US20130187087A1 - Process for lime slurry production - Google Patents

Process for lime slurry production Download PDF

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Publication number
US20130187087A1
US20130187087A1 US13/355,872 US201213355872A US2013187087A1 US 20130187087 A1 US20130187087 A1 US 20130187087A1 US 201213355872 A US201213355872 A US 201213355872A US 2013187087 A1 US2013187087 A1 US 2013187087A1
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United States
Prior art keywords
polymeric dispersant
lime
water
mixture
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.)
Abandoned
Application number
US13/355,872
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English (en)
Inventor
Clarence Scheurman, III
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Applied Specialties Inc
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Applied Specialties Inc
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Publication date
Application filed by Applied Specialties Inc filed Critical Applied Specialties Inc
Priority to US13/355,872 priority Critical patent/US20130187087A1/en
Assigned to APPLIED SPECIALTIES, INC. reassignment APPLIED SPECIALTIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHEURMAN III, CLARENCE
Priority to MX2014008868A priority patent/MX356941B/es
Priority to AU2012367236A priority patent/AU2012367236B2/en
Priority to CA2861443A priority patent/CA2861443C/en
Priority to JP2014553285A priority patent/JP2015509901A/ja
Priority to EP12769531.0A priority patent/EP2807127A1/en
Priority to CN201280067900.7A priority patent/CN104185614A/zh
Priority to PCT/US2012/054803 priority patent/WO2013112204A1/en
Priority to BR112014018052-0A priority patent/BR112014018052B1/pt
Publication of US20130187087A1 publication Critical patent/US20130187087A1/en
Priority to ZA2014/05014A priority patent/ZA201405014B/en
Priority to IN5793DEN2014 priority patent/IN2014DN05793A/en
Priority to CO14158668A priority patent/CO7111309A2/es
Priority to US14/812,205 priority patent/US9309151B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/02—Lime
    • C04B2/04—Slaking
    • C04B2/06—Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness
    • C02F5/06—Softening water by precipitation of the hardness using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/02—Lime
    • C04B2/04—Slaking
    • C04B2/08—Devices therefor

Definitions

  • the present invention is directed generally to a method of preparing an alkaline-neutralizing agent.
  • the present method described herein may provide a reduction in the alkaline chemical usage as well as a reduction in equipment scaling.
  • Alkaline-neutralizing agents may be, for example, caustic solutions or lime slurries.
  • Lime slurries can commonly be used in a water-softening process called “lime softening” where lime causes ‘hardness’ ions to precipitate from and settle out of solution, thus softening the water.
  • lime slurries instead of conventional caustic (often prepared from sodium hydroxide, or “NaOH”) solutions to adjust the pH of, or to neutralize acidic solutions on a commercial, municipal, and/or industrial scale.
  • an alkaline chemical may be required.
  • An alkaline chemical (those chemicals having a pH greater than 7) may be a chemical like NaOH or lime.
  • caustic solutions can be used. These high-concentration caustic solutions (for example, about 50% NaOH with the balance as water) can be typically used for many of these applications due to the difficulty in handling lime and its traditional slurries, described in summary below.
  • caustic solutions can be highly dangerous and must be carefully controlled to ensure that humans do not come into contact with these solutions, which can cause severe burns.
  • the solid NaOH particles that often can be used to make caustic solutions by dissolution in water also present serious health concerns, and their use, shipment, and storage must be carefully controlled; they are subject to numerous safety regulations.
  • Lime can be considerably less expensive than NaOH and also may be preferable from a health-safety standpoint, but handling problems associated with lime typically overshadow its use.
  • These alkaline-neutralizing agents may contain lime particles, which can be suspended in lime slurries.
  • lime slurry usage can be in sewage and wastewater treatment, where alkaline-neutralizing agents may commonly be used to treat large amounts of water that have an acidic pH, or to increase the pH of the water to kill bacteria, microbes, and/or other organisms.
  • Lime slurries may sometimes be used as a substitute for caustic solutions to raise or neutralize the pH of commercial-scale acidic solutions such as treated wastewater. Unlike NaOH solution, these slurries may not be true solutions but instead can be suspensions of solid particles of hydrated lime in water.
  • particles of quicklime chemically, calcium oxide or CaO
  • the quicklime particles are hydrolyzed to produce particles of hydrated lime (Ca(OH) 2 ).
  • dry hydrated lime, Ca(OH 2 ) can be slurried with water to make a hydrate slurry.
  • Lime slurries may exhibit comparable reducing or alkaline-pH neutralizing power as alkali-metal hydroxide solution caustic agents while not requiring the addition of potentially hazardous alkali-metal hydroxides to the slurries.
  • a conventional lime-based caustic-replacement slurry may include a quantity alkali-metal hydroxide in the slurry.
  • very-high solids lime slurries may be used, for example about or exceeding 30% hydrated lime solids by weight. But using such high-content lime solids can be problematic because the resulting viscosity can render the slurries impractical or un-useful from a materials-handling standpoint.
  • One way to reduce the viscosity of a high solids lime slurry may be to add gypsum.
  • Another method to moderate the viscosity of a high-solids content hydrated lime suspension may be to incorporate a polymeric dispersing agent.
  • a polymeric dispersing agent For example, certain polyacrylic acids have been used as dispersing agents to moderate the viscosity of such a high-solids suspension.
  • Other methods of making an alkaline-neutralization agent with high solids have been outlined in several patent applications. Some examples of these high solids lime slurries have been outlined in U.S. Pat. No. 7,718,085 and U.S. Pat. No. 7,897,062.
  • creating lime slurries, especially a high solid version can lead to scale.
  • One issue with using lime slurries can be scaling with the equipment.
  • the increase in solids can result in very high viscosities and can also lead to increased scaling in the slurry-producing and conveying equipment as well as in other areas within the process.
  • This scaling can occur within the atomizers of a spray dry absorber (SDA).
  • SDA spray dry absorber
  • the scaling can lead to maintenance issues, feed rate decrease, density changes, and reduction of stability in the sulfur oxide (SO x ) levels in the SDA.
  • SO x sulfur oxide
  • Other inconsistencies not listed herein may also occur within the lime slurry process.
  • scaling may also increase lime usage.
  • the present invention may provide improved methods for reducing the scaling during the lime slurry process and generating a more highly reactive slurry that can reduce lime usage.
  • an object of the invention to provide a process of making an alkaline-neutralizing agent. It may include the step of forming a mixture comprising at least one polymeric dispersant and a quantity of water. It may also include the step of introducing the mixture to a vessel for preparation of a slurry.
  • the alkaline-neutralization agent may comprise a lime slurry.
  • the process of forming the mixture comprising at least one polymeric dispersant and a quantity of water occurs prior to the step of introducing the mixture to the vessel for preparation of a slurry.
  • the process forming the mixture comprising at least one polymeric dispersant and a quantity of water occurs simultaneously with the step of introducing the mixture to the vessel for preparation of a slurry.
  • the process of forming the mixture further comprises the step of adding the quantity of water to at least one polymeric dispersant.
  • the process of forming the mixture further comprises the step of adding at least one polymeric dispersant to the quantity of water.
  • At least one polymeric dispersant used within the process is a straight-chain polyacrylate homopolymer.
  • At least one polymeric dispersant used within the process is heat-stable.
  • the process of making a slurry is performed under a batch process.
  • the process of making a slurry is performed under a continuous flow process.
  • the process of making an alkaline-neutralizing agent reduces scaling.
  • the process of making an alkaline-neutralizing agent reduces alkaline chemical usage.
  • the process of making an alkaline-neutralizing agent reduces waste ash.
  • the process of making an alkaline-neutralizing agent reduces mercury gas emissions.
  • the process of making a lime slurry comprises the steps of forming a mixture comprising at least one polymeric dispersant and a quantity of water wherein at least one polymeric dispersant is a straight-chain polyacrylate homopolymer and wherein at least one polymeric dispersant is heat-stable; forming a mixture comprising at least one polymeric dispersant and a quantity of water wherein at least one polymeric dispersant is added to quantity of water; and introducing the mixture to a vessel for preparation of a slurry wherein the process reduces scaling, reduces alkaline chemical usage, and reduces waste ash, and reduces mercury gas emissions.
  • the process of making a lime slurry comprises the steps of forming a mixture comprising at least one polymeric dispersant and a quantity of water wherein at least one polymeric dispersant is a straight-chain polyacrylate homopolymer and wherein at least one polymeric dispersant is heat-stable; and forming a mixture comprising at least one polymeric dispersant and a quantity of water wherein at least one polymeric dispersant is added to the quantity of water.
  • Another object of the present invention can be to provide a process of making an alkaline-neutralizing agent that is easy to implement and use.
  • FIG. 1 is a flow diagram schematically illustrating the present invention.
  • a process for making an alkaline-neutralization agent is disclosed.
  • the process can be used in all applications using an alkaline-neutralization agent to prepare a slurry, including a lime slurry 50 .
  • the alkaline-neutralization agent may comprise at least one polymeric dispersant 10 and a solvent.
  • the solvent may be water 20 .
  • the slurry may also comprise an alkaline chemical like NaOH.
  • the alkaline chemical may be NaOH in various forms including but not limited to pellets, flakes, chips, granules, and solutions.
  • the slurry may contain slaked or hydrated lime, or a caustic replacement in softening applications and/or to neutralize acidic pH of wastewater and other aqueous liquids on a municipal, commercial, or industrial scale. It can also be used with high solids lime slurries, for example in those described in U.S. Pat. Nos. 7,718,085 and 7,897,062.
  • the method may use at least one polymeric dispersant 10 which does not suffer from the drawbacks of conventional polymeric dispersants: these heat-stable polymeric dispersants 10 can withstand elevated temperatures about or greater than 180° F. Often, these heat-stable polymeric dispersants 10 may withstand temperatures at about 200° F. or about 225° F. without becoming inactivated or ineffective. These polymeric dispersants 10 can also be stable under the elevated pHs associated with a lime slurry 50 .
  • At least one heat-stable polymeric dispersant 10 may be selected so that it can be effective in maintaining the hydrated lime particles in the slurry and limiting hydrolysis of the quicklime particles suspended.
  • the use of at least one heat-stable polymeric dispersant 10 may assist in sufficiently dispersing the hydrated lime particles in the water carrier phase so as to appropriately moderate the suspension viscosity as further described below for an extended period.
  • the use of at least one heat-stable polymeric dispersant 10 can withstand temperatures of about or in excess of 180° F., including those temperatures of about 200° F., about 220° F., or about 225° F. without losing the above-mentioned capability.
  • the heat-stable polymeric dispersant 10 may be a straight-chain polyacrylate homopolymer having a molecular weight in the range of about 1000 g/mol to about 10000 g/mol, which can be made using an organic initiator and an isopropyl alcohol chain-transfer agent.
  • the straight-chain structure of the heat-stable polymeric dispersant 10 like a polyacrylate homopolymer may contribute to a high degree of thermostability.
  • the organic initiator may replace the persulfate/bisulfite redox reagents typically used as acrylate initiators, and the isopropyl-alcohol chain-transfer agent may regulate chain-length and molecular weight within the desired range without introducing ferrous sulfate typically used to make low molecular-weight polyacrylates, and may consequently exclude or can be substantially devoid of iron from the finished straight-chain homopolymer.
  • One heat-stable polymeric dispersant 10 that may be used is available commercially from Coatex, LLC, Chester, S. Carolina under product designation TH450-50AS, which is a straight-chain polyacrylate homopolymer having a nominal molecular weight of about 4500 g/mol and which comprises about 50% acid solids.
  • the heat-stable polymeric dispersant 10 may be able to withstand a high pH environment without being destroyed or modified.
  • a high pH environment value may be about 9.5 to about 13.0.
  • Both the heat stability and high pH resistance of the polymeric dispersant 10 can allow it to maintain its physical properties in order for it to be effective within the lime slurry 50 and in reducing and/or stopping lime scaling using systems such as those of an SDA.
  • the polymeric dispersant 10 can maintain such properties as a small particle size, which in essence can increase the affected surface area of the polymeric particles and can provide a greater reaction potential for the polymeric dispersant-created lime slurry. This increased reaction potential may improve the performance of the lime slurry 50 within the SDA gas reaction zone and within clarifier mixing zones.
  • the polymeric dispersant 10 addition may be made to the water 20 either prior to or simultaneously with the addition of this mixture to the vessel 40 .
  • the polymeric dispersant 10 may be added to the water 20 , or the water 20 may be added to the polymeric dispersant 10 .
  • This vessel 40 may be a mixing vessel, a blending vessel, and/or a reaction vessel.
  • the vessel 40 may also be any style or design.
  • the vessel 40 may also be configured to provide a batch process or a continuous flow process.
  • the water 20 may serve as the continuous phase for the suspension, and can be the medium in which the remaining, undissolved components (e.g. hydrated lime) may be suspended in the finished lime slurry 50 .
  • the amount of the polymeric dispersant 10 used may be about 0.3% to about 1.5% by weight.
  • the amount of water 20 used may be about 35% to about 60% by weight.
  • the water 20 and the heat-stable polymeric dispersant 10 may then be mixed together, either prior to or simultaneously with, the addition to the vessel 40 .
  • the balance of the lime slurry 50 may be comprised of hydrated lime either with or without gypsum. Although the gypsum may be added, it is not shown in FIG. 1 .
  • the lime slurry 50 may then be prepared according to the following methodology, wherein hydrated lime is produced in situ through hydrolysis of quicklime.
  • the volume of total lime slurry 50 at the desired hydrated-lime solids content can first be determined based on application-specific parameters. Once these values are known, the appropriate amount of water 20 and polymeric dispersant 10 can then be charged to a mixing and/or blending vessel 40 equipped with agitators in which the lime slurry 50 can be prepared.
  • the present invention may also be utilized in any lime slaking production unit design. Therefore, any vessels capable of withstanding temperatures achieved when slaking (hydrating) quicklime may also be considered useful to prepare the process and method disclosed. These temperatures may be up to or above 225° F.
  • an appropriate amounts of polymeric dispersant 10 , water 20 , and lime 30 can be added into the vessel 40 where the lime slurry 50 can be prepared.
  • the heat-stable polymeric dispersant 10 and the water 20 may be added at the same time, for example by co-injecting them or by impinging the polymeric dispersant 10 into the stream of the water 20 when filling the vessel 40 , which may accelerate thorough and uniform mixing of the polymeric dispersant 10 into the water 20 .
  • a batch operation may be used to continue agitating the mixture for a period of time.
  • This period of time may be 10 minutes to ensure uniform mixing.
  • a static mixer may be used into which the polymeric dispersant 10 and water 20 may be added and mixed. Also, adding the polymeric dispersant 10 into a point within the piping for the water 20 may also be done.
  • gypsum is to be added to the slurry, it can be added just prior to adding the quicklime into the mixture.
  • the final desired hydrated-lime concentration in the lime slurry 50 can be determined in order to measure and deliver an appropriate amount of gypsum into the vessel 40 if gypsum were to be added.
  • the dosing may be done on the basis of the lime 30 feed to the slaker since this value can be measured and monitored.
  • the lime 30 for example quicklime
  • the powdered quicklime may be injected below the water surface within the vessel 40 to avoid the generation of dust, which can result not only in certain health concerns for the operator but also the loss of an unknowable amount of quicklime from the hydrolysis reaction to produce suspended slaked lime (also referred to as hydrated lime or Ca(OH) 2 ).
  • the rate of quicklime addition to the water can be regulated by the operator. For water volumes on the order of 15,000 gallons and quicklime quantities on the order of 50,000 pounds (which can produce a slurry of nominally about 39% to about 40% by weight of hydrated lime), the addition may last from about one to about two hours.
  • the lime 30 can begin to hydrolyze immediately on being introduced into the water 20 . Consequently, during the time when the lime 30 may be added, the temperature of the vessel 40 and its contents may rise, potentially exceeding about 200° F. or about 225° F. Depending on the amount of lime slurry 50 required and the concentration of hydrated lime to be used, the hydration reaction typically may be completed within two to three hours after lime 30 addition, at which time the vessel 40 contents will begin to cool. As the example(s) below will demonstrate, a lime slurry 50 made according to this process may possess Brookfield viscosities in the range of about 650 cps to about 1000 cps as measured at 70° F. and 5 RPMs, with spindle #2, despite solids loadings in the range of about 30% to about 46% by weight.
  • the lime slurry 50 once made, can be stored for extended periods of time if necessary. If stored for a long enough time that settling does occur, the solids can simply be stirred back up through mixing or agitation prior to use. The lime slurry 50 does not suffer from significant particle agglomeration as already discussed, so it can be possible to re-suspend the solids prior to subsequent use.
  • a benefit of using the heat-stable polymeric dispersant 10 is that it can withstand the high temperatures in the lime slurry 50 resulting from the hydrolysis of quicklime to hydrated lime.
  • the polymeric dispersant 10 can be added to the slurry mixture before the quicklime addition, and may remain functional to moderate viscosity for the finished high-solids lime slurry 50 (post-hydrolysis) to within an acceptable range from a materials-handling standpoint, for example from about 600 cps to about 2,000 cps at 70° F. 5 RPMs with spindle #2.
  • a lime slurry 50 having the compositions and made as described above may not result in substantial agglomeration and sedimentation of hydrated lime particles, despite the incorporation of gypsum.
  • the heat-stable polymeric dispersant 10 described above may inhibit the sort of particle agglomeration that typically has been known to result based on the addition of gypsum as a viscosity-control agent.
  • the ability of the heat-stable polymeric dispersant 10 to withstand the temperatures seen during lime hydration (slaking) may be improved by adding the polymeric dispersant 10 to the water 20 before slaking the lime.
  • Post-addition of the polymeric dispersant 10 to the vessel 40 after lime 30 , namely quicklime, has been slaked to produce the hydrated lime in suspension has been found to lower slurry viscosity from baseline for a lime slurry 50 of about 40% solids by weight without any dispersant at all, with the resulting slurry viscosity still too high. This viscosity may be about 10,000 cps at 70° F.
  • the order of adding the polymeric dispersant 10 may be important.
  • the polymeric dispersant 10 is added to the water 20 prior to the introduction of lime 30 , namely quicklime, to produce hydrated lime in situ, the scaling can be reduced.
  • SDA spray dry absorbers
  • the mixing and/or blending vessel 40 where the lime slurry 50 may be prepared can exhibit a substantial reduction in scale buildup.
  • One of the most notable benefits of this process may be the controlled scaling and depositing of the atomizers and SDAs.
  • the lime slurry 50 density decreases and the feed rate of the lime slurry 50 can also be decreased.
  • Pipes and pumping systems for transporting the lime slurry 50 may be substantially deposit-free and may not suffer from plugging as with conventional hydrated-lime slurries.
  • a hydrated-lime slurry as disclosed herein can be more reactive from a pH-neutralization standpoint than conventional lime slurries, which may be due to the polymeric dispersant 10 disclosed herein being more effective to sustain small particles in suspension (preventing sedimentation and the deposition of sludge), as well as to permit a high-solids content of relatively small-sized hydrated lime particles (having greater available surface area) while maintaining an acceptable viscosity for material-handling purposes.
  • This reduction in scale may lead to reduced overall systems maintenance and decreased operating costs associated with lime usage and maintenance issues.
  • the improved process can allow for a decreased lime 30 usage.
  • This reduction in excess lime may result in a lime 30 use reduction from about 25% to about 37%.
  • This reduction in excess lime 30 with its attending water 20 may lower the load during the process and can allow for a generation of a more stable feed rate since the lime slurry 50 created can appear to be more uniform.
  • This improved stability of the system may also lead to more consistent products. For example, sulfur oxide (SO x ) levels can be more stable with the process.
  • waste ash there can be a decrease of waste ash within the process described herein. This decrease of waste ash may range from about 25% to about 38%. This can result in a more favorable and environmentally positive process.
  • the process as described herein may result in a decrease in mercury content for the ash products. Not only can this process control mercury gas emissions, but it may also result in another more favorable, environmentally positive process. This decrease in mercury may also improve the mercury removal in the stack gases.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
US13/355,872 2012-01-23 2012-01-23 Process for lime slurry production Abandoned US20130187087A1 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
US13/355,872 US20130187087A1 (en) 2012-01-23 2012-01-23 Process for lime slurry production
BR112014018052-0A BR112014018052B1 (pt) 2012-01-23 2012-09-12 processo para a fabricação de uma pasta fluida de cal
EP12769531.0A EP2807127A1 (en) 2012-01-23 2012-09-12 A process for lime slurry production
PCT/US2012/054803 WO2013112204A1 (en) 2012-01-23 2012-09-12 A process for lime slurry production
AU2012367236A AU2012367236B2 (en) 2012-01-23 2012-09-12 A process for lime slurry production
CA2861443A CA2861443C (en) 2012-01-23 2012-09-12 A process for lime slurry production
JP2014553285A JP2015509901A (ja) 2012-01-23 2012-09-12 石灰スラリーを製造するためのプロセス
MX2014008868A MX356941B (es) 2012-01-23 2012-09-12 Un proceso para la produccion de lechada de cal.
CN201280067900.7A CN104185614A (zh) 2012-01-23 2012-09-12 石灰浆料的制备方法
ZA2014/05014A ZA201405014B (en) 2012-01-23 2014-07-09 A process for lime slurry production
IN5793DEN2014 IN2014DN05793A (ja) 2012-01-23 2014-07-11
CO14158668A CO7111309A2 (es) 2012-01-23 2014-07-22 Un proceso para la producción de lechada de cal
US14/812,205 US9309151B2 (en) 2012-01-23 2015-07-29 Process for lime slurry production

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US13/355,872 US20130187087A1 (en) 2012-01-23 2012-01-23 Process for lime slurry production

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US14/812,205 Active US9309151B2 (en) 2012-01-23 2015-07-29 Process for lime slurry production

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US (2) US20130187087A1 (ja)
EP (1) EP2807127A1 (ja)
JP (1) JP2015509901A (ja)
CN (1) CN104185614A (ja)
AU (1) AU2012367236B2 (ja)
BR (1) BR112014018052B1 (ja)
CA (1) CA2861443C (ja)
CO (1) CO7111309A2 (ja)
IN (1) IN2014DN05793A (ja)
MX (1) MX356941B (ja)
WO (1) WO2013112204A1 (ja)
ZA (1) ZA201405014B (ja)

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US11027995B2 (en) * 2017-11-08 2021-06-08 Graymont Western Canada Inc Treatment of tailings streams with one or more dosages of lime, and associated systems and methods

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Publication number Priority date Publication date Assignee Title
US9309151B2 (en) * 2012-01-23 2016-04-12 Applied Specialties, Inc. Process for lime slurry production
CN104909470A (zh) * 2015-06-10 2015-09-16 绍兴市制水有限公司 稀释水的预处理装置及处理方法
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US11613485B2 (en) 2017-08-18 2023-03-28 Graymont Western Canada Inc. Treatment of tailings with lime at elevated PH levels
US11027995B2 (en) * 2017-11-08 2021-06-08 Graymont Western Canada Inc Treatment of tailings streams with one or more dosages of lime, and associated systems and methods
US11618697B2 (en) 2017-11-08 2023-04-04 Graymont Western Canada Inc. Treatment of tailings streams with one or more dosages of lime, and associated systems and methods
US10894730B2 (en) 2018-09-11 2021-01-19 Graymont (Pa) Inc. Geotechnical characteristics of tailings via lime addition
US11718543B2 (en) 2018-09-11 2023-08-08 Graymont Western Canada Inc. Geotechnical characteristics of tailings via lime addition
US11724946B2 (en) 2018-09-11 2023-08-15 Graymont Western Canada Inc. Geotechnical characteristics of tailings via lime addition

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BR112014018052A2 (ja) 2017-06-20
IN2014DN05793A (ja) 2015-05-15
CA2861443A1 (en) 2013-08-01
AU2012367236A1 (en) 2014-08-28
JP2015509901A (ja) 2015-04-02
US9309151B2 (en) 2016-04-12
CN104185614A (zh) 2014-12-03
US20150329421A1 (en) 2015-11-19
MX356941B (es) 2018-06-20
CO7111309A2 (es) 2014-11-10
CA2861443C (en) 2018-06-05
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WO2013112204A1 (en) 2013-08-01
EP2807127A1 (en) 2014-12-03

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