What is a Calcium hydroxide production plant

The Calcium hydroxide production plant is an industrial grade complete set of equipment that integrates raw material processing,chemical reactions,product separation,and drying.Its core function is to convert natural limestone into high-purity calcium hydroxide powder or slurry through processes such as calcination,digestion,and classification.As a core raw material in the fields of environmental protection,building materials,chemical engineering,etc.,the technical level of Calcium hydroxide production plant directly affects product quality and industrial application breadth.
1、Device composition
The Calcium hydroxide production plant consists of six core systems,forming a closed-loop control from raw materials to finished products:
Raw material pretreatment system

The calcium hydroxide production plant includes a jaw crusher,vibrating screen,and silo,which crushes limestone to a particle size of 20-50mm and removes impurities through multi-stage screening.For example,a certain enterprise uses a double-layer vibrating screen to increase the purity of raw materials to over 98%,providing excellent raw materials for subsequent calcination.

Calciner System
Using rotary kilns or vertical kilns,calcium carbonate is decomposed into calcium oxide(CaO)and carbon dioxide(CO₂)at high temperatures of 900-1100℃.The key control point lies in temperature uniformity-a new type of rotary kiln uses zone temperature control technology to control the temperature difference inside the kiln within±5℃,ensuring that the activity of calcium oxide reaches over 300ml.
digestive system
Composed of a pre digestion machine and a secondary digestion machine,the conversion of calcium oxide to calcium hydroxide is achieved by controlling the water calcium ratio and stirring intensity.For example,a certain enterprise uses a dual axis stirring digestion machine to shorten the digestion reaction time to 15 minutes,while raising the initial temperature to 80℃through a hot water circulation system,significantly improving the reaction efficiency.
Hierarchical screening system
Using a turbine classifier or air separator,particle size classification is achieved through the synergistic effect of airflow and rotor.Taking a classifier as an example,its guide vanes are designed to evenly distribute the airflow velocity,and the rotor speed can be adjusted within a range of 500-3000rpm.It can separate calcium hydroxide products ranging from 325 mesh to 2000 mesh,meeting the needs of different industries.
dry system
It includes a drum dryer and a spray drying tower to reduce the water content of calcium hydroxide slurry from 60%to less than 1%.A certain enterprise adopts a heat transfer oil heated drum dryer,combined with countercurrent drying technology,to increase the thermal efficiency to 85%,and the daily processing capacity of a single equipment reaches 50 tons.
Environmental Control System

Integrate pulse bag filter and water film dust removal tower to achieve standard emissions of dust and exhaust gas.For example,a certain production line controls the dust concentration below 10mg/m³through a negative pressure dust removal system,which is far below the national emission standards.

2、Technological evolution
The technological development of Calcium hydroxide production plant has undergone three major breakthroughs:
Automation Control Stage(2010-2015)
Introduce PLC control system to achieve automatic adjustment of parameters such as raw material ratio,calcination temperature,digestion time,etc.A certain enterprise has improved production efficiency by 30%and maintained a product qualification rate of over 99.2%through DCS distributed control system.
Energy conservation and environmental protection stage(2016-2020)
Developing waste heat recovery and low nitrogen combustion technology for Calcium hydroxide production plant to reduce energy consumption and pollutant emissions.For example,a new type of calcination kiln uses a flue gas waste heat boiler to convert waste heat into steam for the digestion system,reducing comprehensive energy consumption by 25%;At the same time,through SNCR denitrification technology,the concentration of nitrogen oxide emissions is reduced to below 50mg/m³.
Intelligent stage(2021 present)
Integrating IoT and big data technology to achieve remote monitoring and intelligent optimization of production processes.The digital twin platform built by a certain enterprise can simulate the operation status of the production line in real time,predict equipment failures through AI algorithms,reduce unplanned downtime by 60%,and reduce maintenance costs by 40%.
3、Application scenarios
The products of Calcium hydroxide production plant are widely used in four core areas:
environment protection
As a flue gas desulfurizer,Calcium hydroxide production plant can effectively absorb sulfur dioxide(SO₂)with a desulfurization efficiency of over 95%.A certain power group adopts the calcium hydroxide wet desulfurization process to reduce the sulfur dioxide emission concentration of coal-fired power plants to 35mg/m³,meeting the ultra-low emission requirements.
water treatment
Calcium hydroxide,as a pH regulator,can neutralize acidic wastewater to neutrality while removing heavy metal ions.For example,in the treatment of electroplating wastewater,by controlling the amount of calcium hydroxide added,the pH of the wastewater is stabilized at 7-8,and the removal rate of heavy metal ions reaches over 99%.
building materials
Calcium hydroxide is the core raw material for preparing gypsum board and putty powder.A certain building materials enterprise adopts calcium hydroxide based putty powder,which improves the water resistance of the product by 50%and the construction efficiency by 30%.Its market share has been among the top in the industry for three consecutive years.
agricultural improvement
Calcium hydroxide can regulate soil pH and promote crop growth.In the acidic soil improvement project,the application of calcium hydroxide increased the soil pH from 4.5 to 6.5,increased rice yield by 20%,and reduced the incidence of pests and diseases by 15%.
The technological evolution of Calcium hydroxide production plant from traditional lime kilns to intelligent production lines reflects the upgrading path of China's industry.Driven by both environmental policies and market demand,this device is providing critical support for global sustainable development with higher efficiency,lower energy consumption,and wider applications.