CN114956872B - Method for preparing silicon fertilizer by activating coal gangue - Google Patents
Method for preparing silicon fertilizer by activating coal gangue Download PDFInfo
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- CN114956872B CN114956872B CN202210746002.XA CN202210746002A CN114956872B CN 114956872 B CN114956872 B CN 114956872B CN 202210746002 A CN202210746002 A CN 202210746002A CN 114956872 B CN114956872 B CN 114956872B
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Abstract
The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a method for preparing a silicon fertilizer by activating coal gangue, which comprises the following steps: crushing coal gangue and organic solid waste respectively to obtain coal gangue powder and organic solid waste powder; mixing gangue powder and organic solid waste powder to obtain a mixture; the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material; and quenching and crushing the activated materials in sequence to obtain the silicon fertilizer. According to the invention, coal gangue and organic solid waste are used as raw materials, and the material calcination can be implemented at a lower temperature, so that the coal gangue is activated efficiently to prepare the silicon fertilizer.
Description
Technical Field
The invention relates to the technical field of solid waste treatment and resource utilization, in particular to a method for preparing a silicon fertilizer by activating coal gangue.
Background
Silicon is the fourth largest nutrient element recognized by the international soil community following N, P, K, and the silicon nutrient element fraction can be supplemented by the application of silicon fertilizer. The reasonable application of the silicon fertilizer can lead the epidermal cells of crops to be siliceous, lead stem and leaf to be straight, reduce shading, promote photosynthesis of leaves, strengthen the resistance of crops to plant diseases and insect pests, and finally can improve the lodging resistance of crops by about 80 percent. Meanwhile, the silicon can enhance the ventilation in the crops, promote the growth of the root systems of the crops and prevent the rot and premature senility of the root systems, because siliconized cells generated in the plants by the crops can effectively adjust the opening and closing degree of leaf pores, influence the transpiration of water and improve the drought resistance, dry hot air resistance and low temperature resistance of the crops. In addition, the silicon can activate phosphorus in soil, promote reasonable migration of phosphorus in crops, and improve the fruiting rate of crops. In addition, the silicon can also adjust the pH value and the salt composition and the content of the soil, promote the decomposition of the organic fertilizer and inhibit the pathogenic bacteria in the soil, thereby improving the soil and improving the growth and the production capacity of crops.
The gangue contains high SiO 2 And organic matters such as carbon, however, under natural conditions, siO in the gangue 2 Is difficult to be directly absorbed by plants, and SiO in the gangue can be converted by certain physical and chemical conversion 2 Is converted into active silicon which can be absorbed by soil and plants, and the conversion process is the activation treatment of coal gangue.
At present, a thermochemical activation method is mainly adopted for the activation treatment of silicon in coal gangue. For example, chinese patent publication No. CN109928782a discloses a method for preparing silicon fertilizer from coal gangue: mixing gangue with limestone (activating agent) and auxiliary agent, calcining at 800-1300 deg.C to obtain silicon fertilizer. However, the preparation method needs to be carried out at a higher temperature and needs to add an activator and other conditions to realize the activation of the coal gangue.
Disclosure of Invention
In view of the above, the invention provides a method for preparing a silicon fertilizer by activating coal gangue. According to the method provided by the invention, coal gangue and organic solid waste are used as raw materials, the coal gangue and the organic solid waste are calcined together at a lower temperature, and the silicon fertilizer is prepared by promoting the activation of the coal gangue through the synergistic effect of the coal gangue and the organic solid waste.
In order to achieve the above purpose, the invention provides a method for preparing a silicon fertilizer by activating coal gangue, which comprises the following steps:
crushing coal gangue and organic solid waste respectively to obtain coal gangue powder and organic solid waste powder;
mixing gangue powder and organic solid waste powder to obtain a mixture;
the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material;
quenching and crushing the activated materials in sequence to obtain the silicon fertilizer;
the calcination is a first calcination and a second calcination which are sequentially carried out;
the pyrolysis treatment is carried out at a temperature of between room temperature and 600 ℃ under the condition of air isolation;
the first calcination temperature is 710-725 ℃; the second calcination temperature is 820-890 ℃.
Preferably, the chemical composition of the coal gangue in mass percent satisfies the following conditions: siO (SiO) 2 ≥40％，Al 2 O 3 ≤40％，K 2 O≥1.25％，Fe 2 O 3 Less than or equal to 5 percent of Na 2 The requirement that O is less than or equal to 1.00 percent, and the ash content of the gangue is more than or equal to 85 percent.
Preferably, the ash component composition of the organic solid waste in mass percent satisfies: k (K) 2 O > 1.50% and Na 2 O is less than or equal to 1.0 percent.
Preferably, the particle size of the gangue powder is less than 5mm.
Preferably, the particle size of the organic solid waste powder is less than 6mm.
Preferably, the mass ratio of the gangue powder to the organic solid waste powder is 60-80: 20-40.
Preferably, the time of the first calcination is 15-25 min; the second calcination time is 60-90 min;
preferably, the stable temperature is 550-600 ℃ and the time is 20-35 min.
Preferably, the quenching temperature is less than or equal to 8 ℃ and the time is 1-10 min.
Preferably, the particle size of the silicon fertilizer is less than 0.25mm.
The invention provides a method for preparing a silicon fertilizer by activating coal gangue, which comprises the following steps: crushing coal gangue and organic solid waste respectively to obtain coal gangue powder and organic solid waste powder; mixing gangue powder and organic solid waste powder to obtain a mixture; the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material; quenching and crushing the activated materials in sequence to obtain the silicon fertilizer; the calcination is a first calcination and a second calcination which are sequentially carried out; the pyrolysis treatment is carried out at a temperature of between room temperature and 600 ℃ under the condition of air isolation; the first calcination temperature is 710-725 ℃; the second calcination temperature is 820-890 ℃. According to the invention, firstly, the coal gangue and the organic solid waste raw materials are crushed into powder with a fresh section through crushing, a foundation is provided for subsequent full pyrolysis treatment and calcination, and then the coal gangue powder and the organic solid waste powder are mixed and subjected to pyrolysis treatment. In the pyrolysis process, the organic solid waste is pyrolyzed to form the waste rich in H 2 、CO、CH 4 And pyrolysis tar and pyrolysis coke. In the later stage, the air is introduced to transform the atmosphere, the fuel gas starts to burn, and the pyrolysis tar (by-product generated by the combustion of the organic solid waste) is ignited, so that the temperature is further increased, and the pyrolysis tar of the organic solid waste is promoted to be fully combusted and burned out. Then, as the temperature continues to rise, the organic solid waste is completely combusted to form incandescent active ash slag containing higher alkali metal and alkaline earth metal, and the incandescent active ash slag and the coal gangue are synergistic to promote the activation of the coal gangue.In the process, with the temperature rise, the crystal water and interlayer water in the gangue are gradually separated out, pores and channels appear, and a reaction place is provided for the reaction with the hot active ash slag. At the same time, as the temperature continues to rise, the kaolin in the gangue changes phase to form metakaolin with high reactivity and steady-state alpha-SiO 2 Is also gradually converted into beta-SiO 2 Metakaolin and beta-SiO 2 Can react with the hot active ash to form silicate or metasilicate active silicon-containing compound, thereby realizing the activation of the silicon-containing component in the gangue, and then stabilizing the active structure and phase of the activated material, thereby obtaining the activated gangue.
Detailed Description
The invention provides a method for preparing a silicon fertilizer by activating coal gangue, which comprises the following steps:
crushing coal gangue and organic solid waste respectively to obtain coal gangue powder and organic solid waste powder;
mixing gangue powder and organic solid waste powder to obtain a mixture;
the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material;
quenching and crushing the activated materials in sequence to obtain the silicon fertilizer;
the calcination is a first calcination and a second calcination which are sequentially carried out;
the pyrolysis treatment is carried out at a temperature of between room temperature and 600 ℃ under the condition of air isolation;
the first calcination temperature is 710-725 ℃; the second calcination temperature is 820-890 ℃.
In the present invention, the raw materials used in the present invention are preferably commercially available products unless otherwise specified.
According to the invention, coal gangue and organic solid waste are respectively crushed to obtain coal gangue powder and organic solid waste powder.
In the invention, the chemical composition of the coal gangue preferably satisfies the following weight percentage: siO (SiO) 2 ≥40％，Al 2 O 3 ≤40％，K 2 O is more than or equal to 1.25 percent and Na 2 O is less than or equal to 2.00%, more preferably, 40% or less of SiO is satisfied 2 ≤65％，25％≤Al 2 O 3 ≤40％，3％≤Fe 2 O 3 ≤5％，1.0％≤K 2 O≤3.0％，0.5％≤Na 2 O is less than or equal to 1.80 percent. In the invention, the ash content of the gangue preferably meets the requirement of Ad not less than 85%. In the present invention, the particle size of the gangue is preferably < 5mm.
In the present invention, the ash component of the organic solid waste preferably satisfies, in mass percent: k (K) 2 O > 1.50% and Na 2 O is less than or equal to 1.0%, and the moisture of the organic solid waste is less than 30%; if the moisture content of the organic solid waste is higher than 30%, the organic solid waste is preferably crushed after being dried until the moisture content is less than 30%. In the embodiment of the invention, the organic solid waste preferably comprises agricultural straw, garden waste or urban organic solid waste; the agricultural straw preferably comprises corn straw and wheat straw; the garden waste preferably comprises a garden branch; the municipal organic solid waste preferably comprises household waste.
In the present invention, the crushing of the organic solid waste preferably includes shearing crushing and rotary cutting crushing performed sequentially, and the shearing crushing is performed until the particle size of the material is preferably less than 30mm, more preferably less than 25mm; the rotary cutting is carried out until the grain diameter of the material is preferably less than 6mm, more preferably less than 5mm. In the present invention, the crushing allows the formation of a plurality of fine-grained materials with fresh cross-section from gangue and organic solid waste materials.
After the coal gangue powder and the organic solid waste powder are obtained, the coal gangue powder and the organic solid waste powder are mixed to obtain the mixture.
In the invention, the mass ratio of the gangue powder to the organic solid waste powder is preferably 60-80: 20 to 40, more preferably 60 to 75:25 to 40. In the present invention, the mixing is preferably performed in a screw mixer.
After the mixture is obtained, the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material.
In the present invention, the pyrolysis treatment is preferably a pyrolysis treatment of the mixture under the condition of air insulation, and in the present invention, the pyrolysis treatment is preferably a pyrolysis treatment of heating the mixture from room temperature to 600 ℃ and then preserving the heat at 600 ℃ for 15-25 min. In the present invention, the time required for the temperature to rise from room temperature to 600℃is preferably 60 to 90 minutes, more preferably 65 to 90 minutes. In the invention, the pyrolysis treatment can thermally crack the organic solid waste to form the waste rich in H 2 、CO、CH 4 Small molecular organic compounds such as combustible gas, oil such as tar, and the like, and macromolecular porous active pyrolytic tar.
In the present invention, the calcination is preferably a first calcination and a second calcination which are sequentially performed, and the temperature of the first calcination is 710 to 725 ℃, more preferably 710 to 720 ℃, and the time is preferably 15 to 25 minutes, more preferably 20 to 25 minutes. In the present invention, the air excess coefficient of the first calcination is preferably 1.0 to 1.05, more preferably 1.01 to 1.03. In the present invention, the first calcination is to convert the isolated air state into the air, and then raise the temperature from the pyrolysis treatment temperature to the first calcination temperature, and the required time is preferably 20 to 30 minutes, more preferably 25 to 30 minutes. In the invention, the first calcination causes the small molecule combustible gas formed by pyrolysis to burn first, and then causes tar and pyrolytic tar to burn fully.
In the invention, the second calcining temperature is 820-890 ℃, preferably 825-890 ℃; the time is preferably 60 to 90min, more preferably 60 to 85min; the excess air ratio of the second calcination is preferably 1.10 to 1.25, more preferably 1.15 to 1.25. In the present invention, the time required for the temperature to rise from the first calcination temperature to the second calcination temperature is preferably 20 to 30 minutes, more preferably 25 to 30 minutes. In the invention, the second calcination is to completely combust the organic solid waste to form hot active ash slag, so that the active ash slag and the coal gangue are synergistic to promote the activation of the coal gangue.
In the present invention, the stable temperature is preferably 550 to 600 ℃, more preferably 555 to 600 ℃; the time is preferably 20 to 35 minutes, more preferably 25 to 35 minutes; the excess air ratio of the stabilization process is 1.15 to 1.35, more preferably 1.15 to 1.30. In the present invention, the time required for the temperature to be lowered from the second calcination temperature to the stabilization temperature is preferably 15 to 25 minutes, more preferably 20 to 25 minutes. In the present invention, the stabilization enables stabilization of the active structure and phase of the calcined material.
After the activated material is obtained, the activated material is quenched and crushed in sequence to obtain the silicon fertilizer.
In the present invention, the temperature of the quenching is preferably 8 ℃ or less, more preferably 7 ℃; the time is preferably 1 to 10 minutes, more preferably 1 to 9 minutes.
In the present invention, the pulverization is preferably carried out in a roller crusher, and the particle size of the silicon fertilizer is preferably < 0.25mm, more preferably 0.245mm.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Coal gangue of a certain mine in Shaanxi is selected, and the properties and compositions of the coal gangue are shown in table 1.
Table 1 industrial analysis and ash composition of gangue in shanxi certain mines
And crushing the gangue until the particle size is smaller than 5mm, and obtaining gangue powder.
And (3) drying the corn straw until the moisture content is lower than 30%, shearing and crushing until the grain diameter is smaller than 30mm, and then rotary-cutting and crushing the materials obtained by shearing and crushing until the grain diameter is smaller than 6mm, so as to obtain the corn straw powder.
Adding coal gangue powder and corn stalk powder into a spiral mixer according to the mass ratio of 70:30, and mixing to obtain a mixture.
Heating the mixture from room temperature to 600 ℃ within 75min under the condition of isolating air, and keeping the temperature at 600 ℃ for 20min for pyrolysis treatment; then air is introduced, the temperature is raised to 710 ℃ within 25min under the condition that the air excess coefficient is 1.0, and the first calcination is carried out for 20min at constant temperature; then the air excess coefficient is regulated to 1.19, the temperature is raised to 855 ℃ in 25min, the second calcination is carried out, and the constant temperature is maintained for 75min. Then the air excess coefficient is regulated to be 1.25, the temperature is slowly reduced, the temperature is reduced to 575 ℃ within 20min, and the constant temperature is stabilized for 30min, so as to obtain the activated material.
Quenching the obtained activated material at 5 ℃ for 10min, and crushing until the particle size is smaller than 0.25mm to obtain the silicon fertilizer.
The silicon fertilizer has been tested to be effective silicon (SiO 2 Calculated) content is 37.48%, the moisture content is 1.55%, the fineness (passing through a 250 μm standard sieve) is more than or equal to 95%, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
Example 2
And crushing the gangue in the table 1 until the particle size is smaller than 5mm, and obtaining the gangue powder.
And (3) drying the garden tree branches until the moisture content is lower than 30%, then shearing and crushing until the particle size is smaller than 30mm, and then conducting rotary cutting and crushing on the materials obtained by shearing and crushing until the particle size of the materials is smaller than 6mm, thus obtaining the garden tree branch powder.
Adding the gangue powder and the garden branch powder into a spiral mixer according to the mass ratio of 60:40, and mixing to obtain the mixture.
Heating the mixture from room temperature to 600 ℃ within 65min under the condition of isolating air, and keeping the temperature at 600 ℃ for 25min for pyrolysis treatment; then air is introduced, and the temperature is raised to 715 ℃ within 20min under the condition that the air excess coefficient is 1.05, and the first calcination is carried out for 25min; then the air excess coefficient is regulated to 1.15, the temperature is raised to 875 ℃ in 20min, the second calcination is carried out, and the constant temperature is kept for 85min. The air excess factor was then adjusted to 1.20 and the temperature was reduced to 585℃over 15min and allowed to stabilize for 25min.
Quenching the obtained activated material for 8min at the temperature of 6 ℃, and then crushing the material to the granularity of less than 0.25mm to obtain the silicon fertilizer.
Effective silicon (in SiO) 2 Calculated) is 34.77 percent, the moisture content is 1.20 percent, the fineness (passing through a 250 mu m standard sieve) is more than or equal to 90 percent, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
Example 3
And (3) crushing the gangue in the table 1 until the particle size is smaller than 5mm, and obtaining the gangue powder.
And (3) drying the household garbage until the moisture content is lower than 30%, shearing and crushing until the particle size is smaller than 30mm, and then rotary-cutting and crushing the materials obtained by shearing and crushing until the particle size of the materials is smaller than 6mm, so as to obtain the urban organic solid waste powder.
The coal gangue powder and the household garbage powder are mixed according to the mass ratio of 65:35 are added into a spiral mixer for mixing, and then the mixture is obtained.
Heating the mixture from room temperature to 600 ℃ within 70min under the condition of isolating air, and keeping the temperature at 600 ℃ for 20min for pyrolysis treatment; then air is introduced, the temperature is raised to 710 ℃ within 15min under the condition that the air excess coefficient is 1.0, and the first calcination is carried out for 20min at constant temperature; then the air excess coefficient is regulated to 1.15, the temperature is raised to 880 ℃ in 25min, the second calcination is carried out, and the constant temperature is maintained for 80min. Then the air excess coefficient is adjusted to be 1.20, the temperature is slowly reduced, the temperature is reduced to 565 ℃ within 20min, and the mixture is stabilized for 20min, so as to obtain the activated material.
Quenching the obtained activated material for 8min at the temperature of 5 ℃, and crushing the activated material until the particle size is smaller than 0.25mm to obtain the silicon fertilizer.
Effective silicon (in SiO) 2 Calculated) is 35.75 percent, the moisture content is 1.15 percent, the fineness (passing through a 250 mu m standard sieve) is more than or equal to 90 percent, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
Example 4
Coal gangue in a mine is selected, and properties and compositions of the coal gangue are shown in table 2.
Table 2 Industrial analysis and Gray composition of gangue covering certain mine
The gangue described in Table 2 above was crushed to obtain a gangue powder having a particle size of less than 5mm.
Drying the wheat straw until the moisture content is lower than 30%, shearing and crushing until the grain diameter is smaller than 30mm, and then rotary-cutting and crushing the materials obtained by shearing and crushing until the grain diameter of the materials is smaller than 6mm, so as to obtain the wheat straw powder.
The coal gangue powder and the wheat straw powder are mixed according to the mass ratio of 70:30 is added into a spiral mixer for mixing, and then the mixture is obtained.
Heating the mixture from room temperature to 600 ℃ within 80min under the condition of isolating air, and keeping the temperature at 600 ℃ for 18min for pyrolysis treatment; then air is introduced, the temperature is raised to 710 ℃ within 20min under the condition that the air excess coefficient is 1.05, and the first calcination is carried out for 25min; then the air excess coefficient is regulated to 1.19, the temperature is raised to 885 ℃ in 20min, the second calcination is carried out, and the constant temperature is kept for 85min. Then the air excess coefficient is adjusted to be 1.25, the temperature is reduced to 570 ℃ within 15min, and the mixture is stabilized for 25min, so as to obtain the activated material.
Quenching the obtained activated material for 9min at the temperature of 6 ℃ and then crushing the activated material until the particle size is smaller than 0.25mm, thus obtaining the silicon fertilizer.
Effective silicon (in SiO) 2 Calculated) is 29.10 percent, the moisture content is 1.25 percent, the fineness (passing through a 250 mu m standard sieve) is more than or equal to 95 percent, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
Example 5
Crushing the gangue in the table 2 until the particle size is less than 5mm, and obtaining the gangue powder.
And (3) drying the garden branches until the moisture content is lower than 30%, shearing and crushing until the particle size is smaller than 30mm, and then rotary-cutting and crushing the materials obtained by shearing and crushing until the particle size of the materials is smaller than 6mm.
Adding 65% by mass of gangue powder and 35% by mass of garden branch powder into a spiral mixer for mixing to obtain a mixture.
Heating the mixture from room temperature to 600 ℃ within 90min under the condition of isolating air, and keeping the temperature at 600 ℃ for 20min for pyrolysis treatment; then air is introduced, the temperature is raised to 710 ℃ within 25min under the condition that the air excess coefficient is 1.05, and the first calcination is carried out for 20min at constant temperature; then the air excess coefficient is regulated to 1.20, the temperature is raised to 890 ℃ in 25min, the second calcination is carried out, and the constant temperature is maintained for 80min. After the second calcination, the air excess coefficient is adjusted to be 1.25, the temperature is reduced to 570 ℃ within 20min, and the mixture is stabilized for 30min, so as to obtain an activated material.
Quenching the obtained activated material at 7 ℃ for 6min, and crushing until the particle size is smaller than 0.25mm to obtain the silicon fertilizer.
Tested, effective silicon (in SiO 2 Calculated) content is 30.47%, the moisture content is 1.25%, the fineness (passing through a 250 μm standard sieve) is more than or equal to 90%, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
Example 6
Crushing the gangue in the table 2 until the particle size is less than 5mm, and obtaining the gangue powder.
And (3) drying the household garbage until the moisture content is lower than 30%, shearing and crushing until the particle size is smaller than 30mm, and then rotary-cutting and crushing the materials obtained by shearing and crushing until the particle size of the materials is smaller than 6mm, so as to obtain the household garbage powder.
Adding 65% by mass of coal gangue powder and 35% by mass of household garbage powder into a spiral mixer for mixing to obtain a mixture.
Heating the mixture from room temperature to 600 ℃ within 85min under the condition of isolating air, and keeping the temperature at 600 ℃ for 25min for pyrolysis treatment; then air is introduced, the temperature is raised to 710 ℃ within 25min under the condition that the air excess coefficient is 1.05, and the first calcination is carried out for 20min at constant temperature; then the air excess coefficient is regulated to 1.25, the temperature is raised to 890 ℃ in 15min, the second calcination is carried out, and the constant temperature is maintained for 80min. Then the air excess coefficient is adjusted to be 1.29, the temperature is reduced to 590 ℃ within 20min, and the mixture is stabilized for 20min, so as to obtain the activated material.
Quenching the obtained activated material at the temperature of 5 ℃ for 8min, and crushing the quenched activated material until the particle size is smaller than 0.25mm, thereby obtaining the silicon fertilizer.
Effective silicon (in SiO) 2 Calculated) is 31.88 percent, the moisture content is 1.20 percent, the fineness (passing through a 250 mu m standard sieve) is more than or equal to 95 percent, and the method meets the index requirements in NY/T797-2004 silicon fertilizer.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be within the scope of the present invention.
Claims (10)
1. The method for preparing the silicon fertilizer by activating the coal gangue is characterized by comprising the following steps of:
crushing coal gangue and organic solid waste respectively to obtain coal gangue powder and organic solid waste powder;
mixing gangue powder and organic solid waste powder to obtain a mixture;
the mixture is subjected to pyrolysis treatment, calcination and stabilization in sequence to obtain an activated material;
quenching and crushing the activated materials in sequence to obtain the silicon fertilizer;
the calcination is a first calcination and a second calcination which are sequentially carried out; the pyrolysis treatment is carried out at a temperature of between room temperature and 600 ℃ under the condition of air isolation; the first calcination temperature is 710-725 ℃; the second calcination temperature is 820-890 ℃; the organic solid waste is agricultural straw, garden waste or household garbage.
2. The method according to claim 1, wherein the chemical composition of the coal gangue, in mass percent, satisfies: siO (SiO) 2 ≥40％，Al 2 O 3 ≤40％，K 2 O≥1.25％，Fe 2 O 3 Less than or equal to 5 percent of Na 2 The requirement that O is less than or equal to 1.00 percent,the ash content of the gangue is required to meet the requirement that Ad is more than or equal to 85 percent.
3. The method according to claim 1, wherein the ash component composition of the organic solid waste, in mass percent, satisfies: k (K) 2 O > 1.50% and Na 2 O is less than or equal to 1.0 percent.
4. The method of claim 1, wherein the gangue powder has a particle size of less than 5mm.
5. The method of claim 1, wherein the organic solid waste powder has a particle size of less than 6mm.
6. The method according to claim 1 or 5, wherein the mass ratio of the coal gangue powder to the organic solid waste powder is 60-80: 20-40.
7. The method of claim 1, wherein the first calcination is for a period of 15 to 25 minutes; the second calcination time is 60-90 min.
8. The method according to claim 1, wherein the stable temperature is 550-600 ℃ for 20-35 min.
9. The method according to claim 1, wherein the quenching temperature is less than or equal to 8 ℃ for 1 to 10 minutes.
10. The method of claim 1, wherein the silicon fertilizer has a particle size of < 0.25mm.
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| CN109928782A (en) * | 2019-04-26 | 2019-06-25 | 珠海三豫环保新材料科技有限公司 | A kind of method that gangue prepares siliceous fertilizer |
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| CN103695015A (en) * | 2014-01-06 | 2014-04-02 | 中盈长江国际新能源投资有限公司 | Device and method for accelerating gas generating speed by biomass pyrolysis and obtaining nanoscale carbon dioxide material |
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