CN105985776B - Preparation method of soil conditioner rich in citric acid soluble silicon - Google Patents
Preparation method of soil conditioner rich in citric acid soluble silicon Download PDFInfo
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- CN105985776B CN105985776B CN201510040893.7A CN201510040893A CN105985776B CN 105985776 B CN105985776 B CN 105985776B CN 201510040893 A CN201510040893 A CN 201510040893A CN 105985776 B CN105985776 B CN 105985776B
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Abstract
The invention discloses a preparation method of a citric acid-soluble silicon-rich soil conditioner, which comprises the following steps: 1) synthesizing a silicon dioxide-rich substance and a substance taking calcium oxide as a main component by a hydrothermal method to obtain sodium calcium silicate; 2) decomposing sodium calcium silicate in dilute alkali solution to obtain calcium silicate; 3) and washing and drying the calcium silicate to obtain the soil conditioner rich in citric acid soluble silicon. The content of citrate soluble silicon in the soil conditioner prepared by the invention is more than or equal to 30.0 percent, the effective rate of silicon is more than 90 percent, and the water storage capacity of calcium silicate is more than 17 times of that of soil with the same quality. In addition, the raw material of the invention can be prepared from bulk industrial solid wastes such as fly ash and the like, and can also be prepared from primary resources taking silicon dioxide as a main component, and the source is very wide.
Description
Technical Field
The invention belongs to the field of industrial waste recycling and the field of agriculture, and particularly relates to a preparation method of a soil conditioner rich in citric acid soluble silicon.
Background
Soil conditioners refer to a variety of materials used to maintain or improve plant nutrition and soil physicochemical properties and biological activity. The soil hardening agent can break soil hardening, loosen soil, improve soil air permeability, reduce soil volume weight, promote soil microbial activity and enhance soil fertilizer water permeability; improving soil, controlling desert, preserving water and resisting drought, enhancing the disease resistance of crops, increasing the yield of crops, improving the quality of agricultural products, recovering the original ecology of the crops and the like. Silicon is an important inorganic component in higher plants, exists in almost all plants, has certain special functions on plant bodies, is known as a beneficial element of the plant bodies, and has the following physiological functions: participate in the composition of cell walls, and improve the disease resistance and stress resistance of crops; influence and adjust the photosynthesis and transpiration of plants; promoting plant growth and improving crop yield and quality. When plants absorb silicon, only the silicon which can be dissolved in the acid environment of roots of the plants can be absorbed, and the silicon is called citrate soluble silicon. Besides the beneficial element of silicon, calcium silicate also contains a plurality of major elements, secondary elements and trace elements required by plant growth, such as phosphorus, potassium, calcium, magnesium, sulfur, manganese, iron, chlorine and the like, according to different raw materials. In addition, the porous characteristic of the calcium silicate also enables the calcium silicate to have the effects of soil moisture retention, soil heavy metal ion adsorption, soil volume weight reduction, soil air permeability improvement and the like. Therefore, the application of the soil conditioner calcium silicate is increasingly gaining attention.
The soil conditioner has more preparation methods. The invention discloses a multifunctional soil conditioner and a preparation method thereof, which takes phosphogypsum, fly ash and powdered rock phosphate as raw materials, adopts a mixed stacking and aging method of the phosphogypsum, the fly ash and the powdered rock phosphate to produce the soil conditioner, and the soil conditioner has the functions of water retention, slow release and nitrogen fixation, soil acidity and alkalinity adjustment and the like, but the invention can not fully activate the silicon component in the fly ash and effectively utilize the silicon component, and fluorine in the powdered rock phosphate can flow to the soil, so that the fluorine element can be enriched and the environment can be polluted after long-term use. Chinese patent application CN103771911A discloses a method for producing a secondary element soil conditioner by using industrial calcium silicate board waste, but because the activity of silicon in the waste is poor, the content of citrate-soluble silicon in the waste is lower and is only between 20 and 22 percent. The Chinese patent application CN101450875A introduces a method for preparing multi-element microporous mineral fertilizer from silicate rock by using hydrothermal reaction, and the invention takes the original resources as raw materials, and the activation of silicon in silicate is difficult, and the content of citrate-soluble silicon is not ideal. Chinese patent application CN102559195A discloses a soil heavy metal control conditioner and a production method thereof, which can reduce the heavy metal content of crops, particularly the cadmium content. In addition, the Chinese patent application CN102796527A provides a production method of a soil conditioner containing porous silicon-calcium fertilizer, and the soil conditioner is prepared by taking potassium feldspar, quicklime and a foaming agent as raw materials and adopting a hydrothermal method.
In summary, in the preparation of the prior soil conditioner, the original resources are mostly adopted as raw materials, and the soil conditioner with single or multiple effects is obtained by a hydrothermal reaction or a direct physical mixing and aging mode, so that the content of effective silicon is generally not high.
Disclosure of Invention
The invention aims to provide a preparation method of a soil conditioner rich in citrate soluble silicon, which can greatly improve the citrate soluble silicon content and takes secondary resources as raw materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a citric acid-rich soluble silicon soil conditioner comprises the following steps:
1) synthesizing a silicon dioxide-rich substance and a substance taking calcium oxide as a main component by a hydrothermal method to obtain sodium calcium silicate;
2) decomposing sodium calcium silicate in dilute alkali solution to obtain calcium silicate;
3) and washing and drying the calcium silicate to obtain the soil conditioner rich in citric acid soluble silicon.
Preferably, the silica-rich material is one or more of fly ash, quartz sand, kaolin and bentonite.
Preferably, the substance with calcium oxide as a main component is one or more of calcium oxide, phosphogypsum and desulfurized gypsum.
Preferably, in the step 1), the silicon dioxide-rich material and the material with calcium oxide as the main component are mixed and then react in the NaOH solution with the concentration of 100-600 g/L to prepare the sodium calcium silicate, the reaction temperature is 150-300 ℃, the reaction time is 0.5-5h, and the molar ratio of the calcium oxide to the silicon dioxide is 0.7-1.2.
Further preferably, in the step 1), the concentration of the NaOH solution is 300-500 g/L, the reaction temperature is 200-230 ℃, and the reaction time is 1-2 h.
Preferably, in the step 2), the decomposition reaction is to hydrolyze sodium calcium silicate in 0.1-100 g/L NaOH solution, wherein the hydrolysis reaction temperature is 60-230 ℃, and the reaction time is 0.5-20 h.
Further preferably, the concentration of the NaOH solution is 20-50 g/L, the hydrolysis reaction temperature is 150-170 ℃, and the reaction time is 2-8 h.
Compared with the prior art, the soil conditioner prepared by the invention has the advantages that the content of citrate-soluble silicon in the soil conditioner prepared by the invention is more than or equal to 30.0 percent, the effective rate of silicon is more than 90 percent, and the water storage capacity of calcium silicate is more than 17 times of that of soil with the same mass.
In addition, the raw material of the invention can be prepared from bulk industrial solid wastes such as fly ash and the like, and can also be prepared from primary resources taking silicon dioxide as a main component, and the source is very wide.
Drawings
FIG. 1 is a flow chart of a preparation method of the soil conditioner rich in citric acid soluble silicon.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
According to the mol ratio of calcium oxide to silicon dioxide of 1.2, fly ash and calcium oxide are used as raw materials to react for 5 hours at the temperature of 150 ℃ and the NaOH concentration of 600 g/L to synthesize solid slag with sodium calcium silicate as the main component, wherein the main component is 14.72 percent of Na2O, 29.93% SiO2And 31.8 percent of CaO, mixing the solid slag with dilute alkali liquor with the concentration of NaOH being 0.1 g/L, carrying out dynamic hydrothermal decomposition reaction in a reaction kettle at the reaction temperature of 60 ℃ for 20h, filtering and washing the reacted slurry to obtain calcium silicate, washing and drying the calcium silicate to obtain the soil conditioner, and mixing the soil conditioner with the solid slag and the dilute alkali liquor with the concentration of NaOH being 0.1 g/LThe content of citrate soluble silicon in the conditioner is 31.0 percent, and the water storage capacity of calcium silicate reaches 18 times of that of soil with the same mass.
Example 2
According to the mol ratio of calcium oxide to silicon dioxide of 0.8, fly ash and phosphogypsum are used as raw materials to react for 1 hour at the temperature of 230 ℃ and the NaOH concentration of 300 g/L to synthesize solid slag with sodium calcium silicate as the main component, the main component is 16.20 percent of Na2O, 33.56% SiO2And 32.47% of CaO, mixing the solid slag with dilute alkali liquor with NaOH concentration of 100 g/L, carrying out dynamic hydrothermal decomposition reaction in a reaction kettle, carrying out reaction at 230 ℃ for 0.5h, filtering and washing the reacted slurry to obtain calcium silicate, and washing and drying the calcium silicate to obtain the soil conditioner, wherein the content of citrate-soluble silicon in the soil conditioner is 30.3%, and the water storage capacity of the calcium silicate is 17 times of that of the soil with the same mass.
Example 3
According to the mol ratio of calcium oxide to silicon dioxide of 0.7, quartz sand and desulfurized gypsum are used as raw materials to react for 0.5h at the temperature of 300 ℃ and the NaOH concentration of 100 g/L to synthesize solid slag with sodium calcium silicate as the main component, wherein the main component is 15.08 percent of Na2O, 33.42% SiO2And 33.79% of CaO, mixing the solid slag with dilute alkali liquor with the concentration of NaOH being 50 g/L, carrying out dynamic hydrothermal decomposition reaction in a reaction kettle, carrying out reaction at the temperature of 150 ℃ for 8h, filtering and washing slurry after the reaction to obtain calcium silicate, and washing and drying the calcium silicate to obtain the soil conditioner, wherein the content of citrate-soluble silicon in the soil conditioner is 30.0%, and the water storage capacity of the calcium silicate is 19 times of that of the soil with the same mass.
Example 4
According to the mol ratio of calcium oxide to silicon dioxide of 1.0, kaolin and calcium oxide are used as raw materials to react for 2 hours at the temperature of 200 ℃ and the NaOH concentration of 500 g/L, solid slag with calcium sodium silicate as the main component is synthesized, and the main component is 14.68 percent of Na2O, 33.15% SiO2And 32.70 percent of CaO, mixing the solid slag with dilute alkali liquor with the concentration of NaOH being 20 g/L, and carrying out dynamic hydrothermal decomposition reaction in a reaction kettle at the reaction temperature of 170 ℃ for reaction timeAnd 2 h. And (3) filtering and washing the slurry after reaction to obtain calcium silicate, and washing and drying the calcium silicate to obtain the soil conditioner. The content of citrate soluble silicon in the soil conditioner is 31.1%, and the water storage capacity of calcium silicate is 18 times of that of soil with the same mass.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A preparation method of a citric acid-soluble silicon-rich soil conditioner comprises the following steps:
1) mixing a silicon dioxide-rich substance and a substance taking calcium oxide as a main component, and then reacting in a NaOH solution with the concentration of 100-600 g/L to prepare sodium calcium silicate, wherein the reaction temperature is 150-300 ℃, the reaction time is 0.5-5h, and the molar ratio of the calcium oxide to the silicon dioxide is 0.7-1.2;
2) decomposing calcium sodium silicate in NaOH solution with concentration of 20-50 g/L to obtain calcium silicate, wherein the decomposition reaction temperature is 60-230 ℃, and the reaction time is 2-20 h;
3) and washing and drying the calcium silicate to obtain the soil conditioner rich in citric acid soluble silicon.
2. The method for preparing the soil conditioner rich in citric acid soluble silicon as claimed in claim 1, wherein the silicon dioxide-rich material is one or more of fly ash, quartz sand, kaolin and bentonite.
3. The method for preparing a soil conditioner rich in citric acid soluble silicon as claimed in claim 1, wherein the substance with calcium oxide as main component is one or more of calcium oxide, phosphogypsum and desulfurized gypsum.
4. The method for preparing a soil conditioner rich in citrate soluble silicon as claimed in claim 1, wherein in the step 1), the concentration of NaOH solution is 300-500 g/L, the reaction temperature is 200-230 ℃, and the reaction time is 1-2 h.
5. The method for preparing a soil conditioner rich in citrate soluble silicon as claimed in claim 1, wherein in the step 2), the decomposition reaction temperature is 150-.
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| CN108239536B (en) * | 2016-12-26 | 2021-01-01 | 中国科学院过程工程研究所 | Soil conditioner and preparation method thereof |
| CN109943339B (en) * | 2019-04-18 | 2021-01-26 | 江苏爱佳福如土壤修复有限公司 | Silicon-rich soil conditioner and preparation method and application thereof |
| CN110314928B (en) * | 2019-07-23 | 2021-06-25 | 河北工业大学 | Method for in-situ control of migration of petroleum pollutants in soil |
| CN110330975B (en) * | 2019-07-25 | 2021-04-16 | 深圳前海大地矿物科技有限公司 | Preparation method of soil conditioner and soil conditioner |
| CN111944726A (en) * | 2020-08-24 | 2020-11-17 | 广州市土根旺生物科技有限公司 | Soil microbial population regulator and preparation method and application thereof |
| CN113120913A (en) * | 2021-03-23 | 2021-07-16 | 内蒙古工业大学 | Calcium-magnesium-silicon functional material with hierarchical pore distribution and preparation method and application thereof |
| CN113582780A (en) * | 2021-08-12 | 2021-11-02 | 中国科学院城市环境研究所 | Phosphorus-rich and silicon-rich compost product prepared by adding yellow phosphorus slag and production method thereof |
| CN114381272A (en) * | 2022-02-11 | 2022-04-22 | 瓮福（集团）有限责任公司 | Preparation method of soil conditioner |
| CN114736685A (en) * | 2022-03-04 | 2022-07-12 | 大唐同舟科技有限公司 | Method for producing water-retaining soil conditioner by using alkali-containing solid waste |
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