Method for producing calcium magnesium nitrate in shape of popcorn by using dolomite
阅读说明：本技术 一种利用白云石生产爆米花形状硝酸钙镁的方法 (Method for producing calcium magnesium nitrate in shape of popcorn by using dolomite ) 是由 王彦斌 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种利用白云石生产爆米花形状硝酸钙镁的方法,包括以下步骤:S1：加入反应釜中进行中和反应,其中白云石和稀硝酸的质量比为1：2.5；S2：调节PH值得到硝酸钙镁中和液；S3:进行压滤；S4:泵入预热系统进行预热；S5:泵入蒸发器进行蒸发浓缩,至硝酸钙镁的质量比重为：1.440～1.550g/cm～(3)；S6：将S5中蒸发好的浓缩的硝酸钙镁液体泵入冷却壶冷却到90-100℃；S7：将S6中冷却后的硝酸钙镁液体利用高压雾化喷头喷入圆盘造粒机。本发明产出的肥全水溶、不结块、且保水性能最优、具有抗升华特点、含量均匀、养分均衡、外观为不规则、爆米花形状,使用后使农作物对钙镁的吸收有显著提高。(The invention discloses a method for producing calcium magnesium nitrate in a popcorn shape by using dolomite, which comprises the following steps of S1: adding the mixture into a reaction kettle for neutralization reaction, wherein the mass ratio of dolomite to dilute nitric acid is 1: 2.5; s2: adjusting the pH value to obtain a calcium magnesium nitrate neutralizing solution; s3, performing filter pressing; s4, pumping into a preheating system for preheating; s5, pumping the mixture into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm 3 (ii) a S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃; s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing spray head. The fertilizer produced by the invention is fully water-soluble, does not agglomerate, has optimal water retention performance, has the characteristics of sublimation resistance, uniform content, balanced nutrients, irregular appearance and popcorn shape, and obviously improves the absorption of calcium and magnesium by crops after being used.)
1. A method for producing calcium magnesium nitrate in a popcorn shape by using dolomite is characterized by comprising the following steps:
s1: adding dolomite and dilute nitric acid liquid with the concentration of 50% -55% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, controlling the temperature to be 60-70 ℃ and stirring for 5 hours;
s2: adjusting the pH value of the solution after the reaction to 7-7.5 by using sodium hydroxide to obtain calcium magnesium nitrate neutralizing solution;
s3, performing pressure filtration on the neutralized liquid of calcium magnesium nitrate in the S2 through a plate and frame filter press to obtain clear liquid of calcium magnesium nitrate;
s4, pumping the calcium magnesium nitrate liquid which is subjected to pressure filtration in the S3 into a preheating system for preheating for 9 hours;
s5, pumping the preheated calcium magnesium nitrate liquid of S4 into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm3；
S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃;
s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing nozzle, and instantly cooling by using a blower in the spraying process of the high-pressure atomizing nozzle to obtain calcium magnesium nitrate crystals in irregular popcorn shapes.
2. The method for producing calcium magnesium nitrate in the shape of popcorn from dolomite according to claim 1, wherein in S1: adding dolomite and dilute nitric acid liquid with the concentration of 53% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, the temperature is controlled at 66 ℃ and stirring is carried out for 5 hours.
3. The method for producing calcium magnesium nitrate in the shape of popcorn from dolomite according to claim 1, wherein in S2: and (3) adjusting the pH value of the solution after the reaction to 7.3 by using sodium hydroxide to obtain a calcium magnesium nitrate neutralizing solution.
4. The method for producing calcium magnesium nitrate in the shape of popcorn from dolomite according to claim 1, wherein in S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in S5 into a cooling kettle to cool to 90-100 ℃.
Technical Field
The invention relates to the technical field of nitrogen fertilizer production, in particular to a method for producing popcorn-shaped calcium magnesium nitrate by utilizing dolomite.
Background
The medium elements in the current market mainly comprise calcium nitrate crystals, magnesium nitrate crystals, calcium magnesium nitrate particles, magnesium sulfate and other products. Wherein, single calcium nitrate crystal and magnesium nitrate crystal contain a large amount of free water, are easy to agglomerate, do not utilize long-term storage, and directly influence the sale and use. In addition, calcium magnesium nitrate granular fertilizers on the market are mainly simple and physically blended, so that the content of the calcium magnesium fertilizer is not uniform on each granule, and the calcium magnesium nutrition can be incompletely absorbed by crops in the using process, so that the nutrient deficiency can be caused. The magnesium sulfate fertilizer belongs to an acid fertilizer, and can cause soil acidification and hardening after long-term use. Therefore, a neutral calcium magnesium fertilizer product which is not easy to agglomerate and has uniform content is found, the transportation and the use of calcium and magnesium are facilitated for people, and the use, the utilization and the absorption of calcium and magnesium by crops are greatly improved.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a method for producing calcium magnesium nitrate in the shape of popcorn by utilizing dolomite, which has simple process and low cost.
In order to achieve the above objects, the present invention provides a method for producing calcium magnesium nitrate in the shape of popcorn using dolomite, comprising the steps of:
s1: adding dolomite and dilute nitric acid liquid with the concentration of 50% -55% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, controlling the temperature to be 60-70 ℃ and stirring for 5 hours;
s2: adjusting the pH value of the solution after the reaction to 7-7.5 by using sodium hydroxide to obtain calcium magnesium nitrate neutralizing solution;
s3, performing pressure filtration on the neutralized liquid of calcium magnesium nitrate in the S2 through a plate and frame filter press to obtain clear liquid of calcium magnesium nitrate;
s4, pumping the calcium magnesium nitrate liquid which is subjected to pressure filtration in the S3 into a preheating system for preheating for 9 hours;
s5, pumping the preheated calcium magnesium nitrate liquid of S4 into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm3；
S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃;
s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing nozzle, and instantly cooling by using a blower in the spraying process of the high-pressure atomizing nozzle to obtain calcium magnesium nitrate crystals in irregular popcorn shapes.
As a preferable mode of a method for producing calcium magnesium nitrate in a popcorn shape using dolomite, in S1: adding dolomite and dilute nitric acid liquid with the concentration of 53% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, the temperature is controlled at 66 ℃ and stirring is carried out for 5 hours.
As a preferable mode of a method for producing calcium magnesium nitrate in a popcorn shape using dolomite, in S2: and (3) adjusting the pH value of the solution after the reaction to 7.3 by using sodium hydroxide to obtain a calcium magnesium nitrate neutralizing solution.
As a preferable mode of a method for producing calcium magnesium nitrate in a popcorn shape using dolomite, in S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in S5 into a cooling kettle to cool to 90-100 ℃.
The invention thoroughly solves the problems of easy caking of the product, uneven content, unstable quality, soil acidification caused by long-term use and the like by adjusting the production process and utilizing the self-resource dolomite. The key point of the invention is to find the optimal proportion of the dolomite and the dilute nitric acid solution to synthesize the calcium magnesium nitrate, and obtain the calcium magnesium nitrate fertilizer on the basis.
The invention at least comprises the following beneficial effects:
according to the method for producing calcium magnesium nitrate in the shape of popcorn by using dolomite, the produced calcium magnesium nitrate is used in nitrogen fertilizer production, the produced fertilizer is completely water-soluble, does not agglomerate, has optimal water retention performance, has the characteristics of sublimation resistance, uniform content, balanced nutrients, irregular appearance and the shape of popcorn, and the calcium magnesium absorption of crops is obviously improved after the fertilizer is used.
Detailed Description
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
The invention provides a method for producing calcium magnesium nitrate in a popcorn shape by using dolomite, which comprises the following steps:
s1: adding dolomite and dilute nitric acid liquid with the concentration of 53% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, controlling the temperature at 66 ℃ and stirring for 5 hours;
s2: adjusting the pH value of the solution after the reaction to 7-7.5 by using sodium hydroxide to obtain calcium magnesium nitrate neutralizing solution;
s3, performing pressure filtration on the neutralized liquid of calcium magnesium nitrate in the S2 through a plate and frame filter press to obtain clear liquid of calcium magnesium nitrate;
s4, pumping the calcium magnesium nitrate liquid which is subjected to pressure filtration in the S3 into a preheating system for preheating for 9 hours;
s5, pumping the preheated calcium magnesium nitrate liquid of S4 into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm3；
S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃;
s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing nozzle, and instantly cooling by using a blower in the spraying process of the high-pressure atomizing nozzle to obtain calcium magnesium nitrate crystals in irregular popcorn shapes.
Example 2
A method for producing calcium magnesium nitrate in a shape of popcorn by using dolomite comprises the following steps:
s1: adding dolomite and dilute nitric acid liquid with the concentration of 50% -55% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, controlling the temperature to be 60-70 ℃ and stirring for 5 hours;
s2: adjusting the pH value of the solution after the reaction to 7.3 by using sodium hydroxide to obtain a calcium magnesium nitrate neutralizing solution;
s3, performing pressure filtration on the neutralized liquid of calcium magnesium nitrate in the S2 through a plate and frame filter press to obtain clear liquid of calcium magnesium nitrate;
s4, pumping the calcium magnesium nitrate liquid which is subjected to pressure filtration in the S3 into a preheating system for preheating for 9 hours;
s5, pumping the preheated calcium magnesium nitrate liquid of S4 into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm3；
S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃;
s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing nozzle, and instantly cooling by using a blower in the spraying process of the high-pressure atomizing nozzle to obtain calcium magnesium nitrate crystals in irregular popcorn shapes.
Example 3
A method for producing calcium magnesium nitrate in a shape of popcorn by using dolomite comprises the following steps:
s1: adding dolomite and dilute nitric acid liquid with the concentration of 50% -55% into a reaction kettle for neutralization reaction, wherein the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5, controlling the temperature to be 60-70 ℃ and stirring for 5 hours;
s2: adjusting the pH value of the solution after the reaction to 7-7.5 by using sodium hydroxide to obtain calcium magnesium nitrate neutralizing solution;
s3, performing pressure filtration on the neutralized liquid of calcium magnesium nitrate in the S2 through a plate and frame filter press to obtain clear liquid of calcium magnesium nitrate;
s4, pumping the calcium magnesium nitrate liquid which is subjected to pressure filtration in the S3 into a preheating system for preheating for 9 hours;
s5, pumping the preheated calcium magnesium nitrate liquid of S4 into an evaporator for evaporation and concentration until the mass proportion of the calcium magnesium nitrate is as follows: 1.440-1.550 g/cm3；
S6: pumping the concentrated calcium magnesium nitrate liquid evaporated in the S5 into a cooling pot to be cooled to 90-100 ℃;
s7: and (4) spraying the calcium magnesium nitrate liquid cooled in the step (S6) into a disc granulator by using a high-pressure atomizing nozzle, and instantly cooling by using a blower in the spraying process of the high-pressure atomizing nozzle to obtain calcium magnesium nitrate crystals in irregular popcorn shapes.
Example 4
Influence of the proportion of dolomite and dilute nitric acid on the fertilizer
Anti-caking experiment verification
Experimental groups: 100kg of calcium magnesium nitrate crystals are produced according to the method of the invention;
control group 1: adjusting the mass ratio of dolomite to dilute nitric acid in S1 to 1: 2, the other steps are not changed, and 100kg of calcium magnesium nitrate crystals are produced;
control group 2: adjusting the mass ratio of dolomite to dilute nitric acid in S1 to 1: 3, the other steps are not changed, and 100kg of calcium magnesium nitrate crystals are produced;
the experimental method comprises the following steps: respectively filling the calcium magnesium nitrate crystals obtained from the experimental group, the control group 1 and the control group 2 into snake skin bags of the same type, placing the snake skin bags in the same ventilation chamber, standing for 6 months, respectively sieving the calcium magnesium nitrate crystals of the experimental group, the control group 1 and the control group 2 through a sieve with the aperture of 3mm at one time, weighing and counting the lumps remained in the sieve, wherein the results are as follows
Table 1:
mass of knot block (unit kg)
Granular crystal mass (unit kg)
Experimental group
5.2
94.7
Control group 1
12.6
87.1
Control group 2
14.6
85.1
Table 2:
the results show that:
1. the mass of the experimental block is the minimum, so the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5 the crystal of calcium magnesium nitrate has the lowest caking rate and the proportion is the best.
2. The total mass reduction of the experimental group is minimum, so the mass ratio of the dolomite to the dilute nitric acid is 1: 2.5 the produced calcium magnesium nitrate crystal has the lowest sublimation rate and the strongest water retention performance, and the proportioning ratio is the best.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, and the invention is thus not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.