Near-neutral high-content boron fertilizer and preparation method thereof

Abstract

The invention discloses a near-neutral high-content boron fertilizer and a preparation method thereof. The boron fertilizer is prepared from the following raw materials in a mass ratio: 60 to 75 of boric acid and 25 to 40 of borax. The method for preparing the high-content boron fertilizer comprises the following steps: (1) fully mixing the boric acid and the borax; (2) heating and dehydrating the mixture at the temperature of between 400 and 450 DEG C to obtain a mixture of boric anhydride and anhydrous borax; (3) cooling the mixture of the boric anhydride and anhydrous borax under drying condition; and (4) after cooling the mixture of the boric anhydride and anhydrous borax to below 60 DEG C, crushing and sieving the mixture to obtain the near-neutral high-content boron fertilizer. The near-neutral high-content boron fertilizer has the characteristics of high content of pure boron, low consumption and high solubility. The method for preparing the high-content boron fertilizer has the advantages of simple and convenient operation and energy conservation.

Description

technical field [0001] The invention belongs to boron fertilizer and a preparation method thereof, in particular to a boron fertilizer with high-purity boron content and a preparation method thereof. Background technique [0002] The boron fertilizer with pure boron content > 20% (according to the mass percentage, the same below) is called high-content boron fertilizer. The existing high-content boron fertilizers at home and abroad are divided into two categories, one is borax decahydrate as raw material, pure boron fertilizer The strong alkaline high-content boron fertilizer with a content of 21%; the other type is a weak acid high-content boron fertilizer with boric acid as raw material and a pure boron content of 23% to 23.5%. The former has been unable to further increase the pure boron content of boron fertilizer because the theoretical pure boron content is only 21.48%; the latter can obtain a theoretically pure boron content of 31.05% when the dehydration temperatu...

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Problems solved by technology

The former has been unable to further increase the pure boron content of boron fertilizer because the theoretical pure boron content is only 21.48%; the latter can obtain a theoretically pure boron content of 31.05% when the dehydration temperature of boric acid exceeds 200°C or even higher. Boric anhydride, but because the physical properties of boric anhydride are glass blocks, it cannot be made into boron fertilizer at all, that is, boric anhydride with high-purity boron content cannot be used as boron fertilizer