Compound fertilizer containing rare earth double salt and preparation method thereof

Abstract

The invention discloses a compound fertilizer containing rare earth double salt and a preparation method thereof, and belongs to the field of agricultural fertilizer. The compound fertilizer comprises a rare earth double salt, a solid fertilizer and an additive, wherein the rare earth double salt, calculated as rare earth oxide, accounts for 0.01-10wt% of the compound fertilizer weight; the solid fertilizer, calculated as N, P2O5 and K2O, accounts for 25-86wt% of the compound fertilizer weight; and the additive accounts for 1-5wt% of the compound fertilizer weight. The rare earth double salt is prepared by mixing a solution containing rare earth ions or industrial wastewater, a solution containing ammonium ions and / or alkali metal ions and a solution containing at least one of sulfate radicals, nitrates, oxalates and carbonates or industrial wastewater, and carrying out a precipitation reaction. A product is prepared by steps of raw material crushing, mixing, and extruding granulation or disc granulation. The rare earth double salt of the invention has characteristics of low moisture hygroscopicity and easiness for blending, and can substitute rare earth nitrate and rare earth chloride to be added into a compound fertilizer to increase rare earth compounding property and utilization efficiency.

Description

technical field

[0001] The invention belongs to the technical field of fertilizers, in particular to a compound fertilizer containing rare earth compound salts and a preparation method thereof. Background technique

[0002] The agricultural use of rare earths is an emerging discipline that has achieved significant development in the past 30 years. my country is rich in rare earth resources. In-depth research has been carried out on the agricultural use of rare earths, the environmental chemical and ecological effects of rare earths, and the safety, toxicology and hygiene evaluation of rare earths for agricultural use. The results show that rare earths are not only environmentally friendly, non-toxic and harmless, but also have good effects on regulating plant growth, enhancing plant resistance to drought and disease, and increasing yield. With the popularization and application of rare earths in agriculture, it is very necessary to improve the utilization efficiency of agric...

Examples

Embodiment 1

[0020] Take 200ml of waste water containing 0.4mol / L ammonium sulfate, add 200ml of lanthanum sulfate solution containing 0.3mol / L REO, heat the reaction system to 60°C, adjust the pH value of the system to 4, continue stirring for 30 minutes, separate the solid and liquid, and the solid phase is ready for la 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O.

[0021] The following raw materials were obtained after crushing: La 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O 29.4g, monoammonium phosphate 68.7g and vermiculite and medical stone 1.9g, mix evenly, obtain the compound fertilizer containing rare earth compound salt after the disc granulation process of compound fertilizer is granulated, and the N in the product The content is 7wt%, P 2 o 5 The content is 33wt%, and the REO content is 10.0wt%.

Embodiment 2

[0023] Take 1000ml of waste water containing 0.1mol / L ammonium sulfate, add 500ml of lanthanum cerium chloride waste liquid containing 0.2mol / L REO, the temperature of the reaction system is 10°C, the pH value of the system is adjusted to 3.5, continuous stirring for 100 minutes, solid-liquid separation , the solid phase is (LaCe) 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O.

[0024] The following raw materials were obtained after crushing: (LaCe) 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O 0.3kg, 979.2kg of monoammonium phosphate and 20.5kg of vermiculite and medical stone, mix evenly, press the extrusion granulation process of compound fertilizer to obtain the compound fertilizer containing rare earth compound salt after granulation, the N in the product Content is 10wt%, P 2 o 5 The content of REO is 47wt%, and the content of REO is 0.01wt%.

Embodiment 3

[0026] Get 200ml of industrial wastewater containing 0.15mol / L carbonate and 0.1mol / L potassium ions, add 200ml of mixed rare earth chlorides (comprising lanthanum, cerium, praseodymium and neodymium) containing 0.1mol / LREO, and heat the reaction system to 90°C. Adjust the pH value of the system to 4.5, stir continuously for 45 minutes, separate the solid and liquid, and the solid phase is RE 2 (CO 3 ) 3 ·K 2 CO 3 2H 2 O.

[0027] The following raw materials are taken after comminution: RE 2 (CO 3 ) 3 ·K 2 CO 3 2H 2 O 1.3kg, potassium dihydrogen phosphate 987.5kg and zeolite powder, diatomaceous earth and montmorillonite 11.2kg, mix evenly, press the disc granulation process of compound fertilizer to obtain the compound compound containing rare earth compound salt after granulation Fertilizer, P in the product 2 o 5Content is 51wt%, K 2 The O content was 35 wt%, and the REO content was 0.06 wt%.

technical field

[0001] The invention belongs to the technical field of fertilizers, in particular to a compound fertilizer containing rare earth compound salts and a preparation method thereof. Background technique

[0002] The agricultural use of rare earths is an emerging discipline that has achieved significant development in the past 30 years. my country is rich in rare earth resources. In-depth research has been carried out on the agricultural use of rare earths, the environmental chemical and ecological effects of rare earths, and the safety, toxicology and hygiene evaluation of rare earths for agricultural use. The results show that rare earths are not only environmentally friendly, non-toxic and harmless, but also have good effects on regulating plant growth, enhancing plant resistance to drought and disease, and increasing yield. With the popularization and application of rare earths in agriculture, it is very necessary to improve the utilization efficiency of agric...

Examples

Embodiment 1

[0020] Take 200ml of waste water containing 0.4mol / L ammonium sulfate, add 200ml of lanthanum sulfate solution containing 0.3mol / L REO, heat the reaction system to 60°C, adjust the pH value of the system to 4, continue stirring for 30 minutes, separate the solid and liquid, and the solid phase is ready for la 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O.

[0021] The following raw materials were obtained after crushing: La 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O 29.4g, monoammonium phosphate 68.7g and vermiculite and medical stone 1.9g, mix evenly, obtain the compound fertilizer containing rare earth compound salt after the disc granulation process of compound fertilizer is granulated, and the N in the product The content is 7wt%, P 2 o 5 The content is 33wt%, and the REO content is 10.0wt%.

Embodiment 2

[0023] Take 1000ml of waste water containing 0.1mol / L ammonium sulfate, add 500ml of lanthanum cerium chloride waste liquid containing 0.2mol / L REO, the temperature of the reaction system is 10°C, the pH value of the system is adjusted to 3.5, continuous stirring for 100 minutes, solid-liquid separation , the solid phase is (LaCe) 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O.

[0024] The following raw materials were obtained after crushing: (LaCe) 2 (SO 4 ) 3 ·(NH 4 ) 2 SO 4 2H 2 O 0.3kg, 979.2kg of monoammonium phosphate and 20.5kg of vermiculite and medical stone, mix evenly, press the extrusion granulation process of compound fertilizer to obtain the compound fertilizer containing rare earth compound salt after granulation, the N in the product Content is 10wt%, P 2 o 5 The content of REO is 47wt%, and the content of REO is 0.01wt%.

Embodiment 3

[0026] Get 200ml of industrial wastewater containing 0.15mol / L carbonate and 0.1mol / L potassium ions, add 200ml of mixed rare earth chlorides (comprising lanthanum, cerium, praseodymium and neodymium) containing 0.1mol / LREO, and heat the reaction system to 90°C. Adjust the pH value of the system to 4.5, stir continuously for 45 minutes, separate the solid and liquid, and the solid phase is RE 2 (CO 3 ) 3 ·K 2 CO 3 2H 2 O.

[0027] The following raw materials are taken after comminution: RE 2 (CO 3 ) 3 ·K 2 CO 3 2H 2 O 1.3kg, potassium dihydrogen phosphate 987.5kg and zeolite powder, diatomaceous earth and montmorillonite 11.2kg, mix evenly, press the disc granulation process of compound fertilizer to obtain the compound compound containing rare earth compound salt after granulation Fertilizer, P in the product 2 o 5Content is 51wt%, K 2 The O content was 35 wt%, and the REO content was 0.06 wt%.

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