CN114736688A - Conditioner for reducing hexavalent chromium in soil and preparation method and preparation device thereof - Google Patents
Conditioner for reducing hexavalent chromium in soil and preparation method and preparation device thereof Download PDFInfo
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- CN114736688A CN114736688A CN202210006209.3A CN202210006209A CN114736688A CN 114736688 A CN114736688 A CN 114736688A CN 202210006209 A CN202210006209 A CN 202210006209A CN 114736688 A CN114736688 A CN 114736688A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
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Abstract
The invention belongs to the field of soil remediation, and particularly relates to a conditioner for reducing hexavalent chromium in soil, which comprises the following materials in parts by weight: 10-15 parts of calcium polysulfide, 5-7 parts of ferrous sulfate heptahydrate, 15-25 parts of corncobs, 10-30 parts of sodium metabisulfite, 2-4 parts of iron powder, 150 parts of bentonite 100-. According to the invention, raw materials such as ferrous sulfate heptahydrate, iron powder and quicklime are added into the formula, hexavalent chromium ions are reduced by the ferrous sulfate heptahydrate and iron ions in the iron powder, the reducibility of the conditioner to hexavalent chromium can be effectively improved, the temperature of soil is increased by the quicklime in water, the reaction rate is accelerated, and a matched preparation method and preparation equipment are designed, so that the process is simple and practical.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a conditioner for reducing hexavalent chromium in soil, and a preparation method and a preparation device thereof.
Background
Soil is an important resource for the natural environment and agriculture of human life, and the global grain, resource and environmental problems are closely related to soil. However, with the continuous acceleration of the industrialization, rural intensification and urbanization processes in China, the polluted soil area is continuously enlarged, the soil pollution problem is increasingly serious, but the conditioner for adjusting hexavalent chromium in the prior art has poor repairing effect, so that the soil cannot be repaired. Accordingly, there is a need for improvements in the art.
Disclosure of Invention
The invention aims to provide a conditioner for reducing hexavalent chromium in soil, a preparation method and a preparation device thereof, and solves the problem that the existing soil remediation agent is poor in effect.
In order to achieve the aim, the invention provides a conditioner for reducing hexavalent chromium in soil, which comprises the following materials in parts by weight: 10-15 parts of calcium polysulfide, 5-7 parts of ferrous sulfate heptahydrate, 15-25 parts of corncobs, 10-30 parts of sodium metabisulfite, 2-4 parts of iron powder, 150 parts of bentonite 100-.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
firstly, preparing specified parts of calcium polysulfide, ferrous sulfate heptahydrate, corncobs, sodium metabisulfite, iron powder, bentonite, montmorillonite and quicklime;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and putting the raw materials into a pre-mixing device for mixing after crushing;
step four, putting the mixed raw materials into a granulator for granulation, cooling the granules, and adding lime powder into the granules after cooling;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Further, the carbonization temperature of the corncobs in the second step is 500-700 ℃, and the carbonization time is 30-45 minutes.
Further, the iron powder is formed by grinding hematite.
Further, the granulating diameter of the granulator in the fourth step is 2-4 mm.
A preparation device of a conditioner for reducing hexavalent chromium in soil, which comprises a base, wherein the upper end of the base is fixedly connected with a hinged frame, the hinged frame is hinged with a hinged ring, the inside of the hinged ring is provided with a drying cylinder through a bearing, a gear disc is fixedly sleeved on the drying cylinder, a speed reducing motor is fixedly connected on the hinge ring, two support rings which are symmetrically distributed are arranged on the outer side of the drying cylinder through a bearing, a telescopic hydraulic cylinder is hinged on the base, the output end of the telescopic hydraulic cylinder is hinged with one of the support rings, a material guide plate is fixedly connected to the drying cylinder, the drying cylinder is fixedly connected with a screen, the drying cylinder is fixedly connected with a drying box, the inside of the drying box is fixedly connected with a fan, the inside fixedly connected with electrothermal tube of stoving case, two symmetric distribution's of fixedly connected with filter screen on the stoving case.
Furthermore, the tail end of an output shaft of the speed reducing motor is fixedly connected with a straight gear, and the straight gear is meshed with the gear disc.
Furthermore, a supporting column is fixedly connected to the base, and the supporting column is in contact with the other supporting ring.
The invention has the beneficial effects that: according to the invention, by adding the raw materials such as the ferrous sulfate heptahydrate, the iron powder and the quicklime in the formula, hexavalent chromium ions can be reduced through the ferrous sulfate heptahydrate and the iron ions in the iron powder, the reducibility of the conditioner to hexavalent chromium can be effectively improved, the temperature of soil can be increased through the quicklime in water, the reaction rate is accelerated, and a matched preparation method and preparation equipment are designed, so that the process is simple and practical.
Drawings
FIG. 1 is a schematic diagram of a conditioner preparation apparatus for reducing hexavalent chromium in soil according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the drying box of FIG. 1 of a conditioner preparation apparatus for reducing hexavalent chromium in soil according to an embodiment of the present invention;
FIG. 3 is an enlarged view of the part A of the structure of the conditioner preparation device for reducing hexavalent chromium in soil according to an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the drying device comprises a base 1, a hinged frame 2, a hinged ring 3, a drying cylinder 4, a gear disc 5, a speed reduction motor 6, a straight gear 7, a support ring 8, a support column 9, a telescopic hydraulic cylinder 10, a material guide plate 11, a screen 12, a drying box 13, a fan 14, an electric heating pipe 15 and a filter screen 16.
Example 1:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 10 parts of calcium polysulfide, 5 parts of ferrous sulfate heptahydrate, 15 parts of corncobs, 10 parts of sodium metabisulfite, 2 parts of iron powder, 100 parts of bentonite, 15 parts of montmorillonite and 30 parts of quick lime.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
firstly, preparing specified parts of calcium polysulfide, ferrous sulfate heptahydrate, corncobs, sodium metabisulfite, iron powder, bentonite, montmorillonite and quicklime;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and putting the raw materials into a pre-mixing device for mixing after crushing;
step four, putting the mixed raw materials into a granulator for granulation, cooling the granules, and adding lime powder into the granules after cooling;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is between 2 and 4 millimeters.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear disc 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
Example 2:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 12.5 parts of calcium polysulfide, 6 parts of ferrous sulfate heptahydrate, 20 parts of corncobs, 20 parts of sodium metabisulfite, 3 parts of iron powder, 125 parts of bentonite, 17.5 parts of montmorillonite and 35 parts of quicklime.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
firstly, preparing specified parts of calcium polysulfide, ferrous sulfate heptahydrate, corncobs, sodium metabisulfite, iron powder, bentonite, montmorillonite and quicklime;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and putting the raw materials into a pre-mixing device for mixing after crushing;
step four, putting the mixed raw materials into a granulator for granulation, cooling the granules, and adding lime powder into the granules after cooling;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is 2-4 mm.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear plate 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
Example 3:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 15 parts of calcium polysulfide, 7 parts of ferrous sulfate heptahydrate, 25 parts of corncobs, 30 parts of sodium metabisulfite, 4 parts of iron powder, 150 parts of bentonite, 120 parts of montmorillonite and 40 parts of quick lime.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
step one, preparing specified parts of calcium polysulfide, ferrous sulfate heptahydrate, corncobs, sodium metabisulfite, iron powder, bentonite, montmorillonite and quicklime;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and putting the raw materials into a pre-mixing device for mixing after crushing;
step four, putting the mixed raw materials into a granulator for granulation, cooling the granules, and adding lime powder into the granules after cooling;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is 2-4 mm.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear disc 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
Comparative example 1:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 10 parts of calcium polysulfide, 15 parts of corncobs, 10 parts of sodium metabisulfite, 100 parts of bentonite and 15 parts of montmorillonite.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
step one, preparing specified parts of calcium polysulfide, corncobs, sodium metabisulfite, bentonite and montmorillonite;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and after crushing, putting the raw materials into a pre-stirring device for mixing;
step four, putting the mixed raw materials into a granulator for granulation, and then cooling the granules;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is 2-4 mm.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear disc 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
Comparative example 2:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 12.5 parts of calcium polysulfide, 17.5 parts of corncob, 20 parts of sodium metabisulfite, 125 parts of bentonite and 17.5 parts of montmorillonite.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
step one, preparing specified parts of calcium polysulfide, corncobs, sodium metabisulfite, bentonite and montmorillonite;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and putting the raw materials into a pre-mixing device for mixing after crushing;
step four, putting the mixed raw materials into a granulator for granulation, and then cooling the granules;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and storing the packaged regulator in a warehouse.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is 2-4 mm.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear disc 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
Comparative example 3:
a conditioner for reducing hexavalent chromium in soil comprises the following materials in parts by weight: 15 parts of calcium polysulfide, 25 parts of corncobs, 30 parts of sodium metabisulfite, 150 parts of bentonite and 20 parts of montmorillonite.
A preparation method of a conditioner for reducing hexavalent chromium in soil comprises the following steps:
step one, preparing specified parts of calcium polysulfide, corncobs, sodium metabisulfite, bentonite and montmorillonite;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and after crushing, putting the raw materials into a pre-stirring device for mixing;
step four, putting the mixed raw materials into a granulator for granulation, and then cooling the granules;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
Wherein: in the second step, the carbonization temperature of the corncobs is 500-700 ℃, and the carbonization time is 30-45 minutes.
Wherein: the iron powder is formed by grinding hematite.
Wherein: the granulating diameter of the granulator in the fourth step is 2-4 mm.
Referring to fig. 1-3, a conditioner preparation apparatus for reducing hexavalent chromium in soil comprises a base 1, an upper end of the base 1 is fixedly connected with a hinged frame 2, the hinged frame 2 is hinged with a hinged ring 3, a drying cylinder 4 is installed inside the hinged ring 3 through a bearing, a gear disc 5 is fixedly sleeved on the drying cylinder 4, a speed reduction motor 6 is fixedly connected with the hinged ring 3, two support rings 8 which are symmetrically distributed are installed on the outer side of the drying cylinder 4 through a bearing, a telescopic hydraulic cylinder 10 is hinged on the base 1, the output end of the telescopic hydraulic cylinder 10 is hinged with one of the support rings 8, a material guide plate 11 is fixedly connected with the drying cylinder 4, a screen 12 is fixedly connected with the drying cylinder 4, a drying box 13 is fixedly connected with the drying box 13, a fan 14 is fixedly connected inside the drying box 13, an electric heating tube 15 is fixedly connected with the drying box 13, and two filter screens 16 which are symmetrically distributed are fixedly connected with the drying box 13.
As shown in fig. 3, a spur gear 7 is fixedly connected to the end of the output shaft of the reduction motor 6, the spur gear 7 is engaged with the gear plate 5, and the reduction motor 6 is 50K60GU-CF, which belongs to the prior art.
As shown in fig. 1, a supporting column 9 is fixedly connected to the base 1, the supporting column 9 contacts with another supporting ring 8, and the supporting column 9 supports the drying cylinder 4.
The specific implementation process of the invention is as follows: when using, put into the inside of drying cylinder 4 with the raw materials, then start gear motor 6, gear motor 6 drives spur gear 7 and rotates, spur gear 7 drives drying cylinder 4 through toothed disc 5 and rotates, drying cylinder 4 starts fan 14 and electrothermal tube 15 when the pivoted, the inside granule of drying cylinder 4 is dried after the air current that fan 14 blew out can pass through electrothermal tube 15's heating, and can turn over the stirring through drying cylinder 4's rotation when drying the raw materials, thereby can make the granule dry more even, and aqueous vapor during the stoving can discharge through screen cloth 12, after the granule is dried and is accomplished, start flexible pneumatic cylinder 10 and jack up drying cylinder 4, can make drying cylinder 4 overturn along articulated frame 2, alright pass through stock guide 11 with drying cylinder 4 and discharge, make the device use more convenient.
The conditioner is produced according to examples 1-3 and comparative examples 1-3 respectively, wherein in comparative examples 1-3, ferrous sulfate heptahydrate, iron powder and quick lime are removed, six groups of conditioners are obtained in examples 1-3 and comparative examples 1-3, then soil culture containers are selected, 50kg of hexavalent chromium-containing soil which is sieved by a 10-mesh sieve is filled in each container, the conditioner is added according to 0.1% of the mass of the soil, and after the conditioner is fully mixed, the soil is submerged by at least 2 cm. Culturing at room temperature for 2 weeks, air drying, dividing each group into two parts, sieving one part with 10 mesh nylon sieve, and measuring pH value; and the other part is ground again and then screened by a nylon sieve of 20 meshes for analyzing the reduction amount of the heavy metal hexavalent chromium and evaluating the passivation effect of each passivator on the heavy metal in the soil. The following results were obtained:
| raw material formula | Hexavalent chromium reduction (mg/kg) | Degree of soil passivation | |
| Example 1 | 10g of calcium polysulfide, 5g of ferrous sulfate heptahydrate, 15g of corncob, 10g of sodium metabisulfite, 2g of iron powder, 100g of bentonite, 15g of montmorillonite and 30g of quick lime | 28.5 | Height of |
| Example 2 | 12.5g of calcium polysulfide, 6g of ferrous sulfate heptahydrate, 17.5g of corncob, 20g of sodium metabisulfite, 3g of iron powder, 125g of bentonite, 17.5g of montmorillonite and 25g of quick lime | 22.4 | High (a) |
| Example 3 | 15g of calcium polysulfide, 7g of ferrous sulfate heptahydrate, 25g of corncobs, 30g of sodium metabisulfite, 4g of iron powder, 150g of bentonite, 20g of montmorillonite and 40g of quick lime | 28.9 | Height of |
| Comparative example 1 | 10g of calcium polysulfide, 15g of corncob, 10g of sodium metabisulfite, 100g of bentonite and 15g of montmorillonite | 2.8 | Is low in |
| Comparative example 2 | 12.5g of calcium polysulfide, 17.5g of corncob, 20g of sodium metabisulfite, 125g of bentonite and 17.5g of montmorillonite | 3.2 | Is low with |
| Comparative example 3 | 15g of calcium polysulfide, 25g of corncob, 30g of sodium metabisulfite, 150g of bentonite and 20g of montmorillonite | 3.9 | Is low in |
Through the above table, it can be seen from examples 1 to 3 and comparative examples 1 to 3 that the conversion rate is replaced by adding raw materials such as ferrous sulfate heptahydrate, iron powder and quicklime, and the purpose design object of the present invention is achieved: the formula design of the invention effectively enhances the reducibility of the conditioner to hexavalent chromium, protects the environment and the like, and increases the reaction rate through quicklime.
It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly in the present invention, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A conditioner for reducing hexavalent chromium in soil is characterized in that: the material comprises the following materials in parts by weight: 10-15 parts of calcium polysulfide, 5-7 parts of ferrous sulfate heptahydrate, 15-25 parts of corncobs, 10-30 parts of sodium metabisulfite, 2-4 parts of iron powder, 150 parts of bentonite 100-.
2. A preparation method of a conditioner for reducing hexavalent chromium in soil is characterized by comprising the following steps: the method comprises the following steps:
firstly, preparing specified parts of calcium polysulfide, ferrous sulfate heptahydrate, corncobs, sodium metabisulfite, iron powder, bentonite, montmorillonite and quicklime;
crushing the corncobs, carbonizing the crushed corncobs, and crushing the corncob carbon after carbonization;
step three, crushing the rest raw materials, and after crushing, putting the raw materials into a pre-stirring device for mixing;
step four, putting the mixed raw materials into a granulator for granulation, cooling the granules, and adding lime powder into the granules after cooling;
and step five, filling the regulator into the packaging bag, and then sealing the packaging bag and putting the packaged regulator into storage.
3. The method of preparing a conditioner for reducing hexavalent chromium in soil according to claim 2, wherein: the carbonization temperature of the corncobs in the second step is 500-700 ℃, and the carbonization time is 30-45 minutes.
4. The conditioner for reducing hexavalent chromium in soil according to claim 1, wherein: the iron powder is formed by grinding hematite.
5. The method of preparing a conditioner for reducing hexavalent chromium in soil according to claim 2, wherein: and the granulating diameter of the granulator in the fourth step is 2-4 mm.
6. The utility model provides a reduce conditioner preparation facilities of hexavalent chromium in soil which characterized in that: the on-line screen storage device comprises a base, the articulated frame of upper end fixedly connected with of base, articulated on the articulated frame have the hinge ring, a stoving section of thick bamboo is installed through the bearing in the inside of hinge ring, fixed cup joint has the toothed disc on the stoving section of thick bamboo, fixedly connected with gear motor on the hinge ring, two symmetric distribution's support ring is installed through the bearing in the outside of a stoving section of thick bamboo, articulated on the base have flexible pneumatic cylinder, flexible pneumatic cylinder's output and one of them the support ring is articulated, fixedly connected with stock guide on the stoving section of thick bamboo, fixedly connected with screen cloth on the stoving section of thick bamboo, fixedly connected with stoving case on the stoving section of thick bamboo, the inside fixedly connected with fan of stoving case, the inside fixedly connected with electrothermal tube of stoving case, the filter screen of two symmetric distribution of fixedly connected with on the stoving case.
7. The apparatus of claim 6 for preparing a conditioner to reduce hexavalent chromium in soil, wherein: the tail end of an output shaft of the speed reducing motor is fixedly connected with a straight gear, and the straight gear is meshed with the gear disc.
8. The conditioner preparation apparatus for reducing hexavalent chromium in soil according to claim 6, wherein: and a support column is fixedly connected to the base and is in contact with the other support ring.
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