Silicic acid fertilizer and preparation process thereof

Abstract

The invention relates to a silicic acid fertilizer and a preparation process thereof. The silicic acid content of the silicic acid fertilizer is higher than or equal to 10%, and the pH (potential of hydrogen) value of saturated leachate is lower than or equal to 6.5. According to the silicic acid fertilizer, sodium silicate or a material block containing calcium silicate serves as a raw material,the raw material is neutralized by acid to prepare colloidal solution, and the colloidal solution is deposited, filtered, washed, neutralized, dried and crushed to obtain the silicic acid fertilizer.The silicic acid fertilizer has the advantages that the silicic acid fertilizer is high in silicic acid content, moderate in solubility and rapid in effect cannot cake and go bad and has effect for along time after being applied into the field, the utilization rate of silicon dioxide can reach 100%, the silicic acid fertilizer can serve as a base fertilizer and can also serve as an additional fertilizer, the yield of crops can be greatly increased, the silicic acid fertilizer and commonly used fertilizers such as a nitrogen fertilizer, a phosphate fertilizer and a potassium fertilizer can beblended into a compound fertilizer, and the silicic acid fertilizer is more convenient to use, simple in manufacturing method, less in investment and low in production cost.

Description

technical field [0001] The invention belongs to the field of agricultural chemical fertilizers, and in particular relates to a silicic acid fertilizer and a preparation process thereof. Background technique [0002] As we all know, the body of plants contains a certain amount of silica, which is an important component of plant bodies. Plants need to continuously absorb silica from the surrounding environment during their growth. The silica absorbed by plants comes from silicic acid dissolved in soil moisture. Studies have shown that silica dissolved in natural water bodies actually exists in the form of silicic acid. The content of silicon dioxide in the soil is very high, but the silicon dioxide in the soil cannot be dissolved in water directly. The silicon dioxide can only be dissolved in water after hydration reaction with water to form silicic acid. The hydration reaction of silicon oxide is extremely slow, and the released silicic acid is very rare, so that the conten...

AI Technical Summary

Problems solved by technology

The current silicon fertilizers are all made of calcium silicate as an active ingredient, but the hydrolysis reaction of calcium silicate is a reversible reaction with a small equilibrium constant. The amount of silicic acid released by calcium silicate to the surrounding water body is very limited, and silicon Calcium silicate itself has strong hydraulic coagulation, and calcium silicate molecules will form a solid three-dimensional network structure after reacting with water molecules, so calcium silicate will gradually agglomerate and harden in water, losing its original hydrolytic activity. For this reason, the real effective utilization rate of the so-called "effective silicon dioxide" contained in calcium silicate is less than 10% of its actual content, which causes a lot of waste

Moreover, the existing silicon fertilizers with calcium silicate as active ingredients are alkaline and cannot be mixed with nitrogen fertilizers and phosphate fertilizers. Generally, they can only be used alone as base fertilizers.

And take silicic acid as the chemical fertilizer of active ingredient, there is no report yet