Production method for preparing diammonium hydrogen phosphate and byproduct special fertilizer for oats

A technology of diammonium hydrogen phosphate and production method, applied in the directions of phosphate, phosphorus oxyacid, application, etc., can solve the problems affecting the purity of ammonium dihydrogen phosphate products, poor purity of ammonium dihydrogen phosphate products, and output of ammonium dihydrogen phosphate products low problems, achieve significant environmental protection value and economic benefits, reduce nitrogen and phosphorus elements, and reduce emissions

Inactive Publication Date: 2015-01-14
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, in the preparation process of diammonium hydrogen phosphate products, hot-process phosphoric acid and wet-process phosphoric acid are usually used, but no matter whether hot-process phosphoric acid or wet-process phosphoric acid is used to prepare ammonium dihydrogen phosphate products, there will be a large amount of impurity elements in the process Pure, the purity of the ammonium dihydrogen phosphate product prepared is relatively poor, and the ammonium dihydrogen phosphate product prepared by hot-process phosphoric acid or wet-process phosphoric acid often also needs to be reduced by deep crystallization treatment in the crystallization treatment step. The waste of raw material elements saves raw material resources, reduces the production cost of ammonium dihydrogen phosphate products, and reduces the discharge of waste liquid. However, this process will bring other impurities into ammonium dihydrogen phosphate during deep crystallization, which will affect the production of ammonium dihydrogen phosphate. The purity of the product, without deep crystallization, the output of ammonium dihydrogen phosphate product is low, and a large amount of nitrogen and phosphorus resources will be wasted, resulting in an increase in production costs

Method used

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  • Production method for preparing diammonium hydrogen phosphate and byproduct special fertilizer for oats
  • Production method for preparing diammonium hydrogen phosphate and byproduct special fertilizer for oats
  • Production method for preparing diammonium hydrogen phosphate and byproduct special fertilizer for oats

Examples

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Effect test

Embodiment 1

[0047] A production method for preparing diammonium hydrogen phosphate by-product oat special fertilizer, comprising the following steps:

[0048] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.4:1, at a temperature of 80°C, and control the stirring speed of the stirred tank at 180r / min to stir and mix for 2 hours to obtain an intermediate material pulp;

[0049] (2) Preparation of diammonium hydrogen phosphate: pass ammonia gas into the intermediate slurry obtained in step 1), and control the temperature in the reactor to 50°C, adjust the pH value to 7.8, according to the stirring speed is 60r / min , stirred and reacted for 30min to obtain a slurry containing diammonium hydrogen phosphate product;

[0050] (3) Cyclic crystallization and filtration: place the slurry containing diammonium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 40°C within 15 seconds, ...

Embodiment 2

[0057] A production method for preparing diammonium hydrogen phosphate by-product oat special fertilizer, comprising the following steps:

[0058] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.9:1, at a temperature of 130°C, and control the stirring speed of the stirred tank at 200r / min to stir and mix for 3 hours to obtain an intermediate material pulp;

[0059] (2) Preparation of diammonium hydrogen phosphate: pass ammonia gas into the intermediate slurry obtained in step 1), and control the temperature in the reactor to 80°C, adjust the pH value to 8.2, and set the stirring speed to 80r / min , stirred and reacted for 50min to obtain a slurry containing diammonium hydrogen phosphate product;

[0060] (3) Cyclic crystallization and filtration: place the slurry containing diammonium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 30° C. within 15 seconds, co...

Embodiment 3

[0068] A production method for preparing diammonium hydrogen phosphate by-product oat special fertilizer, comprising the following steps:

[0069] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.65:1, at a temperature of 115°C, and control the stirring speed of the stirred tank at 190r / min to stir and mix for 2.5 hours to obtain an intermediate material pulp;

[0070] (2) Preparation of diammonium hydrogen phosphate: feed ammonia gas into the intermediate slurry obtained in step 1), and control the temperature in the reactor to 65°C, adjust the pH value to 8, and set the stirring speed to 70r / min , stirred and reacted for 40min to obtain a slurry containing diammonium hydrogen phosphate product;

[0071] (3) Cyclic crystallization and filtration: place the slurry containing diammonium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 35°C within 15 seconds, coo...

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Abstract

The invention relates to the technical field of chemical engineering, and particularly relates to a production method for preparing diammonium hydrogen phosphate and a byproduct special fertilizer for oats. The fertilizer requirements of oats are analyzed, and the defects in processing steps in the preparation of an ammonium dihydrogen phosphate product are analyzed, so that the preparation processes of the special fertilizer for oats and the ammonium dihydrogen phosphate product are combined, and the two irrelevant processes are made complementary, thereby increasing the added value in the preparation process of the ammonium dihydrogen phosphate product, improving the purity of the ammonium dihydrogen phosphate product, saving element resources such as nitrogen, phosphorus and the like, and reducing the discharge amount of waste liquor; and nutritive elements in the waste liquor produced in the preparation process of the ammonium dihydrogen phosphate product are controlled and regulated, so that the elements such as nitrogen, phosphorus and the like in the waste liquor can satisfy growth requirements of oats, the purity of the ammonium dihydrogen phosphate product is increased to 93% or above, the residual nitrogen and phosphorus elements in the waste liquor are reduced, and the discharge amount of the waste liquor is reduced. Thus, the production method has remarkable environmental protection value and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing a special fertilizer for oat by-product diammonium hydrogen phosphate. Background technique [0002] Oat is a grass plant, which is called naked oat in China, commonly known as oil wheat, jade wheat, brome, and wild wheat. It is a low-sugar, high-nutrition, high-energy food. Oatmeal is rich in dietary fiber, which can promote gastrointestinal motility, facilitate defecation, low in calories, low glycemic index, lowering lipids and blood sugar, and is also one of the high-end supplements. It is an indispensable dry food in poor areas. According to a comprehensive analysis by the Institute of Health, Chinese Academy of Medical Sciences, Chinese naked oat contains 15.6% crude protein, 8.5% fat, and starch releases heat and elements such as phosphorus, iron, and calcium. The water-soluble dietary fiber in oats is 4.7 times and 7.7 times th...

Claims

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Application Information

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IPC IPC(8): C01B25/28C05G1/06
Inventor 郑超陈肖虎廖吉星高贵龙朱飞武薛涛周勇赵伟毅曾舒赵平原
Owner GUIZHOU KAILIN GRP CO LTD
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