CN113817479A - Preparation process of soil conditioner - Google Patents
Preparation process of soil conditioner Download PDFInfo
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- CN113817479A CN113817479A CN202111393222.0A CN202111393222A CN113817479A CN 113817479 A CN113817479 A CN 113817479A CN 202111393222 A CN202111393222 A CN 202111393222A CN 113817479 A CN113817479 A CN 113817479A
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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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- 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
- C09K2107/00—Impermeabilisation
Abstract
The invention provides a preparation process of a soil conditioner, belonging to the field of soil conditioners; comprises the steps of calcium bentonite modification, granulation, material mixing, disintegration, full mixing and activation; modifying the calcium bentonite: adding calcium bentonite into deionized water, stirring for 2-3min, and adding modifier; continuously stirring for 40-45 min; after stirring is stopped, guiding the product into a drying device, and drying until the water content is lower than 9.5%; performing microwave treatment on the dried powder to obtain modified calcium bentonite; introducing the modified calcium-based bentonite into a granulating device, spraying a binder, and granulating; obtaining modified calcium bentonite particles; mixing materials: and fully mixing the materials to obtain a mixture of the conditioner. And then disintegrating, fully mixing and activating to obtain the soil conditioner. The preparation process has the advantages of low residual rate of materials on the inner wall of production equipment, high water absorption expansion multiple and good effect of improving hardened soil.
Description
Technical Field
The invention provides a preparation process of a soil conditioner, and belongs to the field of soil conditioners.
Background
Soil conditioners are a drug used to condition elements of soil. Soil conditioners are directed to soils that are subject to nutrient loss due to overuse or contamination of the soil. The soil conditioner is pollution-free and nuisanceless and is used for agriculture. The soil hardening and loosening agent can break soil hardening, loosen soil, improve soil air permeability, reduce soil heavy metal pollution, promote soil microbial activity, enhance soil fertilizer water permeability, improve soil, control desert, preserve water and resist drought, enhance crop disease resistance, improve crop yield, improve agricultural product quality, recover crop original ecology and the like, greatly improve tree planting survival rate and agricultural product yield, improve agricultural and forestry product quality, and recover natural landscape of agricultural and forestry products.
The bentonite is a non-metal mineral product with montmorillonite as a main mineral component, the montmorillonite structure is a 2:1 type crystal structure consisting of two silicon-oxygen tetrahedrons and a layer of aluminum-oxygen octahedron, and because certain cations such as Cu, Mg, Na, K and the like exist in a layered structure formed by montmorillonite unit cells, and the cations and the montmorillonite unit cells are unstable in action and easy to exchange with other cations, the bentonite has better ion exchange property.
The bentonite can swell when meeting water, and the natural phenomenon is mainly caused by that the spacing between mineral crystal layers of the bentonite is increased, water molecules enter the mineral crystal layers, and the swelling of the bentonite is caused by the cation exchange effect of the bentonite mineral. The bentonite can be sodium bentonite, calcium bentonite, and natural bleaching earth (acid soil or acid clay). Sodium bentonite and calcium bentonite are commonly used as soil conditioners. Because the swelling times of the sodium bentonite are higher, the sodium bentonite has better fusion with water, and the sodium bentonite is not layered, manufacturers often adopt the sodium bentonite to prepare the soil conditioner. However, sodium bentonite is likely to cause salinization of soil. From the perspective, the calcium bentonite is safer and more effective for improving soil, but the calcium bentonite is difficult to produce due to layering when meeting water and easy to adhere to the inner walls of stirring blades and mixing equipment after absorbing water, and the like, and the residual quantity of the inner walls of the production equipment is large, so that the content of the calcium bentonite in the soil conditioner is difficult to reach the preset content; the repair rate of the equipment is high. Meanwhile, the bentonite in the prepared soil conditioner has poor dispersion uniformity, and the effect of the soil conditioner on improving the soil is influenced.
In summary, the soil conditioner based on calcium bentonite prepared by the production process of the soil conditioner in the prior art has the following technical defects: the soil conditioner with high content of calcium bentonite is produced, the residual amount of materials of internal components and the inner wall of production equipment is high, and the content of the calcium bentonite in the prepared soil conditioner is difficult to reach the preset content; the soil conditioner with high calcium bentonite content is easy to generate layering phenomenon when meeting water, and the fusion degree is poor; the prepared calcium bentonite soil conditioner has low water absorption multiple and unsatisfactory effect of improving hardened soil.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation process of a soil conditioner, which aims to achieve the following aims: the soil conditioner with high calcium bentonite content is produced, the residual rate of materials on the inner wall of production equipment is reduced, the equipment maintenance rate is reduced, and the calcium bentonite content in the soil conditioner reaches more than 99.9% of the preset content; the method improves the fusion degree of the soil conditioner with high calcium bentonite content and water, improves the water absorption expansion times, and ensures that the effect of improving hardened soil is better.
In order to achieve the purpose of the invention, the following technical scheme is adopted:
the invention provides a preparation process of a soil conditioner, which comprises the following process steps:
step 1, modifying calcium bentonite
Adding calcium bentonite into deionized water, wherein the mass ratio of the calcium bentonite to the deionized water is 1: 5-6. Starting stirring at the stirring speed of 300-; the addition amount of the modifier is 22-23% of the mass of the calcium bentonite. Adding modifier, and stirring for 40-45 min. After the stirring is stopped, the product is led into a drying device, dried at the temperature of 120-135 ℃ until the water content is lower than 9.5 percent, and dried to obtain powder. And introducing the dried powder into a microwave treatment device, wherein the microwave frequency is 700MHz-800MHz, and the microwave treatment is carried out for 60-80s, so as to obtain the modified calcium bentonite.
The modifier is prepared from echinacoside, nicotinamide and ferrous sulfate according to the weight ratio of 4-4.5: 1.5-2: 7-8 by mass ratio.
Step 2, granulation
Introducing the modified calcium-based bentonite into a granulating device, spraying a binder, and granulating; the granulation temperature is 45-48 ℃, and the spraying amount of the binder is2.7-2.9% of the modified calcium bentonite; and granulating to obtain spherical particles with the diameter of 5-7mm, namely modified calcium bentonite particles. The spherical particles do not crack or crush when being vibrated at the temperature of less than 45 ℃, and the crushing strength of the particles reaches 11-15N/mm2. The binder is cyclodextrin, glycerol and water, and the weight ratio of cyclodextrin to glycerol to water is 0.8-1: 1.2-1.5: 19-20, and mixing.
Step 3, mixing materials
The soil conditioner comprises the following raw material components in parts by weight:
40-50 parts of modified calcium bentonite particles, 10-15 parts of black humic acid, 5-7 parts of ferrous sulfate, 10-15 parts of potassium feldspar powder and 8-11 parts of diatomite.
Accurately weighing the raw materials according to the formula of the soil conditioner for later use.
Weighing the raw materials of the soil conditioner according to the formula proportion, introducing the raw materials into a mixing tank, and stirring for 25-30min at the temperature of 20-30 ℃, wherein the stirring speed is 80-100 r/min; fully mixing the materials to obtain a mixture of the conditioner.
Step 4, disintegrating and fully mixing
Introducing the mixture of the conditioner into a mixing tank with a heating device and a spraying device, starting heating, starting stirring after the temperature reaches 55 ℃, wherein the stirring speed is 200-; after stirring for 10-15 minutes, regulating the stirring speed to 350-380 r/min, simultaneously starting a spraying device, and uniformly spraying water while stirring, wherein the total mass of the sprayed water is 1-2% of the mass of the conditioner mixture; continuously stirring for 20-25min, standing for 2-5min, and discharging to obtain the conditioner blending material.
Step 5, activation
Introducing the uniformly mixed conditioner material into a high-temperature activation furnace, controlling the temperature in the furnace to be 580-600 ℃, and controlling the high-temperature activation time to be 60-80 s; and (4) leading out the activated material, and standing for 1.5-2h to obtain the soil conditioner.
The soil conditioner prepared by the invention achieves the following beneficial effects:
(1) by adopting the process for preparing the soil conditioner, the soil conditioner based on the calcium bentonite is prepared, the content of the calcium bentonite reaches more than 40 percent (mass percentage content), the residue of the bentonite in a mixing device such as a stirring device is lower than 0.1 percent, and the bentonite in the prepared soil conditioner has high dispersion uniformity. The preparation process greatly reduces the residual quantity of materials in the mixing device in the mixing procedure of the soil conditioner, thereby greatly reducing the fault occurrence rate and the overhaul rate of the mixing device and obviously prolonging the service life of equipment.
(2) The soil conditioner of the invention, through specific modification and processing technology, under the condition of keeping adopting calcium bentonite, not adding sodium bentonite, also not modifying calcium bentonite ion into sodium bentonite; under the condition that the content of the calcium-based bentonite reaches more than 40 percent (mass percentage content), the bentonite is not separated out, is not layered and is pasty when meeting water.
(3) The soil conditioner provided by the invention has the water absorption expansion multiple of 22-25 times through specific modification and processing technologies, and can effectively improve the water absorption rate and porosity of hardened soil.
Detailed Description
Example 1 preparation Process of a soil conditioner
The method comprises the following process steps:
step 1, modifying calcium bentonite
Adding calcium bentonite into deionized water, wherein the mass ratio of the calcium bentonite to the deionized water is 1:5. Starting stirring, wherein the stirring speed is 300 r/min, and adding the modifier after stirring for 2 min; the addition amount of the modifier is 22 percent of the mass of the calcium bentonite. After the modifier was added, stirring was continued for another 40 min. And after stirring is stopped, introducing the product into a drying device, drying at 120 ℃ until the water content is 9.5%, and drying to obtain powder. And introducing the dried powder into a microwave treatment device, wherein the adopted microwave frequency is 700MHz, and the microwave treatment is carried out for 80s, so as to obtain the modified calcium bentonite.
The modifier is prepared from echinacoside, nicotinamide and ferrous sulfate according to a weight ratio of 4: 2: 7 in a mass ratio.
Step 2, granulation
Introducing the modified calcium bentonite into a granulating device, spraying a binder, and carrying outGranulating; the granulation temperature is 45 ℃, and the spraying amount of the binder is 2.7 percent of the mass of the modified calcium bentonite; and (3) obtaining spherical particles with the diameter of 5mm after granulation, namely the modified calcium bentonite particles. The spherical particles do not crack or crush when being vibrated at the temperature of less than 45 ℃, and the crushing strength of the particles reaches 11N/mm2. The binder is a mixed solution prepared by mixing cyclodextrin, glycerol and water according to the mass ratio of 1:1.5: 20.
Step 3, mixing materials
The soil conditioner comprises the following raw material components in parts by weight:
40 parts of modified calcium-based bentonite particles, 15 parts of black humic acid, 7 parts of ferrous sulfate, 10 parts of potassium feldspar powder and 8 parts of diatomite.
Accurately weighing the raw materials according to the formula of the soil conditioner for later use.
Weighing the raw materials of the soil conditioner according to the formula proportion, introducing the raw materials into a mixing tank, and stirring the raw materials at the temperature of 20 ℃ for 25min at the stirring speed of 80 r/min; fully mixing the materials to obtain a mixture of the conditioner.
Step 4, disintegrating and fully mixing
Introducing the mixture of the conditioner into a mixing tank with a heating device and a spraying device, starting heating, starting stirring after the temperature reaches 55 ℃, wherein the stirring speed is 200 revolutions per minute; after stirring for 10 minutes, regulating the stirring speed to 350 r/min, simultaneously starting a spraying device, and uniformly spraying water while stirring, wherein the total mass of the sprayed water is 1% of the mass of the conditioner mixture; and (3) continuously stirring for 20min, standing for 2min, and discharging to obtain the conditioner uniformly-mixed material.
Step 5, activation
Introducing the uniformly mixed conditioner material into a high-temperature activation furnace, wherein the temperature in the furnace is 580 ℃, and the high-temperature activation time is controlled to be 60 s; and (5) leading out the activated material, and standing for 1.5h to obtain the soil conditioner.
In the soil conditioner based on calcium bentonite prepared in the embodiment, the content of calcium bentonite reaches 50% (mass percentage content), the residual amount of bentonite in a mixing device such as a stirring device is only 0.08%, and the bentonite in the prepared soil conditioner is uniformly dispersed; the prepared soil conditioner is mixed with water according to the mass ratio of 1:5, and the mixture is not layered and pasty, and bentonite is not separated out. The prepared soil conditioner has the water absorption expansion multiple of 23 times, and can effectively improve the water absorption rate and the porosity of hardened soil.
Example 2 preparation Process of soil conditioner
The method comprises the following process steps:
step 1, modifying calcium bentonite
Adding calcium bentonite into deionized water, wherein the mass ratio of the calcium bentonite to the deionized water is 1: 6. Starting stirring, wherein the stirring speed is 350 r/min, and adding a modifier after stirring for 3 min; the addition amount of the modifier is 23 percent of the mass of the calcium bentonite. After the modifier was added, stirring was continued for another 45 min. And after stirring is stopped, introducing the product into a drying device, drying at 135 ℃ until the water content is 9.2%, and drying to obtain powder. And (3) introducing the dried powder into a microwave treatment device, and performing microwave treatment for 60s at the microwave frequency of 800MHz to obtain the modified calcium bentonite.
The modifier is prepared from echinacoside, nicotinamide and ferrous sulfate according to the weight ratio of 4.5: 2: 8 by mass ratio.
Step 2, granulation
Introducing the modified calcium-based bentonite into a granulating device, spraying a binder, and granulating; the granulation temperature is 48 ℃, and the spraying amount of the binder is 2.9 percent of the mass of the modified calcium bentonite; and (3) obtaining spherical particles with the diameter of 7mm after granulation, namely the modified calcium bentonite particles. The spherical particles do not crack or crush when being vibrated at the temperature of less than 45 ℃, and the crushing strength of the particles reaches 15N/mm2. The binder is a mixed solution prepared by mixing cyclodextrin, glycerol and water according to a mass ratio of 0.8:1.2: 19.
Step 3, mixing materials
The soil conditioner comprises the following raw material components in parts by weight:
50 parts of modified calcium-based bentonite particles, 10 parts of black humic acid, 5 parts of ferrous sulfate, 15 parts of potassium feldspar powder and 11 parts of diatomite.
Accurately weighing the raw materials according to the formula of the soil conditioner for later use.
Weighing the raw materials of the soil conditioner according to the formula proportion, introducing the raw materials into a mixing tank, and stirring for 30min at the temperature of 30 ℃, wherein the stirring speed is 100 revolutions per minute; fully mixing the materials to obtain a mixture of the conditioner.
Step 4, disintegrating and fully mixing
Introducing the mixture of the conditioner into a mixing tank with a heating device and a spraying device, starting heating, starting stirring after the temperature reaches 55 ℃, wherein the stirring speed is 200 revolutions per minute; after stirring for 12 minutes, regulating the stirring speed to 350 r/min, simultaneously starting a spraying device, and uniformly spraying water while stirring, wherein the total mass of the sprayed water is 1.2% of the mass of the conditioner mixture; continuously stirring for 25min, standing for 5min, and discharging to obtain the conditioner blending material.
Step 5, activation
Introducing the uniformly mixed conditioner material into a high-temperature activation furnace, wherein the temperature in the furnace is 600 ℃, and the high-temperature activation time is controlled to be 80 s; and (4) leading out the activated material, and standing for 2 hours to obtain the soil conditioner.
In the soil conditioner based on calcium bentonite prepared in the embodiment, the content of calcium bentonite reaches 54.9% (mass percentage content), the residual amount of bentonite in a mixing device such as a stirring device is only 0.06%, and the bentonite in the prepared soil conditioner is uniformly dispersed; the prepared soil conditioner is mixed with water according to the mass ratio of 1:5, and the mixture is not layered and pasty, and bentonite is not separated out. The prepared soil conditioner has the water absorption expansion multiple of 25 times, and can effectively improve the water absorption rate and the porosity of hardened soil.
Example 3 preparation Process of soil conditioner
The method comprises the following process steps:
step 1, modifying calcium bentonite
Adding calcium bentonite into deionized water, wherein the mass ratio of the calcium bentonite to the deionized water is 1: 5.5. Starting stirring, wherein the stirring speed is 330 revolutions per minute, and adding the modifier after stirring for 2.5 minutes; the addition amount of the modifier is 22.5 percent of the mass of the calcium bentonite. After the modifier was added, stirring was continued for another 43 min. And after stopping stirring, introducing the product into a drying device, drying at 128 ℃ until the water content is 8.5%, and drying to obtain powder. And (3) introducing the dried powder into a microwave treatment device, wherein the adopted microwave frequency is 760MHz, and the microwave treatment is carried out for 70s, so as to obtain the modified calcium bentonite.
The modifier is prepared from echinacoside, nicotinamide and ferrous sulfate according to the weight ratio of 4.5: 2: 7.5 by mass ratio.
Step 2, granulation
Introducing the modified calcium-based bentonite into a granulating device, spraying a binder, and granulating; the granulation temperature is 47 ℃, and the spraying amount of the binder is 2.8 percent of the mass of the modified calcium bentonite; and (3) obtaining spherical particles with the diameter of 6mm after granulation, namely the modified calcium bentonite particles. The spherical particles do not crack or crush when being vibrated at the temperature of less than 45 ℃, and the crushing strength of the particles reaches 14N/mm2. The binder is a mixed solution prepared by mixing cyclodextrin, glycerol and water according to the mass ratio of 1:1.2: 19.
Step 3, mixing materials
The soil conditioner comprises the following raw material components in parts by weight:
48 parts of modified calcium-based bentonite particles, 13 parts of black humic acid, 6 parts of ferrous sulfate, 12 parts of potassium feldspar powder and 9 parts of diatomite.
Accurately weighing the raw materials according to the formula of the soil conditioner for later use.
Weighing the raw materials of the soil conditioner according to the formula proportion, introducing the raw materials into a mixing tank, and stirring at the temperature of 26 ℃ for 27min at the stirring speed of 90 revolutions per minute; fully mixing the materials to obtain a mixture of the conditioner.
Step 4, disintegrating and fully mixing
Introducing the mixture of the conditioner into a mixing tank with a heating device and a spraying device, starting heating, starting stirring after the temperature reaches 55 ℃, wherein the stirring speed is 210 r/min; after stirring for 15 minutes, adjusting the stirring speed to 360 revolutions per minute, simultaneously starting a spraying device, and uniformly spraying water while stirring, wherein the total mass of the sprayed water is 2 percent of the mass of the conditioner mixture; and continuously stirring for 24min, standing for 4min, and discharging to obtain the conditioner uniformly-mixed material.
Step 5, activation
Introducing the uniformly mixed conditioner material into a high-temperature activation furnace, wherein the temperature in the furnace is 590 ℃, and the high-temperature activation time is controlled to be 70 s; and (4) leading out the activated material, and standing for 2 hours to obtain the soil conditioner.
In the soil conditioner based on calcium bentonite prepared in the embodiment, the content of calcium bentonite reaches 54.5% (mass percentage content), the residual amount of bentonite in a mixing device such as a stirring device is only 0.05%, and the bentonite in the prepared soil conditioner is uniformly dispersed; the prepared soil conditioner is mixed with water according to the mass ratio of 1:5, and the mixture is not layered and pasty, and bentonite is not separated out. The prepared soil conditioner has the water absorption expansion multiple of 25 times, and can effectively improve the water absorption rate and the porosity of hardened soil.
Except for special description, the proportions are mass ratios, and the percentages are mass percentages.
It is clear that many variants are possible within the inventive idea, and that any changes made within the inventive idea shall be deemed to fall within the scope of protection of the invention.
Claims (5)
1. A preparation process of a soil conditioner is characterized by comprising the following steps: comprises the steps of calcium bentonite modification, granulation, material mixing, disintegration, full mixing and activation; modifying the calcium bentonite: adding calcium bentonite into deionized water, stirring for 2-3min, and adding modifier; adding modifier, and stirring for 40-45 min; after the stirring is stopped, the product is led into a drying device and dried under the conditions of 120-135 ℃ until the water content is lower than 9.5 percent to obtain powder; performing microwave treatment on the powder to obtain modified calcium bentonite; the mass ratio of the calcium bentonite to the deionized water is 1: 5-6; the addition amount of the modifier is 22-23% of the mass of the calcium bentonite; the modifier is prepared from echinacoside, nicotinamide and ferrous sulfate according to the weight ratio of 4-4.5: 1.5-2: 7-8 by mass ratio; the microwave treatment comprises the following steps: the adopted microwave frequency is 700MHz-800MHz, and the microwave treatment is carried out for 60-80 s;
and (3) granulating: introducing the modified calcium-based bentonite into a granulating device, spraying a binder, and granulating at the granulating temperature of 45-48 ℃; obtaining modified calcium bentonite particles; the spraying amount of the binder is 2.7-2.9% of the mass of the modified calcium bentonite; the binder is cyclodextrin, glycerol and water, and the weight ratio of cyclodextrin to glycerol to water is 0.8-1: 1.2-1.5: 19-20 parts by mass of a mixed solution;
mixing materials: fully mixing the materials to obtain a conditioner mixture; mixing materials: the adopted soil conditioner formula comprises the following raw material components in parts by weight: 40-50 parts of modified calcium bentonite particles, 10-15 parts of black humic acid, 5-7 parts of ferrous sulfate, 10-15 parts of potassium feldspar powder and 8-11 parts of diatomite.
2. The process for preparing a soil conditioner according to claim 1, wherein:
and (3) granulating: and granulating to obtain spherical particles with the diameter of 5-7 mm.
3. The process for preparing a soil conditioner according to claim 1, wherein: mixing materials: weighing the raw materials of the soil conditioner according to the formula proportion, introducing the raw materials into a mixing tank, and stirring for 25-30min at the temperature of 20-30 ℃, wherein the stirring speed is 80-100 r/min.
4. The process for preparing a soil conditioner according to claim 1, wherein: and (3) disintegrating and fully mixing: introducing the mixture of the conditioner into a mixing tank with a heating device and a spraying device, starting heating, starting stirring after the temperature reaches 55 ℃, wherein the stirring speed is 200-; after stirring for 10-15 minutes, regulating the stirring speed to 350-380 r/min, simultaneously starting a spraying device, and uniformly spraying water while stirring, wherein the total mass of the sprayed water is 1-2% of the mass of the conditioner mixture; continuously stirring for 20-25min, standing for 2-5min, and discharging to obtain the conditioner blending material.
5. The process for preparing a soil conditioner according to claim 1, wherein: the activation: and (3) introducing the uniformly mixed conditioner material prepared in the disintegration and sufficient uniformly mixing steps into a high-temperature activation furnace, wherein the temperature in the furnace is 580-600 ℃, and the high-temperature activation time is controlled to be 60-80 s.
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| WO2010001184A1 (en) * | 2008-07-02 | 2010-01-07 | Novatech D.O.O. | Formulation based on micronized natural calcite mineral and micronized zeolite as an enhanced plant booster and mineral fertilizer |
| CN101693540A (en) * | 2009-10-19 | 2010-04-14 | 中国地质大学（武汉） | Method for preparing modified bentonite flocculating agent |
| CN101962555A (en) * | 2009-07-23 | 2011-02-02 | 中国科学院兰州化学物理研究所 | Multi-functional salinization soil improved material |
| CN106755982A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | A kind of bentonite distribution and device |
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2021
- 2021-11-23 CN CN202111393222.0A patent/CN113817479A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010001184A1 (en) * | 2008-07-02 | 2010-01-07 | Novatech D.O.O. | Formulation based on micronized natural calcite mineral and micronized zeolite as an enhanced plant booster and mineral fertilizer |
| CN101962555A (en) * | 2009-07-23 | 2011-02-02 | 中国科学院兰州化学物理研究所 | Multi-functional salinization soil improved material |
| CN101693540A (en) * | 2009-10-19 | 2010-04-14 | 中国地质大学（武汉） | Method for preparing modified bentonite flocculating agent |
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