How is slaked lime

Lime,as an important inorganic chemical raw material,has a wide range of applications in various fields such as construction,environmental protection,chemical industry,agriculture,etc.It can be manufactured by chemical reaction between quicklime and water.The manufacturing process of quicklime will be described in detail below.

The main raw materials for producing slaked lime are quicklime and water.Lime is usually produced by high-temperature calcination of limestone.In a lime kiln,limestone decomposes at high temperatures of 900-1300℃.The calcined quicklime has different block sizes and contains a certain amount of impurities,such as magnesium oxide,silicon dioxide,etc.In order to ensure the quality of quicklime,it is necessary to choose quicklime with good quality and high activity.Generally,it is required that the calcium oxide content be above 70%and the activity be high.This will result in a faster reaction rate during digestion and better reaction with water to produce quicklime.

Water is another important raw material for producing slaked lime,and its quality also affects the quality of slaked lime.It is generally required to use clean and uncontaminated water to avoid excessive impurities and harmful substances such as acidic substances,heavy metal ions,etc.These impurities may react with quicklime,affecting its purity and performance.Using soft water or treated reclaimed water,the temperature of the water can be adjusted according to the actual situation.Generally,room temperature is sufficient,but in winter,it can be heated appropriately to accelerate the reaction rate.
The production of slaked lime requires a series of specialized equipment,mainly including digesters,feeding devices,mixing devices,dust removal devices,and conveying devices.The digester is the core equipment for producing slaked lime,providing a suitable environment for the reaction between quicklime and water.Digestions usually adopt a multi-layer structure with internal stirring devices,which can fully mix quicklime and water and promote the digestion reaction.Common digesters have single axis,double axis,or multi axis mixing forms,and their materials are generally made of wear-resistant and corrosion-resistant alloy steel or stainless steel to adapt to the high temperature and strong alkaline environment generated during the lime digestion process.

The feeding device includes a quicklime feeder and a water feeding system.The quicklime feeder is responsible for delivering quicklime evenly and stably to the digester,and common types include screw feeders,vibrating feeders,etc.The water feeding system controls the amount of water added through metering pumps or flow meters to ensure that the ratio of quicklime to water meets the process requirements.

The stirring device is installed inside the digester,and its function is to thoroughly mix quicklime and water,accelerating the reaction rate.The speed and stirring method of the stirring device will affect the mixing effect and reaction speed,and usually need to be adjusted appropriately according to the particle size and activity of the quicklime.Generally speaking,when the stirring speed is fast,the mixing is more uniform and the reaction speed is also faster.However,excessively high stirring speed may increase equipment wear and energy consumption.
The manufacturing of slaked lime is a complex process involving multiple stages such as raw material preparation,equipment selection,process control,and quality control.By selecting raw materials reasonably,optimizing production processes,and strictly controlling quality,high-quality slaked lime products can be manufactured to meet the needs of different fields.