Disc Thickener

What is a Disc Thickener?

disc thickener is a highly efficient thickening and recovery device in the papermaking pulping process, primarily used to process low-concentration pulp. It increases pulp concentration and recovers useful fibers from white water through mechanical filtration, playing a crucial role in improving production efficiency and water resource recycling.

What are the applications of a disc thickener?

This equipment is a continuous rotary thickener, mainly used for dewatering and concentrating pulps with low freeness (high beating degree), short fibers, or high pulp concentration, such as mechanical wood pulp, waste paper pulp, reed pulp, bamboo pulp, stubble pulp, and straw pulp.

Its working process can be figuratively understood as two steps: "suction" and "scraping," and the entire process is continuous and automated:

Pulp Adsorption: The core component of the equipment is multiple filter discs mounted on a hollow main shaft. As the filter disc slowly rotates in the pulp tank, under the combined action of gravity and the pressure difference between the inside and outside of the disc, the water (white water) in the pulp passes through the filter screen or sieve plate on the surface of the disc, enters the interior of the disc, and finally collects in the central pipe for discharge. The pulp fibers are trapped on the surface of the filter screen, forming a wet pulp layer.

Filter cake removal: As the filter disc continues to rotate, the fan-shaped section adsorbing the pulp layer rotates out of the pulp surface. At this time, a high-pressure water spray device installed above the equipment sprays water to peel the formed pulp layer (i.e., the filter cake) off the filter disc, which falls into the discharge trough, completing the concentration process.

What are the advantages of a disc thickener?

Compared with traditional thickening equipment (such as rotary screen thickeners), disc thickeners have the following significant advantages: