Method for preparing fulvic acid ammonium phosphate fertilizer containing organic titanium through recrystallization process

Abstract

The invention relates to a method for preparing a fulvic acid ammonium phosphate fertilizer containing organic titanium through a recrystallization process. The method is characterized by comprising the following steps of: preparing a newly precipitated metatitanic acid by neutralizing an iced solution of a titanium salt with an alkali; using the newly precipitated metatitanic acid to substitute chlorides and sulfates of titanium for being used as a raw material for synthesizing citric acid titanium without chloride and sulfide ions; taking the newly precipitated metatitanic acid as a titanium source, taking citric acid as an acid solvent and a chelating agent, and synthesizing a saturated solution of the citric acid titanium through a microwave hot-melting chelating process; and mixing diammonium phosphate containing crystal water with fulvic acid ammonium according to the proportion, co-melting at the temperature of not less than 40 DEG C for preparing a compound body of a fulvic acid ammonium salt and an ammonium phosphate salt, keeping the temperature of the compound body of the fulvic acid ammonium salt and the ammonium phosphate salt at the temperature which is not less than 40 DEG C, adding the solution of the citric acid titanium according to the proportion, uniformly mixing, cooling and performing recrystallization. According to the method disclosed by the invention, a humic acid type phosphate fertilizer synergist and the organic titanium capable of strongly promoting the absorption of a phosphorus element and the operation of plants are dissolved into a whole against the problem of low utilization rate of the phosphate fertilizer, and a double-superimposed phosphate fertilizer synergist is formed.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a method for preparing ammonium phosphate fertilizer containing organic titanium by a recrystallization process. Background technique [0002] Phosphorus is an essential nutrient element for plant growth. In agricultural production, phosphorus fertilizer is the second largest type of fertilizer. 74% of the cultivated land in my country is deficient in phosphorus. The application of phosphorus fertilizer has become an essential measure to ensure crop yield increase. [0003] According to the comprehensive scientific and technological level of my country's current agriculture, the utilization rate of fertilization of agricultural crops in my country is only about 30%, while the seasonal utilization rate of phosphorus fertilizer in my country is only 10% to 20%, resulting in a large amount of fertilizer loss and waste and environmental pollution. [0004] How to impr...

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Problems solved by technology

[0029] Above patent document discloses directly the chloride of water-soluble titanium, or the sulfate salt of titanium as the raw material of synthetic organic titanium citric acid chelate compound, the weak point of its existence is that in the organic titanium citric acid chelate synthesized Miscellaneous with a large number of chloride ions or sulfide ions

[0033] There is no report on the compounding of organic titanium and fulvic acid as a synergist for phosphate fertilizer