Method for preparing controlled release compound fertilizer through magnesium slag phosphorus acid passivation

A technology of slow-release compound fertilizer and magnesium residue phosphoric acid, applied in urea compound fertilizer, phosphate fertilizer, Thomas Phosphate fertilizer, etc., can solve the problems of difficulty in large-scale promotion, limited slow-release effect, and difficulty in degradation, and achieve high-value comprehensive utilization , the effect of reducing fertilizer loss and easy production and application

Inactive Publication Date: 2015-05-20
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slow-release fertilizers currently on the market are mainly packaged. The package materials are divided into two types, namely, inorganic coating materials and organic coating materials.

Method used

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  • Method for preparing controlled release compound fertilizer through magnesium slag phosphorus acid passivation
  • Method for preparing controlled release compound fertilizer through magnesium slag phosphorus acid passivation
  • Method for preparing controlled release compound fertilizer through magnesium slag phosphorus acid passivation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh magnesium slag, urea, and industrial potassium sulfate and use a small grinder to grind them through an 80-mesh sieve for later use, absorb 11.00mL of 85% phosphoric acid and add 10mL of water to dilute for later use. Weigh 20g of magnesium slag powder passed through a 80-mesh sieve and put it into a beaker, pour the diluted phosphoric acid into the beaker, stir quickly with a glass rod to make the magnesium slag and phosphoric acid mix evenly and fully react, and then add urea powder passed through an 80-mesh sieve 41.04g and 27.20g of industrial potassium sulfate powder, fully mixed evenly, and mixed and granulated in a disc granulator. Then it is taken out and dried to obtain the magnesium slag-based slow-release fertilizer. The slow-release performance of the prepared magnesium slag-based slow-release fertilizer was measured by water-soluble method to obtain an initial release rate of potassium of 2.60%, and a cumulative release rate of 65.69% in 28 days, meet...

Embodiment 2

[0022] Weigh a certain amount of magnesium slag, urea, and industrial potassium sulfate and use a small grinder to grind them through an 80-mesh sieve for use, absorb 11.00mL of 85% phosphoric acid and add 15mL of water to dilute for use. Weigh 20g of magnesium slag powder passed through a 80-mesh sieve and put it into a beaker, pour the diluted phosphoric acid into the beaker, stir quickly with a glass rod to mix the magnesium slag and phosphoric acid evenly, and then add 41.04g of urea powder passed through an 80-mesh sieve and 27.20 g of industrial potassium sulfate powder, fully mixed evenly, and after mixing and granulating in a disc granulator, the magnesium slag-based slow-release compound fertilizer was obtained. The slow-release performance of the prepared magnesium slag-based slow-release fertilizer was measured by water-soluble method, and the initial release rate of potassium was 0.78%, and the cumulative release rate in 28 days was 62.06%, which met the requirement...

Embodiment 3

[0024] Weigh a certain amount of magnesium slag, urea, and industrial potassium sulfate and use a small grinder to grind them through an 80-mesh sieve for use, absorb 8.75mL of 85% phosphoric acid and add 10mL of water to dilute for use. Weigh 20g of magnesium slag powder passed through a 80-mesh sieve and put it into a beaker, pour the diluted phosphoric acid into the beaker, stir quickly with a glass rod to mix the magnesium slag and phosphoric acid evenly, and then add 41.04g of urea powder passed through an 80-mesh sieve and 27.20 g of industrial potassium sulfate powder, fully mixed evenly, and granulated in a disc granulator to obtain magnesium slag-based slow-release compound fertilizer. The slow-release performance of the magnesium slag-based slow-release fertilizer was measured by water-soluble method to obtain an initial release rate of potassium of 0.67%, and a cumulative release rate of 70.06% in 28 days, meeting the requirements of the national standard for slow-re...

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Abstract

The invention provides a method for preparing a controlled release compound fertilizer through magnesium slag phosphorus acid passivation, and relates to magnesium slag comprehensive utilization and preparation of a controlled release compound fertilizer. According to the method, magnesium slags, phosphorus acid, urea and potassium sulphate are used as basic materials, magnesium slag phosphorus acid passivation, quantitative dosing, stirring and mixing, prilling, drying and other processing methods are performed, and the controlled release compound fertilizer which can be used for crop growth is prepared. According to the invention, the characteristic that the magnesium slags are enriched in active magnesium oxide and active magnesium oxide and phosphoric acid are easily subjected to passivation reaction to generate magnesium calcium phosphate is fully utilized. The method not only has the advantages that the cost of raw materials is low, the processing process is relatively simple, and scale and industrial production is easy to realize, but also has the comprehensive advantages of no pollution, energy consumption reduction and high-efficient utilization of magnesium slags.

Description

technical field [0001] The invention relates to the field of preparation of slow-release compound fertilizers, in particular to a method for preparing slow-release compound fertilizers by using phosphoric acid passivation of magnesium slag. Background technique [0002] Magnesium slag is a by-product in the process of producing primary magnesium. In my country, 95% of primary magnesium is produced by the Pidgeon method. Every time a magnesium metal enterprise produces 1 ton of crude magnesium, it will produce 6-10 tons of magnesium slag at the same time. With the rapid development of my country's magnesium smelting industry, the discharge of magnesium slag is increasing day by day, and the stockpiling of a large amount of magnesium slag will cause a series of environmental problems. In recent years, the resource utilization of magnesium slag is mainly concentrated in the fields of building materials, coal desulfurization, modifiers, etc., and there are problems such as few ...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B5/00C05C9/00C05D1/02
Inventor 程芳琴廖洪强梁鹏翔范远李咏玲郭彦霞
Owner SHANXI UNIV
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