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A kind of preparation technology of potassium sulfate for water-soluble drip irrigation

A preparation process, a technology of potassium sulfate, applied in the fields of potash fertilizer, application, inorganic fertilizer, etc., can solve the problems such as the lack of comprehensive utilization method of organic extractant, large consumption of fresh water, and strict requirements, and achieve good clarity and high whiteness. , the effect of low production cost

Active Publication Date: 2020-11-06
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements for the raw material and production area of ​​potassium sulfate are relatively strict, and the hot-melt cold crystallization process consumes a lot of fresh water and high energy consumption, and does not provide an effective comprehensive utilization method for the organic extractant used, and there is a certain degree of limitation in the application range. limitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dissolve 100kg of agricultural potassium sulfate in 350kg of sulfuric acid solution with a mass concentration of 30%, stir for 0.5h, and filter to remove water-insoluble precipitates to obtain 440kg of potassium-rich clear liquid;

[0033] (2) In the 440 kg potassium-rich clear liquid obtained in step (1), add 450 kg of 92% ethanol solution with a mass concentration of 1.5 kg / h dropwise, dissolve the crystals, and filter to obtain a homogeneous crude potassium sulfate product and solution. Analyze the mother liquor;

[0034] (3) Wash the crude homogeneous potassium sulfate obtained in step (2) with a KOH solution with a mass concentration of 1% to pH=5, filter, and dry at 80°C for 2 hours to obtain 89.42 kg of water-soluble potassium sulfate for drip irrigation.

[0035] The eluted mother liquor obtained in step (2) is rectified by the rectification process, the rectified alcohol with a mass concentration of 92% is returned to step (2) for recycling, and the acidic rectifi...

Embodiment 2

[0038] (1) Dissolve 100 kg of agricultural potassium sulfate in 380 kg of the acidic rectification mother liquor with a mass concentration of 25% obtained in Example 1, stir for 1 h, and filter to remove water-insoluble precipitates to obtain 475 kg of potassium-rich clear liquid;

[0039] (2) In the 475 kg potassium-rich clear liquid obtained in step (1), add 650 kg of 92% rectified alcohol solution obtained in Example 1 dropwise at a rate of 2.6 kg / h, dissolve the crystallization, and filter to obtain a uniform Crude potassium sulfate and eluted mother liquor;

[0040] (3) Wash the crude homogeneous potassium sulfate obtained in step (2) with a KOH solution with a mass concentration of 5% to pH=6, filter, and dry at 120°C for 1 hour to obtain 87.45 kg of water-soluble potassium sulfate for drip irrigation.

[0041] The eluted mother liquor obtained in step (2) is rectified by the rectification process, the obtained alcohol with a mass concentration of 98% is returned to step (2) fo...

Embodiment 3

[0044] (1) Dissolve 100 kg of agricultural potassium sulfate in 360 kg of sulfuric acid solution with a mass concentration of 28%, stir for 24 hours, and filter to remove water-insoluble precipitates to obtain 450 kg of potassium-rich clear liquid;

[0045] (2) In the 450kg potassium-rich clear liquid obtained in step (1), at a rate of 2.0kg / h, add 450kg of the 98% rectified alcohol solution obtained in Example 2 with a mass concentration of 98%, dissolve the crystallization, and filter to obtain a uniform Crude potassium sulfate and eluted mother liquor;

[0046] (3) Wash the crude homogeneous potassium sulfate obtained in step (2) with a KOH solution with a mass concentration of 10% to pH=8, filter, and dry at 300℃ for 0.5h to obtain 90.36kg of water-soluble potassium sulfate for drip irrigation .

[0047] The eluted mother liquor obtained in step (2) is rectified by the rectification process, the rectified alcohol with a mass concentration of 95% is returned to step (2) for recyc...

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Abstract

The invention discloses a process for preparing water-soluble drip irrigation potassium sulfate. The process includes steps of (1), dissolving agricultural potassium sulfate in inorganic acid solution and stirring and filtering the agricultural potassium sulfate and the inorganic acid solution to obtain potassium-rich clear liquid; (2), dropwise adding organic alcohol solution into the potassium-rich clear liquid, and carrying out solvent-out crystallization and filtering to obtain homogenous potassium sulfate crude products and solvent-out mother liquor; (3), carrying out washing by the aid of KOH solution and carrying out filtering and drying to obtain the water-soluble drip irrigation potassium sulfate. The process has the advantages that the potassium sulfate content of water-soluble drip irrigation potassium sulfate products obtained by the aid of the process is higher than or equal to 99.2%, the water-insoluble matter content of the water-soluble drip irrigation potassium sulfate products is lower than or equal to 0.08%, and the potassium ion yield is higher than or equal to 93%; the water-soluble drip irrigation potassium sulfate is high in whiteness and has small and uniformly distributed particle sizes; dissolution mother liquor is good in clarity, the quality of the dissolution mother liquor is far superior to superior product requirements of national standard GB 20406-2006 on agricultural potassium sulfate, and the problem of drip hole blocking in fertilizer application procedures can be solved; alcohol and inorganic acid mother liquor can be recycled by the aid of the process, and the process includes simple procedures and is low in production cost and suitable for industrial production.

Description

Technical field [0001] The invention relates to a process for preparing potassium sulfate for water-soluble drip irrigation, in particular to a process for preparing high-purity, quick-dissolving potassium sulfate for drip irrigation. Background technique [0002] With the rapid development of water-saving agriculture such as drip irrigation, new water-soluble fertilizers for drip irrigation also show a good market trend. Because of its fast dissolution, simple fertilization, easy absorption by crops, and high nutrient utilization, it is especially suitable for facility agriculture such as sprinkler irrigation and drip irrigation, and has a good effect on the realization of water and fertilizer integration and water saving and efficiency. However, the research on drip irrigation fertilizer in my country started slightly later than that in developed countries, and most of them are based on physical compound fertilizer. There are few researches on single water-soluble drip irrigati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/02
CPCC05D1/02
Inventor 谢超郑贤福高文远冯文平汤建良夏适罗稳杨三妹
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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