A kind of production method of clear liquid type macroelement water-soluble fertilizer

Abstract

The invention discloses a production method of clear liquid type macroelement water-soluble fertilizer.The production method includes: using a potassium hydroxide solution prepared by utilizing a caustic soda unit and carbon dioxide from a urea production unit as intensive raw materials to prepare a potassium carbonate solution; adding ammonium polyphosphate, monopotassium phosphate, ammonium nitrate, urea, medium trace element and plant nutrient regulator, and stirring and heating to boiling for reaction to obtain the clear liquid type macroelement water-soluble fertilizer.In the urea production process, carbon dioxide is adopted as a raw material to produce the potassium carbonate solution, so that raw material utilization rate is increased, massive emission of carbon dioxide is prevented, processes of evaporation and concentration are reduced, and energy consumption is further lowered.Dissolution and reaction are both in a boiling state, so that dissolvability is increased greatly; in the boiling state, certain raw materials like polyphosphate and monopotassium phosphate can be in polymerization to generate high-dissolvability polymer which is free of crystallization even after being cooled, so that the clear liquid type macroelement water-soluble fertilizer produced by the method is ensured to be uniform, clear and good in appearance.

Description

technical field [0001] The invention relates to a production method of a large-element water-soluble fertilizer, in particular to a production method of a clear liquid-type large-element water-soluble fertilizer. Background technique [0002] China uses 9% of the world's arable land and 6% of the fresh water resources to produce 26% of the world's agricultural products. "Water shortage" is more serious than "land shortage". Water and fertilizer integration technology is a combination of soil and fertilizer technology, agronomic technology and water-saving irrigation technology, using water as a carrier, and fertilization is completed at the same time as irrigation. [0003] Water-soluble fertilizers with a large number of elements have two forms: solid (mostly powder) and liquid. At present, more than 95% of the water-soluble fertilizers circulating in the market in my country are in the form of solid (powder). The production process of solid-form water-soluble fertilizers w...

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Problems solved by technology

Among them, patents CN104591930A, CN103641577A, CN101665390A, and CN 104402603A respectively disclose a method for preparing a suspension-type liquid compound fertilizer. Due to the addition of water-insoluble raw materials such as suspending agents and thickeners, it is easy to block the nozzles of facilities during application, and the long-term Storage is prone to stratification and other phenomena; patent CN 104151006A provides a high-concentration macroelement liquid water-soluble fertilizer. The production process uses high-value raw materials such as potassium pyrophosphate and potassium formate. The production cost is relatively high, and potassium formate belongs to strong alkali and weak Salt, in the case of low pH value of liquid fertilizer, long-term storage is prone to hydrolysis, unstable; patent CN102942412B discloses a water-soluble fertilizer with a large number of elements and its preparation method, its composition raw materials are dipotassium hydrogen phosphate, animal hair, feathers etc., this patent is produced by acid hydrolyzing feathers, and the use of acid increases the danger of the production process; CN104446761A discloses a preparation method of a high-phosphorus and high-potassium liquid compound fertilizer, which does not contain nitrogen

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