The drum dryer is a drying equipment that uses the rotation of a drum to allow the heat medium (such as hot air, steam, etc.) to fully contact with the materials, achieving moisture evaporation. Due to its strong applicability and high efficiency, it is widely used in various industries. The following are the main categories of raw materials that it can dry and specific examples:
1. Agricultural and agricultural product category
These raw materials usually contain a high amount of natural moisture and need to be dried to extend storage time or facilitate further processing.
Grain types: wheat, corn, rice, sorghum, etc., after drying, they can prevent mold and ensure the quality of grains.
Oil-bearing crops: rapeseed, peanuts, soybeans, etc., reducing the moisture content helps with subsequent oil extraction processing.
Others: forage, straw, etc., after drying, they can be used as feed or biomass fuel.
2. Mineral and building materials category
Many minerals and building materials contain moisture after mining or processing, and need to be dried to meet subsequent production or usage requirements.
Mineral types: iron ore powder, copper ore powder, manganese ore powder, lead-zinc ore powder, etc., after drying, it is easier for beneficiation and smelting.
Non-metallic minerals types: quartz sand, limestone, dolomite, kaolin, bentonite, talc powder, etc., can improve product purity and stability, used in building materials, ceramics, chemical industries, etc.
Building materials types: sand, stone, cement clinker, fly ash, slag, etc., after drying, ensure the strength and performance of building materials products.
3. Industrial raw materials and chemical category
Many raw materials in industrial production need to control moisture to ensure the stability of the production process and product quality.
Chemical raw materials: sodium bicarbonate, sodium sulfate, ammonium sulfate, potassium nitrate, etc. chemical crystals, as well as various pigments, dye intermediates, etc.
Industrial waste residue types: calcium carbide slag, coal gangue, steel slag, etc., after drying, can be used for resource utilization, such as for brick production, cement admixture, etc.
Others: rubber particles, plastic particles (recycled materials), etc., after removing moisture, it is easier to process and shape.
4. Food and feed category
In addition to agricultural products, food processing and feed production also have many materials that need to be dried.
Food raw materials: starch, glucose, maltose, milk powder (concentrated liquid during processing drying), meat dry, fish meal, etc.
Feed raw materials: soybean meal, cotton meal, vegetable meal, bran, fish meal, bone meal, etc., after drying, can prevent feed from deteriorating and improve feed nutritional value.
5. Other special materials
The drum dryer can also adjust parameters according to the characteristics of the materials to dry some special materials, such as:
Sludge types: municipal sludge, industrial sludge, etc., after drying, reduce volume, facilitate subsequent landfill, incineration or resource utilization.
Biological materials types: wood chips, bamboo chips, straw pellets, etc., after drying, can be used as raw materials for biomass energy.
It should be noted that although the drum dryer has a wide adaptability to materials, whether it can dry a certain raw material also depends on the properties of the material (such as moisture content, viscosity, heat sensitivity, etc.). For example, for materials with excessive viscosity and easy agglomeration, pre-treatment (such as crushing, adding dispersants) may be required; for heat-sensitive materials (such as certain pharmaceutical raw materials), the drying temperature needs to be controlled to avoid material deterioration. In practical applications, the type and process parameters of the drum dryer that are suitable for the material (such as cross-flow type, counter-flow type, combined cross-flow type, etc.) and the parameters need to be selected based on the material properties.