Hydrated lime made from pure calcium oxide will be roughly 74 percent calcium oxide and 24 percent chemically combined water.
Dolomitic hydrated lime will have about 48 percent calcium oxide, 34 percent magnesium oxide and 17 percent water. Hydrated lime is white and powdery. Quicklime is mainly used in industry as a catalytic agent.
It is used in steelmaking to help separate impurities from the molten steel. It also helps separate sulfur from industrial smoke emissions. Quicklime also is used to make paper, refine metals and make fiberglass. And its affinity for water makes it a useful drying agent in various industrial processes. The best example is flue gas treatment , also known as Flue Gas Desulphurization , used in coal fire plants, cement industries, glass industries, and incinerators to reduce their HCl, Sox and Nox emissions.
Some of these systems require hydrated lime to filter or catalyze the particles emitted after combustion, while other systems use quicklime. The principles are exactly the same, and the feed rates will be quite similar. However, the process and chemistry of the flue gas dictates when to use quicklime or hydrated lime.
If the system requires a lime slurry, the main way to determine if hydrated lime would be more suitable than quicklime is to know the amount that a given process requires. In systems that demand large quantities of lime, quicklime would be the preferred material as the density is twice the density of hydrated lime, which reduces the storage and transportation costs. The slaking of the pebble lime and powdered quick lime has to be engineered in respect to their exothermic reactions. The lime slaker mixes quicklime with water to create calcium hydroxide in a solution which is called lime slurry.
Slakers are good for a high volume consumption, or high demand, of calcium. However, when a smaller or medium lime solution is requested, hydrated lime is more efficient because the equipment required to use the hydrated lime is simpler and does not need to be designed to handle an exothermic reaction. The volume of lime you need will determine what container capacity is necessary. Therefore, like limestone, these compounds are also alkaline.
Overview and Key Difference 2. What is Quicklime 3. What is Hydrated Lime 4. Quicklime is calcium oxide. We produce it by the thermal decomposition of limestone. Limestone contains calcium carbonate. It liberates carbon dioxide forming quicklime. This substance is relatively inexpensive. The chemical formula of the compound is CaO. The result will be a lime slurry ready to be injected into the process. On the contrary, when the demand of lime consumption is low or medium, Hydrated lime is used.
What equipment is mainly used with hydrated lime? SODIMATE scope of supply starts with the storage device that can be silo, big bag emptying station or hopper, a mechanical bin activator, an air injection systems or simple vibrators pads. The lime can be fed and conveyed by different means, including rotary air locks, screw feeders, conveyor belts, drag chain conveyors or pneumatic conveyors.
If the lime needs to be converted into a lime slurry , a lime slurry tank can be requested and equipped with an agitator and a water supply control valve. To transport the lime slurry solution we use pumps. We generally recommend peristaltic pumps. The pumps needed with quicklime are the same as those used with hydrated lime, which includes an injector, sludge mixer, and mechanical bin activator. However if the lime is injected into a solution, we will also need a lime slaker.
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