CN110845279A - Application of serpentine magnesium extraction tailings in field of compound fertilizer, sandy soil compound fertilizer and preparation method thereof - Google Patents

Application of serpentine magnesium extraction tailings in field of compound fertilizer, sandy soil compound fertilizer and preparation method thereof Download PDF

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Publication number
CN110845279A
CN110845279A CN201911248921.9A CN201911248921A CN110845279A CN 110845279 A CN110845279 A CN 110845279A CN 201911248921 A CN201911248921 A CN 201911248921A CN 110845279 A CN110845279 A CN 110845279A
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compound fertilizer
mass
preparation
coal
sandy soil
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卢惠民
卢小溪
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Beijing Oufei Jintai Technology Co Ltd
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Beijing Oufei Jintai Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers
    • C05D3/04—Calcareous fertilisers from blast-furnace slag or other slags containing lime or calcium silicates

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  • Organic Chemistry (AREA)
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  • Inorganic Chemistry (AREA)
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Abstract

The invention provides application of serpentine magnesium extraction tailings in the field of compound fertilizers, a sandy soil compound fertilizer and a preparation method thereof, and belongs to the field of compound fertilizers. The invention provides application of serpentine magnesium extraction tailings in the field of fertilizers, wherein the serpentine magnesium extraction tailings are used for preparing compound fertilizers, so that the serpentine magnesium extraction tailings are completely utilized, and the reutilization of resources is realized.

Description

Application of serpentine magnesium extraction tailings in field of compound fertilizer, sandy soil compound fertilizer and preparation method thereof
Technical Field
The invention relates to the technical field of fertilizers, in particular to an application of serpentine magnesium extraction tailings in the field of compound fertilizers, a sandy soil compound fertilizer and a preparation method thereof.
Background
China has a large amount of serpentine which reaches the level of hundreds of millions of tons and is a good raw material for producing metal magnesium, and China also has a large amount of laterite-nickel ore, the gangue mineral of which is serpentine and is also a good raw material for smelting magnesium. Therefore, when the serpentine and the laterite-nickel ore are used for refining magnesium metal, a large amount of tailings are generated. At present, the tailings have no good treatment method and are not beneficial to recycling of resources.
The sandy soil is widely distributed in inland desert regions or regions with serious wind erosion and desertification, and river, lake and coastal beach lands in China, the soil is composed of tiny particles, and the particles form a soil loose and porous system which is composed of three substances of solid, liquid and gas. The sand is distributed with three kinds of pores, large, medium and small. The sandy soil contains more sand grains, has larger interparticle pores, good ventilation performance and loose soil texture, but water is easy to leak and is difficult to maintain. Therefore, the soil is easily dried and is not drought-enduring. The sandy soil contains less nutrients, has poor fertilizer absorbing and maintaining capacity, and the applied nutrients are easy to run off along with water; the sandy soil has good air permeability, vigorous aerobic microorganism activity, fast nutrient conversion and insufficient aftereffect of fertilization. Therefore, scientific fertilization on sandy soil is the key to ensure the crops to be harvested.
Disclosure of Invention
In view of the above, the invention aims to provide an application of serpentine magnesium extraction tailings in the field of compound fertilizers, a sandy soil compound fertilizer and a preparation method thereof. According to the invention, the serpentine magnesium extraction tailings are used for preparing the compound fertilizer, so that the serpentine magnesium extraction tailings are completely utilized.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides application of serpentine magnesium extraction tailings in the field of fertilizers.
The invention also provides a preparation method of the sand soil compound fertilizer, which comprises the following steps:
mixing and calcining serpentine magnesium extraction tailings, KOH and solid phosphoric acid to obtain a calcined product;
and mixing the calcined product, the coal slime, the coal powder, the water and the water glass, and then sequentially granulating and drying to obtain the sandy soil composite fertilizer.
Preferably, the mass ratio of the serpentine magnesium extraction tailings, KOH and solid phosphoric acid is 2-3: 0.5-1.5.
Preferably, the calcining temperature is 700-800 ℃ and the calcining time is 2-2.5 hours.
Preferably, the mass ratio of the calcined product, the coal slime, the coal powder, the water and the water glass is 1: 0.5-1: 0.5-1.
Preferably, the amount of the water accounts for 3-6% of the total mass of the calcined product, the coal slime and the coal powder.
Preferably, the amount of the water glass accounts for 2-5% of the total mass of the calcined product, the coal slime and the coal powder.
Preferably, the fixed carbon content of the coal slime and the coal dust is 30-60% independently.
Preferably, the particle size of the granules is 1-4 mm.
The invention also provides a sandy soil compound fertilizer prepared by the preparation method of the technical scheme, wherein the sandy soil compound fertilizer contains 18-24% of N and 18-24% of P in percentage by mass2O5The mass percentage of (B) is 8-10%, K210-15% of O, 4-6% of MgO and K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 0.5-1%, and the balance is carbon, alumina, calcium oxide and silicon oxide.
The invention provides application of serpentine magnesium extraction tailings in the field of fertilizers, wherein the serpentine magnesium extraction tailings are used for preparing compound fertilizers, so that the serpentine magnesium extraction tailings are completely utilized, and the reutilization of resources is realized.
The invention also provides a preparation method of the compound fertilizer, which comprises the following steps: mixing and calcining serpentine magnesium extraction tailings, KOH and solid phosphoric acid to obtain a calcined product; and mixing the calcined product, the coal slime, the coal powder, the water and the water glass, and then sequentially granulating and drying to obtain the sandy soil composite fertilizer. In the invention, the tailings for extracting magnesium from serpentine ore mainly comprises 12CaO 7Al2O3And 2 CaO. SiO2The composition is that the crystal form of dicalcium silicate is transformed to expand and the self-crushing property is good, the magnesium extraction tailings are loose white powder, the components of the magnesium extraction tailings are close to those of ordinary portland cement, the magnesium extraction tailings are good cement clinker, the magnesium extraction tailings are used in sandy land, the dosage of the magnesium extraction clinker is proper, medium and small gap soil can be easily formed with sandy soil, large gaps in sandy soil can be filled, and the water retention property, water storage property and fertility retention of the sandy soil can be easily improved. The magnesium extraction tailings are rich in medium elements such as Ca, Mg and the like in solid solution state and beneficial element Si to prepare the magnesium extraction tailingsThe prepared compound fertilizer has extremely low content of harmful elements, meets the requirement of preparing the fertilizer, and simultaneously contains some trace elements required by plant growth, such as calcium, iron, magnesium, zinc, manganese, molybdenum and the like. The leaching toxicity test result of trace harmful elements in the magnesium extraction tailings shows that the magnesium extraction tailings contain less heavy metal pollution risk, the heavy metal exists in a stable state, the effectiveness is extremely low, and the national standard requirements of the organic-inorganic compound fertilizer are met. The magnesium extraction tailings containing a large amount of silicon and solid solubility are utilized to be mixed with K2CO3The composite fertilizer prepared by the method can improve the nutrient structure of soil environment, promote the growth of crops and increase the economic output of the crops under certain preparation conditions. The data of the examples show that the total nutrient (N + P) of the sand soil compound fertilizer prepared by the invention2O5+K2O) is more than or equal to 30 percent, the percentage of water-soluble phosphorus occupying effective phosphorus is more than or equal to 50 percent, the percentage of water content is less than or equal to 2.5 percent, the granularity (1.00 mm-4.75 mm or 3.35 mm-5.60 mm) is more than or equal to 90 percent, the percentage of chloride ions is less than or equal to 3.0 percent, and the percentage content of the contained chemical components meets the requirement of the national standard GB15063-2001 on the medium-concentration compound fertilizer.
Drawings
FIG. 1 is a diagram of a serpentine magnesium extraction tailings;
fig. 2 is a physical diagram of the compound fertilizer in sandy soil.
Detailed Description
The invention provides application of serpentine magnesium extraction tailings in the field of fertilizers.
The invention also provides a preparation method of the sand soil compound fertilizer, which comprises the following steps:
mixing and calcining serpentine magnesium extraction tailings, KOH and solid phosphoric acid to obtain a calcined product;
and mixing the calcined product, the coal slime, the coal powder, the water and the water glass, and then sequentially granulating and drying to obtain the sandy soil composite fertilizer.
According to the invention, serpentine magnesium extraction tailings, KOH and solid phosphoric acid are mixed and then calcined to obtain a calcined product.
In the invention, the mass ratio of the serpentine magnesium extraction tailings, KOH and solid phosphoric acid is preferably 2-3: 0.5-1.5. In the invention, the KOH and the solid phosphoric acid are used in amounts such that the aqueous solution of the calcined product is neutral (pH value is 6.5-7.5), and more preferably pH value is 7.
In the invention, the particle size of the serpentine magnesium extraction tailings and the solid phosphoric acid is preferably 200 meshes.
In the invention, the calcination temperature is preferably 700-800 ℃, more preferably 750 ℃, and the time is preferably 2-2.5 hours. In the present invention, the chemical reaction that occurs during the calcination is as follows:
SiO2+2KOH＝K2SiO3+H2O
K2SiO3+H3PO4＝H2SiO3+K2HPO4
MgO+H3PO4＝MgHPO4+H2O
CaO+H3PO4＝CaHPO4+H2O
in the present invention, the calcination is preferably performed in a heating furnace, which is preferably a rotary kiln, a resistance furnace, or an induction furnace.
After a calcined product is obtained, the calcined product, coal slime, coal dust, water and water glass are mixed and then are sequentially granulated and dried to obtain the sand soil composite fertilizer.
In the present invention, the mass ratio of the calcined product, the coal slurry, the pulverized coal, the water, and the water glass is preferably 1: 0.5-1: 0.5-1. In the present invention, the calcined product is preferably ground to 80 mesh. In the invention, the fixed carbon content of the coal slime and the coal dust is preferably 30-60% independently. In the invention, the pulverized coal is preferably low-grade pulverized coal, and the particle sizes of the coal slurry and the low-grade pulverized coal are preferably 120 meshes.
In the invention, the water is preferably used in an amount of 3-6% of the total mass of the calcined product, the coal slime and the coal powder.
In the invention, the usage amount of the water glass is preferably 2-5% of the total mass of the calcined product, the coal slime and the coal powder. In the present invention, the water glass functions as a granule.
In the present invention, the particle size of the granules is preferably 1 to 4 mm.
In the invention, the drying temperature is preferably 150-200 ℃, the drying time is not particularly limited, and the moisture can be completely removed.
The invention also provides a sandy soil compound fertilizer prepared by the preparation method of the technical scheme, wherein the sandy soil compound fertilizer contains 18-24% of N and 18-24% of P in percentage by mass2O5The mass percentage of (B) is 8-10%, K210-15% of O, 4-6% of MgO and K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 0.5-1%, and the balance is carbon, alumina, calcium oxide and silicon oxide.
In the invention, the total nutrient (N + P) of the sand soil compound fertilizer2O5+K2O) is preferably not less than 30 percent, the percentage of water-soluble phosphorus in available phosphorus is preferably not less than 50 percent, the mass fraction of water is preferably not more than 2.5 percent, the particle size (1.00-4.75 mm or 3.35-5.60 mm) is preferably not less than 90 percent, the mass fraction of chloride ions is preferably not more than 3.0 percent, and the requirement of the national standard GB15063-2001 on the medium-concentration compound fertilizer is met.
In order to further illustrate the invention, the application of the serpentine magnesium extraction tailings in the field of compound fertilizers, the sand soil compound fertilizer and the preparation method thereof are described in detail in the following with reference to examples, but the applications are not to be construed as limiting the scope of the invention.
The preparation method of the serpentine magnesium extraction tailings used in the embodiment of the invention comprises the following steps:
and mining to obtain blocky serpentine ores with the maximum blockiness of 30 cm. The main ore mineral in the serpentine ore is serpentine and contains a small amount of olivine and chromium spinel, and the metal minerals include magnetite, hematite, chromite, pentlandite and chalcopyrite. The chemical composition is shown in table 1.
TABLE 1 serpentine chemical composition
MgO Al2O3 CaO Fe2O3 FeO Mn SiO2 Ni
35.54 0.64 3.36 5.23 1.47 0.048 37.17 0.22
Cr Co P S K2O Na2O TFe H2O
0.12 0.015 0.0022 0.0009 0.055 0.097 4.80 0.48
A1200-ton production line for producing magnesium metal by treating 2 ten thousand tons of serpentine in construction year comprises the following specific production processes: firstly, serpentine and lime are crushed to about 5 cm by a PE400 x 600 jaw crusher, and then the crushed serpentine, lime and silicon-aluminum alloy powder (the chemical components of the silicon-aluminum alloy powder are Al 29-35 wt%, Si 40-45 wt%, Fe 10-20 wt%, and the silicon-aluminum-iron alloy is prepared by an inner Mongolian spring coal gangue carbon thermal reduction method and ground into 120 meshes) and fluorite powder (chemical reagent grade, CaF) are added into a phi 1.5 x 5.7 type ball mill according to the mixture ratio298 percent purity and-80 meshes) are mixed and ground to 120 meshes, 50 percent of serpentine, 40 percent of additive lime (chemical grade, 98 percent purity and-80 meshes) and 10 percent of total amount of silicon-aluminum alloy and catalyst fluorite powder. The ground mixture enters a GF520 dry powder ball press machine to be pressed into balls, the long diameter is 3 cm, and the short diameter is 2 cm. The dry balls enter a vacuum continuous production induction heating magnesium reduction furnace, the vacuum pumping is carried out for 10Pa, the heating power is 1000kW, the temperature is 1200 ℃, and the heat preservation time is 4 hours in each furnace. Feeding and discharging slag under vacuum condition, and keeping vacuum state and constant temperature heating state in the furnace. The magnesium reduction furnace is provided with two magnesium crystallizers, and crude magnesium is periodically and alternately discharged (3 groups). The mixed slag discharged from the furnace is in a block shape, is crushed to micron grade by a double-roll crusher, enters a dry magnetic separator, and has the magnetic field intensity of 8000-12000 gauss to obtain ferronickel alloy particles and finally obtain tailings,namely, the chemical analysis of the serpentine magnesium extraction tailings is shown in table 2. FIG. 1 is a diagram of a serpentine magnesium extraction tailings.
TABLE 2 serpentine magnesium extraction tailings chemistry
Serial number CaO Fe2O3 Al2O3 SiO2 MgO
1 65.73 2.12 7.61 18.46 6.08
2 61.69 13.45 4.39 17.44 3.03
3 61.47 2.04 8.83 20.29 5.47
As can be seen from the results of X-ray diffraction analysis of the tailings, the tailings are mainly 2 CaO. SiO2And a small amount of 12CaO 7Al2O3And (4) forming.
Example 1
Firstly, uniformly mixing the serpentine magnesium extraction tailings (200 meshes), solid KOH (98%) (ground to 200 meshes) and solid phosphoric acid (98%) (ground to 200 meshes) according to the mass ratio of 3: 1.5, then placing the mixture into a heating furnace (a rotary kiln with the model number of SY 2034) for calcining for 2.5 hours at the temperature of 750 ℃ to obtain a calcined product, wherein the pH value of an aqueous solution of the calcined product is 7.
Grinding the calcined product to 80 meshes, adding coal slime with the fixed carbon content of 30% and inferior coal powder (the granularity is 120 meshes), and uniformly mixing, wherein the proportion is 1: 1:1, adding 4 percent of water and 5 percent of water glass by the total mass of the calcined product, the coal slime and the inferior coal powder, granulating to obtain granules with the granularity of 1-3 mm, and drying and packaging at 150 ℃ to obtain the sandy soil compound fertilizer. FIG. 2 is a physical diagram of the obtained sand soil compound fertilizer.
The chemical components of the obtained sand soil compound fertilizer are analyzed, and the results are as follows: the mass percentage of N is 18-24%, and P2O5The mass percentage of (B) is 8-10%, K210-15% of O, 4-6% of MgO and K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 1 percent, and the balance is carbon, alumina, calcium oxide and silicon oxide, which meets the requirements of the national standard GB15063-2001 on the medium-concentration compound fertilizer.
The obtained sand soil compound fertilizer is measured to obtain the total nutrient (N + P)2O5+K2O) is 35 percent, the percentage of water-soluble phosphorus in the available phosphorus is 56 percent, and the percentage of water is 1 percentThe granularity (1.00 mm-4.75 mm) is 97 percent, and the mass fraction of the chloride ions is 1 percent.
And (5) carrying out a fertilizer effect experiment on the sandy soil. Selecting a sandy land in the inner Mongolia spring county. The sandy land has the characteristics of loose soil texture, good drainage, convenient cultivation, difficult hardening and cracking and quick temperature rise in spring. But poor water and fertility retention, low content of effective mineral nutrients, and easy premature senility and aging of cultivated crops. Taking the sandy soil away, and planting wheat in a laboratory, wherein the variety is Lumai No. 15. The tested fertilizer is a sandy soil compound fertilizer and a common compound fertilizer (N-P) prepared in the example2O5-K2O15-15-15), the experimental results show that the yield of wheat is increased by 18% and the yield increasing effect is remarkable when the sandy soil compound fertilizer prepared by the embodiment is applied compared with the treatment of applying the common compound fertilizer.
Example 2
Firstly, uniformly mixing the serpentine magnesium extraction tailings (200 meshes), solid KOH (98%) (ground to 200 meshes) and solid phosphoric acid (98%) (ground to 200 meshes) according to the mass ratio of 2:0.5:0.5, then placing the mixture into a heating furnace (a rotary kiln with the model number of SY 2034) for calcining for 2.5 hours at the temperature of 700 ℃ to obtain a calcined product, wherein the pH value of an aqueous solution of the calcined product is 7.5.
Grinding the calcined product to 80 meshes, adding coal slime with the fixed carbon content of 30% and inferior coal powder (the granularity is 120 meshes), and uniformly mixing, wherein the proportion is 1: 0.5:0.5, adding 3 percent of water and 2 percent of water glass by the total mass of the calcined product, the coal slime and the inferior coal powder, granulating to obtain granules with the granularity of 1-4 mm, and drying and packaging at 200 ℃ to obtain the sandy soil composite fertilizer.
The chemical components of the obtained sand soil compound fertilizer are analyzed, and the results are as follows: the mass percentage of N is 18-24%, and P2O5The mass percentage of (B) is 8-10%, K210-15% of O, 4-6% of MgO and K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 0.8 percent, and the balance is carbon, alumina, calcium oxide and silicon oxide, which meet the national standard GB15063-2001 requirements for medium concentration complex fertilizers.
The obtained sand soil compound fertilizer is measured to obtain the total nutrient (N + P)2O5+K2O) is 31 percent, the percentage of water-soluble phosphorus in the available phosphorus is 53 percent, the mass fraction of water is 0.8 percent, the particle size (1.00 mm-4.75 mm) is 92 percent, and the mass fraction of chloride ions is 1.5 percent.
And (5) carrying out a fertilizer effect experiment on the sandy soil. Selecting a sandy land in the inner Mongolia spring county. The sandy land has the characteristics of loose soil texture, good drainage, convenient cultivation, difficult hardening and cracking and quick temperature rise in spring. But poor water and fertility retention, low content of effective mineral nutrients, and easy premature senility and aging of cultivated crops. Taking the sandy soil away, and planting wheat in a laboratory, wherein the variety is Lumai No. 15. The tested fertilizer is a sandy soil compound fertilizer and a common compound fertilizer (N-P) prepared in the example2O5-K2O15-15-15), the experimental result shows that the yield of wheat is increased by 16% and the yield increasing effect is obvious when the sandy soil compound fertilizer prepared by the embodiment is applied compared with the treatment of applying the common compound fertilizer.
Example 3
Firstly, uniformly mixing the serpentine magnesium extraction tailings (200 meshes), solid KOH (98%) (ground to 200 meshes) and solid phosphoric acid (98%) (ground to 200 meshes) according to the mass ratio of 2:1:1, then putting the mixture into a heating furnace (a rotary kiln with the model number of SY 2034) for calcining for 2 hours at the temperature of 800 ℃ to obtain a calcined product, wherein the pH value of an aqueous solution of the calcined product is 6.5.
Grinding the calcined product to 80 meshes, adding coal slime with fixed carbon content of 60% and inferior coal powder (granularity of 120 meshes), and uniformly mixing, wherein the proportion is 1: 0.5:0.5, adding 6 percent of water and 4 percent of water glass by the total mass of the calcined product, the coal slime and the inferior coal powder, granulating to obtain granules with the granularity of 1-4 mm, and drying and packaging at 200 ℃ to obtain the sandy soil composite fertilizer.
The chemical components of the obtained sand soil compound fertilizer are analyzed, and the result is that the mass percentage of N is 18-24%, and P is2O5The mass percentage of (B) is 8-10%, K2The mass percentage of O is 10-15%, and the mass percentage of MgO isThe content of each component is 4-6%, K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 0.6 percent, and the balance of carbon, alumina, calcium oxide and silicon oxide meets the requirements of the national standard GB15063-2001 on the medium-concentration compound fertilizer.
The obtained sand soil compound fertilizer is measured to obtain the total nutrient (N + P)2O5+K2O) is 40%, the percentage of water-soluble phosphorus occupying the available phosphorus is 59%, the mass fraction of water is 0.6%, the particle size (1.00mm to 4.75mm) is 95%, and the mass fraction of chloride ions is 1.3%.
And (5) carrying out a fertilizer effect experiment on the sandy soil. Selecting a sandy land in the inner Mongolia spring county. The sandy land has the characteristics of loose soil texture, good drainage, convenient cultivation, difficult hardening and cracking and quick temperature rise in spring. But poor water and fertility retention, low content of effective mineral nutrients, and easy premature senility and aging of cultivated crops. Taking the sandy soil away, and planting wheat in a laboratory, wherein the variety is Lumai No. 15. The tested fertilizer is a sandy soil compound fertilizer and a common compound fertilizer (N-P) prepared in the example2O5-K2O15-15-15), the experimental results show that the yield of wheat is increased by 24% and the yield increasing effect is remarkable when the sandy soil compound fertilizer prepared by the embodiment is applied compared with the treatment of applying the common compound fertilizer.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (10)

1. An application of serpentine magnesium extraction tailings in the field of fertilizers.
2. A preparation method of a sand soil compound fertilizer is characterized by comprising the following steps:
mixing and calcining serpentine magnesium extraction tailings, KOH and solid phosphoric acid to obtain a calcined product;
and mixing the calcined product, the coal slime, the coal powder, the water and the water glass, and then sequentially granulating and drying to obtain the sandy soil composite fertilizer.
3. The preparation method according to claim 2, wherein the mass ratio of the serpentine magnesium extraction tailings, KOH and solid phosphoric acid is 2-3: 0.5-1.5.
4. The method according to claim 2 or 3, wherein the calcination is carried out at a temperature of 700 to 800 ℃ for 2 to 2.5 hours.
5. The preparation method according to claim 2, wherein the mass ratio of the calcined product, the coal slurry, the coal dust, the water and the water glass is 1: 0.5-1: 0.5-1.
6. A preparation method according to claim 2 or 5, wherein the water accounts for 3-6% of the total mass of the calcined product, the coal slurry and the pulverized coal.
7. The preparation method according to claim 2 or 5, wherein the amount of the water glass accounts for 2-5% of the total mass of the calcined product, the coal slime and the coal dust.
8. The preparation method according to claim 2 or 5, wherein the fixed carbon content of the coal slurry and the coal dust is independently 30-60%.
9. The method according to claim 2, wherein the granulated material has a particle size of 1 to 4 mm.
10. The sandy soil compound fertilizer prepared by the preparation method of any one of claims 2 to 9, wherein the content of N in the sandy soil compound fertilizer is 18 to 24 percent by mass, and the content of P in the sandy soil compound fertilizer is 18 to 24 percent by mass2O5The mass percentage of (B) is 8-10%, K210-15% of O, 4-6% of MgO and K2O·nSiO24.1-5.2% by mass of Fe2O31-3% by mass of (A), H2The mass percentage of O is 0.5-1%, and the balance is carbon, alumina, calcium oxide and silicon oxide.
CN201911248921.9A 2019-12-09 2019-12-09 Application of serpentine magnesium extraction tailings in field of compound fertilizer, sandy soil compound fertilizer and preparation method thereof Pending CN110845279A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114105713A (en) * 2021-11-29 2022-03-01 济南易航新材料科技有限公司 Compound fertilizer for barren land, preparation method and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114105713A (en) * 2021-11-29 2022-03-01 济南易航新材料科技有限公司 Compound fertilizer for barren land, preparation method and application thereof

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