Pelletizing History Related


Scientists and politicians alike expect the world's population to grow by 80 million people a year. In addition to the ecological problems caused by the rapid population growth, the pressure of food and energy brought by the population is also becoming more and more concerned by people. Although the world economy has gradually recovered from the oil crisis in the 1970 s and early 1980 s, the importance of energy has also been paid more and more attention, because energy is limited, and various industries are striving to reduce energy consumption in order to reduce costs. Therefore, more attention has been paid to technologies that unnecessarily consume large amounts of energy. A typical example is the commonly used wet granulation technology, which requires the addition of water in order to bind the particles, and then drying to remove the water to obtain a stable product.

150 years ago, Li Bigg (1803-1873) discovered that the nutrients consumed by plant growth can be supplemented by applying fertilizers containing N, P and K. Since then, fertilizer science and technology have developed. Agricultural research has not only found that different plants and soils require different nitrogen, phosphorus, and potassium, but also at least 10 trace elements are also very important. Multi-element compound fertilizers have developed immediately. Natural and synthetic fertilizers have enabled dwindling arable land to feed a growing population. Today, if the climate is normal and fertilizers are applied to different crops and soil requirements, the same land can support seven times as many people as it did in the early 19th century.

Modern agriculture has been mechanized, and pre-prepared fertilizers are needed to obtain the benefits of * * * * *. Chemical fertilizer technology has undergone great changes in the past. Low-nutrient products are becoming more and more unpopular because of their selling price. 15% of it is used for transportation, storage and packaging. However, high-concentration nutrient fertilizers are generally fine powder. If it is not because the raw materials will be layered or agglomerated during storage and transportation, it is feasible to mix them. In addition, when powder fertilizers are applied, the equivalent fertilizer will be blown away by the wind or washed away by rain from the roots of plants. In order to overcome the above shortcomings, there are two kinds of fertilizer technology developed rapidly, namely granulation technology and liquid fertilizer. The disadvantage of liquid fertilizers is the low nutrient content, especially the potassium content. However, liquid fertilizers have obvious advantages for hot and humid areas, because they do not have deliquescence problems during storage, and they are relatively simple to transport and use.

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