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Peripheral drive thickener key to efficient mineral processing

2024-05-23 Xinhai (227)

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Peripheral drive thickeners are important equipment used in the mineral processing and wastewater treatment industries, specifically designed to increase the solids concentration in the slurry by removing excess water, thereby producing a thickened slurry or paste.  Unlike center drive thickeners, peripheral drive thickeners have a peripheral drive system that ensures consistent, efficient operation even in large-scale applications.

Working principle of peripheral transmission thickener

Peripheral drive thickeners operate on the settling principle, where solid particles settle under the influence of gravity and clarified liquid is removed.  Here is a detailed step-by-step description of its operation:

1. Feed introduction

The feed slurry containing solid particles and liquid is introduced into the thickener through a feed well located in the center of the tank.  This feed is often pretreated with flocculants to promote the formation of larger particle flocs, allowing for more efficient settling.


Flocculants, chemicals that promote the aggregation of fine particles into larger flocs, are added to the feed slurry.  This process significantly increases the settling rate of the particles, resulting in faster and more efficient thickening.

3. Precipitation

As the slurry flows radially outward from the center, gravity causes the solid particles to settle to the bottom of the tank, forming a dense sludge layer.  The clarified liquid rises to the top and is directed to the overflow weir.

4.Rake mechanism

The rake mechanism is driven by a motor installed on the periphery of the water tank and rotates slowly.  The rake arms are equipped with blades that gently move settled sludge toward a central discharge point.  This continuous raking action prevents sludge compaction and ensures uniform consolidation and removal of settled solids.

5. Clarify spills

The clarified liquid, now free of most solid particles, flows over the peripheral weir into a collection tank.  Depending on the requirements of the application, the overflow liquid can be recycled back into the process or drained.

6. Sludge discharge

The concentrated sludge is discharged continuously or intermittently from a central discharge point.  The discharge rate is carefully controlled to maintain the required underflow density, ensuring efficient separation of solids from liquids.

Advantages of Peripheral Frame Driven Concentrators

Peripheral transmission thickener features efficient solid-liquid separation, high throughput, and solid structure.

Peripheral drive thickeners offer several advantages that make them the first choice for many industrial applications:

1. High throughput

Peripheral drive thickeners are capable of handling large volumes of slurry, making them suitable for high-volume mineral processing operations.

2. High-efficiency solid-liquid separation

The use of flocculants and the effective design of the rake mechanism ensure effective separation of solids from liquids, resulting in higher underflow density and clearer overflow liquid.

3. Low operating costs

The perimeter drive system features an energy-efficient design that requires minimal maintenance, reducing overall operating costs. 

4. Versatility

Peripheral drive thickeners are used in a wide range of applications including mineral processing, wastewater treatment and chemical processing industries.

5. Sturdy structure

These concentrators are built with durable materials to withstand harsh operating conditions, ensuring a long service life.

Application of peripheral transmission thickener

Peripheral drive thickeners are used in a variety of industries, including:

1. Ore dressing

Used to concentrate ore and remove excess water from the slurry, improving the efficiency of downstream processing steps.

2.Wastewater treatment

Helps clarify wastewater by removing suspended solids, thereby improving the quality of treated water.

3. Chemical processing

Used in the chemical industry to separate solids from liquids in various chemical production processes.

Peripheral drive thickeners are an important part of modern mineral processing and wastewater treatment operations.  Its ability to effectively separate solids from liquids, coupled with its high throughput and low operating costs, makes it an indispensable tool in these industries.  By understanding how it works and its benefits, industries can leverage this technology to improve processing efficiency and achieve better operational outcomes.

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