Necessary features and modification of ammonium nitrate fertilizer grade ammonium nitrate nitrogen (N) 33% ~ 34%, and is commonly used by Europe, North America, and some in temperate countries of nitrogen fertilizer varieties. From crop nitrogen nutrition to evaluate demand for fertilizer, ammonium nitrate, with quick fertilizer effect of can supply ammonium and nitrate at the same time the advantages of the two different form nitrogen source, it is good for the growth of many crops. Facts have shown that a large number of application, in addition to a handful of rice paddy field crops, especially the crops in the dry fruit, vegetables, tobacco and other economic crops be fond of ammonium nitrate. But, from the fertilizer chemical properties to evaluate, ammonium nitrate is a kind of extremely easily soluble in water, has strong hygroscopicity and caking property and flammable and explosive nitrogen fertilizer varieties. These features not only bring considerable difficulties for agricultural use, also determines the ammonium nitrate if mismanagement in the storage, transportation, will cause fire or explosion. In fact, many countries in the world, including China, have serious accident caused by ammonium nitrate has happened before. To this end, China had banned ammonium nitrate into the fertilizer market.
In recent years, with the expanding of fertigation area, the increased demand for agricultural ammonium nitrate. Some enterprises will improve its performance to improve the quality as the goal, to try to appeared on the market of modified ammonium nitrate products. On technical transformation way, adopted the following three ways: first, the production of granular ammonium nitrate, and before the granulation add low hygroscopicity stabilizer or join insoluble inert material, such as bone, ground phosphate rock, dolomite, Gao Cen soil and diatomite, etc; Secondly, the use of film-former, on the surface of ammonium nitrate particles coated with a layer of protective film to isolate the air, the commonly used film-former with vegetable oil, mineral oil, resin and paraffin wax, etc.; Third, the appropriate change the components of ammonium nitrate, sulfur production calcium ammonium nitrate, ammonium nitrate and phosphate ammonium nitrate and so on. Some countries in Europe in the earlier period of agricultural application is expressly prohibited in the application of single ammonium nitrate, some manufacturers add ammonium sulfate, magnesium nitrate in ammonium nitrate, potassium chloride, calcium nitrate into compound mixed fertilizer usage. All above various technical approaches to improve the ammonium nitrate bad character.
The following introduction of calcium ammonium nitrate, which is a kind of modified ammonium nitrate products commonly used at home and abroad.
The properties of the calcium ammonium nitrate and calcium ammonium nitrate (formula NH4NO3 + CaCO3) is applied in molten ammonium nitrate and limestone powder on 60:40 of the proportion of mixed melting, useful also dolomite (a mixture of calcium carbonate and magnesium carbonate) and ammonium nitrate. About 20% of the nitrogen. As for the detailed composition, different manufacturer production products will have some differences. Is good for potassium group company lion continental calcium ammonium nitrate as an example, containing 27% of nitrogen (N), including ammonium nitrogen 13.5%, nitrate nitrogen, 13.5% calcium (CaO) 12%, the average particle size of 3.0 ~ 3.0 mm, weighs about 1.0 t/m3. Calcium ammonium nitrate the appearance of the color is gray or beige particles commonly, there are green. Ammonium nitrogen and nitrate nitrogen half, much less than the original ammonium nitrate nitrogen content. But its hygroscopicity is small, not easy to agglomerate, good dispersibility, has the good physical properties.
Contains a lot of calcium carbonate in the calcium ammonium nitrate, used as fertilizer has a good effect on acid soil and effects. In paddy field application, and its effectiveness was slightly lower than the nitrogen, such as ammonium sulfate, and in the dry land use, similar to those of ammonium sulfate fertilizer effect. Calcium ammonium nitrate nitrogen in the cost, higher than the cost of ordinary ammonium nitrate nitrogen, calcium ammonium nitrate as a low concentration of fertilizer is a kind of physiological neutral fertilizer, long-term fertilization on soil properties play a good role. Used as a fertilizer on cereal crops.
The nitrogen in the calcium ammonium nitrate particles can quickly released, and lime is dissolved slowly. In acidic soil of field experiment results showed that the calcium ammonium nitrate agronomy effect is good, can improve the total level of output.
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