What are the production equipment for Calcium hydroxide production line

Calcium hydroxide,commonly known as hydrated lime or hydrated lime,is an important inorganic alkali compound widely used in fields such as environmental protection,chemical engineering,construction,medicine,food,and agriculture.The transformation from hard limestone to powdered Calcium hydroxide production line cannot be achieved without a sophisticated and effective industrial production equipment.A complete set of Calcium hydroxide production line system is mainly built around the two core process links of"calcination"and"digestion",usually including the following key systems:

1、Raw material pretreatment system

1.Core equipment:Jaw crusher,hammer crusher,belt conveyor,vibrating screen,raw material warehouse
2.Crushing equipment:The mined limestone has a larger particle size and needs to be crushed first.Jaw crusher is used for primary coarse crushing,crushing large limestone blocks to medium particle size;Subsequently,the hammer crusher or impact crusher is used for medium and fine crushing,crushing the material to a particle size suitable for calcination.

3.Screening and conveying equipment:The crushed limestone is screened through a vibrating screen,and the qualified particles enter the next stage.The oversized particles are returned to the crusher for further crushing.Belt conveyors are responsible for transporting materials between various equipment.The processed limestone is sent to the raw material warehouse for temporary storage,preparing for continuous feeding.

2、Limestone calcination system

1.Core equipment:Lime kiln
This is the'heart'of the entire process,determining the quality and energy consumption of quicklime.The modern mainstream kiln types include:
2.Mixed firing vertical kiln:simple structure,low investment,suitable for small and medium-sized production.Limestone and fuel are mixed and calcined in the kiln.But its energy consumption is relatively high,and the uniformity of product quality is slightly poor.
Parallel flow thermal storage vertical kiln:an advanced dual chamber or multi chamber vertical kiln that uses parallel flow calcination and thermal storage technology to effectively recover heat from exhaust gas for preheating combustion air and limestone.It has high thermal efficiency,stable and uniform product quality,and is currently the mainstream choice for large-scale effective production.
3.Rotary kiln:a slowly rotating long cylindrical equipment suitable for large-scale continuous production,with stronger adaptability to raw material particle size.Its calcination is uniform and the product quality is good,but the equipment is large,the investment is high,and the footprint is large.

The calcined product is quicklime,which needs to be cooled and sent to the quicklime silo.

3、Lime digestion system

1.Core equipment:Digestive machine
This is the core process of converting quicklime into Calcium hydroxide production line.Lime undergoes a violent exothermic reaction with water:CaO+H₂O→Ca(OH)₂.
2.Traditional digestion tanks:intermittent operation,high labor intensity,low production efficiency,unstable product quality,have gradually been phased out.
3.Tank type digestion machine:Lime and water are continuously added to a tank with a stirring blade in a certain proportion,and fully react under stirring.The structure is relatively simple and widely used.
4.Horizontal rotary digestion machine:a more advanced continuous digestion equipment.The cylinder rotates slowly and is equipped with a lifting plate inside,allowing the material to be continuously lifted and scattered inside the cylinder,fully contacting with steam and water.This"mechanical+dynamic"digestion method has a fast reaction and produces calcium hydroxide with good fineness and high activity.
5.Combination type effective digestion machine:It integrates pre digestion,main shaft digestion,and aging into one,with high automation,and can control the water cement ratio and reaction temperature.It is an ideal equipment for producing high activity and high purity calcium hydroxide.

The heat generated during digestion causes water to evaporate,producing a large amount of water vapor.

4、Product refinement and grading system

1.Core equipment:Cyclone blower,vibrating screen,Raymond mill,airflow classifier
The hydrated lime coming out of the digestion machine may contain incompletely digested"burnt"lime cores or impurities,which need to be separated and refined.
2.Preliminary separation and impurity removal:The digested material first enters the cyclone blower,which uses centrifugal force to separate qualified fine powder from coarser particles.Coarse particles are removed through a vibrating screen.
3.Grinding and ultrafine grading:For customers with higher fineness requirements,qualified calcium hydroxide semi-finished products will enter the Raymond mill for deep grinding.Subsequently,through an air classifier,ultrafine hydrogenated calcium oxide powders with 800 mesh,1250 mesh,or even finer can be produced to meet the special needs of plastics,coatings,environmental protection,and other fields.

5、Finished product storage and packaging system

1.Core equipment:screw conveyor,bucket elevator,finished product warehouse,packaging machine
2.Transportation and storage:The refined calcium hydroxide powder is transported to a huge finished product warehouse for storage through equipment such as screw conveyors and bucket elevators.The finished product warehouse needs to be kept dry to prevent products from absorbing moisture and clumping.
3.Packaging:According to sales demand,quantitative packaging is carried out through fully automatic valve bag packaging machine or ton bag packaging machine for factory preparation.

6、Environmental Protection and Auxiliary Systems

1.Core equipment:dust collector,exhaust gas treatment device
2.Dust removal system:During the entire production process,especially in the crushing,screening,digestion,and packaging stages,a large amount of dust will be generated.Pulse bag filter is an essential environmental protection equipment,which can effectively collect dust,ensure workshop cleanliness and meet emission standards.At the same time,the recovered dust is also a product,reducing waste.
3.Waste gas treatment:Lime kiln calcination produces waste gas containing carbon dioxide and particulate matter,which needs to be treated with desulfurization,denitrification,etc.before being discharged.
The Calcium hydroxide production line equipment is a complex system that integrates mechanical,chemical,automatic control,and environmental protection technologies.Every step from"crushing calcination digestion refining packaging"is accompanied by corresponding professional equipment.Choosing a reasonable,effective,and reliable equipment combination can not only ensure the quality and activity of the product,but also achieve the goals of energy conservation,consumption reduction,and clean production,thus gaining an advantage in the fierce market competition.Therefore,a deep understanding of calcium hydroxide production equipment is of crucial importance for investors,production managers,and technical engineers.