Q1: What Is an Automatic Vertical Bottom Discharge Scraper Centrifuge?

An Automatic Vertical Bottom Discharge Scraper Centrifuge is a batch centrifuge designed for solid–liquid separation. It uses centrifugal force to separate solids from liquids and automatically discharges the solid cake through the bottom of the machine using a scraper system.

Key features

• Vertical shaft design
• Automatic cake scraping and discharge
• Enclosed operation for safety and cleanliness
• Suitable for crystalline, granular, or fibrous solids

This design is especially popular in regions where process stability, operator safety, and consistent product quality are top priorities.

Q2: How Does a Bottom Discharge Scraper Centrifuge Work?

The operating cycle typically includes the following steps:

• Feeding

Slurry is fed into the rotating basket.

• Centrifugal Separation

Centrifugal force drives liquid through the filter medium while solids form a cake on the basket wall.

• Washing (Optional)

Wash liquid can be introduced to remove impurities from the solid cake.

• Drying

Continued rotation removes residual moisture.

• Automatic Scraping & Bottom Discharge

A scraper mechanism removes the cake, which falls downward for collection.

Because discharge is automated, the system reduces manual intervention and improves repeatability—an important factor for pharmaceutical and chemical plants worldwide.

Q3: Why Is Bottom Discharge Preferred Over Side Discharge?

Bottom discharge offers several practical advantages:

• More complete cake removal
• Reduced residual solids inside the basket
• Cleaner operation and easier downstream handling
• Better compatibility with enclosed production lines

For customers in the US and regulated markets, this also supports GMP and environmental compliance by minimizing product loss and dust exposure.

Q4: What Industries Commonly Use Automatic Scraper Centrifuges?

These centrifuges are widely applied in:

• Chemical and fine chemical processing
• Pharmaceuticals and APIs
• Food ingredients and additives
• Fertilizers and inorganic salts
• Environmental and wastewater treatment

In Southeast Asia and Belt & Road regions, they are often chosen for robust performance under varying feed conditions and long continuous service life.

Q5: What Are the Common Types of Automatic Vertical Bottom Discharge Scraper Centrifuges?

Different process requirements have led to several well-established designs.

1. Platform Base Type (LGZ / PGZ Series)

These models feature a stable platform base structure that supports high load capacity and smooth operation.

They are often selected for:

• Large batch sizes
• Heavy or dense solids
• Long operating cycles

Solutions such as LGZ/PGZ Automatic platform base bottom discharge scraper centrifuges are commonly used in chemical and fertilizer plants where durability is critical.

2. Top-Suspended Type (PAUT Series)

In this design, the centrifuge basket is suspended from the top, reducing floor vibration and simplifying maintenance access.

Key advantages include:

• Lower foundation requirements
• Easier cleaning
• Good performance with fine crystals

PAUT Top-suspended bottom discharge scraper centrifuges are frequently chosen in pharmaceutical and specialty chemical applications.

3. Bag-Shaking Type (PGD Series)

Bag-shaking centrifuges use a filter bag combined with a shaking or vibration mechanism to enhance cake discharge.

They are suitable for:

• Fine or sticky materials
• Products with higher filtration resistance
• Applications requiring flexible filter media

For difficult-to-separate solids, PGD Bag-shaking bottom discharge scraper centrifuges provide improved discharge efficiency.

Q6: What Are the Main Benefits of Using an Automatic Scraper Centrifuge?

Compared with manual or semi-automatic centrifuges, automatic scraper centrifuges offer:

• Reduced labor requirements
• More consistent cake moisture
• Higher operational safety
• Better suitability for automation and control systems

These advantages are particularly important for manufacturers aiming to scale production while maintaining quality standards.

Q7: What Are Common Operating Challenges and How Can They Be Solved?

1. Incomplete Cake Discharge

Possible causes

• Improper scraper adjustment
• Inappropriate filter medium

Solutions

• Optimize scraper angle and pressure
• Select the correct filter cloth or bag

2. High Vibration During Operation

Possible causes

• Uneven cake formation
• Excessive feed rate

Solutions

• Stabilize feed conditions
• Adjust batch parameters

3. Moist Cake After Drying

Possible causes

• Insufficient drying time
• Low centrifugal force

Solutions

• Extend drying cycle
• Adjust rotation speed

Q8: How Do You Choose the Right Model for Your Project?

When selecting an automatic vertical bottom discharge scraper centrifuge, consider:

• Material properties (particle size, stickiness, corrosiveness)
• Required batch capacity
• Automation level
• Local regulations and safety standards

Many international customers prefer to evaluate platform base, top-suspended, and bag-shaking designs side by side before finalizing their choice.

Final Thoughts

Automatic Vertical Bottom Discharge Scraper Centrifuges are a proven solution for industries that demand reliable separation, automated discharge, and scalable production.

Whether your priority is structural stability, ease of maintenance, or handling difficult materials, options such as LGZ/PGZ, PAUT, and PGD series centrifuges provide flexible solutions for a wide range of applications.

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