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

CN104261378BInactive Publication Date: 2016-08-24GUIZHOU KAILIN GRP CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-08-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

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...