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A kind of production method for preparing special fertilizer for flax by-product of tripotassium phosphate

A technology of tripotassium phosphate and its production method, which is applied in the direction of chemical instruments and methods, applications, phosphorus compounds, etc., can solve problems affecting the quality of tripotassium phosphate, waste of element resources, environmental pollution, etc., and achieve significant environmental protection value and economic benefits. The effect of avoiding the discharge of waste liquid and reducing the production cost

Inactive Publication Date: 2016-08-17
GUIZHOU KAILIN GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional flax fertilizer will bring pollution to the environment, causing a large amount of nitrogen, phosphorus and potassium elements to remain in the soil, resulting in a waste of element resources
[0004] At the same time, in the preparation process of tripotassium phosphate products, phosphoric acid obtained by wet-process phosphoric acid or hot-process phosphoric acid is usually prepared by reacting with potassium components, which will bring a large amount of impurities to tripotassium phosphate products and affect the quality of tripotassium phosphate ; Therefore, some researchers reacted urea and phosphoric acid to prepare the urea phosphate intermediate, and then used the intermediate to react with the potassium component to prepare the tripotassium phosphate product. In this process, the product was obtained by crystallization, and the solution often needed to be deeply Only crystallization can meet the requirement that resources are not wasted, the product output is higher and the discharge of waste liquid is reduced; however, in the process of deep crystallization, the purity of the tripotassium phosphate product will still be poor, because in the process there will be With the precipitation of other products, the purity of the tripotassium phosphate product is lower

Method used

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  • A kind of production method for preparing special fertilizer for flax by-product of tripotassium phosphate
  • A kind of production method for preparing special fertilizer for flax by-product of tripotassium phosphate
  • A kind of production method for preparing special fertilizer for flax by-product of tripotassium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A production method for preparing special fertilizer for tripotassium phosphate by-product flax,

[0052] (1) Preparation of intermediate slurry: Put phosphoric acid and carbonamide into a stirred reactor at a molar ratio of 2:1, and control the reaction temperature to 103°C, and stir at a constant stirring speed of 60r / min for 30min. Obtain intermediate slurry;

[0053] (2) Add potassium hydroxide: to step 1) prepare and obtain intermediate slurry and add potassium hydroxide, the concentration of the potassium hydroxide added is 30%, and the addition is 3 times of carbonamide addition, and control temperature of reaction is At 65°C, stir and react at a stirring speed of 50r / min for 50min to obtain tripotassium phosphate slurry;

[0054] (3) Crystallization separation: the tripotassium phosphate slurry obtained in step 2) is cooled and crystallized in a reaction kettle, the temperature during cooling and crystallization is 20°C, and the content of nitrogen, phosphorus ...

Embodiment 2

[0059] A production method for preparing special fertilizer for tripotassium phosphate by-product flax,

[0060] (1) Preparation of intermediate slurry: put phosphoric acid and carbonamide into a stirred reactor at a molar ratio of 1.95:1, and control the reaction temperature at 96°C, and stir at a constant stirring speed of 50r / min for 25min. Obtain intermediate slurry;

[0061] (2) Add potassium hydroxide: to step 1) prepare and obtain intermediate slurry and add potassium hydroxide, the concentration of the potassium hydroxide added is 30%, and the addition is 2 times of carbonamide addition, and control temperature of reaction is At 65°C, stir and react at a stirring speed of 50r / min for 45min to obtain tripotassium phosphate slurry;

[0062] (3) Crystallization separation: the tripotassium phosphate slurry obtained in step 2) is cooled and crystallized in a reaction kettle, the temperature during cooling and crystallization is 20°C, and the content of nitrogen, phosphoru...

Embodiment 3

[0067] A production method for preparing special fertilizer for tripotassium phosphate by-product flax,

[0068] (1) Preparation of intermediate slurry: put phosphoric acid and carbonamide into a stirred reactor at a molar ratio of 2.05:1, and control the reaction temperature to 106°C, and stir at a constant stirring speed of 70r / min for 35min. Obtain intermediate slurry;

[0069] (2) Add potassium hydroxide: to step 1) prepare and obtain intermediate slurry and add potassium hydroxide, the concentration of the potassium hydroxide added is 30%, and the addition is 3 times of carbonamide addition, and control temperature of reaction is At 65°C, stir and react at a stirring speed of 50r / min for 55min to obtain tripotassium phosphate slurry;

[0070](3) Crystallization separation: the tripotassium phosphate slurry obtained in step 2) is cooled and crystallized in a reaction kettle, the temperature during cooling and crystallization is 20°C, and the content of nitrogen, phosphoru...

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Abstract

The invention relates to the technical field of chemical industry, and especially relates to a method for preparing tripotassium phosphate and preparing a special fertilizer for flax as a byproduct. The effective absorption amounts of N, P and K elements are analyzed according to fertilizer requirements of flax, 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 flax 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; and the molar ratio of raw materials in the production process and the accurate analysis and detection of a filtrate in a crystallization step make the quality of the produced flax composite fertilizer guaranteed, and the adjustment of the contents of components of the filtrate allows a waste liquid in the production process of the chemical industry product to be used as a raw material for producing the composite fertilizer, so the emission of the waste liquid is avoided, the production cost of the composite fertilizer is reduced, and the method has substantial environmental protection values 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 special fertilizer for tripotassium phosphate by-product flax. Background technique [0002] Flax (scientific name: Linum usitatissimum L.): It is an annual herb, which can be divided into three types: flax for fiber, flax for oil and flax for both oil and fiber. Stem erect, up to 1.2m high, upper part soft and waxy; leaves alternate, lanceolate, 20-40mm long, 3mm wide, with glaucous surface; flower petals 5, 15-25mm in diameter, Blue or white; the fruit is a capsule, and the seeds are flat and oval. [0003] According to the type of flax, flax can be used for weaving, that is, fiber; it can also be used for oil, that is, oil production; however, for flax cultivation, the traditional technology is to use farmyard manure, nitrogen fertilizer, phosphorus Fertilization treatment than the formulated fertilizer, even when it is used as wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30C05G1/00
Inventor 廖吉星陈肖虎朱飞武高贵龙周勇薛涛蔺忠建
Owner GUIZHOU KAILIN GRP CO LTD
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