Method for producing novel carbon-sulfur-based special compound fertilizer by mixing ammonium sulfate and ammonium bicarbonate

Abstract

The invention relates to the field of chemical fertilizers, in particular to a novel carbon-sulfur-based compound fertilizer which comprises novel carbon-sulfur-based ammonium salt crystals generated by recrystallization of ammonium sulfate and ammonium bicarbonate. According to the compound fertilizer, ammonium sulfate and ammonium bicarbonate which are subjected to desulfurization and decarbonization are directly used as raw materials, the two raw materials are fully mixed, mechanical extrusion recrystallization is combined, and a mechanical extrusion granulation process is combined, so that a novel carbon-sulfur-based ammonium salt crystal is produced. The crystal particles are high in strength, stable in chemical property and remarkable in yield increasing effect.

Description

Technical Field

[0001] The invention relates to the field of chemical fertilizers, in particular to a novel carbon-sulfur-based special compound fertilizer. The compound fertilizer comprises new carbon-sulfur-based ammonium salt crystals produced by recrystallization of ammonium sulfate and ammonium bicarbonate. Background Art

[0002] Ammonia desulfurization and caprolactam desulfurization processes produce a large amount of by-product ammonium sulfate (ammonium sulfate), which needs to be centrifuged and dried to reduce the water content before it can be used as a fertilizer raw material. This type of post-processing process not only consumes a lot of energy, but may also cause the ammonium sulfate to decompose during the high-temperature drying process, resulting in a waste of resources and environmental pollution. At the same time, the ammonia carbon capture process produces a large amount of by-product ammonium bicarbonate. Ammonium bicarbonate has unstable chemical properties and there is a large amount of volatilization in the consumption reduction process, and large-scale volatilization causes environmental pollution. Therefore, the wet ammonium sulfate and wet ammonium bicarbonate before the drying process are mixed and extruded into granules, and then recrystallized to produce new carbon-sulfur ammonium salt crystals. These crystals have stable chemical properties and increased strength after granulation, overcoming the shortcomings of the above-mentioned ammonium sulfate and ammonium bicarbonate, which are poor in stability, easy to decompose, and pollute the environment.

[0003] With the advancement of the country's "dual carbon" goals, there is an urgent need to develop a green, low-carbon fertilizer with low energy consumption, low cost, and minimal environmental pollution. The present invention can achieve these goals. At the same time, the widespread use of this green, low-carbon fertilizer can further promote the promotion of carbon capture technology. Summary of the Invention

[0004] 1. Purpose of the Invention

[0005] The present invention aims to provide a method for producing a novel carbon-sulfur-based special compound fertilizer by mixing wet ammonium sulfate and wet ammonium bicarbonate. The method utilizes the wet ammonium sulfate and wet ammonium bicarbonate to produce novel carbon-sulfur-based ammonium salt crystals, combines the method with mechanical extrusion granulation technology, simplifies the process flow, reduces energy consumption, and simultaneously prepares a compound fertilizer with high granule strength, stable chemical properties, and long-term storage.

[0006] 2. Technical methods

[0007] 1) Raw material selection and processing

[0008] Wet ammonium sulfate: Use wet ammonium sulfate solid.

[0009] Ammonium bicarbonate: Use wet ammonium bicarbonate solid.

[0010] 2) Mixing

[0011] The wet ammonium sulfate solid is mixed with the wet ammonium bicarbonate solid, and the wet ammonium sulfate and wet ammonium bicarbonate are recrystallized to generate a new substance, namely, carbonylsulfonyl ammonium salt crystals, which improves the chemical stability and overcomes the problems of the ammonium sulfate drying process and the easy volatility and decomposition of ammonium bicarbonate.

[0012] 3) Mechanical extrusion granulation process

[0013] The granulation is carried out using an extrusion granulator.

[0014] 3. Technological advantages

[0015] Directly utilizing wet ammonium sulfate solid and wet ammonium bicarbonate solid, eliminating high-energy consumption processes such as drying, can achieve the synergistic resource utilization of desulfurization process by-products and carbon capture process products, reducing environmental pollution during the production, transportation, storage and use of fertilizers. At the same time, it reduces fertilizer production costs, promotes the development of carbon capture technology, and helps achieve the "dual carbon" goals.

[0016] Improved Product Performance: This carbon-sulfur-based special compound fertilizer is made from wet solid ammonium sulfate and wet solid ammonium bicarbonate. Through recrystallization of ammonium sulfate and ammonium bicarbonate, a new, more stable carbon-sulfur-based ammonium salt crystal is obtained, overcoming the unstable and easily decomposed structure of ammonium bicarbonate. Nutrients such as phosphorus, potassium, magnesium, and calcium required by various crops are added to the new carbon-sulfur-based ammonium salt crystals. Extrusion granulation is used to produce special compound fertilizer granules, addressing the issues of ammonium bicarbonate's easy decomposition and agglomeration. The new carbon-sulfur-based special compound fertilizer granules are strong and chemically stable, with no changes in appearance, structure, weight, or strength after two months of storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the method according to Example 1 of the present invention.

[0018] The reference numerals in the accompanying drawings of the present invention are as follows:

[0019] 1. Wet ammonium sulfate solid; 2. Wet ammonium bicarbonate solid; 3. New carbon-sulfur based ammonium salt crystals; 4. New carbon-sulfur based special compound fertilizer. DETAILED DESCRIPTION

[0020] New carbon-sulfur-based ammonium salt crystals 3 are produced by mixing wet ammonium sulfate solid 1 and wet ammonium bicarbonate solid 2 for recrystallization; the new carbon-sulfur-based ammonium salt crystals 3 are molded with nutrients such as phosphorus, potassium, magnesium, and calcium required by various crops through an extrusion granulator to obtain a new carbon-sulfur-based special compound fertilizer 4 with high particle strength and stable chemical properties.

[0021] The wet ammonium sulfate and wet ammonium bicarbonate used in the present invention can be any suitable wet ammonium sulfate solid and wet ammonium bicarbonate solid, in particular, wet ammonium sulfate and wet ammonium bicarbonate obtained through ammonia desulfurization and carbon capture process.

[0022] Calcium in fertilizers is one of the essential secondary elements for plant growth, and is mainly involved in physiological processes such as cell wall formation, enzyme activity regulation, and nutrient absorption. This includes natural mineral calcium fertilizers, such as agricultural lime, which contains calcium carbonate (CaCO3) or calcium magnesium carbonate (CaCO3×MgCO3), gypsum; superphosphate; and specialized calcium fertilizers such as calcium nitrate, chelated calcium such as calcium EDTA, and sugar alcohol calcium.

[0023] Magnesium in fertilizers is an essential nutrient for plant growth. Its functions mainly involve chlorophyll synthesis and photosynthesis, enzyme activation and protein synthesis; in particular, it includes magnesium sulfate, magnesium chloride, calcium magnesium phosphate fertilizer, etc.

[0024] Phosphorus in fertilizers is an essential element for plant growth and development. Its functions involve energy metabolism, cell division, and enhanced stress resistance, among other aspects. This is especially true for water-soluble phosphate fertilizers such as superphosphate and double superphosphate; citrate-soluble phosphate fertilizers such as calcium magnesium phosphate; natural phosphate fertilizers such as seabird droppings, animal bone meal, and fish bone meal; and chemical phosphate fertilizers such as superphosphate, monoammonium phosphate, and diammonium phosphate.

[0025] Potassium nutrient in fertilizer is one of the core elements for plant growth. Its functions and characteristics mainly involve promoting metabolism and enzyme activation, enhancing stress resistance, and improving quality and yield; in particular, it includes potassium chloride, potassium sulfate, potassium dihydrogen phosphate, etc.

[0026] Example 1

[0027] 1) Recrystallizing the wet ammonium sulfate solid obtained by the ammonia desulfurization and carbon capture process with the wet ammonium bicarbonate solid to produce new carbonylsulfur ammonium salt crystals;

[0028] 2) Extrusion granulation of new carbon-sulfur ammonium salt crystals with nutrients such as phosphorus, potassium, calcium and magnesium;

[0029] 3) The mechanical strength of the obtained particles was 28N, and the appearance, quality and strength did not change after 60 days.

[0030] Example 2

[0031] 1) Recrystallizing the wet ammonium sulfate solid obtained by the ammonia desulfurization and carbon capture process with the wet ammonium bicarbonate solid to produce new carbonylsulfur ammonium salt crystals;

[0032] 2) The new carbonylsulfonyl ammonium salt crystals are directly granulated;

[0033] 3) The mechanical strength of the obtained particles was 28N, and the appearance, quality and strength did not change after 60 days.

[0034] Example 3

[0035] The Shengzhou demonstration field uses the high-quality green tea variety Longjing 43 as the target. The demonstration field applies a new type of carbon-sulfur-based special compound fertilizer. The overall growth is significantly better than the surrounding conventionally fertilized tea gardens, with an increase in yield of about 5% and a reduction in fertilizer costs of about 30%.

[0036] The Cixi demonstration test site uses the high-quality vegetable variety Shanghai Xiang as the target. The demonstration field applies a new type of carbon-sulfur-based special compound fertilizer. Compared with the plots where farmers apply conventional compound fertilizers, the vegetable grows more vigorously and evenly, the yield increases by about 6%, and the fertilizer cost decreases by 10%.

[0037] The above demonstration project areas have achieved two major breakthroughs compared with traditional fertilization models: first, the yield per unit area has increased, and the yield increase of some crops can reach more than 5%; second, the cost of new carbon-sulfur based special compound fertilizers has dropped by 10-30%.

[0038] Example 4

[0039] In Nanjing, a new type of carbon-sulfur-based special compound fertilizer was applied in vegetable fields (sweet corn, edamame, potatoes) and rice-wheat rotation contracted land (rice, wheat). Compared with the conventional compound fertilizers applied locally, the yields of sweet corn, edamame, potatoes, rice, and wheat increased significantly, and the fertilizer cost decreased significantly.

[0040] Comparative Example 1

[0041] Ammonium bicarbonate is granulated with phosphorus, potassium and other substances, and the resulting granules have a strength of 4-10N. After 30 days, the granules become powdery in appearance and compacted.

[0042] The method of the present invention is significantly superior to the conventional process of Comparative Example 1 in terms of strength and stability.

[0043] Technical Effects

[0044] The present invention achieves the following core effects:

[0045] 1. Significantly reduce energy consumption: eliminating the ammonium sulfate post-treatment process, reducing energy consumption by more than 80%;

[0046] 2. Improved product performance: Particle strength is increased to over 20N, and the chemical properties are stable, meeting the needs of large-scale warehousing and transportation;

[0047] 3. The fertilizer has significant effects: it improves crop yield and quality and reduces farmers’ planting costs;

[0048] 4. Outstanding environmental benefits: Ammonia-based integrated desulfurization and decarbonization co-production fertilizer technology and products are in line with the national "dual carbon" policy and are conducive to the promotion of carbon capture process technology.

[0049] The above description is merely a preferred embodiment of the present invention. Those skilled in the art, once understanding the technical means of the present invention, will naturally be able to modify it based on actual needs. Therefore, all equivalent changes and modifications made within the scope of the present invention are still covered by the patent.

Claims

1. A new type of carbon-sulfur based special compound fertilizer, characterized by: The novel carbon-sulfur-based special compound fertilizer is prepared by fully mixing wet ammonium sulfate and wet ammonium bicarbonate and then mechanically extruding and granulating them to recrystallize them to produce new carbon-sulfur-based ammonium salt crystals. The new carbon-sulfur-based ammonium salt crystals have stable chemical properties and high crystal particle strength.

2. A method for producing the novel carbon-sulfur based special compound fertilizer according to claim 1, characterized in that: The wet ammonium sulfate and wet ammonium bicarbonate by-products obtained from the ammonia desulfurization and carbon capture processes are fully mixed and recrystallized to produce new carbon-sulfur ammonium salt crystals. At the same time, nutrients such as phosphorus, potassium, magnesium, and calcium required by various crops are added and extruded into granules to produce a new type of carbon-sulfur based special compound fertilizer.

3. A method for producing the novel carbon-sulfur based special compound fertilizer according to claim 2, characterized in that: The novel carbon-sulfur-based special compound fertilizer has stable recrystallization chemical properties and high particle strength; the novel carbon-sulfur-based special compound fertilizer has significant synergistic effect and low cost.

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