Porous slow-release selenium fertilizer and preparation method thereof

A slow-release, selenium fertilizer technology, used in glass manufacturing equipment, alkaline orthophosphate fertilizers, phosphate fertilizers, etc., can solve the damage of soil physicochemical properties, soil microbial system, unfavorable ecological sustainable development, and ineffective selenium fertilizers and other problems, to achieve the effect of maintaining the degree of looseness, which is conducive to ecological sustainable development, and the process of transportation and transformation is long.

Pending Publication Date: 2020-01-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The ways of applying selenium fertilizer mainly include soil fertilization, foliar spraying, and selenium liquid seed dressing. Labor costs are reduced, and sodium selenite is toxic to a certain extent, causing potential harm to construction workers
At the same time, the volatilization temperature of selenium-containing minerals is about 700°C, and related studies have pointed out that at 800°C, the selenium in stone coal is almost completely volatilized, and the volatilization rate reaches 98.6%. When the temperature reaches 900°C, the selenium in stone coal has completely evaporated. Volatilization, the volatilization rate reaches 100%, it can be seen that the selenium in the fertilizer is very easy to volatilize completely, resulting in the selenium fertilizer applied not having the desired effect
In addition, the long-term use of the above-mentioned selenium fertilizers will cause serious damage to the physical and chemical properties of the soil and the soil microbial system, resulting in soil compaction and a decline in fertility year by year, which is not conducive to the sustainable development of ecology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: put 10% fly ash, 40% phosphate slag, 10% glass, 10% perlite, 10% pumice powder, 15% volcanic ash, and 5% potassium nitrate into a ball mill according to the mass fraction, and after ball milling for 20 hours , pass the ball milled powder through a 100-150 mesh standard sieve, and the sieve residue is less than 2%, to obtain the batch material; the grinding medium in the ball mill is a zirconia ball, and the diameter of the grinding medium is less than 5mm. When charging, control the quality of the grinding medium and the added material The ratio is 2:1; the potassium nitrate used is industrial grade raw material;

[0028] Step 2: Put the batch material into a heat-resistant stainless steel mold, move the mold together with the batch material into the foaming kiln; start from room temperature, raise the temperature to 680 °C at a heating rate of 4 °C / min and keep it warm for 30 min; The heating rate of ℃ / min is raised to 850 ℃ for 45 minutes; then, the temperatur...

Embodiment 2

[0033] Step 1: put 20% fly ash, 10% phosphate slag, 20% glass, 20% perlite, 10% pumice powder, 19% volcanic ash, and 1% potassium nitrate into a ball mill according to the mass fraction, and after ball milling for 36 hours , pass the ball milled powder through a 100-150 mesh standard sieve, and the sieve residue is less than 2%, to obtain the batch material; the grinding medium in the ball mill is a zirconia ball, and the diameter of the grinding medium is less than 5mm. When charging, control the quality of the grinding medium and the added material The ratio is 2:1;

[0034]Step 2: Put the batch material into a heat-resistant stainless steel mold, move the mold together with the batch material into the foaming kiln; start from room temperature, raise the temperature to 730 °C at a heating rate of 8 °C / min and keep it warm for 15 min; The heating rate of ℃ / min is raised to 1000 ℃ for 25 minutes; then, the temperature is lowered to below 50 ℃ at a cooling rate of 1 ℃ / min to ta...

Embodiment 3

[0038] Step 1: put 13% fly ash, 15% phosphate slag, 15% glass, 15% perlite, 20% pumice powder, 20% volcanic ash, and 2% potassium nitrate into a ball mill according to the mass fraction, and after ball milling for 30 hours , pass the ball milled powder through a 100-150 mesh standard sieve, and the sieve residue is less than 2%, to obtain the batch material; the grinding medium in the ball mill is a zirconia ball, and the diameter of the grinding medium is less than 5mm. When charging, control the quality of the grinding medium and the added material The ratio is 2:1;

[0039] Step 2: Put the batch material into a heat-resistant stainless steel mold, move the mold together with the batch material into the foaming kiln; start from room temperature, raise the temperature to 700 °C at a heating rate of 6 °C / min and keep it warm for 20 min; The heating rate of ℃ / min is raised to 900 ℃ for 30 minutes; then, the temperature is lowered to below 50 ℃ at a cooling rate of 1 ℃ / min to ta...

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Abstract

The invention discloses a porous slow-release selenium fertilizer and a preparation method thereof. The preparation method of the porous slow-release selenium fertilizer comprises the following steps:mixing and ball-milling fly ash, phosphorus slag, glass, perlite, pumice powder, volcanic ash and potassium nitrate, transferring the obtained mixture into a foaming kiln, foaming the mixture, and pelleting the mixture to prepare a spherical open-cell foamed porous matrix; putting selenium-rich mineral powder, diammonium hydrogen phosphate and potassium silicate into a mixer, and performing mixing to obtain a selenium-rich fertilizer slurry; and mixing the foamed porous matrix with the selenium-rich fertilizer slurry, and granulating the obtained mixture to obtain the porous slow-release selenium fertilizer. The porous slow-release selenium fertilizer takes porous glass as a carrier, and the selenium-containing minerals are processed to prepare the porous fertilizer, so that the porous slow-release selenium fertilizer has a higher fertilizer efficiency than common fertilizers,, has the effects of slow release, water retention and ventilation, cannot be in large-area contact with surrounding soil, and is beneficial to keeping the looseness of the soil.

Description

technical field [0001] The invention relates to a slow-release fertilizer, in particular to a porous slow-release selenium fertilizer and a preparation method thereof. Background technique [0002] Selenium has various pharmacological effects such as anti-cancer, heart protection, liver protection, prevention and treatment of myopia and cataract, detoxification, immunity enhancement, anti-aging and enhancement of reproductive function. It is known as "fire of life", "patron saint of the heart" and "King of Cancer". Selenium deficiency will not only make people suffer from serious physiological disorders, Kashin-Beck disease and Keshan disease, but also cause many other inconspicuous symptoms, such as immune function damage, thyroid function damage; easy depression, anxiety and cognitive dysfunction. decline; decreased fertility, etc. Selenium is an indispensable and important element in human life activities. As early as 1988, the Chinese Nutrition Society listed selenium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C03B19/08C03C11/00
CPCC03B19/08C03C11/007C05B7/00C05G3/00
Inventor 殷海荣张鸿鹏郭宏伟宋健波刘晶
Owner SHAANXI UNIV OF SCI & TECH
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