a positive displacement pump (in a total amount of 5-160 m 3>and at a pressure of 5-150 bar), via a floating distributing line into the corresponding water, and/or directed into the container of a floating water treatment plant, and introduced into the corresponding water via the container during the motion of the floating distributing line into the water bodies. An independent claim is also included for a device for carrying out the above method, comprising at least one silo vehicle with a pneumatic discharge device, at least one injector, at least one flexible pipeline between the silo vehicle and the injector, at least one water inlet for the injector, at least one pipeline between the injector and the mixing pump or direct coupling of the injector and the mixing pump, at least one mixing pump with an integrated or combined mixing chamber, a screw conveyor and the high pressure pump executed as a positive displacement pump e.g. piston-, screw-, hose- and rotor pump, at least one temperature measuring device, at least one quantity measuring device for liquids, at least one floating or movable pipeline with outlet openings, at least one distributing line in water, and/or a mobile water treatment plant with storage and distributing devices.

Description

The invention relates to a method and apparatus for introducing alkaline substances into acidic waters for the neutralization and aftertreatment of these waters, in particular of so-called Bergbaufolgeseen, which have a high acidity and the influx of acidic groundwater streams of long-lasting treatment with respect to the maintenance of neutral water conditions require.

By flooding with surface waters, the acidification can be counteracted. At high acidity or flooding of already partially filled open pit mines, the low neutralization potential of surface water is insufficient and the lakes remain in an acid state without additional treatment.

It is known from the prior art to selectively neutralize acidic waters by liming, for example at a sea outlet. The liming is practiced here in mine water treatment plants. However, the lake remains in an acidified condition and can not be used economically and touristically.

From the prior art is also known that with the use of so-called in-lake process, a start neutralization and the treatment of such waters are possible.

So is in DE 199 61 243 A1 a method described after resuming the existing in an opencast mining lake flushed power plant ash, which are derived from the combustion of lignite and sedimented at the bottom of an opencast mining lake, and to use via pipelines in acid remainder lake for neutralization. However, this method is of limited use if old ash is present in the water or is available nearby. The reactivity of such ashes is relatively low, so that the cost of equipment is not justifiable for cost reasons.

According to another method DE 10157342.1 acidic sulphate-rich waters are to be influenced by the use of treated dolomite in combination with substances containing carbonate and / or bicarbonate and / or carbon dioxide. The disadvantage of multistep processes with different starting materials is a higher plant outlay, longer treatment times, a higher monitoring effort with a total of high overall costs

Another procedure by file number DE 103 04 009.9 aims at using alkali technology suspended substances from a silo with water and distribute this suspension with elaborate distribution facilities up to 2000 m in length so that as much of the substance used in the lake is converted into alkalinity and thus achieved a high efficiency in the substance conversion becomes. However, the costs of such a method are in many cases unreasonable, so that it has hardly ever been used. In http://www.ldl.sachsen.de/de/internet/service/umweltinfos/files/tienz.pdf on page 31/32 a system combination is described in which burnt lime from a permanently installed silo in a separate extinguishing container is extinguished and then diluted in a separate dilution tank and then applied via two lines on the sea surface to neutralize the seawater. This process is very complex from the plant and control technology and required about 2.5 a for the treatment of a lake. The change of the plant location to another lake is associated with high costs and high expenditure of time.

In the DE 20 2007 017 852 U1 is a self-propelled watercraft for introducing alkaline substances into waters described, which has reservoir for alkaline substances, water suction device, metering device for suspension production, feed pump and distribution nozzles for spraying the suspension. In the proposed plant, the alkaline products are added to the suction side of the delivery unit, whereby problems in the use of calcined lime products due to dislocation phenomena occur and can lead to malfunction.

The object of the invention is to find a method and a device for introducing alkaline substances into acidic waters, which are suitable to effectively introduce burned lime products with a high specific power with low investment in acidic waters.

According to the invention, the object as set forth in the claims, thereby achieved by a thermally activated lime or dolomite milk is produced, being conveyed via a pumping device 5 to 150 m ³ / h of water via a combined with a mixing pump injector and at the same time from a silo vehicle fine-grained quicklime or fine-grained Branntdolomit be promoted with a grain size of <0.1 mm in an amount of 1 to 30 t / h to an injector, which is combined with a mixing pump and the thermally activated lime or dolomite milk is introduced into an acidic waters ,

According to the invention, this injector is connected via a pipeline or directly to a mixing pump, wherein in the pipeline to a Mixing pump and / or in this mixing pump the extinguishing process of quicklime or Branntdolomit with supplied water in producing lime or dolomite milk is such that the temperature of the produced lime or dolomite milk by adjusting the ratio of water to quicklime or Branntdolomit of 1: 3 to 1 : 10 is set to 40 to 100 ° C.

In carrying out the process, the lime or dolomitic milk produced in the mixing pump is treated with a high pressure pump designed as a positive displacement pump in a concentration of 10 to 30%, in a total amount of 5 to 160 m ³ / h and at a pressure of 5 to 150 bar passed through a movable floating distribution line in the relevant body of water and / or in the container of a floating water treatment plant and introduced via this into the body of water when moving the same on or under the water surface.

The feeding of the 40 to 100 ° C hot lime or dolomite milk to the positive displacement pump can be supported in the implementation of the method, preferably with a metering screw in the mixing pump.

According to the invention, the temperature setting of the lime or dolomite milk produced at 40 to 100 ° C via the solids and water dosage.

The method can be carried out in an embodiment variant that the 40 to 100 ° C hot lime or dolomite milk is fed into the reservoir of a mobile floating water treatment plant and introduced via this into the water.

• – mindestens ein Silofahrzeug mit pneumatischer Austragsvorrichtung,
• – mindestens ein Injektor,
• – mindestens eine flexible Rohrleitung zwischen Silofahrzeug und einem Injektor,
• – mindestens eine Wasserzuführung zum Injektor,
• – mindestens eine Rohrleitung zwischen Injektor und Mischpumpe oder Direktkopplung von Injektor und Mischpumpe,
• – mindestens eine Mischpumpe mit integriertem/kombinierten Mischraum, Förder-/Vorpressschnecke und Hochdruckpumpe, ausgeführt als Verdrängerpumpe wie Kolben-, Schnecken, Schlauch- oder Rotorpumpe,
• – mindestens eine Temperaturmessung,
• – mindestens eine Mengenmessung für Flüssigkeiten,
• – mindestens eine schwimmende/bewegliche Rohrleitung mit Auslassöffnungen unter und/oder über der Wasseroberfläche,
• – mindestens eine Verteilleitung im Gewässer und/oder eine mobile Wasserbehandlungsanlage mit Lager und Verteileinrichtungen.

According to the invention, the device for carrying out the method consists of the following system parts:

• At least one silo vehicle with pneumatic discharge device,
• At least one injector,
• - at least one flexible pipeline between the silo vehicle and an injector,
• At least one water supply to the injector,
• At least one pipeline between injector and mixing pump or direct coupling of injector and mixing pump,
• - at least one mixing pump with integrated / combined mixing chamber, conveying / pre-pressing screw and high-pressure pump, designed as a displacement pump such as piston, screw, hose or rotor pump,
• At least one temperature measurement,
• At least one quantity measurement for liquids,
• At least one floating / movable pipeline with outlet openings below and / or above the water surface,
• - At least one distribution line in the water and / or a mobile water treatment plant with storage and distribution facilities.

By increasing the temperature of the lime and / or dolomitic milk produced to 40 to 100 ° C, it is achieved that the fine-grained lime and / or dolomite particles are further reduced in granularity, the specific surface is increased by> 30% and the reactivity is increased by> 30%. is increased compared to the state without increasing the temperature.

By the proposed method and apparatus, the process of Branntkalklöschens can be significantly simplified, since the usual stationary equipment such as solid silo, extinguishing containers and maturing containers with extensive measuring and control and dosing omitted and the overall process for solving the problem of the invention significantly simplified becomes.

• – effektiver Einsatz von gebrannten Kalk-/Dolomitprodukten für die Seewasserbehandlung ist möglich,
• – hoher Wirkungsgrad
• – Hohe Mobilität der beweglichen Anlagenausrüstung,
• – Geringe Kosten für die Aufstellung und den Betrieb der Anlagen,
• – Hohe spezifische Einsatzstoffmengen und geringer Zeitaufwand für Behandlungsmaßnahmen.

Durch den Eintrag der heißen Kalk- oder Dolomitmilch wird erreicht, dass bei Aufbringen auf dem Gewässer eine längere Verweilzeit auf der Gewässeroberfläche mit verbesserter Verteilung und Erhöhung des Reaktionswirkungsgrad bewirkt wird. Bei Eintrag unter der Wasseroberfläche erfolgt neben einem Ausströmimpuls ein zusätzlicher Wärmeenergieimpuls mit zusätzlicher Verteilwirkung in Richtung Wasseroberfläche.The proposed method and apparatus have the following further advantages:

• - effective use of calcined lime / dolomite products for seawater treatment is possible,
• - High efficiency
• - high mobility of mobile equipment,
• - low costs for installation and operation of the facilities,
• - High specific input quantities and short time for treatment measures.

By introducing the hot lime or dolomite milk is achieved that when applied to the water a longer residence time on the surface of the water with improved distribution and increase the reaction efficiency is effected. When entering below the water surface, in addition to a Ausströmimpuls an additional heat energy pulse with additional distribution effect towards the water surface.

With the help of the proposed method, the treatment of hostile acidic waters, such as for opencast mining lakes for recreation, management and as a cache with a relatively small amount of time and low cost.

The principle of the invention will be explained in more detail in the following example.

An _{opencast mine} with a volume of 30 million m ³ contains acidic water with a pH of 3.0 and a k _{b7.0 value} of 3.0 mmol / l.

For the neutralization of the water body is, assuming an efficiency of 90% based on the feedstock quicklime with a grain size of <0.09 mm, a quantity of 2,800 t required.

• – Silofahrzeug mit pneumatischer Austragsvorrichtung zum Anliefern und Fördern von Branntkalk,
• – flexible Rohrleitung vom Silofahrzeug zum Injektor,
• – 1 Pumpe zum Ansaugen von 40 m³/h Wasser aus dem See,
• – Injektor zur Zusammenführung von Branntkalk und Wasser,
• – Eine Mischpumpe ausgeführt als Kolbenpumpe mit Vorpressschnecke,
• – Temperaturmessungen vor und nach Mischpumpe,
• – Mengenmessungen für Feststoff und Wasser,
• – Rohrleitung (DN 100; Länge 300 m),
• – Verteileinrichtungen (24 Düsen mit 20 mm Durchmesser),
• – Auftriebskörper für die schwimmende Verlagerung der Rohrleitung auf dem See,
• – Stromerzeuger (Notstromaggregat),
• – Anker, Bojen usw..

The method and apparatus for introducing alkaline substances into acid waters are designed as a mobile device to ensure an effective and rapid realization of the proposed method and consist of the following equipment:

• - Silo vehicle with pneumatic discharge device for delivering and conveying quicklime,
• - flexible piping from the silo vehicle to the injector,
• - 1 pump to draw 40 m ³ / h of water from the lake,
• - injector for combining quicklime and water,
• - A mixing pump designed as a piston pump with pre-compression screw,
• Temperature measurements before and after the mixing pump,
• - quantity measurements for solid and water,
• - pipeline (DN 100, length 300 m),
• Distribution devices (24 nozzles with 20 mm diameter),
• Buoyancy body for the floating displacement of the pipeline on the lake,
• - Generator (emergency generator),
• - anchors, buoys etc ..

From a silo vehicle 10 t / h quicklime are conveyed by means of a pneumatic discharge device to an injector. In the injector 40 m ³ / h of water, which are fed with a pressure of 8 bar from the lake to an injector, mixed with 10 t / h quicklime and passed to a mixing pump, which is designed as a piston pump with pre-auger. Due to the exothermic reaction of quenching lime, the temperature of the milk of lime produced after the injector in the mixing pump increases to 80 ° C. In this reaction, the quicklime particles are digested and are much more reactive than before this treatment.

By means of a piston pump, the 80 ° C hot milk of lime is introduced at a pressure of 50 bar through a 300 m long floating polyethylene pipe with an internal diameter of 100 mm into the water via 24 nozzles with a diameter of 20 mm into the water. These nozzles are arranged in the last 30 m at the end of the line on both sides at a distance of 2 m at an angle to the water surface of 45 °. The pipeline is graduated at the end in diameter, so that approximately the flow rate remains the same to the last pair of nozzles.

A silo vehicle contains about 25 tons of quicklime, so every two and a half hours the silo vehicle is changed. When changing the water metering remains in operation to avoid dislocations in the piping system.

In a two-shift operation, 150 tonnes of burnt lime are added daily to the water to be treated with high efficiency. After 20 working days, the pH in the water is set to 7.

With the help of the realized process solution, the treatment of the open-pit mine is possible in a simple and economical way. A technical solution was found with which a preservation or improvement of the quality of large amounts of water in acidic lakes with the use of quicklime or Branntdolomit in a simple manner with high effectiveness is possible and the basics for the Nachnutzungsziele can be created much faster and more sustainable.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19961243 A1 [0005]
• DE 10157342 [0006]
• DE 10304009 [0007]
• DE 202007017852 U1 [0008]

Cited non-patent literature

• http://www.ldl.sachsen.de/en/internet/service/umweltinfos/files/tienz.pdf on page 31/32 [0007]

Claims (5)

Method and apparatus for introducing alkaline substances into acidic waters, characterized in that a thermal activation of the lime / dolomite milk to be used is carried out and the process proceeds according to the following steps: - 5 m ³ / h to 150 m ³ / h via a pumping device Water is conveyed to an injector combined with a mixing pump, - an alkaline vehicle, burnt lime or burntolomite in an amount of 1 t / h to 30 t / h is conveyed via an injector combined with a mixing pump, - in the pipeline from the injector / Mixing device up to a mixing pump and in the mixing pump, the extinguishing operation of 1 to 30 t / h quicklime or Branntdolomit with 5 m ³ / h to 150 m ³ / h of supplied water in the production of lime or dolomite milk, by adjusting the ratio Water to quicklime or Branntdolomit of 1: 3 to 1:10 to a temperature of the generated thermally activated Kalk- od he thermally activated lime or dolomite milk produced in the mixing pump is in a concentration of 10 to 30% by mass, in a total amount of 5 to 160 m ³ and with a high pressure pump designed as a positive displacement pump passed with a pressure of 5 to 150 bar via a floating distribution line in the relevant body of water and / or in the container of a floating water treatment plant and introduced via this into the water concerned when moving the same on the water. A method according to claim 1, characterized in that the temperature setting of the lime or dolomite milk produced is carried out at 40 to 100 ° C via the solids and water dosage. A method according to claim 1 and 2, characterized in that the supply of 40 to 100 ° C hot lime or dolomitic milk to the positive displacement pump is supported with a metering / Vorpressschnecke in the mixing pump. A method according to claim 1 to 3, characterized in that the 40 to 100 ° C hot lime or dolomite milk is fed into the reservoir of a mobile floating water treatment plant and introduced via this into the water. Device for carrying out the method, characterized in that the device, At least one silo vehicle with pneumatic discharge device, At least one injector, - at least one flexible pipeline between the silo vehicle and an injector, At least one water supply to the injector, At least one pipeline between injector and mixing pump or direct coupling of injector and mixing pump, - at least one mixing pump with integrated / combined mixing chamber, screw conveyor and high-pressure pump, designed as a displacement pump such as piston, screw, hose or rotor pump, At least one temperature measurement, At least one quantity measurement for liquids, At least one floating / movable pipeline with outlet openings, - at least one distribution pipe in the water and / or a mobile water treatment plant with storage and distribution facilities, having.