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Agricultural magnesium sulphate fertilizer and preparation thereof

A technology of magnesium sulfate and sulfuric acid, applied in the fields of magnesium fertilizer, application, agriculture, etc., can solve the problems of low operation continuity and mechanization, extensive production process, incomplete reaction, etc., and achieve advanced and reasonable control, easy reaction, The effect of high production efficiency

Active Publication Date: 2009-07-22
德钾盐亚太私人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process is extensive, the reaction is incomplete, and the efficiency is low; a large amount of acid mist generated during the reaction process is directly emitted into the air, causing serious air pollution and waste of raw materials; in addition, the continuity and degree of mechanization of operations are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of agricultural magnesium sulfate fertilizer of the present invention comprises the steps:

[0023] (1) Add magnesia ore powder and water continuously and evenly according to the weight ratio of 1:1 to 0.42 from the feed port to the pulper for mechanical stirring to prepare a uniform magnesia slurry. The solid-liquid weight percentage concentration of the magnesia slurry is controlled between about 50% and 70%. Here, the pulper adopts a cuboid vertical multi-axis multi-blade pulping tank, and the rotation speed of the paddle shaft is 50 to 120 rpm; the material pulping time is controlled within 30 minutes. If the time is too long, the chemical reaction of the pulp will occur. Magnesium hydroxide, magnesium carbonate, etc. are not conducive to the next step of acid reaction, and will heat and solidify and affect the fluidity of the pulp. The content of magnesium oxide in the magnesium oxide ore powder must be greater than 65%, and if it is too low...

Embodiment 1

[0029] Embodiment one, produce 100 tons of magnesium sulfate fertilizers

[0030] 1. Take 36 tons of magnesia ore powder with a magnesia content of 85% (mass percentage), take 25 tons of water, add them to the slurry tank continuously and evenly in proportion, and stir until uniform after about 3 minutes.

[0031] 2. The adjusted powdery magnesium oxide slurry is continuously sent into the mixing reactor, and at the same time, 65 tons of sulfuric acid with a concentration of 92.5% (mass percentage) are evenly added in proportion to the mixing reactor for reaction. At the outlet of the mixing reactor, the temperature at the outlet of the mixed reaction slurry is controlled at about 140°C.

[0032] 3. The mixed reaction slurry after the reaction is continuously sent into the conversion chamber and stays for aging and solidification. After staying in the conversion chamber for 40 minutes, after shaping and cooling, the powdery magnesium sulfate fertilizer of MgSO4.nH20 form (inne...

Embodiment 2

[0033] Embodiment two, produce 100 tons of magnesium sulfate fertilizers

[0034] 1. Take 38 tons of magnesia ore powder with a magnesia content of 70% (mass percentage), take 34 tons of water, add them to the slurry tank continuously and evenly in proportion, and stir until uniform after about 6 minutes.

[0035] 2. The adjusted powdery magnesium oxide slurry is continuously sent into the mixing reactor, and at the same time, 60 tons of sulfuric acid with a concentration of 98% (mass percentage) is evenly added in proportion to the mixing reactor for reaction. At the outlet of the mixing reactor, the temperature at the outlet of the mixed reaction slurry is controlled at about 150°C.

[0036] 3. The mixed reaction slurry after the reaction is continuously sent into the conversion chamber and stays for aging and solidification. After staying in the conversion chamber for 50 minutes, after shaping and cooling, the powdery magnesium sulfate fertilizer of MgSO4.nH20 form (inner ...

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Abstract

The invention discloses an agricultural magnesium sulfate fertilizer and a preparation method thereof; wherein, the preparation method thereof comprises the following steps: (1) magnesia ore powder and water are fully stirred in a slurry mixer and prepared into magnesia slurry; (2) the mixed magnesia slurry is fed into a mixed reactor to be mixed and reacted with the vitriol continuously added into the mixed reactor; the adding amount of vitriol is adjusted to lead the reaction temperature of the mixed slurry at the outlet of the mixed reactor to be controlled between 121 DEG C and 155 DEG C; (3) the reacted mixed slurry is fed into a returning formation chamber for further reaction and curing, and the water in the materials is baked and vaporized by the self reaction heat of the mixed slurry to dry and solidify the materials; and (4) the cured mixed materials are shaped and packaged, thus becoming the finished product of the agricultural magnesium sulfate fertilizer. The preparation method of the agricultural magnesium sulfate fertilizer has the advantages of high production efficiency, high degree of mechanization, no waste water and solid waste discharge, and small pollution.

Description

technical field [0001] The invention relates to an agricultural fertilizer and a preparation method thereof, in particular to an agricultural magnesium sulfate fertilizer produced by slurrying powdery magnesium oxide by a wet method and a preparation method thereof. Background technique [0002] In the prior art, with the development of agricultural fertilization technology, magnesium sulfate has been widely used as a necessary medium and trace element fertilizer for crops. At present, there are many kinds of magnesium sulfate fertilizers on the market, including industrial magnesium sulfate (HG / F2680-95), magnesium sulfate by-product of seawater or salt lake salt production, and extensive sulfuric acid chemically synthesized by adding powdered magnesium oxide and sulfuric acid. Magnesium fertilizer. At present, the production process of this fertilizer mostly uses simple equipment to simply mix and react sulfuric acid and powdered magnesium oxide, then ripen and pulverize ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D5/00
Inventor 唐春森陈玉国
Owner 德钾盐亚太私人有限公司
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