A kind of production method for preparing special fertilizer for potassium dihydrogen phosphate by-product wolfberry

A technology of potassium dihydrogen phosphate and its production method, which is applied in the direction of chemical instruments and methods, applications, and phosphorus compounds, and can solve problems such as environmental pollution, single fertilizer products, and waste of resources, so as to reduce production costs, avoid environmental pollution, and avoid The effect of emissions

Inactive Publication Date: 2016-08-24
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 present, there are many kinds of compound fertilizers and micro-fertilizers on the market, but they are all lacking in pertinence, and they do not have a clear understanding of the nutrition, growth, growth and fertilization of Lycium barbarum, a crop with distinct regional growth and growth cycle. There are not many technical researches, the fertilizer products developed are single, and the nutrition is not comprehensive, which cannot meet the nutritional needs of wolfberry.
For example, the patent No. CN201310353203.4 "A high-efficiency nitrogen fertilizer containing more than 47% nitrogen and its preparation method" is made by compounding urea, melamine, dicyandiamide, melamine formaldehyde resin and thiourea according to a certain ratio. , and then increase the nitrogen content in the fertilizer, improve the quality of the fertilizer, so as to provide a large amount of nitrogen for the crops to meet the needs of the crops; Limited, and its absorption rate is low, the absorption rate for nitrogen element does not exceed 25%, the absorption rate for phosphorus element does not exceed 40%, and the absorption rate for potassium element does not exceed 60%, so for the traditional composite Fertilizers and chemical fertilizers will have a large amount of nitrogen, phosphorus and potassium remaining in the soil, which is difficult to be absorbed by crops, thereby causing environmental pollution and waste of resources; at the same time, some researchers have also studied the use of wolfberry fertilizers, such as the patent No. CN200510065339.0 "Preparation of Special Fertilizer for Lycium Barbarum and Fertilization Technology", this technology has prepared different fertilizer formulas for different growth stages of Lycium barbarum, and the raw materials of the formula are urea, double superphosphate, and potassium sulfate for mixing, pulverizing, and making It is made of granules, and also provides micro-fertilizers, which are compounded by mixing urea, potassium dihydrogen phosphate, potassium chloride, EDTA, borax, magnesium sulfate, ferrous sulfate, ammonium molybdate, other sulfates and trace element salts It can be seen from this that in the prior art, traditional chemical fertilizers are generally used as fertilizers for wolfberry. Although this fertilizer can meet the needs of wolfberry growth nutrients, it needs to be used every year. Fertilization for many times will make the soil absorb the fertilizer more and more thinner, resulting in damage to the structural layer of the soil, which will affect the ecological environment and cause a large amount of nitrogen, phosphorus and potassium to be wasted
[0004] Furthermore, in the preparation process of potassium dihydrogen phosphate products, it is usually prepared by reacting phosphoric acid and potassium element, and some people use phosphoric acid and urea to react to form urea phosphate, and then use urea phosphate to react with potassium element to prepare potassium dihydrogen phosphate , but the preparation of potassium dihydrogen phosphate by the two preparation methods usually requires the use of deep crystallization to reduce the waste of phosphorus and potassium resources, increase the output of potassium dihydrogen phosphate, and reduce production costs; however, accompanied by deep crystallization, it will also lead to other The precipitation of impurities affects the purity of the potassium dihydrogen phosphate product. In order to improve the purity of the potassium dihydrogen phosphate product, a purification process needs to be added, which leads to an increase in the cost of preparing the potassium dihydrogen phosphate product.

Method used

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  • A kind of production method for preparing special fertilizer for potassium dihydrogen phosphate by-product wolfberry
  • A kind of production method for preparing special fertilizer for potassium dihydrogen phosphate by-product wolfberry
  • A kind of production method for preparing special fertilizer for potassium dihydrogen phosphate by-product wolfberry

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Effect test

Embodiment 1

[0047] A production method for preparing potassium dihydrogen phosphate by-product wolfberry special fertilizer, comprising the following steps:

[0048] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 2.3:1, raise the temperature to 110°C at a heating rate of 11°C / min, and control the stirring speed of the stirring tank to 130r / min to stir Mixing reaction 3h, obtain intermediate slurry;

[0049] (2) Preparation of KH 2 PO 4 : Add alkaline potassium salt again and contain step 1) in the reaction kettle of the intermediate slurry that makes, the addition is 3 times of the amount of carboxamide, and employing stirring speed is that 100r / min stirring reaction 55min, obtains phosphoric acid di Slurry of potassium hydrogen;

[0050] (3) Cyclic crystallization and filtration: place the slurry obtained in step 2) in a cooling crystallizer to cool down to a temperature of 15°C, cool down to cyclic crystalliza...

Embodiment 2

[0055] A production method for preparing potassium dihydrogen phosphate by-product wolfberry special fertilizer, comprising the following steps:

[0056] (1) Preparation and mixing of raw materials: put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 2.5:1, raise the temperature to 130°C at a heating rate of 11°C / min, and control the stirring speed of the stirring tank to 110r / min to stir Mixing reaction 3h, obtain intermediate slurry;

[0057] (2) Preparation of KH 2 PO 4 : Add alkaline potassium salt again and contain step 1) in the reaction kettle of the intermediate slurry that makes, the addition is 3 times of the amount of carboxamide, and employing stirring speed is that 100r / min stirring reaction 55min, obtains phosphoric acid di Slurry of potassium hydrogen;

[0058] (3) Cyclic crystallization and filtration: place the slurry obtained in step 2) in a cooling crystallizer to cool down to a temperature of 13°C, cool down to cyclic crystalliza...

Embodiment 3

[0063] A production method for preparing potassium dihydrogen phosphate by-product wolfberry special fertilizer, comprising the following steps:

[0064] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 2.4:1, raise the temperature to 120°C at a heating rate of 11°C / min, and control the stirring speed of the stirring tank to 120r / min to stir Mixing reaction 2h, obtain intermediate slurry;

[0065] (2) Preparation of KH 2 PO 4 : Add alkaline potassium salt again and contain step 1) in the reaction kettle of the intermediate slurry that makes, and add-on is 3 times of the amount of carboxamide, and employing stirring speed is 85r / min stirring reaction 50min, obtains phosphoric acid di Slurry of potassium hydrogen;

[0066] (3) Cyclic crystallization and filtration: place the slurry obtained in step 2) in a cooling crystallizer to cool down to a temperature of 11°C, cool down to cyclic crystallization and...

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Abstract

The invention relates to the field of chemical technology, in particular to a production method for preparing potassium dihydrogen phosphate by-product Lycium barbarum special fertilizer, through the molar ratio of raw materials in the production process, accurate analysis and detection of the filtrate in the crystallization step, so that the produced The quality of the wolfberry compound fertilizer is guaranteed, and by adjusting the content of the filtrate, the waste liquid in the production process of chemical products is used as the raw material for compound fertilizer production, which avoids the discharge of waste liquid and reduces the production cost of compound fertilizer; at the same time, it improves It improves the purity of potassium dihydrogen phosphate products, reduces the production cost of potassium dihydrogen phosphate products, avoids environmental pollution, and has significant economic and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing potassium dihydrogen phosphate by-product wolfberry special fertilizer. Background technique [0002] Lycium barbarum is a special fertilizer-tolerant perennial woody medicinal and edible economic crop with a long annual growth cycle. From April to early November every year, it will experience flower bud differentiation, branch and leaf growth, flowering and fruiting, and root growth. And other important processes, every process needs to consume a lot of nutrients, and it takes a long time to fertilize. If the supply of nutrients is insufficient or the supply of nutrients is not comprehensive, it will affect the growth of branches and the differentiation of flower buds, and it is easy to Causes a large number of flowers and fruits to drop. Insufficient nutrient supply not only affects the output of the year, but also directly affects t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 廖吉星陈肖虎魏发展高贵龙朱飞武薛涛彭宝林
Owner GUIZHOU KAILIN GRP CO LTD
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