阅读说明：本技术 一种富含硒中微量元素肥及制备方法 (selenium-rich medium-trace element fertilizer and preparation method thereof ) 是由 于洪 奚英洲 朱磊 程永强 崔志刚 张平 于 2019-12-11 设计创作，主要内容包括：本发明提出的是一种富含硒的中微量元素肥及制备方法。其元素组成：K<Sub>2</Sub>O≥4.0%,MgO≥5%,CaO≥30%,SiO<Sub>2</Sub>≥23%,以三氧化硫计有效硫5%,硒150ppm～600ppm,同时含有Zn、Cu、Mn、Fe、Cl<Sup>-</Sup>、Mo、B有益元素。采用钾长石、伊利石、钙硅质粉,混合研磨煅烧后再进行二次研磨制取中微量元素肥；将精硒加入浓硝酸,制取亚硒酸溶液,溶液中加入可溶性钠盐或钾盐制取亚硒酸钠盐/钾盐制剂；加入粘结剂的中微量元素肥同时喷洒亚硒酸钠或亚硒酸钾溶液,获得富硒品质,同时含有Zn、Cu、Mn、Fe、Cl<Sup>-</Sup>、Mo、B有益元素,营养元素全面。钾长石、伊利石、钙硅质粉原料充足,廉价易得,具有富硅、钾、钙,低铝。适宜作为富含硒中微量元素肥应用。(The invention provides selenium-rich medium-trace element fertilizers and a preparation method thereof, wherein the element composition of the fertilizers is K 2 O≥4.0%，MgO≥5%，CaO≥30%，SiO 2 More than or equal to 23 percent, 5 percent of available sulfur calculated by sulfur trioxide, 150ppm to 600ppm of selenium, and Zn, Cu, Mn, Fe and Cl ‑ Mo and B. Mixing, grinding and calcining potassium feldspar, illite and calcium-silicon powder, and then grinding for the second time to prepare the medium and trace element fertilizer; adding concentrated nitric acid into refined selenium to prepare selenious acid solution, and adding soluble sodium salt or potassium salt into the solution to prepare selenious acid sodium salt/potassium salt preparation; spraying sodium selenite or potassium selenite solution simultaneously with the medium trace element fertilizer added with the binder to obtain selenium-rich fertilizer containing Zn, Cu, Mn, Fe and Cl ‑ Mo and B are beneficial elements and comprehensive nutrient elements. The potassium feldspar, illite and calcium-silicon powder are abundant in raw materials, cheap and easy to obtain, and rich in silicon, potassium and calcium and low in aluminum. Is suitable for being used as a medium trace element rich in seleniumApplication of the fertilizer.)

1, kinds of selenium-rich medium and trace element fertilizer, which is characterized in that the element composition is K₂O≥4.0%，MgO≥5%，CaO≥30%，SiO₂More than or equal to 23 percent, 5 percent of available sulfur calculated by sulfur trioxide, 150ppm to 600ppm of selenium, and Zn, Cu, Mn, Fe and Cl^-Mo and B.

2, kinds of selenium-rich medium and trace element fertilizer preparation method, which is characterized by comprising the following steps:

step :

a. raw materials: weighing potassium feldspar, illite and calcium-silicon powder, and mixing the components in proportion, wherein the potassium feldspar comprises the following components: 40-60%, illite: 10-20%, calcium-silicon powder: 20-30%;

b. crushing and grinding: grinding to-200 mesh with a wheel mill, adding water into a stirrer, stirring, feeding into a brick making machine, making into brick, and drying;

c. and (3) calcining: calcining in a tunnel kiln at the calcining temperature of 1000-1100 ℃ for 30min, and discharging;

d. and (3) secondary grinding: grinding the product discharged from the kiln to-100 meshes by a ball mill to obtain the medium and trace element fertilizer;

step two:

a. weighing 1kg of refined selenium with the purity of 99.8 percent, and adding 50kg of the refined selenium into 68 percent concentrated nitric acid to prepare selenious acid solution;

b. adding soluble sodium salt or potassium salt into the solution a to prepare a sodium selenite/potassium salt preparation, wherein the molar mass ratio of the solution a to the soluble sodium salt or potassium salt is 4: 1, adjusting the pH value to 9.0, filtering and concentrating the filtrate;

step three:

a. adding 3% of binder into the prepared medium trace element fertilizer, uniformly mixing, and feeding into a disc granulator, wherein the binder is cellulose and bentonite;

b. spraying the prepared sodium selenite or potassium selenite concentrated solution to a disc granulator, wherein the spraying weight percentage ratio is 0.05% -1%, and preparing a 2-4 mm granular product in the disc granulator;

step four:

a. drying, metering and packaging to obtain a finished product.

Technical Field

The invention relates to the technical field of soil fertilizers, in particular to a selenium-rich medium-trace element fertilizer and a preparation method thereof.

Background

At present, nutrient elements required by plants comprise 17 elements, and can be divided into a large amount of elements, a medium amount of elements and trace elements, wherein the large amount of elements comprise nitrogen (N), phosphorus (P) and potassium (K), the medium amount of elements comprise sulfur (S), calcium (Ca), silicon (Si) and magnesium (Mg), and the trace elements comprise boron (B), iron (Fe), copper (Cu), zinc (Zn), manganese (Mn), selenium (Se) and the like.

In addition, , the selenium element is an indispensable trace element for human bodies to maintain normal life activities, has strong oxidation resistance and improves human immunity, and the human bodies can effectively prevent and treat more than 40 diseases including cancers by taking a proper amount of selenium element through crops.

Disclosure of Invention

In order to prepare fertilizer rich in Se, trace elements and beneficial secondary elements, kinds of Se-rich fertilizer and its preparing process are disclosedSpraying sodium selenite or potassium selenite solution to the medium trace element fertilizer containing binder to obtain selenium-rich fertilizer containing Zn, Cu, Mn, Fe and Cl^-Mo and B are beneficial elements and comprehensive nutrient elements, and the technical problem that the fertilizer simultaneously contains medium and trace elements is solved.

The technical scheme adopted by the invention for solving the technical problems is as follows:

selenium-rich medium-trace element fertilizer, which consists of K₂O≥4.0%，MgO≥5%，CaO≥30%，SiO₂More than or equal to 23 percent, 5 percent of available sulfur calculated by sulfur trioxide, 150ppm to 600ppm of selenium, and Zn, Cu, Mn, Fe and Cl^-Mo and B;

A preparation method of selenium-rich medium-trace element fertilizer, comprising the following steps:

step :

a. raw materials: weighing potassium feldspar, illite and calcium-silicon powder, and mixing the components in proportion, wherein the potassium feldspar comprises the following components: 40-60%, illite: 10-20%, calcium-silicon powder: 20-30%;

b. crushing and grinding: grinding to-200 mesh with a wheel mill, adding water into a stirrer, stirring, feeding into a brick making machine, making into brick, and drying;

c. and (3) calcining: calcining in a tunnel kiln at the calcining temperature of 1000-1100 ℃ for 30min, and discharging;

d. and (3) secondary grinding: grinding the product discharged from the kiln to-100 meshes by a ball mill to obtain the medium and trace element fertilizer;

step two:

a. weighing 1kg of refined selenium with the purity of 99.8 percent, and adding 50kg of the refined selenium into 68 percent concentrated nitric acid to prepare selenious acid solution;

b. adding soluble sodium salt or potassium salt into the solution a to prepare a sodium selenite/potassium salt preparation, wherein the molar mass ratio of the solution a to the soluble sodium salt or potassium salt is 4: 1, adjusting the pH value to 9.0, filtering and concentrating the filtrate;

step three:

a. adding 3% of binder into the prepared medium trace element fertilizer, uniformly mixing, and feeding into a disc granulator, wherein the binder is cellulose and bentonite;

b. spraying the prepared sodium selenite or potassium selenite concentrated solution to a disc granulator, wherein the spraying weight percentage ratio is 0.05% -1%, and preparing a 2-4 mm granular product in the disc granulator.

Step four:

a. drying, metering and packaging to obtain a finished product.

The method has the advantages that the potash feldspar, the illite and the calcium-silicon powder are mixed, ground and calcined, and then ground for the second time to prepare the medium and trace element fertilizer; adding concentrated nitric acid into refined selenium to obtain soluble sodium salt or potassium salt to obtain sodium selenite/potassium salt preparation; spraying sodium selenite or potassium selenite solution simultaneously with the medium trace element fertilizer added with the binder to obtain selenium-rich fertilizer containing Zn, Cu, Mn, Fe and Cl^-Mo and B are beneficial elements and comprehensive nutrient elements. The potash feldspar, illite and calcium-silicon powder are abundant in raw materials, cheap and easy to obtain, have the characteristics of being rich in silicon, potassium, calcium and low in aluminum and containing a large amount of trace mineral elements, are low in heavy metal element content and meet the relevant national standard of agricultural fertilizers. Is suitable for being used as a selenium-rich medium-trace element fertilizer.

Drawings

FIG. 1 is a flow chart of the preparation process of the present invention.

Detailed Description

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

As shown in the figure, selenium-rich medium-trace element fertilizers comprise K₂O≥4.0%，MgO≥5%，CaO≥30%，SiO₂More than or equal to 23 percent, 5 percent of available sulfur calculated by sulfur trioxide, 150ppm to 600ppm of selenium, and Zn, Cu, Mn, Fe and Cl^-Mo and B;

A preparation method of selenium-rich medium-trace element fertilizer, comprising the following steps:

step :

a. raw materials: weighing potassium feldspar, illite and calcium-silicon powder, and mixing the components in proportion, wherein the potassium feldspar comprises the following components: 40-60%, illite: 10-20%, calcium-silicon powder: 20-30%;

b. crushing and grinding: grinding to-200 mesh with a wheel mill, adding water into a stirrer, stirring, feeding into a brick making machine, making into brick, and drying;

c. and (3) calcining: calcining in a tunnel kiln at the calcining temperature of 1000-1100 ℃ for 30min, and discharging;

d. and (3) secondary grinding: grinding the product discharged from the kiln to-100 meshes by a ball mill to obtain the medium and trace element fertilizer;

step two:

a. weighing 1kg of refined selenium with the purity of 99.8 percent, and adding 50kg of the refined selenium into 68 percent concentrated nitric acid to prepare selenious acid solution;

b. adding soluble sodium salt or potassium salt into the solution a to prepare a sodium selenite/potassium salt preparation, wherein the molar mass ratio of the solution a to the soluble sodium salt or potassium salt is 4: 1, adjusting the pH value to 9.0, filtering and concentrating the filtrate;

step three:

a. adding 3% of binder into the prepared medium trace element fertilizer, uniformly mixing, and feeding into a disc granulator, wherein the binder is cellulose and bentonite;

b. spraying the prepared sodium selenite or potassium selenite concentrated solution to a disc granulator, wherein the spraying weight percentage ratio is 0.05% -1%, and preparing a 2-4 mm granular product in the disc granulator.

Step four:

a. drying, metering and packaging to obtain a finished product.