CN112919972A - Alkaline cadmium contaminated soil remediation fertilizer and preparation method thereof - Google Patents
Alkaline cadmium contaminated soil remediation fertilizer and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- 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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- 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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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Abstract
The invention discloses an alkaline cadmium polluted soil remediation fertilizer and a preparation method thereof, wherein the alkaline cadmium polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 28-36 parts of modified phosphogypsum, 15-21 parts of urea, 12-18 parts of kaolin, 5-9 parts of modified polyferric sulfate, 5-8 parts of vermiculite, 3-6 parts of calcium phosphate, 3-5 parts of montmorillonite, 2-4 parts of calcium oxide, 1-2 parts of sodium alginate, 0.8-1.5 parts of beta-cyclodextrin, 0.6-1 part of sodium carboxymethylcellulose, 0.6-1 part of sulfur and 0.2-0.6 part of citric acid. The alkaline cadmium-polluted soil remediation fertilizer can effectively reduce the pH value of alkaline soil, so that the fertilizer has a good remediation effect, and also has a good remediation effect on the soil polluted by metal cadmium; the modified phosphogypsum and the modified polyferric sulfate prepared by the method can effectively reduce the pH value of alkaline soil, thereby completing the restoration of the alkaline soil and effectively restoring the soil polluted by cadmium metal.
Description
Technical Field
The invention relates to the technical field of fertilizers, in particular to a fertilizer for repairing soil polluted by alkaline cadmium and a preparation method thereof.
Background
The phosphogypsum is a byproduct generated in the process of producing phosphoric acid by a wet method, 4-5 t of phosphogypsum is produced by each 1t of phosphoric acid (calculated as P2O 5), the color of the phosphogypsum is grey white or grey black, and the main component is CaSO4·2H2O, the content of which is higher than that of natural gypsum, but the phosphogypsum cannot be directly utilized due to the fact that the phosphogypsum contains a plurality of harmful impurities such as soluble phosphorus, eutectic phosphorus, soluble fluorine and organic matters.
The phosphogypsum contains nutrient elements required by the growth of crops such as phosphorus, calcium, magnesium, iron, silicon, sulfur and the like, provides surplus effective phosphorus, effective calcium and nutrient elements required by the growth of the crops, improves the growth environment of the crops and has a certain effect on the yield increase of the crops.
At present, the area of saline-alkali soil in China is about 3600 ten thousand hectares, and alkaline soil is one of main low-yield soil due to various factors such as high pH, poor structural property and permeability, poor soil buffering performance and the like. How to improve alkaline soil is an important problem to be solved urgently.
Disclosure of Invention
The alkaline cadmium-polluted soil remediation fertilizer can effectively reduce the pH value of alkaline soil, so that the alkaline cadmium-polluted soil remediation fertilizer has a good remediation effect, and has a good remediation effect on soil polluted by metal cadmium.
The invention adopts the following technical scheme for solving the technical problems:
an alkaline cadmium contaminated soil remediation fertilizer is prepared from the following raw materials in parts by weight: 28-36 parts of modified phosphogypsum, 15-21 parts of urea, 12-18 parts of kaolin, 5-9 parts of modified polyferric sulfate, 5-8 parts of vermiculite, 3-6 parts of calcium phosphate, 3-5 parts of montmorillonite, 2-4 parts of calcium oxide, 1-2 parts of sodium alginate, 0.8-1.5 parts of beta-cyclodextrin, 0.6-1 part of sodium carboxymethylcellulose, 0.6-1 part of sulfur and 0.2-0.6 part of citric acid.
As a preferable scheme, the alkaline cadmium polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 32-36 parts of modified phosphogypsum, 18-21 parts of urea, 14-18 parts of kaolin, 6-9 parts of modified polyferric sulfate, 6-8 parts of vermiculite, 4-6 parts of calcium phosphate, 3.5-5 parts of montmorillonite, 2-3 parts of calcium oxide, 1-1.8 parts of sodium alginate, 0.8-1.3 parts of beta-cyclodextrin, 0.6-0.9 part of sodium carboxymethylcellulose, 0.6-0.9 part of sulfur and 0.2-0.5 part of citric acid.
As a preferable scheme, the alkaline cadmium polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 35 parts of modified phosphogypsum, 20 parts of urea, 16 parts of kaolin, 8 parts of modified polyferric sulfate, 7.2 parts of vermiculite, 5 parts of calcium phosphate, 4 parts of montmorillonite, 2.5 parts of calcium oxide, 1.4 parts of sodium alginate, 1 part of beta-cyclodextrin, 0.8 part of sodium carboxymethylcellulose, 0.7 part of sulfur and 0.4 part of citric acid.
As a preferred scheme, the preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 160-180 ℃ for 1-5 h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: (0.3-1) uniformly mixing to obtain composite powder;
s3, calcining the composite powder at 400-600 ℃ for 1-5 h to obtain calcined composite powder;
s4, adding 5-10 parts by weight of calcined composite powder into 20-30 parts by weight of mixed acid, performing ultrasonic treatment at 400-800W for 30-60 min, filtering, and drying to obtain the modified phosphogypsum.
Preferably, the mixed acid is prepared from 8-16 parts by weight of tartaric acid, 20-40 parts by weight of oxalic acid and 50-70 parts by weight of concentrated sulfuric acid.
The inventor of the invention surprisingly discovers in a large amount of researches that the alkaline soil pH can be effectively reduced by modifying the phosphogypsum, so that the alkaline soil can be repaired. Through calcining the phosphogypsum, a large amount of soluble phosphorus, soluble fluorine and organic impurities are removed, the phosphogypsum is mixed with humic acid and then treated by mixed acid, so that the surface of the phosphogypsum has a large amount of acid groups and adsorption binding sites, the pH can be obviously reduced, cadmium metal in soil can be adsorbed and complexed, the soil fertility can be increased, the granular structure of the soil can be improved, and the soil permeability can be improved.
Preferably, the mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
As a preferable scheme, the preparation method of the modified polymeric ferric sulfate comprises the following steps:
s11, uniformly mixing 1-2 parts by weight of concentrated sulfuric acid and 15-20 parts by weight of deionized water, heating to 60-70 ℃, adding 20-30 parts by weight of ferrous sulfate heptahydrate and 2-3 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, crushing the potassium feldspar to 200-400 meshes to obtain potassium feldspar powder, and calcining the potassium feldspar powder at 400-600 ℃ for 2-5 hours to obtain calcined potassium feldspar powder;
s13, adding 4-8 parts by weight of calcined potassium feldspar powder and 4-8 parts by weight of silica sol into the polymeric ferric sulfate solution prepared in S11, stirring at 200-500 rpm for 3-8 h, filtering, drying, and grinding into powder of 200-400 meshes to obtain the modified polymeric ferric sulfate.
Preferably, the stirring speed of S12 is 300-600 rpm, and the stirring time is 2-6 h.
Preferably, the silica sol contains 20 to 30 mass% of silica and 0.2 to 0.4 mass% of sodium oxide.
The polymeric ferric sulfate is an acid polymer, the inventor of the application selects from a large amount of raw materials, and surprisingly discovers that the polymeric ferric sulfate can effectively reduce the pH value of alkaline soil, so that the alkaline soil is repaired, the potassium feldspar has large storage capacity and wide distribution, is a network frame structure formed by connecting silicon (aluminum) oxygen tetrahedrons through vertex angles, has unique micropores and microcracks and certain ion exchange characteristics, can effectively provide silicon elements while carrying out auxiliary modification on silica sol, and has good electric neutralization and adsorption bridging effects when the pH value is greater than 7.
The invention also provides a preparation method of the alkaline cadmium polluted soil remediation fertilizer, which comprises the following steps:
adding the modified phosphogypsum, urea, kaolin, modified polyferric sulfate, vermiculite, calcium phosphate, montmorillonite, calcium oxide, sodium alginate, beta-cyclodextrin, sodium carboxymethylcellulose, sulfur and citric acid into a high-speed mixer, uniformly mixing, granulating by using granulation equipment, and drying to obtain the alkaline cadmium-polluted soil remediation fertilizer.
The invention has the beneficial effects that: (1) the alkaline cadmium-polluted soil remediation fertilizer can effectively reduce the pH value of alkaline soil, so that the fertilizer has a good remediation effect, has a good remediation effect on the soil polluted by metal cadmium, and is a soil remediation fertilizer which can reduce the pH value and increase the fertility; (2) the modified phosphogypsum and the modified polyferric sulfate prepared by the method can effectively reduce the pH value of alkaline soil, thereby completing the restoration of the alkaline soil and effectively restoring the soil polluted by cadmium metal; (3) the phosphogypsum is modified, so that the pH value of alkaline soil can be effectively reduced, and the restoration is carried out. Through calcining the phosphogypsum, a large amount of soluble phosphorus, soluble fluorine and organic impurities are removed, the phosphogypsum is mixed with humic acid and then treated by mixed acid, so that the surface of the phosphogypsum has a large amount of acid groups and adsorption binding sites, the pH can be obviously reduced, cadmium metal in soil can be adsorbed and complexed, the soil fertility can be increased, the granular structure of the soil can be improved, and the soil permeability can be improved. The use of the phosphogypsum can relieve the accumulation of a large amount of phosphogypsum and reduce the pollution of the phosphogypsum to the environment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the parts are all parts by weight unless otherwise specified.
Example 1
The alkaline cadmium-polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 35 parts of modified phosphogypsum, 20 parts of urea, 16 parts of kaolin, 8 parts of modified polyferric sulfate, 7.2 parts of vermiculite, 5 parts of calcium phosphate, 4 parts of montmorillonite, 2.5 parts of calcium oxide, 1.4 parts of sodium alginate, 1 part of beta-cyclodextrin, 0.8 part of sodium carboxymethylcellulose, 0.7 part of sulfur and 0.4 part of citric acid.
The preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 175 ℃ for 3h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: 0.5, mixing uniformly to obtain composite powder;
s3, calcining the composite powder at 500 ℃ for 3h to obtain calcined composite powder;
s4, adding 8 parts by weight of calcined composite powder into 22 parts by weight of mixed acid, carrying out 400W ultrasonic treatment for 40min, filtering and drying to obtain the modified phosphogypsum.
The mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
The preparation method of the modified polyferric sulfate comprises the following steps:
s11, uniformly mixing 1.4 parts by weight of concentrated sulfuric acid and 16 parts by weight of deionized water, heating to 62 ℃, adding 27 parts by weight of ferrous sulfate heptahydrate and 2.8 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, crushing the potassium feldspar powder to 300 meshes to obtain potassium feldspar powder, and calcining the potassium feldspar powder at 500 ℃ for 3 hours to obtain calcined potassium feldspar powder;
and S13, adding 6 parts by weight of calcined potassium feldspar powder and 5 parts by weight of silica sol into the polymeric ferric sulfate solution prepared in the S11, stirring at the rotating speed of 400rpm for 4 hours, filtering, drying, and grinding into powder of 300 meshes to obtain the modified polymeric ferric sulfate.
The mass content of silicon dioxide in the silica sol is 28%, and the mass content of sodium oxide in the silica sol is 0.3%.
The invention also provides a preparation method of the alkaline cadmium polluted soil remediation fertilizer, which comprises the following steps:
adding the modified phosphogypsum, urea, kaolin, modified polyferric sulfate, vermiculite, calcium phosphate, montmorillonite, calcium oxide, sodium alginate, beta-cyclodextrin, sodium carboxymethylcellulose, sulfur and citric acid into a high-speed mixer, uniformly mixing, granulating by using granulation equipment, and drying to obtain the alkaline cadmium-polluted soil remediation fertilizer.
Example 2
The alkaline cadmium-polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 28 parts of modified phosphogypsum, 18 parts of urea, 16 parts of kaolin, 5 parts of modified polyferric sulfate, 5 parts of vermiculite, 3 parts of calcium phosphate, 3 parts of montmorillonite, 2 parts of calcium oxide, 1 part of sodium alginate, 0.8 part of beta-cyclodextrin, 0.6 part of sodium carboxymethylcellulose, 0.6 part of sulfur and 0.2 part of citric acid.
The preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 175 ℃ for 3h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: 0.5, mixing uniformly to obtain composite powder;
s3, calcining the composite powder at 500 ℃ for 3h to obtain calcined composite powder;
s4, adding 8 parts by weight of calcined composite powder into 22 parts by weight of mixed acid, carrying out 400W ultrasonic treatment for 40min, filtering and drying to obtain the modified phosphogypsum.
The mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
The preparation method of the modified polyferric sulfate comprises the following steps:
s11, uniformly mixing 1.4 parts by weight of concentrated sulfuric acid and 16 parts by weight of deionized water, heating to 62 ℃, adding 27 parts by weight of ferrous sulfate heptahydrate and 2.8 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, crushing the potassium feldspar powder to 300 meshes to obtain potassium feldspar powder, and calcining the potassium feldspar powder at 500 ℃ for 3 hours to obtain calcined potassium feldspar powder;
and S13, adding 6 parts by weight of calcined potassium feldspar powder and 5 parts by weight of silica sol into the polymeric ferric sulfate solution prepared in the S11, stirring at the rotating speed of 400rpm for 4 hours, filtering, drying, and grinding into powder of 300 meshes to obtain the modified polymeric ferric sulfate.
The mass content of silicon dioxide in the silica sol is 28%, and the mass content of sodium oxide in the silica sol is 0.3%.
The invention also provides a preparation method of the alkaline cadmium polluted soil remediation fertilizer, which comprises the following steps:
adding the modified phosphogypsum, urea, kaolin, modified polyferric sulfate, vermiculite, calcium phosphate, montmorillonite, calcium oxide, sodium alginate, beta-cyclodextrin, sodium carboxymethylcellulose, sulfur and citric acid into a high-speed mixer, uniformly mixing, granulating by using granulation equipment, and drying to obtain the alkaline cadmium-polluted soil remediation fertilizer.
Example 3
The alkaline cadmium-polluted soil remediation fertilizer is prepared from the following raw materials in parts by weight: 32 parts of modified phosphogypsum, 21 parts of urea, 18 parts of kaolin, 7 parts of modified polyferric sulfate, 8 parts of vermiculite, 6 parts of calcium phosphate, 5 parts of montmorillonite, 4 parts of calcium oxide, 2 parts of sodium alginate, 1.5 parts of beta-cyclodextrin, 1 part of sodium carboxymethylcellulose, 1 part of sulfur and 0.6 part of citric acid.
The preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 175 ℃ for 3h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: 0.5, mixing uniformly to obtain composite powder;
s3, calcining the composite powder at 500 ℃ for 3h to obtain calcined composite powder;
s4, adding 8 parts by weight of calcined composite powder into 22 parts by weight of mixed acid, carrying out 400W ultrasonic treatment for 40min, filtering and drying to obtain the modified phosphogypsum.
The mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
The preparation method of the modified polyferric sulfate comprises the following steps:
s11, uniformly mixing 1.4 parts by weight of concentrated sulfuric acid and 16 parts by weight of deionized water, heating to 62 ℃, adding 27 parts by weight of ferrous sulfate heptahydrate and 2.8 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, crushing the potassium feldspar powder to 300 meshes to obtain potassium feldspar powder, and calcining the potassium feldspar powder at 500 ℃ for 3 hours to obtain calcined potassium feldspar powder;
and S13, adding 6 parts by weight of calcined potassium feldspar powder and 5 parts by weight of silica sol into the polymeric ferric sulfate solution prepared in the S11, stirring at the rotating speed of 400rpm for 4 hours, filtering, drying, and grinding into powder of 300 meshes to obtain the modified polymeric ferric sulfate.
The mass content of silicon dioxide in the silica sol is 28%, and the mass content of sodium oxide in the silica sol is 0.3%.
The invention also provides a preparation method of the alkaline cadmium polluted soil remediation fertilizer, which comprises the following steps:
adding the modified phosphogypsum, urea, kaolin, modified polyferric sulfate, vermiculite, calcium phosphate, montmorillonite, calcium oxide, sodium alginate, beta-cyclodextrin, sodium carboxymethylcellulose, sulfur and citric acid into a high-speed mixer, uniformly mixing, granulating by using granulation equipment, and drying to obtain the alkaline cadmium-polluted soil remediation fertilizer.
Comparative example 1
Comparative example 1 differs from example 1 in that comparative example 1 replaces the modified phosphogypsum with phosphogypsum, the rest being the same.
Comparative example 2
Comparative example 2 differs from example 1 in that the modified phosphogypsum of comparative example 2 is prepared by a different process to example 1, i.e. in this comparative example no mixed acid treatment is applied, all the other things being equal.
The preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 175 ℃ for 3h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: 0.5, mixing uniformly to obtain composite powder;
s3, calcining the composite powder at 500 ℃ for 3h to obtain the modified phosphogypsum.
Comparative example 3
Comparative example 3 differs from example 1 in that the process for the preparation of modified phosphogypsum described in comparative example 3 differs from example 1, i.e. in this comparative example, phosphogypsum is not complexed with humic acid, but otherwise is the same.
The preparation method of the modified phosphogypsum comprises the following steps:
s1, calcining the phosphogypsum at 175 ℃ for 3h to obtain calcined phosphogypsum;
s2, adding 8 parts by weight of calcined phosphogypsum into 22 parts by weight of mixed acid, carrying out 400W ultrasonic treatment for 40min, filtering and drying to obtain the modified phosphogypsum.
The mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
Comparative example 4
Comparative example 4 differs from example 1 in that comparative example 4 uses polymeric ferric sulphate instead of modified polymeric ferric sulphate, all other things being equal.
The preparation method of the polymeric ferric sulfate comprises the following steps:
s11, uniformly mixing 1.4 parts by weight of concentrated sulfuric acid and 16 parts by weight of deionized water, heating to 62 ℃, adding 27 parts by weight of ferrous sulfate heptahydrate and 2.8 parts by weight of potassium chlorate, stirring, cooling to room temperature to obtain a polymeric ferric sulfate solution, filtering, and drying to obtain the polymeric ferric sulfate.
Comparative example 5
Comparative example 5 is different from example 1 in that comparative example 5 shows a method of preparing modified polymeric ferric sulfate different from example 1, and the other steps are the same.
The preparation method of the modified polyferric sulfate comprises the following steps:
s11, uniformly mixing 1.4 parts by weight of concentrated sulfuric acid and 16 parts by weight of deionized water, heating to 62 ℃, adding 27 parts by weight of ferrous sulfate heptahydrate and 2.8 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, adding 6 parts by weight of attapulgite into the polymeric ferric sulfate solution prepared in the S11, stirring for 4 hours at the rotating speed of 400rpm, filtering, drying, and grinding into 300-mesh powder to obtain the modified polymeric ferric sulfate.
To further demonstrate the effect of the present invention, the following test methods were provided:
dividing farmland with the same cadmium pollution degree and pH of 9.72 into 24 equal parts, each part is 1m33 parts of the fertilizer are divided into one group, the group is divided into 8 groups, and the fertilizer for restoring the soil polluted by the alkaline cadmium, disclosed by the embodiments 1-3 and the comparative examples 1-5, is applied to each group according to the proportion of 4.5Kg of cubic meter. Spraying appropriate amount of water every day to achieve the purpose of moistening. After 28 days, samples were taken and tested, and the pH and cadmium content were calculated, the results of which are shown in Table 1.
TABLE 1 test results
As can be seen from Table 1, the alkaline cadmium-polluted soil remediation fertilizer can effectively remediate alkaline and cadmium metal-polluted soil.
Compared with the examples 1 to 3, the proportion of the soil remediation fertilizer with different proportions can influence the remediation effect on the alkaline and cadmium-polluted soil, wherein the example 1 is the optimal proportion.
Compared with the examples 1-3, the phosphogypsum is modified, so that the repairing effect of the phosphogypsum on alkaline and cadmium-polluted soil is obviously improved, and the repairing effect of different phosphogypsum modifying methods on alkaline and cadmium-polluted soil can be influenced.
Compared with the comparative examples 4 and 5, the method for modifying polymeric ferric sulfate provided by the invention has the advantages that the remediation effect of the polymeric ferric sulfate on the alkaline and cadmium polluted soil is obviously improved by modifying the polymeric ferric sulfate, and in the modification method in the invention, if potassium feldspar powder and silica sol are replaced by other substances, the modification effect is obviously reduced.
In light of the foregoing description of preferred embodiments according to the invention, it is clear that many changes and modifications can be made by the person skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The alkaline cadmium contaminated soil remediation fertilizer is characterized by being prepared from the following raw materials in parts by weight: 28-36 parts of modified phosphogypsum, 15-21 parts of urea, 12-18 parts of kaolin, 5-9 parts of modified polyferric sulfate, 5-8 parts of vermiculite, 3-6 parts of calcium phosphate, 3-5 parts of montmorillonite, 2-4 parts of calcium oxide, 1-2 parts of sodium alginate, 0.8-1.5 parts of beta-cyclodextrin, 0.6-1 part of sodium carboxymethylcellulose, 0.6-1 part of sulfur and 0.2-0.6 part of citric acid.
2. The alkaline cadmium-contaminated soil remediation fertilizer of claim 1, wherein the alkaline cadmium-contaminated soil remediation fertilizer is prepared from the following raw materials in parts by weight: 32-36 parts of modified phosphogypsum, 18-21 parts of urea, 14-18 parts of kaolin, 6-9 parts of modified polyferric sulfate, 6-8 parts of vermiculite, 4-6 parts of calcium phosphate, 3.5-5 parts of montmorillonite, 2-3 parts of calcium oxide, 1-1.8 parts of sodium alginate, 0.8-1.3 parts of beta-cyclodextrin, 0.6-0.9 part of sodium carboxymethylcellulose, 0.6-0.9 part of sulfur and 0.2-0.5 part of citric acid.
3. The alkaline cadmium-contaminated soil remediation fertilizer of claim 1, wherein the alkaline cadmium-contaminated soil remediation fertilizer is prepared from the following raw materials in parts by weight: 35 parts of modified phosphogypsum, 20 parts of urea, 16 parts of kaolin, 8 parts of modified polyferric sulfate, 7.2 parts of vermiculite, 5 parts of calcium phosphate, 4 parts of montmorillonite, 2.5 parts of calcium oxide, 1.4 parts of sodium alginate, 1 part of beta-cyclodextrin, 0.8 part of sodium carboxymethylcellulose, 0.7 part of sulfur and 0.4 part of citric acid.
4. The alkaline cadmium-contaminated soil remediation fertilizer of claim 1, wherein the preparation method of the modified phosphogypsum is as follows:
s1, calcining the phosphogypsum at 160-180 ℃ for 1-5 h to obtain calcined phosphogypsum;
s2, mixing calcined phosphogypsum and humic acid according to the weight ratio of 1: (0.3-1) uniformly mixing to obtain composite powder;
s3, calcining the composite powder at 400-600 ℃ for 1-5 h to obtain calcined composite powder;
s4, adding 5-10 parts by weight of calcined composite powder into 20-30 parts by weight of mixed acid, performing ultrasonic treatment at 400-800W for 30-60 min, filtering, and drying to obtain the modified phosphogypsum.
5. The fertilizer for repairing soil polluted by alkaline cadmium as claimed in claim 4, wherein the mixed acid is prepared from 8-16 parts by weight of tartaric acid, 20-40 parts by weight of oxalic acid and 50-70 parts by weight of concentrated sulfuric acid.
6. The fertilizer for repairing soil polluted by alkaline cadmium as claimed in claim 4, wherein the mixed acid is prepared from 12 parts by weight of tartaric acid, 28 parts by weight of oxalic acid and 60 parts by weight of concentrated sulfuric acid.
7. The alkaline cadmium-contaminated soil remediation fertilizer of claim 1, wherein the modified polymeric ferric sulfate is prepared by a method comprising:
s11, uniformly mixing 1-2 parts by weight of concentrated sulfuric acid and 15-20 parts by weight of deionized water, heating to 60-70 ℃, adding 20-30 parts by weight of ferrous sulfate heptahydrate and 2-3 parts by weight of potassium chlorate, stirring, and cooling to room temperature to obtain a polymeric ferric sulfate solution;
s12, crushing the potassium feldspar to 200-400 meshes to obtain potassium feldspar powder, and calcining the potassium feldspar powder at 400-600 ℃ for 2-5 hours to obtain calcined potassium feldspar powder;
s13, adding 4-8 parts by weight of calcined potassium feldspar powder and 4-8 parts by weight of silica sol into the polymeric ferric sulfate solution prepared in S11, stirring at 200-500 rpm for 3-8 h, filtering, drying, and grinding into powder of 200-400 meshes to obtain the modified polymeric ferric sulfate.
8. The fertilizer for repairing soil polluted by alkaline cadmium as claimed in claim 7, wherein the stirring speed of S11 is 300-600 rpm, and the stirring time is 2-6 h.
9. The alkaline cadmium-contaminated soil remediation fertilizer as claimed in claim 7, wherein the silica sol contains 20-30% by mass of silica and 0.2-0.4% by mass of sodium oxide.
10. A preparation method of an alkaline cadmium-polluted soil remediation fertilizer, which is used for preparing the alkaline cadmium-polluted soil remediation fertilizer as claimed in any one of claims 1 to 9, and comprises the following steps:
adding the modified phosphogypsum, urea, kaolin, modified polyferric sulfate, vermiculite, calcium phosphate, montmorillonite, calcium oxide, sodium alginate, beta-cyclodextrin, sodium carboxymethylcellulose, sulfur and citric acid into a high-speed mixer, uniformly mixing, granulating by using granulation equipment, and drying to obtain the alkaline cadmium-polluted soil remediation fertilizer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113637486A (en) * | 2021-09-07 | 2021-11-12 | 新洋丰农业科技股份有限公司 | Special soil conditioner for medium and light saline-alkali soil and preparation method thereof |
| CN115213214A (en) * | 2022-05-31 | 2022-10-21 | 江苏隆昌化工有限公司 | Cadmium and mercury reducing material for producing polluted farmland in Yunobile plateau by using phosphogypsum and pyrite as resources |
| CN115463960A (en) * | 2022-07-27 | 2022-12-13 | 江西省三汇科技有限公司 | Farmland is fallen arsenic and is fallen cadmium and heavy metal's processing apparatus |
| CN115213214B (en) * | 2022-05-31 | 2024-05-28 | 江苏隆昌化工有限公司 | Cadmium-reducing and mercury-reducing material for producing polluted farmland of cloud precious plateau by using phosphogypsum and pyrite as resources |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637486A (en) * | 2021-09-07 | 2021-11-12 | 新洋丰农业科技股份有限公司 | Special soil conditioner for medium and light saline-alkali soil and preparation method thereof |
| CN113637486B (en) * | 2021-09-07 | 2022-06-07 | 新洋丰农业科技股份有限公司 | Special soil conditioner for medium and light saline-alkali soil and preparation method thereof |
| CN115213214A (en) * | 2022-05-31 | 2022-10-21 | 江苏隆昌化工有限公司 | Cadmium and mercury reducing material for producing polluted farmland in Yunobile plateau by using phosphogypsum and pyrite as resources |
| CN115213214B (en) * | 2022-05-31 | 2024-05-28 | 江苏隆昌化工有限公司 | Cadmium-reducing and mercury-reducing material for producing polluted farmland of cloud precious plateau by using phosphogypsum and pyrite as resources |
| CN115463960A (en) * | 2022-07-27 | 2022-12-13 | 江西省三汇科技有限公司 | Farmland is fallen arsenic and is fallen cadmium and heavy metal's processing apparatus |
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