Method for preparing organic titanium-chitosoligosaccharide ammonium salt biological fertilizer by salting-out process

Abstract

The invention relates to a method for preparing organic titanium-chitosan oligosaccharide ammonium salt biological fertilizer by a salting-out process. The method is characterized in that: new metatitanic acid precipitate is prepared by neutralizing an iced solution of titanium salt by using alkali; the new metatitanic acid precipitate instead of titanium chloride and sulfate is used as raw materials for synthesizing citricacide-titatnium chelate; the citricacide-titatnium chelate is synthesized by a microwave hot melting chelation process by using the new metatitanic acid precipitate as a titanium source and citric acid as an acid solvent and chelant; and the organic titanium-chitosan oligosaccharide ammonium salt biological fertilizer is prepared by neutralizing a saturated solution of citricacide-titatnium chelate by using alkaline chitosan oligosaccharide ammonium salt and salting out. The synthesized organic titanium does not contain chlorine and sulfur ions completely. The citric acid used as the acid solvent and chelant for synthesizing the organic titanium is high in acidity, neutralizing performance and activity, and capacity of chelating metal ions, and stable in performance; and organic ammonium acid generated by reacting the citric acid, ammonium carbonate and ammonium hydroxide is high in content and activity. The organic titanium-chitosan oligosaccharide ammonium salt biological fertilizer is powder, high in stability and convenient to store and convey.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a method for manufacturing biological fertilizers composed of organic titanium-chitooligosaccharide ammonium salts. Background technique [0002] Fertilizer is a strategic material to ensure national food security, and the material basis for maintaining and improving soil fertility to achieve sustainable agricultural development. [0003] Chemical fertilizers are still an important means of production in agricultural production at present, and the absorption and utilization rate of chemical fertilizers in the soil by plants is very low. According to the measurement of my country's current comprehensive agricultural science and technology level, the utilization rate of agricultural crop fertilization in my country is only about 30%, causing a large number of Fertilizer loss and waste and environmental pollution. [0004] The research and development of new fertiliz...

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Problems solved by technology

[0017] 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

[0036] There is no report on the combination of organic titanium and chitosan oligosaccharide compound salt; no report on the use of alkaline (pH ≥ 8) chitosan oligosaccharide compound ammonium salt as a salt-out neutralizer to prepare organic titanium- Report on bio-fertilizer of chitosan oligosaccharide ammonium salt