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Production method for preparing special fertilizer for dasheen from diammonium hydrogen phosphate by-products

A diammonium hydrogen phosphate and production method technology, applied in the direction of phosphate, phosphorus oxyacid, application, etc., can solve problems such as precipitation, difficulty in meeting quality requirements, and poor product purity, so as to reduce production costs and reduce nitrogen and phosphorus elements Waste rate and effect of waste liquid discharge

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

[0003] At the same time, the preparation process of diammonium hydrogen phosphate products is usually produced by one of hot-process phosphoric acid and wet-process phosphoric acid, but both hot-process phosphoric acid and wet-process phosphoric acid contain a large amount of impurities. The purity of the prepared product is relatively poor, and it is difficult to meet the quality requirements of the industry; for this reason, some researchers have also considered this problem, and replaced the traditional direct production method by using urea phosphate intermediates to improve the diammonium hydrogen phosphate product. purity, but this process often requires deep crystallization of ammonium dihydrogen phosphate to avoid a large amount of nitrogen and phosphorus elements remaining in the filtrate and being removed as waste liquid, causing environmental pollution and reducing costs; however, Deep crystallization will cause the substances of other products to be crystallized out, and then cause the purity of the diammonium hydrogen phosphate product to be low again, which is difficult to meet the quality requirements

Method used

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  • Production method for preparing special fertilizer for dasheen from diammonium hydrogen phosphate by-products
  • Production method for preparing special fertilizer for dasheen from diammonium hydrogen phosphate by-products
  • Production method for preparing special fertilizer for dasheen from diammonium hydrogen phosphate by-products

Examples

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Effect test

Embodiment 1

[0043] A kind of production method of preparing diammonium hydrogen phosphate by-product taro special fertilizer, comprises the following steps:

[0044] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.6:1, at a temperature of 85°C, and control the stirring speed of the stirred tank at 185r / min to stir and mix for 0.5h to obtain an intermediate slurry;

[0045] (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 60°C, adjust the pH value to 7.9, according to the stirring speed of 65r / min , stirred and reacted for 35min to obtain a slurry containing diammonium hydrogen phosphate product;

[0046] (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 10s, cool down ...

Embodiment 2

[0053] A kind of production method of preparing diammonium hydrogen phosphate by-product taro special fertilizer, comprises the following steps:

[0054] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.8:1, at a temperature of 98°C, and control the stirring speed of the stirred tank at 205r / min to stir and mix for 1 hour to obtain an intermediate material pulp;

[0055] (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 70°C, adjust the pH value to 8.1, and set the stirring speed to 75r / min , stirred and reacted for 45min to obtain a slurry containing diammonium hydrogen phosphate product;

[0056] (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 10s, cool d...

Embodiment 3

[0063] A kind of production method of preparing diammonium hydrogen phosphate by-product taro special fertilizer, comprises the following steps:

[0064] (1) Preparation and mixing of raw materials: Put phosphoric acid and urea in a stirred reactor at a molar ratio of 1.7:1, at a temperature of 90°C, and control the stirring speed of the stirred tank at 195r / min to stir and mix for 0.8h to obtain an intermediate slurry;

[0065] (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;

[0066] (3) Cyclic crystallization and filtration: place the slurry containing diammonium hydrogen phosphate obtained in step 2) in a cooling crystallizer and cool it down to a temperature of 33°C within 10s, then cool dow...

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Abstract

The invention relates to the technical field of chemical engineering and particularly relates to a production method for preparing a special fertilizer for dasheen from diammonium hydrogen phosphate by-products. By virtue of analyzing requirements on nutrient elements of the special fertilizer for dasheen and combining the defects existing in a preparation process of diammonium hydrogen phosphate products, the preparation process of diammonium hydrogen phosphate products is combined with a preparation process of the special fertilizer for dasheen so that the two processes are complementary, wastage rates of nitrogen and phosphorus and the discharge amount of waste liquid in the preparation process of the diammonium hydrogen phosphate products are reduced and the production cost of diammonium hydrogen phosphate is reduced; by controlling parameters in process steps, the purity of the diammonium hydrogen phosphate products can reach 96% and meanwhile an efficient special nitrogen-phosphorus-potassium complex salt combined-state compound fertilizer is provided for dasheen.

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 diammonium hydrogen phosphate by-product taro. Background technique [0002] Taro is a perennial tuber plant, often cultivated as an annual crop; taro is rich in nutrients, contains a lot of starch, minerals and vitamins, and can be dried or floured for consumption. The starch granules of taro are small, only one tenth of potato starch First, its digestibility can reach 98.8%, and it has a good edible prospect; at present, when people plant taro, they generally use chemical fertilizers, urea, manure and other raw materials to prepare it, and the effect is good, but the chemical fertilizers and urea contain It is far from enough to meet the nutritional needs of taro, and according to the theory of short boards of wooden barrels, when a certain nutrient is lacking, the absorption of other nutrient elements will al...

Claims

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Application Information

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IPC IPC(8): C01B25/28C05G1/06
Inventor 魏发展陈肖虎廖吉星高贵龙朱飞武薛涛彭宝林赵伟毅曾舒
Owner GUIZHOU KAILIN GRP CO LTD
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