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Silicate fertilizer and its preparing method

A technology of silicic acid and chemical fertilizer, applied in the field of silicic acid chemical fertilizer and its preparation, can solve the problems of inability to use phosphate fertilizers in combination, less effective utilization rate, agglomeration and hardening of calcium silicate, etc., achieving small investment, low production cost, The effect of moderate solubility

Inactive Publication Date: 2007-06-27
张至德
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Example 1. Use sodium silicate to prepare silicic acid fertilizer (heating gel precipitation method).

[0028] a, take solid sodium silicate (Na 2 SiO 3 ·9H 2 O) as the raw material, get A product;

[0029] b. Make product A into a sodium silicate solution with a concentration of 25%, and add hydrochloric acid to neutralize it so that the pH of the sodium silicate solution does not exceed 6.5, and the resulting silicate colloidal solution is used as product B; the chemical reaction formula is : Na 2 SiO 3 +2HCl→2NaCl+H 2 SiO 3 ;

[0030] c. Use the heating gel precipitation method to transfer product B into the precipitation tank, heat to 80-100°C, and keep the temperature for 3 hours, wait until the silicic acid in product B is completely precipitated, and the obtained product is regarded as product C;

[0031] d. Send product C to a vacuum filter for filtration, wash the precipitate with clean water to remove soluble salt impurities, and then continue to wash the precipita...

Embodiment 2

[0033] Example 2. Use sodium silicate to prepare silicic acid fertilizer (animal glue coagulation precipitation method).

[0034] a. Take solid sodium silicate as raw material to obtain product A;

[0035] b. Make product A into a sodium silicate solution with a concentration of 25%, and add sulfuric acid to neutralize it so that the pH of the sodium silicate solution does not exceed 6.5, and the resulting silicate colloidal solution is used as product B; the chemical reaction formula is :

[0036] Na 2 SiO 3 +H 2 SO 4 →Na 2 SO 4 +H 2 SiO 3 ;

[0037] c. Using animal glue coagulation precipitation method, add sulfuric acid to product B to make the acidity of the silicic acid colloidal solution reach 0-1 mol / liter, and then add the animal glue solution with a concentration of 2% and 10% of the volume of the silicic acid colloidal solution. Heat to 60-80℃ and keep the temperature for 1 hour. After the silicic acid in product B is completely precipitated, the product obtained is prod...

Embodiment 3

[0040] Example 3. Prepare silicic acid fertilizer (sulphuric acid neutralization method) with blocks containing calcium silicate.

[0041] a. Take iron smelting slag (it can also be yellow phosphorus slag or ferromanganese slag, or it can be a block made of limestone and clay) as a raw material to obtain product A;

[0042] b. After crushing product A, put it into the reaction vessel, add water 10 times the weight of product A, add sulfuric acid while stirring, stop adding acid and filter, and the filter residue obtained is rich in silicon Acidic calcium sulfate precipitation, as B residue, the filtrate obtained is a colloidal solution of silicic acid, called B liquid; the chemical reaction formula is,

[0043] CaSiO 3 +H 2 SO 4 +2H 2 O→CaSO 4 ·2H 2 O↓+H 2 SiO 3 ;

[0044] c. Using animal glue coagulation precipitation method, add sulfuric acid to B solution to make the acidity of B solution reach 1 mol / L, then add the animal glue solution with a concentration of 1% and the volume...

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Abstract

The present invention discloses silicate fertilizer and its preparation process. The silicate fertilizer has silicate content not less than 10 % and its saturated leached liquid has pH value not greater than 6.5. It is prepared with sodium silicate or calcium silicate material, and through neutralizing with acid to prepare silicic acid colloid solution, precipitating, filtering, washing, neutralizing, drying and crushing. The silicate fertilizer has the features of high silicate content, fast and long acting, silica utilizing rate up to 100 %, moderate solubility, capacity of greatly raising the yield of crop, etc.

Description

Technical field [0001] The present invention relates to a chemical fertilizer and a preparation method thereof, specifically a silicate chemical fertilizer and a preparation method thereof. Background technique [0002] As we all know, plants contain a certain amount of silica, which is an important component of plant organisms. 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. Research shows that silica dissolved in natural water actually exists in the form of silicic acid. The content of silica in the soil is very high, but the silica in the soil cannot be directly dissolved in water. The silica must first hydrate with water to form silicic acid before it can be dissolved in water. However, under natural conditions The hydration reaction of silica is extremely slow, and the silicic acid released is so rare that the silica content in soil water o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05D9/00
Inventor 张至德
Owner 张至德
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