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Method for preparing foliage silicon fertilizer and using method thereof

A silicon fertilizer and foliar technology, which is applied in the field of preparation of foliar silicon fertilizer, can solve problems such as the difficulty of separating heavy metal ions, and achieve the effects of inhibiting heavy metal absorption, heavy metal pollution, and low production cost.

Active Publication Date: 2010-10-06
IRONMAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in silica sol, since heavy metals themselves are prone to form precipitation under alkaline conditions, it is difficult to separate heavy metal ions.
There is currently no good way to purify silica sols containing heavy metals

Method used

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  • Method for preparing foliage silicon fertilizer and using method thereof
  • Method for preparing foliage silicon fertilizer and using method thereof
  • Method for preparing foliage silicon fertilizer and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of high-concentration and high-purity alkaline silica sol:

[0049] Add metasilicate to 2M NaOH to form a suspension with a mass fraction of 10%, and heat it at 100 degrees for 10 hours to obtain Na 2 SiO 3 For the solution, first use a cation exchange resin, directly filter the solution through a multi-stage resin exchange column, and at the same time add a small amount of 5% hydrochloric acid solution for acidification to obtain an active silicic acid solution with a pH value between 2 and 4. Prepare a 5% NaOH solution, add it dropwise to the active silicic acid solution under vigorous stirring until the pH reaches 9-10, stop the dropwise addition, then heat it to 60°C in a water bath under constant stirring, and maintain it for 24 hours , a stable and transparent high-concentration alkaline silica sol can be obtained. For some heavy metals remaining in the alkaline silica sol, add a chelating agent, such as EDTA, which is 30% more than the total amount ...

Embodiment 2

[0051] Preparation of high-concentration and high-purity alkaline silica sol:

[0052] Add metasilicate to 3M KOH to form a suspension with a mass fraction of 12%, and heat it at 100 degrees for 10 hours to obtain Na 2 SiO 3 For the solution, first use a cation exchange resin, directly filter the solution through a multi-stage resin exchange column, and at the same time add a small amount of 6% nitric acid solution for acidification to obtain an active silicic acid solution with a pH value between 2 and 4. Prepare a KOH solution with a mass fraction of 6%, and add it dropwise to the active silicic acid solution under vigorous stirring until the pH reaches between 9 and 10, stop the dropwise addition, and then heat it to 80°C in a water bath under constant stirring, and maintain After 20 hours, a stable and transparent high-concentration alkaline silica sol can be obtained. The alkaline silica sol is subjected to ion exchange treatment with a cation exchange resin, and then a...

Embodiment 3

[0054] The impurity ion content test of this patented silica sol and commercially available silica sol:

[0055] Test object: the high-concentration and high-purity alkaline silica sol prepared in Example 1; the commercially available silica sol is purchased from Guangzhou Chemical Industry City, the concentration is about 25%, and the pH is between 9 and 10.

[0056] Detection method: Tested by the Analysis and Test Center of the Guangdong Provincial Institute of Ecological Environment and Soil Research and issued an analysis and test report. Among them, the ICP-AES method is used to test the content of six heavy metals including copper, zinc, lead, cadmium, chromium and nickel; the atomic fluorescence method is used to test the content of mercury and arsenic; the flame photometry is used to test the content of sodium; the aluminum reagent colorimetric method is used Test for aluminum content.

[0057] The result shows: as shown in table 1, eight kinds of heavy metal content...

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Abstract

The invention belongs to the field of environmental protection, and discloses a method for preparing foliage silicon fertilizer, namely a method for preparing high-concentration and high-purity nano silicon dioxide sol by using metasilicic acid as a raw material. The h-concentration and high-purity nano silicon dioxide sol is obtained by removing heavy metal and sodium ions harmful to crops from alkali and acid coarse silicon sol prepared from active silicon solution through a heavy metal chelating technique and a dialysis process. The heavy metal content of the silicon dioxide sol prepared by the method is greatly reduced, and the silicon dioxide sol has small salt-containing amount and remarkable inhibiting effect on heavy metal pollution to vegetables and rice; and the method has the advantages of convenient preparation process, low production cost, shorter production period, excellent product performance, small grain diameter, strong stability and easy storage and application.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a preparation method of foliar silicon fertilizer. Background technique [0002] Silica sol has attracted attention as soon as it was discovered. As a new material, nano-silica has been widely used in aerospace technology, electronics, metallurgy, chemistry, biology and medicine. The use of environmental materials and bio-nanomaterials to improve crop disease resistance, stress resistance and pest control is forming a unique research field; and try to directly apply it to agricultural environmental protection and plant protection. In recent years, studies have shown that silicon can improve the resistance of plants to heavy metal poisoning, and it is easy to use and cheap, which has attracted people's attention. Silicon application can significantly alleviate the heavy metal toxicity of rice, and the application of silicon-rich blast furnace slag on cadmium-contaminated soil...

Claims

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Application Information

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IPC IPC(8): C05G3/00A01C21/00
Inventor 李晴刘同旭刘传平李芳柏
Owner IRONMAN ENVIRONMENTAL TECH CO LTD
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