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A kind of production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer

A technology of dipotassium hydrogen phosphate and a production method, which is applied in the directions of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problem of large tail liquid discharge in production process, large loss of phosphorus and potassium elements, large production cost, etc. It can achieve significant environmental protection value and economic benefits, reduce production costs, and avoid the discharge of waste liquid.

Inactive Publication Date: 2016-03-30
GUIZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many preparation processes for dipotassium hydrogen phosphate, but most of them have low purity of the produced products, and further impurity removal treatment is required, which makes the production cost higher, the tail liquid discharge volume of the production process is large, and the loss of phosphorus and potassium elements is large. and other features

Method used

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  • A kind of production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer
  • A kind of production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer
  • A kind of production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer

Examples

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Effect test

Embodiment 1

[0049] A production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer, comprising the following steps:

[0050] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 1.3:1, raise the temperature to 90°C at a heating rate of 5°C / min, and control the stirring speed of the stirring tank to 180r / min. Mixing reaction 3h, obtain intermediate slurry;

[0051] (2) Preparation of K 2 HPO 4 : Add 2.2mol of alkaline potassium salt into the reaction kettle containing the intermediate slurry prepared in step 1) at a uniform speed for 2h, and control the reaction temperature to be 60°C, stir and react for 20min, and when the detected pH value is 8, the reaction ends , to obtain slurry containing nitrogen, phosphorus and potassium;

[0052] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a cooling crystall...

Embodiment 2

[0060] A production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer, comprising the following steps:

[0061] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 1.9:1, raise the temperature to 140°C at a heating rate of 5°C / min, and control the stirring speed of the stirring tank to 200r / min. Mixed reaction 5h, obtain intermediate slurry;

[0062] (2) Preparation of K 2 HPO 4 : Add 2.6mol of alkaline potassium salt into the reaction kettle containing the intermediate slurry prepared in step 1) at a uniform speed for 3h, and control the reaction temperature to be 80°C, stir and react for 70min, and when the detected pH value is 9.5, the reaction ends , to obtain slurry containing nitrogen, phosphorus and potassium;

[0063] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a cooling crysta...

Embodiment 3

[0071] A production method for preparing dipotassium hydrogen phosphate by-product spinach special fertilizer, comprising the following steps:

[0072] (1) Preparation and mixing of raw materials: put phosphoric acid and carbonamide in a stirred reactor at a molar ratio of 1.5:1, raise the temperature to 100°C at a heating rate of 5°C / min, and control the stirring speed of the stirring tank to 190r / min. Mixed reaction 3.5h, obtain intermediate slurry;

[0073] (2) Preparation of K 2 HPO 4 : Add the basic potassium salt of 2.3mol at a uniform speed for 2.3h into the reaction kettle containing the intermediate slurry prepared in step 1), and control the reaction temperature to be 65°C, stir and react for 40min, and when the detection pH value is 8.5, the reaction End, obtain the slurry containing nitrogen, phosphorus and potassium;

[0074] (3) Cyclic crystallization filtration: place the slurry containing nitrogen, phosphorus, and potassium obtained in step 2) in a cooling c...

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Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing dipotassium hydrogen phosphate and preparing a special fertilizer for spinach as a byproduct. The effective absorption amounts of N, P and K elements are analyzed according to fertilizer requirements of spinach, and the contents of elements in the production process are adjusted and matched to make the prepared compounded composite fertilizer maximally meet the demands of spinach, so the too high cost caused by improper matching of the elements in the production of the composite fertilizer is avoided, and environmental pollution caused by solidification of the composite fertilizer due to the addition of excess elements into soil is further avoided.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production method for preparing special fertilizer for dipotassium hydrogen phosphate by-product spinach. Background technique [0002] Spinach, also known as field vegetable, scientific name: Spinaciaoleracea L., belongs to Amaranthaceae Chenopodiaceae spinach genus, annual herb, ground, smooth and hairless, erect. The whole plant is smooth, tender and moist, without powder. It has a long history of cultivation in China. Its leaves are halberd-shaped or egg-shaped, with sharp tips, slender petioles, strong cold resistance, and are suitable for overwintering cultivation. The leaves of thornless species are oval, hypertrophic, wrinkled, with blunt round apex and short petiole. It has strong heat resistance and high yield. It is suitable for cultivation in spring, summer or late autumn. It also contains rich nutritional elements and has rich nutritional value. Accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00C05B7/00
Inventor 陈肖虎廖吉星高贵龙郑超李军旗王先炜薛涛韩朝应黄芳金会心
Owner GUIZHOU UNIV
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