Mixed Fertilizer

Mixed Fertilizer Chemische Eigenschaften,Einsatz,Produktion Methoden

• Landwirtschaftliche Anwendung

  A mixed fertilizer is any homogeneous product containing two or more plant nutrients. It usually contains two or more major nutrients. It is made chemically, or by blending, or by both methods. A mixed fertilizer may include micronutrients and secondary nutrients.
  Mixed fertilizers, which are also called compound fertilizers or complex fertilizers or fertilizer mixtures, are generally granular, free flowing and easy to apply uniformly. They have a relatively high nutrient content. Among examples of mixed fertilizers are nitrophosphates
  Fertilizers may also be physically mixed, with or without an inert material necessary to make up the required grade, and without allowing a chemical reaction.
  The physical mixture of a fertilizer is generally classified as homogeneous or heterogeneous. In homogeneous mixtures, the molecules are interspersed, as in a mixture of gases or in solution. Heterogeneous mixtures have distinguishable phases, like in a mixture of iron filings and sulphur. Unlike compounds, mixtures can be separated by physical methods like distillation, crystallization, etc.
  Fertilizer solids of different densities and sizes are mixed in a double-cone blender or with agitators for a defined period; mixing for too long or too short a period causes the components of the fertilizer mixture to separate and this must be avoided. Mixed salts production during ammonium sulphate manufacture
  Mixed salts of ammonium sulphate and ammonium nitrate are made by ammoniating a mixture of sulphuric acid and nitric acid or by combining these ammonium salts in special ways to form three double salts identified below:
  NH₄)2SO₄.NH₄NO₃, (NH₄)₂SO₄.2NH₄NO₃,and (NH₄)2SO₄·3NH₄NO_{3 One German process produces containing 62% ammonium sulphate and 38% ammonium nitrate, by ammoniating the requisite mixture of sulphuric and nitric acids. The mixture is evaporated to a moisture content of 3 % About 1 % ferrous sulphate is added to prevent caking. The double salt is granulated after spraying ammonia solution.
  In a simpler process, ammonium nitrate solution is evaporated to 95% concentration, cooled to 130°C and reacted with solid ammonium sulphate in a pug mill granulator until a pH of 4.0 is attained. The product is then dried, cooled and bagged. Prilling can also be adopted.
  The TVA (Tennesse Valley Authority) produced ammonium sulphate-ammonium nitrate contains 30 % nitrogen. It is used mainly for sulphur-deficient soils. This product is also made by ammoniation of a mixed acid followed by pan granulation of the resulting slurry. Its storage properties are superior to those of ammonium nitrate or a mixture of solid ammonium nitrateammonium sulphate since free ammonium nitrate is absent.
  When mixtures of sulphuric acid and phosphoric acid are ammoniated, a variety of mixed and double-salt products can be made. One of the popular compositions is 'ammophos' containing 16% nitrogen (N) and 20% phosphorus (as P2O5). The ammoniated slurry is granulated in a pug mill or a drum unit, dried and screened. The mixed salt has good storage properties under normal conditions.
  Many methods have been developed to recover sulphur from flue gas, involving scrubbing with ammonia or injection of ammonia into flue gas. From these reactions, ammonium sulphite, bisulphite, sulphate and their mixtures result. Because the demand for ammonium sulphate fertilizer is low, the sulphur from the flue gases is disposed of as calcium sulphate.}

Mixed Fertilizer Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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