The disc granulator can process tofu cat litter, bentonite cat litter, and organic fertilizer mixed cat litter. It forms the litter using a rolling process, which consists of five steps: raw material pretreatment, feeding and humidification, rolling and forming, disc cleaning and discharge, and drying, cooling, and screening.

The raw materials are first crushed and proportioned. Tofu cat litter is mainly composed of soybean residue and corn starch, while bentonite cat litter is mixed with mineral powder and a binder. All materials are crushed to a fine powder of 80-100 mesh. Lumpy materials are pre-screened and broken to ensure a fine and uniform powder, preventing hollow particles after molding. After proportioning, the powder is fed into the granulation disc. The dry powder is non-sticky, so a spray system is used to atomize and spray water. The starchy raw materials become sticky when they come into contact with water, forming small core pellets.

The tilted disc rotates at a uniform speed. The material continuously tumbles under the action of gravity, centrifugal force, and friction. The core pellets continuously absorb the outer layer of powder, growing larger layer by layer. The particle size is controlled by adjusting the disc's rotation speed, tilt angle, and water spray volume. Too little moisture results in loose granules and excessive dust; too much moisture causes them to clump together, sticking to the pan walls and reducing the yield. Side scrapers continuously remove accumulated material from the pan walls to prevent thick clumps from interfering with rolling.

The formed granules overflow from the edge of the pan and are fed into a drum dryer. The drying temperature for cat litter is higher than that for organic fertilizer; bentonite cat litter is dried at around 120℃, and tofu cat litter at 90-110℃, thoroughly reducing moisture content and improving granule hardness and water absorption/clumping performance. After drying, the granules are cooled by a cooler and then screened for standard particle size using a grading sieve. Excessively large or small pieces are returned to the pan for secondary granulation.

During production, wear-resistant, thickened scrapers are required because the raw material contains high-hardness mineral powder, causing ordinary scrapers to wear out faster. Ultra-fine atomizing nozzles are used for spraying to reduce localized water accumulation and material adhesion. The entire process is highly continuous, producing rounded cat litter granules with less dust. The equipment investment cost is low, making it suitable for mass production in small to medium-sized cat litter processing plants.