Parts & Components
Slaker Types
In lime slaking, no two lime and water combinations are ever the same. Factors like water temperature, water chemistry, particle size, slaking temperature, slaking agitation and residence time all impact the lime slaking process and the quality of the final hydrated lime slurry.
At Carmeuse Systems, we understand the importance of producing a reactive lime slurry. Selecting the right equipment for your lime slaking process is key to achieving this. Our teams are dedicated to helping you choose the best lime slaking systems for your operation, taking your requirements for lime quality, system capacity, ease of operation, available footprint and overall cost-effectiveness into account.
Choosing the Right Slaker
The first step toward highly effective slaked lime is selecting the right type of lime slaker based on your specific parameters. We design and provide a variety of slaker types, but first, we collaborate with you to determine the best option for your process and budget. Carmeuse Systems takes the time to understand your application, process and site-specific needs, ensuring you get the right type of lime slaker optimized for your operation.
Lime Manufacturing and the Lime Slaking Process
Quicklime, often referred to as either calcium oxide (CaO) or lime, is manufactured by heating the raw material ‘limestone’ or ‘calcium carbonate’ in large kilns. This process removes CO2 that is trapped in the stone leaving behind CaO and other minor mineral constituents. This CaO molecule is what we consider to be high calcium quicklime.
Quicklime as CaO is not the most useful chemical form for many applications. For applications such as water treatment, flue gas treatment, and when used as a raw ingredient in some chemical applications, the quicklime must first be slaked. Slaking occurs when quicklime is reacted with water to form Ca(OH)2, most commonly called hydrated lime in its dry form or lime slurry or milk of lime in its wet form. The slaking process is exothermic, releasing heat as the quicklime and water mix and chemically combine. A lime slaking system that is not running at its peak could be unsafe, cost you money and potentially shut your process down.
Equipment Used for the Slaking Process
The quality of your slaked lime can have a major impact on your chemical consumption, material cost, and the operating cost of your system. The first step toward avoiding ineffectively slaked lime is selecting the right type of lime slaking equipment based on your parameters, such as pebble size and water temperature. We collaborate with you to determine the best option for your process and budget, offering detention, batch type / mix tanks, vertical ball mill, and portable lime slakers.
BatchSlaker
Capabilities
Batch Slakers / Mix Tanks
Some processes are more simplistic and do not require a high-quality lime slurry. Batch slakers, also commonly referred to as mix tanks, produce a carefully metered slurry and are best suited to applications in which slurry production rate is relatively low and where there are few (if any) changes to the quicklime quality and water sources.
Carmeuse Systems can customize batch type slakers / mix tanks with various options to meet your needs. Let Carmeuse Systems review your requirements to determine the best fit for your application.
DetentionSlaker
Detention Slakers
Detention slakers are relatively inexpensive to install and are well suited to applications where lime quality is reliable. The ZMI Portec Detention Slaker from Carmeuse Systems slakes quicklime (particle size up to ¾”) and produces slurry with up to 25% solids. This solids concentration allows any lime added to the slaker to be quickly mixed eliminating hot spots from forming. Our detention slaker produces a highly reactive lime slurry to meet your application needs and maximizes your lime usage.
Research has shown that for any given quicklime source, slaking temperature control is the single most important factor influencing the reactivity of the final lime slurry. Our fully automated temperature control provides a highly reactive slurry and minimizes hot spots.
BallMillSlaker
Vertical Ball Mill Slakers
When lime or water quality is poor and/or when lime consumption rates are high, Carmeuse Systems designs slaking systems utilizing a vertical ball mill. The total grinding process of a vertical ball mill utilizes all residual reaction value, virtually eliminates grit disposal problems, and significantly improves lime usage efficiency. Carmeuse Systems has partnered with Metso to integrate the VERTIMILL® into Carmeuse Systems' complete system package. This, along with our patented lime feed arrangement specifically designed for the Metso VERTIMILL® Slaker, ensures all lime fed to the mill reacts completely with water to produce a highly reactive slurry.
When your environment is demanding or requires grit to be ground and retained in the lime slurry, rather than being screened, collected, and disposed of, Carmeuse Systems has the experience to overcome your obstacles and design the right product to achieve your operational goals.
PortableSlaker
Portable Lime Slakers
The portable lime slaker from Carmeuse Systems is a self-contained lime detention slaking system that is equipped with all the necessary components needed in a turnkey solution. This lime slaking unit is a plug-and-play slaking plant, no building systems, and with its trailer capability, you can transfer it easily making it both a cost-effective and convenient way to use lime slurry no matter the job and/or location.
Upgrade Your Existing Lime Slaker with New Technologies
Retrofitting your older lime slaker with new technologies can help to make your slaker safer and more efficient at a fraction of the cost of a complete system replacement. Carmeuse Systems continually makes improvements to existing components and offers new features that make equipment, like our lime slakers safer, more reliable, and more productive. If you have an existing lime slaker from Carmeuse Systems like our ZMI Portec Detention Slaker and METSO® VERTIMILL® Slaker, you can take advantage of these new offerings by contacting us to learn about the retrofits and upgrades available for your specific lime slaker.
End-2-End Support
When it comes to slaking quicklime, Carmeuse Systems is your go-to solution provider from End-2-End. As part of Carmeuse, we understand the systems necessary to handle lime slurry effectively but also the intricacies of the raw material itself. Carmeuse is a leading provider of lime and limestone products and through our End-2-End Services, we support customers from the mines where the raw material is produced through to the point of application.
The benefits of working with Carmeuse Systems includes:.
- Expertise in Lime and Limestone
- Engineering and Design Expertise for Complete Lime Handling Systems
- Component Parts to Integrate into Existing Applications
- System Retrofits and Upgrades
- Maintenance and Replacement Parts at the Ready
- Access to Experts to Diagnose System Issues and Improve Efficiencies
- Laboratory Services through our Innovation Center
Learn more about our End-2-End Services.
Related Content
FAQs
Slaking is the term used for the chemical reaction that occurs when quicklime (CaO) is mixed with water. This reaction is commonly performed with an excess of water, and this creates a slurry of solid calcium hydroxide particles floating in water and this is commonly called ‘Lime Slurry’ or ‘Milk of Lime’. This exothermic reaction releases heat and special reaction vessels called ‘Lime Slakers’ are important to control this process in a safe and efficient manner.
Slaked lime has a wide variety of uses including water treatment for municipal drinking water and wastewater, industrial wastewater, acid mine drainage treatment, and flue gas treatment and as a raw ingredient to produce various chemicals and is key in the Kraft paper production process among countless other uses. Slaked lime owes its versatility to its capability to adjust pH and neutralize acids in a relatively safe and cost-effective manner compared to competing chemicals and technologies.
While quicklime is a very economically advantageous form of calcium reagents in terms of potency and shipping, CaO is not immediately useful in a wide range of applications. The most chemically useful form of calcium reagents for pH adjustment is calcium hydroxide (Ca(OH)2) due to this form being immediately chemically available for neutralization of acids in water or waste flue gases. Lime slurry is a chemical base that is already in preparation of fine particles of suspended solids in water that can participate in chemical reactions in the most efficient manner.