Method for producing granular magnesium sulfate fertilizer
A production method and technology of magnesium sulfate, applied in the direction of magnesium fertilizer, inorganic fertilizer, fertilization device, etc.
Active Publication Date: 2011-04-20
营口菱镁化工集团有限公司
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Problems solved by technology
[0003] At the problems referred to above, the purpose of this invention is to provide a kind of method of direct production magnesium sulfate granular fertilizer, to solve the various problems that existing method produces product to exist
Method used
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Experimental program
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Embodiment
[0014] Weigh 500 kg of industrial sulfuric acid with a mass fraction of 92.5%, 340 kg of water, a particle size of 0-0.12, and 220 kg of lightly burned magnesia powder with a mass fraction of 85%. The above-mentioned materials are put into the stirring reactor in proportion, and the reaction time is 10 minutes. The reaction temperature is up to 150°C. Along with the reaction, a large amount of water vapor generated evaporates, and a large amount of reaction heat is taken away to gradually cool the reaction material. When the reaction material drops to 100°C, the material begins to solidify and agglomerate. Then the agglomerated material is crushed, and the crushing process is carried out by a hammer mill. After crushing, the material is dried, and the drying process is carried out by using an airflow dryer. First, the crushed material is put into the silo of the airflow drying device, and after being mixed with the tail gas of the secondary dryer through the feeder, the mate...
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Abstract
The invention discloses a method for producing a granular magnesium sulfate fertilizer, and particularly relates to a manufacturing method in which pneumatic drying and air classification are adopted. The method comprises the following steps of: after industrial sulfuric acid and caustic-calcined magnesium oxide powder serving as raw materials are reacted, crushing the materials; drying the crushed materials, transporting the materials into a first-stage dryer by using air flow for pre-drying and second-stage drying; and transporting the dried materials into a third-stage air classifying device to perform air classification. The method is simple, and is easy to implement. By the method, the granular magnesium sulfate fertilizer can be produced directly. The granular fertilizer produced bythe method has medium and uniform grain size, and the internal water content is greatly reduced after the granular fertilizer is dried by the air flow, so that the fertilizer is difficult to cake in storage. Due to the medium and uniform grain size, the fertilizer can be uniformly mixed with other fertilizers so as to prepare a mixed fertilizer, the compatibility is improved, and the fertility can be exerted to the maximum extent. Besides, as the granular fertilizer is directly produced by a one-step method, flying dust can be reduced, the working environment is protected, and the problems inthe prior art for producing a magnesium sulfate fertilizer are solved.
Description
technical field [0001] The invention discloses a production method of magnesium sulfate granular fertilizer, specifically a method for manufacturing magnesium sulfate granular fertilizer by adopting two-stage airflow drying and three-stage airflow classification. Background technique [0002] At present, magnesium sulfate fertilizer is mainly magnesium sulfate monohydrate. The production method uses light-burned magnesia, sulfuric acid and water as raw materials, neutralizes, cools, and pulverizes to make powdery fertilizer products, or makes granular fertilizers through granulation on the powdery basis. Because the water-containing massfraction of magnesium sulfate monohydrate is 10~30% (comprising free water and water of crystallization), so these two kinds of state products no matter which one all exists following problem: because the powdery product contains more water, in It is easy to agglomerate during storage. When making compound fertilizers with other kinds of fe...
Claims
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IPC IPC(8): C05D5/00
Inventor 车太龙赵勇王运兴
Owner 营口菱镁化工集团有限公司