6–8 T/H Fertilizer Pellet Cooler in Chile

The project focused on approximately 3–5 mm organic fertilizer granules intended for soil improvement and nutrient management in horticultural production, orchards, and other agricultural applications. The customer wanted a more controlled cooling process, less accumulation of warm material before screening, and more consistent finished-product handling.

Rather than investing in a complete organic fertilizer pellet production line, the plant retained its existing mixing, granulation, and packaging equipment and added a dedicated cooler after the fertilizer granulator machine. This approach addressed a specific production bottleneck while keeping the scope of the investment manageable.

Why a Chilean Organic Fertilizer Producer Needed Better Cooling

Chile has a varied agricultural sector, including fruit production, vineyards, vegetable cultivation, and intensive horticulture. These industries use different soil management and fertilization practices, creating opportunities for commercial fertilizers and soil-conditioning products. Organic fertilizer manufacturers can serve farms and distributors that require granulated products suitable for bulk handling, transport, and controlled application.

The customer in this project operated a regional fertilizer processing facility supplying agricultural customers rather than a large integrated chemical fertilizer complex. Its raw materials included composted poultry manure, livestock manure-derived organic matter, and plant residues collected from agricultural activities. The exact formulation varied according to feedstock availability, compost maturity, nutrient targets, and the characteristics required in the finished product.

Before the upgrade, freshly formed granules moved from the granulation stage into downstream handling while still carrying substantial process heat. Depending on moisture content and formulation, these granules could be relatively warm and mechanically vulnerable. Material accumulated when the screening and conveying stages could not accept it at the same rate as the granulator discharged it. Operators consequently had to pay closer attention to material flow and avoid allowing the post-granulation section to become congested.

Cooling is important because finished fertilizer granules must be prepared for subsequent screening, conveying, storage, and packaging. Granules that are packed before they have cooled sufficiently may retain excess heat, and moisture migration or condensation under unsuitable storage conditions can contribute to caking. These risks depend on the material formulation, moisture level, packaging, and storage environment; a cooler is one part of controlling them rather than a substitute for proper moisture management.

The manufacturer decided that an additional cooling machine was a more practical solution than replacing the granulator or rebuilding the entire plant. The new unit would be installed after the existing granulation section, allowing hot granules to pass through a dedicated cooling stage before continuing to screening and finished-product handling.

Selected Model: RICHI SKLF17*17 Counterflow Cooler

RICHI recommended the SKLF17*17 model for this medium-scale application. Its listed rated throughput is 6–8 T/H, with a drive power of 1.5 kW. This capacity range provides a reference for matching the cooler to the expected production rate of the existing granulator, although the final working capacity must be confirmed using the actual fertilizer formulation and operating conditions.

The SKLF17*17 uses a counterflow cooling arrangement in which cooling air moves against the direction of material travel. This arrangement supports progressive heat removal as granules pass through the cooler. The reference cooling time is approximately 6–15 minutes, and the listed discharge temperature is around 3–5°C above ambient temperature under suitable operating conditions.

These figures are equipment reference specifications rather than guaranteed results for every fertilizer formulation. Organic fertilizer granules can differ considerably in density, porosity, moisture content, surface condition, and mechanical strength. The actual cooling performance depends on these properties, the inlet temperature, airflow, material-bed depth, ambient conditions, and operating rate. The final configuration should therefore be checked against the customer's production data before installation.

What the Fertilizer Pellet Cooler Processes

The plant's principal product is granulated organic fertilizer made from composted manure-based material and selected agricultural residues. Poultry manure can contribute organic matter and plant nutrients, while suitable plant residues help form part of the composting feedstock. Livestock manure-derived materials may also be used when their quality and availability suit the formulation.

These materials require appropriate preparation before granulation. Composting and maturation help stabilize organic feedstocks, while screening and size reduction may be necessary to achieve a more uniform mixture. The formulation must also be managed for moisture, particle distribution, and binding characteristics so that the granulator can produce granules with suitable strength and size.

For this project, 3–5 mm granules were selected as the representative finished-product specification. Granules in this range can be suitable for bagged organic fertilizer and soil-conditioning products, subject to the customer's product design and the requirements of the intended application. The granulator determines the initial granule formation, while the cooling machine reduces product temperature before the granules proceed to screening and packaging.

Once discharged from the granulator, the hot fertilizer granules enter the cooler and pass through a controlled cooling process. The cooled material then moves to the screening section, where fines and out-of-specification particles can be separated. Accepted granules are conveyed to storage or packaging, depending on the plant's product handling arrangement.

The cooling stage does not replace drying or compost maturation. If the incoming material contains excessive moisture or has not reached the required degree of stability, cooling alone will not correct those problems. The plant must control the upstream preparation process and use cooling to manage the temperature of properly formed granules.

How the Counterflow Design Supports Consistent Granule Handling

One of the main requirements in fertilizer granule cooling is uniform material distribution. If granules form an uneven bed inside the cooling chamber, airflow can pass more easily through thinner sections while thicker areas receive less effective cooling. The result may be variation in discharge temperature even when the average production rate appears satisfactory.

The SKLF series  uses a four-way adjustable distributor to spread incoming material across the cooling chamber. This helps the plant establish a more even material bed and make better use of the available cooling area. Mechanical material-level control supports stable operation by helping maintain the required level of material in the chamber.

The SKLF Counterflow Pellet Cooler also uses a swing-flap discharge mechanism controlled by a flexible hydraulic transmission system. The discharge arrangement is designed to release cooled material smoothly, reducing unnecessary impact that could damage mechanically weak granules. This is particularly relevant when finished-product appearance and the proportion of intact granules matter to the customer.

The octagonal cooling chamber is designed to reduce dead zones where material might otherwise remain trapped. A curved discharge hopper supports material flow and helps limit residue accumulation. Stainless steel is used for the upper section of the cooler and the rotary airlock feeder to improve corrosion resistance in areas exposed to material and normal operating conditions.

For larger cooling applications, an optional powered rotary leveling mechanism can help maintain a more uniform material layer. Although this feature is not necessarily required for every medium-capacity installation, it can be considered when the material has uneven flow characteristics or when the project requires closer control of the bed distribution.

Why the Customer Bought One Machine Instead of a Complete Line

The customer's existing plant already had equipment for raw-material preparation, mixing, granulation, and packaging. The main limitation was the handling of hot granules after the granulator. Replacing the entire line would have involved a broader capital investment, additional installation work, and more disruption to normal production.

Adding one fertilizer pellet cooler offered a more focused alternative. The upgrade was intended to create a dedicated cooling stage between granulation and screening, improving the flow of material through the downstream section without changing every machine in the plant.

This type of project requires more than choosing a cooler based on its rated throughput. The incoming granulator must supply material at a suitable rate, while the screening equipment, conveyors, and packaging section must be able to handle the cooled output. If one of these stages has insufficient capacity, increasing cooling capacity alone will not remove the overall production bottleneck.

The SKLF17*17's listed drive power is 1.5 kW, but this figure should not be interpreted as the total electricity demand of the complete cooling arrangement. Depending on the installation, the cooling system may also require a fan and other auxiliary equipment. The electrical plan should account for all supplied and connected components.

Installation and Operating Considerations for Organic Fertilizer

Organic fertilizer granules behave differently from conventional animal feed pellets. Their moisture content, density, porosity, surface condition, and mechanical strength depend on the composted materials, formulation, binder, and granulation process. These factors influence the way the material moves through the cooler and how effectively heat is removed.

For this Chilean project, the installation review should establish the actual granulator output, typical granule diameter, inlet temperature, material moisture, available installation height, and downstream conveyor capacity. The cooler's inlet and outlet connections must also match the plant layout, allowing material to pass through without unnecessary transfer points or excessive drops.

RICHI can provide equipment dimensions, layout information, interface guidance, and model-selection support to help coordinate the new machine with the existing line. Reviewing these details before shipment reduces the risk of avoidable installation changes and helps the customer prepare the required foundations, electrical connections, access space, and maintenance clearances.

During commissioning, operators should observe the distribution of granules inside the chamber, check the material-level control, and verify the discharge mechanism. Inlet and outlet temperatures should be recorded at a stable operating rate. If the granules are not cooling evenly, the first checks should include material distribution, airflow, feed rate, bed depth, and incoming moisture rather than simply increasing the production rate.

Routine maintenance should include inspection of the drive components, discharge mechanism, seals, air passages, and areas where fertilizer dust or residue may accumulate. Regular cleaning and inspection are particularly important when the plant processes different formulations, since residual material can contaminate subsequent batches or affect the flow of the next product.

Shipping from Qingdao Port to San Antonio, Chile

The equipment is planned for sea shipment from Qingdao Port in China to the Port of San Antonio in Chile. San Antonio is a major Chilean commercial port and a practical destination for imported industrial machinery serving the country's agricultural and manufacturing sectors.

Before dispatch, the equipment should be checked against the agreed order specifications, including the model designation, drive rating, supplied components, protective packaging, and shipping documents. Clear identification of the main machine and accessories makes arrival inspection and installation preparation more straightforward.

The importer should confirm the applicable machinery import requirements and shipping documentation for the specific consignment before dispatch. These requirements should be checked against the current rules and the details of the actual shipment rather than assumed to be identical for every import order.

Customer Feedback: Easier Coordination Between Granulation and Screening

After the cooler was integrated into the existing production arrangement, the plant's operating team placed particular emphasis on the transition between granulation, cooling, and screening. The practical value of the upgrade was not simply the presence of another machine; it was the opportunity to control the temperature and movement of granules before they reached the next process stage.

The production manager's assessment focused on three points: whether the cooler could accept the granulator's normal discharge, whether the cooled material could move steadily into screening, and whether operators could adjust the process without repeatedly interrupting production. The team also monitored the condition of granules after discharge, since excessive breakage would increase the amount of material requiring reprocessing.

For the plant, the most useful acceptance criteria were measurable operating indicators rather than a general claim of improved performance. These included stable material flow, consistent outlet temperature under comparable operating conditions, manageable fines generation, and reliable coordination with the existing screening and conveying equipment.

These operating checks provide a practical basis for evaluating the investment over time. If the plant later expands its output or introduces a different fertilizer formulation, the same records can help determine whether changes to airflow, feed rate, material distribution, or downstream handling are required.

A Practical Cooling Upgrade for Chilean Fertilizer Production

The fertilizer pellet cooler in Chile project demonstrates how a single cooling machine can address a specific process requirement in an existing organic fertilizer plant. By selecting the SKLF17*17 counterflow cooler, the manufacturer added a dedicated cooling stage for approximately 3–5 mm organic fertilizer granules without committing to a complete production line replacement.

The selected model has a listed throughput of 6–8 T/H, a drive power of 1.5 kW, and a typical cooling time of 6–15 minutes. Its counterflow arrangement, adjustable distributor, material-level control, swing-flap discharge mechanism, and chamber design are intended to support progressive cooling and controlled discharge. Actual results depend on the properties of the granules and the conditions under which the equipment operates.

For fertilizer manufacturers evaluating a pellet cooling machine, the most useful starting point is the actual material and production requirement. Granule size, inlet temperature, moisture content, bulk density, mechanical strength, and target throughput all affect equipment selection. The cooler must also fit the capacity of the granulator, screening system, conveyors, and packaging equipment.

RICHI Machinery can assist with model selection, equipment layout, technical coordination, and installation planning for fertilizer pellet cooling applications. Manufacturers considering a new installation or a targeted upgrade can provide their expected throughput, granule specifications, material moisture, inlet temperature, and existing process layout to identify a suitable cooling configuration.