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Nigeria is a major global producer and exporter of sesame seeds. Production is concentrated in the northern and north-central savanna regions—specifically in states such as Jigawa, Nasarawa, Benue, Kano, Katsina, Gombe, and Taraba—where the crop is primarily cultivated by smallholder farmers under rain-fed conditions. Nigerian sesame seeds are categorized into white and brown varieties: white sesame, sourced largely from Nasarawa and Benue, is well-suited for food-grade applications such as baking and the production of tahini (sesame paste), while brown sesame, primarily from Jigawa and Kano, is mainly used for oil extraction. Regardless of the variety, the raw sesame seeds often contain "stubborn" impurities, including clods of soil, sand, stones, weed seeds, shell fragments, and shriveled grains. Furthermore, the crop is frequently contaminated with cowpea or sorghum fragments during field harvesting, and additional sand, soil, and dust often find their way into the produce during transport from the northern growing regions. Achieving the purity levels required for export standards cannot be accomplished with a single piece of equipment; instead, a comprehensive processing line is necessary, incorporating stages for feeding, iron removal, air-screen cleaning, destoning, and grading.

Pinto beans are a type of common bean widely cultivated and consumed in North America and Central America. They are medium-sized, kidney-shaped, and feature a smooth surface with a mottled, speckled pattern. During the processes of harvesting, drying, transportation, and storage, various types of impurities—often complex in form—can become mixed in with the beans. These impurities are categorized as follows: first, "light" impurities, such as dust, fine particulate matter, husks, shriveled or empty pods, and lightweight weed seeds—all characterized by low specific gravity and a large surface area relative to their weight; second, "large" impurities, including straw, long stalks, pieces of twine, large stones, and other foreign objects that are significantly larger than the beans; third, "fine" impurities, such as sand, soil particles, and small debris, which are smaller in size than the beans; fourth, "heavy" impurities of similar size—stones, sand grains, or clods of earth that are comparable in dimension to the beans but differ in specific gravity, making them impossible to separate via standard sieving; and fifth, broken or defective beans, including those damaged during threshing or transport, as well as insect-damaged or moldy grains.

Taobo air screen cleaner is a core piece of equipment used in the cleaning process for grains and legumes. It integrates air separation and screening into a single unit, performing two-stage separation based on differences in both density and geometric dimensions between the material and its impurities. During operation, the material is fed uniformly into the machine. It first passes through a primary cleaning screen, which removes large impurities such as straw, twine, and stones. The material then enters the air-separation zone, where an adjustable airflow—generated by a high-pressure fan—carries away light impurities (such as husks, broken grains, dust, and shriveled seeds) into a settling or dust-collection system. Meanwhile, heavy impurities (like stones, clods of soil, and metal fragments) are separated via a gravity-based channel. Finally, the material moves to a grading screen, where it passes through multiple layers of screens with varying aperture sizes; this process sorts the material by size while removing medium and small impurities. Through the combined action of the airflow and the screening surfaces, the machine achieves continuous cleaning: light impurities are removed by air, heavy impurities are discharged from the bottom, and the cleaned, qualified product is recovered.

A buyer-focused guide to checking whether a grain magnetic separator fits your crops and plant layout. It covers the listed capacity, magnetic surface width, magnetic field strength, construction material, speed control and conveying structure of the Hebei Taobo Machinery Co., Ltd. Magnetic Separator, and explains what to confirm with a magnetic separator manufacturer before you order.

Red kidney beans are highly favored in the international market for their plump shape, vibrant red color, and rich nutritional content. However, to meet the quality standards required for export, the beans must undergo a series of meticulous processing steps—including cleaning, destoning, gravity separation, and polishing—as they transition from the field to the final export-ready product. Among these, the polishing machine serves as a critical piece of equipment for enhancing both the appearance and purity of the beans, playing an indispensable role in the entire cleaning and processing line.

Soybeans and sesame seeds are two oil-bearing crops with vastly different physical characteristics. Soybeans have large, round, and dense grains with smooth surfaces (approximately 6–9 mm in diameter), whereas sesame seeds are small, lightweight, and prone to sticking together, with a high oil content. During harvesting, drying, storage, and transportation, both crops can become contaminated with various impurities: "large" debris (such as stalks, pod husks, soil clods, and stones), "small" debris (such as broken grains, fine sand, dust, and weed seeds), and "co-sized" impurities—particles similar in size to the crop grains but differing in density, including certain stones, mud clods, insect-damaged grains, and moldy grains.