CN114031443A - Medium-element water-insoluble solid fertilizer and preparation method thereof - Google Patents
Medium-element water-insoluble solid fertilizer and preparation method thereof Download PDFInfo
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- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
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- C—CHEMISTRY; METALLURGY
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- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
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Abstract
The invention discloses a medium element water-insoluble solid fertilizer and a preparation method thereof, wherein the medium element water-insoluble solid fertilizer is 4000-12500 meshes and comprises, by weight, 40-50 parts of light calcium carbonate, 40-50 parts of light magnesium hydroxide, 5-15 parts of fumed silica and 1-5 parts of a dispersing agent, wherein the purity of the light calcium carbonate is 99% or more, the purity of the light magnesium hydroxide is 99% or more, and the purity of the fumed silica is 99% or more. The invention takes three high-purity light magnesium hydroxide, light calcium carbonate and fumed silica as basic raw materials, and can obtain the medium element water-insoluble solid fertilizer which has light specific gravity and high fineness and is not easy to settle in dilution water under the action of the dispersant, so that the medium element water-insoluble solid fertilizer can be further used for drip irrigation and flushing spraying, the pH value of soil can be improved, and the fertilizer efficiency time can be prolonged.
Description
Technical Field
The invention belongs to the technical field of secondary element fertilizers, and particularly relates to a secondary element water-insoluble solid fertilizer and a preparation method thereof.
Background
In recent decades, agriculture in China has been rapidly promoted, but the environmental conditions of agricultural resources are changing profoundly, especially the soil environment. Due to long-term unreasonable fertilization modes, particularly large application of chemical fertilizer nitrogen fertilizers, atmospheric acid sedimentation and industrial pollutant invasion, soil hardening, soil poisoning, soil-borne diseases, soil acidification, soil salinization and the like are increasingly serious, and soil nutrient element proportion imbalance and acidification are main causes of the fertilizer, including comprehensive loss of medium elements such as calcium, silicon, magnesium, sulfur and the like, more specifically, the medium elements such as calcium accounts for 64% below a critical value of the deficiency, magnesium accounts for 53%, silicon is deficient for about 4000 ten thousand tons/year in the national farmland, and in addition, sulfur is lost to different degrees. Soil acidification of cultivated land in China is aggravated, soil acidification is particularly serious in most regions in south, Jiaodong peninsula and northeast, agricultural production is directly influenced, and the yield of crops is reduced as a direct result of imbalance of soil nutrient element proportion and acidification.
The medium element water-soluble fertilizer can be completely and rapidly dissolved in water and is easy to be absorbed by crops, so the medium element fertilizer is usually prepared into the water-soluble fertilizer at present. In the current market, medium-element water-soluble fertilizers mainly comprise calcium magnesium nitrate, calcium ammonium nitrate, calcium chloride and the like, and all contain acid radical ions, so that soil acidification is caused, particularly soil in south is seriously acidified, large rainwater fertilizer is seriously lost, although drip irrigation, flushing application and spraying can be carried out, the absorption energy of root systems is weakened in an acid environment, particularly, acidification near a drip irrigation outflow port is very serious, so that fertilizer waste is caused, and the quality of crops is low. Meanwhile, magnesium hydroxide and calcium carbonate are mainly used, but the commercially available magnesium hydroxide and calcium carbonate raw materials are derived from brucite ore or other ores, namely, the ores are directly crushed and pulverized to obtain the magnesium hydroxide and calcium carbonate raw materials, a large amount of auxiliary agents which are useless for crops are required to be added due to the fact that the raw materials of magnesium hydroxide and calcium carbonate contain a large amount of impurities and heavy metals and have heavy specific gravity, and the water content is generally 50-70%, so that the packaging cost and the transportation cost are increased undoubtedly.
Therefore, a medium element water-insoluble solid fertilizer and a preparation method thereof are needed to solve the defects of the prior art.
Disclosure of Invention
The invention aims to provide a secondary element water-insoluble solid fertilizer which can improve the pH value of soil, prolong the fertilizer efficiency time, reduce the cost and is used for drip irrigation and flushing spraying.
The invention further aims to provide a preparation method of the secondary element water-insoluble solid fertilizer, which can be used for preparing the secondary element water-insoluble solid fertilizer which can improve the pH value of soil, prolong the fertilizer efficiency time, save the cost and can be used for drip irrigation and flushing application.
In order to achieve the purpose, the invention provides a medium element water-insoluble solid fertilizer, which is 4000-12500 meshes and comprises, by weight, 40-50 parts of light calcium carbonate, 40-50 parts of light magnesium hydroxide, 5-15 parts of fumed silica and 1-5 parts of a dispersing agent, wherein the purity of the light calcium carbonate is 99% or more, the purity of the light magnesium hydroxide is 99% or more, and the purity of the fumed silica is 99% or more.
Compared with the prior art, the invention takes three high-purity light magnesium hydroxide, light calcium carbonate and fumed silica as basic raw materials, and can obtain the medium element non-water-soluble solid fertilizer which has light specific gravity and high fineness and is not easy to settle in the dilution water under the action of the dispersant, and further can be used for drip irrigation and flushing spraying; the light magnesium hydroxide and light calcium carbonate in the medium element water-insoluble solid fertilizer can react with acid in soil, so that the pH value of the soil can be increased; the light magnesium hydroxide, the light calcium carbonate and the fumed silica are insoluble in water, so that the loss speed of the medium element water-insoluble solid fertilizer in soil can be reduced, and the fertilizer efficiency time can be further prolonged; the medium element water-insoluble solid fertilizer contains no water, has small volume, saves the packaging cost and the transportation cost, and further reduces the cost.
Preferably, the invention also comprises 1-4 parts of sulfur, specifically, the purity of the sulfur is 99% or more, the sulfur is insoluble in water, and the content of sulfur elements in crops can be improved by adding the sulfur.
Preferably, the invention also comprises 1-2 parts of citric acid chelating salt. Specifically, the purity of the citric acid chelated salt is 99% or more, and the citric acid chelated salt can improve trace elements in soil. Specifically, the citric acid chelated salt comprises chelated trace elements and a chelating agent, wherein the chelated trace elements are one or a combination of more of copper, manganese, iron, zinc, boron and molybdenum, and the chelating agent is citric acid. More specifically, the contents of the chelated trace elements in the citric acid chelated salt are respectively as follows by mass percent: 3.5-6.5% of zinc, 0.5-5.5% of iron, 1.5-2.7% of manganese, 0.5-2.0% of copper, 0.1-0.4% of molybdenum and 2-5% of boron.
Preferably, the invention also comprises at least one of 1-3 parts of polyglutamic acid, 1-2 parts of sugar alcohol, 1-2 parts of seaweed extract and 1-2 parts of chitosan oligosaccharide. The sugar alcohol, the seaweed extract, the polyglutamic acid and the chitosan oligosaccharide contain rich trace elements and promote the absorption of calcium, magnesium and silicon and other elements in soil.
Preferably, the dispersant of the present invention comprises at least one of calcium lignosulfonate and magnesium lignosulfonate.
Preferably, the preparation of the precipitated calcium carbonate of the present invention comprises: the calcium carbonate raw material is calcined at high temperature to generate calcium oxide, the calcium oxide is reduced by carbon dioxide to generate light calcium carbonate with the purity of 99 percent or more, the calcium carbonate raw material is at least one of calcite, limestone, marble and oyster shell, and compared with the calcium carbonate prepared by directly crushing and pulverizing ores, the light calcium carbonate has the advantages of low heavy metal content, less impurities, light specific gravity and high purity.
Preferably, the preparation of the light magnesium hydroxide of the present invention comprises: the magnesium chloride raw material reacts with the lime milk to generate magnesium hydroxide precipitate, and the magnesium hydroxide precipitate is purified to obtain light magnesium hydroxide with the purity of 99% or more, specifically, the magnesium chloride raw material is at least one of chloromagnesite, halogen blocks, halogen sheets, halogen powder, salt lake bittern and brine. More specifically, the purification process comprises: and pulping the magnesium hydroxide precipitate and a magnesium chloride solution, and refining the magnesium hydroxide slurry under the action of an external physical field. Because the absorption rates of the magnesium hydroxide and the calcium hydroxide to the energy of the physical field are different, the calcium hydroxide absorbs the energy quickly and dissolves out, so that the high-efficiency separation of a small amount of calcium hydroxide in the magnesium hydroxide product is realized, and the light magnesium hydroxide with the purity of 99 percent or more is further prepared. Compared with the method for preparing magnesium hydroxide by directly crushing and pulverizing ores, the method for preparing magnesium hydroxide by using the magnesium chloride has the advantages that the magnesium chloride raw material reacts with lime milk, and the magnesium hydroxide obtained by purification has the characteristics of high purity, less impurities and light specific gravity.
Preferably, the preparation of the fumed silica of the invention comprises: the halogen silane is hydrolyzed and condensed at high temperature in oxyhydrogen flame to generate silicon dioxide particles, and the silicon dioxide particles are subjected to quenching, aggregation, separation and deacidification processes in sequence to obtain the gas-phase silicon dioxide with the purity of 99 percent or more. Specifically, the halosilane includes silicon tetrachloride, chlorosilane, or methyl silicon trichloride. Compared with the silicon dioxide prepared by directly crushing and pulverizing ores, the silicon dioxide has the advantages of high purity, less impurities, light specific gravity and high activity.
In order to achieve the aim, the invention provides a preparation method of a secondary element water-insoluble solid fertilizer, which comprises the following steps:
(1) mixing 40-50 parts of light calcium carbonate, 40-50 parts of light magnesium hydroxide, 5-15 parts of fumed silica and 1-5 parts of a dispersing agent to obtain a first mixture, wherein the purity of the light calcium carbonate is 99% or more, the purity of the light magnesium hydroxide is 99% or more, and the purity of the fumed silica is 99% or more;
(2) crushing the first mixture to 4000-12500 meshes by using a crusher to obtain a medium element water-insoluble solid fertilizer;
the contents of the above substances are all calculated by weight parts.
Preferably, the first mixture and the second mixture are ground to 4000-12500 meshes by a grinder to obtain the medium-element water-insoluble solid fertilizer, wherein the second mixture is at least one selected from 1-4 parts of sulfur, 1-2 parts of citric acid chelate salt, 1-3 parts of polyglutamic acid, 1-2 parts of sugar alcohol, 1-2 parts of trehalamine and 1-2 parts of chitosan oligosaccharide. More specifically, the medium-element water-insoluble solid fertilizer can be in the forms of more and less calcium and magnesium, balanced calcium and magnesium and less calcium and can also be added with at least one of sulfur, citric acid chelating salt, polyglutamic acid, sugar alcohol, seaweed extract and chitosan oligosaccharide, so that the crops contain abundant trace elements.
Detailed Description
In order to explain the technical solution, the object and the technical effect of the present invention in detail, the following description is made with reference to specific examples. Specifically, the light calcium carbonate and the light magnesium hydroxide in examples 1 to 5 and comparative example 1 can be prepared by the following methods; the fumed silicas of examples 1-5 and comparative examples 2-3 can be prepared by the following method; other starting materials were obtained by commercial purchase:
the preparation of the light calcium carbonate comprises the following steps: a. pulverizing calcite, grinding to 0.3mm, calcining at 765 deg.C under-85 KPa and negative pressure for 65min, and introducing oxygen during calcining to obtain calcium oxide powder; b. pulverizing calcium oxide powder to 20 μm, adding into hot water for digestion, stirring at high speed to obtain calcium hydroxide suspension with mass fraction of 0.25%; c. respectively passing the calcium hydroxide suspension and the carbon dioxide compressed gas through a two-fluid atomization nozzle, and dispersing the calcium hydroxide suspension into micron-sized droplets by high-pressure carbon dioxide while carrying out carbonization reaction to generate light calcium carbonate with the purity of 99% or more.
The preparation of the light magnesium hydroxide comprises the following steps: a. 160ml of MgCl with a concentration of 1.04mol/l are added2Placing the solution in a reactor and heating to 65 ℃; b. 210mL of 62.5g/L Ca (OH) was added dropwise with stirring2The emulsion is used for 3 hours, continuously stirred for 2 hours and filtered; c. the filter cake was placed in a reactor and 60mL of MgCl at a concentration of 0.2mol/L was added2Stirring and pulping the solution for 30min, placing the solution in an ultrasonic generator, and carrying out refining reaction for 15min under the action of ultrasonic waves; d. filtering and washing reacted slurry; the filter cake is dried for 5h at 105 ℃ to obtain the magnesium hydroxide with the purity of 99 percent or more.
The preparation of fumed silica comprises: a. heating chlorosilane to a vaporization state, and then controlling the flow rate and the flow rate of the chlorosilane to be 1000m at 280kg/h3Mixing air per hour, and then uniformly mixing the air with hydrogen with the flow rate of 20 kg/hour; b. heating to 300 deg.C, igniting, burning and hydrolyzing at 48m/h in reactor at 1200 deg.C, quenching, aggregating, separating, and deacidifying to obtain fumed silica with purity of 99% or above.
Example 1
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises, by weight, 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6% and 1 part of calcium lignosulphonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6% and 1 part of calcium lignosulfonate to obtain a first mixture;
(2) and (3) crushing the first mixture to 6000 meshes by using an airflow crusher to obtain the medium element water-insoluble solid fertilizer.
Example 2
A9000-mesh water-insoluble solid fertilizer containing medium elements comprises, by weight, 45 parts of light calcium carbonate with the purity of 99.5%, 45 parts of light magnesium hydroxide with the purity of 99.5%, 10 parts of fumed silica with the purity of 99.2% and 4 parts of calcium lignosulfonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 45 parts of light calcium carbonate with the purity of 99.5%, 45 parts of light magnesium hydroxide with the purity of 99.5%, 10 parts of fumed silica with the purity of 99.2% and 4 parts of calcium lignosulfonate to obtain a first mixture;
(2) and (3) crushing the first mixture to 9000 meshes by using an airflow crusher to obtain the medium-element water-insoluble solid fertilizer.
Example 3
A medium element water-insoluble solid fertilizer is 12000 meshes and comprises 40 parts by weight of light calcium carbonate with the purity of 99.8 percent, 50 parts by weight of light magnesium hydroxide with the purity of 99.5 percent, 15 parts by weight of fumed silica with the purity of 99.8 percent and 5 parts by weight of magnesium lignosulfonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 40 parts of light calcium carbonate with the purity of 99.8%, 50 parts of light magnesium hydroxide with the purity of 99.5%, 15 parts of fumed silica with the purity of 99.8% and 5 parts of magnesium lignosulfonate to obtain a first mixture;
(2) and crushing the first mixture into 12000 meshes by using an airflow crusher to obtain the medium element water-insoluble solid fertilizer.
Example 4
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises, by weight, 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6%, 1 part of calcium lignosulfonate, 4 parts of sulfur, 2 parts of citric acid chelate salt, 1 part of polyglutamic acid, 2 parts of sugar alcohol, 1 part of seaweed extract and 1 part of chitosan oligosaccharide;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6% and 1 part of calcium lignosulfonate to obtain a first mixture;
(2) crushing the first mixture and the second mixture to 6000 meshes by using an airflow crusher to obtain a medium-element water-insoluble solid fertilizer, wherein the second mixture is a mixture of 4 parts of sulfur, 2 parts of citric acid chelated salt, 1 part of polyglutamic acid, 2 parts of sugar alcohol, 1 part of seaweed extract and 1 part of chitosan oligosaccharide;
the citric acid chelate salt comprises, by mass, 3.5% of zinc, 5.5% of iron, 2% of manganese, 0.5% of copper, 0.1% of molybdenum, 4% of boron and 84.4% of citric acid.
Example 5
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises, by weight, 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6%, 1 part of calcium lignosulfonate, 4 parts of sulfur, 2 parts of citric acid chelate salt, 2 parts of polyglutamic acid, 1 part of sugar alcohol and 2 parts of seaweed extract;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of fumed silica with the purity of 99.6% and 1 part of calcium lignosulfonate to obtain a first mixture;
(2) crushing the first mixture and the second mixture to 6000 meshes by using an airflow crusher to obtain a medium-element water-insoluble solid fertilizer, wherein the second mixture is a mixture of 4 parts of sulfur, 2 parts of citric acid chelated salt, 2 parts of polyglutamic acid, 1 part of sugar alcohol and 2 parts of seaweed extract;
the citric acid chelate salt comprises, by mass, 5.5% of zinc, 3.5% of iron, 2% of manganese, 0.5% of copper, 0.1% of molybdenum, 5% of boron and 83.4% of citric acid.
Comparative example 1
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises, by weight, 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of nano diatomite and 1 part of calcium lignosulphonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of light calcium carbonate with the purity of 99.2%, 40 parts of light magnesium hydroxide with the purity of 99.5%, 5 parts of nano kieselguhr and 1 part of calcium lignosulphonate to obtain a first mixture;
(2) and (3) crushing the first mixture to 6000 meshes by using an airflow crusher to obtain the medium element water-insoluble solid fertilizer.
Comparative example 2
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises 50 parts by weight of heavy calcium carbonate with the purity of 99.2 percent, 40 parts by weight of heavy magnesium hydroxide with the purity of 87 percent, 5 parts by weight of fumed silica with the purity of 99.6 percent and 1 part by weight of calcium lignosulphonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of ground calcium carbonate with the purity of 99.2%, 40 parts of ground magnesium hydroxide with the purity of 87%, 5 parts of fumed silica with the purity of 99.6% and 1 part of calcium lignosulfonate to obtain a first mixture;
(2) crushing the first mixture to 6000 meshes by using an airflow crusher to obtain a medium element water-insoluble solid fertilizer;
wherein the heavy calcium carbonate is prepared by directly crushing and pulverizing calcite, and the heavy magnesium hydroxide is prepared by directly crushing and pulverizing brucite.
Comparative example 3
A medium element water-insoluble solid fertilizer is 6000 meshes and comprises, by weight, 50 parts of calcium nitrate, 40 parts of magnesium nitrate, 5 parts of fumed silica with the purity of 99.6 percent and 1 part of calcium lignosulfonate;
the preparation method of the medium element water-insoluble solid fertilizer comprises the following steps of:
(1) mixing 50 parts of calcium nitrate, 40 parts of magnesium nitrate, 5 parts of fumed silica with the purity of 99.6 percent and 1 part of calcium lignosulfonate to obtain a first mixture;
(2) and (3) crushing the first mixture to 6000 meshes by using an airflow crusher to obtain the medium element water-insoluble solid fertilizer.
The medium element water-insoluble solid fertilizer m g of examples 1-5 and comparative examples 1-3 was weighed and added to v ml of water (3000 ml/g) respectively to be mixed uniformly for later use.
Selecting 9 mu farmlands to plant tomatoes with basically consistent growth vigor, dividing the tomatoes into 9 groups, wherein the first group, the second group, the third group, the fourth group and the fifth group respectively correspond to the fertilizers in the examples 1-5, the sixth group, the seventh group and the eighth group respectively correspond to the fertilizers in the comparative examples 1, 2 and 3, the ninth group is a blank test (no fertilizer is applied), fertilizing the tomatoes by adopting drip irrigation equipment on the 5 th day after planting, wherein the fertilizing time and the fertilizing amount are the same, selecting a tomato with the best growth vigor from each group on the 20 th day and the 45 th day after planting, detecting the growth condition and the quality of the tomato leaf surfaces, measuring the contents of calcium, magnesium, silicon and sulfur in the tomatoes, and detecting the pH value of soil, wherein the results are shown in the tables 1-2.
In the fertilization, the nozzles of the drip irrigation devices of the sixth group and the seventh group are found to be seriously blocked, so that the fertilization cannot be carried out, and therefore, the tests of the sixth group and the seventh group cannot be carried out continuously, which shows that the solid fertilizer prepared in comparative examples 1-2 is easy to settle in the diluted water and further blocks the nozzles, and shows that the silicon raw material is selected from fumed silica, and because the specific surface area is large, the dry powder is mixed to prevent caking, the fertilizer dispersibility is improved after the water is added, the sedimentation is prevented, the irrigation drip irrigation is carried out to increase the fluidity, and further the nozzles cannot be blocked, and when the silicon raw material is selected from nano diatomite, the stability of the solid fertilizer is damaged, and further the nozzles are blocked; and if the raw materials are directly crushed and pulverized by ores, the solid fertilizer is precipitated in the dilution water without adding an auxiliary agent. Therefore, the invention takes three high-purity light magnesium hydroxide, light calcium carbonate and fumed silica as basic raw materials, and can obtain the medium element water-insoluble solid fertilizer which has light specific gravity and high fineness and is not easy to settle in the dilution water under the action of the dispersant, and further can be used for drip irrigation and flushing spraying.
TABLE 1 growth and quality of tomatoes
TABLE 2 contents of secondary elements in leaf surface and pH of soil
As can be seen from table 1, the fertilizer efficiency of the first to third groups of medium element water-insoluble solid fertilizers is higher than that of the eighth to ninth groups, because the eighth group of medium element water-soluble fertilizers mainly comprises calcium magnesium nitrate and calcium ammonium nitrate and contains acid radical ions, soil acidification is caused, and the absorption energy of crop roots in an acidic environment is weakened, thereby affecting crop growth; meanwhile, the fertilizer efficiency of the medium element water-insoluble solid fertilizers of the fourth group to the fifth group is higher than that of the first group to the third group, which shows that the addition of the trace elements can promote the absorption of calcium, magnesium and silicon and other elements in soil, thereby further promoting the growth of crops.
As can be seen from table 2, the fertilizer efficiency time of the first to third groups of the medium element water-insoluble solid fertilizers is longer than that of the eighth group, because the light magnesium hydroxide, the light calcium carbonate and the fumed silica are insoluble in water, the loss speed of the medium element water-insoluble solid fertilizers in the soil can be reduced, and the fertilizer efficiency time can be further prolonged; meanwhile, the PH value of the soil of the first group to the third group is higher than that of the soil of the eighth group, because the light magnesium hydroxide and the light calcium carbonate in the medium element water-insoluble solid fertilizer can react with acid in the soil, and the PH value of the soil can be further improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A medium element water-insoluble solid fertilizer is characterized by being 4000-12500 meshes and comprising, by weight, 40-50 parts of light calcium carbonate, 40-50 parts of light magnesium hydroxide, 5-15 parts of fumed silica and 1-5 parts of a dispersing agent, wherein the purity of the light calcium carbonate is 99% or more, the purity of the light magnesium hydroxide is 99% or more, and the purity of the fumed silica is 99% or more.
2. The medium element water-insoluble solid fertilizer according to claim 1, further comprising 1 to 4 parts of sulfur.
3. The medium element water-insoluble solid fertilizer according to claim 1, further comprising 1-2 parts of a citric acid chelate salt.
4. The medium element water-insoluble solid fertilizer according to claim 1, further comprising at least one of 1 to 3 parts of polyglutamic acid, 1 to 2 parts of sugar alcohol, 1 to 2 parts of alginic acid, and 1 to 2 parts of chitosan oligosaccharide.
5. The medium element water-insoluble solid fertilizer according to claim 1, wherein said dispersant comprises at least one of calcium lignosulfonate and magnesium lignosulfonate.
6. The medium element water-insoluble solid fertilizer according to claim 1, wherein said precipitated calcium carbonate is produced by: calcium carbonate raw materials are calcined at high temperature to generate calcium oxide, the calcium oxide is reduced by carbon dioxide to generate the light calcium carbonate with the purity of 99% or more, and the calcium carbonate raw materials are at least one of calcite, limestone, marble and oyster shells.
7. The medium element water-insoluble solid fertilizer according to claim 1, wherein the preparation of said light magnesium hydroxide comprises: reacting a magnesium chloride raw material with lime milk to generate magnesium hydroxide precipitate, purifying the magnesium hydroxide precipitate to obtain the light magnesium hydroxide with the purity of 99% or more, wherein the magnesium chloride raw material is at least one of bischofite, halogen blocks, halogen sheets, halogen powder, salt lake bittern and brine.
8. The medium element water-insoluble solid fertilizer according to claim 1, wherein said fumed silica is produced by: the halogen silane is hydrolyzed and condensed at high temperature in oxyhydrogen flame to generate silicon dioxide particles, and the silicon dioxide particles are subjected to quenching, aggregation, separation and deacidification processes in sequence to obtain the gas-phase silicon dioxide with the purity of 99 percent or more.
9. A preparation method of a secondary element water-insoluble solid fertilizer is characterized by comprising the following steps:
(1) mixing 40-50 parts of light calcium carbonate, 40-50 parts of light magnesium hydroxide, 5-15 parts of fumed silica and 1-5 parts of a dispersing agent to obtain a first mixture, wherein the purity of the light calcium carbonate is 99% or more, the purity of the light magnesium hydroxide is 99% or more, and the purity of the fumed silica is 99% or more;
(2) crushing the first mixture to 4000-12500 meshes by using a crusher to obtain a medium element water-insoluble solid fertilizer;
the contents of the above substances are all calculated by weight parts.
10. The method for preparing the medium element water-insoluble solid fertilizer according to claim 9, comprising the step of crushing the first mixture and the second mixture to 4000-12500 meshes by using a crusher to obtain the medium element water-insoluble solid fertilizer, wherein the second mixture is at least one selected from the group consisting of 1-4 parts of sulfur, 1-2 parts of citric acid chelate salt, 1-3 parts of polyglutamic acid, 1-2 parts of sugar alcohol, 1-2 parts of trehalamine and 1-2 parts of chitosan oligosaccharide.
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| CN114591481A (en) * | 2022-03-22 | 2022-06-07 | 华北科技学院(中国煤矿安全技术培训中心) | Expandable graphite flame-retardant polyurethane foam and preparation method thereof |
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