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Method for producing macroelement water-soluble fertilizer by using industrial grade monoammonium phosphate mother liquor

A technology of monoammonium phosphate and macroelements, applied in fertilizer mixture, application, agriculture, etc., can solve the problems of waste of artificial resources and energy, increase of production cost, farmers can't afford it, etc., achieve cascade utilization, reduce steam consumption, The effect of reducing production costs

Active Publication Date: 2015-11-11
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in the production of water-soluble fertilizers by this method: one is that the price of water-soluble fertilizers is high due to the high cost of raw materials, and farmers cannot afford it, which greatly limits the promotion and application of water-soluble fertilizers; the other is that the water-soluble fertilizers produced by this method are easily Deliquescence, agglomeration, flatulence, excessive impurities, etc.
There are generally two ways to deal with the mother liquor: one is to return the system to mix with phosphoric acid after desulfurization, or return to the system to mix with phosphoric acid and then desulfurize, but additional desulfurizers such as barium carbonate and phosphate rock slurry need to be introduced, which increases the production cost. Moreover, when phosphate rock slurry is used, too much calcium ions will be introduced, and calcium hydrogen phosphate will be produced during the ammonification process, resulting in excessive water-insoluble substances in the product
The second is to directly send the mother liquor to the phosphate fertilizer plant for the production of agricultural monoammonium phosphate. Since there are very few impurities in the refined mother liquor, sending it to produce agricultural monoammonium phosphate will undoubtedly cause a waste of manpower, resources and energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take 1071.4kg of industrial-grade monoammonium phosphate mother liquor with a water content of 65%, and then add 214.3kg of urea solution with a water content of 30%, 380.0kg of potassium nitrate, 3.0kg of copper sulfate pentahydrate, 10.0kg of ferrous sulfate heptahydrate, and three Manganese sulfate water 7.0kg, zinc sulfate heptahydrate 3.0kg, ammonium molybdate tetrahydrate 1.0kg, magnesium sulfate heptahydrate 20.0kg, EDTA 52.0kg, then pass through ammonia gas or add ammonia water to adjust the pH value of the solution to 4.5~5.0 For reaction, control the reaction temperature to 70-90°C, stir at the same time, and filter while hot after reacting for 30 minutes;

[0034] 2) The filtrate obtained in step 1) is concentrated until the water content is 25% and then spray-dried to obtain 1000.0 kg of macroelement water-soluble fertilizer, which contains 17.0% N and 20.0% P 2 o 5 , 17.0%K 2 O, 0.075% Cu, 0.2% Fe, 0.2% Mn, 0.07% Zn, 0.05% Mo.

Embodiment 2

[0036]1) Take 1400kg of industrial-grade monoammonium phosphate mother liquor with a water content of 60%, and then add 177.8kg of ammonium nitrate solution with a water content of 10%, 185.0kg of potassium sulfate, 3.0kg of copper sulfate pentahydrate, 10.0kg of ferrous sulfate heptahydrate, and three Manganese sulfate water 7.0kg, zinc sulfate heptahydrate 3.0kg, ammonium molybdate tetrahydrate 1.0kg, magnesium sulfate heptahydrate 20.0kg, EDTA 52.0kg, then pass through ammonia gas or add ammonia water to adjust the pH value of the solution to 4.5-5.0 For reaction, control the reaction temperature at 70-90°C while stirring, and filter while hot after reacting for 60 minutes;

[0037] 2) The filtrate obtained in step 1) is concentrated, and when the water content is 25%, it is spray-dried to obtain 1000.0kg of macroelement water-soluble fertilizer, which contains 13.2%N, 30.0%P 2 o 5 , 9.3%K 2 O, 0.075% Cu, 0.2% Fe, 0.2% Mn, 0.07% Zn, 0.05% Mo.

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PUM

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Abstract

A method for producing macroelement water-soluble fertilizer by using industrial grade monoammonium phosphate mother liquor comprises: adding a urea solution or an ammonium nitrate solution, a potassium fertilizer, trace elements and a chelating agent into the industrial grade monoammonium phosphate mother liquor; and chelating, filtering, concentrating and drying the mixture to obtain the macroelement water-soluble fertilizer . The method provided by the invention is free of three-waste discharge in the whole course, so that gradient utilization and comprehensive utilization of resources are realized, the production cost is lowered, the economical benefit is improved, and moreover, compared to a fertilizer produced by a physical mixing method, the macroelement water-soluble fertilizer is high in purity, good in appearance and low in cost, and market popularization and agricultural application are favorably facilitated.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a method for producing water-soluble fertilizers with a large number of elements by utilizing industrial-grade monoammonium phosphate mother liquor. Background technique [0002] Water-soluble fertilizers refer to multi-component compound fertilizers that can be completely dissolved in water. After being dissolved or diluted in water, they can be used as solid or liquid fertilizers for irrigation and fertigation, foliar fertilization, etc. Since water-soluble fertilizers can be completely dissolved in water, they are more easily absorbed by crops. Instant dissolution, no residue, high absorption rate, quick effect, and convenient application are the significant advantages of water-soluble fertilizers. Moreover, they can be used in facility agriculture such as spraying and drip irrigation. Realize the integration of water and fertilizer. The "Water and Fertilize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 李万清魏天荣刘建宏何光伟蒋鑫华
Owner HUBEI SANNING CHEM