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What is Lime Slaking?
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Date : 11/6/2008
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Lime slaking is a chemical process developed to slake quicklime to hydrated lime slurry. It requires good equipment, and trained operators to do it safely and economically. The slaking process is more than just mixing lime and water. It must be controlled precisely to make the most reactive hydrated lime with the smallest particle size to provide the maximum reactance for the least amount of money.
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What is a Slaking System?
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Date : 11/6/2008
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A Slaking System is an assembly of equipment required to take quicklime from the point of delivery, through the storage bin, feeder, and slaker delivering the best possible reactive hydrated lime slurry to the point(s) of application.
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What is a Hi-Rise System?
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Date : 11/6/2008
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Coffman Industries coined the word to identify a system which would be manufactured and assembed in the factory, and truck shipped to the site. There are at least 25 basic arrangements in varying sizes and configurations, all custom-built to meet your specific requirements.
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What is a Uniflo Lime System?
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Date : 11/6/2008
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This refers to any special arrangement in which all components are designed and coordinated by the slaking system’s manufacturer, but installed, wired and piped by a general contractor due to considerable site limitations.
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How do I know what type of system I need?
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Date : 11/6/2008
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Some general questions and considerations needed to determine the best type of system and correct arrangement are listed below. A Coffman representative will be happy to go through the detailed questionnaire with you to gather the information needed to offer the least expensive, most efficient arrangement for the job. It’s important to have drawings or details about any existing equipment or facilities that must be included in the new system.
Basic questions and considerations include:
- Describe the basic process requiring lime treatment.
- Can the slurry be delivered to the point of application by gravity?
- How many points of application are there?
- How far, and how much lift to the point(s) of application?
- Will feed rate be more or less constant, or must it be paced from the plant flow meter, or PH controller?
- Is remote control and unattended operation required?
- How does the purchaser intend to deliver the lime slurry to the point of application, or is the system supplier to accept that responsibility?
- Will the system require specifications for Pebble Quicklime, Hydrated Lime or Potassium Permanganate?
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What should I look for in a slaking system?
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Date : 11/6/2008
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all of the parameters for efficient slaking—water ratio, temperature, consistency, mixing, detention time, and dilution.The slaking process must:
1) Control the proper water to quicklime ratio
2) Maintain & control reaction of proper temperature
3) Maintain proper slurry consistency, thick but flowable
4) Provide adequate detention/retention time
5) Provide mixing action that will mix the quicklime and water by multiple mixing cycle during detention
6) Stop the reaction at the slaker discharge to prevent needless crystal growth
7) Stabilize the slurry after slaking to reduce scaling down stream
8) Remove grit and other insoluble impurities if they cannot be tolerated by the process
9) Control the feed rate to desired rate
10) Deliver hydrated lime slurry to process.
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What is a truck unloading system?
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Date : 11/6/2008
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A truck unloading system consists of a 4” schedule 40 steel conveying pipe, with necessary couplings and accessories to convey material from the truck quick disconnect host fitting to the top of the storage bin
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What is a Bin Vent Filter?
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Date : 11/6/2008
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A bin vent filter is mounted on top of the Hi-Rise silo to exhaust the air used to convey the dry material from the truck to the top of the silo.
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What is a Bin Activator?
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Date : 11/6/2008
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A bin activator is provided on the silo cone and activates the material in the silo so it will always flow to the feeder.
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What is a Bin Gate?
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Date : 11/6/2008
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A bin gate is mounted on the bottom of the bin activator. Closing this gate stops the flow of material to the feeder allowing the feeder to be operated or serviced without material flowing from the silo.
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What is a Sampling Chute?
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Date : 11/6/2008
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Since the rotary feeder handles material of various sizes, it’s sometimes necessary to calibrate the feeder by taking weighted samples to determine the exact displacement of the material. This chute is quickly removable and allows easy access to the inlet of the slaker in the event of misoperation, water failure causing stop-up, or caking in the chute.
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What is a Vapor Remover?
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Date : 11/6/2008
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A vapor remover condenses the water vapors created by the slaking reaction. If not removed, the steam or water vapor will back-up into the feeding device.
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What is a Grit Remover?
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Date : 11/6/2008
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A grit remover is a separate piece of equipment and can be installed anywhere downstream of the reactor to separate grit (rocks) and sand from the calcium hydrate.
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What is a Slaker Water Control Panel?
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Date : 11/6/2008
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A stand alone slaker water control panel regulates all the water supplied to the slaker and grit remover with the use of flow controls.
Need more information, or have questions that aren’t covered here? Call us at 813-891-1300 and we’ll be glad to help.
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