A kind of method for preparing sodium dihydrogen phosphate co-production special compound fertilizer for Atractylodes

Abstract

The invention discloses a method for preparation of sodium dihydrogen phosphate and coproduction of a special compound fertilizer for bighead atractylodes rhizome. The method comprises three steps as follows: preparation of an intermediate by a reaction, preparation of sodium dihydrogen phosphate and preparation of the special compound fertilizer for bighead atractylodes rhizome. By controlling raw materials, temperature and element content, a filtrate which can be used to prepare the special compound fertilizer for bighead atractylodes rhizome is obtained. By the use of the compound fertilizer prepared from the filtrate, requirements of bighead atractylodes rhizome on nutrient elements can be met, and the soil environmental-pollution problem caused by the fertilizer residue is avoided. The method has high value of environmental protection as well as economic value.

Description

technical field [0001] The invention relates to the technical field of chemical fertilizers, in particular to a method for preparing a special compound fertilizer for sodium dihydrogen phosphate co-production Atractylodes macrocephala. Background technique [0002] Atractylodes atractylodes, aliases: Jiji, Yushu, Dongbaizhu, Xishu, Poplar, Wushu, Pianzhu, Cangzhu, etc., belong to the family Asteraceae and Atractylodes genus, herbaceous perennials, with rhizomes in the shape of nodules. Stems erect, usually branched from middle to lower part, all smooth and glabrous. It likes a cool climate, and its rhizomes are used as medicine, which has many medicinal functions. The growth of Atractylodes macrocephala is inseparable from fertilizers, and after ordinary fertilizers are applied to cultivated land, part of them will be transpired, dissipated and lost with water, part of them will be fixed and utilized by soil and soil microorganisms, and only part of them will be absorbed an...

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Problems solved by technology

[0004] The patent document that publication number is CN101475463A discloses a kind of method that calcium formate and superphosphoric acid react and co-produce high-purity formic acid and sodium dihydrogen phosphate, this method adopts carbon monoxide to enter reaction three towers, potassium hydroxide enters reaction one tower, and comes from The carbon monoxide in the second reaction tower reacts countercurrently, the reaction liquid overflows to the second reaction tower, and reacts countercurrently with the carbon monoxide gas from the third reaction tower. The feed tank is used to prepare a calcium formate preparation solution. The calcium formate preparation solution enters the reactor, drips formic acid, feeds hydrogen sulfide, and separates the filter residue through the filter I. The filtrate enters the continuous crystallizer, and the crystallization solution enters the filter II. The calcium formate is made into finished calcium formate through the dryer, superphosphoric acid, formic acid and calcium formate are input into the horizontal twin-screw reactor to generate formic acid and calcium dihydrogen phosphate, which enter the formic acid distillation tank for vacuum distillation, and the calcium dihydrogen phosphate is transported to Calcium dihydrogen phosphate metering receiving tank, formic acid enters the formic acid receiving tank, although the formic acid prepared by this method has high purity, but due to the complicated preparation process, high equipment requirements, and the unstable sodium dihydrogen phosphate product, the production cost is too high

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