Calcium Hydroxide Air Classifier

Calcium Hydroxide Classifier Introduction

The calcium hydroxide classifier is an efficient classification equipment specially developed for the characteristics of calcium hydroxide. It adopts advanced pre-classification technology (no grinding required, directly classify digested calcium hydroxide) and full-system anti-sticking design, which successfully solves the problems of adhesion, blockage and low classification efficiency of traditional classifiers when processing calcium hydroxide. Featuring compact layout, its floor area is reduced by more than 50% compared with traditional classifiers. Equipped with special anti-sticking rotor and optimized air passage, it realizes precise classification within 200~600 mesh. Its production capacity is nearly twice that of traditional classifiers, with 500 mesh sieve rate ≥95%. It is especially suitable for high-end application scenarios such as putty powder and grey calcium powder with strict requirements on product purity, serving as the core equipment for fine processing of calcium hydroxide.

Advantages of Calcium Hydroxide Classifier

Structural Features

Classification System: Special anti-sticking rotor paired with specially surface-treated blades and high-pressure fan effectively prevents calcium hydroxide adhesion to ensure smooth operation.

Dispersing System: Built-in high-efficiency material spreading device with unique anti-sticking spreading disc fully disperses calcium hydroxide materials.

Collection System: Single cyclone collector design with low investment and simple maintenance. The internal space is unobstructed, delivering excellent anti-sticking and anti-clogging performance.

Air Circuit System: Internal streamlined volute structure reduces airflow resistance. The inner wall adopts special smooth treatment to avoid blockage by calcium hydroxide materials.

Traditional Classifier (Left) and Calcium Hydroxide Classifier (Right)

Performance Advantages

Wear-resistant & Stable: Key components are made of 8mm thick 16Mn high-strength wear-resistant steel. Optimized steel structure and wear resistance extend service life and guarantee long-term continuous stable operation.

Compact Structure: Compact structural design (4×6×8m). Floor area reduced by over 50% compared with traditional classifier (9×5×12m). The feeding height is lowered by 5~10 meters, simplifying lifting process. Installation cycle is shortened to 3~4 days to cut investment cost effectively.

Simple & Efficient: High production efficiency, single machine capacity reaches 10~15t/h, nearly twice that of traditional classifier (6~7t/h). Easy maintenance, only need to add engine oil to classifier and fan monthly with no extra maintenance cost. While traditional classifier requires regular maintenance for four cyclone barrels, vulnerable material throwing discs and complex pipelines under complicated working conditions.

Smooth Operation: Main machine and fan adopt independent supports fixed separately on concrete foundation. Material isolation reduces resonance impact to guarantee stable equipment operation.

Wide Application: Optimized design and anti-sticking technology completely eliminate black slag contamination. The produced high-purity calcium hydroxide powder can flexibly meet diversified demands of high-quality calcium hydroxide powder industries such as grey calcium powder and putty powder.

Calcium Hydroxide Classifier Process Flow

Feeding & Dispersion

Digested calcium hydroxide is fed into calcium hydroxide classifier by feeder, falls directly onto high-speed rotating spreading disc, gets dispersed and thrown outward under centrifugal force to effectively prevent calcium hydroxide agglomeration.

Precise Classification

Then the high-speed rotating rotor generates centrifugal force to throw unqualified coarse powder to the machine wall, which is discharged from the bottom under gravity. Meanwhile, high-pressure fan creates upward airflow to send qualified calcium hydroxide powder into collection system, so as to realize precise classification of 200~600 mesh calcium hydroxide powder (500 mesh passing rate ≥95%).

Closed-circuit Process: The separated coarse powder returns to limestone digester for re-digestion to form closed circulation, or returns to grey calcium mill for further grinding and classification to form closed circulation.

Open-circuit Process: The separated coarse powder is discharged from the system as waste or low-quality product.

Finished Product Collection

Qualified calcium hydroxide powder flows with upward airflow through top outlet into single cyclone collector for gas-solid separation to obtain finished products.

Application of Calcium Hydroxide Classifier

Technical Parameters of Calcium Hydroxide Classifier

Frequently Asked Questions of Calcium Hydroxide Classifier

Why does the calcium hydroxide classifier not adopt the commonly used double cyclone collector?

Calcium hydroxide is prone to adhesion and deliquescence. The single cyclone collector features simple system, concentrated heat and few air leakage points, which can effectively prevent adhesion and blockage of calcium hydroxide.

What scenarios suit open-circuit and closed-circuit processes of calcium hydroxide classifier?

Coarse powder returns to limestone digester (closed-circuit): Suitable for limestone raw materials with over-burning or under-burning. Secondary digestion via coarse powder reflux improves conversion rate of quicklime and activity of calcium hydroxide, mainly applied in environmental protection fields such as wastewater treatment and desulfurization.

Coarse powder returns to grey calcium mill (closed-circuit): Suitable for scenarios requiring fine calcium hydroxide and valuable coarse powder recovery. Re-grinding of coarse powder realizes precise particle size control and improves added value of calcium hydroxide, mainly applied in high-end fields such as food and medical industries.

Coarse powder directly discharged (open-circuit): Generally used for scenarios with low fineness requirements of calcium hydroxide. Simple process and low investment cost, mainly applied in building mortar, wall putty powder and other building material fields.

Is the calcium hydroxide classifier installed before or after the grey calcium mill?

In the calcium hydroxide production line, pre-classification technology is adopted. The classifier is installed before the grey calcium mill. It can classify digested calcium hydroxide and directly select qualified fine calcium hydroxide powder as finished products, improve the purity of finished calcium hydroxide powder, avoid invalid and excessive grinding, reduce load and energy consumption of grey calcium mill, and boost efficiency and stability of the whole production line.