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There are two cases of counterfeit urea appearing in the nitrogen fertilizer market: one is the mixing of urea and ammonium bicarbonate, that is, the upper layer of the fertilizer bag is urea, and the lower layer is ammonium bicarbonate. It is characterized by good fluidity, no flow or even agglomeration underneath, and can smell a pungent ammonia smell. When this happens, it can be concluded that ammonium bicarbonate is doped. The second is the mixing of urea and ammonium nitrate. The common point is: all white, odorless, fluid, and granulated fertilizers that burn white smoke. The difference is that the urea particles are large, translucent, loose, non-reflective and moist, and are quickly melted on charcoal or iron plates that are burned red, and ammonia gas with pungent and heavy smoked eyes is released; The ammonium particles are small, the surface is bright, and there is obvious reflection and moisture. The red charcoal or iron plate reacts violently, releases bubbles, and produces a "sweet" sound. Urea through the appearance, feel, fire and other tests, showing this different characteristics, indicating that the ammonium is mixed with ammonium nitrate, is a counterfeit urea.
Phosphate fertilizer market, such as phosphogypsum, calcium magnesium phosphate fertilizer, waste cement residue, etc., are mainly classified as follows: 1 Appearance. Calcium is dark gray or grayish white, light gray loose powder, sour; phosphogypsum is grayish white hexagonal granular crystal or crystalline powder, no sour; calcium magnesium phosphate, no sour, very dry vitreous fine Or fine powder; waste cement slag is gray powder, dull, with more hard materials, the granules are also coarser and have no sour taste after pulverization; the color of brick powder is blue, the powder is thicker and has no sour taste. 2 feels. Calcium is heavy, feels but not frivolous; Phosphogypsum has a light texture and feels dry; the waste cement is heavier than ordinary calcium, the hand is not greasy, it is not dry, it is not dry, and there is hard cement residue. 3 water soluble. The calcium is partially dissolved in water, the phosphogypsum and calcium magnesium phosphate are insoluble in water, and the waste cement powder is added with water to form a slurry, which is re-solidified. In the identification, if it is found that there are obvious impurities such as clods, stones, cinders, etc. in the ordinary calcium, it is inferior calcium; if it is found that the acidity is too rich and the water is more, it is a non-finished product that is not matured. Calcium.
In the compound fertilizer market, the granules are pretending to be nitrophosphate and heavy superphosphate. It is also useful to use pseudocalcium, nitrophosphate and ammonium thiophosphate to counteract diammonium phosphate. They have similar color, particle and compressive strength, but the composition, content and price of the particles are very different. The phosphorus content of the superphosphate is 14-18%, the phosphorus content of the calcium is 40-50%, and the phosphorus nitrate is contained. Nitrogen 20%, phosphorus 20%, diammonium phosphate phosphorus 46-48%, nitrogen content 16; -18%. 1 Appearance: The diammonium phosphate is not dark, the middle is dark brown, the edge is slightly yellow, the outer edge of the particle is slightly translucent, the surface is slightly smooth, and it is irregular particles; after damp, the color of the particles is deepened, no yellow and edge transparency. After immersion, the granules behave the same as the wetted granules and have a very small amount of pinkish white on the surface. The nitrophosphate fertilizer has no obvious transparency, and the surface of the granule is smooth, and it is dark brown irregular particles. The heavy superphosphate granular fertilizer is dark gray granules, and the superphosphate is lighter in color, grayish, light gray, and the surface is less smooth. 2 Water solubility: nitrophosphate fertilizer, diammonium phosphate, and heavy superphosphate are all soluble in water, and the particulate superphosphate is not completely soluble in water. 3 fire: diammonium phosphate, nitrophosphate fertilizer on the red charcoal can quickly dissolve and release ammonia gas, heavy superphosphate and superphosphate without ammonia smell, especially the shape of superphosphate particles have not changed at all. According to the inherent characteristics and attributes of the above fertilizers, the authenticity and advantages and disadvantages can be distinguished.
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The quality of fertilizers can be quickly judged by methods such as “look, burn, touch, test, and measureâ€. The counterfeit identification methods for several types of major fertilizers are introduced as follows:
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