How Much Do Powder Pretreatment Requirements Vary Across Industries?

Despite being applied to powders, pretreatment equipment and process requirements differ significantly across industries such as food, pharmaceuticals, chemicals, and new energy. Product standards, material properties, and regulatory compliance vary greatly, necessitating tailored pretreatment solutions for each.

Pharmaceutical Industry: Compliance First, Ultimate Cleanliness

Pharmaceuticals have some of the most stringent pretreatment requirements, with processes strictly adhering to GMP standards. Material requirements: all product-contact parts must be made of 316L stainless steel with mirror-polished internal surfaces and no dead zones to facilitate thorough cleaning and disinfection, preventing cross-contamination from drug residues. Secondly, pulverizing and sieving equipment must be designed for closed, dust-free operation to prevent drug powder dispersion and external contamination. Additionally, equipment must provide parameter traceability, recording processing parameters such as pulverizing speed, sieve mesh size, drying temperature, and duration for each batch to enable quality traceability. For traditional Chinese medicine powders, low-temperature pulverizing equipment is often used to prevent heat-induced degradation of active ingredients.

Food Industry: Safety as the Foundation, Preserving Flavor
Food industry pretreatment revolves around "food safety" and "flavor preservation." Similar to pharmaceuticals, food-contact parts must be made of food-grade 304/316 stainless steel, compliant with food hygiene standards. Food powders are diverse with varying properties: spices containing volatile oils require low-temperature water-cooled pulverizers to prevent flavor loss due to heat; heat-sensitive materials like protein powders and milk powder require low-temperature drying methods such as freeze-drying or low-temperature vacuum drying to avoid protein denaturation. Furthermore, the food industry frequently changes products, so pretreatment equipment must be easy to disassemble and clean to prevent flavor mixing between batches.

Chemical Industry: Durability First, Efficiency Priority
Chemical industry pretreatment prioritizes "durability" and "processing efficiency." Many chemical powders are corrosive or abrasive (e.g., pigments, fillers, chemical raw materials). Equipment material selection is critical, with options including acid/alkali-resistant stainless steel, plastic-lined, and ceramic materials. Chemical raw materials are generally hard, causing rapid wear on pulverizing and conveying equipment. Therefore, equipment is treated for wear resistance, such as lining with wear-resistant ceramics or using wear-resistant alloy blades. Compared to pharmaceuticals and food, the chemical industry has slightly lower cleanliness requirements but is more sensitive to capacity and energy consumption. It favors large-capacity, continuous pretreatment equipment like Raymond mills and air classifiers.

New Energy Lithium Battery Industry: High Cleanliness + High Safety Standards
The new energy lithium battery sector is a recent high-demand field where pretreatment demands "high cleanliness" and "high safety." Cathode and anode materials for lithium batteries are extremely sensitive to metal impurities; even trace amounts of iron or copper can cause short circuits. Thus, pretreatment lines incorporate multi-stage high-precision magnetic separation equipment with de-ironing precision reaching the ppm level. Additionally, lithium battery powders (e.g., graphite powder, ternary materials) are often flammable and explosive. All pretreatment equipment must feature explosion-proof designs and inert gas blanketing throughout the process to eliminate dust explosion risks. Moreover, strict particle size distribution control is required, often using high-precision air classifiers to ensure stable battery performance.