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Method for preparing urea gypsum fertilizer by ball milling of gypsum

A technology of gypsum and urea, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, application, etc., can solve the problems of difficult to realize large-scale production, harsh equipment requirements, long reaction time, etc., achieve significant production increase effect, small equipment investment, and production condition requirements low effect

Inactive Publication Date: 2010-08-11
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The cooling precipitation method is to add a small amount of gypsum to the supersaturated solution of urea. Although urea gypsum is produced, the yield relative to the consumption of urea is low
The reaction time is long, heating is required, the process is complicated, the investment is large, the energy consumption is large, and the production capacity is low;
[0009] (2) The preparation of urea gypsum by melting method not only has high reaction temperature and high energy consumption, but also has strict requirements on equipment and large investment, making it difficult to realize large-scale production

Method used

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  • Method for preparing urea gypsum fertilizer by ball milling of gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for preparing urea gypsum used as fertilizer by phosphogypsum ball milling comprises the following steps:

[0029] a. Ingredients: Take Ca 2 SO 4 .2H 2 The weight percent content of O is 90.00% phosphogypsum and urea as raw materials; according to Ca 2 SO 4 .2H 2 O and CO(NH 2 ) 2 The stoichiometric ratio of the reaction, the Ca 2 SO 4 .2H 2The consumption of O is excessive 5% (% by weight, the same hereinafter); according to the Ca in phosphogypsum 2 SO 4 .2H 2 The O content is converted into the mass of required phosphogypsum and urea;

[0030] The amount of phosphogypsum in the batching m 磷石膏 (weight, the same below) and the amount of urea m 尿素 The ratio of is calculated by formula (1) and can be known as:

[0031] m 磷石膏 / m 尿素 =0.84

[0032] b. Ball milling reaction: put phosphogypsum and urea into the ball mill, and put in the balls according to the ball-to-material ratio (weight ratio) of 3. At normal temperature, after the ball milling r...

Embodiment 2～7

[0034] A method for preparing urea gypsum used as fertilizer by phosphogypsum ball milling, the steps are the same as in Example 1, the amount of phosphogypsum in the batching m 磷石膏 (weight, the same below) and the amount of urea m 尿素 The weight ratio is the material mix ratio, and other relevant parameters are shown in the following table:

[0035] Example

[0036] Example

[0037] Note: The phosphogypsum used in each embodiment in the table is produced in western Sichuan and contains Ca 2 SO 4 .2H 2 The weight percent content of O is 90.00%.

Embodiment 8

[0039] A method for preparing urea gypsum used as fertilizer by ball milling of desulfurized gypsum comprises the following steps:

[0040] a. Ingredients: Take Ca 2 SO 4 .2H 2 The weight percentage of O is 92.00% desulfurized gypsum and urea as raw materials; according to Ca 2 SO 4 .2H 2 O and CO(NH 2 ) 2 The stoichiometric ratio of the reaction, the Ca 2 SO 4 .2H 2 The consumption of O is excessive 10% (% by weight, the same hereinafter); 2 SO 4 .2H 2 The O content is converted into the mass of required desulfurization gypsum and urea;

[0041] The amount of desulfurization gypsum in the batching m 脱硫石膏 (weight, the same below) and the amount of urea m 尿素 The ratio of is calculated by formula (1) and can be known as:

[0042] m 脱硫石膏 / m 尿素 =0.86

[0043] b. Ball milling reaction: Put desulfurized gypsum and urea into the ball mill, and put in balls according to the ball-to-material ratio (weight ratio) of 3. At room temperature, after ball milling for 20 min...

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Abstract

The invention discloses a method for preparing a urea gypsum fertilizer by ball milling of gypsum, which is characterized by comprising the following steps: preparing urea gypsum from hypsum and urea, and exceeding 1 to 2 weight percent of the use amount of Ca2SO4.2H2O in a stoichiometric ratio of the Ca2SO4.2H2O to CO(NH4)2 in reaction; converting the Ca2SO4.2H2O content in the gypsum into required use amount of gypsum and urea; and putting the raw materials into a ball mill, performing ball milling in a ratio of grinding media to material of 3-5, and performing ball milling reaction at normal temperature for 20 to 40 minutes to prepare the urea gypsum fertilizer. The method has the advantages of quick reaction at normal temperature, low energy consumption, high efficiency, continuous production and strong practicability; and the solubility of the prepared urea gypsum is about 3.5 percent of that of urea, the dissolution rate and nutrient release rate are much lower than those of the urea, and the urea gypsum has good slow release effect and is a high-efficiency high-quality slow release nitrogen fertilizer.

Description

technical field [0001] The invention relates to a fertilizer, in particular to a method for preparing urea gypsum used as a fertilizer by gypsum ball milling. It belongs to the field of comprehensive utilization of new resources and energy-saving technologies and products in new energy and high-efficiency energy-saving technologies. The product urea gypsum is mainly used as agricultural nitrogen fertilizer, which has good slow-release effect, can be used as slow-release fertilizer, and can also be used as raw material for preparing controlled-release fertilizer, which can effectively improve fertilizer utilization rate, increase grain production, and reduce nitrogen emissions , to reduce its eutrophication pollution to water. Background technique [0002] Urea is the nitrogen fertilizer variety with the largest production, sales and application in the world. However, due to improper fertilization methods in many areas, as well as the leaching, volatilization, infiltration a...

Claims

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Application Information

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IPC IPC(8): C05C9/00
CPCY02P60/21
Inventor 邓跃全董发勤许春凤解忠雷何江洪付鹏
Owner SOUTHWEAT UNIV OF SCI & TECH
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